Department of Physics: Recent submissions

Now showing items 201-220 of 242

Performance of parallel port based remote data acquisition systems in real-time data processing

Sonnadara, D.U.J.; Goonetilleke, P.C.C.P.W. (2002)

A parallel port based remote data acquisition and process control system was built without on board RAM and programmable timer to test the effect on the performance when processing real-time data on a network environment. ...
Construction of a High Speed Buffer Amplifier to Measure Lightning Generated Vertical Electric Fields

Sonnadara, D.U.J.; Edirisinghe, C.M.; Fernando, I.M.K. (2001)

A high-speed Buffer Amplifier circuit was constructed with a buffer Amplifier IC OPA633 that can be coupled to a parallel plate antenna via 60cm coaxial cable to measure the lightning generated vertical electric fields. ...
Performance Comparison between the Magnetic Direction Finding Technique and the Time of Arrival Technique

Sonnadara, D.U.J.; Edirisinghe, C.M.; Fernando, I.M.K. (2001)

A study was carried out in order to understand the strengths and weaknesses of two popular lightning locating systems namely, the wide band magnetic direction finding category (sometimes referred to as IMPACT sensors) ...
Preliminary Results of Long-Term and Short-Term Rainfall Forecasting

Sonnadara, D.U.J.; Perera, H.K.W.I. (2000)

Possibility of using statistical methods for long-term and short-term rainfall forecasting was investigated. Daily rainfall data from 8 meteorology stations namely, Colombo, Ratnapura, Kandy, Galle, Hambanthota, Batticoloa, ...
A Study of LLP Systems and their Performance in Locating Lightning Ground Flashes in Sri Lanka (1998 − 1999)

Sonnadara, D.U.J. (2000)

A study of the performance of wideband magnetic direction finding systems used in locating lightning ground flashes in Sri Lanka is presented. The studies carried out with these systems show that they are highly sensitive ...
Locating cloud-to-ground lightning flashes with simultaneous two-station measurements

Sonnadara, D.U.J.; Weerasekera, A.B; Fernando, I.M.K; Lelwala, R; Jayaratne, K.P.S.C; Ariyaratne, T.R; Namasivayam, S; Bandara, K.R.A (2000)

The position reconstruction of the point of strike of cloud-to-ground lightning flashes in several thunderstorms recorded by two-wideband magnetic direction finding stations is presented. Lightning activity data show a ...
Online Trigger System to select particle Generated in High Multiplicity Environments

Sonnadara, D.U.J.; Cleland, W.E; Voloshin, S.A (2000)

An online hardware/software trigger system was built and implemented, which is capable of tracking and identifying particles generated in high multiplicity environments. The hardware portion of the trigger generates the ...
Development of Client-Server based Network Centric Remote Data Acquisition Systems

Sonnadara, D.U.J.; Jayananda, M.K; Ranasinghe, D.N; Obadage, C.T (1999)

A network centric remote data acquisition system was developed by utilizing the available network resources and technologies such as Java applets / applications and sockets. The digitizing hardware was based on an AD7569 ...
Study of the performance of direction finding stations prior to the implementation of a lightning locating system in Sri Lanka

Sonnadara, D.U.J.; Fernando, I.M.K.; Jayarathne, K.P.S.C.; Ariyarathne, T.R.; Namasivayam, S.; Bandara, K.R.A. (1998)

Two direction finding stations placed in close proximity are used to monitor lightning ground flashes occurred in several thunderstorms during the monsoon season (April to July 1998). From the data collected by both ...
Deuterium-induced volume expansion in Fe0.5V0.5 /V superlattices

Palsson, Gunnar K.; Kapaklis, V.; Dura, Joseph A.; Jacob, Julie; Jayanetti, J. K. D. S. (2010)

