查询词典 directional

However, to establish global convergence for these latter methods, one must enforce either sufficient decrease conditions (the Armijo-Goldstein-Wolfe conditions)or a fraction of Cauchy decrease condition - all of which rely on explicit numerical function values, as well as explicit approximations to the directional derivative at the current iterate.

但是，为了保证后面方法的全局收敛，必须有足够的减少条件（Armijo-Goldstein-Wolfe条件）或者部分柯西减少条件——它们全都依赖于外在的数值函数值，就和在当前迭代逼近方向导数一样。

Based on the simulated data produced by PROSAIL model and field test data, the authors respectively analyzed many kinds of factors which affect some representative inversion method s, such as VI, second derivative, model inversion and the directional second derivative.

以PROSAIL模型模拟数据和地面实测数据为基础，分别分析了土壤背景、冠层反射率非各向同性以及随机噪声等因素对几类代表性反演方法的影响(植被指数法、二阶微分法、模型反演法以及方向性二阶微分法)。

By Minimum Directional Derivative analyzing,it was also found that the FTEs were of the quasi-2D structure,the direction of the current was almost parallel to the plasma flows and the axis of the flux tubes.

应用最小方向微分法，发现这些FTE事件具有准二维结构，即为圆柱形结构，其通量管轴线方向与管内电流方向及粒子运动方向基本平行。关键词：电流密度；磁通量管；磁层顶

Using the directional derivative formula, the governing equation is discreted in the physical domain in which a nonorthogonal grid system is used. Two kinds of AF2 schemes, i. e. AF2-plane relaxation and full implicit AF2, for the TSD equation are proposed. Numerical results show that the full implicit AF2 scheme converges faster than AF2plane relaxation scheme. For the rectangular wing and swept wing, the results of the present method are compared with FP results, and the agreement is good.

采用适合于梯形机翼和后掠机翼的斜网格，利用方向导数公式直接在物理空间对主管方程进行离散；将近似因式分解方法应用于绕机翼的跨音速小扰动势流问题，提出AF2—面松弛和AF2全隐式两种迭代格式，并对它们的收敛速度进行比较，结果表明后者明显快于前者；直机翼和后掠机翼的算例表明，本文方法的结果与精确势流方法的结果吻合良好。

A algorithm of dim small targets detection in infrared image is proposed. Image is processed by using median filter and unsharp mask. The infrared image intensity surface is fitted by Haralickd discrete orthogonal polynomial basis function,and then the maximum points are detected on the fitted intensity surface by convolving the image with the second order directional derivative operators.

提出一种红外弱小多目标图像检测方法，图像先经过中值滤波、高提升滤波增强处理，再用基于Haralick离散正交多项式曲面拟合图像，拟合曲面的极大值点即目标点，可以利用导出的二阶方向导数算子与图像进行卷积得到。

This study was aimed to investigate the effect of exogenous Wnt5a on directional differentiation of K562 cells.

本研究探讨外源性Wnt5a诱导K562细胞定向分化的作用。

OBJECTIVE: To investigate the in vitro directional differentiation of BMSCs into chondrocytes, and identify the differentiated cells.

目的：观察体外诱导骨髓间充质干细胞向软骨细胞的定向分化，并对分化后细胞进行鉴定。

However, detailed differentiation properties and the directional differentiation system of iPS cells have not been demonstrated.

但是这种细胞的具体分化特性以及定向分化体系还没有得到明确证实。

BACKGROUND: Bone marrow mesenchymal stem cells are capable of multiple directional differentiation, and are potential cells and target cells for gene therapy.

背景：骨髓间充质干细胞具有多向分化能力，是目前极具潜力的细胞及基因治疗的靶细胞。

In the differentiation step,directional derivatives in only two directions are necessary,when DD operators are used.

在分化阶段，只有两种情况需要用到方向导数。一种是使用DD设备是。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。