Science: Recent submissions

Now showing items 461-480 of 846

Incorporation of crop phenology in Simple Biosphere Model (SiBcrop) to improve land-atmosphere carbon exchanges from croplands

Lokupitiya, E.Y.K.; Denning, S.; Paustian, K.; Baker, I.; Schaefer, K.; Verma, S.; Meyers, T.; Bernacchi, C. J.; Suyker, A.; Fischer, M. (Copernicus Publications on behalf of the European Geosciences Union, 2009)

Croplands are man-made ecosystems that have high net primary productivity during the growing season of crops, thus impacting carbon and other exchanges with the atmosphere. These exchanges play a major role in ...
A Markov chain probability model to describe wet and dry patterns of weather at Colombo

Sonnadara, D.U.J.; Jayewardene, D.R. (Springer, 2015)
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 ...
Electric field signatures of narrow negative bipolar pulse activities from lightning observed in Sri Lanka

Gunasekara, T.A.L.N.; Mendis, U.; Fernando, M.; Sonnadara, D.U.J.; Cooray, V. (2014)

- Isolated Narrow Bipolar Pulses (NBP) have been observed in the past in sub tropical and tropical regions. This study presents detail electric field characteristics of NBP pulses observed in Sri Lanka in the tropic. ...
A Markov chain probability model to describe wet and dry patterns of weather at Colombo

Sonnadara, D.U.J.; Jayewardene, D.R. (Springer Vienna, 2015)

The hypothesis that the wet and dry patterns of daily precipitation observed in Colombo can be modeled by a first order Markov chain model was tested using daily rainfall data for a 60-year period (1941–2000). The probability ...
SuSi : A Monte Carlo model of a novel proton CT Scanner using Geant4

Price, Tony; Taylor, Jon; Esposito, Michela; Poludniowski, Gavin; Jeyasingam, Jeyasugiththan (University of Birmingham, UK, 2014)

Proton radiotherapy uses beams of high energy protons to treat cancer. It is specifically used for cancers in children and near delicate structures due to the ability of delivering a highly focused dose to the cancer volume. ...
Heavy metal accumulation in two synanthropic avian species in Sri Lanka

Fernando, W. B. P. S.; Perera, S. P. P. M.; Vithanarachchi, R. M.; Wijesekera, R. D; Wijesinghe, M.R. (2020)

We assessed the levels of Pb, Cd, and Mn in contour feathers of the feral pigeon (Columba livia) and house crow (Corvus splendens) obtained from five urban/suburban locations across Sri Lanka, using the AAS following ...
Conserving Biodiversity in Agricultural Landscapes: A perspective on Sri Lanka

Wijesinghe, M.R. (The Institute of Biology, Sri Lanka, 2019)

Agricultural development, worldwide, is a major cause for the loss of natural forest and, consequently, of the planet’s biodiversity. In Sri Lanka, a globally recognized biodiversity hotspot, what amounts to over half ...
THE POPHAM ARBORETUM: A REFUGE FOR GREY SLENDER LORIS (Loris lydekkerianus) IN AN URBANIZED LANDSCAPE IN SRI LANKA

WEERARATHNE, W. A. P. P.D.; Wijesinghe, M.R. (2019)

The aim of the present study was to document the population size, distribution and habitat preferences of the Grey Slender Loris (Loris lydekkerianus) in the Popham Arboretum in Dambulla, Sri Lanka. The Popham Arboretum ...
Inter-population variation in thermal sensitivity of the tropical toad Duttaphrynus melanostictus, across a small spatial scale in Sri Lanka

Algiriyage, D.P.H.; Jayaweera, H.; Wijesinghe, M.R. (Elsevier Ltd., 2020)

Inter-population disparities in a species have been shown to occur as an adaptation to different thermal regimes in the environment. We investigated the thermal sensitivities of the tropical toad Duttaphrynus melanostictus ...
Impacts of Climate Change on Biological Diversity: A Sri Lankan Perspective on Vulnerability and Resilience

Wijesinghe, M.R. (The Institute of Biology, Sri Lanka, 2020)

There is now a growing body of evidence that climate change is likely to cause adverse impacts on biodiversity worldwide. Sri Lanka, a tropical island supporting exceptionally high levels of biodiversity and endemism, ...
Screening of Selected Rice Varieties and Advanced Breeding Lines against Iron Toxicity under Field Conditions in the Low Country Wet Zone of Sri Lanka

