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Rainfall Variability over Tanzania during October to December and Its Association with Sea Surface Temperature (SST)

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Atmospheric and Climate Sciences 2021年第2期11卷 324-341页

作者： Hassan Khatib Ame Agnes Lawrence Kijazi Ladislaus Benedict Changa Kantamla Biseke Mafuru Mohamed khamis Ngwali Masoud Makame Faki Asya Omar Hmad miraji khamis miraji Tanzania Meteorological Authority Dar es Salaam Tanzania

The current study examines the interannual rainfall variability and its associated atmospheric circulation in Tanzania during October-December (OND) rainfall season based on 1974 to 2010 climatology. The Empirical Orthogonal Function (EOF), composite and correlation analysis were used in this study. Years with enhanced precipitation are found to be associated with the low level moist and unstable wind from Congo basin which organizes and forms a confluent zone, an inter tropical convergence zone (ITCZ) extending from Congo to northern sector of the country. It however, characterizes low-level westerly moisture flux transport sourced from Congo basin, ascending limb of the local Indian Ocean Walker circulation over East Africa which enhances convection for wetness condition. Wet years are also coupled with the positive Indian Ocean Dipole (IOD) and the warm phase of the El Nino Southern Oscillation (ENSO) condition. On the spatial scale, both the IOD and ENSO indices are well correlated with OND rains over the bimodal areas (Lake Victoria basin, North Eastern Highlands (NEH), and northern coast) with strong correlation being to the NEH. Strong temporal correlation is revealed between the OND rains and IOD (r = 0.6304) compared to ENSO (r = 0.5538) indicating that anomalous warming over the western Indian Ocean has a faster response to OND rains in Tanzania than the remote influence induced by anomalous warming from the central Pacific Ocean. The patterns associated with dry years are found to be linked with the low-level divergence accompanied by convergence in the upper level. This condition enhances continuous descending motion accompanied with suppression in rainfall activities. Dry years are also associated with negative IOD, cold phase of ENSO condition, descending limb of the Walker Circulation and significant reduction in the westerly moisture flux transport sourced from Congo basin towards the western sector and Lake Victoria basin.

关键词： OND Rainfall Empirical Orthogonal Function Correlation Tanzania

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Porosity,cracks,and mechanical properties of additively manufactured tooling alloys:a review

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Advances in Manufacturing 2022年第2期10卷 175-204页

作者： Prveen Bidare Amaia Jimenez Hany Hassanin khamis Essa School of Mechanical Engineering University of BirminghamBirminghamUK TECNUN Escuela de Ingenieria Universidad de NavarraManuel de Lardizabal 15San Sebastian20018Spain School of Engineering Technologyand DesignCanterbury Christ Church UniversityCanterbury CT11QUUK

Additive manufacturing(AM)technologies are currently employed for the manufacturing of completely functional parts and have gained the attention of hightechnology industries such as the aerospace,automotive,and biomedical *** is mainly due to their advantages in terms of low material waste and high productivity,particularly owing to the flexibility in the geometries that can be *** the tooling industry,specifically the manufacturing of dies and molds,AM technologies enable the generation of complex shapes,internal cooling channels,the repair of damaged dies and molds,and an improved performance of dies and molds employing ***,a reviewof AM processes and materials applied in the tooling industry for the generation of dies and molds is *** technologies used for tooling applications and the characteristics of the materials employed in this industry are first *** addition,the most relevant state-of-the-art approaches are analyzed with respect to the process parameters and microstructural and mechanical properties in the processing of high-performance tooling materials used in AM ***,studies on the AM of ferrous(maraging steels and H13 steel alloy)and non-ferrous(stellite alloys and WC alloys)tooling alloys are also analyzed.

关键词： Additive manufacturing(AM) Tooling alloys Super alloys Hybrid manufacturing Post processing

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The impact of an educational intervention in caregiving outcomes in Jordanian caregivers of patients receiving hemodialysis: A single group pre-and-post test

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International Journal of Nursing Sciences 2018年第2期5卷 144-150页

