查询词典 propagation

Based on basic theory of elastic wave propagation, wave equation forpropagation of elastic wave in 2 dimension vertical inhomogeneous mediumof similar concrete cutoff wall model is developed. 2 dimension elastic sheetof concrete cutoff wall is established to research law and energy distributionrelations between propagation, attenuation, reflection and transmission ofelastic wave in concrete cutoff wall; Based on the concept of resolution, thecontent of vertical reflection method used to inspect concrete cutoff wallresolution is raised and factors will have influences on resolution are analyzed,expression of defective layer composite reflection factor and detectabledefective layer maximum thickness are developed; Relations between allsteps of sampling system of vertical reflection are build, the influence ofcentrum characteristics and receiving sensor on testing results are analyzed,therefore parameter requirements for testing instrument and parameter selection principle of collected parameters are raised.

2从弹性波传播的基本理论研究出发，推导了弹性波在类似混凝土防渗墙模型的二维垂向不均匀介质中传播的波动方程式；建立了混凝土防渗墙二维弹性薄板模型，研究弹性波在混凝土防渗墙中的传播、衰减、反射、透射规律及能量分配关系；从分辨率的概念出发，提出了垂直反射法检测混凝土防渗墙分辨率的内涵，对影响分辨率的因素进行了分析，推导出了缺陷层复合反射系数、可检测缺陷层极限厚度的表达式；建立了垂直反射法采样系统各环节之间的关系，研究分析了震源特性、接收传感器对测试结果的影响，提出了对测试仪器参数的要求及采集参数的选择原则。

In order to record the historical process of technology propagation in honeysuckle production, the author investigates in detail technology propagation and application during the process of producing and selling honeysuckles in the Bunu-Yaos'community, and analyses the effect of technology change on culture change, which the introducing of crop honeysuckle production has led to. And submit views and suggestions specifically for the existed problems. Sum up the shared changing rules of crops, technology and culture.

以记录金银花生产技术传播的历史为脉络，对布努瑶地区金银花生产、销售过程中技术的传播与应用状况进行详细调查，分析了作物金银花引进生产这一技术变迁对布努瑶文化变迁的影响，并针对其中所存在的问题提出自己的看法和建议，总结作物、技术与文化共变的规律。

In the first part of the paper, it discusses the publishing and utilization condition of the on-line scientific documents in China. In the second part, it analyzes the obstacles existed in the essential elements of the propagation system and the inabilities of the propagation system itself and the social environment.

首先介绍我国网络科技文献的出版及利用情况，然后从科技文献网络传播的基本要素、网络传播系统本身以及传播的社会宏观环境等几方面详细分析了我国科技文献实现网络共享的障碍。

Two-dimensional percolation lattices are used to describe urban wireless propagation environment, and random walks are employed to model radio wave propagation. The probability that a generic ray undergoes certain number of collisions at specific spatial location is derived from the Bernoulli equiprobable experiments and the maximum entropy principle.

使用二维渗流网格描述城市无线传播环境，使用随机游动过程对在该环境中传播的无线电波进行建模，在此基础上分别使用Bernoulli等概率试验和最大熵原理方法计算随机射线在传播空间的概率分布。

The propagation of Gaussian bea ms through a paraxial ABCD optical system with hard edge aperture is studied. In the treatment the rectangular function is expanded into a sum of complex Gaussia n functions, thus the approximate analytical propagation expression can be deriv ed.

对高斯光束通过有硬边光阑近轴 ABCD光学系统的传输进行了研究，采用将矩形函数展开为复高斯函数的技巧，推导出了近似的解析传输公式。

In section one, by using FICE scheme and TIME-GCM, a model of trace gases and OH airglow affected by gravity wave is set up, then the propagation of nonlinear gravity wave and the effect on trace gases and OH airglow are analyzed. The result shows gravity wave excited by tropospause forcing can propagate stably to the mesosphere through the stratosphere so that energy and momentum can be transferred from one region to another. In this process, gravity wave undergoes growth, overturning, convection and breaking. And the no-isothermal structure can accelerate the breaking of gravity wave in mesospause, and the breaking of gravity wave is an important source of convection and small-scale waves. The propagation of gravity wave will affect the distribution of minor species.

