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Department of Physics: Recent submissions

  • Traffic Signal Control Based on Adaptive Neuro-Fuzzy Inference 
    Wannige, C.T.; Sonnadara, D.U.J. (2008)
    An adaptive neuro-fuzzy inference system is developed and tested for traffic signal controlling. From a given input data set, the developed adaptive neuro-fuzzy inference system can draw the membership functions and ...
  • Simulation of Self Similar Random Trees 
    Jinasena, K.D.S.; Sonnadara, D.U.J. (2008)
    Trees are one beautiful creation of which has a very complex structure. However it can be seen that this complex structure is build as a combination of thousands of basic structures. Therefore trees can be defined in ...
  • Detecting and preventing plagiarism in online assessment 
    Wannige, C.T.; Sonnadara, D.U.J.; Usoof, H.A.; Hewagamage, K.P. (2008)
    Assessment is an important area in both teaching and learning. E-assessment is the foremost methodology for assessment in distance learning. This paper present a method based on client-server architecture that can be used ...
  • Relaxation of the structure of simple metal ion complexes in aqueous solutions at up to supercritical conditions 
    Mayanovic, Robert A.; Jayanetti, J. K. D. S.; Anderson, J.; Bassett, William A.; Chou, I-Ming (2003)
    Our previous x-ray absorption fine structure studies of aqueous solutions revealed relaxation of the structure of complexes of Zn21, Fe21, La31, and Yb31 ions with increasing temperature. These complexes in general exhibit ...
  • Analysis of radiation-induced small Cu particle cluster formation in aqueous CuCl2 
    Jayanetti, J. K. D. S.; Mayanovic, Robert A. (2001)
    Synchrotron x-ray radiation is being used extensively as a structure probe to investigate the coordination environment and thus gain insight into the ion–water and ion–ion interactions in aqueous solutions. However, under ...
  • X-ray spectroscopic investigations of fluids in the hydrothermal diamond anvil cell: The hydration structure of aqueous La3+ up to 300 ∞C and 1600 bars 
    Anderson, J.; Jayanetti, J. K. D. S.; Mayanovic, Robert A.; Bassett, William A.; Chou, I-Ming (2002)
    The first direct measurements are reported for the structure of the hydrated La3+ ion in an aqueous solution (containing 0.007 m La) over a range of temperatures from 25 to 300 ∞C and pressures up to 1600 bars. The radial ...
  • Performance Evaluation of Multipliers in Reconfigurable Hardware 
    Wijesinghe, W.A.S.; Jayananda, M.K.; Sonnadara, D.U.J. (2008)
    Hardware multiplier is a critical element in many computing intensive sub-systems that are implemented in Field Programmable Gate Arrays (FPGAs). In this study, performance comparison between several different types of ...
  • Modelling Free Flowing Vehicular Traffic Noise 
    Sooriyaarachchi, R.T.; Sonnadara, D.U.J. (2008)
    Traffic noise of 650 vehicles classified into 8 vehicle classes were measured in several locations within the Western Province of Sri Lanka in order to extract the necessary coefficients to develop a road traffic noise ...
  • 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 ...
  • Performance of an artificial neural network on forecasting the daily occurrence and annual depth of rainfall at a 
    Kumarasiri, A.D.; Sonnadara, D.U.J. (2008)
    Performance of a feed-forward back-propagation artificial neural network on forecasting the daily occurrence and annual depth of rainfall at a single meteorological station is presented. Both short term and long term ...
  • License Plate Identification Based on Image Processing Techniques 
    Wanniarachchi, W.K.I.L.; Sonnadara, D.U.J.; Jayananda, M.K. (2007)
    A License plate identification system can be used for numerous applications such as unattended parking lots, security control of restricted areas, traffic law enforcement and automatic toll collection. Such a system captures ...
  • Correlation between Brightness and Channel Currents of 
    Amarasinghe, D.; Sonnadara, D.U.J.; Berg, M.; Cooray, V. (2007)
    Channel brightness of 500 mm long electrical discharges were measured by analyzing a set of digitized images taken by 3 cameras placed symmetrically around a discharge gap at a radial distance of 200 cm from the axis of ...
  • Channel Tortuosity of Long Laboratory Sparks 
    Amarasinghe, D.; Sonnadara, D.U.J.; Berg, M.; Cooray, V. (2007)
    Channel tortuosity of 50 cm long laboratory sparks were measured by analyzing a set of images taken by three cameras. The cameras were placed at a radial distance of 200 cm from the spark gap. The angle between any two ...
  • Characteristics of cloud to ground lightning flashes 
    Sonnadara, D.U.J.; Cooray, V.; Gotsch, T. (2006)
    A detailed study on the characteristics of cloud-to-ground lightning flashes over Sweden was carried out for the period 1987 to 2000 using the data obtained from the Swedish lightning locating network. Results are presented ...
  • The Lightning Radiation Field Spectra of Cloud Flashes 
    Sonnadara, D.U.J.; Cooray, V.; Fernando, I.M.K. (2006)
    Electric radiation fields produced by lightning cloud flashes have been analyzed using Fourier methods to obtain amplitude spectra for frequencies in the range of 20 kHz to 20 MHz. Time to thunder measurements were used ...
  • Trends of Rainfall in Sri Lanka over the Last Century 
    Jayawardene, H.K.W.I.; Sonnadara, D.U.J.; Jayewardene, D.R. (2005)
    Utilizing over 100 years of rainfall records in 15 meteorology stations, an analysis was carried out to extract the trends of annual rainfall depth in Sri Lanka over the last century. A statistically significant increasing ...
  • Spatial interpolation of weekly rainfall depth in the dry zone of Sri Lanka 
    Jayawardene, H.K.W.I.; Sonnadara, D.U.J.; Jayewardene, D.R. (2005)
    Daily rainfall data recorded at 13 stations were analyzed to study the spatial patterns of rainfall in the dry zone of Sri Lanka. Principal component analysis was utilized to classify the dominant spatial regions. The first ...
  • Characteristics of chaotic pulse trains generated by Lightning flashes 
    Gomes, C.; Cooray, V.; Fernando, I.M.K.; Montano, R.; Sonnadara, D.U.J. (2004)
    Pulse trains of irregular pulse characteristics and erratic amplitudes are observed in lightning flashes. These are termed ‘‘chaotic pulse trains’’ in this study. The average width of the individual pulses of these pulse ...
  • Some Properties of Lightning Ground Flashes Observed in and around Sri Lanka, and their Seasonal Variations 
    Liyanage, J.P.; Sonnadara, D.U.J.; Fernando, I.M.K.; Weerasekera, A.B.; Lelwala, R.; Ariyaratne, T.R. (2002)
    Two lightning locating systems were utilised in obtaining the cloud-to-ground flash characteristics in Sri Lanka and in the surrounding area of the Indian Ocean. Over 5,000 flashes were recorded during the year 1999 covering ...
  • 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, ...

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