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Performance evaluation of Siemens E.Cam® Spect System at Korle-Bu Teaching Hospital (Ghana 西门子E.Cam®Spect系统在加纳Korle-Bu教学医院的性能评估
British Journal of Applied Science and Technology Pub Date : 2011-03-25 DOI: 10.4314/JAST.V16I1-2.64789
E. Sosu, F. Hasford, J. Amuasi
{"title":"Performance evaluation of Siemens E.Cam® Spect System at Korle-Bu Teaching Hospital (Ghana","authors":"E. Sosu, F. Hasford, J. Amuasi","doi":"10.4314/JAST.V16I1-2.64789","DOIUrl":"https://doi.org/10.4314/JAST.V16I1-2.64789","url":null,"abstract":"Performance evaluation tests on Siemens e.camR Signature Series Single Photon Emission Computed Tomogra-phy (SPECT) System at Korle-Bu Teaching Hospital (Ghana) were conducted for compliance with Manufactur-erfs specifications and usersf requirements. The tests were performed according to National Electrical Manufac-turers Association protocols, and different measuring instruments and phantoms containing 99m-Tc were used. Extrinsic uniformity, System energy resolution, System spatial resolution (without scattering), Detector shield leakage and System planar sensitivity were evaluated. The System energy resolution measured was 9.38 % as against manufacturersf specification of . 9.9 %, Planar sensitivity value measured was 232.92 c/min/mCi while manufacturersf specification was 202 c/min/mCi, and Detector shield leakage values measured were 0.001 %, 0.022 % and 0.025 % against an accepted value of < 1 %. The performance evaluation confirmed that the Syst-em met requirements for clinical nuclear medicine imaging, and the values could be used as database for future quality control measurements.","PeriodicalId":9207,"journal":{"name":"British Journal of Applied Science and Technology","volume":"39 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2011-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86665472","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Predicting critical heat flux in slug flow regime of uniformly heated vertical channel using coolant and geometric parameters 利用冷却剂和几何参数预测均匀加热垂直通道段塞流态的临界热流密度
British Journal of Applied Science and Technology Pub Date : 2011-03-25 DOI: 10.4314/JAST.V16I1-2.64775
Vincent Yao Agbodemegbe, E. Akaho, A. Ayensu, E. Alhassan, C. Bansah, N. Adoo
{"title":"Predicting critical heat flux in slug flow regime of uniformly heated vertical channel using coolant and geometric parameters","authors":"Vincent Yao Agbodemegbe, E. Akaho, A. Ayensu, E. Alhassan, C. Bansah, N. Adoo","doi":"10.4314/JAST.V16I1-2.64775","DOIUrl":"https://doi.org/10.4314/JAST.V16I1-2.64775","url":null,"abstract":"Numerical computation code (PWR-DNBP) has been developed to predict Critical Heat Flux (CHF) of forced convective flow of water in a vertical heated channel. The code was based on the liquid sub-layer model, with the assumption that CHF occurred when the liquid film thickness between the heated surface and vapour in the slug flow regime attained critical film thickness of infinitesimally small value at positive liquid velocities for which the value of critical heat flux ratio (CHFR) ~ 1. The numerical simulations predicted trends that CHF decreased with increasing flow quality, increased with increasing coolant mass flux, and increased with channel diameter. The predicted CHF were validated with data obtained by Tong’s correlation, and the computational errors indicated deviations of 5 -10 % uncertainty levels.","PeriodicalId":9207,"journal":{"name":"British Journal of Applied Science and Technology","volume":"21 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2011-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88702836","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Impulse breakdown of small air gap in electric field Part I: Influence of barrier position 电场中小气隙的脉冲击穿第一部分:障位的影响
British Journal of Applied Science and Technology Pub Date : 2011-03-25 DOI: 10.4314/JAST.V16I1-2.64780
J. Afa
{"title":"Impulse breakdown of small air gap in electric field Part I: Influence of barrier position","authors":"J. Afa","doi":"10.4314/JAST.V16I1-2.64780","DOIUrl":"https://doi.org/10.4314/JAST.V16I1-2.64780","url":null,"abstract":"The influence of barrier position on breakdown voltage in air dielectric has been investigated. Needle and Cone positive point electrodes were used and the effects of electrode curvature on barrier position for maximum breakdown voltage were compared, with air gap for the point to plane electrode fixed at 10 cm for all the tests. The breakdown probability was found for barrier position, and at every barrier distance, the breakdown voltage differed. The position for maximum breakdown for needle electrode was in the range of 28 - 30 % from the poi-nt electrode. The position for optimum breakdown for cone electrode was 50 % from the point electrode, and the deviation originated from the electrode configuration. The effect of defective barrier was tested by introducing holes of different diameter at the barrier centre, and the maximum breakdown voltage was affected depending upon the diameter of the hole on the barrier.","PeriodicalId":9207,"journal":{"name":"British Journal of Applied Science and Technology","volume":"24 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2011-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86805287","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
