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Science: Recent submissions

  • Development and evaluation of a calibration procedure for a 2D accelerometer as a tilt and vibration sensor 
    Hewawasam, K.; Hiran H. E. Jayaweera; Ranatunga, C. L.; Ariyaratne, T. R. (2009)
    Measuring tilt and vibration are two of the major applications of accelerometers. An experimental method to calibrate a commercially available 2D accelerometer (ADXL202JQC) as a tilt and a vibration measuring device ...
  • Thin-layer drying of some Sri Lankan paddy varieties under low humid conditions 
    Shyamali, A.K.; Hiran H. E. Jayaweera; Ariyaratne, T.R. (2009)
    Thin-layer drying characteristics of paddy were examined within the relative humidity range from 30% to 60%. A test chamber has been constructed with Perspex and continuously flushed with low humid air to control ...
  • Effect of measurement of non-destructive firmness on Tomato quality and comparison with destructive methods 
    Ranatunga, C.L.; Hiran H. E. Jayaweera; Suraweera, S.K.K.; Ariyaratne, T.R. (2009)
    Almost all instrumental non-destructive (ND) type firmness test methods which involve a physical contact with the tomato when used for testing, deliver at least a minute damage to the fruit. The damage induced on a ...
  • Vibration Effects in Vehicular Road Transportation 
    Ranathunga, C. L.; Hiran H. E. Jayaweera; Suraweera, S. K. K.; Wattage, S. C.; Ruvinda, K. K. D. L.; Ariyaratne, T. R. (2010)
    This study focuses to certain elements of th e Road-Vehicle-Load system which are responsible for the inflicted damage to consignment during road transportation. Bruising injury depends on the energy absorbed by the ...
  • Construction and Evaluation of a Dr ying Chamber Powered by Parabolic Trough Solar Concentrator for Drying of Agricultural and Other Materials 
    Ruvinda, K. K. D. L.; Suraweera, S. K. K.; Hiran H. E. Jayaweera; Ranasinghe, O. K.; Ariyaratne, T. R. (2011)
    This work reports a design and construction of a drying chamber powered by parabolic trough solar concentrator. The construc ted drying chamber is made of thin aluminum sheet material with two compartments; one is ...
  • Server Room Monitoring System Capa ble of Remote Status Querying and Remote Administrating 
    Kumara, D.M.D.D.P.; Thiruparan, B.; Hiran H. E. Jayaweera; Ariyaratne, T.R. (2011)
    Development of a standalone device together with three application software in different platform for server room environment monito ring is reported. The developed hardware is connected to different sensor networks ...
  • Development of a chlorophyll sensor based on absorbance and fluorescence measurers 
    de Silva, G.L.T.T.; Hiran H. E. Jayaweera (2015)
    An optical chlorophyll sensor has been developed by employing its unique light absorption and fluorescence properties . Characteristic absorption peaks of chlorophyll a and b occur at 430 nm and 453 nm ...
  • Machine Counting of Malaria Infected Blood Cells Using RGB Images 
    Wijesinghe, W.D.P.; Hiran H. E. Jayaweera (2015)
    The most widely used laboratory confirmation technique for malaria is visual inspection of Giemsa stained blood smears on microscope. A detection and counting method for malaria infected blood cells in a colour (RGB) ...
  • Thermodynamic investigation of solar energy conversion into work 
    Dayanga, W.T.T.; Gamalath, K.A.I.L.W. (2008)
    Using a simple thermodynamic upper bound efficiency model for the conversion of solar energy into work, the best material for a converter was obtained. Modifying the existing detailed terrestrial application model of direct ...
  • Theoretical Approach to the Physics of Fuel Cells 
    Wijewardena, Gamalath K.A.I.L; Peiris, B.M.P. (2012)
    Ion transport rate of PAFC, AFC, PEMFC, DMFC and SOFC fuel cells under the influence of an electric field and concentration gradient were evaluated for static electrolytes. AFC are the best fuel cells for higher current ...
  • The changing shape of a liquid drop in an electric field 
    Jayalal, A.A.S.N; Wijewardena, Gamalath K.A.I.L. (2012)
    An approximate extension of the slender body theory was used to determine the static shape of a conically ended dielectric fluid drop in an electric field. Using induced surface charge density, hydrostatic pressure and the ...
  • Strain distributions in group IV and III-V semiconductor quantum dots 
    Wijewardena Gamalath, K. A. I. L.; Fernando, M. A. I. P. (2009)
    A theoretical model was developed using Green’s function with an anisotropic elastic tensor to study the strain distribution in and around three dimensional semiconductor pyramidal quantum dots formed from group IV and ...
  • Relativistic calculations of secondary ions produced in plasma desorption mass spectrometry 
    Yoosoofmiya, R.M.; Gamalath, K.A.I.L.W. (2003)
    In Time of Flight (TOF) mass spectrometry, the ratio; mass/charge of ions of the sample under investigation is determined by a relationship between time of flight and spectrometer parameters. Usually this relationship is ...
  • Oscillatory polarization potential induced at a surface by a penetrating charge 
    Eriksson, H. G.; Karlsson, B. R.; Wijewardena, K. A. I. L. (1985)
    Considering a uniformly moving, swift charge entering a semi-infinite dielectric medium, the polarization potential at the surface is studied using a standard macroscopic and quasistatic model. The bulk dielectric function ...
  • On the Complementary Wave Interpretation of the Dirac Equation 
    Bulathsinghala, D. L.; Wijewardena, Gamalath K. A. I. L. (2013)
    The Dirac equation consistent with the principles of quantum mechanics and the special theory of relativity, introduces a set of matrices combined with the wave function of a particle in motion to give rise to the relativistic ...
  • Monte Carlo Simulation of Polymer Solar Cells 
    Panapitiya, G.U.; Wijewardena, Gamalath K.A.I.L (2011)
    Monte Carlo method was successfully employed to study the mechanism inside a three dimensional bulk hetero-junction polymer solar cell using a model based on a novel architecture of adjustable structural parameters, The ...
  • Modeling of planar plasma diode 
    Wijewardena, Gamalath K. A. I. L; Samarakoon, A. M. (2013)
    To investigate the dynamics of a planar plasma diode system (PDS), a model based on the current density equilibrium at the interface was developed. The current densities and plasma boundary variations with the potential ...
  • First-principles investigation of BaFe2As2(001) 
    Profeta, G.; Franchini, C.; Gamalath, K.A.I.L.W.; Continenza, A. (2010)
    The structural, electronic, and magnetic properties of several different terminations of the BaFe2As2(001) surface are investigated by means of first-principles calculations. Analysis of the surface stability as a function of ...
  • Diffraction of light by acoustic waves in liquids 
    Wijewardena, Gamalath K.A.I.L; Jayawardena, G.L.A.U (2012)
    For the acusto-optic interactions in liquids, an equation for the diffraction light intensity was obtained in terms of Klein Cook parameter Q. With optimized parameters for Q, incident light wave length of _=633 nm, sound ...
  • Adsorption on CdTe and HgTe Surfaces 
    Wijewardena, K.A.I.L; Szymanski, J; Neilson, D (1988)
    SYNOPISIS. To investigate the change in the surface properties of cadmium telluride when an atom is adsorbed onto a cadmium or mercury telluride when an atom is adsorbed onto a cadmium or mercury terminated (111) surface, ...

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