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SCHOOL OF PHYSICAL SCIENCE: Recent submissions

Now showing items 101-120 of 637

Amplification of terahertz radiation in carbon nanotubes

Abukari, Sulemana S.; Adu, Kofi W.; Mensah, Samuel Y.; Mensah, Natalia G.; Dompreh, Kwadwo A.; Twum, Anthony; Rabiu, Musah (University of Cape Coast, 2013-04-24)

We investigate theoretically the feasibility of amplification of terahertz radiation in aligned achiral carbon nanotubes, a zigzag (12,0) and an armchair (10,10) in comparison with a superlattice using a combination of a ...
General scattering mechanism and transport in graphene

Rabiu, M.; Mensah, S. Y.; Abukari, S. S. (University of Cape Coast, 2011)

Using quasi-time dependent semi-classical transport theory in RTA, we obtained coupled current equations in the presence of time varying field and based on general scattering mechanism τ ∝ Eβ .We find that close to the ...
Fungus covered insulator materials studied with laser-induced fluorescence and principal component analysis

Bengtsson, M.; Wallstroom, S.; Sjoholm, M.; Gronlund, R.; Anderson, B.; Larsson, A.; Karlsson, S.; Kroll, S.; Svanberg, S. (University of Cape Coast, 2005)

A method combining laser-induced fluorescence and principal component analysis to detect and discriminate between algal and fungal growth on insulator materials has been studied. Eight fungal cultures and four insulator ...
Fragmentation instabilities of a drop as it falls in a miscible fluid

Residori, S.; Buah-Bassuah, P.K.; Arecchi, F.T. (University of Cape Coast, 2007)

We review here a series of experiments on the fragmentation instabilities that a liquid drop undergoes it falls inside a fluid with which it is miscible, so called the solvent. Motivated by the original experiments initiated ...
Fragmentation of a drop as it falls in a lighter miscible fluid

Arecchi, F. T.; Buah-Bassuah, P. K.; Francini, F.; Residori, S. (University of Cape Coast, 1996)

We report an experimental investigation of the fragmentation process of a heavy drop falling in a lighter miscible fluid. For fixed liquid composition and for different drop sizes, we observe that the fragmentation cascade ...
Fragmentation instabilities of a liquid drop falling in a miscible fluid

Buah-Bassuah, P. K.; Residori, S.; Arecchi, F. T. (University of Cape Coast, 2014)

We report a set of experimental investigations on the break-up of a liquid drop when falling in a miscible solvent, with the density difference being positive, or negative, or zero. Non-dimensional numbers, derived from ...
Fragment formation in the break-up of a drop falling in a miscible liquid

Arecchi, F. T.; Buah-Bassuah, P. K.; Perez-Garc, C. (University of Cape Coast, 1991)

When falling in a lighter miscible solvent, a drop of liquid deforms to a torus which then breaks up into several fragments or just disappears by diffusion. By using liquids of different compositions we show the universal ...
Formation of laser-induced periodic surface structures during femtosecond laser ablation of highly oriented pyrolytic graphite (hopg)

Zhang, W.; Zhou, M.; Amoako, G.; Shao, Y-L.; Li, B-J.; Li, J.; Gao, C-Y. (University of Cape Coast, 2013)

Formation of laser-induced periodic surface structures (LIPSS) during femtosecond laser ablation of highly oriented pyrolytic graphite (HOPG) is investigated. Using a 1 kHz femtosecond pulses (pulse width 130 fs, centre ...
High electron thermal conductivity of chiral carbon nanotubes

Mensah, S.Y.; Allotey, F.K.A.; Nkrumah, George; Mensah, N.G. (University of Cape Coast, 2003)

Solving the Boltzmann kinetic equation with energy dispersion relation obtained in the tight binding approximation, the carrier thermal conductivity Ke of a chiral carbon nanotube (CCNT) was determined. The dependence of ...
Femtosecond laser structuring of materials: A review

Amoako, George (University of Cape Coast, 2019-04-03)

In this review the interaction between femtosecond laser and matter with emphasis on silicon and some metals have been appraised. For silicon, spikes are produced as a result of interaction in the presence of background ...
Feature based encryption technique for securing forensic biometric image data using aes and visual cryptography

Quist-Aphetsi, Kester; Laurent, Nana; Pascu, Anca Christine; Gire, Sophie; Eghan, J. M.; Quaynor, Nii Narku (University of Cape Coast, 2014)

with the current emergence of biometric image data applications on devices such as smart phones, security cameras, personal computers etc, there is a need for securing the image templates obtained from crime scenes as well ...
Feature based cryptanalytic technique for digital forensics analysis of visual cryptographic digital image data based on formal concept analysis

Quist-Aphetsi, Kester; Laurent, Nana; Pascu, Anca Christine; Gire, Sophie; Eghan, Jojo M.; Quaynor, Nii Narku (University of Cape Coast, 2015)

Lossless pixel value encrypted images still maintains the some properties of their respective original plain images. Ciphered Images that maintain the properties of their plain images of a given domain are very useful in ...
Feasibility study of the use of handheld nir spectrometer for simultaneous uthentication and quantification of quality parameters in intact pineapple fruits

Amuah, Charles L.; Teye, Ernest; Lamptey, Francis Padi; Nyandey, Kwasi; Opoku-Ansah, Jerry; Adueming, Peter Osei-Wusu (University of Cape Coast, 2019-08-06)

The potential of predicting maturity using total soluble solids (TSS) and identifying organic from inorganic pineapple fruits based on near-infrared (NIR) spectra fingerprints would be beneficial to farmers and consumers ...
Farmer’s observation on climate change impacts on maize (Zea mays) production in a selected agro ecological zone in Ghana

Klutse, Nama Ama Browne; Owusu, Kwadwo; Adukpo, David Cudjoe; Nkrumah, Francis; Quagraine, Kwesi (University of Cape Coast, 2013)

Although maize farmers may not have a clear understanding of climate change, they live close to natural resources and are among the first in perceiving and reacting to environmental changes. They have observed and felt the ...
Extra gonadal sclerosing stromal tumour in the transverse mesocolon

Mensah, Samuel; Kyei, Ishmael; Ohene –Yeboah, Michael; Adjei, Ernest (University of Cape Coast, 2016)

Sclerosing stromal tumour (SST) is a rare benign sex cord stromal tumour of the ovary. We report a case of sclerosing stromal tumour of the mesentery in a 32-year-old Para one who presented with intra abdominal mass, ...
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 ...

Now showing items 101-120 of 637

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