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COLLEGE OF AGRICULTURAL & NATURAL SCIENCES: Recent submissions

Now showing items 141-160 of 1334

External electric field effect on electrons transport in carbon canotubes

Abukari, Sulemana S.; Mensah, Samuel Y.; Rabiu, Musah; Adu, Kofi W.; Mensah, Natalia G.; Dompreh, Kwadwo A.; Twum, Anthony; Amekpewu, Matthew (University of Cape Coast, 2013)

We consider a simple model of carbon nanotubes (CNTs) subject to external electric field E(t). Using a tight-binding approximation for the description of energy bands of CNTs, together with the standard Boltzmann transport ...
Estimate of reference effective dose and renal dose during abdominal ct scan for dose optimization procedures in Ghana

Shirazu, Issahaku; Mensah, Y. B; Schandorf, Cyril; Mensah, S. Y. (University of Cape Coast, 2017)

The study is to estimate renal and effective dose during abdominal MDCT scan, using image data for dose optimization for purposes of radiation protection in Ghana. In addition dose influencing parameters including: CTDIVOL, ...
Epithermal instrumental neutron activation analysis technique in determining bromine, chlorine, and Iodine in Sarotherodon Melanotheron from the Benya Lagoon, Ghana

Vowotor, M. K.; Sackey, S. S.; Amoako, G.; Sefa-Ntiri, B.; Amuah, C. L.Y.; Mireku, K. K. (University of Cape Coast, 2020)

Epithermal instrumental neutron activation analysis technique was applied in the determination of concentration levels of three halogens - bromine, chlorine, and iodine in Sarotherodon melanotheron (Blackchin tilapia). The ...
Entrance skin dose assessment of selected computed radiography facilities in Ghana

Gyan, E.; Inkoom, S.; Amoako, G. (University of Cape Coast, 2020)

The basic challenge with computed radiography (CR) systems is the large dynamic range which provides an opportunity for radiographers to gradually increase exposure factors and still produce good image quality, a practice ...
Simulation studies of plasmon enhanced evanescent near-field optical lithography

Sefa-Ntiri, B.; Docker, P.; Ward, M.C.; Prewett, P.D. (University of Cape Coast, 2005)

A finite element analysis (FEA) of surface lasmon polariton (SPP) assisted evanescent near field optical lithography (ENFOL) is described. A gold on silicon nitride nanostructured, low-stress, conformable mask is used to ...
Embedded metal mask enhanced evanescent near field optical lithography

Sefa-Ntiri, B.; Prewett, P.D. (University of Cape Coast, 2007)

Simulation of evanescent optical lithography using an embedded metal mask (EMM) shows that resolution and throughput are significantly enhanced over conventional ENFOL, due to coupling between surface plasmons and cavity ...
Electronic properties of single-walled chiral carbon nanotube electronic properties of single-walled chiral carbon nanotube

Mensah, S.Y.; Allotey, F.K.A.; Mensah, N.G.; Nkrumah, G. (University of Cape Coast, 2001)

The electronic properties of single-walled chiral carbon nanotube has been studied using the model based on infinitely long carbon atoms wrapped along a base helix of single-walled carbon nanotubes(SWNTs). The problem is ...
Electricity generation using a hybridized zeolite adsorption heat pump and heat engine

Labik, Linus Kweku; Kwakye-Awuah, Bright; Sefa-Ntiri, Baah; Abavare, Eric Kwabena Kyeh; Nkrumah, Isaac; Williams, Craig (University of Cape Coast, 2020-07-31)

The use of adsorption in Thermal Energy Storage has gained considerable research interest of late. Some applications have focused on the use of TES for transformation of low temperature heat in applications such as cooling ...
Effect of zeolite types ltx and lta on physicochemical parameters of drinking water samples in Ghana, assisted by light transmission experiment

Sefa-Ntiri, B.; Kwakye-Awuah, B.; Williams, C. (University of Cape Coast, 2014)

In this study, the effect of zeolite types LTX and LTA, assisted by laser light transmission experiment on the physico-chemical parameters of drinking water samples have been investigated. Water samples were collected from ...
Effect of laser on thermopower of chiral carbon nanotube

Mensah, S.Y.; Twum, A.; Mensah, N. G.; Dompreh, K. A.; Abukari, S. S.; Nkrumah-Buandoh, G (University of Cape Coast, 2000)

An investigation of laser stimulated thermopower in chiral CNT is presented. The thermopower of a chiral CNT is calculated using a tractable analytical approach. This is done by solving the Boltzman kinetic equation with ...
Effect of ionization of impurity centres by electric field on the conductivity of superlattice