Neutron reflectometry was used to investigate the deuterium uptake in a thin metal superlattice that displays an anisotropic elastic response Fe0.5V0.5 /V 6/21 monolayers . We see evidence of the presence of a ...
Performance of Neural Networks in Forecasting Short Range Occurrence of Rainfall

Rathnayake, V.S.; Premaratne, H.L.; Sonnadara, D.U.J. (2011)

The performance of Artificial Neural Networks in forecasting the short range (3-6 hourly) occurrence of rainfall is presented. Feature sets extracted from both surface level weather parameters and satellite images were ...
Electrodeposition and characterisation of CuInSe2 for applications in thin film solar cells

De Silva, K.T.L.; Jayanetti, J. K. D. S.; Chithrani, B.D.; Priyantha, W.A.A.; Siripala, W. (2001)

Copper indium diselenide ŽCuInSe2. layers have been grown at room temperature by electrochemical deposition technique in an aqueous medium. Resulting thin films have been characterised using XRD, XRF, XPS, GDOES and SEM ...
The Structure of Yb3+ Aquo Ion and Chloro Complexes in Aqueous Solutions at Up to 500 C and 270 MPa

Mayanovic, Robert A.; Jayanetti, J. K. D. S. (2002)

We report here on X-ray absorption fine structure (XAFS) measurements used to determine the structure of the Yb3+ ion in aqueous solutions over a range of temperatures from 25 to 500 °C and pressures up to 270 MPa. ...
A simple reconfigurable microprocessor in a 36 macrocell CPLD

Wijesinghe, W.A.S.; Jayananda, M.K.; Sonnadara, D.U.J. (2011)

This paper describes a simple microprocessor developed using a complex programmable logic device (CPLD), with an instruction set optimized for data acquisition applications. The processor encompasses a tiny instruction set ...
Electrodeposition of p-type, n-type and p-n Homojunction Cuprous Oxide Thin films

Jayathilaka, K.M.D.C.; Siripala, W.; Jayanetti, J. K. D. S. (2008)

Potentiostatic electrodeposition of cuprous oxide (Cu2O) thin films in aqueous acetate baths was investigated to study the conduction type, n-type or p-type, and the p-n homojunction formation of the films, using ...
Simulation of Diffusion Limited Aggregation in Field Programmable Gate Arrays

Wijesinghe, W.A.S.; Jayananda, M.K.; Sonnadara, D.U.J. (2010)

This paper presents design considerations and performance in implementation of Diffusion-limited aggregation (DLA) process on a Xilinx Spartan 3 Field Programmable Gate Array (FPGA). The DLA cluster algorithm was implemented ...
Effectiveness of Neural Networks in Forecasting Daily Precipitation using Multiple Sources

Weerasinghe, H.D.P; Premaratne, H.L.; Sonnadara, D.U.J. (2010)

The effectiveness of neural network based models in forecasting daily precipitation based on ground level measurements, obtained from a cluster of weather stations in the dry zone of Sri Lanka is presented. The implemented ...
Adaptive neuro-fuzzy traffic signal control for multiple junctions

Wannige, C.T.; Sonnadara, D.U.J. (2009)

The performance of neuro-fuzzy traffic signal control at two independent traffic junctions is discussed. In this work, traffic conditions at two 4-way traffic junctions were simulated and flow of traffic on the road ...
Measurement of Noise within Passenger Trains on a Costal Railway Line

Pahalavithana, N.S.; Sonnadara, D.U.J. (2009)

The noise levels within passenger trains operating on a coastal railway line is presented. It was found that the engine noise is the main source of traction noise. Its contribution to the overall noise level within the ...
Predicting Three-dimensional Fractal Dimensions of Electrical Discharges using Two-dimensional Projections

Amarasinghe, D.; Sonnadara, D.U.J. (2009)

Three dimensional electrical discharge patterns are simulated to compare the three-dimensional structure with the two-dimensional projections of the same. The discharge patterns are simulated using a stochastic dielectric ...

Now showing items 201-220 of 242

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