فهرست مطالب

International Journal of Science
Volume:1 Issue: 1, 2000

  • تاریخ انتشار: 1381/01/11
  • تعداد عناوین: 5
|
  • Third Virial Coefficient and Compressibility Factors forDense Spherical Gases Using the HFD-C Potential
    Mohammad R. Rezaee, Nicholas M. Lemon Page 1
    Reduced third virial coefficients of several gases made of spherical molecules interacting with the HFD - C potential has been calculated as a function of the reduced temperature. A correlation equation C*(T*) For spherical gases is presented. Theoretical results have been compared with the experimental data for Ar, Kr, Xe, CH4, CF4, and SF6. Furthermore, the values of the compressibility factors have been obtained in the reducedtemperature range 1.5 £ T* £ 10 and reduced pressure range 0.02 £ P*£1.00. Satisfactory agreement is found between the theoretical and experimental results over the entire temperature and pressure range studied.
  • Some Production Comparisons of Two Celluloytic Fungi
    M. Zolnorian, M. Hamidi, R. Yazdanparast Page 2
    Eighteen fungal strains, with cellulolytic capabilities, were isolated from the microflora of Iran.All of the isolated fungal strains produced, under the preliminary conditions of growthand enzyme production, higher extracellular cellulolytic enzymes relative to Trichoderma reesei. For one of the isolated fungal strains, which turned out to belong to the Botrytis family and Trichoderma reesei optimized growth conditions were separately established. Maximum enzyme production for T.reesei, 400 mFPU/ml was achieved during 13 days of growth in a citrate/phosphate buffered media (pH=5) at 29°C. However, the isolated Botrytis sp. produced maximally 670 mFPU/ml by day 15th of growth at 29°C and in an unbuffered citrate system (pH=7).
  • Probe Diagnostics of Confined Plasma Produced by 13.56 MHz R.F Plasma Source
    M. Khorassani Page 3
    In an inductively coupled R.F plasma reactor, the plasma density increases smoothly for low increase of input power, but exhibits discontinuities or jumps. Variation of plasmatemperature and density has been studied by using both single and double Langmuir probes. Other measurements showed that there is smooth increase in the plasma density, by increasing magnetic coil current and the R.F power.Measurements have also confirmed earlier observations that the higher R.F power strongly depends on, to the higher chamber pressure and plasma potential.
  • Optimal Control of an Inhomogeneous Heat Problem by Using Measure Theory
    S.A. Alavi, A.V. Kamyad, M.H. Farahi Page 4
    In this paper we consider an optimal control problem for an inhomogeneous Heat equation. We transfer the problem into a moment problem. Then this moment problem is changed to measure theoretic control problem, and the new problem is converted to an infinite dimensional linear programming problem. Finally we approximate the infinite dimensional linear programming problem to a finite dimensional one and the solution to this problem is used to find a piecewise constant control for the original problem.
  • Diagenetic Studies, a Key to Reveal the Timing of OilMigration: an Example from the Tirrawarra SandstoneReservoir, Southern Cooper Basin, Australia
    Mohammad R. Rezaee, Nicholas M. Lemon Page 5
    Commercial accumulation of petroleum requires several essential elements and processes which should occur in a certain sequence. Any departure from this sequence will be against petroleum accumulation. Therefore, the timing of oil migration and its emplacement in a reservoir is very important for petroleum geologists. In the present work, a sequence of diagenetic events has been established for the Tirrawarra Sandstone utilizing petrographic studies, scanning electron microscopy, stable isotope, fluid inclusion microthermometry, electron microprobe analysis, cathodoluminescence observations and X-Ray diffraction. Based on an integrated study, the timing of oil migration has been constrained with relation to other diagenetic events. Entrapment of hydrocarbon between quartz and siderite cement phases has indicated that migration of hydrocarbon hasoccurred at temperature range between 80°C and 102°C.This paper discusses the diagenetic history of the Tirrawarra Sandstone reservoirs in detail and then correlates diageneticevents and the timing of hydrocarbon migration.