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تعداد نتایج: 1343462 فیلتر نتایج به سال:
Scientific achievement in molecular biology and genetic engineering have made it possible to create new methods of selection k that are based on genome modification. Todays, more genetically modified plants being intensively tested the field, but their influence has not yet been fully studied environment, biodiversity, human health, animal body.
 The article analyzes results research prese...
In this article, a two dimensional pore scale model of polymeric fuel cell, which is promising of a clean and renewable energy production, is presented here. Let reactive gases behave as an ideal gas; inhomogeneous anisotropic structure of the gas diffusion layer, is contemplated as a random generated circular porous media. Lattice Boltzmann method is applied to inquire the fluid flow and mass ...
در این تحقیق میدان جریان عبوری از روی سرریزآزاد به کمک نرم افزار flow-3d شبیه سازی می کردد همچنین اثر هندسه سرریز و بلندای آب بالادست سرریز بر میدان جریان و توزیع فشار روی سرریز بررسی شده و تاثیر مدلهای مختلف 3-k برای تعیین آشفتگی در میدان جریان نیز مورد توجه بوده است نرم افزار flow-3d به عنوان یک برنامه تحلیلی میدان جریان براساس دیدگاه اولری معادلات حاکم بر میدان جریان عبوری از روی سرریز را که...
due to the increasing interest on renewable sources in recent years, the studies on integration of distributed generation to the power grid have rapidly increased. in order to minimize line losses of power systems, it is crucially important to define the size and location of local generation to be placed. minimizing the losses in the system would bring two types of saving, in real life, one is ...
The increase of current uniformity along a resistive type superconductor fault limiter (R-SFCL) in the design this limiters is well perceived as an important issue. non-uniform distribution R-SFCL only increases some superconducting regions, result, conditions, certain parts undergo phase change that heat pressure those areas and causes breakdown destruction device. In paper, density distributi...
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