随着二叠纪生命形式的衰退，它们达到了一个致命的临界点，物种最终走向了大灭绝。
As Permian life-forms declined, they reached a fatal threshold and species succumbed to mass extinction.
运用特征值分析与响应分析结合的方法，研究了系统失稳的临界流速与失稳形式。
The critical velocity and form of instability are studied by the means of eigenvalue and response analysis.
提出了一种在注入功率空间中求取电力系统实用动态安全域(PDSR)的超平面形式的临界稳定边界的新方法。
An effective method is proposed for obtaining the critical boundaries of hyper plan (HP) form of practical dynamic security regions (PDSR) of power systems in power injection space.
给出了周向初应力数值特征对端部受推力竖直向上加速圆柱壳弹性屈曲形式和临界力的影响。
The inflectional form and the critical value's effect imposed by circumferential initial stress character on cylindrical thin shell beard the thrust at axis, accelerating upwards erect.
提出了新的变截面梁临界弯矩计算式，其表达形式与等截面梁的公式相同，便于工程应用。
A new critical moment formula of tapered beam is proposed, which is similar to the expression for beams with uniform cross-section.
分析测得的试验结果，对底部和侧部两种进水口提供不同的系数，有利于针对实际工程中进水口的具体形式，作为估算临界淹没水深的参考。
Analyzing the experimental data measured, different coefficient is provided relating to the bottom and side intakes, which can be the reference of specific form intakes in reality project.
该方法考虑土的应力应变关系和土坡失稳的破坏形式，从分析土坡应力分布的变化入手，直接确定临界滑裂面的位置，进而计算土坡总体安全系。
Beginning at the analysis of variation of stress distribution of a slop, the location of critical slip surface is directly determined, and the globe safety factor is calculated.
对于在受压边简支，纵向加筋的受压加筋板，本文给出了求解临界载荷的特征方程的精确形式。
The exact characteristic equations for solving the critical bucking load of stiffened plate compressed and simply supported in direction of the stiffeners are derived in this paper.
在超临界转速区，系统响应以混沌、周期分频和拟周期为主要运动形式。
But the main responses are chaotic, periodical and quasi-periodical motions in supercritical speed range.
超导临界温度级数公式的闭合形式，蔡建华，科学通报，25 (1980)727。
A Closed Form for the Series Formula of the Superconducting Critical Temperature, Tsai Chien-hua, Kexue Tongbao 25 (1980) 727.
对钢丝缠绕增强塑料复合管应变、剥离强度、临界失稳压力、不同温度下的失效形式等进行了试验研究。
Strain, peel strength, critical buckling pressure and failure mode under various temperatures of PSP were investigated using experiments.
提出了填充系数理论，制订了土体渗透破坏形式的填充系数判别式和管涌临界破坏坡降计算图。
The filling coefficient theory was put forward, a criterion for the filling coefficient of soil stratum failure and a critical hydraulic gradient chart were formulated.
计算的结果表明：该算法找到全局最优解，并且真实再现某些情况下，圆形或其他非圆形式的临界滑动面。
The test results demonstrate that this algorithm can pick out the global critical slip surface, and the circular or non-circular critical slip surface is reproduced as well.
在压力和温度大于其临界点时，二氧化碳只可能以超临界流体形式存在。
At pressures and temperatures greater than the critical point, carbon dioxide exists only as a supercritical fluid.
本文主要利用拓扑度理论中的不动点定理和变分方法中的极小作用原理及其环绕形式的临界点定理在适当的条件下讨论了一类二阶椭圆边值问题的可解性。
The aim of this thesis is to study the existence of weak solutions for semilinear second order elliptic boundary value problems under suitable conditions through topological and variational methods.
然后综合考虑了水蒸气状态方程、表面张力计算方法和水的密度计算方法对计算临界液滴半径的影响，进而得出了计算过饱和状态下临界液滴半径的具体形式。
In addition, on the basis of available experimental data a formula for the exact prediction of liquid droplet surface tension was obtained by using a fitting process.
其表现形式为纯正数，以100作为景气指数的临界值，其数值范围在0 - 200之间。
It is expressed by a pure positive number between 0 and 200 with 100 as the boundary value of climate index.
结果表明，准直线函数计算公式在工程常用范围内，计算临界水深的最大相对误差小于0.6%，准直线函数计算公式形式更为简单、精度较高、适用范围广。
The results showed that the maximum error was less than 0.6%, indicating that the direct formulas of the quasi-linear function were much simpler, precise and wider than previous ones in applications.
结果表明，准直线函数计算公式在工程常用范围内，计算临界水深的最大相对误差小于0.6%，准直线函数计算公式形式更为简单、精度较高、适用范围广。
The results showed that the maximum error was less than 0.6%, indicating that the direct formulas of the quasi-linear function were much simpler, precise and wider than previous ones in applications.
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