查询词典 wave down

The wave front of an optical system is one of important parameters for evaluating imaging quality.

光学系统波像差是表征光学系统成像质量的重要指标之一。

With the development of integrated optics, all kinds of optical wave-guide devices with different function have appeared.

随着集成光学的发展，出现了越来越多的结构不同、功能各异的光波导器件。

The optimal output power of ultrasonic wave was 80 W and the temperature was 50℃.

制备过程中，超声波的引人能够提高活性组分的分散性，改善活性组分的粒径，催化剂的催化加氢性能得到明显改善，超声波辅助金属诱导化学镀Ni-B/MgO催化剂的最佳输出功率为80W，制备温度为50℃。

In order to know interval velocity in layered acoustic medium,re- locity analysis is made using wave field continuation and fuzzy decision theories.

为了获得层状声学介质的层速度参数，文中依据波场延拓理论和模糊决策理论改进了速度分析。

Paraxial approximation absorption boundary condition based on acoustic wave equation can obtain better absorption results by increasing paraxial approximation order of Taylor series. However, this kind of operation will increase the complexity of difference computation, and result in instability of computation process.

基于声波波动方程的旁轴近似吸收边界条件可以通过提高泰勒级数展开的旁轴近似阶数获得更好的吸收效果，但这样不仅增加了差分计算的复杂性，同时还导致计算过程不稳定。

Based on this, a new WENO difference scheme which based on Dispersion-Relation-Preserving relation is developed, and representative test cases with this scheme for computational aeroacoustics problems has been implemented and compared in order to test capability of wave capturing; In addition, WENO schemes generally do not converge at high order in the presence of contact discontinuity of Euler equations, so a conservative front tracking technique coupling WENO schemes and Level Set method to simulate the translating density profile is presented here, and numerical simulation with this technique for representative test case has been implemented and results show the desired accuracy.

本文研究了高阶精度加权基本无振荡格式及其在双曲守恒律方程中的应用，在此基础上作了两个方面的工作：一是针对高频声波问题构造出一种基于保色散关系的WENO有限差分格式，并对计算气动声学问题的代表性算例进行了大量数值实验，比较了该格式捕捉波数的能力；另外，针对高阶WENO格式在处理Euler方程的接触间断时精度有所降低的问题，研究了利用界面追踪技术Level Set方法和高阶激波捕捉WENO格式相结合的一种守恒追踪方法，并且给出有代表性的密度滑移面问题的算例，得到一致高阶精度的数值模拟结果。

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永平家电有限公司位于世界小商品之都-浙江义乌，公司本着"以质量求生存，以信誉求顾客，以创新求发展"的宗旨，经过多年的努力，现代理全国各种品牌电熨斗、电吹风、蒸汽刷、烫发器、等为代表的上百个种类的产品，还可欢迎来样定货，我们的产品直接销往南韩、日本、俄罗斯、香港、中东等国内外几十个国家，树立了良好的市场形象，建立了良好的品牌信誉。

Main business sale: This company proxy nation each kind of brand electric iron, the electric drier, the steam brush, have a permanent wave, welcome incoming sample ordered merchandise.

主营销售：本公司代理全国各种品牌电熨斗、电吹风、蒸汽刷、烫发器、欢迎来样定货。

The ray that corresponds to wave surfaces tangent to the spherical wavelets is undeviated and is called the ordinary ray.

球形次级波面的切线相应方向的光称为寻常光。

An intrinsic symmetry property of subatomic particles that is characterized by the behavior of the wave function of such particles under reflection through the origin of spatial coordinates.

本质均衡性亚原子粒子的本质平衡性，以其波函数在通过空间坐标原点的反射下的移动状况为特征

A carrier gas such as nitrogen is directed through line 20 and valve 22 to connect with line 26 and mix with the gas sample.

如氮气之类的载体通过管线20和阀22引入，与管线26相通，与气体样品混合。

But for the most part, knaves and parasites had the command of his fortune

然而支配他的家产的大多是恶棍和寄生虫。