Nandana Wasantha Kumara Jayatissa

• B.Sc (Kelaniya), M.Sc (Otago), M.E (Canterbury)
• Senior Lecturer at University of Kelaniya

In this empirical study, socioeconomic factors that can easily be extracted from families have been used to build a "home electricity usage prediction" model based on two variables, family monthly income and family size. Each of these factors was evaluated individually. Two machine learning models were built using those factors as features. Two new...

Home micro-grid concepts have gained interest in the modern world due to the increased distributed generations with renewable energy sources. The present "DC-AC-DC" route from distributed generations to DC loads via inverters may not be rational from the viewpoint of system simplicity and energy efficiency. Considering the increasing prevalence of...

Electroencephalography (EEG) is the process of observing the electrical activity of the brain. In recent years there has been an increase in the availability of low-cost EEG headsets in the consumer market. This study was conducted using such a device, the Emotiv Insight 5-channel EEG headset. The objective of this study is to visually stimulate th...

Natural wind in the open air is a three-dimensional vector but vertical component of the wind is ignored in the most meteorological operations. Therefore, the surface wind is considered as a two-dimensional vector in this study. Wind speed changes rapidly. So, the anemometers must have better response. Ultrasonic waves with frequency more than 20 k...

A "Switched Mode Power Supply (SMPS)" is an electronic device that involves switching regulation for efficient power conversion. They take power from an AC or a DC input, and produce a processed current/voltage output of DC power. The major advantage of a SMPS over linear supplies is the higher efficiency. Since the control elements of them are con...

Urban areas, although better served than rural areas, are struggling to keep up with the population growth. Population increase of the Earth is directly related to the global food and energy demand. Expansion of the agricultural sector and the energy sector considerably increase the competition for water. Population growth is directly proportional...

During the 21st century the global surface temperature has increased dramatically as a result of that, Air conditioners are often used to improve thermal comfort and indoor air quality. In both developed and developing countries, air conditioners increase the occupancy ratio of building areas. But air conditioners are expensive option for this issu...

As the world’s energy resources are diminishing, we need to find greener solutions through renewable energy sources that can generate electricity for heating, lighting homes and for a variety of commercial and industrial uses. Among many types of renewable energy resources, such as wind and solar energy, are constantly replenished and will never ru...

Abstract􀂲􀀳􀁈􀁕􀀃 􀁆􀁄􀁓􀁌􀁗􀁄􀀃 􀁈􀁑􀁈􀁕􀁊􀁜􀀃 􀁘􀁖􀁄􀁊􀁈􀀃 􀁌􀁑􀀃 􀁄􀁑􀁜􀀃 􀁆􀁒􀁘􀁑􀁗􀁕􀁜􀀃 􀁌􀁖􀀃 􀁈􀁛􀁓􀁒􀁑􀁈􀁑􀁗􀁌􀁄􀁏􀁏􀁜􀀃 􀁌􀁑􀁆􀁕􀁈􀁄􀁖􀁌􀁑􀁊􀀃 􀁚􀁌􀁗􀁋􀀃 􀁗􀁋􀁈􀁌􀁕􀀃 􀁇􀁈􀁙􀁈􀁏􀁒􀁓􀁐􀁈􀁑􀁗􀀑􀀃 􀀤􀁖􀀃 􀁄􀀃 􀁕􀁈􀁖􀁘􀁏􀁗􀀏􀀃 􀁗􀁋􀁈􀀃 􀁆􀁒􀁘􀁑􀁗􀁕􀁜􀂶􀁖􀀃􀁇􀁈􀁓􀁈􀁑􀁇􀁈􀁑􀁆􀁈􀀃􀁒􀁑􀀃􀁗􀁋􀁈􀀃􀁉􀁒􀁖􀁖􀁌􀁏􀀃􀁉􀁘􀁈􀁏􀁖􀀃􀁉􀁒􀁕􀀃􀁈􀁑􀁈􀁕􀁊􀁜􀀃􀁊􀁈􀁑􀁈􀁕􀁄􀁗􀁌􀁒􀁑􀀃􀁌􀁖􀀃􀁄􀁏􀁖􀁒􀀃 􀁌􀁑􀁆􀁕􀁈􀁄􀁖􀁌􀁑􀁊􀀃 􀁗􀁕􀁈􀁐􀁈􀁑􀁇􀁒􀁘􀁖􀁏􀁜􀀃 􀁆􀁕􀁈􀁄􀁗􀁌􀁑􀁊􀀃 􀁈􀁆􀁒􀁑􀁒􀁐􀁌􀁆􀀃 􀁄􀁑􀁇􀀃 􀁈􀁑􀁙􀁌􀁕􀁒􀁑􀁐􀁈􀁑􀁗􀁄􀁏􀀃 􀁆􀁒􀁑􀁆􀁈􀁕􀁑􀁖􀀑􀀃 􀀷􀁕􀁒􀁓􀁌􀁆􀁄􀁏􀀃 􀁆􀁒􀁘􀁑􀁗􀁕􀁌􀁈􀁖􀀃 􀁕􀁈􀁆􀁈􀁌􀁙􀁈􀀃 􀁆􀁒􀁑􀁖􀁌􀁇􀁈􀁕􀁄􀁅􀁏􀁈􀀃 􀁄􀁐􀁒􀁘􀁑􀁗􀀃 􀁒􀁉􀀃 􀁖􀁒􀁏􀁄􀁕􀀃 􀁕􀁄􀁇􀁌...

