The positions of springs are determined by permeable depressions in the surface of the ground below the general level of saturation, and frequently also by the holding up of that level locally by comparatively impermeable strata, sometimes combined with a fault or a synclinal fold of the strata, for
An icon of a desk calendar. An icon of a circle with a diagonal line across. An icon of a block arrow pointing to the right. An icon of a paper envelope. An icon of the Facebook "f" mark. An..查看文章
It is trapped in, unusually impermeable, hard rock or in a sandstone or limestone formation, typically where the conventional gas resources also occur. Generally, these reservoirs occur freq..查看文章
In 2 similar, placebo-controlled, randomized trials, investigators tested whether dust-mite-impermeable bed covers improve health outcomes in patients with asthma or allergic rhinitis. In a..查看文章
New experiments by researchers at The University of Manchester have placed the best limits yet on impermeability of graphene and other two-dimensional materials to gases and liquids. The wor..查看文章
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