Psychosocial Treatments For Premature Ejaculation Health And Social Care Essay

Premature interjection ( PE ) is a really common sexual disfunction among patients and changing prevalence estimations runing from 20 % down to 3 % . Premature interjection is characterized by interjection [ that ] ever or about ever occurs anterior to or within about 1 min of vaginal incursion ; inability to detain interjection on all or about all vaginal incursions ; and negative personal effects, such as hurt, bother, defeat and/or the turning away of sexual familiarity. Although psychological issues are present in most of the patients with premature PE, as a cause or as a effect, research on the effects of psychological attacks for PE has in general non been controlled or randomised and is missing in long-run followup.Aims ATo measure the efficaciousness of psychosocial intercessions for PE. To look into any differences in efficaciousness between different types of psychosocial interventions for PE. To compare psychosocial intercessions with pharmacological intervention and pharmacological intervention in association with psychosocial intervention for PE.Search methods ATests were searched in computerized general and specialised databases, such as: Medline by Pubmed ( 1966 to 2010 ) ; PsycINFO ( 1974 to 2010 ) ; EMBASE ( 1980 to 2010 ) ; LILACS ( 1982 to 2010 ) ; Cochrane Central Register of Controlled Trials ( Cochrane Library, 2010 ) ; and by look intoing bibliographies, and reaching makers and research workers.Choice standards ATests were eligible if they were Rrandomised or quasi-randomised controlled tests measuring psychosocial intercessions for PE. Surveies compared ingwith different psychosocial intercessions, pharmacological intercessions, waiting list, or no intervention for PE.Data aggregation and analysis AInformation on patients, intercessions, and results was extracted by at least two independent referees utilizing a standard signifier. The primary result step for comparing the effects of psychosocial intercessions to waiting list and standard medicines was betterment in IELT ( i.e. , clip from vaginal incursion to interjection ) . The secondary result was alteration in validated PE questionnaires.Consequences AOne survey ( De Carufel 2006 ) showed important betterments in continuance of intercourse ( MD:407.90 ; CI:302.42, 513.38 ) twosomes ‘ sexual satisfaction ( MD: -26.10 ; CI: -50.48, -1.72 ) and sexual map in favor of behavioural therapy ( BT ) compared with waiting list. This survey besides showed that a new Functional-sexological intervention ( FS ) was significantly better than waiting list for continuance of intercourse ( MD:412.00 ; CI:305.88- 518.12 ) , alteration over clip in subjective perceptual experience of continuance of intercourse ( Womans: MD:2.88 ; CI: 2.06, 3.70 ; Work force: MD:2.52 ; CI:1.65, 3.39 ) and twosomes ‘ sexual satisfaction ( MD -25.10 CI [ -47.95, -2.25 ) . One survey ( Li 2006 ) showed that the combination of Thorazine and BT was superior than chlorpromazine entirely related to the IELT ( MD:1.11 ; CI:0.82, 1.40 ) , SAS ( MD: -8.72 ; CI: -11.09, -6.35 ) and to some CIPE inquiries ( anxiousness in sexual activity, spouse sexual satisfaction, patient sexual satisfaction, control ejaculatory physiological reaction and ejaculatory latency ) . One survey ( Yuan 2008 ) showed that the direct comparing between BT and citalopram showed important difference in betterment of IELT ( Risk Ratio:0.52 ; CI:0.34, 0.78 ) and in the figure of twosomes satisfied with sex life after the intervention ( Risk Ratio: 0.60 ; CI:0.39, 0.93 ) in favor to drug therapy.Writers ‘ decisions AOverall, weak grounds shows that psychological intercessions are effectual in the intervention of PE. RandomisedA , controlled surveies of psychotherapeutics for PE are few, and the bulk has a little sample size. The early success studies ( 97,8 % ) of Masters and Johnson could non be replicated. One survey found a important betterment from baseline in the continuance of intercourse, sexual satisfaction and sexual map with new functional-sexological intervention and behaviour therapy compared to waiting list. One survey showed that the combination of Thorazine and BT was superior than Thorazine entirely. Randomised tests with larger group samples tests a re still needed to further research the current available grounds for psychological intercessions for handling PE.Plain linguistic communication sum-up APsychosocial intercessions for premature interjectionAPremature interjection ( PE ) is a really common ailment among work forces. Is characterized by interjection which ever or about ever occurs anterior to or within about one minute of vaginal incursion ; and inability to detain interjection on all or about all vaginal incursions ; and negative personal effects, such as hurt, bother, defeat and/or the turning away of sexual familiarity. Although psychological issues are present in most of the patients with PE, as a cause or as a effect, research on the effects of psychological attacks for PE is non clear. The early success studies ( 97.8 % ) of Masters and Johnson could non be replicated.This reappraisal assessed the efficaciousness of psychosocial intercessions for PE and found four tests that affecting 253 PE patients. Weak groun ds shows that psychological intercessions alone/or in combination with medicine are effectual in the intervention of PE.ABackground ADescription of the status APremature interjection is a really common sexual disfunction among patients and changing prevalence estimations runing from 20 % down to 3 % ( Simons 2001 ; Porst 2007 ; Jannini 2005 ; Althof 2010 ) . The prevalence rate depend on what definition were considered ( Althof 2010 ) . PE A is a ego defined status and there is no established diagnostic trial for this status, but at that place have A been many different definitions of PE ( Melnik 2009a ) . These definitions have been imprecise, subjective and missing an grounds base doing confusion as to what truly constitutes PE Intravaginal ejaculatory latency clip ( IELT ) is an nonsubjective ( timed ) step of the Until clip from vaginal incursion until interjection. It is one of the standard primary result steps in clinical tests of PE. Standards have been published that define any interjection happening in 1 min, 2 min, 3 min or even 7 min from incursion, or 8-15 penile pushs, as premature.A Alternatively, the European Association of Urology upsets of interjection guidelines, published in 2004, defined PE as the inability to command interjection for a â€Å" sufficient † length of clip before vaginal incursion ( McMahon 2008a ) . A population-based multicenter survey with 500 twosomes from five states: the Netherlands, United Kingdom, Spain, Turkey, and the United States utilizing a stop-watch during intercourse showed a average IELT of 5.4 proceedingss ( 0.55-44.1 proceedingss ) . This multicenter survey was conducted on a â€Å" normal † general male population, with no complains of PE ( Waldinger 2009 ) . Recently, the International Society for Sexual Medicine has proposed the following evidence-based definition: â€Å" Premature interjection is a male sexual disfunction characterized by interjection [ that ] ever or about ever occurs anterior to or within about 1 min of vaginal incursion ; inability to detain interjection on all or about all vaginal incursions ; and negative personal effects, such as hurt, bother, defeat and/or the turning away of sexual familiarity † ( McMahon 2008a ) . Subtypes of PE are defined harmonizing to their features and include womb-to-tomb versus acquired PE, planetary ( it occurs in all sexual brushs ) versus situational PE ( it happens in some state of affairss, with some spouses ) , and subtypes based on the accompaniment of other sexual jobs, peculiarly erectile disfunction ( Waldinger 2006a ; Waldinger 2006b ; APA 2000 ) . Time to blurt out is of import, but PE entirely based on IELT does non accurately qualify the status. PE is a multidimensional status and IELT entirely is non sufficient to qualify it. Other of import facets to include in the diagnosing include the patient ‘s subjective feeling of deficiency of control and the negative psychosocial effects of the status ( hurt ) A ( Jannini 2005 ; Porst 2007 ) , PE has a important consequence on the wellbeing of persons and on their sexual relationships ( McCabe 1970 ; Dunn 1999 ) . Work force with PE have reported reduced sexual assurance, trouble in set uping relationships and hurt at non fulfilling their spouses because of PE ( McMahon 2004, McMahon 2008b ; McMahon 2008c ; Symonds 2003 ; Rowland 2007 ; Patrick 2005 ) .Description of the intercession ACurrent schemes for PE therapy arise from both pharmacologic and psychological positions, reflecting restrictions in comprehension of the etiology of PE ( Melnik 2009a ) . The determiners of PE are doubtless complex, with differences between work forces with A A womb-to-tomb PE from work forces with acquired PE. Biogenic theories of PE have been multivariate at best, runing from psychosomatic manifestations of anxiousness or forming from early sexual experience to biologic accounts such as a hyperexcitable ejaculatory physiological reaction or disfunction of 5-hydroxytryptamine ( 5-HT ) receptor Waldinger 2008. Indeed, SSRIs, which modulate 5-HT signaling, have demonstrated efficaciousness in this scene and may be prescribed off-label to work forces with PE. Whether pharmacological agents such as dapoxetine or off-label clomipramine ( a TCA ) , paroxetine, Zoloft, and Prozac, or with day-to-day dosing of off-label paroxetine, clomipramine, Zoloft, Prozac, or citalopram should be encouraged as a first line intervention intercession ( Althof 2010 ) these medicines are a simple and, if non used for a life-time, cost effectual intervention for PE, there are some restrictions to their widespread usage. First, supplying a systemic drug for PE may be unneeded, given reasonably good results from psychosocial intercessions. Second, the serotonergic drugs have been associated with lessened desire, and in some instances, diminished rousing. Therefore, these drugs would non be recommended for patients who besides have low sexual desire or erectile disfunction. Third, they would non be recommended for patients with an undiagnosed bipolar upset, as they may significantly increase the likeliness of oncoming of a frenzied episode. Finally, are besides m inor side effects that accompany any drug usage, and these should be examined in footings of patient tolerance. Although psychological issues are present in most of the patients with PE, as a cause or as a effect, research on the effects of psychological attacks for PE is non clear The first publications on psychotherapeutics result surveies emphasized the psychological facets in the etiology of PE ( Althof 2007 ; Althof 2006 ; Kaplan 1974 ; Kaplan 1989 ) . The most normally proposed theories on the causality of PE, attribute it to a †conditioned physiological reaction † by which a form of speedy interjection is thought to go habituated. When onanism or sexual intercourse is repeatedly hurried, because of fright of find, anxiousness or guilt, †a rapid response may follow † . Based on this belief, in 1956, the urologist James Semans published behavioural intercessions for the direction of PE the â€Å" stop-start † technique ( Semans 1956 ) . Semans reported that 100 % of his patients utilizing the â€Å" stop-and-start † technique succeeded in commanding the minute of interjection. This method involves the spouse exciting the adult male ‘s phallus until he has the esthesis of about climaxing, at which clip stimulation is ceased until this feeling abates. The sequence may be repeated until the interjection can be controlled voluntarily ( Semans 1956 ) . With the grounds presently available, there are no informations back uping and retroflexing the old consequences reached by Semans, or even consensus account why this government may work. In the 1970ss, Masters and Johnson ( Masters 1970 ) , reported that after traveling through a two-week plan, 97.8 % of their clients presented remittal of PE. The â€Å" squeezing technique † proposed by them involves single and twosomes therapy, and requires the female spouse to squash the frenulum of the phallus for a few seconds one time the male has achieved â€Å" full hard-on † and begins to feel the impulse to blurt out. After the squeezing is released, a twosome must wait for approximately 30 seconds. This direction is followed until the male has delayed blurt outing for a period of 1520A proceedingss. Once the male learns to detain interjection, insertion ( and finally intercourse ) can be attempted utilizing the female superior place and she is instructed non to travel. The eventual end is for the male to develop sufficient control over his interjection to protract vaginal intercourse. The reported failure rates of 2.2 % instantly after intervention and 2.7 % at the five twelvemonth followup. Other research workers have been unable to retroflex Masters and Johnson ‘s success rates. Numerous minor changes to these two BASICs techniques have been suggested over the old ages by other sex research workers. Reccently the International Society for Sexual Medicine ( ISSM ) defines four chief psychotherapeutic intervention groups. These include: behavior therapy, particularly modified Masters and Johnson and Semans techniques, psycho instruction, psychodynamic therapy and cognitive behavioral therapy ( CBT ) ( Althof 2010 ) . The more normally examined psychotherapeuticss are derived from cognitive behavioral schools. These therapies are developed from cognitive therapy, which focuses on dysfunctional beliefs, and so incorporates constituents of behavioural psychotherapeutics, and its purpose is to rectify the negative deformed knowledges and dysfunctional underlying beliefs that maintain sexual disfunction. They include cognitive therapies, behavioral therapies, job work outing therapies and curative reading stuffs ( bibliotherapy ) . Numerous descriptive surveies hav e examined the proficient issues in accommodating these therapies to the clinical diverseness. Some of the more of import versions include stressing A behavioral techniques, peculiarly earlier in therapy and frequently reiterating information, utilizing different centripetal modes.How the intercession might work ASexually outcomes surveies must entree the complex interplay between the biological, emotional, psychological and relational constituents of persons and twosomes lives. Besides PE has been associated with anxiousness, depression, and hurt in work forces and their female spouses. Phamarcological intercession entrees portion of this complex â€Å" scenario † . Psychotherapy intercessions aims to alter dysfunctional feelings and attitudes and aid persons to develop to healthier, more effectual forms of behaviour. Harmonizing Althof 2002 A one of the lessons learned from the †Viagra revolution was that no affair how efficacious and safe the medical intercession, me dicines entirely could non ever overcome the psychosocial obstructions that maintained the disfunction and interfered with sexual life â€Å" . The premise behind psychosocial intercessions is that when patients learn about PE they begin to develop new sexual direction schemes to cover with restrictive sexual forms ; turning away of sexual activity ; and an involuntariness to discourse sex with a spouse ( Metz 1997 ) . The proposal is to: supply an empathic, supportive clinician-patient relationship, cut down or extinguish public presentation anxiousness, and assist him derive or recover sexual assurance ; alteration opposition to medical therapy, every bit good as to supervise topics ‘ clinical position and intervention response ; and modify his maladaptive sexual â€Å" books † ( Some signifiers of cognitive deformations ( e.g. generalisation of the sexual trouble, self observation during the sexual activity ) may interfere with sexual map. These issues need to be addressed during the psychotherapeutics procedure ( Althof 2006 ; Colpi 2004 ) . Some signifiers of cognitive deformation may interfere with sexual map that why is of import to supply didactic information and cut down the stigma associated with the premature interjection ( Althof 2006 ; Althof 2007 ) .Why it is of import to make this reappraisal AWork force with PE A study decreased sexual assurance, trouble in set uping relationships, and a negative impact on their quality of life. The consequence of PE on the person and the sexual relationship is important. On the other manus, the drug intervention offers benefits, but besides of import inauspicious effects which can impact its prescription A usage. So, a systematic reappraisal measuring the effects of psychological intercessions for PE seems seasonably.Aims ATo measure the efficaciousness of psychosocial interventions are effectual in the intervention of premature interjection. To look into if there are differences in efficaciousness between the different types of psychosocial intervention in PE. To compare psychosocial intercessions with pharmacological intervention and pharmacological intervention in association with psychosocial intervention on bettering on PE. To execute a meta-analytic synthesis of surveies, when possible.Methods AStandards for sing surveies for this reappraisal ATypes of surveies AAll published or unpublished randomised and quasi-randomised