نتایج جستجو برای: bahrakan area
تعداد نتایج: 584141 فیلتر نتایج به سال:
bahrakan region is one of the four important and major areas of oil and economy in the persian gulf. the aim of this study was to evaluate the use of meiofauna as bioindicator of environmental pollution and the influence of organic contaminants on variation of meiofauna. sampling has done from 9 stations in three transects perpendicular to the intertidal shoreline, in the cold season (winter 20...
To taxonomic identification and density determination of medusae in Bahrakan area (Persian Gulf), planktonic samples were collected from 6 stations in July, August, October in 2010 and December, February and April in 2011. Sampling was conducted with 300µm mesh size plankton net. Environmental parameters such as salinity, pH, temperature and dissolved oxygen were measured. 5 species were identi...
This study was undertaken to survey impacts of bottom trawling on distribution and diversity of gastropods of the Bahrakan Fishing Area (BFA), of the northwestern coasts of the Persian Gulf. Gastropod samples were collected from depths of 6m and 10m at 18 randomly selected stations in three occasions, right before the opening of shrimp trawling seasonand two weeks and 3 months after the fish...
this research was conducted in two protect and destroy region in the middle zagros, in illam province. in order to identification of ecological species group and evaluate density of regeneration, effect of many factors such as protection, vegetation, physiographic factors, physical and chemical properties of soil in study locations were studied. to achieve these purpose number of 54 plots using...
applications such as high definition viedeo reproduction, portable computers, wireless, and multimedia demand, and ever-increasing need for ligh-frequency high-resolution and low-power analog-to-digital converters. flash, two-step flash, and pipeline convertors are fast but consume large amount of power and require large area. to overcome these problems, successive approximation converter blo...
the aim of this investigation was to study the planktonic shrimp-like communities density and diversity in artificial reefs of khuzestan coasts, bahrakan waters (the persian gulf). sampling was conducted for one year from may 2011 to april 2012, monthly. zooplankton were collected with plankton tows using 300 μm mesh net. totally, two superfamily, penaeoidea, sergestoidea and one suborder carid...
gol-e-gohar iron ore mine of sirjan in southern part of iran is a large open pit that operates below the groundwater table and during mining operation, dewatering is required to prevent operation processes from flooding. current operation is going on by digging wells in or out of the pit and pumping to prevent flooding. as a result of the former dewatering operation a vast deep cone of depressi...
چکیده : دو گیاه perovskia abrotanoides karel و zeravschania aucheri در سایه تحت جریان ملایم هوا خشک شدند. اسانس گیری از گیاهان خشک شده توسط دو روش تقطیر با آب و میکرواستخراج فاز جامد در فضای فوقانی انجام گرفت و اسانس ها با استفاده ار روش کروماتوگرافی گازی- طیف سنج جرمی (gc-ms) مورد تجزیه و تحلیل قرار گرفتند. ترکیبات عمده شناسایی شده در اسانس برگ و گل و ساقه گیاه p.abrotanoides عبارتند از: ...
nowadays, air pollution is a global problem that has had significant growth by technology development, population growth andindustrial development. industrial development brought natural resources deterioration, more manufacturing products, and more environmental pollutants. if pollutant won’t be controlled, human-being and wildlife will face the critical risks. significant release and critical...
یکی از مهم ترین عوامل موثر در وقوع آتش سوزی در مناطق خشک، پوشش گیاهی و شرایط آب و هوایی منطقه می باشد. منطقه حفاظت شده باغ شادی یکی از مناطق جنگلی استان یزد بوده که بیش ترین آتش سوزی های استان در آن رخ داده است. به منظور بررسی عوامل موثر بر وقوع آتش سوزی در این منطقه از روش تحلیل سلسله مراتبی (ahp) استفاده شد و معیارهای فیزیوگرافی شامل سه زیرمعیار ارتفاع، شیب و جهت شیب، اقلیم شامل دو زیرمعیار د...
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید