The parabolic barrier, double barrier with a rectangular well, double barrier with a parabolic well structure and the potential barrier placed in an external field are discussed here.

利用该结果分别研究了抛物线型单势垒情况、方型双势垒情况、抛物线型双势垒情况以及置于外场中的双势垒情况。

youdao

Well, we can do that in rectangular coordinates dz dx dy where dV becomes something like, maybe, dz dx dy, or any permutation of these.

我们在直角坐标系中处理，在这里dV有可能变成，或者它们的其他排列。

youdao

The volume code block in Listing 5 computes the cubic volume of a rectangular solid using the well-known formula.

清单5中的volume代码块使用常用公式计算长方体的体积。

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With the sets of basic specifications and features set in stone, HTC's engineers can then offer the right phone sizes that meet the carriers' requirements, as well as showing a relatively bland rectangular ABS block as an indication on how much space is needed to pack all the components.

ENGADGET: HTC talks smartphone design: from inception to final product