FINITE ELEMENT STRESS ANALYSIS OF BRICK-MORTAR MASONRY UNDER COMPRESSION 砖砂浆砌体受压受力有限元分析
British Journal of Applied Science and Technology Pub Date : 2011-03-25 DOI: 10.4314/JAST.V16I1-2.64776
T. Nwofor
{"title":"FINITE ELEMENT STRESS ANALYSIS OF BRICK-MORTAR MASONRY UNDER COMPRESSION","authors":"T. Nwofor","doi":"10.4314/JAST.V16I1-2.64776","DOIUrl":"https://doi.org/10.4314/JAST.V16I1-2.64776","url":null,"abstract":"Stress analysis of a brick-mortar couplet as a substitute for brick wall structure has been performed by finite element method, and algorithm for determining the element stiffness matrix for a plane stress problem using the displacement approach was developed. The nodal displacements were derived for the stress in each element, fr-om which the general stress configuration for the structural model was evaluated. The process involved numeri-cal computation and the results showed that the stresses were directly affected by the modulus of elasticity of the mortar, assuming that the modulus of elasticity for the brick region remained constant. The limitation of fai-lure theory based on homogeneity was not ignored, as variation of modulus of elasticity for the mortar region was a significant factor.","PeriodicalId":9207,"journal":{"name":"British Journal of Applied Science and Technology","volume":"12 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2011-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75041264","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Homogeneous and heterogeneous catalysis production and evaluation of bio-diesel from Jatropha, neem and rubber seeds 麻疯树、楝树和橡胶种子均相和多相催化生产生物柴油及评价
British Journal of Applied Science and Technology Pub Date : 2011-03-25 DOI: 10.4314/JAST.V16I1-2.64788
C. S. Ezeanayanso, E. Agbaji, V. Ajibola, E. Okonkwo
{"title":"Homogeneous and heterogeneous catalysis production and evaluation of bio-diesel from Jatropha, neem and rubber seeds","authors":"C. S. Ezeanayanso, E. Agbaji, V. Ajibola, E. Okonkwo","doi":"10.4314/JAST.V16I1-2.64788","DOIUrl":"https://doi.org/10.4314/JAST.V16I1-2.64788","url":null,"abstract":"Optimization of process parameters for producing biodiesel from Jatropha carcus, Azadirachta indica and hevea brasiliensis seed oils using homogeneous and heterogeneous catalyst were investigated. Temperature and methanol characteristics (oil molar ratio; catalyst type, concentration and agitation) controlled the ester convers-ion. A single-step and two-step trans-esterification were used to produce biodiesel from free fatty acid rubber, jatropha and neem seed oils. The maximum yields of ester from jatropha, neem and rubber oils were respective-ly 98.4, 94.6 and 92.8 % by homogeneous catalysis, and 79.0, 72.0 and 70.2 % by heterogeneous catalysis. While the homogeneous catalysis route produced higher biodiesel yields, the heterogeneous catalyst method produced biodiesel of lower ester content. The fuel properties of biodiesels and blends were analysed quantitati-vely, and the biodiesel produced by homogeneous catalysis compared favourably with conventional diesel fuel.","PeriodicalId":9207,"journal":{"name":"British Journal of Applied Science and Technology","volume":"9 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2011-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77242204","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Renewed interest in Direct Current (DC) transmission 对直流(DC)传输的新兴趣
British Journal of Applied Science and Technology Pub Date : 2011-03-25 DOI: 10.4314/JAST.V16I1-2.64794
A. Charles
{"title":"Renewed interest in Direct Current (DC) transmission","authors":"A. Charles","doi":"10.4314/JAST.V16I1-2.64794","DOIUrl":"https://doi.org/10.4314/JAST.V16I1-2.64794","url":null,"abstract":"","PeriodicalId":9207,"journal":{"name":"British Journal of Applied Science and Technology","volume":"37 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2011-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90925104","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Estimating head and frictional losses through pipe fittings in building water distribution systems 建筑配水系统中通过管件估算水头和摩擦损失
British Journal of Applied Science and Technology Pub Date : 2011-03-25 DOI: 10.4314/JAST.V16I1-2.64782
J. Sodiki, S. Orupabo
{"title":"Estimating head and frictional losses through pipe fittings in building water distribution systems","authors":"J. Sodiki, S. Orupabo","doi":"10.4314/JAST.V16I1-2.64782","DOIUrl":"https://doi.org/10.4314/JAST.V16I1-2.64782","url":null,"abstract":"By extending pipe length by equal increments, with corresponding increments in number of sanitary appliances and total water flow rates to a water distribution system of a building, fractions of the total frictional loss throu-gh pipe fittings for varying work complexities were obtained. The fractions varied from 0.342 to 0.377 as the pipe length increased from 28.3 m to 68.3 m with corresponding increase in number of appliances from 8 to 48 and total water flow rate from 0.60 L/s to 2.24 L/s. The fractions were applied for quick estimation of head los-ses in building water distribution networks.","PeriodicalId":9207,"journal":{"name":"British Journal of Applied Science and Technology","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2011-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79823760","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Chemical analysis of Agbabu Bitumen Exudate as potential refinery feedstock 阿巴布沥青渗出液作为潜在炼油原料的化学分析