Mensah, S.Y.; Allot, F.K.A.; Clement, A. (University of Cape Coast, 1994)

The study of the effect of ionization of impurity centres by electric field Ea on the conductivity of superlattice (SL) has been studied theoretically. It is observed that as the field Eo increases the current rises reaches ...
Effect of high frequency field on the transport properties of superlattice

Mensah, S.Y. (University of Cape Coast, 1992)

Theoretical study of the transport properties of semiconductor superlattice (SL) in the presence of external electric field E{t) has been investigated with the help of Boltz mann's equation. The model adopted agrees fairly ...
Effect of effective mass differences on the tunneling current-voltage behaviour of a resonant diode in the presence of space charge build-up

Sigalo, F.B.; Mensah, S.Y. (University of Cape Coast, 1992)

A theoretical study of the effect of differences in effective masses for electrodes and well, on the characteristics of tunneling current against bias voltage, in the presence of charge build-up has been done. It is observed ...
Green’s function studies of phonon transport across Si/Ge superlattices

Tian, Zhiting; Esfarjani, Keivan; Chen, Gang (University of Cape Coast, 2014)

Understanding and manipulating coherent phonon transport in solids is of interest both for enhancing the fundamental understanding of thermal transport as well as for many practical applications, including thermoelectrics. ...
Domain suppression in the negative differential conductivity region of carbon nanotubes by applied ac electric field

Abukari, Sulemana S.; Mensah, Samuel Y.; Adu, Kofi W.; Mensah, Natalia G.; Dompreh, Kwadwo A.; Twum, Anthony; Amuah, Chales L. Y.; Amekpewu, Matthew; Rabiu, Musah (University of Cape Coast, 2012)

We study theoretically the electron transport properties in achiral carbon nanotubes under the influence of an external electric field E(t) using Boltzmann’s transport equation to derive the current-density. A negative ...
DNA origami site-specific arrangement of gold nanoparticles

Amoako, George; Ye, Rian; Zhuang, Lizhou; Yang, Xiaohong; Shen, Zhiyong; Zhou, Ming (University of Cape Coast, 2013-08-14)

Controlling matter at the nanoscale holds a lot of promise in nanotechnology. The DNA origami is promising if used as a template to design and arrange matter at the nanoscale. We have used the DNA origami approach to ...
DNA origami as a tool to design asymmetric gold nanostructures

Amoako, George; Ming, Zhou; Eghan, Sackey; Sonko, Samuel (University of Cape Coast, 2017-12-06)

DNA origami technology provides a versatile approach for the chemical assembly of gold nanostructures. In this study the bottom-up approach of self-assembly using DNA in the origami process has been successfully applied ...
Dissolved organic matter in hand‑dug well water as groundwater quality indicator: Assessment using laser‑induced fluorescence spectroscopy and multivariate statistical techniques

Sefa‑Ntiri, B.; Kwakye‑Awuah, B.; Edziah, R.; Anderson, B.; Armah, F. A.; Mensah‑Amoah, P.; Sackey, S. S.; Sam, F.; Akyea, A. G.; Yunus, S.; Tatchie, E.; Nkansah, B. K.; Kumi, F. (University of Cape Coast, 2019)

In groundwater, dissolved organic matter (DOM), a complex material, is a contaminant of concern owing to its ability to influence water quality and stimulate microbial metabolism. Using a 445-nm diode laser-induced ...
Direct current generation in carbon nanotubes by terahertz field

Abukari, Sulemana S; Sam, Frederick; Mensah, Samuel Y.; Mensah, Natalia G.; Musah, Rabiu; Twum, Anthony; Amoah, Patrick M.; Owusu, Alfred (University of Cape Coast, 2016-02-29)

We report on a theoretical investigation of a direct current generation in carbon nanotubes (CNTs) that are stimulated axially by terahertz (THz) field. We consider the kinetic approach based on the semiclassical Boltzmann’s ...
Direct current generation due to wave mixing in zigzag carbon nanotubes

Abukari, S. S.; Mensah, S.Y.; Mensah, N. G.; Dompreh, K. A.; Twum, A.; Allotey, F. K. A. (University of Cape Coast, 2000)

Generation of direct current in zigzag carbon nanotubes due to harmonic mixing of two coherent electromagnetic waves is being considered. The electromagnetic waves have commensurate frequencies of Ω and Ω. The rectification ...

Now showing items 141-160 of 1334

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