在传播中

The stability of algorithm, the condition of absorbing boundary and free surface boundary, the grid dispersion and the process of source are discussed in details. The numerous simulations of wave propagation are carried out in isotropic media, transversely isotropic media and anisotropic media induced by fractures. The difference between anisotropic and isotropic effects on surface records is analysized.

接着讨论了有限差分算子的稳定性和收敛性，以及吸收边界条件、自由边界条件、数值频散和震源的处理，对各向同性介质、横向各向同性介质以及裂隙引起的各向异性介质中传播的弹性波场进行了数值模拟，分析了多波多分量数据中的各向异性效应以及各向同性在地表地震记录中的反映。

In this dissertation, the propagation of axial symmetric longitudinal wave mode under the complicated stress environment is investigated.

由于轴对称纵向模式的导波的激发和接收比较容易，且它的各种特性与板中Lamb波很类似，因此轴对称纵向模式成为了工程中利用导波进行无损检测时采用最多的一种模式，所以本文对该种模式在复杂应力环境下管壁中传播特性进行了深入的研究。

Markov chain of stochastic process theory was introduced into the reflection mathematic model by considering the fact of total reflectance when light propagate to optically thinner medium from denser medium. The reflectance mathematic model of halftone image coated with different reflectance ink layer was established and discussed.

将随机过程论中的马尔可夫链理论引入到印刷品的反射－透射数学模型中，考虑到光在由光密介质进入光疏介质中传播时会发生全反射现象的事实，讨论并建立了不同折射率油膜层叠加的半色调图像光谱反射率数学模型。

And if a poet writes of the sufferings of Niobe --the subject of the tragedy in which these iambic verses occur--or of the house of Pelops , or of the Trojan war or on any similar theme, either we must not permit him to say that these are the works of God, or if they are of God, he must devise some explanation of them such as we are seeking; he must say that God did what was just and right, and they were the better for being punished; but that those who are punished are miserable, and that God is the author of their misery-- the poet is not to be permitted to say; though he may say that the wicked are miserable because they require to be punished, and are benefited by receiving punishment from God; but that God being good is the author of evil to any one is to be strenuously denied, and not to be said or sung or heard in verse or prose by any one whether old or young in any well-ordered commonwealth.

如果诗人去描写尼俄柏丧尽儿女令石头也流泪的悲痛——这些悲剧主题在诸如此类的抑扬格诗歌中随处可见——或者去描写佩罗普斯王族的父子相残，或者去描写特洛伊战争之类的主题，那么我们不能允许诗人说这些残暴故事都是神造的孽，就算跟神有关，那也应该解释清楚来龙去脉；他应该说明神帮扶正义和真理，而那些罪人的下场都是罪有应得；而不是去描写受到惩罚的人是如何如何的悲惨，神则是炮制这些悲惨的罪魁祸首——我们是不会让诗人这么去胡编乱造的；然而诗人可以去描写邪恶之人其所以都会其悲惨的结局是因为他们必须遭受惩罚，并因他们接受神的惩罚而使大家受益匪浅；说神代表着善却又是恶的帮凶会遭到所有人的极力反对，诗文中就再也不要去传播、歌唱或者道听途说地去宣扬这些恶事了，秩序井然的联邦中人民不论老少都不应该听到这些恶事。

By the evidence of phytogeography and archaeological find as well as the historical records, this paper deals with the condition of domestication in different parts in Neolithic China.

而且很早的时候，在不同地域的人民就在长期利用自然的过程中驯化出了各具特色的栽培植物，而且一些重要的栽培植物很早就在各部落中开始了互相传播和交流。

The disturbance model can give the prediction for all the 95 shock events, while STOA model works for 89 events and ISPM model for only 72 events. We arrive at 25.26% percentage of all the 95 events with the relative time error less than 10%, 50.53% of all the events with the relative time error less than 20%, 65.26% of all the events with the relative time error less than 30%, 31.58% of all the events with the relative time error between 60%~80

实验表明，我们的模型在所有95个事件中，渡越时间相对误差小于10％的事件数占总事件数的25.26％；相对误差小于20％的占总事件数的50.53％；相对误差小于30％的占总事件的65.26％；相对误差在30％～60％的之间的事件数有30个，占总事件的31.58％；有3个事件相对误差在60％～80％之间，没有哪个事件相对误差大于80％。95个事件中我们的扰动传播模型能对所有事件进行分析给出预报值，STOA模型能给出89个预报值，而ISPM模型则只能给出72个。

Beginning with wave equation, the paper has deduced the propagation of gauss pulses in single mode fiber and fiber grating transmission compensation. The characteristics of cascaded phase-shift gratings are discussed by numerical simulations of coupled-mode theory and T-matrix method. The experimental works and measurement results are shown in this paper. On the other hand, we have introduced the basic theory of EDFA and figured out the characteristics for EDFA at different conditions by numerical simulation. Some experimental results for EDFA are also presented here. In this article, you can find the influence on Optical Fiber Amplifier by Gain Tilt, especially, the negative effect on CSO in CATV transmission system.

论文首先从波动方程入手，对高斯脉冲在单模光纤中的传播演化及光纤光栅透射补偿进行了详细的研究；较系统地介绍了光纤光栅的耦合模理论，并将传输矩阵计算法用于计算级连相移光纤光栅的光学特性；重点介绍了作者在光纤光栅刻制及特性测量方面所做的一些实验研究工作；较系统介绍了EDFA的基本理论，计算出各种条件下EDFA的光学特性，并进行了一些实验研究；综合分析光纤放大器对光纤传输系统的影响，特别分析了光纤放大器增益不平坦对光纤CATV系统中CSO恶化的原因及其解决方法，并研究了光纤布拉格光栅在稳定980nm泵浦源输出功率和输出波长方面的应用；结合一个基于光纤光栅和光纤放大器的光纤用户接入网方案，对光纤用户接入网的若干问题进行了理论与初步的实验研究。

of the thesis and thoughts about the iconological study of Tibetan Buddhism.

关于阿閦佛的信仰，在汉传密教以及由唐密传播出现的日本真言宗中有部分反映，除了在藏传佛教中以外，主要也在南亚一带流行。

In order to select optimal grid and good computation efficiency to recover the entire signal, aiming at the Ricker wavelet commonly used in forward modeling, we analyzed the alias and signal restoration problem in finite-difference method based on spatial sampling theorem and seismic wave traveling regulation in media with different velocity, to derive quantitative relationship among the modeling grid size, minimum velocity of model layer, and recovered main frequency of wavelet.

为了选择最佳的网格尺寸以及以最小的计算量完整地恢复出信号，针对地震波场正演模拟中经常使用的Ricker子波，根据空间采样定理和地震波在不同速度介质中的传播规律，分析了有限差分算法中的假频和信号恢复问题，推导出模拟网格尺寸、模型地层的最小速度和能够恢复的子波主频之间的近似定量关系，并用数值算例验证了这一关系。

The theoretical analysis indicated because in the optical fiber core base mold and disseminates in the envelope as well as in the spreading level Whisperin between the g2gallery pattern coupling, caused the curving loss vibration, this article the curving loss has carried on the simulation analysis to the single model optical fiber in along with the bevelling radius change.

理论分析表明由于光纤纤芯中的基模和在包层以及涂覆层中传播的Whisperin g2gallery 模式之间的耦合，引起了弯曲损耗的振荡，本文对单模光纤中弯曲损耗随弯曲半径的变化进行了仿真分析。

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。