• 溶液中的盐份富集在聚合物分子的带电基团附近,并形成盐浓度梯度分布。

    Salts are enriched around electriferous groups of polymer molecules in solution, which formed a salt concentration gradient.

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  • 发现正则动量与空间相的梯度成正比。

    It is found that the canonical momentum is directly proportional to the gradient of space phase.

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  • 采用高梯度磁选可将铁锂云母从尾矿中有效分离。

    Zinnwaldite can be separated effectively by the high gradient magnetic separation from the tailing.

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  • 那么,这一函数的梯度是什么?

    Well, so, what's the gradient of this function?

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  • 问题是,不是所有向量场都是梯度。

    The problem is not every vector field is a gradient.

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  • 梯度和散度是完全不同的东西。

    OK, so divergence and gradients are completely different things.

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  • 用▽表示,这就是梯度的符号。

    You use this downward pointing triangle as the notation for the gradient.

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  • 问题是怎么找出梯度是这个的函数?

    The question is how do we find the function which has this as gradient?

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  • 那么它应该就是一个梯度场。

    Now it should be a gradient field.

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  • 维持啤酒泡沫稳定的是张力梯度。

    Tension gradients stabilize beer foam.

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  • 这就是健康方面的社会梯度。

    This is the social gradient in health.

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  • 举个例子,磁场就不是梯度。

    For example, magnetic fields certainly are not gradients.

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  • 为什么要说F是一个梯度场?

    F is a gradient field. Why?

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  • 如果有一个梯度场,那就能得到这个。

    We have said if we have a gradient field then we have this.

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  • 垂直于梯度的方向上,方向导数为零。

    The directional derivative in a direction that's perpendicular to the gradient is basically zero.

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  • 现在我们来看看梯度的第一个好性质。

    But, so here's the first cool property of the gradient.

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  • 梯度向量应该垂直于等值线。

    The gradient vector would be going perpendicular to the level.

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  • 怎样确定一个场是不是梯度?

    Yes? How do you determine whether something is a gradient or not?

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  • 指定精细的颜色梯度和模式。

    Specify elaborate color gradients and patterns.

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  • 现在,梯度向量是什么呢?

    Now, what's the gradient vector?

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  • 问题是a取多少时,这是一个梯度场?

    The question is for which value of a is this a gradient?

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  • 同样地,梯度也是把偏导数糅合到一起。

    Well, the gradient is also a way to package partials together.

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  • 我们已经知道,梯度是垂直于等值面的。

    We have seen that the gradient is perpendicular to the level surface.

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  • 如果有一个梯度场,它也是一个保守场。

    So, if you have a gradient field, it's what's called conservative.

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  • 方法应该是去计算出梯度。

    So, the way to do it is that we compute the gradient.

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  • 如果展示梯度的话,在这儿是看不到的。

    So, if actually show you the gradient, you can't really see it here.

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  • 这个函数的梯度是什么?

    What is the gradient of this function?

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  • 因此这不是一个梯度场。

    So, indeed, this is not a gradient field.

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  • 也就是向量场f实际上是一个函数的梯度。

    Say that f, our vector field is actually the gradient of some function.

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  • 很多向量场都不是梯度。

    A lot of vector fields are not gradients.

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