controlled tests measuring psychosocial intercessions for PE. Studies comparing psychosocial intercessions versus either pharmacological intercession or waiting list or no intercession or with another psychosocial intercession were eligible for this reappraisal.Types of participants APatients were included in this reappraisal if diagnosed with premature interjection, either defined by trialists harmonizing to DSM III ; IV ; IV-R, ICD or International Consensus standards. When tests failed to use diagnostic standards, the badness of PE was described by the usage of standardised evaluation graduated tables.Types of intercessions AExperimental intercessionsAny psychosocial intercessions that was A validated or described by the survey ‘s writer as being for premature interjection in tervention, as for illustration behaviour therapy, particularly modified Masters and Johnson and Semans techniques and psycho-education. Combined psychosocial intercessions were besides included in this reappraisal. In order to be eligible, a survey should include at least one group where merely some psychosocial intercession was given.Control InterventionsOther psychosocial intervention, placebo, non-intervention, pharmacological intervention and pharmacological intervention in association with psychosocial intervention.Types of result steps APrimary results AImprovement in IELT ( i.e. , clip from vaginal incursion to interjection, interjection latent clip ) ( McMahon 2008a ) Patient studies of betterment in control over interjection ( McMahon 2008a ) Patient ( and/or spouse ) studies of betterment in satisfaction with sexual intercourse ( McMahon 2008a )Secondary results AWhere informations were available, secondary results included: Chinese Index Premature Ejaculation ( CIPE ) – ego administered ( Yuan 2004 ) ; Change over clip in sexual satisfaction ( work forces and spouse are individually evaluated ) ; Sexual Interaction Inventory ( SII ) ( Hudson 1982 ) ; Satisfaction with Treatment Althof 2010 ; Self-rating Anxiety Scale ( SAS ) ( Zung 1971 ) ; Change over Time in Subjective Perception of Duration of Intercourse ( Scale 1 to 9 ) ; Change over Time in Objective Measure of Duration of Intercourse from Penetration to Ejaculation ( in Seconds ) .Search methods for designation of surveies A( ( â€Å" Ejaculation † [ Mesh ] ) or ( premature interjection ) or ( rapid interjection ) or ( ejaculatory upsets general pattern ) ( psychotherap* ) OR ( psychosocial intercession ) OR ( psychoeducation ) OR ( get bying accomplishments ) OR ( brief motivational guidance ) OR ( sexual therapy ) OR ( anxiety direction preparation ) OR ( matrimonial therapy ) OR ( group therapy ) OR ( cognitive therapy ) OR ( behavio* therapy ) OR ( focal therapy* ) OR ( general guidance ) OR ( psychodynamic therapy ) OR ( supportive therapy ) OR ( psychoanalyses ) OR ( interpersonal therapy ) OR ( cognitive therapy ) OR ( single therapy ) OR ( twosomes therapy ) OR ( waiting list ) ) ( â€Å" Counseling † [ Mesh ] ) or ( reding ) or ( Counselors ) or ( Counselor ) # 2 OR # 3 ( ( randomised controlled test [ platinum ] ) or ( controlled clinical test [ platinum ] ) or ( randomised [ tiab ] ) or ( placebo [ tiab ] ) or ( drug therapy [ sh ] ) or ( randomly [ tiab ] ) or ( test [ tiab ] ) or ( groups [ tiab ] ) ) non ( animate beings [ mh ] non ( worlds [ mh ] and animate beings [ mh ] ) ) # 1 AND # 4 AND # 5Electronic hunts A We searched the undermentioned databases: MEDLINE by Pubmed ( 1966 to 2009 ) ; PsycINFO ( 1974 to 2010 ) ; EMBASE ( 1980 to 2010 ) ; LILACS ( 1982 to 2010 ) ; Cochrane Central Register of Controlled Trials ( Cochrane Library, 2010 ) .Electronic hunts AWe searched the undermentioned databases: MEDLINE by Pubmed ( 1966 to 2009 ) ; PsycINFO ( 1974 to 2010 ) ; EMBASE ( 1980 to 2010 ) ; LILACS ( 1982 to 2010 ) ; Cochrane Central Register of Controlled Trials ( Cochrane Library, 2010 ) .Searching other resources ADesignation of all surveies via experts in the field, conference proceeding and personal communications. Handseaching of mentions notes of included surveies and relevant reappraisals. Unpublished studies, abstract and studies were considered for inclusion on the same footing as published studies. There were no limitations based on linguistic communication or day of the month. Handseaching the first publications of Archivess of Sexual Behavior, Journal of Sex & A ; Marital Therapy, and Journal of Sexual MedicineData aggregation and analysis AChoice of surveies ATwo referees ( TM and RR ) independently assessed ( blind to the determination made by each other ) the relevancy of each abstract produced by the hunt scheme. These were categorized into Relevant, Not relevant and Unsure. Articles of all relevant and diffident commendations were retrieved. Citations were read by each reappraisal writer ( blind to the determination made by each other ) utilizing pre-set standards and a entering sheet to place those included in the reappraisal. In instances of dissension, unfastened treatment took topographic point between all reappraisal writers and a determination was reached by consensus. Reasons for inclusion and exclusion were recorded.Data extraction and direction ADatas were being extracted from tests that met the inclusion standards. Data A included: inclusio n/exclusion standards ; method of randomization ; allotment privacy ; judge ‘s sightlessness ; sample size ; intention-to-treat Numberss ; figure and grounds for drop-outs ; age ; wellness position ; enlisting beginning ; initial tonss and standard divergence of all evaluation graduated tables applied ( including QoL ) ; diagnosing standards used ; length of test ; follow-up period ; length and frequence of Sessionss ; puting of therapy ; therapy type and theoretical account used ( i.e group or single therapy ) . For primary and secondary results, end point tonss and standard divergences from all evaluation graduated tables were extracted. In tests utilizing pharmacotherapy, the name of medicine, dose, frequence, side effects, and conformity were recorded. When informations were ill-defined or losing, matching writer was contacted.Appraisal of hazard of prejudice in included surveies AQuality appraisalThe methodological quality of the included tests in conformity to the Cochra ne Handbook for Systematic Reviews of Interventions ( Higgins 2008 ) . The ratings were compared and any incompatibilities between the reappraisal writers in the reading of inclusion standards and their significance to the selected tests were discussed and resolved. The undermentioned spheres were assessed as ‘Yes ‘ ( i.e. low hazard of prejudice ) , ‘Unclear ‘ ( unsure hazard of prejudice ) or ‘No ‘ ( i.e. high hazard of prejudice ) . The survey writer ( s ) were contacted to seek elucidation in instance of uncertainness over informations: Was the sequence coevals adequate? Was allotment adequately concealed? Was cognition of the allocated intercessions adequately prevented during the survey? Were uncomplete result informations adequately addressed? Are studies of the survey free of suggestion of selective result coverage? Was the survey seemingly free of other jobs that could set it at a high hazard of prejudice? These appraisals were reported for each person survey in the ‘Risk of prejudice in included surveies ‘ tabular array under the ‘Characteristics of included surveies ‘ , and jointly here: ‘Figure 30 ‘ , ‘Figure 31 ‘ .Measures of intervention consequence AFor uninterrupted informations, such as CIPE ( Chinese Index of Premature Ejaculation ) , the chief results of involvement was the alteration in mark from baseline to concluding appraisal. We used average difference ( MD ) with 95 % assurance interval ( CI ) . For dichotomous results, such as patient studies of betterment in control over interjection, the end point is of involvement, and the hazard ratio ( RR ) with 95 % CI were used to mensurate intervention consequence.Unit of measurement of analysis issues AFor tests comparing more than two intercession groups, the relevant intercession group was assessed. Couple, spouse and the patients themselves were besides considered.Covering with losing informations AFor dichotomous results, all exclusions/dropouts were identified. If no information available ( either from the study or the writers ) , it was assumed that dropout was due to intervention failure in conformity with ITT rules. The sensitiveness of the consequences to this premise were tested. For surveies utilizing uninterrupted results in which standard divergence ( SD ) was non reported, and no information was available from the survey writers, an SD was impute through obtaining the mean SD across surveies for intervention and control groups.Appraisal of heterogeneousness AStatistical heterogeneousness in the consequences of the tests was assessed diagrammatically and by the I2 statistic. An I2 of a†°? 50 % was considered considerable heterogeneousness, and we used the random-effects theoretical account. If I2 is & lt ; 50 % , we used a fixed-effect theoretical account. Possible grounds for clinical heterogeneousness were: 1.A A A the type of intercession offered ( single, twosome or group mode ) ; 2.A A A the badness of symptoms at baseline ( harmonizing with ego administered PE questionnaires ) ; 3.A A A the figure of psychological therapy Sessionss offered ; 4.A A A the proportion of participants being on medicine. Possible beginnings of heterogeneousness were assessed by sensitiveness and subgroup analyses as described above ( Higgins 2008 ) . Clinical heterogeneousness was explored by looking at separate subgroups of tests.Appraisal of describing prejudices AWe attempted to cut down publication and related prejudice ( PRB ) through the usage of alternate, robust hunt schemes, including handsearching Archivess of Sexual Behavior, Journal of Sex & A ; Marital Therapy, and Journal of Sexual Medicine. We were besides make usage of Internet hunt engines, conduct a comprehensive hunt of the gray literature, alternate beginnings of informations or synthesized grounds, A and contact experts in sexology research. Possible beginnings of coverage prejudices, which could be as publication prejudice, linguistic communication prejudice, commendation prejudice, hapless methodological quality, and heterogeneousness, and were analysed harmonizing to the surveies in inquiry.Data synthesis ADue to the intercessions and results heterogeneousness, it was non possible to pool the informations and to execute a meta-analysis.Dichotomous and uninterrupted informationsDichotomous results were pooled utilizing comparative hazards. For uninterrupted results, two methods will be used for pooling informations. Where all tests measured an result utilizing the same graduated tables and where the mean, standard divergence and sample size in each group were known, average differences ( MD ) were calculated. Where some of the tests measured results on different graduated tables and it will non see appropriate to straight unite informations from these steps, the standardized mean difference ( SMD ) was calculated. Both dichotomous and uninterrupted results were presented with 95 % assurance intervals.Subgroup analysis and probe of heterogeneousness AInitially was planned to execute subgroup analysis for subsets of participants ( such as individual versus holding a relationship ; immature versus aged ) , badness of PE ( mild, moderate, terrible ) , different psychotherapeutics technique ( single, twosome or group mode ) , figure of psychological therapy Sessionss offered, or drop-outs to research clinical heterogeneousness in the meta-analysis. Due to the little figure of included surveies and deficiency of available information sing these variables, merely different psychotherapeutics technique was considered for subgroup analysis.Sensitivity analysis ADue to the intercessions and results heterogeneousness, it was non possible to pool the informations and to execute sensitiveness analyses.Consequences ADescription of surveies ASee ‘Characteristics of included surveies ‘ , ‘Chara cteristics of excluded surveies ‘ .Consequences of the hunt AThe electronic and manual hunts resulted in 504 mentions, of which 487 were clearly non relevant to this reappraisal. Of the staying 17 mentions, 13 were excluded after reading the full documents.Included surveies AFour surveies affecting 253 PE patients met the inclusion standards and three of them were non-English surveies. There was full understanding on the inclusion of the five surveies for the reappraisal. Duration of included tests covered two hebdomads to twelve hebdomads. These tests included 253 male participants and 36 twosomes. Three tests compared psychotherapeutics techniques for PE versus pharmacological intercession and one compared the psychotherapeutics either with waiting list or functional-sexological intervention. These surveies were used to turn to the three aims outlined in the debut to this reappraisal.PutingAll surveies were conducted on an outpatient footing and were carried out in Canada ( n = 1 ) , China ( n = 2 ) and Egypt ( n = 1 ) .ParticipantsThe participants were consistent with the DSM-IV or DSM-III R diagnosing of PE and by the International Society of Sexual Medicine PE Criteria ( McMahon 2008 ) .InterventionsThe first aim was to find whether psychosocial interventions are effectual in handling PE and for this proposal merely one test was included. De Carufel 2006 evaluated the effects of a new functional-sexological ( FS ) intervention for PE. The intervention is intended to better control over the minute of interjection ; work forces larn how to command their rousing without holding to disrupt sexual activity. This intervention is based on the transition of sexual exhilaration through simple techniques: work forces are instructed to concentrate on the temporal, spacial and energetic dimensions of their motions, to utilize their musculuss in different ways ( for illustration, to loosen up the natess ) , to change theA velocity of sexual activity before and during intercourse, to take a breath from the stop, and to utilize places that require less muscular tenseness ( De Carufel 2006 ) . Treatment besides includes instruction on sensualness and information about the sexual responses of work forces and adult females. Study participants met the undermentioned choice standards: the adult male ‘s IELT was A less than two proc eedingss ; the twosome ‘s relationship was ongoing for at least one twelvemonth ; participants agreed to either take portion in hebdomadal meetings as a twosome or undergo a 12-week waiting list followed by a matrimonial intercession for the intervention of PE ; and participants presented with no major mental or physiological wellness jobs. Thirty-six A twosomes received one of three curative options: the new functional-sexological ( FS ) intervention ; a behavioural intervention ( BT ) including the squeezing and stop-start techniques ; or a 12-week waiting list ( WL ) . Participants provided an nonsubjective step of the continuance of intercourse from incursion to interjection. IELT was assessed prior to intervention, A during intervention and at follow-up. The consequences indicated that the FS intervention was really effectual and led to important betterments in the continuance of intercourse ( Figure 1 ) , sexual satisfaction ( Figure 18, Figure 19, Figure 21, Figure 24, Figure 27 ) and sexual map compared with the WL group. This comparing showed no difference sing the other results ( Figure 6, Figure 16, Figure 17, Figure 20, Figure 21, Figure 25, Figure 27, Figure 26 ) . The behavioural intervention obtained similar consequences compared with the FS therapy sing all results assessed ( Figure 8, Figure 9, Figure 10, Figure 7, Figure 12 ) . The comparing between BT versus WL showed better consequences in favor to BT group sing the undermentioned results: a ) continuance of intercourse from incursion to interjection ( Figure 1 ) ; B ) alteration over clip in subjective perceptual experience of continuance of intercourse ( Figure 14, Figure 15 ) ; c ) frequence of satisfaction for adult females ( Figure 23, analysis 5.7.1 ) ; vitamin D ) perceived pleasance for adult females ( Figure 23, analysis 5.7.4 ) ; vitamin E ) twosome ‘s sexual satisfaction ( Figure 24 ) .There was no difference between these intercessions sing sexual Interaction Invento ry Over Time – Work force ( Analysis 5.1 ) . The 2nd aim was to look into if efficacy differs between the different types of psychosocial intervention for PE. For this proposal, the merely included survey was the De Carrufel test which was described supra. This survey compared BT versus functional-sexological intervention. The 3rd aim was to compare the psychotherapeutics with the pharmacotherapy in patients with PE and three surveies fulfilled this demand: : Yuan 2008 indiscriminately allocated 96 patients with PE to one of three groups: behavioural therapy merely ( n = 32 ) ; citalopram ( a selective 5-hydroxytryptamine reuptake inhibitor ) merely ( n = 32 ) ; and a combination of citalopram and behavioural therapy ( n = 32 ) . The result steps were self reported IELT and both spouses satisfaction with their sexual life ( Yuan 2008 ) . After intercession, all three groups showed a important addition in the clip oversight before interjection. The direct comparing between citalopram-only versus BT-only favoured the citalopram group for the IELT ( Figure 5 ) and