Volume: 4
Number: 1
January-June 2005

To see an article directly, click its Title. To see abstract, click its [Abstract] link.

• AERODYNAMIC CHARACTERISTICS OF TWO-,THREE-AND FOUR-BLADED STATIONARY SAVONIUS ROTORS
  M. Quamrul Islam, M. Sharif-ul-Hasan, F.H.Chowdhury
  Abstract PDF
  AERODYNAMIC CHARACTERISTICS OF TWO-,THREE-AND FOUR-BLADED STATIONARY SAVONIUS ROTORS
  M. Quamrul Islam, M. Sharif-ul-Hasan, F.H.Chowdhury

  Abstract

  static torque and drag coefficients of a stationary Savonius rotor with two,three and four blades have been investigated by measuring the pressure distribution on the blade surfaces for different rotor angles. Experiments have been perforned at a Reynolds no. 1.8 x 105 with rotors having semicircular blade profile with an overlap ratio of 0.2. Results indicate that static torque coefficients vary considerable with the rotor angle. three results were used to compare the performance of two-,three-and four bladed Savonius rotors under dynamic conditions.
• EZPERIMENTAL INVESTIGATION ON EFFECT OF MINIMUM QUANTITY LUBRICATION (MQL) IN MACHINING STEEL
  N.R. Dhar, S. Islam, M. Kamruzzaman
  Abstract PDF
  EZPERIMENTAL INVESTIGATION ON EFFECT OF MINIMUM QUANTITY LUBRICATION (MQL) IN MACHINING STEEL
  N.R. Dhar, S. Islam, M. Kamruzzaman

  Abstract

  application of cutting fluids changes the performance of machining operations because of their lubrication, cooling, and chip flushing functions. in the machining of hardened steel materials, no cutting fluid is applied in the interest of low cutting forces and low environmental impacts. Minimum quantity lubrication (MQL) presents itself as a viable alternative for turning with respact to tool wear, heat dissertation, and machined surface quality. this study compares the mechanical performance of minimum quantity lubrocation to compaletely dry lubrication for the turning of steel based on experimental measurement of cutting temperature, chip reduction coefficient, chip shape and color, surface finish and dimensional deviation. Results indicated that the use of near dry lubrication leads to lower cutting temperature, favorable chip-tool interaction, reduced surface roughness and dimensional deviation.
• DROPLET COMBUSTION WITH LIQUID PARAFFIN AND OXYGENATED FUELS
  Md. NurunNabi, Hideyaki Ogawa, Noboru Miyamoto
  Abstract PDF
  DROPLET COMBUSTION WITH LIQUID PARAFFIN AND OXYGENATED FUELS
  Md. NurunNabi, Hideyaki Ogawa, Noboru Miyamoto

  Abstract

  In this report single liquid fuel droplet combustion of neat diesel fuel, neat oxygenated fuels, blends of diesel- paraffin and diesel-oxygenated fuels have been investigated. The volumetric blending ratios of paraffin and oxygenated fuels to diesel fuel have been set to 0, 25, 50 and 100%. The result showed that the shapes and sizes of the flames of diesel-paraffin and diesel-oxygenate fuel blends were completely differents from those of conventional diesel fuel. It has been interesting to note that the combustion with the blends of diesel -paraffin and diesel-oxygenate ended rapidly after the ignition started. Compared with neat diesel fuel, the combustion speed was found faster for low temperature paraffin fuels includung normal nonane (NN) and normal decane (ND) as well as oxygenated fuels, such as, ethylene glycol monon butyl ether (ENB) and diethyl succinate (DES). The rapid changes of combustion might result from the micro explosion of the fuel droplet for their low boiling temperature.
• TECHNICAL & VOCATIONAL EDUCATION AND HUMAN RESOURCE DEVELOPMENT: TRENDS TOWARD A CLOSER INTERGRATION
  CheKum Clement
  Abstract PDF
  TECHNICAL & VOCATIONAL EDUCATION AND HUMAN RESOURCE DEVELOPMENT: TRENDS TOWARD A CLOSER INTERGRATION
  CheKum Clement

  Abstract

  The new work environments require broader skills than ever before and place intense pressures on all providers of workforce preparation to enhance the competitiveness of today's workforce. Technical & vocational education (TVE) and human resource development (HRD) are in the forefront in seeking new approaches to preparing the workforce of the future. This paper presents arguments that trends toward a closer integration of the two fields are appropriate responses to meet the challenges and should be pursued more vigorously. Historical, philosophical and practical contributions of both fields are examined as foundations of commonality upon which to build cooperative efforts. Analyses revealed substantial basis for cooperation that is largely overlooked Integrative mechanisms and initiatives are discussed.