UCC IR: Recent submissions

  • Induced hall-like current by acoustic phonons in semiconductor fluorinated carbon nanotube 
    Sakyi-Arthur, Daniel; Mensah, Samuel Y.; Adu, Kofi W.; Dompreh, Kwadwo A.; Edziah, Raymond; Mensah, Natalia G.; Jebuni-Adanu, Cynthia (University of Cape Coast, 2020-05-12)
    We show that Hall-like current can be induced by acoustic phonons in a nondegenerate, semiconductor fluorine-doped single-walled carbon nanotube (FSWCNT) using a tractable analytical approach in the hypersound regime q ...
  • Hypersound absorption of acoustic phonons in a degenerate carbon nanotube 
    Shmelev, G M; Mensah, S Y; Tsurkan, G I (University of Cape Coast, 1988)
    Short-wave sound absorption propagating along the axis of a semiconductor superlattice by electrons of the lowest miniband in a non-quantised electric field is investigated theoretically. The mechanism of the attenuation ...
  • 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 ...
  • 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 ≤ ...
  • 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 ...
  • High-Frequency Electric Field Induced Nonlinear Electron Transport in Chiral Carbon Nanotubes 
    Abukari, Sulemana S.; Mensah, Samuel Y.; Rabiu, Musah; Adu, Kofi W.; Mensah, Natalia G.; Twum, Anthony; Owusu, Alfred; Dompreh, Kwadwo A.; Mensah-Amoah, Patrick; Amekpewu, Matthew (University of Cape Coast, 2015-11-24)
    We investigate theoretically the high frequency complex conductivity in carbon nanotubes that are stimulated axially by a strong inhomogeneous electric field of the form Et t ) . Using the kinetic approach based on ...
  • High repetition-rate laser z-scan measurements: criterion for recognizing adverse thermal effects 
    Edziah, Raymond (University of Cape Coast, 2019-03-30)
    This study reports z-scan measurements in which high-repetition-rate and reduced repetition-rate (pulse-picked) laser beams were employed using a standard sample, carbon disulfide (CS2) contained in supposedly high ...
  • 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 ...
  • 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 ...
  • 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 ...
  • Giant electrical power factor in single-walled chiral carbon nanotube 
    Mensah, S.Y.; Allotey, F.K.A.; Mensah, N.G.; Nkrumah, G. (University of Cape Coast, 2001)
    Using the semiclassical approach we studied the thermoelectrical properties of a single-walled chiral carbon nanotubes (SWNTs). We predict a giant electrical power factor and hence proposed the use of carbon nanotubes as ...
  • Correlation between geological logs and geophysical logs to estimate aquifer positions in the crystalline basement rocks of the birimian system, Ghana 
    Nyako, Seth Owusu; Ofosu, Bernard; Opuni, Kwabena; Mensah, Festus Anane (University of Cape Coast, 2016)
    This study has enabled the lithological units intersected by a well, locate contacts of adjacent beds, locate depth to groundwater and determine the thickness of the units. Records of three geophysical logs parameters; ...
  • Generation and propagation of ultrasonic waves in piezoelectric graphene nanoribbon 
    Rabiu, Musah; Mensah, Samuel Y.; Abukari, Sulemana S.; Amekpewu, Matthew; Sefa-Ntiri, Baah; Twum, Anthony (University of Cape Coast, 2013)
    Generation and propagation of ultrasonic waves in single layer Graphene Nanoribbon is studied using semi-classical approach. When piezoelectric Graphene Nanoribbon (GNR) is exposed to time varying light beam, ultrasonic ...
  • Generation of terahertz radiation by wave mixing in armchair carbon nanotubes 
    Mensah, S.Y.; Abukari, S. S.; Mensah, N. G.; Dompreh, K. A.; Twum, A.; Allotey, F. K. A. (University of Cape Coast, 2000)
    Using semiclassical Boltzmann equation we have studied theoretically an effect of a direct current (DC) generation in undoped armchair carbon nanotube (CN) by mixing two coherent electromagnetic waves with commensurate ...
  • 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 ...