极值点

This measurement requires the best feature on particular point salient in its nearby points and consistent with its corresponding individual subject points.

学习关键点的好处在于可以实现分阶段层次化的配准，避免配准算法陷入局部极值点。

To draw up the extremum is unexhausted.

关于K值的逼近，怎样才能达到极值点，尚需进一步研究。

According to the analysis of reasons of transformer mal-operation in Pingdingshan Electric Power Bureac for years , and according to the present situation of transformer protection studies and applications at home and abroad. This paper points out the shortcomings of discrimination between internal faults and magnetizing inrush, the problems existing in differentiating the slight faults of turn-to-turn in transformer are also advanced. On the base of the electromagnetic characteristics of transformer, the relations between fluxional differential current and voltage of source side analyzed, all the operating states of transformer simulated by EMTP/ATP, the criterion of magnetizing inrush in transformer is got. Through the wavelet analysis of current waveform, using the intense reaction of wavelet transform to the little change of signal, the internal faults of transformer are distinguished by testing local extremum.

本文根据平顶山市电业局历年来变压器保护误动的原因分析，并根据国内外变压器保护使用和研究的现状，指出了现有变压器保护在区分变压器励磁涌流和内部故障方面以及在判断变压器匝间轻微故障方面存在的问题和不足；从变压器电磁特性出发，分析了电源侧电压和电流微分之间的关系，利用电磁暂态仿真程序对变压器各种运行状态进行了仿真，并以此建立了判断变压器是否含有励磁涌流的判据；通过对电流波形的小波分析，利用小波变换对信号微小变化极强的反映能力，通过检测电流的局部极值点来区分变压器运行状态，并作为上述判据的补充。

Through assuming the same character of continuum and smooth at dimensionless coagulation rate when Péclet number as the independent variable, the analytical results of the three perturbational orders of weak Brownian motion on the strong gravitational motion are gained.

再给以纯Brown碰并率无量纲化的碰并率对于极值点对应的Péclet数有同样连续光滑的性质，求得中Péclet数条件下，重力对流与Brown运动都不能看成小量的耦合碰并条件下，粒子的碰并率；并同时得到高Péclet数条件下碰并率的后三阶解析解。

The simulation results showed that the app roach p resented has better global con2 vergent ability and stability in multi2modal search space, and can avoid p rematurity effectively. So it is a global op2 timization algorithm with good feasibility and high efficiency

结果表明，该算法在多模态搜索空间中具有更好的全局收敛性、稳定性和寻找极值点能力，能够克服早熟现象，是一种有效的全局优化搜索方法

Mathematics A part of a curve that is separated, as by discontinuities or extreme points.

线图表中的一段：由不连续或极值点分隔的曲线的一部分

The proposed algorithm reserves both good fitness particles and the diversity of particles in evolution process,which improves the ability of PSO in getting rid of the local extreme value and meliorates its convergent speed and precision.

该算法在保留高适应度粒子的同时，确保了粒子的多样性，从而改善了粒子群优化算法摆脱局部极值点的能力，提高了算法的收敛速度和精度。

Under the conditions of alcohol amount as 6 .52 times and precipitation time as 59.7 h, the maximal predictive value of polysaccharide extraction horn F. Corni was 35.22 g/100 ml, which was basically in consistent with the measured value of 35.15 g/100 ml.

对回归方程求导可得到极值点，在酒精用量为6.52倍，沉淀时间59.7h的条件下，山茱萸多糖提取最大预测值为35.22g/100ml，实际值为35.17g/100ml，两者基本相符。

Two kinds of representative CC-Repowering (feed water heating repowering,full firing repowering) were analyzed and compared in this paper. Aremarkable phenomenon was observed: Efficiency monotonouslychanges with work-ratio in FF-Repowering system; but in FWH-Repoweringsystem, there exists an optimal ratio at which point the efficiency isthe highest. Another phenomenon to be paid attention is that under somework-ratio, the efficiency of FWH-Repowering is higher than that ofFF-Repowering, giving rise to correcting the conventional concept.

本文对两种典型的联合循环系统(排气助燃型FF-Repowering和给水加热型FWH- Repowering)进行了热力学系统模拟研究，得到了随燃机汽机功比变化排气助燃型系统效率单调变化以及给水加热型系统效率存在极值点的现象，并发现了一定燃机汽机功比下给水加热型效率大于排气助燃型的特殊规律。

Based on the actual conditions of the 5342 fully mechanized caving face of Wulan Coal Mine, the 3-D distribution of gas in the face is tested by measuring points arrangement in the stereo grid. The isograms of gas distribution of the face are drawn. Gas concentration nadir distribution curve along the working face incline direction is drawn by method of seeking function minimum points. The method of calculating gas emission components ratio of the face by means of the curve is brought forward.

针对乌兰煤矿5342综放工作面的实际条件，采用立体网格状的测点布置，对该工作面瓦斯体积分数三维分布进行了测定，绘出了瓦斯分布等值线图，采用求函数极值点的方法，得出了工作面沿倾向瓦斯体积分数最低点分布曲线，提出了基于瓦斯体积分数最低点分布函数的瓦斯涌出分量比例计算方法。

By the time of its fall, most of the prisoners were writers who had written against the corruptions of the government.

到它被攻陷的时候，里面多数的犯人是写了反对政府贪污文章的作家。

The most obvious variation to ovum morphological character was that the color was changed from light green to sepiaceous in embryonic development, and all the ovums were almost hatched after 96h.

在胚胎发育过程中卵的形态特征最明显的变化是颜色从淡绿到深褐色，卵在发育96h后卵基本全部孵化。