Browsing Department of Physics by Title

Browsing Department of Physics by Title

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  • Feasibility of Sound Touch Elastography Technique to Detect Fibrosis in Chronic Kidney Disease 
    Bandara, Muditha S; Jayathilake, Champika; Pallewatte, Aruna; Wansapura, Janaka (Peradeniya University International Research Sessions, 2021)
    Ultrasound (US) Elastography is a technique that uses low-frequency vibrations to measure the stiffness of the tissues. Liver elastography has shown the appropriability of detecting liver fibrosis which is considered to ...
  • First measurement of large area jet transverse momentum spectra in heavy-ion collisions 
    Jayananda, M.K.; Sonnadara, D.U.J.; Wickramaratne, D.D.C. (2021)
    Jet production in lead-lead (PbPb) and proton-proton (pp) collisions at a nucleon-nucleon center-of-mass energy of 5.02TeV is studied with the CMS detector at the LHC, using PbPb and pp data samples corresponding to ...
  • 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 ...
  • Forecasting Droughts Using Artificial Neural Networks 
    Ileperuma, Gayan; Sonnadara, D.U.J. (2009)
    This study was carried out to examine the possibility of using artificial neural networks as a tool to forecast droughts in Sri Lanka. Predictions were made using the Standardized Precipitation Index (SPI) as the drought ...
  • Forecasting the Occurrence of Rainfall in Selected Weather Stations in the Wet and Dry Zones of Sri Lanka 
    Perera, H.K.W.I.; Sonnadara, D.U.J.; Jayewardene, D.R. (2002)
    Two models were developed based on the Markov method to predict the occurrence of rainfall. Daily rainfall data from 9 meteorology stations in Sri Lanka namely, Colombo, Ratnapura, Kandy, Galle, Hambanthota, Batticaloa, ...
  • Fractal Analysis of Cloud Shapes 
    Madhushani, K.N.R.A.K.; Sonnadara, D.U.J. (2012)
    A study was carried out to investigate the fractal properties of cloud shapes. Water vapor images of clouds over the Indian Ocean region captured by the geostationary meteorological satellite METEOSAT-7 during the period ...
  • Fractal Analysis of Long Laboratory Sparks of high Speed Video Recordings 
    A Vayanganie; L Gunasekera; M Fernando; U Sonnadara; V Cooray; M Rahman; P Hettiarachchi; O Diaz (ICLP, 2016)
    Variation of fractal dimension of long laboratory sparks were studied using high speed video recordings and still images. Four sparks were selected for the study, including both positive and negative polarities in ...
  • Fractal characteristics of simulated electrical discharges 
    Amarasinghe, D.; Sonnadara, D.U.J. (2008)
    A two dimensional stochastic dielectric breakdown model was utilized in studying the fractal properties of simulated lightning discharges and surface discharges. The fractal dimension of the simulated growth patterns varied ...
  • Fractal dimension of long electrical discharges 
    Amarasinghe, D.; Sonnadara, D.U.J.; Berg, M.; Cooray, V. (Elsevier, 2015)
  • Fractal properties of long sparks 
    Amarasinghe, D.I.; Sonnadara, D.U.J. (2006)
    Two methods have been utilized to study the fractal nature of long laboratory sparks. The first method based on a statistical technique use the variation in angle between consecutive steps to deduce the fractal nature in ...
  • Framework for optimal pulse sequence design for balanced steady state free precession in magnetic resonance fingerprinting (MRF) 
    Iddagoda, M.; Jayaweera, H.H.E.; Wanaspura, J. (University of Colombo, 2020)
    Magnetic resonance fingerprinting is an emerging technique that allows for a non-invasive quantification of multiple tissue properties by using a set of acquisition pulses. To accurately classify the tissue properties, ...
  • Frequency Analysis of Thunder Features 
    R Abeywardhana; M Fernando; U Sonnadara; V Cooray (ICLP, 2016)
    Acoustic signatures of thunder can be used in understanding some properties of lightning channels. Basic features of thunder signal are qualitatively classified as Peals, Claps and Rumble. In studies [1] and [4], attempts ...
  • Fuzzy Signal Light Control System for Pedestrian Crossings 
    Wannige, C.T.; Sonnadara, D.U.J. (2009)
    In this article, we bring forward a fuzzy signal light control system for Pedestrian Crossings with the scope of minimizing delay experienced by drivers and pedestrians at signal crossings. Here, we use a fuzzy logic system ...
  • Gas spectroscopy and optical path-length assessment in scattering media using a frequency-modulated continuous-wave diode laser 
    Mei, Liang; Hiran H. E. Jayaweera; Svanberg, Sune; Somesfalean, Gabriel (2011)
    Simultaneous assessment of the spectroscopic absorption signal of gas enclosed in a scattering medium and the corresponding optical path length of the probing light is demonstrated using a single setup. Sensitive gas ...
  • Generative design of stable semiconductor materials using deep learning and density functional theory 
    Siriwardane, Edirisuriya M. Dilanga; Zhao, Young; Perera, Indika; Hu, Jianhu (NPJ Computational Materials, 2022)
    Semiconductor device technology has greatly developed in complexity since discovering the bipolar transistor. In this work, we developed a computational pipeline to discover stable semiconductors by combining generative ...
  • A Genetic Algorithm for University Timetabling 
    Abeywardena, K.; Illeperuma, G.D. (University of Colombo, 2021)
    Timetabling is the process of allocating time for planned activities orderly, to bring an optimum solution, without violating any hard constraints and with minimum soft constraint violations. It portrays a difficult ...
  • GPS based maritime boundary identification application for mobile phones 
    BM Safras; AA Ajmal; DUJ Sonnadara (SEUSL, 2018)
    ABSTRACT: Fishing is one of the main income sources for those who live in the coastal areas of Sri Lanka. Since most fishing boats do not carry navigational or radio equipment, they face the danger of going beyond the ...
  • Hardware Implementation of Random Number Generators 
    Wijesinghe, W.A.S.; Jayananda, M.K.; Sonnadara, D.U.J. (2006)
    Random numbers are used in a wide variety of applications. True random number generators are slow and expensive for many applications while pseudo random number generators (RNG) suffice for most applications. Although a ...
  • High speed optical observations of cloud flashes 
    SPA Vayanganie; Mahendra Fernando; Sonnadara, D.U.J.; DC Perera; Vernon Cooray (IEEE, 2014)
    Abstract—Luminosity variations of natural cloud lightning channels were studied using high speed video recordings in Sri Lanka in the tropic. Five cloud flashes were selected for the study, which were recorded with 5000 ...
  • High speed optical observations of cloud flashes 
    Vayanganie, S.P.A.; Fernando, M.; Sonnadara, D.U.J.; Perera, D.C.; Cooray, V. (2014)
    Abstract—Luminosity variations of natural cloud lightning channels were studied using high speed video recordings in Sri Lanka in the tropic. Five cloud flashes were selected for the study, which were recorded with 5000 ...

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