spouses sexual satisfaction ( Figure 28 ) .The comparing between combined attack versus citalopram-only favoured the combination group for both results ( .Figure 11, Figure 29 ) . The combined-approach group reported the highest sexual satisfaction, followed by the citalopram-only and behavioral-therapy-only groups. The writers concluded that the combined attack was an effectual in tervention for PE. In this survey, for statistical analysis, the conditions â€Å" satisfied † and â€Å" fundamentally satisfied † were classified as a alone group, therefore were non individually evaluated sing the result sexual satisfaction with sex life ( both spouses together ) . Fifty-one 2006 indiscriminately allocated 90 patients with PE to one of two groups: psychological intercession plus Thorazine ( n = 45 ) ; and chlorpromazine merely ( control group ; n = 45 ) . Chlorpromazine ( tri-cyclic antidepressant ) intervention comprised unwritten tablets ( 25 milligram ) taken twice daily for a sum of 6 hebdomads ; the intercession group besides received comprehensive behavioural psychotherapeutics. Each session of psychological intervention lasted at least 30 min, and Sessionss were given twice per hebdomad during this period. The result steps were tonss on the Chinese Index of Sexual Function for PE ( CIPE ) and IELT. CIPE scores for control of ejaculatory physiological reaction, sexual satisfaction of the patients and their spouses and anxiousness or depression about sexual activity were significantly better in the combined-intervention group than in the control group ( Figure 3 ) . The results IELT and SAS graduated table besides favoured the combined att ack ( Figure 2, Figure 4 ) . At follow-up, one month after intervention, the efficaciousness rates ( as IELT ) of the two groups were 82.9 % and 30 % , severally ( P & lt ; 0.01 ) ( Figure 13 ) . The writers concluded that a behavioural psychotherapeutics intercession enhanced the clinical efficaciousness of drug intervention for PE ( Melnik 2009 ) . Abdel-Hamid 2001 conducted a prospective, double-blind, randomised, crossing over survey of 31 patients with primary PE. Patients received one of four drugs administered on an as-needed footing 35 hours before awaited sexual intercourse ( clomipramine, Zoloft, paroxetine, Viagra ) or were instructed to utilize the pause-squeeze technique. The survey consisted of five 4-week periods of intervention, separated by 2-week washout periods. Anxiety mark and interjection latency clip were measured before intervention, after each intervention and during washout periods. Sexual satisfaction tonss were measured after each intervention. The three antidepressants ( clomipramine, Zoloft and paroxetine ) were tantamount in footings of efficaciousness and safety ( Abdel-Hamid 2001 ) . The pause-squeeze technique was associated with the lowest success rate ( 54.8 % ) compared with other modes. In add-on, the technique was associated with lower sexual satisfaction tonss and lower ejaculatory latency times in comparing with those achieved with Viagra and paroxetine, but the values were comparable to those achieved with clomipramine and Zoloft. For these patients with PE, Viagra showed the best consequences in footings of ejaculatory latency and satisfaction. This survey demonstrates besides that paroxetine is superior to the pause-squeeze technique in footings of ejaculatory latency and sexual satisfaction. It was non possible to pull out informations of this survey since the mean and standard divergence were non presented, merely the median. Besides that, the first writer declared that these informations were non available any longer. The 4th aim was determine whether psychosocial interventions were effectual for PE compared with drug therapy and for this, there were two surveies: Yuan 2008 and Abdel-Hamid 2001, which were described above.ResultsRating graduated tables included in this reappraisal: The Chinese Index of Premature Ejaculation ( CIPE ) is frequently used as a diagnostic tool.A It has five points that assess interjection clip from insertion, control of over IELT times, sexual satisfaction, spouse satisfaction and anxiousness and depression related to sex. Improvement in Ejaculation Latency Time ( IELT ) Patient studies of betterment in control over interjection ( McMahon 2008a ) Patient ( and/or spouse ) studies of betterment in satisfaction with sexual intercourse Change over Time in Subjective Perception of Duration of Intercourse Change over Time in Sexual Satisfaction Sexual Interaction Inventory over Time Satisfaction with Treatment Change over Time in Subjective Perception of Duration of Intercourse ( Scale of 1 to 9 ) Change over Time in Objective Measure of Duration of Intercourse from Penetration to Ejaculation ( in seconds )Excluded surveies ATwelve clinical tests were excluded ( despite being about intercessions for people with PE ) because they did non incorporate a control group. The surveies and the grounds for exclusions are presented in the ‘Characteristics of excluded surveies ‘ . Expecting appraisal There are no surveies expecting appraisal. Ongoing surveies We know of no on-going surveies.Hazard of prejudice in included surveies ADe Carufel 2006 and Abdel-Hamid 2001 were categorized as low hazard of prejudice. Fifty-one 2006 and Yuan 2008 were categorized as moderate hazard of prejudice. Of the four surveies included, all specified the method of randomization ( De Carufel 2006 ; Abdel-Hamid 2001 ; Yuan 2008 ; Li 2006 ) ( ‘Figure 31 ‘ ) .Allocation AAllotment was adequately concealed in two included tests ( Abdel-Hamid 2001 ; De Carufel 2006 ) and ill-defined in the other two ( Fifty-one 2006 ; Yuan 2008 ) ( ‘Figure 30 ‘ ) .Blinding APatient ‘s blinding was non considered applicable for psychosocial intercessions surveies. Consequently, the writers considered merely the judges blinding. Evaluator ‘s blinding was mentioned in merely two included tests ( Abdel-Hamid 2001 ; De Carufel 2006 ) ( ‘Figure 30 ‘ ) .Incomplete result informations AMerely one survey did no reference result information s ( Abdel-Hamid 2001 ) ( ‘Figure 30 ‘ ) .Selective coverage AMerely Li 2006 survey was considered free of selective coverage ( ‘Figure 30 ‘ ) .Other possible beginnings of prejudice AMerely Abdel-Hamid 2001 survey was considered free of other prejudice ( ‘Figure 30 ‘ ) .Effectss of intercessions AEffectss of intercessions are described in the Heading â€Å" Included Studies † , under the subheading ‘Interventions ‘ ( ‘Included surveies ‘ ) .Discussion ASummary of chief consequences AOne survey ( De Carufel 2006 ) showed important betterment in continuance of intercourse, twosomes ‘ sexual satisfaction and sexual map in favor of BT and a new Functional-sexological intervention ; compared with waiting list. One survey ( Li 2006 ) showed that the combination of Thorazine and BT was superior than chlorpromazine entirely related to the IELT, SAS and to CIPE. On survey ( Yuan 2008 ) showed that the direct comparing between BT and citalopram showed important difference in betterment of IELT in favor to drug therapy. The consequences of reviewed tests yield inconsistent and hapless decisions sing the effectivity of psychotherapeutics.Overall completeness and pertinence of grounds AIndeed, this was the first systematic reappraisals about psychosocial intercessions for PE. Besides, through this reappraisal, the writers performed a broad hunt including a manual hunt in the chief gender diaries, mentions of mentions and contact with the experts on the subject. Randomized, controlled surveies of psychotherapeutics for PE are few, and the bulk have a little sample size. One-half of the included surveies was considered as low hazard of prejudice and the other half, moderate hazard. The aims of this reappraisal were: ( a ) determine whether psychosocial interventions were effectual for PE against placebo ( waiting list ) , ( B ) to measure if there was a different consequence between the types of psychosocial intervention and ( degree Celsius ) to measure the function of psychological intercession in concurrence with pharmacological intervention for bettering PE and ( vitamin D ) determine whether psychosocial interventions were effectual for PE compared with drug therapy. The new functional-sexological intervention ( including the squeezing and stop-start techniques ) and the traditional BT led to important betterments in the continuance of intercourse, sexual satisfaction, and sexual map compared with baseline and with the control group ( waiting list ) , but no difference between them were found. Traditional BT is established technique in the literature for PE and the functional-sexological intervention did non add any betterment in the results. While a general consensus exists that psychotherapeutics confers extra benefits on patients who use pharmacological therapy for PE ( Althof 2006 ) few comparative, controlled surveies have investigated the benefits of psychotherapeutics in combination with medicine in the intervention of this upset ( Melnik 2009a ) . By contrast, recent articles support the efficaciousness of combined intervention over pharmacotherapy or psychotherapy entirely for the intervention of PE. Furthermore, these surveies besides indicate that combination therapy consequences in a decreased rate of intervention discontinuance and improved satisfaction with intervention one of the most of import results in gender research. Restrictions of surveies of combination therapy include deficiency of description of healer features ( for illustration, professional preparation ) and of psychological techniques used. Fifty-one 2006 test showed that the combination of clomipramine and BT was superior than clomipramine en tirely related to the IELT, SAS and to the undermentioned inquiries of the CIPE questionnaire: ejaculatory latency ( inquiry 4 ) , control of ejaculatory physiological reaction ( inquiry 5 ) , patient sexual satisfaction ( inquiry 6 ) , spouse ‘s sexual satisfaction ( inquiry 7 ) and patient ‘s anxiousness in sexual activity ( inquiry 10 ) . After 1-month follow-up the IELT was statistically higher in combined group. Yuan 2008 test showed that the combined attack ( citalopram plus BT ) was non statistically different from citalopram entirely related with the betterment of IELT neither with the couple satisfaction with sexual life. The direct comparing between BT and citalopram showed important difference in betterment of IELT in favour A of drug therapy. However, this test was classified as moderate prejudice hazard and was non clear if the BT was applied by a psychologist or by a doctor ( Yuan 2008 ) . The pause-squeeze technique was associated with lower success rate ( sexual satisfaction tonss and IELT ) compared with Viagra and paroxetine, but the values were comparable to those achieved with clomipramine and Zoloft ( Abdel-Hamid 2001 ) . Restrictions of the surveies include deficiency of randomised controlled tests, consequence sizes that are non clearly clinically important, validated outcome assessment instruments as survey end points, deficiency of obliging follow-up informations bespeaking care of intervention consequences, and deficiency of intervention manuals that allow reproduction.Quality of the grounds AOne-half of the included surveies were considered a low hazard of prejudice and the other half, moderate hazard.Potential prejudices in the reappraisal procedure AFor both Chinese tests, the first writers were contact for extra informations, but with no answer. In the Yuan 2008 and Li 2006 tests informations about the allotment privacy was non adequately described.Agreements and dissensions with other surveies or reappraisals AThere is merely old published systematic reappraisal ( Melnik 2009 ) . However this reappraisal was carried out in 2008, besides included quasi-randomised surveies and did non present quantitative information analysis.Writers ‘ decisions ADeductions for pattern AFor people- with PE: There is A weak grounds of the benefitsA of psychosocial intercessions in combination with pharmacologic therapyA for PE and psychosocial therapy entirely. For clinicians- Overall, small grounds ( most surveies that demonstrate efficaciousness are non controlled or randomised and have limited followup ) shows that psychological intercessions are effectual in the intervention of PE. Randomized, controlled surveies of psychotherapeutics for PE are few, and the bulk employ a little sample sizes. One survey found a important betterment from baseline in the continuance of intercourse, sexual satisfaction and sexual map with new functional-sexological intervention and behaviour therapy compared to waiting list. One survey showed that the combination of Thorazine and BT was superior than Thorazine entirely. For policy shapers: -There is a demand for farther research to analyze psychosocial intercessions for PE. For laminitiss: – Funders with an involvement in psychosocial intercessions for PE should back up further adequately powered, and designed surveies. In order to be able to believe about the cost deductions of PE wellness services research is needed into the long term results and quality of life impactDeductions for research AGiven the heterogeneousness of patients with PE, research is needed to better understand peculiarly for patients with womb-to-tomb PE and no antiphonal patients. An option would be planing intercessions that address these different clinical features instead than merely look intoing chief effects of psychosexual interventions, research should turn to specific interactions between patient features and intervention modes. Tests should to boot mensurate several other of import results, including phases of motive and preparedness to alter, including increased sexual assurance, sexual satisfaction, increased familiarity, patient and spouse satisfaction, operation, and health-related quality of life ( Althof 2006 ) . The current usage of validated questionnaires may surely lend to a better cognition of certain psychological issues, such as the sum of self-pride, anxiousness, and depressive feelings ( Melnik 2009 ) . Some issues remain undiscovered ( Waldinger 2008 ) . For illustration, which psychological fundamental law makes work forces more vulnerable to endure psychologically from short IELTs and what are the psychological features of work forces who perceive themselves as enduring from PE while holding objectively long IELTs? Randomized tests with larger group samples tests are still needed to further research the current available grounds for psychological intercessions for handling PE. The tests should be conducted over a longer follow-up period to farther look into delayed effects of psychological intercessions. Furthermore, the elucidation of the optimum dosage and continuance of any psychosocial intervention besides still needs farther probe ( Althof 2010 ) . The techniques used for randomization, sightlessness ( judges blind ) and allocation privacy should be described clearly in presentation of a survey. In add-on, all results should be presented in figures every bit clear as possible in a manner that readers can analyze the informations and draw decisions themselves ( Melnik 2009 ) .AAs psychosocial intercessions are used for people with PE, big, simple, well-designed and reported tests are justified to set up whether they are effectual. Randomized tests with larger group samples tests are still needed to further research the current available grounds for psychological intercessions for handling PE. The tests should be conducted over a longer follow-up period to farther look into delayed effects of psychological intercessions. Research workers may wish to look into further the intercessions included in this reappraisal in the ways suggested or to research other psychosocial intercessions for PE. Further surveies of psychosocial intercessions for PE should include clinically meaningful results such as: A important alterations in satisfaction with sexual/ affectional relationship, mental province, backsliding, A battle with services, quality of life, go forthing the survey early, satisfaction with attention, societal operation, inauspicious effects, and economic results ( cost-effectiveness and cost-benefit ) . Finally, ongoing researches to extricate what are the most effectual constituents in psychosexual therapy. Should output information that will help in the defining and ordination of future intervention programmes in sexual researchA in a mode that will enable the delivering of the most cost effectual intervention to as much of the population as possible.A A A ARecognitions ATo the Prostatic and Urological Cancer Diseases for back uping and redacting this reappraisal.Contributions of writers ATamara Melnik – chief referee, protocol and reappraisal development, appraisal of surveies, hazard prejudice appraisal, updating. Rachel Riera – protocol and reappraisal development, appraisal of surveies, hazard prejudice appraisal. Maria Eduarda Santos Puga – hunt schemes Sidney Glina – protocol and reappraisal development Alvaro Nagib Atallah – critical assessment of concluding version Stanley E. Althof – critical assessment of concluding versionDeclarations of involvement ANone declaredDifferences between protocol and reappraisal ADue to the intercessions and results heterogeneousness, it was non possible to pool the informations and to execute meta-analysis as antecedently planned at protocol phase.

