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Browsing Department of Physics by Issue Date

Browsing Department of Physics by Issue Date

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  • 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 ...
  • Differential thermo power of a chiral carbon nanotube 
    Mensah, S.Y.; Allotey, F.K.A.; Mensah G., N.G.; Nkrumah, G (2000)
    Differential thermo power of a chiral carbon nanotube (CNT) was calculated using a tractable analytical approach. We obtained an expression for the electrical conductivity and the thermo power. The results were numerically ...
  • Negative differential conductivity in carbon nanotubes in the presence of an external electric field 
    Abukari, S. S.; Mensah, S.Y.; Mensah, N. G.; Adu, K.W.; Dompreh, K. A.; Twum, A. K. (University of Cape Coast, 2000)
    We study theoretically the electron transport properties in carbon nanotubes under the influence of an external electric field () using Boltzmann’s equation. The current-density equation is derived. Negative differential ...
  • The use of lorentz group formalism in solving polarization effects of a birefringent single mode optical fiber 
    Ishiekwene, G.C.; Brown, C.S.; Mensah, S.Y.; Bak, A.E. (University of Cape Coast, 2000)
    A theoretical analysis on the polarization effects of a light beam propagating in a birefrigent single-mode fiber is presented. We derive a system of differential equations representing the evolution of Stokes parameters ...
  • Polarization instability shift in birefringent single mode optical fibers 
    Ishiekwene, G.C.; Mensah, S.Y.; Brown, C.S. (University of Cape Coast, 2000)
    An intensity-dependent change in ellipticity of an input light beam leads to a characteristic shift in polarization instability. The presence of dichroism gives rise to self-induced ellipticity effect in the polarization ...
  • 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 ...
  • Surface tension effects in the zero gravity inflow of a drop into a fluid 
    Residori, S.; Pampaloni, E.; Buah-Bassuah, P.K.; Arecchi, F.T. (University of Cape Coast, 2000)
    As a drop of fluid is deposited on the surface of a miscible fluid (that we call the solvent), I tundergoes a strong pulling due to its surface rupture and it acquires a kinetic energy independently of gravity. For the ...
  • 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 ...
  • 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 ...
  • Nonlinear polarization effects in a birefringent single mode optical fiber 
    Ishiekwene, G.C.; Mensah, S.Y.; Brown, C.S. (University of Cape Coast, 2001)
    The nonlinear polarization effects in a birefringent single mode optical fiber are studied using Jacobi elliptic functions. We find that the polarization state of the propagating beam depends on the initial polarization ...
  • 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 ...
  • 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 ...
  • Sciamachy validation using ground-based doas measurements of the University of Bremen Bredom network 
    Richter, A.; Adukpo, D.; Fietkau, S.; Heckel, A.; Ladstätter-Weißenmayer, A.; Löwe, A.; Medeke, T.; Oetjen, H.; Wittrock, F.; Burrows, J. P. (University of Cape Coast, 2002)
    A network of ground-based UV/visible DOAS instruments operated by the University of Bremen is used to validate total column measurements from the SCIAMACHY instrument on ENVISAT from the tropics to the Arctic. Measurement ...
  • Amplification of acoustic phonons in a degenerate semiconductor superlattices 
    Mensah, S.Y.; Allotey, F.K.A.; Mensah, N.G.; Eloh, V.W. (University of Cape Coast, 2002)
    Amplification of acoustic phonons propagating along the axis of a semiconductor superlattice (SL) is investigated using the microscopic theory. A non-quantizing electric field is applied to the S to produce a drift velocity ...
  • Using violet laser-induced chlorophyll fluorescence emission spectra for crop yield assessment of cowpea (Vigna unguiculata (L) Walp) varieties 
    Anderson, Benjamin; Buah-Bassuah, Paul K; Tetteh, Jonathan P (University of Cape Coast, 2003)
    The use of violet laser-induced chlorophyll fluorescence (LICF) emission spectra to monitor the growth of five varieties of cowpea in the University of Cape Coast Botanical Garden is presented. Radiation from a continuous-wave ...
  • The influence of external electric field on acoustoelectric effect in a superlattice 
    Mensah, S.Y.; Allotey, F.K.A.; Mensah, N.G.; Akrobotu, H.; Nkrumah, G. (University of Cape Coast, 2003)
    The dc acoustoelectric current J" induced by the interaction of acoustic phonons with the conducting electrons is calculated. The calculation is done in the hypersound regime where q > I (here q is the acoustic phonon ...
  • 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 ...
  • Laser spectroscopy of free molecular oxygen dispersed in wood materials 
    Alnis, J.; Anderson, B.; Sjoholm, M.; Somesfalean, G.; Svanberg, S. (University of Cape Coast, 2003-09-30)
    The recently introduced Gas in Scattering Media Absorption Spectroscopy (GASMAS) technique is applied to the study of various wood samples. Molecular oxygen in the pores of the strongly scattering material is detected using ...
  • Chlorophyll fluorescence imaging of leaves and fruits1 
    Nedbal, ladislav20 (University of Cape Coast, 2004)
    Chlorophyll fluorescence imaging provides a powerful, non-invasive tool for investigating leaf photosynthesis under natural conditions. Applications of fluorescence imaging in plant research are increasing rapidly, ranging ...
  • PROMSAR: A backward Monte Carlo spherical RTM for the analysis of DOAS remote sensing measurements 
    Palazzi, E.; Petritoli, A.; Giovanelli, G.; Kostadinov, I.; Bortoli, D.; Ravegnani, F.; Sackey, S.S. (University of Cape Coast, 2004)
    A correct interpretation of diffuse solar radiation measurements made by Differential Optical Absorption Spectroscopy (DOAS) remote sensors require the use of radiative transfer models of the atmosphere. The simplest models ...

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