作者： Eman khamis Alnazly Nursing Deartment Al-Ahliyya Amman UniversityJordan

Objectives:Chronic renal failure affects the physiological,psychological,functional ability,and independent status of the patient,which might result in a burden to the family members caring for *** objective of the study was to identify caregivers'level of burden and establish the impact of educational intervention programs on caregiving ***:This was a one-group pre-test post-test study conducted between April and August 2017 on family caregivers of hemodialysis patients.A convenient sample of 169 caregivers was used.A sociodemographic questionnaire,the OBCS,and BCOS were utilized for data collection,which occurred at baseline and two weeks *** collected data were analyzed using SPSS where t-test determined the impact of the ***:Caregivers were found to be moderately burdened(M=2.73,SD=0.23)and their lives had changed for the worst as a result of caregiving(M=3.17,SD=5.89).There were significant differences in caregiving outcome scores before and after the intervention(P<0.05).Conclusion:Caring for patients receiving hemodialysis adds extra responsibilities to the caregivers'schedule thus leaving them substantially *** caregivers on the required care eased their burden and improved caregiving *** are made that healthcare professionals should assess caregiver burden,and address their physical and mental health *** should also be regularly educated on the regular caregiving tasks to ease their burden.

关键词： Burden Caregiver Hemodialysis Informative materials Self-perceived burden

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Effects of heat and mass transfer on nonlinear MHD boundary layer flow over a shrinking sheet in the presence of suction

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Applied Mathematics and Mechanics(English Edition) 2008年第10期29卷 1309-1317页

作者： Muhaimin R. Kandasamy Azme B. khamis Centre for Science Studies University Tun Hussein Onn Malaysia 86400 Parit Raja Batu Pahat Johor Malaysia

This work is concerned with Magnetohydrodynamic viscous flow due to a shrinking sheet in the presence of suction. The cases of two dimensional and axisymmetric shrinking are discussed. The governing boundary layer equations are written into a dimensionless form by similarity transformations. The transformed coupled nonlinear ordinary differential equations are numerically solved by using an advanced numeric technique. Favorability comparisons with previously published work are presented. Numerical results for the dimensionless velocity, temperature and concentration profiles as well as for the skin friction, heat and mass transfer and deposition rate are obtained and displayed graphically for pertinent parameters to show interesting aspects of the solution.

关键词： shrinking sheet suction at the surface Runge Kutta Gill method magnetic effect

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Numerical investigation of variable viscosities and thermal stratification effects on MHD mixed convective heat and mass transfer past a porous wedge in the presence of a chemical reaction

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Applied Mathematics and Mechanics(English Edition) 2009年第11期30卷 1353-1364页

作者： I. Muhaimin R. Kandasamy Azme B. khamis Computational Fluid Dynamics FSSWUniversiti Tun Hussein Onn MalaysiaParit Raja 86400Batu PahatJohorMalaysia

An analysis is presented to investigate the effects of variable viscosities and thermal stratification on the MHD mixed convective heat and mass transfer of a viscous, incompressible, and electrically conducting fluid past a porous wedge in the presence of a chemical reaction. The wall of the wedge is embedded in a uniform nonDarcian porous medium in order to allow for possible fluid wall suction or injection. The governing boundary layer equations are written into a dimensionless form by similarity transformations. The transformed coupled nonlinear ordinary differential equations are solved numerically with finite difference methods. Numerical calculations up to the thirdorder level of truncation are carried out for different values of dimensionless parameters. The results are presented graphically, and show that the flow field and other quantities of physical interest are significantly influenced by these parameters. The results are compared with those available in literature, and show excellent agreement.

关键词： variable viscosity chemical reaction non-Darcy flow mixed convection,thermal stratification magnetic effect

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Thomson and rotation effects during photothermal excitation process in magnetic semiconductor medium using variable thermal conductivity

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Applied Mathematics and Mechanics(English Edition) 2020年第6期41卷 909-926页

作者： K.LOTFY A.K.khamis A.A.EL-BARY M.H.AHMED Department of Mathematics Faculty of ScienceZagazig UniversityZagazig 44519Egypt Department of Mathematics Faculty of ScienceTaibah UniversityAl-Madinah 30002Saudi Arabia Department of Mathematics Faculty of ScienceNorthern Border UniversityArar 91431Saudi Arabia Arab Academy for Science Technology and Maritime TransportAlexandria 1029Egypt

This study investigates a strong magnetic field acting over an elastic rotator semiconductor *** Thomson effect due to the magnetic field during the photothermal transport process is studied,and the thermoelectricity theory is used to explain the behavior of waves in the homogenous and isotropic medium under the effect of variable thermal *** variable thermal conductivity is considered as a linear function of the *** two-dimensional deformation equations are used to describe the overlaps among plasma,electrical,thermal,and magneto-elastic *** charge density of inertia-particles is considered as a function of time for studying the induced electric *** normal mode analysis is used to obtain the exact solutions of the physical field distributions as part of this *** obtain the complete solutions of the physical field quantities,the certain mechanical loads,electromagnetic effects,thermal effects,and plasma recombination process are applied *** results of the physical distributions are graphically depicted and discussed in consideration of the internal heat source,rotation,and Peltier coefficient.

