University of Cape Coast Institutional Repository

Browsing Department of Physics by Author "Mensah, S. Y."

Browsing Department of Physics by Author "Mensah, S. Y."

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  • Absorption of acoustic phonons in fluorinated carbon nanotubes with non-parabolic, double periodic band 
    Sekyi-Arthur, D.; Mensah, S. Y.; Mensah, N. G.; Dompreh, K. A.; Edziah, R. (University of Cape Coast, 2016)
    We studied theoretically the absorption of acoustic phonons in the hypersound regime in Fluorine modified Carbon Nanotube (F-CNT) ΓF –CNT and compared it to that of undoped Single Walled Nanotube (SWNT) ΓSW NT .Per the ...
  • Acoustoelectric effect in degenerate carbon nanotube 
    Dompreh, K. A.; Mensah, N. G.; Mensah, S. Y.; Sam, F.; Twum, A.K. T (University of Cape Coast, 2015)
    Acoustoelectric Effect AE in degenerate Carbon Nanotube (CNT) was theoretically studied for hypersound in the regime ql >> 1. The dependence of acoustoelectric current jac on the acoustic wave number ~ and frequency ωq at ...
  • Acoustoelectric effect in fluorinated carbon nanotube in the absence of external electric field 
    Sakyi-Arthur, D.; Mensah, S. Y.; Adu, K. W.; Dompreh, K. A.; Edziah, R.; Mensah, N. G (University of Cape Coast, 2020-01-23)
    Acoustoelectric effect (AE) in a non-degenerate Fluorine modified single walled carbon nanotube (FSWCNT) semiconductor is studied theoretically using the Boltzmann’s transport equation. The study is done in the hyper sound ...
  • Acoustoelectric effect in Graphene with degenerate energy dispersion 
    Dompreh, K. A.; Mensah, N. G.; Mensah, S. Y. (University of Cape Coast, 2015)
    The acoustoelectric effect AE in Graphene with degenerate energy dispersion is theoretically studied for hypersound in the regime ql >> 1. At low temperatures (kβT << 1), the non-linear dependence of Acoustoelectric current ...
  • Amplification of acoustic waves in armchair graphene nanoribbon in the presence of external electric and magnetic field 
    Dompreh, K. A.; Mensah, S. Y.; Abukari, S. S.; Sam, F.; Mensah, N. G. (University of Cape Coast, 2015)
    Amplification of Acoustic Waves in Armchair Graphene Nanoribbon (AGNR) in the presence of an external Electric and Magnetic field was studied using the Boltzmann’s kinetic equation. The general expression for the Amplification ...
  • Amplification of hypersound in graphene with degenerate energy dispersion 
    Dompreh, K. A.; Mensah, N. G.; Mensah, S. Y. (University of Cape Coast, 2015)
    Hypersound amplification/absorption of acoustic phonons in Graphene with degenerate energy dispersion ε(p) near the Fermi level was theoretically studied. For kβT << 1 and ql >> 1, the dependence of the absorption coefficient ...
  • Anomalous viscosity of vortex hall states in graphenea) 
    Rabiu, M.; Mensah, S. Y.; Ibrahim, S. Y.; Abukari, S. S. (University of Cape Coast, 2015)
    We study temperature effect on anomalous viscosity of Graphene Hall fluid within quantum many vortex hydrodynamics. The commonly observed filling fractions, ν in the range 0 < ν < 2 is considered. An expression for anomalous ...
  • Appearance of negative differential conductivity in graphene nanoribbons at high-harmonicsa) 
    Rabiu, M.; Mensah, S. Y.; Abukari, S. S. (University of Cape Coast, 2012)
    We theoretically study current dynamics of graphene nanoribbons subject to bias dc and ac driven fields. We showed that graphene nanoribbons exhibit negative high-harmonic differential conductivity. Negative differential ...
  • Behaviour of hot electrons under the dc field in chiral carbon nanotubes 
    Amekpewu, M.; Dompreh, K. A.; Mensah, S. Y.; Mensah, N. G.; Abukari, S. S.; Musah, R.; Twum, A.; Edziah, R. (University of Cape Coast, 2016)
    Behaviour of hot electrons under the influence of dc field in carbon nanotubes is theoretically considered. The study was done semi-classically by solving Boltzmann transport equation with the presence of the hot electrons ...
