نتایج جستجو برای: concentration factor
تعداد نتایج: 1189546 فیلتر نتایج به سال:
فرسایش خاک یکی از مهمترین مسایل اقتصادی، اجتماعی و زیست محیطی جهان است. طبق اطلاعات موجود، آسیا بیش از سایر قاره ها مشکل فرسایش دارد و در این میان ایران دارای میزان فرسایش خاک بالاییاست. مدیریت حوزه های آبخیز در کاهش فرسایش مهم می باشد. در کشور ما اکثر حوزه های آبخیز، به ویژه حوزه های آبخیز کوهستانی، فاقد ایستگاه های اندازه گیری به تعداد کافی می باشند و گاه ایستگاه های ناقص برای مدت طولانی فاقد...
asymmetric polyethersulfone (pes) microfiltration flat sheet membranes were composed by the phase inversion method (pim) and were used as supports. composite membranes were fabricated by coating silicone rubber as selective layer. effect of different concentrations of pes and pdms and different solvent such as nmp, dmf and dms effects as pes solvents and support thickness and different coagulat...
Initiation of transcription of favored templates by Qi3 replicase requires a much lower GTP concentration than does transcription of templates that are selected against. Although the enzyme requires a high GTP concentration to initiate transcription of Qp RNA, the presence of the host factor substantially reduces the GTP concentration requirement. In addition, the Qi3 replicase preparation must...
a simple, rapid and low-cost scanner spectroscopy method for the glucose determination by utilizing glucose oxidase and cdte/tga quantum dots as chromoionophore has been described. the detection was based on the combination of the glucose enzymatic reaction and the quenching effect of h2o2 on the cdte quantum dots (qds) photoluminescence.in this study glucose was determined by utilizing glucose...
the effect of gibberellic acid (ga3) on jerusalem cherry (solanum pseudocapsicum l.) was evaluated at pot cultivation conditions. this study was performed in factorial test based on complete random design plan and 4 repeats with 12 treatments. the main factor was included spraying, drip and spraying + drip. secondary factor was included concentrations of ga3 at 0, 100, 200 and 400 mg.l-1 levels...
Surveying and analyzing different socio-economic, environmental and other aspects of regions indicate the level of their privileges, welfare and development. Difference among privileges of various regions have perpetually been under the influence of environmental capabilities, hard work spirit, historical features and ruptures, level of civilization and urbanization, ideologies and values and s...
امروزه، در بیشتر اراضی سرعت فرسایش خاک بیش از سرعت تشکیل خاک است. در نتیجه باعث تهی شدن منابع خاک و کاهش توانایی حاصلخیزی خاک می شود. در ایران استان گلستان به علت موقعیت جغرافیایی و اقلیمی آن و تخریب بالای منابع آن و همچنین به علت اینکه سطح وسیعی از اراضی از لس تشکیل شده دارای میزان فرسایش خاک بالایی می باشد. یکی از راه های تخمین میزان فرسایش و رسوب و بررسی میزان تلفات مواد غذایی خاک استفاده از...
The National Environmental Management: Air Quality Act of 2004 states that people have the right to clean air and a healthy environment. Residents of low-income settlements are exposed to high concentrations of indoor air pollution due to the burning of solid fuels such as low-grade coal and wood for space heating and cooking. Long term exposure leads to degradation in the quality of life exper...
Background & objectives: Since many plants have high efficiency in absorbing heavy elements, the use of phytoremediation is of great importance. The purpose of this study is to identify native plants that absorb heavy metals. Also, the possibility of using them in phytoremediation technology in soils contaminated with heavy metals (around the petrochemical industry of Razi fertilizer in Tehran ...
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