OK, the best way to it, now that we have the gradient vector, is actually to directly say oh, we know the normal vector to this plane.
最好的方法是，既然我们已经有了梯度向量，就可以直接说,我们知道了切平面的法向量。
The normal vector will just be the gradient.
法向量就是梯度向量。
And we know how to find a normal vector to the level set, namely the gradient vector is always perpendicular to the level set.
我们是知道如何去求水平集的法向量的，也就是垂直于水平集的法向量。
By very simple mathematical derivations, the practical expression of (Vzz), the expression of normal vertical gravity gradient, and the comment on the accuracy were given.
本文以极简单的数学推导，给出了正常重力垂直梯度的实用表达式，并对其精度作出了评价。
Objective: to establish a curve of dosage gradient liver signal intensity of superparamagnetic iron oxide (SPIO) in normal rats and to find an appropriate dose for enhancement.
目的：研究正常大鼠肝脏磁共振的超顺磁性氧化铁(SPIO)剂量梯度-肝脏信号曲线，寻找合适的增强剂量。
Result: Compared with normal PCR, Gradient PCR could identify the the optimal annealing temperature of aldosterone synthase gene.
结果：与普通pcr相比，梯度PCR能够迅速地确定CYP11B2基因的最佳退火温度。
The pressure gradient of the anti-lock braking system (ABS) was experimentally studied using an ABS hydraulic test bench for various conditions including normal brake, on-off brake, and step brake.
利用防抱制动系统（ABS）液压实验台，进行了ABS压力梯度多种工况的实验测试，包括普通制动、长加长减制动和阶梯增压、减压制动等工况研究。
Meathod: The experiment adopted density gradient centrifuging to separate PBMC of 44 patients with CHF and 20 normal person and enzyme digestion to separate neonatal rat cardiac myocyte.
方法：密度梯度离心法分离44例CHF患者和20例正常人PBMC，酶消化和差速贴壁法分离乳鼠心肌细胞。
The sound field of normal modes in the. shallow-water having negative velocity gradient and rough interface are calculated using such results.
文中用其结果计算了具有粗糙界面的负声速梯度浅海中的简正波声场。
The comparison is made between the numerical results of 3DBLE with and without normal pressure gradient.
比较了考虑与忽略旋转引起的法向压力梯度对计算结果的影响。
The revision of the image gradient is to revolve it to the reverse direction of the normal vector's projection on the image plane.
图像梯度修正是将图像梯度方向旋转到尽量与法向量在图像平面的投影反向一致的方向上。
The revision of the image gradient is to revolve it to the reverse direction of the normal vector's projection on the image plane.
图像梯度修正是将图像梯度方向旋转到尽量与法向量在图像平面的投影反向一致的方向上。
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