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Browsing Department of Physics by Title

Browsing Department of Physics by Title

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  • 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 ...
  • 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 ...
  • 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 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • Generation and amplification of terahertz radiation in carbon nanotubes 
    Abukaria, S. S.; Mensah, S.Y.; Mensah, N. G.; Adud, K. W.; Rabiu, M.; Dompreh, K. A.; Twum, A. (University of Cape Coast, 2012)
    We investigate theoretically the feasibility of generation and amplification of terahertz radiation in aligned achiral carbon nanotubes (zigzag and armchair) in comparison with a super lattice in the presence of a constant ...
  • 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 ...
  • 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 ...
  • Green’s function studies of phonon transport across Si/Ge superlattices 
    Tian, Zhiting; Esfarjani, Keivan; Chen, Gang (University of Cape Coast, 2014)
    Understanding and manipulating coherent phonon transport in solids is of interest both for enhancing the fundamental understanding of thermal transport as well as for many practical applications, including thermoelectrics. ...
  • 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 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 ...
  • 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 ...
  • 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 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 ...
  • 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 ...

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