نتایج جستجو برای: soroosh and nowrooz fields
تعداد نتایج: 16857791 فیلتر نتایج به سال:
in this thesis, a new optically active poly(amide-imide) (pai) was synthesized by the indirect polycondensation reaction of the l-phenylalanine based diacid chloride and 4,4?-diaminodiphenylether in the presence of triethylamine in n-methyl-2-pyrrolidone. the formation of pai was confirmed by ftir, 1h nmr and elemental analysis. in next step, the surface of titanium dioxide (tio2) nanoparticles...
the methods which are used to analyze microstrip antennas, are divited into three categories: empirical methods, semi-empirical methods and full-wave analysis. empirical and semi-empirical methods are generally based on some fundamental simplifying assumptions about quality of surface current distribution and substrate thickness. thses simplificatioms cause low accuracy in field evaluation. ful...
abstract: mineral scaling in oil and gas production equipment is one of the most important problem that occurs while water injection and it has been recognized to be a major operational problem. the incompatibility between injected and formation waters may result in inorganic scale precipitation in the equipment and reservoir and then reduction of oil production rate and water injection rate. ...
http://dx.doi.org/10.1016/j.jhydrol.2015.10.047 0022-1694/ 2015 Elsevier B.V. All rights reserved. ⇑ Corresponding author at: Dept. of Civil & Environmental Engineering, E/4130 Engineering Gateway, OFFICE: EH 5308, Mail Code: 2175, Irvine, CA 92697, United States. Tel.: +1 949 824 8821. E-mail address: [email protected] (P. Nguyen). Phu Nguyen a,d,⇑, Andrea Thorstensen , Soroosh Sorooshian , Kuolin...
there are two major theories of measurement in psychometrics: classical test theory (ctt) and item-response theory (irt). despite its widespread and long use, ctt has a number of shortcomings, which make it problematic to be used for practical and theoretical purposes. irt tries to solve these shortcomings, and provide better and more dependable answers. one of the applications of irt is the as...
abstract chickpea is weak in competition of weeds that damages to it at between 40 t0 60 percent. kermanshah province is one of the most important region for chickpea fields in iran. for these reosons, weed management is necessary in this crop. in order to evaluate of herbicides and stubble control on broad leave weeds control in chickpea. experiment was conducted in agricultural research stat...
what: 50 participants from precipitation research community met to develop a list of research priorities and recommendations in the field of remote sensing of precipitation whEn: 15–17 March 2010 whErE: University of California, Irvine Overview Of recOmmendatiOns (i) Uncertainty of merged products and multisensor observations warrants a great deal of research. Quantification of uncertainties an...
یک فضای مینکوفسکی ، یک فضای برداری حقیقی با بعد متناهی، مجهز به یک تابعک مینکوفسکی f می باشد. به کمک مشتقات جزیی مرتبه دوم می توان یک متریک ریمان روی این فضای برداری معرفی کرد و ابر رویه شاخص s=f-1(1)را به عنوان یک زیر منیفلد ریمانی آن در نظر گرفت هدف در این پایان نامه مطالعه میدان های برداری آفین روی فضای برداری است. که بطور همزمان نسبت به متریک فانک وابسته به ابررویه شاخص نیز آفین هستند. یک ک...
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