  • Determination of standard reference body indices for clinical application in Ghana 
    Issahaku, Shirazu; Mensah, Y. B; Schandorf, Cyril; Mensah, S. Y. (University of Cape Coast, 2017)
    The study is tailored to measure body height and weight in order to estimate local base standard reference body surface area, body surface index and body mass index (BSA, BSI and BMI) in Ghana for clinical application. The ...
  • 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, ...
  • 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 ...
  • Ground state energy of a polaron in a superlattice 
    Mensah, S. Y.; Allotey, F. K. A.; Nkrumah, G.; Mensah, N. G. (University of Cape Coast, 2000)
    The ground state energy of a polaron in a superlattice was calculated using the double-time Green functions. The effective mass of the polaron along the lanes perpendicular to the superlattice axis was also calculated. The ...
  • High frequency conductivity in carbon nanotubes 
    Abukari, S. S.; Mensah, S. Y.; Mensah, N. G.; Adu, K. A.; Rabiu, M.; Twum, A. (University of Cape Coast, 2012-12-05)
    We report on theoretical analysis of high frequency conductivity in carbon nanotubes. Using the kinetic equation with constant relaxation time, an analytical expression for the complex conductivity is obtained. The real ...
  • High frequency conductivity in carbon nanotubes 
    Abukari, S. S.; Mensah, S. Y.; Mensah, N. G.; Adu, K. A.; Rabiu, M.; Twum, A. (University of Cape Coast, 2012-12-05)
    We report on theoretical analysis of high frequency conductivity in carbon nanotubes. Using the kinetic equation with constant relaxation time, an analytical expression for the complex conductivity is obtained. The real ...
  • High frequency conductivity of hot electrons in carbon nanotubes 
    Amekpewua, M.; Mensah, S. Y.; Musah, R.; Mensah, N. G.; Abukari, S. S.; Dompreh, K. A. (University of Cape Coast, 2015)
    High frequency conductivity of hot electrons in undoped single walled achiral carbon nanotubes (CNTs) under the influence of ac-dc driven fields is considered. We investigated semi classically by solving the Boltzmann’s ...
  • Hot electrons injection in carbon nanotubes under the influence of quasi-static ac-field 
    Amekpewu, M.; Mensah, S. Y.; Musaha, R.; Mensah, N. G.; Abukari, S. S.; Dompreh, K. A. (University of Cape Coast, 2015)
    Hot electrons injection in carbon nanotubes (CNTs ) where in addition to applied dc field (E), there exist simultaneously a quasi-static ac electric field (i.e. when the frequency ω of ac field is much less than the ...
  • Hydrodynamic study of edge spin-vortex excitations of fractional quantum hall fluid 
    Rabiu, M.; Mensah, S. Y.; Seini, I. Y.; Abukari, S. S. (University of Cape Coast, 2018)
    We undertake a theoretical study of edge spin-vortex excitations in fractional quantum Hall fluid. This is done in view of quantised Euler hydrodynamics theory. The dispersions of true excitations for fractions within 0 ≤ ...
  • Hypersound absorption of acoustic phonons in a degenerate carbon nanotube 
    Dompreh, K. A.; Mensah, N. G.; Mensah, S. Y.; Abukari, S. S.; Sam, F.; Edziah, R. (University of Cape Coast, 2015)
    Absorption of acoustic phonons was studied in degenerate Carbon Nanotube (i.e. where the electrons are found close to the Fermi level). The calculation of the hypersound absorption coefficient (Γ) was done in the regime ...
  • Laser stimulated thermal conductivity in chiral carbon nanotube 
    Twum, A.; Mensah, S. Y.; Mensah, N. G.; Dompreh, K. A.; Abukari, S.S.; Rabiu, M. (University of Cape Coast, 2012-08-04)
    An investigation of laser stimulated thermal conductivity in chiral CNT is presented. The thermal conductivity of a chiral CNT is calculated using a tractable analytical approach. This is done by solving the Boltzmann ...

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