Educational Measurement and Evaluation Essay

Educational evaluation started off as a branch of psychology in the late 50s, as a result of curriculum innovations. It was then referred to as Educational Measurement, Measurement and Evaluation or Test and Measurement. Within the last few decades, educational evaluation has grown into a separate, independent discipline, though with some leanings on the ideas of psychologists, psychometricians and statisticians. Efforts of educational evaluators have been directed specifically towards using precision, objectivity and mathematical vigour of psychological measurement in ways directly related to educational institutions, educational processes and purposes. Educational evaluation involves the systematic assessment of educational activities. Objects of evaluation include instructional programs, school initiatives and education goals. The growth in federal funding for education and policy-makers’ increased calls for school accountability have contributed to the growth of educational evaluation. Many large school districts have personnel responsible for evaluation activities. Definitions of Educational Evaluation Various ideas and definitions of educational evaluation are given by different people/researchers. According to Tuckman (1975) evaluation is a process wherein the parts, processes, or outcomes of a programme are examined to see whether they are satisfactory, particularly with reference to the stated objectives of the programme, our own expectations, or our own standards of excellence. According to Cronbach et al (1980) evaluation means the systematic examination of events occurring in and consequent on a contemporary programme. It is an examination conducted to assist in improving this programme and other programmes having the same general purpose. For Thorpe (1993) evaluation is the collection analysis and interpretation of information about training as part of a recognized process of judging its effectiveness, its efficiency and any other outcomes it may have. Measurement This is a broad term that refers to the systematic determination of outcomes or characteristics by means of some sort of assessment device. It is a systematic process of obtaining the quantified degree to which a trait or an attribute is present in an individual or object. In other words it is a systematic assignment of numerical values or figures to a trait or an attribute in a person or object. For instance what is the height of Uche? What is the weight of the meat? What is the length of the classroom? In education, the numerical value of scholastics ability, aptitude, achievement etc can be measured and obtained using instruments such as paper and pencil test. It means that the values of the attribute are translated into numbers by measurement. Principles of Educational Evaluation There are important factors to note which can serve as guides to educational evaluators in seeing to the effective planning and implementation of educational programmes, to yield the desired positive results. The classroom teacher or evaluator should always be perfectly clear in bis mind about what he is aiming to achieve i.e. what to evaluate and how to evaluate. Evaluation of educational programmes should be comprehensive i.e. assess pupils’ progress in all areas. Educational evaluation, apart from testing knowledge (Memorization), should also bring about pupils originality and use of ideas, and their ability to think and apply the knowledge and skills already learnt. It is noted here that evaluation as an integral part of the instructional process involves three steps. These are i. Identifying and defining the intended outcomes. ii. Constructing or selecting tests and other evaluation tools relevant to the specified outcomes, and iii. Using the evaluation results to improve learning and teaching. More so, evaluation is a continuous process. It is essential in all fields of teaching and learning activity where judgment needs to be made. All evaluation devices/instruments should be valid and reliable. They are valid when they measure what they aim to measure, and they are reliable when they produce consistent results over time. The teacher as an evaluator should be impartial as much as possible. He should try to avoid personal prejudices. All evaluation instruments should take into account the practical problems of administering and marking of the responses i.e. the instruments should be convenient to administer and clear to the pupils. The pupils’ responses should be easy to mark. Educational evaluation should be well planned in advance and should be carried out continuously, periodically and at least each term. Innovations Brought About in the Evaluation Technique of the Nigerian Educational System There are some faults that can be identified in the evaluation techniques used before, which through the efforts of the educational evaluators, have been corrected or perfected. The evaluation technique used before was the one-shot or final, end-of-term or year or session examination. This technique had served as a great ‘threat’ to the students, resulting in students’ cheating, memorizing notes and carrying out premature search for question papers in a bid to pass. Students who passed the end of the year examination through memorization are tagged brilliant while those who failed either as a result of initial problems or due to lack of proper guide are regarded as being dull. Efforts have greatly been made to see that students’ progress in school which has been neglected before is adequately monitored. The problems of the student in specific intellectual task which are not detected until late before are now easily detected. The one shot end-of-term examination technique which has been given undue publicity in schools, leading to tension in the students, have been greatly de-emphasized due to progressive monitoring of students’ achievement, during the term or session and the introduction of continuous assessment method. Great efforts are now been made by evaluators to de-emphasize consideration tor certificate only in job placement but to consider also the skill and interest of individuals in the job. In the previous evaluation technique used, the students’ assessment is usually not conducted in a systematic way. Assignments given to students are not always marked or graded. Students are given class test to keep them busy when the teacher is not around or when the lesson is not prepared for. The introduction of continuous assessment in all schools has had a tremendous impact in the gradual if not total elimination of these lapses. The use of diagnostic evaluation in determining the entry level or educational background of the pupils has helped considerably in checking various problems associated with mass admission of students. Previously, undue emphasis had been given to the cognitive achievement of the students at the expense of the affective and psychomotor domains. Now intensive efforts are in progress to evaluate the students in both. The educational evaluators are making tireless efforts to see to the complete eradication of all problems hi students’ assessment that can lead to examination malpractices. The Purpose of Measurement and Evaluation The main purposes of measurement and evaluation are: i. Placement of student, which involves bringing students appropriately in the learning sequence and classification or streaming of students according to ability or subjects. ii. Selecting the students for courses – general, professional, technical, commercial etc. iii. Certification: This helps to certify that a student has achieved a particular level of performance. iv. Stimulating learning: this can be motivation of the student or teacher, providing feedback, suggesting suitable practice etc. v. Improving teaching: by helping to review the effectiveness of teaching arrangements. vi. For research purposes. vii. For guidance and counseling services. viii. For modification of the curriculum purposes. ix. For the purpose of selecting students for employment x. For modification of teaching methods. xi. For the purposes of promotions to the student. xii. For reporting students progress to their parents. xiii. For the awards of scholarship and merit awards. xiv. For the admission of students into educational institutions. xv. For the maintenance of students. Educational evaluation provides adequate and effective feedback on students’ achievement not only in the cognitive area, but also hi the areas of interest and manipulative skill. It provides feed-back from students to the teacher about the effect of the teacher’s teaching method. It also provides feedback from the teachers to the parents about their ward’s performance. It provides feed-back from school administrators to the policy makers to determine the success of the programme. Continual educational evaluation provides valuable information about the pupils’ progress and comparison with other pupils in the class. Adequate educational evaluation also acts as an incentive to pupils’ studies. The test, examination and evaluation devices stimulate pupils’ interest and enable them to make, greater efforts. Without the use of evaluation devices, most pupils will not take their learning seriously. The use of such evaluation devices as observational techniques, assignments, continuous assessment and projects prevents one-short examinations which can lead to excessive memorization, cramming, unhealthy competition, and the complete neglect of other non-measurable aims of education. Educational evaluation provides pupils record of attainment which can be used for selection for further education, for placement into class or job, and for guidance and counselling purposes. Evaluation of pupils’ progress provides a valuable source material for educational research. Data on pupils’ achievements can help research workers and teachers to identify important educational problems in schools and provide solutions which will help in the improvement of the quality of education. Role of Agencies of Evaluation In Educational Development. Some of the agencies of educational evaluation in Nigeria are: West African Examination Council (WAEC), National Teachers Institute (NTI), National Business and Technical Examinations Board (NABTEM), Joint Admission and Matriculation Board (JAMB), Colleges of Education, Technical Colleges, Polytechnics and Universities. The government, through the Nigerian Educational Research Council (NERC) reforms the national educational policy and objectives, with the aim of designing new curricula for the various levels of the educational system. The West African Examination Council controls all forms of educational development and evaluation of the school certificate or general certificate ordinary and advance levels. WAEC is the curriculum planner, developer and evaluator. The teachers are the implementors. WAEC designs the syllabus for the various subjects offered at various levels of secondary education each year. It is on the syllabus that the teachers based their scheme of work, their specific objectives and their lesson plans. At the end of duration of the course WAEC organizes assessment examinations for school certificate and general certificate (OIL & A/L). It prepares a general time-table, appoint supervisors for the conduct of the examinations, and appoint experienced markers to mark the answer scripts, collate the marks, carry out the analysis of the results to determine the grade to which each student’s mark falls, In Nigeria, the WAEC result is the standard eligibility result, qualifying each candidate for further studies or for job selection and placement. National Teachers Institute: Â  Carries out similar functions as WAEC but is concerned with Teachers Grade II certificate only. Recently it has got involved in the Nigerian Certificate in Education (NCE) Sandwich programme. National Business and Technical Examination Board (NABTEM): The board conducts, assesses and controls all forms of examinations involving technical colleges and institutes of education throughout the nation. It has its headquarters in Benin. The function of the board is similar to that of WAEC. In addition to basic sciences, they also examine all subjects in technical education, social studies and English language. The result obtained here can be used for further studies or job placements. Joint Admission and Matriculation Board (JAMB): It represents the transitional agency from the secondary to the tertiary institutions such as the colleges of Education, Polytechnics and Universities. Its role is to set common entrance examination questions in all subjects, for all candidates seeking admission into higher institutions. Candidates with good passes in advance level papers or NCE are offered direct admission to the Universities of their choice. Conclusion and Recommendations In general, those practitioners in the educational system are most of the times interested in ascertaining the outputs of the educational programme. Output is counted in terms of test results which are naturally expressed in quantitative indices such as scores or marks. Test, which is a device, an instrument or a tool consisting of a set of tasks or questions, is used to obtain the results. Test can be in the form of pen and paper examination, assignments, practical etc. The process of administering this test is called testing. But an act of measurement is done when we award marks to an answer paper or assignment. So measurement gives the individual’s ability in numerical indices of scores i.e. measurement is quantitative. Assessment can be seen as the engine that drives and shapes learning, rather than simply an end of term examination that grades and reports performance. Evaluation is expressed in qualitative indices such as good, excellent pass or fail. Value judgment is therefore attached to the measurement. Evaluation can be placement, formative, diagnostic or summative REFERENCES Cronbach, L. J. (1960); Essentials of psychological testing (2nd edition), New York: Harper. Obimba, F.U. (1989); Fundamental of Measurement and Evaluation in Education and Psychology. Owerri, Totan Pub. Ltd. Paul, L. D. (1976); Handbook of Academic Evaluation. New York: McGraw-Hill. Ohuche, R.O. and Akeju, S.A. (1977); Testing and Evaluation in Education. Lagos: African Educational Resources (AER) STRAIDE Handbook (2002); Assessment and Evaluation in Distance Education. New Delhi: A Publication of Indira Gandhi National Open University (IGNOU). Tuchman, B.W. (1975); Measuring Educational Outcomes Fundamental of Testing. Atlanta: Harcourt Brace Jovanovich inc.

