极限点

This is an excerpt of a field recording whose input level was much over limit.

这是一段输入音量大大超过极限的田野录音的摘录。2010年2月13日晚上12点左右，除夕夜。

The advantages and limitations of every kind of methods for calculating the failure probability is reviewed. The frist order reliability method, the second order reliability method and many kinds of boundary method have achieved remarkable success and formed nature fields of reliability. However, the precision of these methods decrease as the increase of complexity of problem. The numrical methods are versatile, except numerical intergration is only adaptable to special problems which have small number variables and regular intergral domain. Particularly, the advanced variance reduction techniques own the following character: high precision and a small amount computation. But some questions remain to study in the future because only an initial work about these techniqes is developed.

全面评述了计算失效概率各种方法的优点和局限性，其中经典的解析法包括一次可靠性方法、二次可靠性方法、一阶边界法、Vanmarcke上边界、PENT上边界和Ditlevsen二阶窄边界法，这些方法对于多设计点、变量较多且相关、密度函数不是正态以及极限状态方程较复杂的情况，其计算精度较差；而已有的数值方法却是具有较好的通用性，其中除数值积分法只对变量较少、积分域较规则的特殊问题适用外，各种数值模拟方法均具有较广的适应性，特别是各种改进的方差减小技术，精度高、计算量小，但由于其处在研究的初级阶段，还有许多问题有待于解决。

At the every relative momentary point of time time-space, is to the situation of observe identity mutuality gravitation and space-energy quantum spatial measurement cosmic energy at relatively determine, namely to the difference of quantity quantum of the original spatial measurement and the spatial measurement limit of cosmic energy, to the quantity of quantum spatial measurement cosmic energy, to the situation of spatial measurement and spatial curvature relative time-space cosmic energy, to the difference of spatial measurement of the gravitation exceed the space-energy of quantum spatial measurement cosmic energy, to the situation of the average density spatial energy and the temperature spatial background of relative time-space cosmic energy, to the situation of spatial measurement and spatial curvature relative vacuum cosmic energy all at relatively determine.

在时空时间的每一个相对时刻点，是对宇宙能量的宇称量子的引力与空间能的守恒状况的相对确定。即是对宇宙能量的原初宇称量子与极限宇称量子的数量差，宇宙能量的宇称量子数量，宇宙能量的相对时空的宇称及空间的曲率状况，宇宙能量的宇称量子的引力大于空间能的宇称差，宇宙能量的相对时空空间的能量平均密度及空间的背景温度状况，以及对宇宙能量的相对真空的宇称及空间的曲率状况全都在相对地确定。

It shows that the δ-derivative is identical with the derivative of finite discrete function when the sample points are increased.

引入了连续函数的δ导数新概念，研究表明，在采样点无限增多的情形下，它与有限离散函数导数概念相一致；在极限情形下，它与常规意义下连续函数导数概念相一致。

With the increase of angle of attack, the types and connection models of singular point will be changed.

随着降落伞迎角增大，奇点类型和奇点间的连接方式将发生改变，降落伞物面附近的涡环里将出现极限环，截面流场中将出现新的鞍点和结点。

The stable cutting point can also be accurately recognized on the conditions of different cutting tools.

极限切深试验表明，以稳定切削点所对应的主轴转速进行切削可以提高机床的切削效率。

Individuals at sea are steel blue to blue-green on the back, silver on the sides, and white on the belly, with large oval spots present on the back, the adipose fin, and on both lobes of the caudal fin.

海上的个人是钢蓝色、蓝色的当前背面，脂肪的鳍和对这两种极限的尾的鳍背银的面上的绿色及上大椭圆形点的肚子白色。

The limit of tolerance in column plumbness shall be based on the height from the baseplate to the point being plumbed and shall be measured from the true center line of the column.

栏垂直的公差极限应基于被探测高度的基板点和准确的中线柱的测量。

A characteristic point stiffiness method for tracing limit point of MDOF (Multi-degree-of-freedom) nonlinear structures is proposed in this paper By means of this method, the whole nonlinear elastoplastic path of displacement -load of castellated beams has been successfully traced It gives an insight into the failure state of castellated baem

根据跟踪结构极限荷载的特征点刚度方法，首次对自由度数非常大的蜂窝梁进行了非线性荷载位移全过程分析，揭示了蜂窝梁的受力特性，从而对蜂窝梁的非线性工作状态有了较为全面的了解。

In order to ensure that the structure is stable, the working stresses are kept well below the yield point or the proof stress.

为了保证结构稳定，工作应力应很好地保持在屈服点或弹性极限以下。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。