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Now showing items 1-20 of 35

Linear and non-linear optical properties of OMBD grown PTCDA and Alq3 films

Ajward, A.M. (University of Cincinnati, USA, 2012)

In this thesis, linear and non-linear optical properties of perylene-3,4,9,10 tetracarboxylic-3,4,9,10-dianhydride (PTCDA) and of tris(8-hydroxyquinolinato)aluminum (Alq3) films have been investigated using various ...
Optimized Power Output from Piezoelectric Flexure Element Driven by Low Frequency Vibration

Ganege, H. C.; Gamage, W. G. P. L. M.; Shazla, M. A. F.; Rasul, M. J. M. A. (General Sir John Kotelawala Defence University (KDU), 2015)

Energy harvesting is the process of capturing readily available energy and converting into usable energy. Among the many different types of energy harvesting methods, piezoelectric energy harvesting has become popular as ...
Health Hazards, Risk and Safety Practices in Construction Sites – A Review Study

Vitharana, V.H.P.; Subashi De Silva, G. H. M. J.; De Silva, S. (The Institution of Engineers, Sri Lanka, 2015)

This review attempts to identify the health hazards, risks and causes of poor safety practices in construction sites. In addition, the differences in safety practices in both developed and developing countries and methods ...
Comparing Health Risks among Vehicle Operators in Construction Sites exposed to Whole-Body Vibration Using EU directive 2002/44/EC and ISO 2631-1

Vitharana, V.H.P.; Subashi De Silva, G.H.M.J.; De Silva, S. (Department of Civil and Environmental Engineering, University of Ruhuna, Sri Lanka, ACEPS 2015, 2015)

In Sri Lanka, although workers in construction sites face with several risk factors, they are less aware about risk factors such as exposing Whole-Body Vibration (WBV). Two of main legislations, ISO 2631-1 and EU directive ...
Low-cost impedance spectroscopic system for investigation of solar cell characteristics.

Ajward, A.M.; Gunawardhana, I.D.C.B.K. (Faculty of Science, University of Ruhuna, Sri Lanka., 2017)

A low-cost impedance spectrometer capable of measuring impedance spectra of photovoltaic devices such as solar-cells in the frequency domain has been built. In order to consistently find the impedance of the device by ...
An enhanced amplitude estimation system for sinusoidal signals based on phase sensitive detection

Ajward, A.M. (Faculty of Science, University of Kelaniya, Sri Lanka, 2018)

Highly accurate estimations of the amplitudes of sinusoidal signals that are associated with huge noise levels have many practical applications especially in domains such as research, medicine, and industry. Under considerably ...
Design and Analysis of a Phase Difference Measurement System with Improved Performance.

Ajward, A.M. (Faculty of Science, University of Ruhuna, Sri Lanka., 2018)

The accuracy or error of a phase difference measurement between two different sinusoidal signals is significantly affected by the noise in them. Quadrature Demodulation (QD) is one of the methods used for calculating the ...
Development of lower back pain prevention index due to whole body vibration: system dynamics

Vitharana, V.H.P.; Chinda, T.; Ammarapala, V. (Thammasat University, 2018)

Prolonged exposure to whole body vibration (WBV) is a major health hazard for construction workers, leading to various chronic health problems. Heavy equipment operators (HEOs) are exposed to WBV most of the time. This ...
Policy analysis of the budget used in training program for reducing lower back pain among heavy equipment operators in the construction industry: System dynamics approach

Vitharana, V.H.P.; Chinda, T. (IOP Conference Series: Earth and Environmental Science, IOP Publishing, 2018)

Lower back pain (LBP), prevalence is high among the heavy equipment operators leading to high compensation cost in the construction industry. It is found that proper training program assists in reducing chances of having ...
A computationally efficient electrocardiogram analysis system.