As the world's energy resources are diminishing, we need to find greener solutions through renewable energy sources that can generate electricity for heating, lighting homes and for a variety of commercial and industrial uses. Among many types of renewable energy resources, such as wind and solar energy, are constantly replenished and will never ru...

A device was designed to obtain a dual axis rotation of a plate which can be used for various applications like Solar Tracking devices, celestial observatoryetc. The major problem associated with solar trackers, is the consumed power by the tracker. Moreover, obtaining continuous tracking is very difficult with electrical systems which require much...

The measurement of wind speed and direction are the most important factors in weather prediction. They can be measured by a variety of tools. The most common, complete portable system is the anemometer, which typically consists of a rotating vane to measure the direction and a shaft with cups that rotate with the wind to measure its speed. There ar...

A small-scale experimental salinity-gradient solar pond, which will be utilized for the research and development in harnessing solar energy for desalination of seawater and generation of electricity, has been constructed. The pond has effective length, width and depth of 3.0 m, 2.0 m and 2.0 m, respectively, covering a volume capacity of 12.0 m 3....

The thermo-foil is an insulation material which can be used to insulate roofs of residential buildings which causes less energy to accomplish a comfortable temperature inside the building. It's becoming popular in Sri Lankan building construction sector. In this research, an investigation of the efficiency of the thermo-foils is done for commonly u...

There were many standards of communication between host computers and peripherals, but the goal was to create a technology that combines low and high speed bus activity. Today USB has become a very popular expansion to the PC. An inexpensive USB interfaced home automation system is designed as an alternate for available expensive similar systems. T...

The thermo-foil is an insulation material which can be used to insulate roofs of residential buildings which causes less energy to accomplish a comfortable temperature inside the building. It’s becoming popular in Sri Lankan building construction sector. In this research, an investigation of the efficiency of the thermo-foils is done for commonly u...

The thermo-foil is an insulation material which can be used to insulate roofs of residential buildings which causes less energy to accomplish a comfortable temperature inside the building. In this study, an investigation of the efficiency of the thermo-foils in building insulation is performed. The thermal insulation properties and structure of the...

Electromagnetic radiation is classified into types according to the frequency of the waves such as radio waves, microwaves, terahertz radiation, infrared radiation, visible light, ultraviolet radiation, X-rays and gamma rays. UV radiation is a part of the electromagnetic spectrum emitted by the sun, and is divided according to wavelength into three...

Multilevel and three-dimensional (3D) patterning eliminates more complicated steps in the fabrication processes of micro and nanoscale structures. Multiple lithography processes with inter-level alignment or single lithography with multi layer resist is essential for three-dimensional patterning. Nanoimprint lithography has demonstrated the potenti...

Three-dimensional patterning reduces more complicated alignment steps in the fabrication of micro and nano-scale structures. Multiple lithography processes with interlevel alignment or single lithography with multi layer resist is essential for three dimensional patterning. A number of 3D structures have found immediate applications in a range of m...

Temperature control offers benefits in land-based marine aquaculture: stock growth rates may be enhanced by heating in winter; mortality rates in summer may be reduced by cooling. However, if the plant is not well designed, temperature control may create very large energy demands. This paper describes the application of temperature control in abalo...

Three-dimensional patterning reduces more complicated alignment steps in the fabrication of micro and nano-scale structures. Multiple lithography processes with interlevel alignment or single lithography with multi layer resist is essential for three dimensional patterning. A number of 3D structures have found immediate applications in a range of m...

The thermo-foil is an insulation material which can be used to insulate roofs of residential buildings which causes less energy to accomplish a comfortable temperature inside the building. In this study, an investigation of the efficiency of the thermo-foils in building insulation is performed. The thermal insulation properties and structure of the...