临界值

Flory found for the first time that the zero shear viscosity of thepolymer in melt is proportion to its molecular weight for flexible polymersin 1940. Hereafter Fox and Flory found that the zero shear viscosity isproportion to M〓 when the molecular weight is above the critical value,and is proportion to M when below the critical value.

1940年Flory首先发现对于柔性链聚合物而言，其液态的零切粘度同其分子量成正比；此后， 1948年Fox和Flory发现当聚合物链的长度超过某一临界值时，粘度与分子量的3.4次方成正比，而在临界值之下时粘度与分子量的1次方成正比。

In 1984, Sun Jingxian put forward the conception of invariant set of descending folw in his doctor degree thesis, which gave an another methods to determine a critical value.

这些定理给出了确定临界值的一个基本手段。1984年，孙经先在他的博士论文中提出了下降流不变集的概念，给出了确定临界值的另一手段。

The main results and novelties of the paper are as follows:Firstly, we study the existence of nontrivial solution for the following nonlinear equations with singular pontential By using variational methods and critical point theory, we construct linking type critical value of this kind of singular elliptic equations, with the properties of the eigenvalue, we estimate the critical value and prove the local condition holds to show the existence of the nontrivial solution.

论文的创新点及主要结果如下：首先研究有界区域上具有奇异位势的非线性方程的非平凡解的存在性，运用变分方法与临界点理论，构造这一类奇异椭圆方程的环绕型临界值，并由特征值的性质给出临界值的估计，同时证明局部条件成立，最终证明方程非平凡解的存在性。

We analyze especially the equilibrium rules of optimal strategy and its conditions and make a comparative static analysis to the influence of parameters to optimal thresholds after educing investment value function and optimal investment threshold.

在导出企业投资价值函数和最优投资临界值的基础上，着重分析了企业最优投资策略均衡规则及各均衡存在的条件，并就各参数对企业最优投资临界值的影响进行比较静态分析，得出了一些有意义的结论，同时给出了经济解释。

According to this algorithm, it is shown that the bifurcated periodic solutions through Hopf bifurcations at the first critical value of delay are orbitally asymptotically stable on the center manifold and the bifurcated periodic solutions through Hopf bifurcations at other critical values of delay are unstable.

根据这一算法，发现在时滞的第一个临界值处通过Hopf分支产生的周期解在中心流形上是轨道渐近稳定的，而在其它临界值处通过Hopf分支产生的周期解在中心流形上是不稳定的。

Experimental results indicate that there is a critical value of carbon fiber weight fraction which effects the electrical properties of SCF/NBR.When carbon fiber weight fraction comes to this critical value,volume specific electrical resistance and static ...

通过实验发现，碳纤维的含量对短碳纤维／丁腈橡胶（ShortCarbonFiber／NitrileButadieneRubber）电性能的影响，存在一个临界值，当碳纤维的含量达到此临界值时，SCF／NBR的体积比电阻和静电电压都得到显著的降低。

Horizontal windspeed shear,if bigger than a critical value associated with vertical wavenumber m, factor β, hydrostatic stability N^2 and Richardson number Ri ,leads to instability of equatorial ifiternal inertial gravity wave on the y-z plane,which thus causes zonally syrmnetric disturbances to emergence and development.

只要风的水平切变足够大，大于某一临界值（该临界值与垂直波数m，β因子，静力稳定度N^2以及Richardson数Ri有关），在赤道y-z平面上的重力惯性内波也会发生不稳定，从而引起这种沿x轴对称扰动的激发产生与发展。

The results showed that the critical values of Cd,Pb,and Cu in the Juncus Effuses grown soil were set at 10,100 and 100mg kg-1 respectively,but Juncus Effuses was not able to grow in the Zn polluted soil.

结果表明：种植灯心草土壤中的Cd、Pb、Cu三种重金属临界值可分别设定为10mg kg-1、100 mg kg-1、100mg kg-1。灯心草不适合在Zn污染的土壤中种植，土壤中As临界值尚需作进一步的研究来确定。

Critical levels of external and internal cadinium exposure resulting in impaired uriniferous tubule funcfion of women and its relation to urine cadmium low molecular albuminuria and other biochemical indexes were proposed based of study on health effects of environmental cadmium pollution to residents living in Zhangshi irrigation area in several years.

本文根据张士灌区镉的环境污染对居民健康影响的多年研究，提出了镉的内、外暴露水平和对人群肾小管损伤的＂临界值＂以及镉与尿低分子蛋白等多项生化指标的健康效应关系，并通过超＂临界值＂频率和接触归因危险性评价提出了环境慢性镉危害早期判断标准的初步建议。

When vaccinal ratio is greater than zero, the critical infection value becomes greater with the time increasing.

当接种比例大于零时，传染率需要跨越更大的传染临界值疾病才能流行，且随着时间的增大传染临界值也增大。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