I mean we'd seen in last time, but the gradient is perpendicular to the level and points towards higher values of a function.
我的意思是，上一次我们讨论过了，这个梯度是垂直于等高线，并且是指向方程增长的方向的。
We know that the gradient is perpendicular to this vector that's tangent to the level surface What about other vectors tangent to the level surface?
我们知道梯度向量垂直于这个向量，而速度向量是相切于等值面的，其他相切于等值面的向量，又如何呢？
We have seen that the gradient is perpendicular to the level surface.
我们已经知道，梯度是垂直于等值面的。
But they won't be the level curves of a function for which this is the gradient.
但它们不一定是，某个以该向量场为梯度的函数的等值线。
The gradient vector would be going perpendicular to the level.
梯度向量应该垂直于等值线。
That means that the gradient of f is perpendicular to the level set of g.
也就是说f的梯度向量,应该与g的水平集垂直。
But we know another vector that is also perpendicular to the level set of g. That is the gradient of g.
但我们知道有另外一个向量也是和g的等值面垂直的，这个向量就是g的梯度。
Then you know that the gradient of g is perpendicular to the level surface.
那么就知道了g的梯度,是垂直等值面的。
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。
So-called gravity anomaly linear structure signal is derivative of gravity anomaly level total gradient on gravity direction, and the derivatives must be greater than zero.
所谓重力异常线性构造信号就是重力异常水平总梯度沿重力方向的一阶导数且是大于零值的那一部分。
Both sides isopleth width of gravity anomaly linear structure signal is more narrow than that of gravity anomaly level total gradient.
重力异常线性构造信号极大值两侧的等值线分布范围比重力异常水平总梯度的极大值两侧等值线分布的范围要窄。
The speed function defined in Level set method can be divided into two classes: function based on the gradient of image and function based on the image gray.
水平集方法的速度函数定义根据所利用的图像信息可以分为两大类：基于图像梯度和基于图像灰度信息。
Distribution difference of the birds in the reserve occurred not only on level pattern but also on an altitudinal gradient.
保护区鸟类的分布，不仅在水平格局上存在一定的地域差异，而且在海拔梯度上也有明显的差异。
The result indicate that urbanization level in Jiangxi is consistent with the city efficiency relevant overall, accord "the city scale efficiency gradient" phenomenon.
结果表明，江西省的城市化水平与城市效率的相关性总体一致，符合“城市规模效率梯度”现象。
Water level gradient is an important environmental gradient in wetland, the research of reaction of wetland plant to water level gradient is an important content of wetland ecology.
湿地中，水位梯度是一个重要的环境梯度，湿地植物沿水位梯度式样反应的研究是湿地生态学重要的研究内容之一。
The developing level of the technology of producing in-situ gradient composites in outside force field (centrifugal method and electromagnetic separation method)has been reported.
综述了利用外力场（离心铸造法和电磁分离法）制备自生梯度复合材料的研究现状。
But the level of maturity of organic matter in the source rocks is obviously lower, because the lower tertiary source beds are of shallower burial and smaller geothermal gradient.
但由于生油层埋藏较浅，地温梯度偏低，致使各生油层有机质的成熟度明显比好生油凹陷低，主要生油层目前仍处于低成熟—成熟演化阶段。
Water potential reflects energy level of soil water and the gradient of water potential is an impotent factor describing direction and velocity of water flow.
水势反映土壤水的能态，而水势梯度则是决定水流方向和速度的重要因素。
Due to groundwater pumping the water level is lowered, the buoyancy in covering soil is decreased, the hydraulic gradient and flow velocity are increased, and the corrosion is enhanced.
抽汲地下水降低了地下水位，使上覆土层浮托力减小，水力坡度和流速增大，潜蚀作用加强。
This paper analyzes air source in heating system, states that gas is harmful in the system, points out level pipe gradient being small in single measure system, and velocity of flow must keep great.
本文通过分析采暖系统中的空气的来源，提出空气在系统中的危害，针对单户计量系统中水平管坡度较小，提出水平支管中水流速应保持较大。
Proposed a new brain tumor segmentation method based on the level set method using the gradient and the intensity distribution information in magnetic resonance images.
根据脑肿瘤在核磁共振图像上的梯度以及图像中点的强度分布提出了一种新的基于水平集的分割方法。
Gradient of liquid level increases with the increase of liquid flow and the height of weir.
液面梯度随液体流量的增加而增加，随堰高的增加而增大。
Considering the influences of acceleration, buffer journey and gradient, five-level buffer force is redesigned under utmost horizontal shock landing condition.
综合考虑加速度响应峰值、行程和缓冲力梯度的影响，在极限水平冲击工况下设计了新的五级分布缓冲力。
On the basis of the analysis of factors affecting the river water level, the BP neural network model, based on the gradient descending algorithm, is used to calculate the river water level.
在分析影响河道水位因素的基础上，采用基于梯度下降算法的BP神经网络模型推算河道水位，同时采用传统的上下游水位线性相关方法进行水位推算。
In this paper, an automatic approach for thresholding based on gray level gradient co occurrence matrix model and the maximum entropy principles is proposed.
提出了一种基于灰度-梯度共生矩阵模型和最大熵原理的自动阈值化方法。
Therefore, it is necessary to establish a micron level continuum theory (strain gradient plasticity theory) considering the intrinsic material length.
因此非常有必要建立一个包含内禀材料长度的微米尺度连续统理论（应变梯度塑性理论）。
Entropy thresholding method is an automatic technique for thresholding of digital images based on gray level-gradient co-occurrence matrix and the maximum entropy principle.
它包括二维匹配滤波预处理以增强血管的灰度，以及用灰度-梯度共生矩阵的最大熵阈值化方法。
Combining the two essential characteristics of the image, the gradient and the gray level, a threshold segmentation approach using maximum entropy with the gradient boundary control was proposed.
结合梯度和灰度这两种图像的本质特征，提出一种基于边界梯度控制的最大熵阈值分割方法。
Specially, we design a mechanical gradient to adjust the level of the accelerometer in order to improve the precision of apparatus.
设计了机械调平装置用以调节水平，提高仪器的检测水平。
Increasing of water and decreasing of gradient of channels, the flood water level rose abnormally in some local sections of river.
来水量增多而河道比降变小，造成局部洪峰水位异常壅高。
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