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Browsing SCHOOL OF PHYSICAL SCIENCE by Issue Date

Browsing SCHOOL OF PHYSICAL SCIENCE by Issue Date

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  • Laser-induced fluorescence spectroscopy (lifs) - a non-destructive method to detect tissue browning 
    Wulf, Janina S.; Herppich, Werner B.; Geyer, Martin; Zude, Manuela (University of Cape Coast, 2000)
    Laser-induced fluorescence spectroscopy (LIFS) was non-destructively applied on sound and bruised apples. Furthermore, the technique was tested to measure surface browning of freshly cut banana slices, which were treated ...
  • Temperature dependence of the thermal conductivity of single-wall carbon nanotubes 
    Osman, Mohamed A; Srivastava, Deepak (University of Cape Coast, 2000)
    The thermal conductivity of several single-wall carbon nanotubes has been calculated over a temperature range of 100–500 K using molecular dynamics simulations with the Tersoff–Brenner potential for C–C interactions. In ...
  • 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 ...
  • Physico-Chemical and microbial water quality assessment of Densu River of Ghana 
    Karikari, A.Y.; Ansa-Asare, O. D. (University of Cape Coast, 2000)
    Water quality assessment conducted in the Densu basin of Ghana between July 2003 and March 2004 identified human, animal and agricultural activities as the main sources of pollution. The pH of the water was neutral (pH ...
  • Differential thermopower of a CNT chiral carbon nanotube 
    Mensah, S Y; Allotey, FKA; Mensah, N G; Nkrumah, G (University of Cape Coast, 2000)
    The differential thermo power of a chiral carbon nanotube (CNT) was calculated using a tractable analytical approach. We obtained an expression for the electrical conductivity σ and the thermopower α. The results were ...
  • 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 ...
  • Nonlinear acoustoelectric effect in a semiconductor superlattice 
    Mensah, S Y; Allotey, F.K.A; Mensah, N. G. (University of Cape Coast, 2000)
    The acoustoelectric effect in a semiconductor superlattice (SL) has been studied for a hypersound in the region ql 1 (where q is the acoustic wave number and l is the electron mean free path). A nonlinear dependence of ...
  • 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 ...
  • Development of an ion-channel sensor for heparin detection 
    Gadzekpo, Victor P.Y.; Bühlmann, Philippe; Xiao, Kang Ping; Aoki, Hiroshi; Umezawa, Yoshio (University of Cape Coast, 2000)
    The ion-channel sensor technique was used to determine heparin concentrations in artifcial and horse serum with cyclic voltammetry. The sensor is based on self-assembled monolayers (SAMs) of thioctic acid on which rotamine ...
  • Physico-Chemical and microbial water quality assessment of Densu River of Ghana 
    Karikari, A. Y.; Ansa-Asare, O. D. (University of Cape Coast, 2000)
    Water quality assessment conducted in the Densu basin of Ghana between July 2003 and March 2004 identified human, animal and agricultural activities as the main sources of pollution. The pH of the water was neutral (pH ...
  • 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 ...
  • Introduction to HVDC technology for reliable electrical power systems 
    Setreus, Johan; Bertling, Lina (University of Cape Coast, 2002)
    The transmission system is becoming ever more complex. Furthermore, demand for reliable supply of electricity is growing, increasing the need for a higher level of system reliability. A solution might be to incorporate ...

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