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。
In the natural gradient algorithm, the convergence speed and stability error are two important indicators, but these two indicators are of inherent contradictions.
自然梯度算法有收敛速度和稳定误差两个重要指标，然而这两个指标存在内在的矛盾。
We use conjugate gradient method to improve the learning speed of the premise parameters.
用共轭梯度法提高其前提参数的学习速度。
The paper introduces a method that utilizes viscosity diagram to determine viscosity under any speed gradient. The viscosity defined is more close to the practical condition of well bore.
本文介绍一种用黏度图来确定任一速度梯度下黏度的方法，所定黏度更接近井眼实际情况；
Eddy currents will be caused in ambient conducting parts because of the rapid switch speed of current pulse in gradient coils.
梯度线圈中的脉冲电流具有很高的切换速度，这必然会在周围导电部件中引起涡流。
Variable step-size natural gradient algorithm which enjoys faster convergence speed and smaller stability error is proposed to solve the shortcoming of natural gradient algorithm.
为了解决自然梯度算法的这个缺点，人们提出了变步长自然梯度算法，既可以获得较快的收敛速度，又可以减小稳定误差。
The cooling speed gradient leads to a gradually changed microstructure of the fused materials.
依冷凝速率梯度不同，该组成样品可以获得显微结构渐变的熔融材料。
This article describes drainage design principle for planted roof, and puts forward that increasing drainage gradient of both roof and growing medium layer could speed up water discharge.
叙述了种植屋面的排水设计原则，提出可通过加大屋面排水坡度和种植介质表面排水坡度等措施，达到快速排放屋面积水的目的。
And the same time the lower permeability is the greater starting pressure gradient and the more slow speed of pressure conduction is.
且渗透率越低，启动压力梯度越大，压力传导速度越慢。
Many researches showed that, the coalescence is the main reason to speed up the movement of drops on the surface with gradient surface energy and separate from the surface in dropwise condensation.
已有的研究工作表明：液滴的聚合是加快梯度能表面材料表面上液滴运动和滴状凝结中液滴快速运动的主要原因。
A fairly pure preparation can be obtained through two runs of low-speed centrifugation and a single run of high-speed centrifugation in sucrose gradient.
主要是经过两次低速离心，一次蔗糖梯度超速离心，即可得到一定纯度的细胞膜。
The pressure gradient and entrainment of vortexes are main reasons that synthetic jet actuator controls low speed primary jet direction.
压强梯度的存在和旋涡的卷吸作用是合成射流激励器控制宏观低速流流动方向的主要因素。
Results also show that decrease of pressure gradient in winter and spring influences dust weather frequency by affecting wind speed indirectly.
冬春季节气压梯度的减小是风速减小、进而导致沙尘日数减小的关键间接因素。
The temperature gradient is very great in the rolling zone under the ultra thin high speed roll casting condition, and the rolling pressure is strongly coupled function of the temperature.
超薄快速铸轧条件下轧制区内温度梯度很大，其轧制压力是温度的强耦合函数。
The results showed that it has features of low wind speed and small in vertical gradient of the wind speed in Sichuan basin.
结果表明，四川盆地具有风速小，且风速垂直梯度亦小的特征；
In high speed drawing process, the pressure gradient of coating in die determines the magnitude of centering force and the concentricity of coating layers.
高速拉丝过程中，模具中涂料的压力梯度决定了对中作用力和光纤涂层同心度的大小。
It is applied for the special line with steep gradient and small radius of curvature. This tourist car which runs with light load and low speed has high safe ty performance.
这是一种用于旅游胜地的新型环保车，适用于大坡道、小曲率半径的特殊线路，轻载低速，安全性能高。
Methods Newcastle disease virus(NDV) was prepared in embryonic egg. NDV was purified by deposited of PEG-6000, speed centrifugation and sucrose—density gradient—centrifugation(SDGC).
方法利用传统鸡胚培养方法制备新城疫病毒（NDV），通过PEG-6000沉淀，差速离心和蔗糖密度梯度离心等方法提取纯化了新城疫病毒（NDV）。
Methods Newcastle disease virus(NDV) was prepared in embryonic egg. NDV was purified by deposited of PEG-6000, speed centrifugation and sucrose—density gradient—centrifugation(SDGC).
方法利用传统鸡胚培养方法制备新城疫病毒（NDV），通过PEG-6000沉淀，差速离心和蔗糖密度梯度离心等方法提取纯化了新城疫病毒（NDV）。
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