Siriwardana, K.G.D.I.; Weerasinghe, W.D.P.; Priyantha, G.D.A.; Chandrasekara, K.K.D.; Rupasinghe, M.D.N.; Wickramasinghe, W.R.K.D.W.K.V.; Dissanayake, I; Wijesinghe, M.R. (2018)

Iron toxicity is one of the most commonly observed soil nutritional disorders, which causes lowering of rice yields, especially in the low country wet zone (LCWZ), Sri Lanka. A field screening experiment was conducted ...
Combating Extreme tropical Seasonality: Use of rock Crevices by the Critically Endangered frog Nannophrys marmorata in Sri lanka

Senanayake, Uvini I.; Siriwardana, Sahan; Weerakoon, Devaka K.; Wijesinghe, M.R. (2019)

Kirtisinghe’s Rock Frog (Nannophrys marmorata) is endemic to Sri Lanka and is found only on the northeastern slopes of the Knuckles Mountain Range, where a short wet season is followed by a prolonged dry season. The dry ...
Effects of Habitat Change on the Web Characteristics and Fitness of the Giant Wood Spider (Nephila pilipes) in Sri Lanka

Wijerathna, Tharaka; Tharanga, Dilini; Perera, Inoka C.; Wijesinghe, M.R. (2019)

Loss and fragmentation of rainforests have led to serious implications on the survival of many species, ofen leading to population decline, or sometimes local extinction. Spiders are key inhabitants of rainforest ...
PROTECTED AREA OFFENCES IN SRI LANKA: A CASE STUDY OF THE KUMANA NATIONAL PARK AND PANAMA-KUDUMBIGALA SANCTUARY

KRISHAN, K.T.; GULEGODA, C.R.; RANASINGHE, R.P.T.I.; Wijesinghe, M.R. (2020)

The effective management of the protected areas will play a pivotal role in conserving Sri Lanka’s biological diversity. Although the country’s protected area network is extensive and governed by a stringent set of laws ...
Assessing yield losses due to iron toxicity in lowland rice under the field conditions

Siriwardana, K.G.D.I; Weerasinghe, W.D.P.; Chandrasekara, K.K.D.; Priyantha, G.D.A.; Rupasinghe, M.G.N.; Wijesinghe, M.R. (2018)

In Sri Lanka, iron toxicity is recognized as one of the most widespread soil constraints for rice production, particularly in the low country wet zone. This paper investigates plant growth and yield production resulting ...
Estimating separability of magnetisation signals by fast implementation of Bloch equation simulations across multiple tissues and distance correlation function

Iddagoda, M; Jayaweera, H H E; Wansapura, J (Faculty of Science, University of Kelaniya, Sri Lanka, 2020)

Magnetic Resonance Fingerprinting (MRF) is an emerging field in Magnetic Resonance Imaging (MRI) where tissues to be identified are subjected to a series of magnetic pulses. The resulting magnetisation signal is governed ...
Calibration of the rolling angle of a Quadrant Photo Detector mounted in the image plane of a dark-field passive LIDAR system

Abeywickrama, S S; Perera, H E; Jayaweera, H H E (Faculty of Science, University of Kelaniya, Sri Lanka, 2020)

Passive Light Detection and Ranging (LIDAR) has successfully been used for observing insects and their activities. It was reported that such techniques are more efficient compared to traditional approaches. Quadrant Photo ...
Implementation of a wireless distributed node-based system for monitoring, controlling and data logging of a Parabolic Trough Concentrator

Viraj, M P S; Perera, H E; Kumara, P D C; Jayaweera, H H E (Faculty of Science, University of Kelaniya, Sri Lanka, 2020)

Solar thermal energy harnessing through a Parabolic Trough Concentrator (PTC) type plant is the most efficient and cheapest technique in the field of renewable energy harnessing. Near real time performance monitoring and ...
Use of Google Earth Engine to monitor surface water: A case study in water tanks located in the dry zone of Sri Lanka

Perera, H. E; Jayaweera, H H E (Faculty of Science, University of Kelaniya, Sri Lanka, 2020)

Water is a valuable and limited resource that needs to be managed properly. The amount of surface water changes over time due to a variety of reasons including rainfall, temperature, wind patterns and agricultural usage. ...

Now showing items 461-480 of 846

Search DSpace

Advanced Search

Browse

All of DSpace
This Community
- By Issue Date
- Authors
- Titles
- Subjects

Recently added

Science: Recent submissions

Search DSpace

Browse

All of DSpace

This Community

My Account