نتایج جستجو برای: heavy work
تعداد نتایج: 1061047 فیلتر نتایج به سال:
in order to prevent contamination of heavy metals accumlation in soil, plant, and ground water, several methods of prevention are studied, and tested worldwide. one of the method which has not been studied and applied in iran is stabilization of heavy metals in soil by using clay minerals. clay minerals due to hydration properties can adsorb organic and inorganic substances. two clay minerals w...
Heavy organics deposition is a common problem in oil industry, especially in oil production, transportation and processing. Wax or solid paraffin series are examples of heavy organics that deposit. Precipitation and crystallization of wax causes major difficulties in different processes. Based on multi-solid theory, a basic model is modified in this paper for wax precipitation in different oils...
In the present research work, a low-ash coal, from Ghouzlou deposit in Iran, with an average ash content of 12% was subjected to some beneficiation experiments such as heavy media separation and flotation. Sieve analysis showed that 62.3% of the coal sample with the size of +2 mm had around 7.3% ash contents. Also, heavy media tests carried out on five size fractions revealed that by setting th...
Background : Clinical work is important part of nursing teaching. Nursing education to their responsibilities for teaching and researching are also responsible for integrating the knowledge and practice and offering service to community. Complexity of these responsibilities often cause a great deal of psychological stress. Objective : To determine level of stress perceived by nurse educator...
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