查询词典 theory of evolution

As the evolution of economics, new classical economics has been grown for three stages in natural monopoly, and they are economics of scales, economics of scopes and subadditivity of costs in turn. We review and analyze these thoughts and theories about natural monopoly, and then forecast the trend of natural monopoly theory based on the new institute economics.

本文在对这些理论加以梳理、分析之后，借助新制度经济学的理论和分析工具，预测了自然垄断理论的发展趋势，那就是自然垄断成因由技术成本因素过度到交易成本因素，自然垄断形成机制是在经济学上的自增强机制以及交易成本约束下的一体化理论下完成的，这与先验性的决定自然垄断然后再在行政上加以规制是不同的。

Fractal is a subdiscipline of nonlinear area, researches on fractal characteristics of the deoxyribonucleic acid sequence may reveal some secret hidden in the DNA sequence during the process of biological evolution. Chaos Game Representation was proposed as a scale-independent representation for genomic sequences by Jeffrey in 1990. This technique, based on iteration function system, represents the word distribution statistics in DNA sequence as the fractal graphic. Therefore, we can get the distribution of sequence through analysis of fractal theory.

分形是非线性领域的一门分支学科，关于脱氧核糖核酸序列分形特征的研究，可以揭示生物在进化过程中隐藏在DNA序列中的某些秘密。1990年Jeffrey提出了基因组序列的与尺度无关的混沌游戏表示法，这是基于迭代函数系统的一种方法，它将DNA序列中一定长度字的分布规律表现为图形的分形特征，进而通过分形分析就可获取序列的分布规律，从而也成为DNA序列分析的一种统计方法。

Our main work is as follows: the stable laser mode theory in uniform plasmas is extended to non-uniform plasma cases; the discussion of the sufficient and necessary conditions for laser self-focusing in uniform plasmas is developed to non-uniform plasma cases; a quantitative approach to judge the impact of different plasma density distribution on laser self-focusing is proposed; the evolution properties of asymmetric laser filed in non-uniform and uniform plasmas are discussed and mechanisms that symmetric channel-like plasmas can confine the laser centroid around the plasma channel axes and symmetrize initially asymmetric laser beams are proposed; the formation of solitary standing wave in moderate plasma density is studied by PIC simulations and can be explained by stimulated Raman scattering of laser beams in plasmas.

主要工作为：把均匀等离子体中激光的稳定模理论推广到横向非均匀等离子体情形；把均匀等离子体中激光自聚焦的充分和必要条件的讨论推广到横向非均匀等离子体情形；给出横向密度分布不同的等离子体影响激光自聚焦的定量判据。讨论了初始不对称的激光场在横向非均匀及均匀等离子体中的演化特性，并提出了具有对称腔道结构的等离子体箍缩激光质心和对称化初始不对称激光场的物理机制。用粒子模拟讨论了激光场在等离子体中形成孤立驻波的过程，认为前向受激拉曼散射是发生此现象的可能机制。

In this thesis,the space structure and the evolution of the topological defects incondensed matter physics and statistical physics are studied by making using theφ-mapping topological current theory that was proposed by Professor Yishi Duan.

本文运用段一士教授建立的φ-映射拓扑流理论研究了凝聚态物理及统计物理中拓扑缺陷的空间结构和演化。

The introduction provides a general review of commentaries on Niapual and his writings, analyzes his controversial position and points out that critics'criticism of Naipaul is closely related to his complicated identity as a Trinidadian by birth, an Indian by ancestry and an Englishman by citizenship. Meanwhile, it traces the evolution of the concept of identity and builds up the basic theoretical framework of this study.Chapter One applies Lacan't theory in the study of A House for Mr. Biswas.

导言部分首先对奈保尔在批评界所引起的喝彩和争议进行了分析，指出他作为特立尼达人、印度人以及英国人的复杂身份是造成这些令人困惑的对立评价的重要原因；同时，对身份概念及其意义嬗变进行了梳理分析，以此确定了本论文的基本理论框架。

Perhaps this is evidence that yawning may be some kind of form of communication, which would support the evolution theory as well.

也许，这又可以证明，打哈欠是交流的一种形式，这同时也支持进化理论。

He applies the basic concept of Yin-Yang theory not only to the evolution ...

他不仅运用这种阴阳学说的基本观点解释中国文明历史的进程，而且他还以此来解释世界上其他的文明与历史行程。

A modified Vlasov equation which describes the evolution of the spatial and momentum distribution of axisymmetrical electron beams is developed based on the statistical dynamics theory.

利用统计动力学方法建立了描述旋转对称电子束的电子空间及动量分布演化的变态伏拉索夫方程，并在一阶旁轴近似下研究出一种半解析计算方法。

To notice the problem must treat three important contestation points:the literature inheritance,relations of politics and literature and Realism.Concerning this it is thus clear that the evolution of research methods and academic words,this provide to the angle of view,for the combine of Marxist of Chinese ancient literature theory and Naturalization of Marxist Literature...

在探讨这一问题时，要注意对待文学遗产、政治与文学关系、关于现实主义三个论争要点，从中可见研究方法与学术话语的演进，这就为中国古代文学思想马克思主义化和马克思主义文艺理论中国化相结合，并建立有中国特色的当代文学学体系提供了研究视角。

Time-dependent deformation prediction based on hydro-mechanical coupling theory is important to slope evolution research. However, because preparation processes of most of landslides take place in erodent geochemical environment near the earth surface, slope rock mass deformation differs from the time-dependent response of the underground openings wall rock to excavation.

以流-固耦合等理论为基础对岩体进行时效变形预测，对于斜坡演化研究是重要的，但是，由于大多数滑坡的孕育都是在近地表的侵蚀性地球化学环境中进行的，与深埋地下空间的开挖问题存在明显区别。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。