在传播中

Researched influence of frequency on characteristic of electromagnetic wave transmission in tunnels, and analyzed characteristic of electromagnetic wave transmission in circular, arches and curved tunnels by method of metal wave guide, and gives approximate formulas of attenuation rate. Main conclusions we obtain are as follows: in circular,rches tunnels, if frequency is higher, attenuation rate is smaller, it is beneficial for EM waves to transmit, in curved tunnel, higher frequency, more attenuation rate ...

研究了频率对井下电磁波传输特性的影响，采用金属波导法分析了圆形、拱形及弯曲隧道中电磁波的传输特性并给出衰减率近似公式，得出主要结论：在圆形和拱形隧道中，频率越高，衰减率越小，越有利于电磁波的传播；在弯曲隧道中，频率越高，衰减率越大，不利于电磁波的传播；通过特性曲线与井下实验数据相比较得出在900MHz左右为井下无线通信系统传输信号最佳频段。

In the traditional GSM network planning, the revised Hata model serves as the prototype, and the coefficient in the model formula is tuned according to the data obtained in the radio propagation feature test specific to local actual radio environment, so as to obtain the propagation model for practical prediction. A common digital map only contains the clutter information and the digital terrain model information. So the building designers cannot fully allow for the influence of radio propagation, and can only estimate the influence on the building roughly from a traditional perspective, e.g., consider the influence of different clutters through certain clutter offset.

在传统的GSM网络规划中，一般都以修正的Hata模型为原型，再利用规划软件通过导入针对当地的实际无线环境做无线传播特性测试所得的数据对模型公式中的系数进行修正而得到实际预测用的传播模型，一般使用的数字地图仅包括地物信息和高程信息，因此建筑物对无线传播的影响无法充分考虑，只能从统计意义上对建筑物的影响进行粗略的估计，如通过一定的地物偏移来考虑不同地物的影响。

The present thesis aims mainly at studying power absorption of high frequency electromagnetic waves in partially ionized plasma layer in atmospheric conditions, with effects of negative ions in atmosphere, collision rate between electron and neuter gas, the external magnetic field, and nonlinear effects on power absorption of high frequency electromagnetic waves in partially ionized plasma layer under atmospheric conditions.

本文主要研究了高频电磁波在大气压等离子体层中传播和吸收的特性，着重考虑了大气中的负离子、电子与中性气体的碰撞频率、外加磁场、以及非线性现象对高频电磁波在大气压等离子体层中的传播的物理机制和吸收的影响。

The wave going along the spreading direction is the longitudinal wave, vibrating in one dimension space at high speed.

第一种是沿传播方向前后震动的分震动，沿传播方向传播出去就成为纵波，在一维空间中震动，传播速度最快。

Rich guest acted two parts at the same time in our advertisement sale link, since media is a person , the transmission channel of since broadcast type is to get numerous group, can rise media transmission and human transmission union well, through the meshy connection between rich guest and rich guest enlarge goes dispersedly, enlarge spreads effect.

博客在我们的广告营销环节中同时扮演了两个角色，既是媒体又是人，既是广播式的传播渠道又是受众群体，能够很好地把媒体传播和人际传播结合起来，通过博客与博客之间的网状联系扩散开去，放大传播效应。

This paper discusses some application cases of the error propagation law by the examples of trigonometrical survey, and presents that not only sum function and numeral multipling function in which there is only one independent observed value but also more complex functions which are equal in mathematics are not opposite in the process of error propagation according to the error propagation law.

1引言本文以三角测量为例，对误差传播定律一些应用问题进行了讨论，指出当只有一个独立的观测值时，和函数与倍数函数运用误差传播定律不会出现悖论；如果在测量工作中有多余的直接观测值，就需用平差后的间接观测值按协方差传播律来计算，这样数学中相等的函数关系才能得到同样的函

The properties of blast loading are that it is highly impulsive, exhibiting high-pressures but lasting for a very short duration. The propagation process of shock wave produced in steel-concrete composite beams subjected to blast loading is very short. And there is only small deformation for the beam during the time of the propagation process of wave.

由于爆炸荷载作用时间短、超压峰值大等特点，当爆炸荷载作用于钢－混凝土组合梁上时，将在梁内产生冲击波，冲击波在钢－混凝土组合梁内的传播过程极短，并且在冲击波的传播过程中梁的变形很小，因此，可将冲击波在梁内的传播过程进行独立分析。

The second chapter probes into the way and feature of spreading on Gesar" s music, and the development and the changes of the music spreading since the involving of modern intermedium, by introducing the psalmodies in different categories. The third chapter analyses the types of Gesar" s lyrics and the patterns they could change. The forth chapter illustrates the principles of Gesar" s creating and several majority tone patterns are showed here. In the fifth chapter, the tones of Gesar are classified based on three aspects, that is, the tone" s name, utilization and the localstyles. In the sixth chapter, the feature of Gesar s tones is analyzed from the aspect of the characteristics of melody, the rhythm and time, the tone patterns and the music structure and so on. The last chapter discusses the forms of music performance and the methods that the psalmodies take to sing.

本文第一章从史诗《格萨尔》说唱结合艺术形式的产生与发展开始，对它的这种艺术形式中的说与唱分别做了介绍；第二章通过对《格萨尔》音乐创作主体——艺人的分类介绍，探讨了史诗音乐的传播方式、传播特点以及在现代传播媒介的介入下它的传播方式的发展与变化；第三章是对唱词体裁的分析和它的变化类型；第四章论述了音乐唱腔的创作原则以及几种最主要的唱腔类型；第五章从曲调的名称、曲调的运用以及地域风格特点三方面对《格萨尔》唱腔进行了分类；第六章结合谱例从旋律特征、节奏节拍、调式以及音乐结构等方面分析了《格萨尔》音乐唱腔的特点；第七章是对《格萨尔》音乐表演形式及艺人演唱方法的探讨。

For strong disturbance case in which Δp is set to be 5, by examining the distributions of relevant physical quantities along radial direction and the normal of wave front, we can infer that the slow wave introduced by the strong pressure pulse steepens into slow shock during the propagation process.

与二维情形类似，沿由源区出发的径向，可以分辨出压力脉冲增长相所引起的前导快波与后随慢波的传播，同时还可观察到压力脉冲恢复相所导致的快模磁声波的传播，由于传播速度的差异，该波动在向外传播的过程中逐渐超过后随慢波。

The whole-space response characteristics for three dimensional conductive body located in the floor of the mine drift either in homogeneous medium or in layered medium was simulated, with using Mur absorbing boundary condition and taking a electrical dipole source in homogeneous whole space as a initial source; the diffused regularity of the transient field in homogeneous medium at 1.9 μs and 27.6 μs,and in layered medium at 1.2 μs and 0.023 ms was discussed.

利用Mur吸收边界条件，选用均匀全空间电偶极源作为初始激发源，模拟了均匀介质中巷道底板岩层内部和层状介质中三维低阻异常体的全空间响应特性，分析了瞬变电磁场在均匀介质中1.9 μs和27.6 μs两时刻的传播规律及在层状介质中1.2 μs和0.023 ms两时刻的传播规律。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。