物理过程

As an often used physical model with good theoretical and practical values, StreeterPhelps model has been widely used to study water quality. However, in some special water areas the utilitization of StreeterPhelps model has some limitation as confirming reaeration coefficient often comes from tests in rivers with fast water flow speed with no consideration of wave effects. Furthermore, in practical research in Three Gorges Reservoir, the changing rule of COD appears abnormally. In some water areas far from pollution source, the value of COD changes with time, but does not follow the exponential attenuation rule. This phenomenon can not be explained by former modified StreeterPhelps model.

StreeterPhelps模型是目前进行河流水质研究常用的物理模型，具有良好的理论和实用价值，然而在某些特定水域，该模型的应用受到限制，主要原因是复氧系数的取定多在水流速度较大情况下得到的，而未考虑水面波动对复氧系数的影响，另外，在实际研究过程中发现三峡库区COD变化的规律出现异常：在离排污口相当远的水域，COD随时间变化趋势并不是指数衰减，而是在某个常值附近微小摆动，以往很多修正过的StreeterPhelps模型都无法解释这个现象。

However, in some special water areas the utilitization of StreeterPhelps model has some limitation as confirming reaeration coefficient often comes from tests in rivers with fast water flow speed with no consideration of wave effects. Furthermore, in practical research in Three Gorges Reservoir, the changing rule of COD appears abnormally. In some water areas far from pollution source, the value of COD changes with time, but does not follow the exponential attenuation rule. This phenomenon can not be explained by former modified StreeterPhelps model.

StreeterPhelps模型是目前进行河流水质研究常用的物理模型，具有良好的理论和实用价值，然而在某些特定水域，该模型的应用受到限制，主要原因是复氧系数的取定多在水流速度较大情况下得到的，而未考虑水面波动对复氧系数的影响，另外，在实际研究过程中发现三峡库区COD变化的规律出现异常：在离排污口相当远的水域，COD随时间变化趋势并不是指数衰减，而是在某个常值附近微小摆动，以往很多修正过的StreeterPhelps模型都无法解释这个现象。

So this paper aims to solve the problem with modeling,controlling, rendering and details by seeking for a tradeoff between the realistic and real-time, and to build a realistic and real-time water animation system with various wave effects.

传统的基于过程的方法难以胜任高真实感需求的水波动画模拟，比较而言，基于物理的方法，从运动的本质上研究水波的产生机理，能够产生比较好的模拟效果。

Thus chaos theory is, very generally, the study of forever changing complex systems based on mathematical concepts of recursion, whether in the form of a recursive process or a set of differential equations modeling a physical system.

通常混沌理论是研究建立在数学递归概念基础的上永远改变复杂系统，无论以回归过程形式或建立微分方程物理系统模型。

We simulate the pore water flow and the associated solute transport in a salt marsh based on an imaginary creek section.

基于假定的潮沟横断面物理条件，对孔隙水流动及溶质运移过程进行了模拟分析。

By means of schlieren method, experiments and analogdata technique, the phenomena and data in the process of PSFP are comprehensively observed, recorded, and analyzed. The dynamics and thermophysics characteristics of plasma jet and the powder in it are revealed. Also the impact of characteristics mentioned above on the precision, property and microscopic structure are studied.

结合纹影成像等测试方法，本文通过实验与数值模拟技术，全面考察、记录和分析等离子熔射成形过程的现象与数据，揭示等离子射流及射流中粉粒的动力学和热物理特性，并研究了上述特性对熔射成形零件精度、性能及微观结构的影响规律。

In this paper, we mainly study the controllability for semilinear parabolic equations with various controls.

抛物型方程是自然界热传导过程的数学模型，因而是数学物理中一类重要的方程。

Application and development of platelet transpiration cooling technology in LRE;2. The Computation and Analysis of Heat Transfer of Platelet Cooled Microchannel on the High Temperature and High Pressure Gas Wall;3. Physical-mathematic model is built for the process of evaporation and combustion of the two interactive arbitrary size semisphere pearly transpiration droplets in platelet hole structure under micro-gravity condition.

针对微重力条件下层板孔隙结构中两个相邻任意尺寸半球形珠状发汗的蒸发与燃烧过程，建立了相应的数学物理模型；在双球坐标系中求解分子扩散传质偏微分方程，得到发汗液珠的分子扩散组分分布的解析解和扩散速率表达式；分析得到在常温、高温条件下蒸发以及燃烧状态下发汗液珠的相互作用因子式，计算了相互作用的发汗液珠在不同条件下的发汗蒸发量以及变化趋势。

If you are not appreciating the contrast of your time and place, if you are still sifting through the stuff and saying,"These things I want and these things I don't want and these things I would like to come to me and those things I would like to go away from me," you are like most physical humans in your approach.

如果你不欣赏的对比度，你的时间和地点，如果你还在漫长过程中的东西，并说，"这些事情我想这些事情，我不想和这些事情我想来找我和这些东西我想远离我，"你最喜欢的物理，人类在你的做法。

In this article, 3-D Ising model is simulated by the means of Monte Carlo, such as the simple cubic lattice, the body-centered cubic lattice and the face-centered cubic lattice.

它是一种计算机模拟的方法，采用随机抽样，能够比较逼真地描述真实物理实验过程，精确性好。

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。