Ajward, A.M. (Faculty of Science, University of Ruhuna, Sri Lanka., 2019)

Fast, portable and accurate electrocardiogram (ECG) analysis systems play a major role in the diagnosis of the cardiovascular diseases that causes a vast number of deaths each year. Even though the application of the wavelet ...
Extraction and characterization of bio-based polymeric materials from traditional rice varieties in Sri Lanka

Pabasara, W.G.A.; Nanayakkara, M.P.A.; Samarasekara, A.M.P.B.; Amarasinghe, D.A.S.; Karunanayake, L. (Faculty of Agriculture, University of Peradeniya, 2019)

Introduction of sustainable and environmentally friendly alternatives for petroleum chemical-based polymers have become one of the most challenging areas of research. Hence, this study addresses the issue by suggesting a ...
Structural equation modelling of lower back pain due to whole-body vibration exposure in the construction industry

Vitharana, V.H.P.; Chinda, T. (International Journal of Occupational Safety and Ergonomics, Taylor & Francis, 2019)

Whole-body vibration (WBV) exposure is a health hazard among workers, causing lower back pain (LBP) in the construc tion industry. This study examines key factors affecting LBP due to WBV exposure using exploratory factor ...
A fast and efficient random flicker detection system based on a novel low-pass quadrature filter

Ajward, A.M. (Faculty of Science, University of Ruhuna, Sri Lanka., 2020)

Many known literature techniques are available to detect flicker in electric power systems and to mitigate them. However, they are not suitable to detect random flicker in the presence of the higher-order harmonics. This ...
Study of the Use of Natural Pigments Extracted from Nephelium lappaceum (Rambutan) Peel and Melastoma malabathricum (Maha Bovitiya) Seeds as an Alternative to Synthetic Acid-Base Indicators

Weerarathne, K.K.D.C.S.; Samaraweera, R.L. (Uva Wellassa University Badulla, 90000 Sri Lanka, 2020)

Acid-base indicators are widely used for visual detection of the endpoint of an acid-base titration. Most of these indicators are organic dyes of synthetic origin. These are hazardous, expensive, and harmful to the ...
Design of a Barge for Small Scale Excavator in Narrow Canal

Manoj Kumara, J.L.R.; Lakmal Perera, H.S. (Associated Asia Research Foundation (AARF), 2020)

The Sri Lanka Land Reclamation and Development Corporation (SLLRDC) is a Government Corporation operating under the Ministry of Megapolis and Western Development, mainly involved in dredging of canals, canal maintenance, ...
Prosthetic Heart Valves – "The Beat Goes On"

Weerarathne, K.K.D.C.S. (Department of Science and Technology, Faculty of Applied Sciences, Uva Wellassa University of Sri Lanka, 2020)
Identify the Supra Harmonics in Low Voltage Distribution System Due to Photovoltaic Inverters

Ganege, H.C. (University of Ruhuna, Matara, Sri Lanka, 2021)

A significant amount of voltage and current distortion were detected in the power distribution system due to the problem of power system harmonics; it is the impact of the poor power quality. Over the past few decades, ...
An Efficient Power-Line Interference Removal System for Electrocardiograms

Ajward, A.M. (Faculty of Science, University of Ruhuna, Sri Lanka., 2021)

Even though many adaptive notch filter based literature techniques for removing Power-Line Interference (PLI) noise with harmonics are available, these known techniques are often inefficient for Electrocardiogram (ECG) ...
Mathematical Modeling and Simulation of Acoustic Properties of Knitted Fabrics Backed by an Air Cavity

Madushika, J.W.A.; Wijerathne, J.K.; Lanarolle, W.D.G. (Postgraduate Institute of Science (PGIS), University of Peradeniya, Sri Lanka, 2021)

Noise pollution has become a critical issue in the modern world of ever-increasing industries and machinery. Noise should be controlled due to the physical and psychological health effects associated with noise. Textiles ...
Development of a lower back pain prevention index for heavy equipment operators in the construction industry: system dynamics modelling

Vitharana, V.H.P.; Chinda, T. (International Journal of Construction Management, Taylor & Francis, 2021)

Lower back pain (LBP) due to the whole-body vibration exposure is a common health problem among heavy equipment operators in the construction industry. This study utilizes a system dynamics modelling approach to develop a ...

Now showing items 1-20 of 35

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