نتایج جستجو برای: water resourse system
تعداد نتایج: 2700237 فیلتر نتایج به سال:
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one of the most commonly used techniques to reduce the corrosion rate of rebar in concrete is addition substances named corrosion inhibitors into the concrete. corrosion inhibitor is chemical compounds that were added to concrete to prevent corrosion of steel in concrete. sodium nitrate is a type of anodic inhibitors that this study investigatesthe effect of this inhibitor on the properties of ...
the effects of natural zeolite as a bed medium in increasing lettuce and red tilapia growth as well as improvement of water quality parameters in an aquaponic system were investigated. an experiment with a completely randomized design was run with two treatments in triplicates, 1) an aquaponic system without use of zeolite as a control group and 2) use of a small cotton bag, containing 10 g zeo...
the aim of this study was to investigate the impact of management information system on employees’ performance of tehran province water and wastewater company in district 5. the present study was an applied research in terms of purpose and a descriptive correlational survey in terms of method. cochran's formula was used to determine sample size which was 219 employees. the statistical samp...
Recognition of effective factors in creating job satisfaction can be useful in increasing it in faculty members and gives them motivation , which in turn promotes educational and research purposes. Considering this important issue, the present study was conducted to determine the job satisfaction level of the faculty members of Lorestan university of medical sciences in 2007. Materials and Met...
The results of studies five sunflower cultivation variants within the production system ExpressSun™ on ordinary chernozem for 2013-2019 in southeastern European part Russia (the hydrothermal index growing season – hereinafter HTI is 0.70) are presented. It was found that when switching to systemic principle formation, technologies based differentiated soil tillage crop rotation provided an incr...
Background: Continuous expansion of potable water pollution sources is one of the main concerns of water suppliers, therefore measures such as water safety plan (WSP), have been taken into account to control these sources of pollution. The aim of this study was to identify probable risks and threatening hazards to drinking water quality in Lighvan village along with assessment of bank filtratio...
rivers and runoff have always been of interest to human beings. in order to make use of the proper water resources, human societies, industrial and agricultural centers, etc. have usually been established near rivers. as the time goes on, these societies developed, and therefore water resources were extracted more and more. consequently, conditions of water quality of the rivers experienced rap...
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