临界

In addition, the blank holding force that is required to avoid wrinkle and rupture during conical part deep drawing is researched. The necessity of reasonable blank holding force in pressing is expounded. From the view of mechanical analysis, the wrinkle critical condition of side-wall is derived for the first time by the stress state of side-wall, the main deformation region on blank. According to the critical condition of plastic instability for flange, side--wall, corner of punch on blank, The blank holding force in conical part deep drawing is divided into four different regions within its forming figure. The basic principle of reasonable blank holding force during stamping is summarized and provided. The mathematical model of reasonable blank holding force that avoids the wrinkle and rupture is established and verified by the finite element numerical simulation and the grid experiment method. The result shows that it is accurate and reliable.

此外，本文还研究了圆锥形件拉深成形过程中，随着拉深变形过程的进行，毛坯为避免产生起皱、破坏缺陷而对压边力的需求情况，阐明了圆锥形件拉深成形过程中压边力合理变化的必要性；由毛坯主要变形区悬空锥壁部分的受力变形情况，从力学分析的角度，首次推导得出了圆锥形零件悬空锥壁起皱失稳的临界条件；并根据主要变形区法兰、悬空锥壁及凸模圆角部分的塑性失稳临界条件，在其成形范围图中，将圆锥形件成形过程中的压边力划分为四个区域；总结并提出了圆锥形件成形过程中压边力合理变化的基本原则；建立了防止起皱、破坏缺陷产生的压边力合理变化的数学模式，并得到了有限元数值模拟及网格实验法的验证，证实了理论分析结果的正确性和可靠性。

OP0 method can only be used in subcritical cycle and not suit for transcritical cycle.

OP0法的计算方法只适用于亚临界循环，不适用于跨临界循环。

According to the method, the effect functions of imperfections about buckling loads of the composite sheet—space lattice shell and she single layer lattice shell are obtained. These effect functions can be simply used to determine the nonlinear buckling loads of engineering structures with imperfections.

并运用该方法，分别计算编制了板片空间结构和普通单层网壳的缺陷对临界荷载的影响函数图表，根据图表中均值和方差函数以及缺陷敏感性指标，在设计该类结构时可以较简便地确定缺陷对临界荷载的影响。

The combustion of emulsion explosive matrix is nearly relational with the temperature of the environment, the delayed-action time will extend when the non-adiabatic semenov parameter is around the critical value.

其燃烧与环境温度有着密切的关系，当非绝热semenov数处于亚临界和临界值时，爆炸延滞期延长。

A safe region,which is defined according the critical hydrate volume concentrations,is firstly proposed for hydrate slurry,and it can be used to judge if the pipeline can be run safely or not.

通过与其他研究的比较，以临界水合物体积浓度为判断标准定义了一个流动安全区，当管道中的水合物体积浓度小于临界值，可以认为是安全的，相反则认为管道存在水合物堵塞的威胁。

Especially,in setting of the right turn lane,this paper establishes the critical volume models of setting the right turn vehicle phase and the pedestrians phase in separately,and effective proposes the method of calculating the critical value.

尤其是针对设置了右转专用车道情况下，通过设计右转车辆与行人相位分开设置情况下的流量临界模型，提出了设置二者的相位分开设置的临界值的计算方法。

Based on the amendment to the classical theory of labor value, this article primarily studies the cost recovery principle in the determination of knowledge value and price, clarifies the critical price level and critical transaction volume of knowledge in the fractal reproduction of knowledge, and finally points out the applicability of labor cost st...

本文从修正古典劳动价值论出发，主要探讨了知识价值和价格决定中的成本补偿原理，阐明了在知识分形再生产条件下围绕成本结构变化的知识临界价格水平与临界交易量，并对劳动成本观点的适用性进行了初步分析。

The formula of the critical pressure ratio for safety valve is proposed.

提出了一种由喷管临界压力比确定安全阀临界压力比的计算公式。

The empirical results show that, one should choose BCV rather than ACV when the sample is less than 200, or the autoregression coefficient closes to unit root, or the linearity test is ARCHT or BDS.

通过实证与对比分析，结果表明，当样本小于200或自回归系数接近单位根，或者线性性检验是ARCHT或BDS时，就可以考虑应用自举法临界值而非渐近临界值。

An everyday example of Ostwald ripening is the recrystallization of water within ice cream which gives old ice cream a gritty, crunchy texture.

Ostwald发生的过程包括小于一个临界尺寸的粒子的溶解，然后质量转移到大于这个临界尺寸的粒子上。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。