Department of Physics: Recent submissions

Now showing items 41-60 of 242

Estimating missing daily temperature extremes in Jaffna, Sri Lanka

Thevakaran, A.; Sonnadara, D.U.J. (Springer Vienna, 2018)
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 ...
Spatial Variability of Rainfall Trends in Sri Lanka from 1989 to 2019 as an Indication of Climate Change

Alahacoon, Niranga; Edirisinghe, C.M. (2021)

Analysis of long-term rainfall trends provides a wealth of information on effective crop planning and water resource management, and a better understanding of climate variability over time. This study reveals the spatial ...
Distribution of Lightning Accidents in Sri Lanka from 1974 to 2019 Using the DesInventar Database

Edirisinghe, C.M.; Maduranga, Uruvitiya Gamage Dilaj (2021)

The reported lightning accidents that are available in the DesInventar database—which consist of 549 deaths, 498 injured people, 39 destroyed houses, and 741 damaged houses—were analyzed in terms of their geographical and ...
Novel Handheld Device to Measure the Nasal Expiratory Flow Rate of the Two Nasal Cavities Individually and Simultaneously

Edirisinghe, C.M.; Thilakarathna, Thimira S. (2021)

This paper reveals a novel handheld device to measure the peak nasal expiratory flow rate of the two nasal cavities individually and simultaneously. Significantly, when using this device, the patient needs to inhale from ...
Satellite-Based Meteorological and Agricultural Drought Monitoring for Agricultural Sustainability in Sri Lanka

Alahacoon, Niranga; Edirisinghe, C.M.; Ranagalage, Manjula (2021)

For Sri Lanka, as an agricultural country, a methodical drought monitoring mechanism, including spatial and temporal variations, may significantly contribute to its agricultural sustainability. Investigating long-term ...
Trends in extreme rainfall events in Sri Lanka,1961–2010

Thevakaran, Arunasalam; Suppiah, Ramasamy; Sonnadara, D.U.J. (2019)

Many parts of Sri Lanka are vulnerable to extreme rainfall events leading to floods and droughts. This study was focused on a trend analysis of climate extremes derived from daily rainfall records. The daily rainfall data ...
Teaching English as a second language in Sri Lankan primary schools: opportunity and pedagogy

Little, Angela W.; Shojo, Mari; Sonnadara, D.U.J.; Aturupane, Harsha (Taylor & Francis Group, 2019)

Policy guidelines in Sri Lanka prescribe how and for how long English should be taught as a second language in primary education but practices on the ground may deviate. Opportunities for teaching and learning and ...
A Simulation Model for Interactive Tree Growth in a Complex Environment

Damith Jinasena; D.U.J. Sonnadara (University of Colombo, 2017)

Abstract This paper presents a dynamic modelling framework for simulating the growth of a tree with environment interactions which allows a tree to adapt to the distribution of light and proximity to solid obstacles. In ...
Climate Change Projections Over Sri Lanka

A Thevakaran; J. McGregor; J Katzfey; M Thatcher; R Suppiah; U Sonnadara (University of Colombo, 2017)

This paper investigates the future climate of Sri Lanka using the variable-resolution Conformal Cubic Atmospheric Model (CCAM) developed at CSIRO, Australia. Bias corrected sea surface temperatures (SSTs) and sea ice ...
Computer Vision Based Object Tracking as a Teaching Aid for High School Physics Experiments

GD Illeperuma; DUJ Sonnadara (IEEE, 2017)

Experiments play a vital role in science education. In high school physics, especially in mechanics, many experiments are conducted where tracking a single or multiple objects are required. In most situations students ...
Time derivative of Electric Field Radiation Generated by Compact Intra Cloud Discharges

R Abeywardhana; M Fernando; U Sonnadara; V Cooray (ICLP, 2016)

Time derivatives of electric field radiation (dE/dt) generated by Narrow Bipolar Pulses (NBP) in two tropical thunderstorms are investigated and two types of pulse characteristic in dE/dt signal were identified. One ...
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 ...
Time - Frequency Analysis of Narrow Bipolar Pulses observed in Sri Lanka

L Gunasekara; A. Vayanganie; S Jayalal; M Fernando; U Sonnadara; V Cooray (ICLP, 2016)

Narrow Bipolar Pulses (NBP) of a single thunderstorm from a coastal location in Sri Lanka were subjected to S-transformation in order to study their timefrequency information. This study is an extension to a similar study ...
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 ...
Regular Pulse Trains in Chaotic pulse Bursts

R Abeywardhana; M Fernando; U Sonnadara; V Cooray (ICLP, 2016)

Electric field pulse bursts generated by lightning flashes are considered as sources of high radio frequencies. In this study, an analysis of pulse bursts in electric field records of 30 negative cloud to ground lightning ...
Collision Detection through Optical Flow

Sandaruwan, S.; Illeperuma, G.; Sonnadara, D.U.J. (IPSL, 2016)

In this paper, an analysis of collision detection via optical flow is presented. The main objective of the work is to detect and initiate a warning signal when there is a non-moving object or a moving object (such as a ...
Spatial and temporal variations of thunderstorm activities over Sri Lanka

Sonnadara, D.U.J. (2016)
Multifractal behavior of wind speed and wind direction

Weerasinghe, R.M.; Pannila, A.S.; Jayananada, M.K.; Sonnadara, D.U.J. (2016)
An assessment of CSIRO Conformal Cubic Atmospheric Model simulations over Sri Lanka

Thevakaran, A.; McGregor, J.L.; Katzfey, J.; Hoffmann, P.; Suppiah, R.; Sonnadara, D.U.J. (2016)

Now showing items 41-60 of 242

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