关键词： photothermal thermal conductivity Thomson effect rotation magnetic field Peltier coefficient

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Current role of extracorporeal membrane oxygenation for the management of trauma patients:Indications and results

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World Journal of Critical Care Medicine 2025年第1期14卷 42-48页

作者： Mohammed Abdulrahman Maryam Makki Malak Bentaleb Dana khamis Altamimi Marcelo AF Ribeiro Junior Department of Surgery College of Medicine and Health SciencesKhalifa UniversityAbu Dhabi 11001United Arab Emirates Department of Surgery Division of TraumaCritical Care and Acute Care SurgerySheikh Shakhbout Medical CityAbu Dhabi 11001United Arab Emirates Department of Surgery Sheikh Shakhbout Medical CityAbu Dhabi 91888ADUnited Arab Emirates Department of Surgery R Adams Cowley Shock Trauma CenterUniversity of MarylandBaltimoreMD 21201United States

Extracorporeal membrane oxygenation(ECMO)has emerged as a vital circulatory life support measure for patients with critical cardiac or pulmonary conditions unresponsive to conventional *** allows blood to be extracted from a patient and introduced to a machine that oxygenates blood and removes carbon *** blood is then reintroduced into the patient’s circulatory *** process makes ECMO essential for treating various medical conditions,both as a standalone therapy and as adjuvant ***-venous(VV)ECMO primarily supports respiratory function and indicates respiratory ***,veno-arterial(VA)ECMO provides hemodynamic and respiratory support and is suitable for cardiac-related *** study reviews recent literature to elucidate the evolving role of ECMO in trauma care,considering its procedural intricacies,indications,contraindications,and associated ***,the use of ECMO in trauma patients,particularly for acute respiratory distress syndrome and cardiogenic shock,has demonstrated promising outcomes despite challenges such as anticoagulation management and complications such as acute kidney injury,bleeding,thrombosis,and *** studies have shown that VV ECMO was associated with significantly higher survival rates than conventional mechanical ventilation,whereas other studies have reported that VA ECMO was associated with lower survival rates than VV *** plays a critical role in managing trauma patients,particularly those with acute respiratory *** research is necessary to explore the full potential of ECMO in trauma *** should have a clear understanding of the indications and contraindications for the use of ECMO to maximize its benefits in treating trauma patients.

关键词： Extracorporeal membrane oxygenation treatments Multiple trauma Respiratory distress syndrome Cardiogenic shock Contraindications Anticoagulants

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Project Management and Risk Asssessment of Pangatupu Industrial Park Project in Zanzibar-tanzania

Project Management and Risk Asssessment of Pangatupu Industr...

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作者： Mohamed khamis Issa 湖南大学

学位级别：硕士

工业项目一直是非洲许多国家的经济支柱,但为了使该国的工业部门蓬勃发展,需要建立有利的投资环境,例如建设更大的现代化海港和机场,提供可靠的公用事业和其他配套产业实体,如建立有竞争力的现代工业园区,以激励产业投资。但是,这种投... 详细信息

工业项目一直是非洲许多国家的经济支柱,但为了使该国的工业部门蓬勃发展,需要建立有利的投资环境,例如建设更大的现代化海港和机场,提供可靠的公用事业和其他配套产业实体,如建立有竞争力的现代工业园区,以激励产业投资。但是,这种投资规模太大,仅靠政府征税、以政府机构作为项目技术实施主体是难以应对的。因为,这些类型的投资需要大量资金、高技能人才和国家承诺,这就是为什么如果不应用项目管理技术和工具来规划和控制这些项目,就会面临无法实现的高风险。富有成果的国家期望。然而,政府管理下的项目执行不力似乎是桑给巴尔的普遍情况。审计报告显示,大部分政府全额融资项目超预算、超法、超时、亏本经营。尽管政府努力审查它的发展政策并提高其人民的技术技能并用工具和设备促进他的机构,但如果没有适当的项目计划,上述努力不足以避免政府项目失败。本研究旨在评估风险并在Pangatupu工业园区(CPIP)项目建设中应用项目管理工具,该项目是桑给巴尔革命政府(RGo Z)正在进行的项目之一。在这个项目中执行的项目管理应用是工作分解结构(WBS)的准备,其中项目可交付成果被分解为易于执行的工作包,责任矩阵(RM),其中每个项目工作包的责任分配给各自的政府机构,并通过使用Proffhub项目软件,还设计了甘特图。还确定了项目任务之间的关系。此外,在控制CPIP项目的进度过程中,网络图中的关键路径方法(CPM)被应用于通过查找和控制CPIP项目中的最长路径来控制项目时间范围。因为,确定项目的关键路径是在预计时间和预算内成功完成项目的关键。CPIP项目控制进度时间结果表明,该项目可比预计完工时间提前24天完工。最后,通过识别潜在风险及其对项目的影响,对Pangatupu工业园区建设进行风险评估,并提出控制缓解方案。识别出的潜在风险之一是经济风险、建设和收缩现场风险、管理风险、技术风险和政治风险。成功的风险管理导致在预计的时间、预算内并以良好的质量完成了项目。

