نتایج جستجو برای: sand filter
تعداد نتایج: 150867 فیلتر نتایج به سال:
آلتراسوند یکی از روش های تصویربرداری است که هیج ضرری برای بدن ندارد، بنابرین نسبت به سایر دستگاه های پزشکی از محبوبیت و کاربرد بیشتری برخوردار است. طراحی بورد front-end یکی از چالشهای بزرگ در طراحی دستگاه سونوگرافی است که در آن سیگنالهای مدوله شده از بدن با دامنه بسیار کم باز می گردند که می توانند در رنج فرکانسی 2 تا 12 مگاهرتز کار کنند. تکنولوژی روز سعی در کوچک کردن مدارهای الکترونیکی و کمینه ...
However, Kwon et al.’s analysis is not conservative for at least two reasons. First, it is likely that they substantially underestimated arsenic on hands. Kwon et al. reported, but apparently did not actually measure, total arsenic on hands. They washed hands, filtered the wash water, and measured soluble arsenic in the filtrate. Insoluble residue was measured as dry mass gain on the filters. T...
the liquid metal flow and the solidification behaviours in a multi-cavity casting mould of two automotive cast parts were simulated in three dimensions. the commercial code, flow-3d® was used because it can track the front of the molten metal by a volume of fluid (vof) method and allows complicated parts to be modeled by the fractional area/volume obstacle representation (favor) method. the gre...
To simulate the filtration and/or degradation of trickling sewage from leaky sewers through the non-water-saturated underground, sewage was trickled through sand of 0.4-2mm from the Rhine valley in glass columns of 125 cm length. For the same sewage the chemical oxygen demand (COD) removal was almost independent of low or high trickling rates. The COD removal efficiency varied, however, from 67...
The presence of particles such as algae, clay, organic materials and water-soluble substances often create turbidity or color in water. In recent years, electrocoagulation process has attracted an extensive attention due to its advantages. Since sand filters are widely used in water treatment industry and their corresponding backwash water is large in volume, turbidity removal will save water c...
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