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Browsing Department of Physics by Title

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  • The negative differential effect in a semiconductor superlattice in the presence of an external electric field 
    Mensah, S Y (University of Cape Coast, 1992)
    Bollzmann's equation is solved for an clectmn m lhe lowest miniband of a superlattice semiconductor under the influence of an fxlemal electric field E(t). The currentdensity electric field characteristic shows a negalive ...
  • Negative high-harmonic differential conductivity in graphene nanoribbons 
    Rabiu, M.; Mensah, S. Y.; Abukari, S. S. (University of Cape Coast, 2012)
    We theoretically study current dynamics of graphene nanoribbons subject to bias and ac driven fields. We showed that graphene nanoribbons exhibit negative high-harmonic differential conductivity. Negative differential ...
  • A neural bag-of-words modelling framework for link prediction in knowledge bases with sparse connectivity 
    Kong, Fanshuang; Mensah, Samuel; Zhang, Richong; Guo, Hongyu; Hu, Zhiyuan; Mao, Yongyi (University of Cape Coast, 2019)
    Knowledge graphs such as DBPedia and Freebase contain sparse linkage connectivity, which poses severe challenge to link prediction between entities. In addressing this sparsity problem, our studies indicate that one needs ...
  • Neutron activation analysis as a tool to determine concentration of selected metals in table salt mined from Benya Lagoon, Ghana 
    Vowotor, Michael K.; Sackey, Samuel S.; Amuah, Charles L. Y.; Huzortey, Andrew; Ahorlu, Dennis M.; Kortey, Godwin; Kuvedzi, Dickson (University of Cape Coast, 2019)
    Table salt is essential for life and if it contains metal impurities, it can affect the people that consume it. The Komenda Edina Eguafo Abrem municipality makes salt by evaporating brine from the Benya Lagoon. Benya lagoon ...
  • A new cryptographic encryption algorithm for securing digital images 
    Quist-Aphetsi, Kester; Laurent, Nana; Pascu, Anca Christine; Gire, Sophie; Eghan, Jojo M.; Quaynor, Nii Narku (University of Cape Coast, 2014)
    This paper proposed a new algorithm for digital image encryption. The proposed algorithm encrypts an mxn size image by using the set of array pixel values. At the end, plain images will be encrypted using the algorithm and ...
  • Nonlinear acoustoelectric effect in a semiconductor superlattice 
    Mensah, S Y; Ahllotey, F.K.A; Mensah, N.G. (University of Cape Coast, 1999)
    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 ...
  • Nonlinear conductivity in graphene 
    Abukaria, S. S.; Mensah, S. Y.; Musah, R.; Mensah, N. G.; Dompreh, K. A. (University of Cape Coast, 2015)
    We consider the tight-binding approximation for the description of energy bands of graphene, together with the standard Boltzmanns transport equation and constant relaxation time, an expression for the conductivity was ...
  • 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 ...
  • A novel hybrid discrete cosine transformation and visual cryptographic technique for securing digital images 
    Quist-Aphetsi, Kester; Laurent, Nana; Pascu, Anca Christine; Gire, Sophie; Eghan, Jojo M.; Quaynor, Nii Narku (University of Cape Coast, 2015)
    Security of digital images in today’s cyber is a major concern. Transmission of compressed and uncompressed multimedia data is necessary for communication between different devices. Devices of different screen features and ...
  • On a liquid drop ”falling” in a heavier miscible fluid 
    Buah-Bassuah, Paul K.; Rojas, Rene; Residori, Stefania; Arecchi, F.T. (University of Cape Coast, 2005)
    We report a new type of drop instability, where the density difference between the drop and the solvent is negative. We show that the drop falls inside the solvent down to a minimum height, then fragmentation takes place ...
  • On the amplification of acoustic phonons in carbon nanotube 
    Dompreh, K. A.; Mensah, N. G.; Sakyi-Arthur, D.; Mensah, S. Y. (University of Cape Coast, 2016)
    We present a theoretical study of acoustic phonons amplification in Carbon Nanotubes (CNT). The phenomenon is via Cerenkov emission (CE) of acoustic phonons using intraband transitions proposed by Mensah et. al., [1] in ...
  • One-step real-image reflection holograms 
    Buah-Bassuah, Paul K; Vannoni, Maurizio; Molesini, Giuseppe (University of Cape Coast, 2017-02-21)
    A holographic process is presented where the object is made of the real image produced by a two-mirror system. Single-step reflection hologram recording is achieved. Details of the process are given, optics concepts are ...
  • Optical identification of plasmodium alciparum malarial byproduct for parasite density estimation 
    Opoku-Ansah, Jerry; Eghan, Moses Jojo; Anderson, Benjamin; Boampong, Johnson Nyarko; Edziah, Raymond; Adueming, Peter Osei-Wusu; Amuah, Charles Lloyd Yeboah (University of Cape Coast, 2019-11-11)
    Plasmodium alciparum (P. alciparum) malarial degree of infection, termed as parasite density (PD), estimation is ital for point of-care diagnosis and treatment of the disease. In this work, we present application of optical ...
  • Optical imaging method for determining symptoms severity of cassava mosaic disease 
    Anderson, Benjamin; Eghan, Moses Jojo; Asare-Bediako, Elvis; Buah-Bassuah, Paul Kingsley (University of Cape Coast, 2015-10-10)
    Cassava mosaic disease (CMD) is a major constraint to cassava production in cassava growing regions. Severity of CMD symptoms on cassava leaves is usually assessed visually using an arbitrary scale, which is semi-qualitative, ...
  • Opto-electronic system for displacement and vibration measurements 
    Francini, F.; Macchiarulo, M.; Tiribilli, B.; Buah-Bassuah, P. K. (University of Cape Coast, 1987)
    A device capable of measuring small displacements ~nd vibrati~ns o~ a n:oving body is .presented. A small mirror, firmly attached to the object unde~ mv.eStlgatlOn, defiect~ a paIr ~~laser beams onto two distinct photodetectors. ...
  • Performance evaluation of a deployed 4g Lte network 
    Tchao, E.T.; Gadze, J.D. (University of Cape Coast, 2018)
    In Ghana and many countries within Sub-Sahara Africa, Long Term Evolution (LTE) is being considered for use within the sectors of Governance, Energy distribution and transmission, Transport, Education and Health. Subscribers ...
  • Photo-degradation of microbes in hand-dug well-water using different radiation sources 
    Sackey, S. S.; Mensah-Amoah, P.; Amoako, G.; Vowotor, M. K.; Sefa-Ntiri, B.; Birikorang, E. (University of Cape Coast, 2019)
    Microbial bacteria in well-water have been treated using three different radiations and efficiency of treatment determined. The radiations were SUV (Sun with UV); SNoUV (Sun with NoUV, sun with UV portion filtered out) and ...
  • Photon-assisted process and high-harmonic dynamic localization in graphene nanoribbons 
    Musah, Rabiu (University of Cape Coast, 2012)
    We used a complete tight-binding band structure of grapheme nanoribbon to obtain, for the first time, analytical techniques for observing photon assisted transport, and dynamic localization of electrons in the graphene ...
  • Photothermal Lens Spectrometry Measurements in Highly Turbid Media 
    Marcano, Aristides; Basaldua, Isaac; Villette, Aaron; Edziah, Raymond; Liu, Jinjie; Ziane, Omar; Melikechia, Noureddine (University of Cape Coast, 2013)
    We measured the photothermal lens signal in samples exhibiting high turbidity using a pump-probe scheme. We show that the photothermal lens signal properties remain nearly unchanged up to values of turbidity of 6 cm1 despite ...
  • 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 ...

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