Browsing School of Pure and Applied Sciences by Title
Now showing items 132-151 of 170
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Screening of Plant Extracts Possessing Methylenedioxyphenyl (MDP) Group as Potential Synergists in Insecticide Formulations using the Maize Weevil, Sitophilus Zea-mais (Motsch.)
(Merit Research Journals, 2020)Synergists are compounds that are either negligibly toxic or non-toxic to insects when applied on their own, but enhance the efficacy of an insecticide. Many insects are able to detoxify insecticide molecules and survive ... -
Seasonal time series data imputation: comparison between feed forward neural networks and parametric approaches
(JKUAT Press Ltd, 2005)Missing data in a time series may be an obstacle that may prevents further analysis of the available series either for control, explanations or forecasting. This paper addresses the problem of "‘filling in"' missing data ... -
Seasonal time series forecasting: A comparative study of ARIMA and ANN models
(African Journal of Science and Technology (AJST), 2004)This paper addresses the concerns of Faraway and Chatfield (1998) who questioned the forecasting ability of Artificial Neural Networks (ANN). In particular the paper compares the performance of Artificial Neural Networks ... -
A SEMI-PARAMETRIC MULTIPLICATIVE BIAS REDUCTION DENSITY WITH A PARAMETRIC START
(Pushpa Publishing House, 2018)In this study, a multiplicative semiparametric fourth order bias reduction density is proposed. The proposed density accommodates all parametric distributions and produces optimum results even in situations where the ... -
A Simple Stochastic Stomach Cancer Model with Application
(Science Publishing Group, 2018-04)Survival analysis majors mainly on estimation of time taken before an event of interest takes place. Time taken before an event of interest takes place is a random process that takes shape overtime. Stochastic processes ... -
Simulation of a Deterministic Model of HIV Transmission between Two Closed Patches
(Journal of Advances in Mathematics and Computer Science, 2020)Numerical simulation of a deterministic model of HIV transmission between major cities in Kenya is carried out. The model considered two closed patches connected by the commuter movements of truck drivers being the agents ... -
Spatial expression of the Arabidopsis hydroperoxide lyase gene is controlled differently from that of the allene oxide synthase gene
(Taylor & Francis, 2014-12-13)The hydroperoxide lyase (HPL) pathway for six carbon (C6) volatiles and the allene oxide synthase (AOS) pathway for jasmonates (JAs) share the first part of the pathway. To avoid competition, a separate localization of ... -
Stability of phytochemicals as sources of anti-inflammatory nutraceuticals in beverages—A review
(Elsevier, 2013)Recently phytochemical constituents have attracted a lot of interest as sources of functional ingredients in food product formulations. However, before being incorporated into foods or beverages the stability of these ... -
The state of cancer in Meru, Kenya: a retrospective study
(2019)It is projected that by 2030, 70% of all cancer related deaths will occur in low-middle income countries. However, data on the state of cancer in most African countries is scanty. Cancer estimates for Kenya are based on ... -
A structural investigation of the D2O solvated, acetone solvated and nonsolvated 1,4-Diazabicyclo[2.2.2]octane complexes of the half sandwich moiety [(η5-C5H5)(CO)2Fe]
(Sabinet, 2013)Two new solvates of the dinuclear salt {(η5-C5H5)(CO)2Fe}2(μ-DABCO)](BF4)2 (DABCO = 1,4-diazabicyclo[2.2.2]octane); 1 (D2O solvate) and 2 (acetone solvate), and the mononuclear salt [(η5-C5H5)(CO)2Fe(DABCO)]BF4, 3, have ... -
A STUDY OF A HYDRO MAGNETIC FLUID FLOW IN A ROTATING SYSTEM BOUNDED BY TWO PARALLEL PLATES
(Jomo Kenyatta University of Agriculture and Technology, 2013)An electrically conducting fluid flowing between two parallel plates has been considered in this study. The fluid flow is unsteady and a magnetic field is applied perpendicular to the plates. Various configurations have ... -
Study on the Effect of Thiobacillus Intermedius Bacteria on the Physico-Mechanical Properties of Mortars of Ordinary Portland Cement
(PubMed, 2020)Most of concrete structural failures are attributed to poor workmanship and poor engineering designs. Some microorganisms present in sewer systems can degrade the concrete and/or mortar. Concrete failures due to microbial ... -
Synergistic Evaluation of Selected Plant Extracts on Potency of Pyrethrins against the Maize Weevil, Sitophilus zea-mais (MOTSCH.)
