• Optimization of deformations and hoop stresses in TSV liners to boost interconnect reliability in electronic appliances 

  Juma, Mary A.; Xuliang, Zhang; Bai, He S.; Ahmed, I. A. A. (International Society for Optics and Photonics, 2015)

  Recently, there has been a lot of research with electronic products because more and different functions are integrated into devices and the final product sizes have to be small to meet the market demand. A lot of research ...
• S-parameters optimization in both segmented and unsegmented insulated TSV 

  Juma, Mary A.; Zhang, Xuliang; Bai, He S. (IEEE, 2016-11)

  A segmented and unsegmented 3D insulated copper through silicon vias (TSVs) of diameter 10μm, height 100μm and silicon of sizes 100μm by 100μm by 100μm are modelled using analysis system (ANSYS) and equivalent circuit using ...
• Variations in hoop stresses among silicon dioxide, polystyrene and polypropylene carbonate through silicon via liners 

  Juma, Mary A.; Zhang, Xuliang; Bai, He S. (Atlantis Press, 2015-12)

  Through Silicon Via are the widely used interconnects in the semiconductors industry. They are designed in different ways to meet the market demands. These interconnect need protection from both internal and external ...
• Hoop stress development on silicon dioxide liner in through silicon via 

  Juma, Mary A.; Zhang, Xuliang; Bai, He S. (IEEE, 2015)

  Through Silicon Via Interconnects are usually protected with liners. A research on liners was done and conclusion made that they experience reliability problems like hoop stress which put them and the Through Silicon Via ...
• Optimisation of electroluminescence setup for characterisation of photovoltaic module degradation 

  Kwembur, Isaac M.; Crozier, J. L.; van Dyk, E. E.; Vorster, F. J. (2018)

  Electroluminescence (EL) is a useful characterisation tool for the early detection of performance limiting defects such as micro-cracks, unwanted impurities inside photovoltaic (PV) module cells and grain boundaries[1][2]. ...
• Comparative study of Potential Induced Degradation approaches in multicrystalline Si PV modules 

  Kwembur, Isaac M.; McCleland, J. L. C.; van Dyk, E. E.; Vorster, F. J. (2019-11)

  Potential Induced Degradation (PID) causes major reliability issues, since it results in significant performance degradation and negatively affects the durability of cells, modules and PV systems. In this work three ...
• Implementation of technical specifications to standardise and improve electroluminescence imaging test setups 

  McCleland, Jacqui C.; Kwembur, Isaac M.; Dix-Peek, Ross; Vorster, Frederik; van Dyk, Ernest E. (2019-12)

  Electroluminescence (EL) is an important tool in photovoltaic (PV) module quality testing and module degradation assessment. EL imaging is primarily a qualitative test that allows for cell cracks and severe damage to ...
• Parameter optimisation of individual cells through voltage dependent electroluminescence of an experimental silicon module 

  Dix-Peek, Ross M.; Kwembur, Isaac M.; van Dyk, Ernest E.; Vorster, Frederik J.; Pretorius, Christiaan J. (2018-06)

  This paper outlines a method which can be used to nondestructively characterise individual Photovoltaic (PV) cell Current-Voltage (IV) data for cells encapsulated within a module. In this study a Genetic Algorithm (GA) ...
• Assessing the interconnect reliability, stress and deformation around via in flip chips 

  Juma, Mary A.; Xuliang, Zhang (2014-09)

  Analysis System (ANSYS) Tutorial, two dimensional (2D) fracture analysis release 14.0 helped us develop new ideas about stress development and deformation around via in flip chips. The chips are from five different materials ...
• A mobile application (I-masomo) for enhancing information access for university course selection in Kenya 

  Musila, Kim M.; Makhanu, Everlyne

  The use of Mobile device in our everyday life has become inevitable due to their availability, affordability, portability and network coverage. In learning, mobile devices present a solution to a number of educational ...
• Evaluation of Open Source Software with QualiPSO OMM: a case for Bungeni and AT4AM for All 

