ABSTRACT Acoustic effects such as absorption/amplification of acoustic phonons, Acoustoelectric Effect (AE) and Acoustomagnetoelectric Effect (AME) were studied in Carbon Allotropes. In this thesis, the Carbon Allotropes considered are Graphene Nanoribbon (GNR), 2-dimensional Graphene sheet, and Carbon Nanotubes (CNT). The Boltzmann transport equation (BTE) and the phonon kinetic equation (PKE) were used. All results were analysed numerically and graphically presented. Using BTE for Armchair...
ABSTRACT Potable water supply in Ado-Ekiti is inadequate resulting in increased demand for groundwater in the metropolis. Geologically, Ado-Ekiti is underlain by hydrogeologically challenging crystalline basement rocks whose hydraulic properties are characterised by extreme variations over short distances. Prospective groundwater zones are poorly defined in the hard rock terrain. A thorough and definitive evaluation of the overall groundwater resource in such terrain is imperative. This study...
ABSTRACT The use of chemical fertilizers to replenish depleted soil nutrients due to over cultivation and erosion is a common practice. Natural radionuclides in these fertilizers can cause some radiological adverse health effects to animal, through indirect ingestion of fertilizer, including consumption of plants grown with fertilizers. Information on the level of contribution of chemical fertilizers to farm soil radioactivity and radiological health effects in Nigeria are scanty. This study ...
ABSTRACT Pneumatic Transfer System (PTS) is an auxiliary system of Ghana Research Reactor -1 (GHARR-1) to transfer sample capsule in and out of the reactor irradiation sites. The PTS controller unit design and construction was carried out because the transfer system was not designed to operate in cyclic Neutron Activation Analysis (NAA) and as a result could not determine radionuclides whose half-lives are equal or less than 100 seconds. In addition, most of the components used to design th...
ABSTRACT This paper presents the relationship between thermo f7hysical properties (thermal conductivity and thermal diffusivity) and heavy metal concentration of some surface clay from six local governments in Ibaaun, oyo state, Nigeria. An atomic absorption spectrometer (AAS) 1i1i)as used in analping the concentration of heavy metals present in each sample by .measuring the intensity of external radiation absorbed by the atom produced from the same sample at a wavelength characteristic to th...
ABSTRACT The Boltzmann kinetic equation was used to investigate and derived theoretically the current density characteristics of carbon nanotubes exposed simultaneously to both constant (dc) and high-frequency (ac) electromagnetic fields. Generation and amplification of terahertz radiation at room temperature was predicted. We demonstrated that this can suppress electric current instabilities while still preserving a broadband THz gain. We have further shown that THz gain in the conditions o...
ABSTRACT A three-dimensional (3D) laser imaging system based on digital holography has been used as a tool for testing digital holography (DH) in the infrared (IR) range in several configurations; transmission and reflection mode. The feasibility of digital holography in the infrared region was demonstrated using two beam interferometric technique for recording holograms both in reflection and transmission type geometry which employs a pyroelectric sensor array detector. The materials used ...
ABSTRACT Leaf area measurement can be a time consuming process and may require sophisticated electronic instruments. The objective of this research was to develop a simple, and less time consuming method for leaf area (LA) estimation of some leaves of cassava varieties. A method based on the beta mass absorption coefficient of the leaf has been developed and used for the estimation of leaf area of three varieties of cassava and the accuracy and precision of this method has been compared with ...
ABSTRACT The movement of contaminated fluid from a solid waste landfill into a portable water aquifier located beneath is an example of underground flow.
ABSTRACT The phenomenon of detection of flow of water in porous media of different porosities with porosity ratio, is similar to the fact that there is deviation in fluid flow in a pair of media of different densities.
ABSTRACT A simple inexpensive chemical route has been identified and used to synthesize cupric oxide nanoparticles suitable for photovoltaic applications. X-ray diffraction analysis showed the synthesized nanoparticles to be a pure cupric oxide phase. The particle size and particle size distribution of the cupric oxide nanoparticles were obtained by transmission electron microscopy (TEM) whereas the crystallite size and crystallite size distribution were obtained by X-ray diffraction peak bro...
ABSTRACT Geophysical method was used to investigate the effects of Aba-Eku public refuse dumpsite in Ibadan on groundwater quality.
ABSTRACT Background: Health-Related Quality of Life is a multidimensional construct referring to patient’s perception of the impact of disease and treatment on their physical, psychological, social function and wellbeing. HIV and Tuberculosis are two diseases of public health importance and there is paucity of data on the quality of life of patients who suffer from these diseases in Nigeria. This study was carried out to measure, compare and identify factors affecting health-related quality...
ABSTRACT The aim of the study was to measure the entrance surface dose for selected diagnostic Xray examinations using calibrated thermoluminescent dosimeters on an anthropomorphic phantom. Dose measurement obtained with PCXMC software calculations were used to estimate the stochastic radiation risks and age-dependent mortality rates for subsequent assessment of lifetime cancer risk. Entrance surface dose per examination was estimated from X-ray tube output parameters in two digital X-ray uni...
Abstract. We briefly present the motivation, architecture and usage experience as well as proof statistics for a new Rodin Platform proof back-end based on the Why3 umbrella prover. Why3 offers a simple and versatile notation as a common interface to a large number of automated provers including all the leading SMT-LIB and TPTP compliant tools. The plug-in can function either in a local mode when all the provers are installed locally, or remotely as a cloud service. We discuss the experience ...