Browsing UoM Conferences by Year "2000"

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  • An analysis of pelton turbines as related to mini-micro hydro applications 
    Fernando, MARV [Conference-Full-text]
    Large Pelton turbines used in major hydro applications are of high efficiency, in the range of 92% or more. However, Peltons used in mini-hydro applications in Sri Lanka were often found to be of lower efficiency, and of ...
  • Application of mebrane separation processes to the Sri Lankan industry 
    Amarasinghe, BMWPK; De Silva, IMBM [Conference-Full-text]
    Membranes and membrane based separation techniques have developed rapidly over the last two decades with a considerable technical and commercial impact. The technology is now widely used for a range of applications including ...
  • Cashew nut shell liquid based polymer resin for making air- drying varnishes 
    Subramaniam, K; Fernando, S [Conference-Full-text]
    As cashew nut shell liquid (CNSL) is a natural source of phenols, attempts are made in this work to prepare a synthetic polymer resin from the liquid, by treating it with formaldehyde. The polymer resin thus prepared is ...
  • Chemical treatment of timber, a novel method 
    Fernando, MARV [Conference-Full-text]
    Dwindling resources of quality timber made manufacturers to look for alternatives. Species such as Rubber -"Hevea brasiliensis" were found to be good alternatives once treated against "Borer" attack. While expensive ...
  • Design & construction of an energy-efficient furnace for melting non-ferrous alloys in the local foundry industry 
    Tittagala, SR; Navarathna, NPNM [Conference-Full-text]
    A study has been carried out on the types of construction and factors affecting efficiency of metal melting furnaces currently used in the non-ferrous foundry sector with the objective of developing an oil-fired furnace ...
  • Design of continuous prismatic prestressed concrete spine beams with variable prestressing forces 
    Ranasinghe, WMDN; Jayasinghe, MTR [Conference-Full-text]
    Design of continuous prismatic prestressed concrete continuous spine beams is a complex task, primarily due to the secondary moments that occur as a result of the prestressing effects. In prestressed concrete members, it ...
  • Design of yagi array receiving antennas using genetic optimization 
    Jayasinghe, JAKS [Conference-Full-text]
    YAGI array is a very popular antenna for VHF/UHF applications due to its simple construction. It is extensively used in television and FM radio reception. However, design of YAGI arrays to meet a given set of specifications ...
  • Designing fuzzy logic damping controllers for large practical power systems 
    Peiris, HJC [Conference-Full-text]
    A methodology for designing fuzzy logic damping controllers for large practical power systems is presented in this paper. The proposed approach uses (i) the Prony Signal & Transfer Function Identification Technique to ...
  • Development and evaluation of the aesthetics of structural form 
    Kulasuriya, C; Dias, WPS; Hettiarachchi, MTP [Conference-Full-text]
    This Paper demonstrates that the aesthetic concepts of engineering design do not just arise; but that they are derived from various models of aesthetics. It also presents various Proportioning Systems and their application ...
  • Energy conservation in industry: motor drives 
    Wijayatunga, PDC; Daranagama, DAU [Conference-Full-text]
    A significant proportion of electrical energy generated is utilised in industrial motor drives in addition to it being used for electric lighting and heating. Also, oversized and under-utilised motors in the industrial ...
  • Evaluation of cost of unserved energy in Sri Lanka 
    Wijayatunga, PDC; Fernando, WJLS [Conference-Full-text]
    Quantitative reliability evaluation is an important aspect of power system planning and operation. The indices produced in these applications are utilised in a wide range of management decisions throughout a utility. One ...
  • An experimental method to determine the thermal conductivity of concrete 
    Nanayakkara, SMA [Conference-Full-text]
    This paper reports an experimental method developed to measure the thermal conductivity of concrete. This method involves the measurement of steady state temperature distribution across a cylindrical specimen of concrete ...
  • Improving the efficiency of electro discharge machining by dual voltage excitation 
    Jayasinghe, JAKS [Conference-Full-text]
    An Electrical Discharge Machine (EDM) is a vital machine used in manufacture of tools and dies. Its operation is based on discharge of an electrical current across the tool and the work-piece. Due to limitations of the ...
  • Influence of linings on stress and deformation in rock around tunnels 
    Puswewala, UGA; Gunatilaka, IRP; Hapuarachchi, CL; Nandasena, RM [Conference-Full-text]
    Stress distribution and deformation in rock around lined tunnel openings subjected to internal pressure are investigated by using plane strain finite element analysis. Two typical tunnel cross- sections, in the forms of ...
  • Internally, stabilized earth retaining systems with discarded tyres 
    Kulathilaka, SAS; Nawagamuwa, UP [Conference-Full-text]
    Internally stabilized earth retaining systems became popular and came into extensive usage over the last two decades due to the many advantages inherited in them. Different forms of internally stabilized earth retaining ...
  • Knowledge based software for loading and stability of ships 
    Wimalsiri, WK [Conference-Full-text]
    Loading and Stability calculations of ships became a more and more complicated and time consuming process as the ship sizes and design complexity increased. Accurate and efficient methods of evaluating and analysing stability ...
  • Optical characterstics of carbon based semiconductors 
    Munindradasa, DAI; Amaratunga, GAJ [Conference-Full-text]
    The photoluminescence (PL) in a-C:H:N was measured using a 2.4leV Ar ion laser line for varying N content. The PL results show a lowering of the PL peak energy and a spectral line width broadening as the N content in the ...
  • An over-current indica tor 
    Ranaweera, A; Chandanandana, D; De Silva, MTK; Hewawasam, HYA; Indika, K [Conference-Full-text]
    The over-current indicator indicates to the user that the current in a circuit is exceeding its rated value as soon as it occurs. The current is sensed by a current transformer (CT) and the rectified and regulated output ...
  • Passive concepts for improvement of thermal and visual comfort in houses in Sri Lanka 
    Jayawardane, AI; Jayasinghe, MTR; Attalage, RA [Conference-Full-text]
    One of the primary requirements of houses constructed in hot humid climatic conditions such as those prevailing in Sri Lanka is that those should be thermally comfortable for the occupants throughout the day and around the ...
  • Performance analysis of pedestal fans an experimental investigation 
    Sugathapala, AGT; Somarathne, PBI [Conference-Full-text]
    Performances of pedestal fans were analysed through experimental measurements of the induced flow field (velocity distribution) and the power consumption by two different types of fans. A test rig was constructed to ...