British Journal of Applied Science and Technology Pub Date : 2011-03-25 DOI: 10.4314/JAST.V16I1-2.64785
H. Ogunsuyi, O. Ajayi, T. Abayomi
{"title":"Chemical analysis of Agbabu Bitumen Exudate as potential refinery feedstock","authors":"H. Ogunsuyi, O. Ajayi, T. Abayomi","doi":"10.4314/JAST.V16I1-2.64785","DOIUrl":"https://doi.org/10.4314/JAST.V16I1-2.64785","url":null,"abstract":"Maltene fractions of Agbabu bitumen exudate analysed by Gas Chromatography-Mass Spectrometery revealed that the chemical compositions were similar to compounds of conventional petroleum. Specifically, saturated hydrocarbons (alkanes), alicyclic hydrocarbon (cycloparaffin), unsaturated hydrocarbons (alkenes), aromatic hy-drocarbons and nitrogen, sulphur and oxygen (NSO) compounds, which are the notable constituents of petrole-um, were all identified in the exudate. The proportions of the constituents in the bitumen were 44.59 % cyclop-araffin, 28.61 % alkanes, 3.47 % monoaromatic hydrocarbons, 6.44 % alkenes, 3.23 % nitrogen compounds, 1.95 % sulphur compounds and 4.27 % oxygen compounds. The composition compared favourably to the resp-ective percent ranges in conventional crude oil, i.e. normal alkanes (15 - 60 %), cycloparaffins (30 - 60 %), aro-matics (3 - 30 %), nitrogen (1 - 2 %), oxygen (0.1 - 1.5 %), sulphur (0.2 - 0.5 %). However, the percentage co-mposition of the NSO compounds was higher than found in conventional petroleum. To serve as refinery feed-stock, the exudate must be subjected to hydrogenation to remove the polar (NSO) compounds.","PeriodicalId":9207,"journal":{"name":"British Journal of Applied Science and Technology","volume":"139 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2011-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86149748","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Cost-benefit analysis of hybrid wind-solar power generation by homer power optimization software 利用homer功率优化软件进行风光互补发电的成本效益分析
British Journal of Applied Science and Technology Pub Date : 2011-03-25 DOI: 10.4314/JAST.V16I1-2.64779
K. Ajao, O. Oladosu, O. Popoola
{"title":"Cost-benefit analysis of hybrid wind-solar power generation by homer power optimization software","authors":"K. Ajao, O. Oladosu, O. Popoola","doi":"10.4314/JAST.V16I1-2.64779","DOIUrl":"https://doi.org/10.4314/JAST.V16I1-2.64779","url":null,"abstract":"HOMER power optimization software for evaluation of design and performance of both off-grid and gridconnected power systems has been applied for cost-benefit analysis of a wind-solar hybrid power generation system. Comparison was also made with the cost per kilowatt of grid power supply. The hybrid system had a pay-back period of about thirty-three years. The central grid power was the least expensive option, but might not be available to most rural households far from the grid. Hence, the autonomous distributive system of hybrid power generation was advantageous.","PeriodicalId":9207,"journal":{"name":"British Journal of Applied Science and Technology","volume":"18 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2011-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90291653","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 14
Control of cattle trypanosomiasis in coastal savannah of Ghana Part I: triangulation method for mixed-mode research 加纳沿海草原牛锥虫病的防治第一部分:混合模式研究的三角测量方法
British Journal of Applied Science and Technology Pub Date : 2011-03-25 DOI: 10.4314/JAST.V16I1-2.64791
Rk Esena
{"title":"Control of cattle trypanosomiasis in coastal savannah of Ghana Part I: triangulation method for mixed-mode research","authors":"Rk Esena","doi":"10.4314/JAST.V16I1-2.64791","DOIUrl":"https://doi.org/10.4314/JAST.V16I1-2.64791","url":null,"abstract":"Triangulation design of mixed-mode research on control of trypanosomiasis involving Participatory Rural Appr-aisal (PRA), surveys, parasitological studies and satellite data (as a holistic approach) is presented. Trypanoso-miasis is a disease affecting human and livestock, and the multi-method research approach was adopted to anal-yse accurately information on trypanosomiasis surveys and control methods. Triangulation is based on the assu-mption that weakness in a single method would be compensated by strengths of other methods, and qualitative results were supplemented by the quantitative methods to improve validity and reliability of data. The research focussed on farmer’s production objectives, use of Berenil® to control trypanosomiasis, and satellite mapping of areas at risk of diseases for targeting predictions and control. For convergence of results, different aspects of the disease, with respect to risk areas, severity, disease location and patterns, were investigated for validity and reli-ability of trypanosomiasis survey and control by triangulation.","PeriodicalId":9207,"journal":{"name":"British Journal of Applied Science and Technology","volume":"106 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2011-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88098194","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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