Browsing ERU - 1999 by Title

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  • Earthquake resistance of loadbearing brickwork structures 
    Wijeratne, MD; Jayasinghe, MTR [Conference-Full-text]
    Unreinforced loadbearing brickwork is a cost effective alternative to reinforced concrete frame structures in low rise residential building such as two to three storey houses, hostel buildings and hotels. For its widespread ...
  • An electronic ampere-hour meter 
    Ranaweera, A; De Silva, WNH; Eranjeewa, AAT; Epa, DJ; Kandeepan, K [Conference-Full-text]
    The electronic ampere-hour meter does not require any voltage supply and its operation is based on the magnetic coupling to electrical conductors feeding consumer's load. A capacitor inside the meter is charged at a rate ...
  • Energy dissipation characteristics of rock armoured rubble mound breakwaters 
    Hettiarachchi, SSL; Mirihagalla, PD [Conference-Full-text]
    The paper presents the results of large scale physical model investigations on the hydraulic performance of rock armoured rubble mound breakwaters. The energy dissipation characteristics of conventional trapezoidal layered ...
  • Energy efficiency in office buildings: lighting sector 
    Fernando, WJLS; Wijayatunga, PDC; Ranasinghe, S [Conference-Full-text]
    Efficient utilisation of energy is considered to be one of the main tools of controlling the ever increasing demand for energy, especially in developing countries where there is a large potential for improvement. In recent ...
  • Estimation of annual collectible energy by flat plate solar thermal collectors: case study of Colombo 
    Hewawasam, GDK; Attalage, RA [Conference-Full-text]
    The Utilizability concept has been adopted as a design method for flat plate solar thermal collector sizing. Hourly & Daily utilizability curves on a monthly time scale have been generated for the city of Colombo using ...
  • Feasibility of vapour absorption based air- conditioning in industries: a case study 
    Wijayatunga, PDC; Attalage, RA; Sugathapala, AGT [Conference-Full-text]
    This paper presents the results of financial and technical feasibility of vapour absorption based air- conditioning systems (VAAC) in an industrial environment in comparison to vapour compression based systems (VCAC). The ...
  • A generic approach for developing dedicated database systems for professional applications 
    Nanayakkara, LDJF; Ganesapiragas, S [Conference-Full-text]
    There are many benefits to be reaped by organizations of small and medium size by encouraging and exploiting the motivations non-IT engineering professionals possess for programming applications for day- to-day use. Potential ...
  • Lamp driver & failure detector for incandescent lamps in traffic signal systems 
    Jayasinghe, JAKS; Ranaweera, RAKP [Conference-Full-text]
    The design and implementation of a low cost solid-state lamp driver and failure detector (LD/FD) for incandescent lamps is described. The design is directly targeted for the signal lamp heads in highway traffic signal ...
  • Multiprocessor architecture for adaptive control of traffic light systems 
    Jayasinghe, JAKS [Conference-Full-text]
    Construction of new highways or expansion of existing highways to meet the ever- increasing highway traffic is a very expensive and time-consuming task. Management of existing highways effectively is considered as a high ...
  • Online automatic charger for maintenance free sealed battery supplies 
    Jayasinghe, JAKS; Ranaweera, RAKP [Conference-Full-text]
    The design and implementation of a high performance, automatic battery charger is described. The main target application of the design is for on-line battery backup systems requiring high reliability such as highway traffic ...
  • Optical character recognition for sinhala text using feature analysis 
    Watugala, GK; Kumara, WMP [Conference-Full-text]
    Optical Character Recognition (OCR) is now a reality for documents printed in English. In the present study, the groundwork for the recognition of Sinhala characters is done. Matrix Matching and Feature Analysis are the ...
  • Performance of an electronic energy meter 
    Ranaweera, A; Wickramaratne, LS [Conference-Full-text]
    In this paper the principle of operation, implementation and performance of an integrated circuit based electronic energy meter are described. Comparison is made of the performance of the electronic energy meter with that ...
  • Prediction settlements of foundations on soft soils - a case study 
    Thilakasiri, HS; Peiris, TA; Tennakoon, BL [Conference-Full-text]
    Excessive settlement of engineering structures and subsequent correction procedure have become a major concern for both the public and the engineering community. The severity of the above problem has increased due to the ...
  • Proceedings of the Annual Symposium 1999 (Pre Text) 
    Hettiarachchi, P [Conference-Full-text]
  • Radio telemetry receiver 
    Branavan, SRK; Gunasekera, HMG; Nandasiri., NHANL [Conference-Full-text]
    A narrow band tunable radio telemetry receiver capable of operating over the license free bands of 26.9 - 27.3 MHz and 46 - 50 MHz was designed. The receiver is tuneable within the specified frequency bands, and supports ...
  • Refrigeration system for Sri Lankan fishing boats 
    Wimalsiri, WK; Weerakoon, DAW; Weerasinghe, NMC; Fernando, MJP [Conference-Full-text]
    The fisheries sector in Sri Lanka has been expanding during past decade with growing local demand and export of fish. In order to cope with the demand, the size of fishing boat used for multi-day, deep-sea fishing has now ...
  • Retrofitting of a r-12 based domestic refrigerator to run on r-134a 
    Attalage, RA; Sugathapala, AGT; Perera, KKCK [Conference-Full-text]
    The possibility of operating a domestic vapour compression refrigerator system by replacing its existing Chloro-Fluro-Carbon (CFC, or R-12, or Freon-12) refrigerant with the Ozone friendly new refrigerant R- 134a has been ...
  • Silicone-wax filler to give stain resistance to cement, tile, terrazzo, terra cotta, marble, granite and timber surfaces 
    Perera, SAS [Conference-Abstract]
    The Silicone-Wax Filler discussed in this paper was developed for a reputed porcelain tile manufacturing company for use as a surface filler/sealer to a grade of floor tile called the polished tile, to make the tile stain ...
  • Simple monte carlo simulation using matlab 
    Indralingam, M [Conference-Full-text]
    Many computer programming languages are currently available for various computing needs. MATLAB is one language which is most suitable for all scientific programming. Many engineers and scientists have not understood or ...
  • Smart cache for central offline download system 
    Bandara, S; Dias, G [Conference-Full-text]
    In Sri Lanka the communication links to the Internet are heavily congested during the peak hours. But they are not fully utilized during the off-peak hours such as in the night. Downloading a large file is an impossible ...