نتایج جستجو برای: water analysis
تعداد نتایج: 3284778 فیلتر نتایج به سال:
the present study reports an analysis of response articles in four different disciplines in the social sciences, i.e., linguistics, english for specific purposes (esp), accounting, and psychology. the study has three phases: micro analysis, macro analysis, and e-mail interview. the results of the micro analysis indicate that a three-level linguistic pattern is used by the writers in order to cr...
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...
multivariate statistical techniques such as cluster analysis, multidimensional scaling and principal component analysis were applied to evaluate the temporal and spatial variations in water quality data set generated for two years (2008-2010) from six monitoring stations of veli-akkulam lake and compared with a regional reference lake vellayani of south india. seasonal variations of 14 differen...
introduction acetic acid bacteria are large group of obligate aerobic gram negative bacteria with the ability to oxidize ethanol to acetic acid (1). they are widely distributed in natural habitats and classified in family acetobacteraceae. members of this family are useful in industrial production of vinegar(2). acetic acid bacteria (aab) can use substrates as glucose, ethanol, lactate or glyc...
This report describes the methods and procedures used by the U.S. Geological Survey Tritium Laboratory to analyze natural waters for tritium activity. Samples having low activity are electrolytically enriched in cells with nickel and steel electrodes, and their tritium concentration is subsequently determined by liquid scintillation and gas phase counting techniques. Samples having high tritium...
حدود 98 درصد آب های موجود در کره زمین شور می باشند و فقط 2 درصد از کل آب های موجود در کره زمین جزء آب های شیرین به حساب می آیند که از این مقدار 87 درصد شامل یخچال ها و مناطق قطبی است که غیر قابل استفاده می باشند. بنابراین فقط 2/0 درصد از کل آب های موجود در کره زمین قابل شرب می باشد که شامل آب های زیرزمینی، چشمه ها، رودخانه ها و دریاچه-ها می باشد. رشد جمعیت و توسعه صنایع موجب افزایش تقاضا و افزا...
در این تحقیق اثر ریتانسرین ( آنتاگونیست گیرنده سروتونینی 5-ht2) بر فراموشی ناشی از اسکوپولامین (آنتاگونیست گیرنده موسکارینی کولینرژیک ) در ماز آبی موریس morris water maze,mwm) ) بررسی گردید .
water quality is a worldwide problem which affects human beings lives fundamentally. water scarcity is intensified in result of quality deterioration. different factors such as population increase, economic development and water pollution could be considered as the origins of the problem. the study and forecasting of water quality is necessary to prevent serious water quality deteriorations in ...
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