在传播中

The linear theory of antisymmetric ducted gravity waves supported by mesospheric thermal duct is presented, propagation and evolution of gravity wave packets in thermal duct is also simulated by using a nonlinear two-dimensional model. Numerical results show that lower atmospheric wave disturbance can penetrate into the duct area and be trapped.

给出了重力波在中层大气温度波导中的反对称形式导制传播的线性理论模型，并采用二维非线性的数值模型对重力波波包在中层大气温度波导中的传播和演变过程进行了模拟研究。

Its prosperousness benefits from the stylistic change of the television dissemination.But under the media ecology filled of commercial logic as well as facing audience rating,the thought and the knowledge dissomination meet many obstacles,therefore its survival and the development still had the huge varies.

其兴盛得益于电视传播语态的改变，但在商业逻辑大行其道的媒介生态中以及在与收视率的抗衡中，思想与知识的传播受到诸多阻碍，故其生存和发展仍存在巨大变数。

Based on two order approximation of the variation of refraction index produced by self-action while optical pulses are traveling in Kerr-medium,the propagation equation has been solved.Furthermore,the strict analytical expressions of the amplitu

文摘：将光脉冲在克尔介质中自作用产生的折射率变化作二阶近似，求解所得到的传播方程，得到啁啾高斯脉冲幅度，脉冲宽度和周啾参数随传播距离变化的严格解析解，讨论了基模高斯脉冲孤波传播的条件。

The results of 3-D numerical modeling of the transversely isotropic media with horizontal symmetry axis and the orthorhombic symmetry media showed that quasi P wave,quasi-SV wave and quasi-SH wave occurred during elastic wave propagation in 3-D anisotropic media. Meanwhile, the special phenomena such as the S wave splitting, the blind zone of S wave splitting and quasi-SV wave-front triplication were clearly observed. In addition, the elastic wave-fronts are spatially changed, and the coupled relations among the quasi-P wave,quasi-SV wave and quasiSH wave in 3-D anisotropic media are very complex.

对方位各向异性介质模型和正交各向异性介质模型中弹性波的传播进行的三维数值模拟结果表明，弹性波在三维各向异性介质中传播时存在拟P波、拟SV波和拟SH波，并出现横波分裂、横波分裂盲区、波面三分叉等特殊现象，另外，性波场在空间是变化的，其拟P波、拟SV波和拟SH波的耦合关系比较复杂。

Growing in Chinese traditional agricultural society, Chinese opera has developed at ease in the cultural environments and communication networks which were created by its autarkic agricultural civilization. Nevertheless, when modern media—such as Shenbao, a kind of newspaper in Shanghai—occurred one by one, with a gesture of modern civilization, Chinese opera began its development and propagation within the communication networks which were cultivated by modern civilization.

戏曲艺术作为中国传统农耕社会的产物，在其原本自给自足的农耕文明所创造的文化环境和传播体系中自在发展，待到以现代文明姿态出现的《申报》等现代媒介的出现，戏曲艺术开始在现代文明所培育的传播体系中生息与繁衍。

The introduction of nonlinear advection into the model weakens the intensifying of maximum tangential wind with relative to the initial disturbance azimuthally wave numbers and intensity .2 An f-plane quasi-geostrophic barotropic vorticity equation model of high resolution is designed in this paper in order to investigate the characters of vorticity propagation and the effect of nonlinearity on the propagation within a typhoon circulation, wherein two mesoscale vortices coexist at different radial positions.

设计了一个高分辨率的f平面的准地转正压涡度方程模式，用以研究两个径向距离不等的中尺度涡旋共存条件下，台风环流内涡量传播的特征，以及非线性在此传播过程中的作用。10组试验的结果指出：与单涡条件相比，涡量内传的强度显著加强，涡量滞留在台风内区的时间加长，内区局域最大风速增大的现象更加清楚。

First, based on the analogy of the mathematical expressionbetween the propa gation of EM wave and that of seismic wavein a horizontal stratified earth, the re flectivity and transmissionformulation for EM plane wave propagating incident nor malto the layers are derived, the formulation with relation to pseudo-impulse is discussed and pseudo-impulse response is compared with impulse response of re flection seismology.

作者首先基于电磁波与地震波在水平层状介质中传播特征在数学形式上的相似性，推导了垂直入射平面电磁波在层间反射与透射传播函数，并讨论了它们与伪脉冲的关系，与反射地震学中脉冲响应作了对比。

This thesis tries to establish a "harmonic environment for mass communication" accordant with the development of society by retrospecting and summarizing the theories of the roles of mass communication and the current situation of Chinese mass media.

本研究在大众传播社会功能理论和我国大众传播现状的理论回顾和经验总结中，试图寻找一个与社会发展相协调的&和谐传播环境&。

Olympic culture has been communicated for a period of nearly 100 years. As the key of Olympic culture,the Olympic spirits has very important influence, especially in the time of Beijing hosting 2008 Olympic Games, communicating Olympic spirits with the construction of physical education on culture in campus has become the need of the new time. Physical education culture in the campus is an important part of the culture in campus. It is the briskest and the most original culture in the campus and exerts a subtle influence on the people in the campus.

奥林匹克文化在我国高校中的传播已经有近100年的历史，而奥林匹克精神作为奥林匹克文化的核心，具有丰富的内涵和良好的教育价值，在北京即将举办2008年奥运会之际，在我国高校中更广泛地弘扬与传播奥林匹克精神已成为时代发展的需求；高校校园体育文化是高校校园文化的重要组成部分，是高校师生接触最为广泛，最有活力的一种文化，对校园人有着多方面的重要影响，如何将两者相结合以实现良性的互动，有着重要的研究价值。

On the other hand, a higher frequency of CCR-64I allele was also observed in HIV-1 uninfected individuals who were heterosexually exposed to HIV-positive index partners (p=0.164), but most of the reports didn't support this result.

在异性传播病例中，有暴露史而未感染病毒者CCR2-64I的基因频率明显高于感染者，说明CCR2-64I对异性传播有一定的保护作用，不过与以往的研究不一致。多数研究认为，CCR2-64I对HIV-1异性传播无明显保护作用，有研究甚至认为是一种危险因素。

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。