Apush Dbq American Revolution

Though some may try to argue that the American Revolution was not a real revolution since the upper class was not displaced, it was in fact a revolution because it transferred power from an entrenched British monarchy into the hands of local state legislatures. The American Revolution was representative of a great change which occurred in the way that in Britain, parliament viewed Americans as a small cluster of people who could be taxed without representation, to where in America the government was able to see how each individual could contribute to the economy, government, and the overall well-being of America.This idea came about from the increasingly more harsh and authoritarian taxes that were being placed on the colonies, without representation, from British monarchy. In reaction to the Tea Act, one of the taxes placed on imported goods to America, the New York Sons of Liberty wrote several resolutions to protest against it.These resolutions were signed by all different social classes, which signifies a change in society, because while in Britain only the wealthy and educated were permitted to participate in governmental choices, a very broad spectrum of society was able to be an active participant in how they wanted their government to be run. Although the lower class was not necessarily in congress, their ideas were able to represented by the people that they elected to express their ideas.Some who wish to argue the idea that the American Revolution was not a full revolution may bring into light the women of the revolution, and how there was not a huge change for them. Even though their was not an extremely significant change for them, American women were given a multitude of rights that were not given to women in Britain at the time. The women of America were able to go out to war with the men to protect them, and at times even take their place when a man was wounded and could not fulfill his duties on the battlefield.Additionally, they were often left in charge of the business and upholding of the household when their husbands went out to war. In summation, American women played many roles that were not typical of them in that time period; showing a revolutionary new way of thinking that involved women. After the surrender at Yorktown, a cartoon by James Gillray was made as a warning to the British that since they were able to defeat the British once, they could do it again should they try to overtake America and their freedoms again.While this act in itself was not a revolution, it was representative of the revolutionary ideas in the works of the United States of America. The American Revolution was the transference of power from a monarchial government to that of a representative democracy that was able to reflect the ideas and desires of all free white men of America; indicating that it was in actuality a revolution and not an expeditious rebellion.

Compare and contrast the movie and poem Howl Essay

Compare and contrast the movie and poem Howl - Essay Example In this essay, an attempt is being made to compare and contrast the poem ‘Howl’ against the film by the same name and analyze the contrasts and similarities found in both these media. The speaker explains in the first section of how he was a sad witness to the destruction caused to some of â€Å"the best minds† in the generation during which he lived, thereby reviving the Beatnik era once again. Following the riotous era of Rock and Roll, they were the first to initiate and disengage themselves from the orderly post-war years. Following them was the age of Hippies, Woodstock and the rest that came behind. (Roger Ebert, 2010) The young generation was primarily Ginsberg’s audience because they were able to identify themselves with it, since the poem was capable of touching the inner core of their being. A good example of this can be seen in the opening lines of the poem which says – However, ‘Howl’ the film evokes a more balanced and serious presentation with a more youthful Allen Ginsberg wearing a pair of horn-rimmed spectacles and does not look anything like the ‘angel-head hipster’ (Allen Ginsberg, 1955, p.1) destroyed by madness. Secretly, he did nurture a desire to be one, but somehow couldn’t bring himself to reveal the secret he had within his heart. However, in the film ‘Howl’, he reluctantly discloses that he did not wish to publish his poem, because he did not want his father to find out the secret, which was his homosexuality. Rob Epstein and Jeffrey Friedman, the writer- directors of the film ‘Howl’ took into account the new Beat scene with its smoky coffee- houses, where the reading of poetry was quite common. James Franco plays Ginsberg with due meticulousness and restraint and is shown in a 1955 coffee house reading the poem, as smoke envelops the audience, giving the scene a very authentic appeal. Another important

Tombstone Movie Review Example | Topics and Well Written Essays - 500 words

Tombstone - Movie Review Example This is seen as people are gunned down, death, and shot at open range. The film is cast in the form of a story. The film mainly focus on Wyatt Earp and the events that took place after the (Movie Guide, n.d.). This took place at the O.K. Corall in Arizona on October 26, 1881 (Movie Guide, n.d.). The film is characterized by a mediocre plot, bloody violence, and uneven cinematography. Analysis of the movie ‘Tombstone’ is of the essence in understanding plot, setting, directors, and cinematography. The analysis of the movie helps in gaining understanding of various aspects. The film is directed by George Cosmatos. The movie was cast in Hollywood and Cinergi pictures. Moreover, the movie is comprised of various characters. However, there are main characters that contribute to the plot of the story significantly. They include Kurt Russel, Van Kilmer, Michael Biehn, Powers Boothe, Dana Delany, Sam Elliot, Stephen Lang, Joanna Pacula, Bill Paxton, Bill Paxton, Jason Priestly, Michael Rooker, John Tenney, Doc Holliday, and Billy Zane (Movie Guide, n.d). In addition, the movie was made in 1993. This movie runs for 130 minutes. The movie is rated 7.7 out of ten points. The movie has an extensive plot. The movie begins with the retirement of Wyatt Earp (Kurt Russell) from law enforcement agency. Therefore, he engages in a journey and is accompanied by his brothers Virgil (Sam Elliot) and Morgan Bill Paxton (Holden, 2013).

Psychological Testing and Assessment Paper Essay

Psychological Testing and Assessment Paper - Essay Example Psychological test is one of the recognized measurement tools used in psychology. Cohen, Swerdlik and Sturnam (2013) define psychological test as devices and/or procedures used to measure psychological variables with regard to their effects on human life. Cohen, Swerdlik and Sturnam (2013) alternatively define psychological test process of determining psychology related variables through use of procedures and devices designed to produce a sample of behaviors. Counselors, and marriage as well as family therapists rely on psychological tests to accomplish their treatment goals of dysfunctional elements in their clients. Counselors need psychological tests such as interviews and observations to study behaviors and conducts of their clients. Interviews enable counselor to perform personality, intelligence, attitude, brain and behavioral tests on clients. Marriage and family therapists perform personality tests on related individuals facing difficult time to understand inherent motivators to act as they do. Personality tests enable counselors to weigh trust, confidence, courage, self-esteem, understanding, honesty and transparency between and among clients (Nichols, 2013). Measuring trust is usually important in marriage therapy where couples experience problem due to distrust. A married woman may use observations of behavioral change in the partner to suspect infidelity. If the two have not found time to talk about their challenges, the woma n would continue to express distrust in the marriage and behave in a manner that only escalates instability in the marriage. Marriage and family therapists also measure honesty levels in their clients to determine commitment of related members in their relationships. Honesty here, concerns open and truthful communication among members. Therapists understand dishonest communication have great propensity to lead to unstable relationship within families.

Impact ofUuninsured Population Essay Example | Topics and Well Written Essays - 1250 words

Impact ofUuninsured Population - Essay Example Health premiums alone rose threefold over average American incomes during the period 2000 - 04. This was largely the cause of 'under' insurance. A serious concern with Americans today is the possible fall out of being ill or injured in such circumstances. Most of the increase in the uninsured is due to an increase in the adult population to over 8 million equaled by a rise in the uninsured population to about 6 and a half million. About 4 million of this segment is below 200 percent of the poverty level. There are increases in uninsured even among the high income bracket of the population. Moreover, the shift in employment patterns suggests a large number veering toward employment in small size firms or self employment. Major figures for the uninsured or under insured are seen in this segment and most likely the trend will continue. The decline in employer sponsored health coverage will continue and costs of health insurance are far in excess of earnings and will continue to be so. Government intervention through public sponsored initiatives like tax credits or health programs is sure to be hampered by large budget deficits hampering state initiatives. In some states the growth in health care costs even outpaces state incomes. What are the implications in all this, fo... If the costs of health coverage are now being passed on to the individual, how do we widen the net to protect the underinsured and prevent the uninsured from drifting off into total hopelessness Suggested below are three initiatives can start and manage to face the risks from the uninsured population turning its back on us: Profit balanced with growth Product Mix Re-organize Structure (King, 2006) Profit balanced with growth drives the Business The issue - Economies of scale exist in the health care management industry but do not enable low premiums and ensure growth. Promotion of growth actually hampers profits as the issue concerning us is to be able to keep servicing our corporate clients, many of whom are offloading costs to each employee. We need aggressive double digit increases and pursue expansion of enrolments. Profits are important to us as they will help us survive a possible downturn caused by a low premium regime. Our goal would be achieve a premium yield of about 20% which would help us outpace the cost of expansion. This would come through our corporate clients It is suggested we that we prune down our client list to include those who would be able to share these costs. Ultimately, we would benefit from reducing the growing numbers of uninsured and passing off associated costs to those who can afford these. Degree of risk - Growth in enrollment would probably put us for a while in the path of unpredictable developments like rate of inclusion of new clinical technologies which would make costs spiral. This trend could be weathered by us as we have a mix of clients including those who came to us from other providers. This would be more preferable to the present trend of holding premium prices down in order to

