下降函数

Occurrence and development of winter-time natural convection cooling effect in the fractured-rock embankment of Qinghai-Tibet highway were investigated using the governing equations based on air-flow function for natural convection in porous media with variable permeability.

通过变渗透率多孔介质流函数控制方程，分析了青藏公路碎石路堤冬季自然对流降温效应的发生和演化过程。结果表明：公路碎石路堤冬季自然对流降温效应从边坡区域最先开始形成，并随着冬季路面温度下降而逐渐向路堤中间区域发展。

In this chapter, we compare the two different points of the quality economic benefits. We not only establish the econometric model from the traditional viewpoint, but also deduce the econometric model to evaluate the economic benefits of Six Sigma base on the Quality Engineering and Loss Function of Taguchi. Our research has proved that the excess cost decreased quadratically by the increasing of the sigma level.

比较了两种不同的质量经济效益观，不仅建立基于传统观的经济效益计量模型，笔者还基于田口玄一博土的质量工程学和质量损失函数建立六西格玛管理经济效益的计量模型，验证了六西格玛管理的观点，即随着西格玛水平的提高，企业的额外成本呈曲线下降的趋势。

The coupling architecture of double wave-front correctors can be constructed by simultaneously controlling the approximated wave-front corrector and the original one with SPGD technique for a common performance metric.

该校正器与原校正器同步工作，并采用随机并行梯度下降算法对同一个性能评价函数进行优化，从而构成了双校正器的耦合工作结构。

In allusion to the above-mentioned problems, considering the self-adaptive regulative ability of the visual system to natural perceptive information and the feedback between visual cortexes, a bidirectional NNSC model is proposed, which is based on the robust principal component analysis and the priors of receptive fields of simple cells in V1. And using the (Polak-Ribiere-Polyak) PRP conjugate gradient descent algorithm, the minimum optimization problem of the objective function can be realized.

针对上述问题，考虑视觉系统对外界感知信息的自适应调整机制和视皮层之间的反馈连接，本文提出了一种基于稳健 PCA 和 V1区简单细胞感受野先验知识的反馈非负稀疏编码模型，并且使用 Polak-Ribiere-Polyak共轭梯度下降优化算法实现了目标函数的最小化问题。

The excess nitrogen atoms in WNx films desorbs at temperatures below 766 ?aC. The excess nitrogen in WNx films can cause the effective work function lowering. Weak Fermi-level pinning effect is observed on HfO2 film. In this case, WNx/HfO2 gate stack can be applied to p-type fully-depletion SOI devices but WNx is not suitable to be meal gate of bulk p-type MOSFTEs.

氮化钨中过多的氮元素在温度低於766 oC便会析出，且过多的氮会导致氮化钨有效功函数下降，在氧化铪上会有轻微的费米栓效应，这种情形下，氮化钨可应用於p-型全空乏绝缘层上矽金氧半场效电晶体元件，但不适合当块材 p-型金氧半场效电晶体闸极。

In the traditional neural networks based on gradient decline, nonlinear object functions with multiple extrema are easy to get stuck in the problem of local optimization solution. Therefore, a new method of chaos optimization neural network with weight learning is introduced in this paper.

针对传统的基于梯度下降法BP神经网络中存在非线性多极值目标函数易陷于局部最优解的问题，提出了一种权值学习混沌优化的神经网络方法。

Moreover, the solution of the QP problem provides a descent direction for most merit functions.

另一方面，此时QP子问题的解是许多效益函数的下降方向。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。