在第一部分的工作中，利用全隐欧拉格式和全球热层-电离层-中间层-电动力学环流耦合模式，对重力波的非线性传播及其在传播过程中对中高层大气中氧族和氢族成分和与之密切相关的OH气辉辐射的影响进行了数值模拟，结果表明，从对流层向上传播的重力波经历了产生、发展、饱和、对流产生直至破碎的非线性演化，大气的非等温结构加速了重力波在中层顶区的破碎，重力波的非线性传播是小尺度对流和湍流产生的一个重要的源。

The breaking of gravity wave accelerates the downward transport of atomic oxygen, some smaller-scale structures appear on the horizontal distribution of atomic oxygen number density , and other chemical species are also affected due to the chemical reaction with atomic oxygen and the propagation of gravity wave. The OH airglow volume emission rate has an obvious response to the breaking gravity wave and atomic oxygen. The nonlinear propagation of smaller vertical wavelength gravity waves can induce the double-peaked structure in the OH airglow. The results can explanation some sporadic measurements of OH airglow and can provide a good indication for studying the characteristic of nonlinear gravity wave by using OH airglow measurement.

在重力波的传播过程中，氢氧大气成分的水平和垂直分布均受到了不同程度的影响，以氧原子的响应最为明显，而其中重力波破碎在氧原子水平分布上的反应则是非线性重力波过程的一个重要表现；另外，分析显示，重力波的非线性传播对OH气辉的峰值分布由明显影响，小尺度重力波的传播有时会引起OH气辉出现奇异的双峰分布，重力波的破碎现象也可以从对气辉的观测中反映应出来，这对利用气辉观测研究重力波传播特性有非常重要的指示意义。

The former two species, Anna Marie and City of Haarlem, were employed to conducted experiment on cultivation production and bulbs propagation in order to explore the bulb production and propagation regulation of different grades of bulb.

用安娜玛丽和海姆之城进行了风信子的栽培生产与种球繁殖试验，以探讨不同等级种球生长与繁殖规律；用杜比女士和蓝马甲的鳞茎进行人工挖孔繁殖试验，以探讨人工处理增加风信子鳞茎繁殖系数的可行性。

A new symbol-constrained joint source-channel decoding algorithm for VLCs is presented.By constructing double-tree VLCs sources,the propagation-error problem is evidently alleviated.Meanwhile,by applying symbol-constrained method to MAP algorithm,not only the a priori probability of VLCs sources is efficiently utilized,but also the Symbol Error Rate is reduced enormously.

提出了一种新的针对不等长编码信源的符号约束MAP联合译码算法，利用VLCs双树信源的构造方法，有效地抑制了VLCs的错误扩散；同时，通过将"符号约束"的思想应用于最大后验概率译码算法，不仅充分利用了信源先验信息，而且极大地降低了误符号率。

In this paper, the dynamic behaviours of polymer-cement composite material are investigated, including the dynamic rigidity, internal frication and ratio of elastic energy to unelastic energy in hysteresis loop under vibration, the stress wave propagation and attenuation in this material, the impact toughness and abrasiveness.

本文研究了聚合物水泥复合材料的动力性能，其中包括动力刚度、振动状态下的内耗及振动滞后曲线中的弹性与非弹性应变能之比、应力波的传播与衰耗、冲击韧性和耐磨硬度等。

In contrast to the ubiquitous rising-sun-with-rays military flag of the Japanese, Chinese banners and ensigns feature a range of designs.

与遍地都是的太阳军旗不同，中国人的旗帜和徽章设计得各式各样。

From their small corner of Feng's Guangzhou headquarters -- a jumble of pink leashes, squeezable rubber steaks, and plastic doggy Santas for Fido's stocking -- Soleil's designers come up with at least five new products a month.

从Feng 设在广州总部的产品展示柜台上可以看到，Soleil的设计师每月至少设计出5件新产品。