School of Biological and Physical Science: Recent submissions
Now showing items 661-680 of 933
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Performance of some quinoa (Chenopodium quinoa Willd.) genotypes in Kenya
(Taylor & Francis, 2010-01-01)Quinoa (Chenopdium quinoa Willd.) has been cultivated for thousands of years in South America for its nutritious grain and leaves. Demand for the crop has risen in the recent past. In order to satisfy the demand, there is ... -
Biofortified sorghum in Africa: using problem formulation to inform risk assessment
(Nat. Biotechnol., 2010)Most of the genetically modified (GM) crops approved to date (eg, corn, cotton and soybean improved for insect resistance or herbicide tolerance) do not have compatible wild relatives near their intended area of cultivation, ... -
Reproduction Inhibition Effects of Neem Products on the Larger Grain Borer (Prostephanus truncatus) (HORN) in Stored Maize Grains
(Egerton Journal of Science & Technology, 2012-12-07)The larger grain borer (LGB), Prostephanus truncatus (HORN), has become one of the most important insect pest of stored maize in tropical Africa where it was introduced in the early 1980s. It has the major effect of seriously ... -
MATHEMATICAL INVESTIGATION ON THE EFFECT OF NUMBER OF BRANCHES ON WATER HAMMER
(Pushpa Publishing House, 2013-10-01)This paper looks at water hammer with an emphasis on the number of branches. The mathematics of water hammer are described in a transient condition. This includes the momentum and continuity equations for conduits. A ... -
Effects of Conduction and Variable Properties On a Two Dimensional Conjugate Heat Transfer of a Nanofluid in a Microchannel
(International Scientific Press, 2013-10-01)In this paper we analyze the effects of conduction and variable properties on a two dimensional conjugate heat transfer of a nanofluid containing a mixture of two fluids namely, Aluminium oxide (Al2O3) and water. Nanoparticles ... -
Mathematical analysis of tip speed ratio of a wind turbine and its effects on power coefficient
(2014)In this paper we estimate the value of tip speed ratio of a wind turbine and evaluate its effects on power coefficient. The power coefficient, Cp, is achieved at a particular tip speed ratio, β, which is specific to the ... -
Mathematical model of variable speed pitch regulated turbine in a wind energy conversion system
(2014)Pitch control of wind turbine in a wind energy conversion system involves the change of the rotor blade pitch angle along the rotor axis. Most compa-nies are faced with the challenge of maintaining a steady and optimal ... -
Finite Difference Analysis of 2-Dimensional Acoustic Wave with a Signal Function
(2015-12-09)This paper describes progress on a two dimensional numerical simulation of acoustic wave propagation that has been developed to visualize the propagation of acoustic wave fronts and to provide time-domain signal. In this ... -
On the steady MHD couette flow between two infinite parallel plates in an uniform transverse magnetic field
(2015)In this paper we consider laminar viscous incompressible fluid between two infinite parallel plates when the upper plate is moving with constant velocity Uo and the lower plate is held stationary under the influence of ... -
Numerical solutions of the Burgers’ system in two dimensions under varied initial and boundary conditions
(2012)In this paper, we generate varied sets of exact initial and Dirichlet boundary conditions for the 2-D Burgers’ equations from general analytical solutions via Hopf-Cole transformation and separation of variables. These ... -
Steady MHD poiseuille flow between two infinite parallel porous plates in an inclined magnetic field
(2012)In this paper, we examine the motion of a two dimensional steady flow of a viscous, electrically conducting, incompressible fluid flowing between two infinite parallel porous plates under the influence of transverse magnetic ... -
Mathematical modelling of wind turbine in a wind energy conversion system: Power coefficient analysis
(2012-01)The world is increasingly going green in its energy use. Wind power is a green renewable source of energy that can compete effectively with fossil fuel as a generator of power in the electricity market. For this effective ... -
Ethnobotanical study of medicinal plants used by Sabaots of Mt. Elgon Kenya.
(africanethnomedicines, 2010)Though the majority of people in Kenya and at Kopsiro Division in species to manage human ailments, the indigenous knowledge largely remains undocumented. Therefore, an ethnobotanical study was conducted on medicinal plant ... -
Sorghum and salinity: I. Response of growth, water relations, and ion accumulation to NaCl salinity
(Crop Science Society of America, 2004)Crops grown in salt affected soils may suffer from drought stress, ion toxicity, and mineral deficiency leading to reduced growth and productivity. The present study was conducted to determine how salinity affects growth, ... -
The effects of blending clonal leaf on black tea quality
(Elsevier, 1999-08-01)Although most clones are selected for quality and yields, there are clones in production with superior yields but producing inferior black tea quality and vice versa. Some of these clones with superior yield give very poor ... -
Factors impeding tea production in smallholder sub-sector of the Kenya tea industry: an assessment extension staff awareness of existing technologies.
(Tea Research Foundation of Kenya, 2000)This study assessed the level of extension staff in the various technological packages when compared to the agronomic research recommendations. The survey covered 76 extension staff in Kirinyaga, Nyambene, Nandi and Nyamira ... -
Chlorophyll meter use on field grown tea: 1. The optimum leaf age and measuring positions on a leaf blade.
(Tea Research Foundation of Kenya, 2000)In a field experiment conducted in Kenya, a Hydro N-tester chlorophyll meter was used to determine the optimum age and reading position for the measurement of chlorophyll in leaves of tea (clone 6/8). Meter readings were ... -
Split application of nitrogen fertilizer rates in two tea cultivars grown in the Eastern and Western highlands of Kenya: I. Confirmatory results on yield effects.
(Tea Research Foundation of Kenya, 2000)Two experiments were conducted in Kericho and Kangaita, Kenya during 19991-98 to investigate the effects of nitrogen fertilizer rates (50, 100, 200, 400 and 800 kg/ha) and frequencies of application (1, 2 and 4 split ... -
Effect of NPK Blended Fertilizer Rates on Growth and Yield Attributes of Finger Millet Varieties Grown in Acidic Soil of Western Kenya
(Archives of Current Research International, 2017)Finger millet (Eleusine coracana L) is the staple food among the population of Africa and Asia that supplies a major portion of calories and protein and has a wide range of adaptability to abiotic and biotic stresses and ...