نتایج جستجو برای: onset of asphaltene precipitation
تعداد نتایج: 21179302 فیلتر نتایج به سال:
The molecular-mass distribution of the asphaltene fraction of petroleum is rapidly becoming more constrained, but themolecular architecture remains poorly understood. Two types of molecular structures have been proposed to be representative of asphaltenes: the “island” model and the “archipelago” model. Here, nine compounds were synthesized on the basis of pyrene, representing both types of mod...
Drought detecting is a necessary aspect of drought risk management. It is generally performed usingdifferent drought indices that are effectively continuous functions of rainfall and other hydro- meteorologicalvariables. A number of drought indices have been introduced and used in various countries to date. In thecurrent research, four meteorological drought indices including the standardized p...
Mehrgerd region of Semirom county has faced the water shortage for several years. The emergence of drought has led to a decline in water resources in recent years; and there are various reasons for climate change and increased consumption in order to reduce water resources. The present study aimed to investigate the process of temperature and precipitation variations and its possible effects on...
Carboxymethylcellulases (CMCases) of Arachniotus citrinus were produced under solid state fermentation on different carbon sources including wheat bran, corn cob, alkali treated corn cob and mixture of wheat bran and alkali treated corn cob at 30C for 15 days. In this case, mixture of wheat bran and corn cob was observed to be the best carbon source as maximum specific activity (4.2 U mg protei...
this paper presents the analysis of the onset and withdrawal dates and the duration of summer monsoon over nepal for last 63 years (1951-2013). the trend analysis revealed that both the onset and withdrawal of summer monsoon are delayed in recent years. the statistical analysis using cumulative deviation and worsley likelihood tests showed a step jump in mean withdrawal date after the year 1997...
The influence of different factors on the asphaltene stability in three iranian crude oils was evaluated. Compositional studies ...
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