European Union Law Bachelor Essay Example | Topics and Well Written Essays - 2000 words

European Union Law Bachelor - Essay Example Everyday, we checked on our television to know the latest news about our community, about stocks and investments, about movies and of what's happening all over the world. Since the first television broadcast in England in 1936, using a modern level of definition of more than 240 lines, new developments had been made including CableCARD , Digital television (DTV), Digital Video Recorders, Direct Broadcast Satellite TV (DBS), DVD, High Definition TV (HDTV) and many others. Through television, a lot of telecommunication companies has been put up which provides work for millions of people. It is where product commercials are aired. It is also where public concerns and responsibilities were discussed. While each and every national government has set up its own rules with regards to telecommunication, the European Union has also set its guidelines and policies to maintain and level the playing fields of the telecommunication competition. In this era where digital technologies were making its way to communication highways and prospectively play a much bigger role in the future, the European Union has identified the needs of introducing digital technologies harmoniously into the market. ... on Law in the light of the European courts of Luxenbourg considering the aims of competition law in the EU, and the history of European competition law. In this paper, the main elements of the European Union with regards to digital Television (DTV) and High Definition Television (HDTV) will be critically assessed. There are 6 different areas of audiovisual activities which are covered by the commission. According to the Principles and guidelines for the Community's audiovisual policy in the digital age (2005), On the basis of these principles, the Commission intends to take action in the following fields: cultural and linguistic diversity; the new "Media plus" programme, considered to be of crucial importance for the future of the European audiovisual industry. In all areas of action (training, development, distribution, promotion) this new programme will take account of the new digital environment. Research and development. The Fifth Framework Programme for Research and Development provides for a number of action lines of interest to the audiovisual sector. The external dimension of Community audiovisual policy will necessarily hinge around two central elements: the enlargement of the European Union and the new round of multilateral trade negotiations in the framework of the World Trade Organisation. The "Television without Frontiers "Directive This Directive which was adopted in 1989 and revised in 1997, based from Television broadcasting activities: "Television without Frontiers" (TVWF) Directive (2006) is the cornerstone of the European Union's audiovisual policy. Its two basic principles were: the free movement of European television programmes within the internal market; and the requirement that television channels, where practicable, reserve over half

King Saud University Essay Example | Topics and Well Written Essays - 3000 words

King Saud University - Essay Example They offer a complete free tuition in addition of providing scholarships to both the International and Saudi Arabia students. The university is situated in vast state of modern art campus in addition of being equipped with the modern technological instructions. For Internal audit to remain important to the King Saud University management then it must always adapt to the ever changing expectations of the seven universities in addition of maintaining alignment with the objectives of the university. There should be a systematic and a structured process for developing the internal audit strategic plan for the university; the strategic plan will include the following in addition to the mission and vision of the university; For the three years strategic plan, the initial step should be â€Å"Planning to plan† it should represent the necessary work before the beginning of primary planning process. The university internal management should agree on the efforts of overall strategic planning and the significant planning steps that will be undertaken. The university organization should also consider, evaluate and review the legislative/constitutional mandate since this will determine their future as well as daily academic business. The mission and vision of the university should also be its considerations before coming up with strategic planning. For the three years strategic planning, the university should identify its purpose and mandate of existence to avoid unnecessary conflict that might arise, which can also help in channeling a productive discussion and activity. The vision statement will make the university identify how it will appear in the future after successfully implemented its strategies as well as achieving its full potentiality. The three year strategic plan should also include a developed internal audit’s strategic vision. It should identify the responsibilities functional roles, mandates, stakeholders’ needs and

Computation finance Essay Example | Topics and Well Written Essays - 3000 words

Computation finance - Essay Example Creation of these dark pools has been possible because of existence of electronic trading and the fragmentation of avenues of conducting financial trading. The participants access them directly amongst themselves or through crossing networks. Dark pools are made up of three types, including where the independent entities create a distinctive and differentiated means of trading, those that are owned by brokers allowing the clients of the broker to trade amongst themselves in anonymity, and those created by the public exchanges themselves, meant to give their customers a chance to enjoy trading in anonymity and hiding of orders while trading. Hidden liquidity allows traders to ‘hide’ all or a part of their orders, which results into a market with two components – a displayed component and a non-displayed component. Hiding of orders, however, makes market participants to access incomplete knowledge regarding the market’s general depth. This paper is going to look at how these dark pools of liquidity work, why they are needed and their impact on the visible market. Most of the electronic exchanges that are order-driven use specific order types to provide liquidity such as what is referred to as ‘Iceberg Order’. An Iceberg Order is a passive order that is split into small portions, with partly or none of which is visible to the public. By concealing the actual quantity of the order, it is possible to tame price movements and reduce leakage of information, as well as any other flows that culminate from significant adjustments in the supply of stocks – this is called market impact. Splitting of orders is automated through order management systems, and it is a standard strategy used by many institutional investors.1 2 Companies are allowed to choose from three types of dark pools. The first include those owned by broker

IT Department BTEC Essay Example for Free

IT Department BTEC Essay Describe the various types of threats to organisations, systems and data P1 * Unauthorised access This category covers internal and external threats. Internal threats are things such as: Magic Disks A recovery or backup disk that has been modded to include viruses or key loggers. Man in the middle attacks People extracting sensitive and confidential information whilst posing to be a customer, or a legitimate company. Implanting Key loggers Applications designed to record key strokes and send them back to the hacker. External threats are this such as; Viruses Rouge applications designed to damage or make a system vunerable Trojans Applications designed to infiltrate a system often by posing to be a harmless file or embedded into another file. Piggybacking A term given to people who use someone elses internet connection without authorisation. This is often undertaken by logging onto an unsecured network without permission. Phishing Attempting to fool a user into believing you are a legitimate service attempting to gain sensitive information. Â  Damage to or destruction of systems or information. Damage to systems can occur when devices fail such as hard drives failing or natural disasters occurring in the workplace that could result in damaged or destroyed places. Such as: 1. Natural Disasters: This refers to what happens when data is lost as a result of natural disasters such as earth-quakes, floods, tsunamis, terrorists, fires and such. 2. Malicious Damage: This covers data that is lost, damaged, or stolen as a result of a hacker of some sort. A hacker can implant a virus onto a system in order to damage the system or simply steal data such as credit card data. 3. Technical Failure: Technical Failure covers when devices fail abruptly such a servers going down, power supply failing, hard-drives crashing ect. 4. Human Errors: is when someone makes a mistake which results in data being lost. Incidents such as people accidentally deleting files and pulling plugs and such. 5. Theft: Theft occurs when criminals gain access to an office building or other work environment and physically steal hardware and other entities that have a significant impact on the company (such as data). Â  Information security Information security refers to keeping sensitive data safe and confidential. An organisation would need to keep data complete, precise and up-to-date. Data such as bank details, blood types, addresses and other such information needs to be kept secure and confidential. Â  Threats related to e-commerce There are various security threats related to E-commerce. As websites that sell goods online rely solely on the availability and accessibility of an online store, they need to ensure the website is secure and not vulnerable to hackers. For example; Denial of Service attacks could prevent potential customers from purchasing goods and thus forth lose sales. Another example is website defacement which would also repel potential customers from buying online. There is also a threat of hackers implementing the man in the middle technique on behalf of particular online retailers which fools customers in believing the hacker is a legitimate worker of the website, this method could result in the hacker exploiting the customer and thus gaining the website a bad reputation. Â  Counterfeit goods Counterfeit goods effect creators, directors and artists as they cause a direct loss to potential income. Downloading counterfeit software, movies and music could result In a fine or lawsuit. Counterfeit goods are becoming increasingly popular as the ease of ripping DVDs, Music and Software makes it easier to access. Counterfeit goods may cause loss of business for companies. The loss of business then results in businesses having to raise prices to make up for loss of profit. Â  Organisational impact Security threats can cause loss or alteration of essential documents that the an organisation may need to function correctly. Loss of business followed by loss of income can also occur, this ultimately could result in bad reputation from potential customers. Systems going down could result in companies being unable to contact suppliers and customers. Circumstances of 4 security related threats on organisations p2 Phishing -This is the process of gaining information from someone by pretending to be a legitimate worker for a company and retrieving information for legitimate reasons. Phishing could result in customer details being leaked, distributed, and exploited. This could badly reflect on the company and lose the company business and income. Denial of Service Denial of Service is a process that involves a hacker overloading a server which results in the server being forced to shut down. This could result in loss of potential customers and thus profit. Piggybacking Piggybacking is the process of using a company internet connection without having authorisation to use it. This can severely effect bandwidth and damage company productivity. Piggybacking could result in systems lagging and becoming slow, this would result in workers being unable to do there job efficiently and at an optimised pace. There is also a threat posed by people using a companies network to browse illegal content to which the company would have to take responsibility. Man in the middle attack This is the process of being directly involved in communicating with both parties, claming to be one another. The outcome is both parties believe they are speaking to eachother, but they are actually talking to someone else. This method results in the man in the middle acquiring sensitive information such as credit card details from either party. This could result in the middle man leaking sensitive customer information such as customer addresses and more importantly; bank details. This could then result in the company getting a bad reputation or being taken to court for breaching data protection. The man in the middle could also waste company time and as a result; money. Countermeasures Implemented to reduce risk of damage to systems p3 p4 Countermeasures Vermason could implement to protect physical systems p3: CCTV This would work as both a visual deterrent to prevent thieves and vandals breaking into a building and causing damage or stealing systems and would also enable the company to keep an eye on potentially rouge employees that may steal data or embed viruses into systems. Sheilding Network Cables and Wirless Communications Data travelling via electro-magnetic or radio transmissions can be vulnerable to being remotely monitored because the copper data cable can be analysed to discover what data is travelling along the line. Fibre optic is the safest variation of network cabling and cables can be shielded to prevent data being tapped into. This would be a great countermeasure to prevent sensitive data from being leaked or exploited. Intrusion Detection Systems Systems such as proximity alarms can prevent burglars breaking into a building and can be set-up to call the police upon break-in. This works as both a deterrent; because warning potential burglars of alarms would prevent them from breaking in. And also as a countermeasure to attempt to catch anyone with malicious intent. Countermeasures Vermason could implement to protect network security p4: Backups Backups are an essential countermeasure in offices. If there was an electrical fire or other natural disaster that could result in loss of data, this would insure that all essential data such as databases the company requires to undertake work related tasks are still there aswell as contact, supplier and customer information so that they do not need to be re-acquired. Passwords Passworded systems can be implemented to secure individual workers within the company, it firstly provides an element of data security for each individual (eg; sensitive information that may be kept on a user account) and also holds each user responsible for there own actions on the computer under there own user account. More importantly; passwords ensure that only legitimate employees have access to important company files and other such potentially confidential information. Firewalls A firewall would prevent unauthorised access from outside the network. It does this by scanning data packets coming onto the computer and ensuring that they are safe, it also is responsible for actively preventing viruss such as Trojans being downloaded from the internet and onto the network computers. Installing a firewall would prevent hackers from accessing the network and stealing data or causing damage.

Adventures of Huckleberry Finn Style Analysis Essay Example for Free

Adventures of Huckleberry Finn Style Analysis Essay Macro: Plot:â€Å"Pretty soon he it was Miss Watson’s Jim! I bet I was glad to see him. I says: ‘Hello, Jim!’ and skipped out.† (Twain 40) â€Å"Who do you reckon ‘t is?† â€Å"I hain’t no idea. Who is it?† â€Å"It’s Tom Sawyer!† (Twain 203) Point of View: â€Å"It didn’t take me long to make up my mind that these liars warn’t no kings nor dukes, at all, but just low-down humbugs and frauds.† (Twain 115) â€Å"Well, I couldn’t see no advantage in going where she was going, so I made up my mind I wouldn’t try for it. † (Twain 6-7) Micro: Figurative Language: â€Å"I never see such an old ostrich for wanting to gobble everything and I a trusting you all the time, like you was my own father.† (Twain 189) â€Å"BOOM!† I see the white smoke squirt out of the ferry-boat’s side.† (Twain 36) Allusion:â€Å"ONe was â€Å"Pilgrim’s Progress,† about a man that left his family it didn’t say why.† (Twain 93) â€Å"Why, hain’t you ever read any books at all?† Baron Trenck, nor Casanova, nor Benvenuto Chel -getting a prisoner loose in such an old- maidy way as that? No;† (Twain 216) Imagery:â€Å"There was a clock in the middle of the mantel-piece, with a picture of a town painted on the bottom half of the glass front, and a round place in the middle of it for the sun, and you could see the pendulum swing behind it. It was beautiful to hear that clock tick.† (Twain 93) â€Å"and a streak of butter come a trickling down my forehead, and Aunt Sally she see it, and turns white as a sheet.† (Twain 245) Themes: In Mark Twain’s Adventures of Huckleberry FInn finding the truth yourself is wiser than believing what others tell you. In Adventures of Huckleberry Finn by Mark Twain he portrays how differences bring people closer together and make peace.

