School of Engineering and Technology: Recent submissions
Now showing items 81-100 of 115
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Broadband quarter-wave plate based on dielectricembedded plasmonic metasurface
(Royal Society of Chemistry, 2017)High transmission plasmonic and all-dielectric metasurface wave plates have been reported in recent studies. However, narrow bandwidth and low polarization conversion need to be addressed to attain even better operation ... -
Polarization independent and tunable plasmon induced transparency for slow light
(Royal Society of Chemistry, 2017)A novel metamaterial composed of a Ag nanoprism periodic tetramer is proposed in this paper. The metamaterial has high structural symmetry and shows polarization independent plasmon-induced transparency (PIT), demonstrated ... -
Polarization converter with controllable birefringence based on hybrid all-dielectric-graphene metasurface
(Springer US, 2018-12)Previous studies on hybrid dielectric-graphene metasurfaces have been used to implement induced transparency devices, while exhibiting high Q-factors based on trapped magnetic resonances. Typically, the transparency windows ... -
Ag nanoprism metamaterial based tunable plasmonic logic gate
(IOP Publishing, 2017)A metamaterial comprised of asymmetrically arranged Ag nanoprisms has been proposed and investigated in this paper. The metamaterial shows a polarization dependent PIT effect. The metamaterial with its periodic length ... -
Localized Surface Plasmon Resonance Dependence on Misaligned Truncated Ag Nanoprism Dimer
(Springer, 2012)Misaligned edge-to-edge dimers are the common products during the preparation of Ag nanoprism dimers using self-assembly method. However, in the self-assembly method, Ag nanoprisms are easily truncated because they are easy ... -
Review of Software Engineering in the Context of Embedded and Cyber Physical Systems
(American Journal of Operations Management and Information Systems, 2017)Embedded systems have overwhelmingly penetrated systems globally in areas such as transportation, industrial-automation, medical-equipment, communication and energy as a result of Innovations being triggered by software ... -
Societal Implications of IT in Religion for Developing Countries
(2017)Information Technology has penetrated nearly all aspects of our daily lives such that relationships associated with individuals and organizations are digitally enabled and mediated. Advances in IT have led to changes in ... -
A Model for Clustering Social Media Data for Electronic Learning
(American Journal of Artificial Intelligence, 2017)Through Social media, people are able to write short messages on their walls to express their sentiments using various social media like Twitter and Facebook. Through these messages also called status updates, they share ... -
Effect of harvest age and thermal processing on poly-γ-glutamate folates and minerals in African cowpea leaves (Vigna unguiculata)
(Elsevier, 2012-03)Cowpea leaves (Vigna unguiculata) are highly consumed in Africa because the plant is easy to cultivate and highly disease/drought tolerant. The vegetables are harvested between 4 and 9 weeks of maturity. The objectives of ... -
Application of Renewable Energies for Storage of Horticultural Produce in Marginal areas of Kenya
(2017)The objective of the research were to a prototype solar-charcoal cooler and test its performance in the temperature development and products storage ability. A prototype solar-charcoal cooler was developed at the Biomechanical ... -
Kinematics of Thermal Inactivation of Peroxidase and color Degradation of African Cowpea (vigna unguiculata) Leaves
(Institute of Food Technologists, 2015)Cow pea leaves form an important part of the diet for many Kenyans, and they are normally consumed after a lengthycookingprocessleadingtotheinactivationofperoxidase(POD)thatcouldbeusedasanindicatorforthepotential shelf ... -
Reducing Real and Reactive Power Losses in the Power Distribution System by DFIG Placement and Sizing Using Ordinary PSO and HGAPSO
(International Journal of Emerging Technology and Advanced Engineering, 2012)Due to the increased importance of DFIGs in optimization of real and reactive power losses and the maintenance of voltage profile, the general methods of DG placement and sizing in the existing literature cannot be ... -
Modelling Simulation and Optimal Sizing of a Hybrid Wind, Solar PV Power System in Northern Kenya
(ational Journal of Renewable Energy Research, 2016)Solar and wind, the most abundant renewable energy resources are still expensive to deploy and are unreliable as they are intermittent. It has long been postulated in open published literature that solar and wind have ... -
Optimal Under - frequency Load Shedding using Cuckoo Search with Levy Flight Algorithm for Frequency Stability Improvement
(International Journal of Emerging Technology and Advanced Engineering, 2015)Frequency stability in a power system is very important as it determines the synchronous speed of electrical machines. Therefore it should remain within acceptable limits even when the system is disturbed. In order to ... -
Optimal Under - voltage Load Shedding using Cuckoo Search with Levy Flight Algorithm for Voltage Stability Improvement
(International Journal of Engineering Science Invention, 2015)Voltage stability has become a serious threat of modern power system operation nowadays. To tackle this problem properly, load shedding is a countermeasure taken as a last resort. However, its consequences might result in ... -
Multi Objective Dynamic Economic Dispatch with Cubic Cost Functions
(Science Publishing Group, 2015)The formulation and solution of the Dynamic Economic Dispatch (DED) problem is one of the key disciplines in modern power system operation, planning, operation and control. Past researches have considered DED on Quadratic ... -
24-Hours Load Forecasting Using a Hybrid of Genetic Algorithm (GA) and Particle Swarm Optimization (PSO) for Optimized Neural Network
(International Journal of Emerging Technology and Advanced Engineering, 2016)Short-term load forecasting (STLF) has emerged as one of the most important fields of study for efficient and reliable operation of power system. It plays a very significant role in the field of load flow analysis, contingency ... -
Voltage Controller for Radial Distribution Networks with Distributed Generation
(International Journal of Scientific and Research Publications, 2014)This paper presents a coordinated network controller whose objective is to maintain an optimal voltage profile across radial distribution networks with distributed generation. This is done by varying the output of the ... -
Alternative Diesel Engine Fuel from Kenyan Pishori Rice Bran
(International Journal of Engineering Science Invention, 2013)Rice bran used as biomass material was acquired from small scale rice millers in Wang’uruMwea, Kirinyaga County, Kenya. The oil was extracted from the rice bran using petroleum ether which was preferred due to its high ... -
Invasive species in east Africa: current status for informed policy decisions and management
(E. Africa: Status and policy in biological invasions, 2013)Invasive alien species are the second leading cause of biodiversity loss in the world today. A number of hypotheses have been advanced to explain the proliferation of invasive species. These hypotheses include deficiency ...