  Malanga, Kennedy N.; Mehat, Jean; Ganchev, Ivaylo; Wandeto, John; Shikali, Casper S. (2015-02)

  In this study, we tested the reliability of QualiPSO OMM by using it to evaluate the maturity and quality of Bungeni and AT4AM for All Parliamentary Legislative Systems. We found out that Qualipso OMM assessment has ...
• Tea and Health 

  Koech, Robert; Wachira, Francis N.; Raphael, Ngure; Kerio, Lilian (2013-12)

  This study is part of the ASARECA regional Food Price Trend Analysis and Policy Options for Enhancing Food Security project being implemented in Tanzania, Kenya, Uganda, Ethiopia, and Rwanda. It contains preliminary ...
• Non-tariff barriers in the tea trade and consumer safety: Selected heavy metals in CTC black tea 

  Moseti, Kelvin; Kinyanjui, Thomas; Kanyiri, Wanyoko J.; Wachira, Francis N. (2013-12)

  Heavy metals, in addition to being associated with the etiology of a number of diseases have been listed as non-tariff trade barrier to the tea trade. Therefore, accurate quantitation of levels of certain elements in tea ...
• Antioxidant, antimicrobial and synergistic activities of tea polyphenols 

  Wachira, Francis N.; Koech, R. K.; Wanyoko, J. (Elsevier, 2014)

  Background: Microbial resistance has become an increasing global problem and there is a need to find out novel potent antimi-crobial agents with alternative modes of action as accessories to antibiotic therapy. Methods ...
• Assessing the effect of grading on the in vitro availability of Fe, Zn, Cu, Pb and Cd from CTC black tea 

  Wachira, Francis N.; Moseti, K. O.; Kinyanjui, Thomas; Wanyoko, John K. (2014-09)

  In vitro analyses of trace element content in biological systems play an increasingly important role in assessing the environmental impact on health. A quantitative study of five trace elements namely Fe, Zn, Cu, Pb and ...
• Type: Poster Presentation Antioxidant, antimicrobial and synergistic activities of tea polyphenols 

  Wachira, Francis N.; Koech, Robert; Wanyoko, John K. (Elsevier, 2014-04)

  Background: Microbial resistance has become an increasing global problem and there is a need to find out novel potent antimi-crobial agents with alternative modes of action as accessories to antibiotic therapy. Methods & ...
• Biochemical relationships involving multiple virus infections, dry matter and selected nutritional attributes in orange fleshed sweetpotato 

  Wachira, Francis N.; Kiarie, S. M.; Karanja, L. S.; Obonyo, M. (2014)

  Sweet potato is a major source of dietary carbohydrate and a key food security crop in Kenya. Production of orange-fleshed sweetpotato (OFSP) in Kenya is constrained by sweetpotato virus diseases whose synergistic interaction ...
• Optimization of Sn. Se, Deposited by Reactive Thermal Evaporation for Solar cell Application 

  Munguti, Lawrence K.; Njoroge, W. K.; Musembi, R. J. (2016-07-15)

  In this study, tin selenide was prepared at different ratios using tin and selenium pellets in glass tube filled with argon and then heated up to 350'C. The resulting materials were cut Into ingots which were used in ...
• Applying Variant Variable Regularized Logistic Regression for Modeling Software Defect Predictor 

  Angolo, Shem M.; Armah, Gabriel K.; Luo, G.; Qin, Ke (2016-05)

  Empirical studies on software defect prediction mod els have come up with various predictors. In this study we examined variable regularized factors in conjunction with Logistic regression. Our ...
• Secure Opportunistic Computing Privacy Preserving Group Signature Authentication Scheme for M-Healthcare Emergency 

  Angolo, Shem M.; Xu, Chunxiang; Kamenyi, Domenic M. (2015-09)

  M-healthcare applications make use of Body Sensor Network nodes to capture health data from a patient, transfer the data via blue tooth to the patient’s smartphone, which in turn transmits the information via a 3G network ...

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