Fluid Catalytic Cracking Process Engineering Essay

Fluid Catalytic Cracking Process Engineering Essay INTRODUCTION Fluid catalytic cracking process, which is now more than 60 years old, is the cornerstone of most of the petroleum refineries. It has proven to be the most-efficient process available for the conversion of gas oils and residue into more valuable lighter hydrocarbons. Many refiners consider the catalytic cracking process to be the highest profit generating unit in the entire refinery. In earlier times, Fluid Catalytic Cracking Unit (FCCU) was operated broadly in two modes, they are; Maximum gasoline mode Maximum distillate mode But with the advent of Reformulated gasoline (RFG), these are now operated in maximum olefin mode. FCCU is a very sophisticated unit with many factors affecting each other and the overall process. In some processes investigation of factors impact is done by changing one factor at a time while keeping other factors constant. In case of FCCU it is almost practically impossible to obtain a clear indication; as, change in one single factor leads to change(s) in one or more other factors. This whole phenomenon is a natural consequence of the heat balance of FCCU. If the unit is to operate at steady state, then the unit has to be in heat balance condition. At this stage the heat requirement in the reactor is satisfied by burning coke in the regenerator and transferring the energy to the reactor through circulating hot catalyst. Heat balance around the reactor-regenerator can be used to predict the effects of process changes although the exact degree of the changes may be difficult to estab lish. It is one step at a time thought process and rather difficult to pin down exact numbers without a careful study of yields and coke laydown rates as affected by changing variables. In this work a plant data is taken as reference and based on that, calculations have been done to find out the net heat of endothermic reactions occurring in the riser reactor, assuming that the unit is operating at steady state and that the riser is an isothermal one. Then as per the products slate, a 7-lumped model is considered from various literatures and based on the kinetics of reactions, rate equations are formed and with the knowledge of available kinetic parameters the differential temperature drops along the height of the riser are calculated. PROCESS DESCRIPTION More than a dozen types of FCCU are operating worldwide. But the basic designs of all these type remain the same. FCCU comprises of two parts; Riser reactor, in which catalytic cracking reactions occur Regenerator, in which burning of coke (deposited during cracking) from the catalytic sites is done Figure 1 shows a schematic diagram of a typical FCCU. The feed is preheated in a furnace and (Figure: 1- Schematic Diagram of a typical FCCU) injected at the bottom of the riser along with a small amount of steam. This steam helps in dispersion of feed, good atomization and reduces coke formation by decreasing the partial pressure of hydrocarbon vapours. The feed is subsequently vaporized when it comes in contact with the hot catalyst from regenerator. The hydrocarbon vapours so formed undergo endothermic cracking reactions on their way up through the riser. The expansion of product vapours occurs through the length of the riser and the gas velocity increases with decreasing gas density. Hot catalyst particles provide the sensible heat and latent heat requirements for vaporizing the liquid feed and also endothermic heat of reaction for the cracking reactions. After a certain distance from the entry zone of the riser, the liquid feed is completely vaporized. Cracking reactions continue with the vapours moving up in the riser and the temperature is dropped along the length of the riser due to endothermic nature of cracking. The catalytic cracking is started and also completed in a very short period of time inside the riser reactor in which the catalyst is pushed upward by incorporating steam at various locations along the length of the riser and hydrocarbon vapours. Mixture of catalyst and hydrocarbon vapour travels up in the riser into the reactors. Steams injected at different locations in the riser are as follows, Fluffing steam at the bottom of the riser Dispersion steam along with fresh feed injectors Riser dilution steam above the fresh feed injectors Dispersion steam along with recycle stream injectors Aeration steam into the riser J bend to fluidize the catalyst Along with this some other locations are there where steam is injected. They are as follows; Spent catalyst standpipe aeration steam Regenerated catalyst standpipe aeration steam Reactor quench steam Reactor dome steam Post riser quench steam Stripping steam into strippers Mixture of catalyst and hydrocarbon vapour is discharged from the riser to the riser cyclone assembly. The bulk of the spent catalyst is separated from product vapours in the cyclone assembly. If necessary the vapours leaving the riser cyclones are routed into secondary cyclone assembly located inside the reactor vessel. Separated catalysts flow through each cyclone dip leg into the stripper. Product vapours leave the reactor cyclones and flow into the main fractionator through the reactor overhead vapour line. Quench steam is injected inside the reactor vessel to reduce the temperature, so as to minimize post riser thermal cracking reactions and coke formation. Reactor dome steam is provided to sweep hydrocarbons and avoid dead areas on top of the reactor vessel that may lead to thermal cracking and coking in that area. The separated catalyst from the riser and reactor cyclone assemblies enters the catalyst stripper. As the catalyst flows down the stripper, it gets stripped off the entrained hydrocarbon vapours by the up flowing steam. Stripping enhances the product recovery and reduces the carryover of hydrocarbon to the regenerator along with the spent catalyst thereof. Fluffing steam ensures the fluidization of the circulating catalyst. Stripped catalyst from the stripper flows into the regenerator dense bed through the spent catalyst standpipe (SCSP). Catalyst level in the stripper is maintained by spent catalyst slide valve (SCSV). Aeration steam is provided in the SCSP to ensure proper flow and fluidization of spent catalyst. Coke adsorbed on the spent catalyst during cracking reaction is been removed in the regenerator by burning off the coke with air. Air is supplied from the air blower to the regenerator through multiple distributors. Air is also introduced at different locations of the regenerator, they are as follows; T-grid air Regenerated catalyst standpipe (RCSP) hopper aeration air RCSP aeration air Regenerator fluffing air at the bottom near the J bend The regenerator can be operated in two modes; Partial combustion mode Complete combustion mode For partial combustion mode, a CO boiler is needed to convert CO to CO2. The current discussion is for complete combustion mode regenerator. Flue gas from the regenerated dense bed flows to the two stage regenerator cyclone assembly. Here the entrained catalyst is separated from the flue gas. The separated catalyst flows back to the dense bed through cyclone dip legs. Flue gas from the cyclone flows out from top of the regenerator through a flue gas line. Total air flow to the regenerator is regulated based on the desired level of oxygen in flue gas. Too low O2 concentration will cause coke build up on regenerated catalyst and CO release from regenerator. Too high O2 concentration will lead to regenerator cooling. So, regenerator flue gas is regularly examined for O2, CO, CO2, NO2, SO2 analysis. FEED CHARACTERIZATION The only constant in FCC operation is the frequent change in feedstock quality. Thats why two feeds with similar boiling point ranges can exhibit huge differences in cracking performance and product yields. Feed characterization is one of the most important activities in monitoring the FCC process. Feed characterization is the process of determining physical and chemical properties of the feed. Understanding feed properties and also knowing their impact on units performance is an essential thing. Trouble shooting, catalyst selection, unit optimization and subsequent process evaluation, all depend on feedstock. Feed characterization relates product yields and qualities to feed quality. Analytical techniques like mass spectrometry are sophisticated and not practical for determining complete composition of FCC feedstock. Simpler empirical correlations are often used. They are as follows; oAPI gravity and UOP K Boiling range Average boiling point Carbon residue Metals Sulphur, Nitrogen and Oxygen oAPI gravity and UOP K It is a specific gravity relating the density of oil to the density of water. The empirical formula for this is; oAPI 131.5 (3.1) Feed to an FCC can range from 15o to 45o API. If the API gravity increases the charge stock will crack more readily and for the same reaction temperature there will be greater conversion. Secondly at a constant conversion level, there will be greater gasoline yield with slightly lower octane. A rough indication of the quantities of paraffin present is a characterization factor which relates boiling point to specific gravity, is called the UOP K factor. This is given by; (3.2) Where: CABP = cubic average boiling point, oR SG = specific gravity at 60 oF Higher the UOP K value more is the paraffinic nature of the feedstock. Boiling Range The boiling range of FCC feed varies from an initial point of 500oF to an endpoint of about 1000oF. There are two boiling point ranges which are used to describe the lighter material in the feed. They are; Per cent over 430oF Per cent over 650oF The first quantifies the amount of gasoline in the feed. The second one quantifies the light fuel oil in the charge. Average boiling point Average boiling point of the FCC feed depends on the average molecular weight. An increase in average boiling point and molecular weight will typically cause the following; The charge will crack more readily, so at constant reactor temperature conversion will increase At constant conversion, yield of C4 and lighter will decrease Olefinic content of the product will decrease Regenerator temperature will tend to rise At constant conversion, the gasoline yield will increase about 1% for an increase in the molecular weight of 20. Carbon residue The carbon residue of a feedstock is an indirect measure of its coke producing nature. Values may be determined by either Conradson or Ramsbottom methods. The carbon residue can be a useful number for determining possible contamination in storage. Entrainment in vacuum tower is a common cause of increased carbon residue. Colour may be used to approximately evaluate the carbon content of the feedstock. Darker stocks tend to have higher carbon residues. Metals Organometallic compounds in the FCC feed can cause serious overcracking if the metals deposit on the catalyst. The cleanliness of a chargestock is given by a metals factor: Fm = Fe + V + 10 (Ni + Cu) (3.3) Where: Fm = Metals Factor Fe = Iron concentration V = Vanadium concentration Ni = Nickel concentration Cu = Copper concentration All metal concentrations are ppm by weight in the feed. A factor of 1.0 is considered safe, over 3.0 indicate a danger of poisoning of catalyst. Sulfur, Nitrogen, Oxygen Sulfur is as undesirable in FCC feed as it is in the feed to most of the refining units, causing corrosion of the equipment and increased difficulty in treating products. At 50% conversion about 35% sulfur charged is converted to H2S, and at 70% conversion the figure will rise to 50%. Nitrogen produces NH3 and CN- in the reactors, and NOx and trace quantities of NH3 in the regenerator. These NH3 and CN- cause plugging and corrosion, while the NOx and NH3 in the flue gas cause environmental problems. Gas oil will absorb oxygen in storage unless the tanks are gas blanketed. This oxygen will combine with the compounds in the oil at about 450oF to form gum, which fouls heat exchangers. FCC REACTION CHEMISTRY Cracking reactions are predominantly catalytic, but some non-selective thermal cracking reactions do take place. The two processes proceed via different chemistry. The occurrence of both the reactions is confirmed by distribution of products. Catalytic cracking proceeds mainly via carbenium ion intermediates. There are three dominant reactions in cracking are catalytic cracking, isomerization, hydrogen transfer. The idealized reaction classes are tabled below with specific reactions to support them. (Table: 1 idealized reactions of importance in FCCU) Reaction classes Specific reactions Cracking n-C10H22 n-C7H16 + C3H6 ; 1-C8H16 2C4H8 Hydrogen transfer 4C6H12 3C6H14 + C6H6 ; cyclo-C6H12 + 3 1-C5H10 3n-C5H12 + C6H6 Isomerization 1-C4H8 trans-2-C4H8 ; n-C6H10 iso-C4H10 ; o-C6H4(CH3)2 m- C6H4(CH3)2 Transalkylation C6H6 + m- C6H4(CH3)2 2C6H5CH3 Cyclization 1-C7H14 CH3-cyclo-C6H11 Dealkylation Iso-C3H7-C6H5 C6H6 + C3H6 Dehydrogenation n-C6H14 1-C6H12 + H2 Polymerization 3C2H4 1-C6H12 Paraffin alkylation 1-C4H8 + iso-C4H10 iso-C8H18 Some of the reactions are endothermic in nature and some are exothermic in nature. Each reaction has a heat of reaction associated with it. The overall heat of reaction is the combination of both the types of heat of reactions. Though there are a number of exothermic reactions, then also the net reaction is endothermic. It is apparent that the type and magnitude of reactions have an impact on the heat balance of the unit. If the catalyst is with less hydrogen transfer characteristics, it will cause the net heat of reaction to be more endothermic. This in turn results in higher catalyst circulation and possibly a higher coke yield to maintain the heat balance. FCC UNIT MATERIAL BALANCE For this, a complete set of commercial plant data is used. The data is given in subsequent tables below; FEEDSTOCK (Table: 2 Properties of feed components) Feed Unit Hydrotreated VGO Un-hydrotreated VGO Light Coker Naphtha Quantity,TMTPA 3200 800 170 % of total feed wt% 76.74 19.18 4.08 Density @ 15oC gm/cc 0.894 0.932 0.6762 CCR wt% 0.1 1.2 Sulfur wt% 0.1 3.32 0.434 Hydrogen content wt% 13 Ni + V wppm 1 6.38 Nitrogen wppm 500 1594 30 ASTM Distillation, vol.