School of Pure, Applied and Health Sciences (JA): Recent submissions
Now showing items 61-80 of 265
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Structural and optical properties of novel CdSe nanoparticles produced via a facile synthetic route: Studies on the effects of cadmium sources
(2019-04)We report on the successful synthesis of CdSe nanoparticles (NPs) via a facile aqueous approach. Investigation on the effects of various cadmium sources in the precursor solution on the CdSe NPs is discussed. The structural ... -
A comparison investigation of optical, structural and luminescence properties of CdOxTe1−x and CdTexSe1−x nanoparticles prepared by a simple one pot method
(Elsevier, 2018-04)We present L-cysteine capped CdOXTe1−X and CdTeXSe1−X nanoparticles (NPs) prepared in one pot. The as-prepared CdOXTe1−X NPs were found to have a hexagonal crystal structure of CdTe with a cubic phase of CdO. There was, ... -
Effect of growth temperature on the structural, optical and luminescence properties of cadmium telluride nanoparticles
(2018-01)Cadmium telluride (CdTe) has been successfully prepared by a simple wet chemical process at different reaction temperatures. Temperature is one parameter that thermodynamically plays an important role in controlling the ... -
Effects of precursor pH on structural and optical properties of CdTe quantum dots by wet chemical route
(2018-07)l -cysteine capped CdTe quantum dots (QDs) were synthesized in aqueous solution in open air. In order to improve the crystallinity of the CdTe QDs, synthesis conditions were optimized. Effects of different solution pH were ... -
Structural, optical and luminescence properties of CdTe quantum dots: Investigation on the effect of capping ligand ratio
(IOP Publishing Ltd, 2019-03)Well-crystallized cadmium telluride quantum dots (CdTe QDs) were fabricated by a simple wet chemical process under open air condition at a growth temperature of 100 °C. Various amounts of the capping ligands were used in ... -
Capping Ligand Influence on the Structural, Optical and Luminescence Properties of CdTe Nanoparticles Prepared by a Simple Wet Chemical Process
(2019-03)The nature of the capping ligands used and the strength of their interactions with the surface atoms of the nanoparticles (NPs) impact greatly on the material properties and the stability of the resulting NPs. The structural ... -
The influence of reaction times on structural, optical and luminescence properties of cadmium telluride nanoparticles prepared by wet-chemical process
(2016-01)This paper explains one pot synthesis of type II water soluble L-cysteine capped cadmium telluride (CdTe) core shell quantum dots using cadmium acetate, potassium tellurite and L-cysteine as the starting materials. The ... -
High luminescent L-cysteine capped CdTe quantum dots prepared at different reaction times
(2017-07)This paper reports a facile synthesis route of high luminescent L-cysteine capped CdTe quantum dots (QDs). The effect of reaction time on the growth mechanism, optical and physical properties of the CdTe QDs was investigated ... -
Optimization of Split-Plot Design in the Context of Mixture Process Variable Settings
(2021-04)In the presence of process variables, a mixture design has become well-known in statistical modeling due to its utility in modeling the blending surface, which empirically predicts any mixture's response and serves as the ... -
Time series analysis of air pollution trends in Kenya using environmental Kuznets curve
(2020-12)Air pollution occurs when harmful or excessive quantities of substances including gases are introduced into Earth's atmosphere. It may cause diseases, allergies and even death to humans; it may also cause harm to other ... -
Time series analysis of Nandi county government revenue using seasonal autoregressive integrated moving average (SARIMA) model
(2020-10)In Kenya, there are two levels of government namely the National Government (NG) and County Governments (CGs). NG’s revenue is mainly from taxation, borrowing, and grants among other sources while CGs rely on allocation ... -
Extended Cox Model on Duration Taken to Release Cargo at Kenyan Border Entry Point: A Case Study of Malaba Osbp
(Science and Education Publishing, 2020-11)Duration taken to release cargo is one of World Customs Organisation’s most significant instruments of measuring trade facilitation. It is a way of reviewing clearance procedure by measuring the time taken to release cargo ... -
Application of Mixture Experiments in Poultry Feed Formulation
(2018-12)The quality, components, proportions and storage of feeds is critical in poultry farming. The rising prices and poor quality of feeds has constantly led to low returns due to low final weights among birds. The study applied ... -
Survival Analysis of Cancer Patients Using Weibull Parametric Model
(2019-05)Cancer incidence and mortality are rapidly growing worldwide. The reasons are complex but reflect both aging and growth of the population, as well as changes in the prevalence and distribution of the main risk factors for ... -
Assessment of French Beans Production at Kariua in Kandara, Murang’a County- Kenya
(2019-11)A sample survey research was conducted in November 2017 to January 2018 at Kariua area in Murang’a county, Kenya, with a sole aim to assess the current situation experienced by the French bean farmers in the area as well ... -
Modelling Time Default in University Fee Payment Using Cox Proportional Hazard Model
(2019-04)Default is the failure to pay interest or other money that is owed on time. Time default is amount of time taken to clear the given debt past the set time line. Fee payment is guided by the fee payment policy produced by ... -
Time Series Analysis of Road Accidents Using Autoregressive Integrated Moving Average (ARIMA) Model
(2019-04)The road transport industry in Kenya plays a vital role in the life of the majority of her citizens. Many Kenyans utilize different transport modes to reach their various destinations daily. Nearly 3000 people killed on ... -
Monitoring Claim Processing Duration Using Statistical Quality Control
(2019-04)Statistical quality control is an important tool used widely at service provision fields to monitor the overall operation. The significant application of the SPC analysis elements to the operation will make the process ... -
Markov Chain Model for Time Series and its Application to Forecasting Stock Market Prices
(2018-09)A Markov chain is a discrete-valued Markov process; discrete-valued means that the state space of possible values of the Markov chain is finite or countable. This paper seeks to forecast stock market prices using Markov ... -
Analysing Four Factor Second Order Models Using Response Surface Methodology with Application in Germination of Melia volkensii
(2017-12)Second order models are useful in situations where there are curvilinear effects present in the true response function. Such models have real life applications in a wide variety of fields such as agriculture, biology, and ...
