فهرست مقالات absorption rate

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  1 - بررسی میزان تاثیرات تغییر پارامترهای فیزیکی بر اندازه‌ی نرخ جذب ویژه در مدل سر انسان مبتنی بر استاندارد IEC 62209-1
  اسما لک همایون عریضی علیرضا ملاح زاده
  در این مقاله ابتدا به بررسی اثرات بیولوژیکی امواج الکترومغناطیسی فرکانس بالا بر بدن پرداخته می شود. سپس میزان نرخ جذب ویژه (SAR)و عوامل موثر بر آن بررسی می گردد و در ادامه میزان SAR در مدل استانداردIEC-66209 شبیه سازی شده که در آن بافت سر و یک آنتن موسوم به دایپل مرجع م چکیده کامل

  در این مقاله ابتدا به بررسی اثرات بیولوژیکی امواج الکترومغناطیسی فرکانس بالا بر بدن پرداخته می شود. سپس میزان نرخ جذب ویژه (SAR)و عوامل موثر بر آن بررسی می گردد و در ادامه میزان SAR در مدل استانداردIEC-66209 شبیه سازی شده که در آن بافت سر و یک آنتن موسوم به دایپل مرجع مدل شده واثر تغییر پارامترهای فیزیکی بر SAR مثل رسانندگی بافتها، اثر دادن زاویه (تیلت) به آنتن, اثر کوچکتر شدن اندازه، اثر فاصله گرفتن از آنتن، تغییر محل اندازه گیری SAR و میزان SAR در دست انسان شبیه سازی شده و با مدل استاندارد مقایسه شده است. شبیه سازیها همگی در فرکانسMHz 835 انجام شده است (به جز در مورد اثر تغییر فرکانس). پرونده مقاله
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  2 - Effect of the Physical Properties of Composite Packaging Materials on Keeping Quality of Smoked Catfish
  Olayemi, Foline Folorunsho Raji, Abdulganiy Olayinka Bamishaiye, Eunice Iyabo
  Six different composite packaging materials were tested with the trades’ practice of polythene bags in storing smoked catfish for a period of six months. The thickness of the packaging materials ranges from 0.23 to 046 mm with water and oil absorption rates of the چکیده کامل

  Six different composite packaging materials were tested with the trades’ practice of polythene bags in storing smoked catfish for a period of six months. The thickness of the packaging materials ranges from 0.23 to 046 mm with water and oil absorption rates of the packaging materials varies from 0.23 to 10.00 and 0.28 to 10.857 glcm2/mm respectively. The impact resistance weight also varies from 25 to 50 gm. It was observed that the physical properties of the packaging materials are related to the keeping quality of the stored catfish. The two packaging with better engineering properties offered better barrier functionality that gave better keeping quality for the catfish. [O, Foline Folorunsho et al. Effect of the Physical Properties of Composite Packaging Materials on Keeping Quality of Smoked Catfish. International Journal of Agricultural Science, Research and Technology, 2011; 1(3):127-131]. پرونده مقاله
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  3 - Effect of Natural Pozzolan on Concrete’s Mechanical Properties and Permeability in Various Grades of Cement
  Farhad Pirmohammadi Alishah Mehdi Mohammad Razaei
  10.30495/geotech.2020.680492
  Pozzolan is an additive to cement clinker that if added to the high quality cement and concrete, it can be effective in enhancing the quality of cement and concrete resulting from high quality controlled precision and repeated sampling and continuous testing. Concrete c چکیده کامل

  Pozzolan is an additive to cement clinker that if added to the high quality cement and concrete, it can be effective in enhancing the quality of cement and concrete resulting from high quality controlled precision and repeated sampling and continuous testing. Concrete creates the cement-free concrete without any additives. Documentary reports and rigorous scientific studies have shown that good pozzolan can, in addition to increasing the chemical resistance of concrete, eliminate the defects caused by the use of conventional cement in concrete and due to the diversity of water and soil use in different areas. In this study, the effect of natural pozzolan in different grades of cement on the mechanical properties and permeability of concrete at 7 and 28 days of age is investigated. It was found that with increasing cement grade, the water absorption rate of concrete increased. Also, the effect of pozzolan on the permeability of concrete samples is increased by increasing the pozzolan water absorption rate. Also, the effect of cement grade on the compressive strength of concrete was found to decrease with increasing concrete grade. Today using alternative sources in concrete productions is important, due to its economical and environmental considerations. Pozzolans are one of these resources which decrease the environmental pollutions and production costs of concrete structures. پرونده مقاله