(Merit Research Journals, 2020-11)The interest in utilization of botanical insecticides, particularly essential oils have become increasingly relevant in the control of insect pests. Many plant products and their bioactive compounds with repellent, antifeeding ... -
Syntheses and structural characterization of 2,4,6-trimethylaniline complexes of iron carbonyls
(Inorganica Chimica Acta, 2014)The new 2,4,6-trimethylaniline complexes [Cp∗Fe(CO)2(NH2C6H2(CH3)3)]+ (3) and [CpFe(CO)2(NH2C6H2(CH3)3)]+ (4) (Cp∗ = η5-C5(CH3)5; Cp = η5-C5H5) have been synthesized and isolated in high yields as tetrafluoroborate salts. ... -
Syntheses, structural elucidation and reactions of allylamino compounds of the type, [η5-C5R5(CO)2Fe(NH2CH2CHCH2)]BF4
(Pergamon, 2012)The reaction of 3-aminoprop-1-ene (allylamine) with the etherate complexes [(n5-C5R5)(CO)2Fe(L)]+(R = H; L = Et2O; R = CH3; L = THF) have been investigated and found to give air stable allylamino com-plexes [(n5-C5R5)(CO ... -
Synthesis and Characterization of Macrocyclic Polyether N, N′-Diallyl-7, 16-diaza-1, 4, 10, 13-tetraoxa-dibenzo-18-crown-6
(Multidisciplinary Digital Publishing Institute, 2016)In this study an efficient and direct production procedure for a macrocyclic polyether N,N 1 diallyl-7,16-diaza-1,4,10,13 -tetraoxa-dibenzo-18-crown-6 from the reaction of catechol and N,Nbis (2-chloroethyl)prop-2-en-1-amine ... -
Synthesis and characterization of Y2O3:Eu3+ phosphors using the Sol-Combustion method.
(Elsevier B.V., 2014)Y2O3: Eu3+ phosphor powders were prepared by the Sol-Combustion synthesis method using a sulfur-contained organic fuel in an ethanol–aqueous solution. The structural, morphological and optical properties of the as-prepared ... -
Synthesis, characterization and crystal structures of two polymorphs of the iodo-bridged ruthenium salt, μ-iodido-bis {η 5-cyclopentadienyl-dicarbonyl-ruthenium (II)} tetrafluoroborate
(Elsevier, 2013)The reaction of RpI (Rp = (η5-C5H5)Ru(CO)2) and AgBF4 in two different solvents, tetrahydrofuran and dichloromethane afforded two polymorphs of the iodo-bridged cationic complex [Rp2I]BF4. Polymorph I precipitates out of ... -
Synthesis, characterization and structural elucidation of water-soluble 1-aminoalkane and α, ω-diaminoalkane complexes of the pentamethylcyclopentadienyliron dicarbonyl cation,[Cp∗(CO) 2 Fe]+
(Elsevier, 2012)A series of water-soluble alkylaminopentamethylcyclopentadienyliron dicarbonyl complexes, [Cp∗(CO)2Fe{NH2(CH2)nCH3}]BF4 (n = 2–6; Cp∗ = η5-C5Me5) and the diaminopropane bridged complex, [{Cp∗(CO)2Fe}2{μ-NH2(CH2)3NH2}](BF4)2 ... -
Synthesis, characterization and structural elucidation of water-soluble 1-aminoalkane and α,ω-diaminoalkane complexes of the pentamethylcyclopentadienyliron dicarbonyl cation, [Cp∗(CO)2Fe]+
(Elsevier, 2012)A series of water-soluble alkylaminopentamethylcyclopentadienyliron dicarbonyl complexes, [Cp ∗ (CO) 2 Fe{NH 2 (CH 2 ) n CH 3 }]BF 4 (n=2–6; Cp ∗ =η 5 -C 5 Me 5 ) and the diaminopropane bridged complex, [{Cp ∗ (CO) 2 Fe} ...