% D-1160, oC D-1160, oC D-86, oC IBP 366 349 36 5 374 379 10 385 394 43 30 420 435 49 50 443 468 57 70 485 508 65 90 545 556 75 95 576 573 FBP 620 609 86 Bromine no. 107.86 Paraffins vol.% 46.7 Olefins vol.% 43.38 Naphthenes vol.% 7.25 Aromatics vol.% 2.68 RON, clear 79.4 Diene value 5.31 WATSON K 12.436 MW 82.001 PRODUCT YIELDS (Table: 3- product yields, Ex-reactor and Perfect fractionator basis) Products wt % Weight (lbs. /hr.) H2S 0.39 4309 Hydrogen 0.041 606 Methane 1.06 11710 Ethane 1.54 17010 ethylene 1.76 19442 Dry gas 4.401 48768 Propane 2.86 31592 Propylene 9.66 106708 n-butane 1.69 18668 i-butane 5.52 60976 butenes 7.47 82516 LPG 27.2 300460 LCN 14.50 160174 MCN 23.40 257978 HCN 3.90 43082 LCO 16.45 181713 CLO 4.75 153347 COKE 5.01 - OPERATING CONDITIONS (Table: 4- Operating conditions for the Unit) Riser-Reactor Unit Value Fresh heavy feed rate (VGO) m3/hr. 533.4 Fresh light feed rate (Coker naphtha) m3/hr. 30.2 CLO recycle m3/hr. 46 Riser top temperature oC 540 Riser top pressure Kg/cm2 1.5 Feed preheat temperature oC 350 Regenerator Air to regenerator (dry basis) Nm3/hr. 310717 Regenerator pressure Kg/cm2 1.9 Dense bed temperature oC 640 Dilute bed temperature oC 654 Flue gas temperature oC 657 Blower discharge temperature oC 226 Stripper Stripping steam rate Kg/hr. 5000 Stripping steam temperature oC 290 Stripping steam pressure Kg/cm2 10.5 Base temperature oC 0 Ambient temperature oC 35 Flue gas composition MW= 30.6 O2 vol. % 2.49 CO vol. % 0.005 CO2 vol. % 15.58 N2 vol. % 81.83 SO2 vol. % 0.085 SO3 vol. % 0.01 Now using the above data, amount of oxygen that was consumed by burning the hydrogen in coke is estimated. All the gas calculations are based upon 100 moles of flue gas. The oxygen consumed for H2O is given by the expression; O2 consumed = * (vol. % of N2 in flue gas) 2 * (vol. % of O2 in flue gas) 2 * (vol. % of CO2 in flue gas) (vol. % of CO in flue gas) (5.1) So, O2 consumed = * (81.83) 2 * (2.49) 2 * (15.58) (0.005) = 7.36 The weight of the hydrogen and carbon in the coke are calculated; Weight = 2.016 * (7.36) + 12.01 * (15.58+0.005) = 202.01 The temperature differentials are calculated; (oF basis) ΆTRR = (Regenerator dense bed temperature Riser outlet temperature) (5.2) = 1184 1004 ΆTRR = 180 ΆTRB = (Regenerator fluegas temperature Blower discharge temperature) (5.3) = 1215 439 ΆTRB = 776 ΆTRS = (Riser outlet temperature Stripping steam temperature) (5.4) = 1004 554 ΆTRS = 450 The weight combined feed ratio is calculated as; (Flow rate)CLO * (Density)CLO * 2.204 CFR = (5.5) (Flow rate)Fresh feed * (density)fresh feed * 2.204 = CFR = 0.074 The stripping steam and inert gases carried to the reactor by the regenerated catalyst are calculated on a weight per pound fresh feed basis; Steam = (5.6) Steam = 0.01 Inert gases = (5.7) Inert gases = 0.007 The amount of hydrogen in the coke is calculated as; Hydrogen in Coke, wt % = [2.016 * 7.36 / 202.01] * 100 % = 7.35 wt. % The air to coke ratio is; Air to coke, wt/wt = (2897/202.01) * (81.83/79) Air to coke, wt/wt = 14.85 lbs air / lb coke Where; 2897 is the molecular weight of air multiplied by 100 (basis of 100 moles of flue gas) The weight of coke per hour may be calculated as; Weight of coke, lbs/hr. = (4591) * 193.23 / 14.85 = 59738.6 lbs/hr. Where; (310717 Nm3/hr. = 5178.62 Nm3/min. = 193.23 MSCFM 4591 = air rate conversion factor from MSCFM to lbs/hr.) So, weight % of coke is then; wt. % coke = * 100% = (59738.6 / 1104941.7) * 100 % wt. % coke = 5.41 In the product yield table, the coke wt. % is indicted as 5.01 wt%. But it is calculated as 5.41 wt. %. Now the overall weight balance is as follows; OVERALL WEIGHT BALANCE INPUT:- = Fresh feed + Coker naphtha + CLO recycle = {(533.4 * 0.8 * 894 * 2.204) + (533.4 * 0.2 * 932 * 2.204)} + (30.2 * 676.2 * 2.204) + (46 * 808 * 2.204) = 1186860.1 lbs. / hr. OUTPUT:- = Total product yields + coke = 1149831 + 59738.6 = 1209569.6 lbs. / hr. So, error in weight balance is calculated as; = INPUT OUTPUT = (1186860.1 1209596.6) lbs. / hr. = 22736.5 lbs. / hr. = 1.88 wt. % = 98.12 % closure Now combustion heat of coke is determined as follows; (at hottest temperature = flue gas temperature = 1215oF) ΆHcomb = [(X) (vol. % of CO in flue gas) + (Y) (vol. % of CO2 in flue gas) + (Z) (vol. % of O2 consumed)] / (weight if hydrogen and carbon in coke) (5.8) = [(48000) * (0.005) + (169743) * (15.58) + (106472) * (7.36)] / 202.01 ΆHcomb = 16971.8 Btu / lb coke Where; X = heat of combustion of CO at 1215oF Y = heat of combustion of CO2 at 1215oF Z = heat of combustion of H2O at 1215oF There is correction factor for the hydrogen in coke, this is given as; Correction factor, C = 1133 (134.6) (wt. % hydrogen) (5.9) = 1133 (134.6) (7.35) = 143.7 The net heat of combustion after using the correction factor is; -ΆHC = 16971.8 + 143.7 Btu / lb coke -ΆHC = 17115.5 Btu / lb coke At this point the reactor and regenerator heat balances are calculated. The catalyst supplies the heat to the reactor. The regenerator heat balance is calculated first using a basis of one pound of coke at the hottest regenerator temperature. The reactor heat balance is based on one pound of fresh feed. HEAT BALANCE REGENERATOR HEAT (Figure: 2- Regenerator heat In Out scheme) HEATREG = ΆHCOMB. ΆHCOKE ΆHAIR ΆHRADIATION LOSS (6.1) Now, ΆHCOKE = heat required to raise coke to combustion temperature = (0.4) * (ΆTRR) (6.2) ΆHAIR = heat required to raise air to combustion temperature = (lb air / lb coke) * (0.26) * (ΆTRB) (6.3) ΆHRADIATION LOSS = 250 Btu / lb coke So, HEATREG = 17115.5 {(0.4) * (180)} {(14.85) * (0.26) * (776)} 250 HEATREGHEATREG = 13797.4 Btu / lb coke -ΆHCSo, regenerator efficiency = *100% (6.4) = 80.6 REACTOR HEAT (Figure: 3- Reactor heat In Out scheme) HEATRX = ΆHFRESH FEED + ΆHRECYCLE + ΆHSTRIPPING STEAM + ΆHREACTION + ΆHRADIATION LOSS + ΆHINERTS (6.5) ΆHFRESH FEED, ΆHRECYCLE = heat required to raise fresh feed recycle to reactor temperature ΆHSTRIPPING STEAM = heat required to raise steam to reactor temperature = ΆTRS * (0.485) * (lb steam / lb fresh feed) (6.6) ΆHRADIATION LOSS = 2 Btu / lb fresh feed ΆHINERTS = heat of inert gases carried from regenerator to reactor by regenerated catalyst = ΆTRR * (-0.275) * (lb inerts / lb fresh feed) (6.7) HEATRX = (enthalpy of fresh feed at riser outlet temperature enthalpy of fresh feed at preheat temperature) + CFR (enthalpy of recycle feed at riser outlet temperature enthalpy of recycle feed) + ΆTRS * (0.485) * (lb steam / lb fresh feed) + 2 Btu / lb fresh feed + ΆTRR * (-0.275) * (lb inerts / lb fresh feed) + ΆHREACTION = (745 460) + 0.074 * (745 460) + 450 * (0.485) * 0.01 + 2 + 180 * (-0.275) * 0.007 + ΆHREACTION HEATRX = 310 + ΆHREACTION Note:- Enthalpies for the fresh feed and the recycle feed were calculated by taking respective UOP K values, oAPIs and the temperatures from the API technical data book. Regenerator heat is calculated on a one lb of coke basis. This can be converted to one lb of fresh feed by use of weight % of coke term. So, HEATRX = HEATREG () (6.8) ΆHREACTION + HEATRX = HEATREG () + ΆHREACTION (6.9) ΆHREACTION = HEATREG () + ΆHREACTION + HEATRX (6.10) But HEATRX = + ΆHREACTION Putting this relation in equation (6.10), the equation changes to ΆHREACTION = HEATREG () ΆHREACTION = 13797.4 * 310 ΆHREACTION = 436.44 Btu / lb fresh feed So, HEATRX = 310 + 436.44 HEATRX = 746.44 Btu / lb fresh feed (0.275) (ΆTRR)Cat / Oil (wt. / wt.) = HEATRX (6.11) Cat / Oil (wt. / wt.) = 15 lb Catalyst / lb Oil Catalyst circulation rate = (Cat / Oil) * (lb fresh feed / hr.) (6.12) = 15 * 1104941.8 CCR = 16574127 lbs. / hr. = 7524 MT/ hr. Overall heat flow scheme for the whole FCCU can be shown as below; (Figure: 4- Typical FCCU heat balance scheme) Now, the net total endothermic heat of reaction is calculated through empirical formulae. But we took the assumption as the riser is an isothermal one. Practically it is not isothermal. The temperature at the base of the riser is higher than what is at the top of the riser or at the riser outlet. This is because the cracking reactions occurring along the length of the riser is endothermic in nature. So heat is being absorbed during the reaction and causes the temperature at that particular location to decrease. Gradually the temperature decreases and at the riser outlet the temperature is dropped significantly. In this context we can estimate the riser base temperature using empirical relations and therefore can estimate the drop in temperature at the next differential element up in the riser [DNS]. But before this a multi-lumped model is to be considered along with possible reaction schemes and there kinetic parameters. SEVEN LUMP KINETIC MODEL For this purpose a seven lump kinetic model proposed by Mehran Heydari et al. (2010) is used. They divided the model into seven lumps namely; VGO/Coker Naphtha, Clarified Oil, Light Cycle Oil, gasoline (LCN, MCN, and HCN), LPG, Dry gas and Coke. The schematic flow diagram is as follows; (Figure: 5- Seven lump kinetic model in FCCU) In order to develop a mathematical model for this particular system, certain assumptions has to be taken, they are as follows; The riser is an one dimensional ideal plug flow reactor with no radial and axial dispersion Reactor is an adiabatic riser Feed viscosity and heat capacities of all components are constant Fluid flow is not affected by the coke deposition on the catalyst Feed is vaporized instantaneously in the riser entrance All cracking reactions are taking place in the riser The model considers seven lumps and eighteen reactions and eighteen kinetic constants. Molecular weights of different lumps and boiling ranges are given [DNS] in the table below; (Table: 5- molecular weights and boiling ranges of lumps) j Lump Molecular weight (Kg/ Kmol) Boiling range (oC) 1 VGO 418.7 349 620 2 CLO 291 232 -567 3 LCO 226 170 392 4 GASOLINE 114 30 228 5 LPG 65 6 DRY GAS 30 7 COKE 12 Values of kinetic constants and activation energies along with heat of reactions for each reaction are given in the table below ([DNS], [Mehran Heydari], [Praveen ch. shishir sinha]); (Table: 6- reaction schemes with kinetic parameters) Reactions Rate constants (m3/ kg cat. hr.) Activation energy (KJ/Kmol) Heat of reaction (KJ/Kg) VGO CLO 14.93 50.73 45.821 VGO LCO 5.78 50.73 79.213 VGO GASOLINE 11.69 50.73 92.335 VGO LPG 3.59 16.15 159.315 VGO DRYGAS 0.35 16.15 159.315 VGO COKE 11.55 16.15 159.315 CLO LCO 5.78 50.73 56.314 CLO GASOLINE 0.94 46.24 128.571 CLO LPG 0.135 59.75 455.185 CLO DRYGAS 0.0135 59.75 455.185 CLO COKE 0.3272 59.75 455.185 LCO GASOLINE 0.5742 46.24 93.030 LCO LPG 0.0086 59.75 704.93 LCO DRYGAS 0.0009 59.75 704.93 LCO COKE 0.0596 59.75 704.93 GASOLINE LPG 0.0003 78.49 372.10 GASO DRYGAS 0.0001 78.49 372.10 LPG DRYGAS 0.0033 59.75 32.30 The riser model is assumed to be a two phase model