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In this paper is simulated numerically to flow of incompressible fluid entering into porous medium region from free space region in a 300mm diameter paper filter of the air filter.

对滤芯直径为300mm的空气滤清器内空气从自由空间区域进入多孔介质区域的流动进行了数值模拟。

Optimal algorithm of combined nonlinear Hopfield network appears powerful validity in solving nonlinear planning, which includes nonlinear objective function, linear constrains and high-demension of decision-making variants, for its ability of nonlinear parallel computation. It is prominent among optimal algorithms because of its function of simply implement with electrocircuit hardware. Genetic algorithm is expressly suitable for optimal calculation regarding the planning of massive, highly nonlinear, inconsecutively differentiable and multiobjective function as well as objective function without analytical expression. However, it inclines to prematurity, as well as its limitation in ability of partial optimal search. Introducing the optimal algorithm of niche genetic simulated annealing to standard Genetic algorithm, can therefore improve the full-scale or partial search ability of Genetic algorithm effectively. It has a far-flung perspective in the field of systemic planning of water pollution control.

组合式非线性Hopfield网络优化算法所具有的非线性大规模并行计算能力在求解具有非线性目标函数、线性约束条件及高维决策变量的非线性规划问题方面显示出了强大的生命力，它易于电路硬件实现的功能更是在优化算法中独树一帜；遗传算法采用概率搜索技术，不受目标函数与约束条件的限制，特别适合大规模、高度非线性的不连续可微的多峰目标函数及无解析表达式的目标函数的规划问题的优化计算，但其存在容易早熟、局部寻优能力较差等缺点，本文在标准遗传算法中引入小生境技术及模拟退火算法有效地改善遗传算法的全局和局部搜索性能，提高了全局最优解的寻优质量，小生境遗传退火模拟优化算法在水污染控制系统规划中的应用前景极为广阔。

To resist multipath and ISI in acoustical communication, a single filter receiving method and a new method, namely preprocessing frequency hopping filtering method, were adopted simultaneously. A controlled preprocessing frequency hopping filter was added before mixing frequencies of signal receiving system to strengthen resistance against multipath and ISI. The method was simulated respectively on two frequency hopping sequences of PN code and increasing sequence.

除了采用以往的单一滤波接收处理方法，本文还采用了一种新的接收处理方法，即前置跳频滤波接收处理方法，与其他方法不同的是在信号接收系统的混频之前增加了可控的前置跳频滤波器，可以增强抗多途和码间串扰能力，并对此方法分别采用PN码和递增序列2种跳频序列进行仿真研究。

Finite element method was used to explore the nanoindentation process of several materials under Berkovich indenter. The simulated nanoindentation results with different tip radii were compared with experiments.

采用有限元方法模拟了纳米压痕中不同曲率半径针尖的压头压入不同材料的加、卸载过程，并对计算结果与实验进行了对比以验证模拟的可靠性。

It was confirmed by TTC histochemistry, India ink solution perfused through the left ventricle of heart, BBB permeability examination and neurological status grading that this model was very well simulated the pathological process of cerebral ischemia-reperfusion.

经TTC染色、印度墨水灌流、血脑屏障损伤及神经症状的观察证实该模型能较好地模拟脑缺血再灌注的病理发展过程。

However, the Lateral Shear Interferometer can realize the two kinds of measurement, and it is the better tool for aero-optical test. For ordered aberration, it is deduced and simulated that the ability of wavefront reconstruction of LSI is better than Hartmann Wavefront Sensor , for the indirect sampling information of wavefront with LSI is more than HWS.

进一步分析了随机扰动和有序扰动的测量方法，指出在两种扰动同时存在的条件下，横向剪切干涉仪可以同时对两种扰动进行测量，因而是近场测量气动非均匀介质对光束质量影响的较好的研究方法。

Using this simulated inductor, high pass filter is constructed with good performance. Thus, it ...

用此模拟电感制成的高通滤波器，性能良好，可以在工程中应用。

Using this simulated inductor, high pass filter is constructed with good performance. Thus, it is pro...

用此模拟电感制成的高通滤波器，性能良好，可以在工程中应用。

The filling process was simulated to analyze local overheat in die resulting from irrational filling and cold shut occurred in far-end in aluminum alloy engine bracket.The results indicate that the defects are caused by irrational ingate design.

针对铝合金摩托车发动机支架在压铸生产中充型不合理导致模具局部温度过热以及铸件充型远端容易出现冷隔缺陷等问题，运用数值模拟方法对压铸工艺过程进行分析，发现内浇道结构不合理是导致以上问题的主要原因。

According to the real situation of gas-field exploitation, the hydrate generating system is simulated by the actual conditions as much as possible. Taking some gas field as example, with JEFRI sapphire hydrate device, the liquid systems of gas hydrate generating with frothing agent, electrolyte and condensate oil are studied by experiments and compared with the pure water system. The variation of critical conditions to form gas hydrate and its influence on the effects of inhibiter are discussed for the 3 hydrate systems, which provides the basis to prevent hydrate generation in the fields.

针对气田生产的实际情况，文章尽可能接近现场水合物生成体系，以某气田为例，利用JEFRI蓝宝石水合物装置，通过实验分别研究了含泡排剂、含电解质和含凝析油的天然气水合物生成液体体系，并与纯水体系进行对比，探讨了在这3个体系中天然气水合物形成的临界条件的变化以及对抑制剂抑制效果的影响，从而为水合物的现场防治提供了依据。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。