条件梯度法

Firstly, the three-dimension boundary question and its corresponding variation question concerning the point-source electrical field on a 3-D structure are presented. Secondly, the finite element method is used to solve the variational equation. The study area is divided into many tetrahedral elements. Then, we interpolate with a tri-linear function in each element. So, the variational equation is converted into a linear equation system. Finally, taking into account saving of time, we make use of symmetric successive overrelaxation preconditioned conjugate gradient algorithm to solve large linear system, and obtain the potential value of each node, resulting in the calculation of the apparent resistivity values on the ground surface.

首先给出了三维构造中点源电场的边值问题以及相应的变分问题；然后利用有限单元法求解变分问题，采用四面体单元对研究区域进行剖分，在单元中进行三线性函数插值，将变分方程化为线性代数方程组；最后，考虑到节约计算时间，利用对称超松弛预条件共轭梯度迭代算法求解大型线性方程组，得到了各节点的电位值，进而计算出地表的视电阻率。

The kinematic equations of the flow of Newtonian fluid in annulus with the inner cylinder executing a planetary motion were transformed using undetermined coefficient method, and the calculation formula of pressure gradient of the flow was obtained with the given flow rate.

利用待定系数法对牛顿流体在内管做行星运动的环空中流动的运动方程进行了变换，得到了给定流量条件下牛顿流体在内管做行星运动的环空中流动的压力梯度计算公式。

METHODS: Rat double lower limbs were isolated sterilely. Bone marrow was obtained by rinsing using low-glucose DMEM. BMSCs were isolated and purified by the whole bone marrow adherence method and density gradient centrifugation.

无菌条件下分离大鼠双下肢，低糖DMEM培养液冲出骨髓，分别运用全骨髓贴壁法和密度梯度离心法体外分离骨髓间充质干细胞，利用差速贴壁原理对细胞进行纯化扩增。

Single factor method were compared to the concentration of dyes, dye bath pH, temperature, Dyeing time to do a series of gradient experiment, the two groups reached on experiments with suitable for dyeing process conditions,such as the best dye pH, suitable dye concentration, Dyeing appropriate time,temperature values of humic acid and fulvic acid were dyeing wool and silk, and which the general situation has deep understanding.

采用单因素对比法分别对染料的浓度、染液pH值、染色温度、染色时间等做了系列梯度实验，得出了两组上染实验的最佳染液pH值、染料合适浓度、适当染色时间、适宜上染温度等工艺条件值，对腐植酸和黄腐酸分别上染羊毛线及真丝绸的大体情况有了很深的了解。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。