关键词：工业园区项目管理工作分解结构责任矩阵甘特图项目进度网络图关键路径法风险评估

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The development of a high-performance Ni-superalloy additively manufactured heat pipe

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Advances in Manufacturing 2022年第4期10卷 610-624页

作者： Sheng Li khamis Essa James Carr States Chiwanga Andrew Norton Moataz M.Attallah School of Electromechanical Engineering Guangdong University of TechnologyGuangzhou 510006People’s Republic of China School of Engineering University of BirminghamEdgbastonBirmingham B152TTUK Henry Moseley X-ray Imaging Facility Henry Royce Institute for Advanced MaterialsDepartment of MaterialsUniversity of ManchesterManchester M139PLUK European Thermodynamics Ltd 8 Priory Business ParkWistow RoadKibworthLeicestershire LE80RXUK Rolls-Royce plc P.O.Box 31Derby DE248BJUK School of Metallurgy and Materials University of BirminghamEdgbastonBirmingham B152TTUK

Additively manufacturing(AM)has been used to manufacture fine structures with structured/engineered porosity in heat management *** this study,laser powder bed fusion(LPBF)was used to manufacture a high-performance Ni-superalloy heat pipe,through tailoring LPBF process parameters to fabricate thin wall and *** using novel laser scanning strategies,wick structure heat pipes with maximised surface-area-to-volume ratio,fine features size around 100µm,and controlled porosity were successfully *** and X-ray microtomography(micro-CT)were used to investigate the 3D structure of the void space within the *** test results showed that most of the heat pipes made by LPBF had better performance than the conventionally manufactured *** study also investigated the influences of the process parameters on the porosity volume fraction and the feature *** results showed that LPBF process could fabricate thin structure due to the change of melt pool contact *** relationship between process parameters and bead size reported in this study could help design and manufacture heat pipe with complex fine structure.

关键词： Laser powder bed fusion(LPBF) Heat pipe Melt pool Microtomography(micro-CT)

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Micro-fabrication of ceramics:Additive manufacturing and conventional technologies

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Journal of Advanced Ceramics 2021年第1期10卷 1-27页

作者： Hany HASSANIN khamis ESSA Amr ELSHAER Mohamed IMBABY Heba H.EL-MONGY Tamer A.EL-SAYED School of Engineering Canterbury Christ Church UniversityCanterburyCT11QUUK University of Birmingham EdgbastonB152TTUK Kingston University London Penrhyn RoadKingston Upon ThamesSurreyKT12EEUK Department of Mechanical Design Faculty of EngineeringMatariaHelwan UniversityP.O.Box.11718CairoEgypt Jubail University College Mechanical EngineeringKingdom of Saudi Arabia Center for Applied Dynamics Research(CADR) School of EngineeringUniversity of AberdeenAberdeenAB243UEUK

Ceramic materials are increasingly used in micro-electro-mechanical systems(MEMS)as they offer many advantages such as high-temperature resistance,high wear resistance,low density,and favourable mechanical and chemical properties at elevated ***,with the emerging of additive manufacturing,the use of ceramics for functional and structural MEMS raises new opportunities and *** paper provides an extensive review of the manufacturing processes used for ceramic-based MEMS,including additive and conventional manufacturing *** review covers the micro-fabrication techniques of ceramics with the focus on their operating principles,main features,and processed *** that need to be addressed in applying additive technologies in MEMS include ceramic printing on wafers,post-processing at the micro-level,resolution,and quality *** paper also sheds light on the new possibilities of ceramic additive micro-fabrication and their potential applications,which indicates a promising future.

关键词： micro-electro-mechanical system(MEMS) micro-fabrication ceramics micro parts additive manufacturing

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