Volume 2, Issue 3

 

ارسال های اخیر

  • Application of Boundera Element Method (Bem) to Two-Dimensional Poisson's Eqation 

    Hakimhashemi, M.؛ Karami, Ghodratollah (Materials and Energy Research Center, 1989-11-01)
    BEM can be used to solve Poisson's equation if the right hand side of the equation  is constant because it can easily be transformed to an equivalent Laplace equation. However, if the right hand side is not constant, then ...

  • Strengthening Mechanisms in the Aged 2024 and 7075 Aluminium Alloys 

    Jenabali Jahromi, S. A.؛ Janghorban, K. (Materials and Energy Research Center, 1989-11-01)
    Aluminum 2024 and 7075 alloys which are widely used in aerospace and marine applications were chosen to investigate their strengthening mechanisms. Using differential thermal analysis (DIA), metallography and tension tests, ...

  • Heat Transfer in a Column Packed With Spheres 

    Khoshravan-Azar, Esmaeil (Materials and Energy Research Center, 1989-11-01)
    The purpose of the study is to investigate average and local surface heat transfer coefficients in a cylinder packed with spheres. Here the term «local» applies to a single sphere within the bed. Averages are derived from ...

  • Solidification in Copper Continuously Cast in Graphite Moulds 

    Algie, S.H.؛ Ghasemzadeh, R. (Materials and Energy Research Center, 1989-11-01)
    A mathematical model of heat transfer in continuous casting copper slabs capable of producing experimental data has been constructed and validated against experimental data provided by the management of Copper Refineries ...

  • Improvement of Collapsibility of Sodium Silicate Bonded Cores for Aluminium Casting 

    Hedjazi, J. (Materials and Energy Research Center, 1989-11-01)
    This paper examines the compressive strength of sodium silicate bonded cores for aluminum casting with different additives. Various materials are used as additives among which it is found that 5% sand size bauxite has the ...

  • The Cost of Road Accidents in Iran 

    Ayati, E. (Materials and Energy Research Center, 1989-11-01)
    This paper gives an up-to-date estimate of the costs of road accidents in Iran. Conventional methods of estimating costs are considered together with special factors which apply to Iran. An attempt is made to quantify ...

  • Sucrose Inversion by Saccharomyces Yeast Cells Immobilized on to Corn Grits 

    Alemzadeh, Iran (Materials and Energy Research Center, 1989-11-01)
    Sucrose hydrolysis was carried Out by Saccharomyces strains. The effective rate of reaction was examined experimentally for 5 different Saccharomyces strains. Two Strains of Schizosaccharomyces and Saccharomyces Carlsbergensis ...

  • Rural Road Traffic Accidents in Iran 

    Ayati, E. (Materials and Energy Research Center, 1989-11-01)
    An up-to-date review of rural road accident statistics for Iran is presented The review considers sources of accident statistics in Iran and the means by which they are collected. The statistics are considered in relation ...

  • Lightning Protection of Ehv Substations in Iran 

    Vahidi, B.؛ Abedi, M. (Materials and Energy Research Center, 1989-11-01)
    Extra high voltage (EHV) substations are extremely vulnerable to the hazard of lightning strokes therefore, the shielding of these substations with a highly reliable protective scheme (shield wires) is an essential ...

  • Planning Robot Motion in a 2-D Region with Unknown Obstacles 

    Lucas, C. (Materials and Energy Research Center, 1989-11-01)
    The purpose of this paper is to present several algorithms for planning the motion of a robot in a two-dimensional region having obstacles whose shapes and locations are unknown. The convergence and efficiency of the ...

  • A Parametric Cathment Erosion Model 

    Samani, N. (Materials and Energy Research Center, 1989-11-01)
    The structural framework for a parametric catchment erosion model is proposed. A parameter optimization technique that provides a rational basis for the calibration of the model is developed. The adequacy of the model in ...

  • Polymer Impregnation of Concrete by Methyl Methacrylate and its Effects on Mechanical Properties and Corrosion of Steel in Concrete 

    Dehghanian, R. (Materials and Energy Research Center, 1989-11-01)
    Freezing and thawing resulting from the ingression of water into concrete causes cracking or spalling. Corrosive ions such as chloride or sulfate penetrate the concrete surface and eventually reach the reinforcing steel. ...