University of Cape Coast Institutional Repository

Browsing Department of Physics by Author "Twum, Anthony"

Browsing Department of Physics by Author "Twum, Anthony"

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  • 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)
    We investigate theoretically the feasibility of amplification of terahertz radiation in aligned vachiral carbon nanotubes, a zigzag (12,0) and an armchair (10,10) in comparison with a super lattice using a combination of ...
  • 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 ...
  • Characterization of potential direct recharge in the gold mining district of South-Western Ghana using the hydrus-1d computer code 
    Sam, Frederick; Amoako, George; Sefa-Ntiri, Baah; Twum, Anthony; Mensah-Amoah, P.; Tellam, John (University of Cape Coast, 2018-07-18)
    The mean annual potential recharge rate to the ground water system in the Tarkwa gold mining district of South Western Ghana, has been estimated for the period 1977 to 2001 by analyzing precipitation recharge in response ...
  • Connecting DNA origami structures using the biotin streptavidin specific binding 
    Ming, Zhou A; Ye, Rian; Mensah-Amoah, Patric; Twum, Anthony; Sam, Frederick; Amoako, George (University of Cape Coast, 2015)
    This work made use of the strong interaction between biotin and streptavidin to connect designed DNA origami structures. The caDNAno software was used to design a 6 layer 3D origami cross-like structure. Selected DNA strands ...
  • Direct current generation in carbon nanotubes by terahertz field 
    Abukari, Sulemana S; Sam, Frederick; Mensah, Samuel Y.; Mensah, Natalia G.; Musah, Rabiu; Twum, Anthony; Amoah, Patrick M.; Owusu, Alfred (University of Cape Coast, 2016-02-29)
    We report on a theoretical investigation of a direct current generation in carbon nanotubes (CNTs) that are stimulated axially by terahertz (THz) field. We consider the kinetic approach based on the semiclassical Boltzmann’s ...
  • Domain suppression in the negative differential conductivity region of carbon nanotubes by applied ac electric field 
    Abukari, Sulemana S.; Mensah, Samuel Y.; Adu, Kofi W.; Mensah, Natalia G.; Dompreh, Kwadwo A.; Twum, Anthony; Amuah, Chales L. Y.; Amekpewu, Matthew; Rabiu, Musah (University of Cape Coast, 2012)
    We study theoretically the electron transport properties in achiral carbon nanotubes under the influence of an external electric field E(t) using Boltzmann’s transport equation to derive the current-density. A negative ...
  • External electric field effect on electrons transport in carbon canotubes 
    Abukari, Sulemana S.; Mensah, Samuel Y.; Rabiu, Musah; Adu, Kofi W.; Mensah, Natalia G.; Dompreh, Kwadwo A.; Twum, Anthony; Amekpewu, Matthew (University of Cape Coast, 2013)
    We consider a simple model of carbon nanotubes (CNTs) subject to external electric field E(t). Using a tight-binding approximation for the description of energy bands of CNTs, together with the standard Boltzmann transport ...
  • 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 ...
  • 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 ...
  • Laser induced resistivity of chiral single wall carbon nanotubes 
    Twum, Anthony; Mensah, Samuel Yeboah; Edziah, Raymond; Arthur, Augustine (University of Cape Coast, 2020-07-10)
    Using the Boltzmann transport equation within the semi-classical approximation with constant relaxation time, we theoretically studied the dynamics of electrons in chiral single wall nanotubes (SWNTs)subjected to a temperature ...
  • Rectification due to harmonic mixing of two coherent electromagnetic waves with commensurate frequencies in carbon nanotubes 
    Abukari, Sulemana S.; Adu, Kofi W.; Mensah, Samuel Y.; Mensah, Natalia G.; Rabiu, Musah; Twum, Anthony; Amekpewu, Mathew; Dompreh, Kwadwo A. (University of Cape Coast, 2013)
    We report on a theoretical investigation of carbon nanotubes subjected to a pure alternating electric field consisting of two phase-shifted harmonic fields of frequencies ω1 = Ω and ω2 = 2Ω (harmonic mixing) without any ...

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