随机性

Department of Fish Ecology and Evolution, EAWAG Center of Ecology, Evolution and Biogeochemistry, 6047 Kastanienbaum, Switzerland

长期以来，学术界对自发突变机制的经典认识是，自发突变具有随机性和稀有性。

Considering the factors such as randomness of natural lightning locus and the coexistence of primary and secondary leaders, it is necessary to lead in the concept of dynamic lightning protection shielding angle. It is suggested that the angular bisector of practical protective angle formed by ground wire or earth pin in UHVAC transmission line and conductor should be aligned with the direction of lightning leader as well as the ratio of vertical span to horizontal span and the impact of wind speed should be considered.

考虑自然闪电轨迹的随机性和雷电主先导与次先导并存现象等因素，有必要引入动态防雷保护角概念，建议特高压交流线路中地线对导线的实际保护角形成的角平分线应与雷电先导的来向一致，并应计及垂直档距和水平档距的比值和风速的影响。

The result of analysis of seepage control will be better if we do not neglect blemish in important part .

本文通过随机数的引入，初步探讨了损伤的大小、个数及其分布的随机性。

De Bonet synthesizes new images by randomizing an input texture sample while preserving the cross-scale dependencies.

另外一些算法是在纹理建模时设置一组特性，并且通过比较纹理取样时的特性生成新的纹理，Heeger和Bergen [HB95][TM97]通过比较图像金字塔的边缘柱状图进行纹理建模，他们的技术在随机性纹理上比较成功，但针对结构纹理效果并不理想。

AS compared with the alloy of higher Cr content, the nucleation and growth of methetable pits for the low Cr alloy were faster,and its pitting breakdown potential Eb was more cathodic and scattered in a wider potential range.

含Cr量较低（7wt％）的合金与含Cr量较高（13wt％）的合金相比，亚稳孔的形核速度和生长速度均较快，孔蚀破坏电位Eb较负，且随机性更大。

The application of the stochastic fractal brownian motion theory in image matching have been studied.

不仅进一步完善了分形理论，同时对图象处理的技术进行了改进。1研究了随机性分形布朗运动FBM理论在匹配过程中的应用。

March 8, 2005 — Pancreatic cancer patients with cachexia may benefit from thalidomide, according to the results of a randomized study published in the April issue of Gut .

March 8， 2005 -一项刊载於四月份Gut期刊的随机性研究结果显示，恶病质的胰脏癌患者，可以藉由thalidomide而获得良好的治疗。

Variation function,which is the core and a basic tool of geostatistics,can describe not only the spatial structure change,but also the randomicity change of the regional variable .

变异函数是地质统计学的核心内容和基本工具，它既能描述区域化变量的空间结构性变化，又能描述其随机性变化。

The mobile trunk communication network has such characteristics as mobility,flexibility and changefulness,which has the particular requirements on the network invulnerability,reliability and survivability.

0引言机动干线通信网一般以无线传输方式为主，信道较窄，业务随机性很强，具有机动、灵活、多变性，对网络的抗毁性、可靠性、生存性等有着特殊的要求。

There are randomicity on material character and geometrical size in structure of concrete self-anchored suspension bridge.

混凝土自锚式悬索桥材料特性、几何尺寸的随机性对结构的响应的影响是比较显著的。

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。