松弛时间

The authors investigated the singular limits of stiff relaxation and dominant diffusion for general 2×2nonlinear systems of balance laws, that is,τ=o,ε→ 0, the relaxation time τtends to zero faster than the diffusion parameter ε. If there exists a priori L∞ bound that is uniformly with respect to ε for the solutionsof a system, then the solution sequence converges to the corresponding equilibrium solution of the system.

研究一般扩散占优的2×2双曲平衡律系统奇异松弛极限，用补偿紧性方法，在松弛时间τ比扩散系数ε趋于零快时，即τ=o，ε→ 0时，得到其解的整体存在性一般框架：如果上述系统的解存在对ε一致的先验L∞估计，则其解序列收敛于上述系统的对应平衡状态解。

Then analytic expression of continuous relaxation time spectrum is obtained by correlative calculation method.

松弛时间谱是粘弹性函数的核心，获得连续松弛时间谱一直是难点问题。

The results indicate that the dynamic shear rheological test helps to obtain the continuous relaxation time spectrum suitable for the research on the pavement performance of asphalt mixture.

结果表明，动态剪切流变试验能够有效获得连续松弛时间谱，连续松弛时间谱能够为沥青混合料的工程性能研究提供有利手段。

The relaxation time is the important factor to affect the extensional viscosity, and the effect is different in the different area.

另外，松弛时间是影响无量纲化拉伸粘度的重要参数，并且在不同的范围内，影响不同。

Parameter τ＇(ratio of lag time of diffusion process to relaxation time of polymer) can define the form of the differential equation: hyperbolic or parabolic.

参数τ＇（扩散的瞬态过程引起的滞后时间与松弛时间之比）的存在与否决定了方程是双曲型还是抛物型。

The results shows that die pressure of extruder, relaxation time of polymer and geometrical parameters of die have significant effect on stress tensor in extruder die. By changing the geometrical parameters in the flowing channel, the pressure can be controlled.

模拟结果表明：机头压力、材料的松弛时间以及口模流道的几何尺寸对高聚物在机头中的应力张量的变化影响较大；通过改变挤出流道的几何尺寸，完全可以控制高聚物的熔体压力。

We found that DNA condensation process is slower in strong confinement than in free solution in de Gennes regime.

我们认为增加的部分是来自於在de Gennes regime中松弛时间的增加导致凝缩需要较长的时间。

In this paper, the stress-relaxation bahivior of pig shoe upper leather was studied by generalized Maxwell models.

本文首先以猪皮鞋面革为研究对象，研究了广义Maxwell模型对皮革应力松弛行为的适用性，并利用广义Maxwell模型研究了其离散应力松弛时间谱的形式。

Based on heat relax time and mass relax time, coupled effects between temperature, humidity and vapor pressure are analyzed.

本文在考虑多孔介质热松弛时间和质松弛时间的基础上，分析了温度、湿度和蒸汽压力间的相互耦合作用。

Through the analysis of De, an alternative mechanism interpreting of the"overshoot"phenomena can be obtained: when the diffusing time of small molecular penetrants is shorter than relaxation time of the involved polymer, small molecular substance penetrates into the polymer quickly and its concentration reached a maximum, then the swelling of the polymer by the small molecules makes the chain structure of the polymer relaxed, thus the free volume in polymer matrix, which is occupied by small molecule, decreased, and will squeeze part of the small molecular substance out of the polymer, and therefore overshoot behavior can be observed.

通过对De的分析，可以得出产生&超调&现象的机理的另一种解释：小分子渗透物质的扩散时间相对于聚合物的松弛时间要短（相当于有个更快的扩散速度），所以小分子迅速扩散进聚合物中达到一个极值，由于小分子物质对聚合物的溶胀，使得聚合物链结构产生松弛，由于聚合物链结构的变化，小分子物质占有的自由体积会减小，这样会挤出小分子物质，使得小分子物质在聚合物中的浓度减小，如果高聚物粘弹性明显，甚至可能出现多个浓度的衰减振荡并达到平衡值。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了