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排序方式: 共有53条查询结果,搜索用时 984 毫秒
1.
复射线ABCD定律及初步应用 总被引:1,自引:0,他引:1
尧德中 《电子科技大学学报(社会科学版)》1994,(6)
根据复变函数解析开拓原理提出了复射线的ABCD定律,并用它说明了高斯光束复参数的ABCD定律与几何先学ABCD定律的内在联系。 相似文献
2.
Ian Thynne 《Public Organization Review》2003,3(3):317-332
This article addresses some basic facts and ideas about organizations as a way of concluding the symposium. It identifies different types of organizations in terms of their legal-structural characteristics, and considers aspects of their legal power, ownership, financing, staffing, and outsourcing. It ends with some suggestions for further related research on organizations. 相似文献
3.
4.
Jan Grill 《Journal of ethnic and migration studies》2018,44(7):1136-1155
This article draws on long-term fieldwork among Slovak Roma migrants, identifying processes through which a haunting figure of the Roma migrant emerges across Europe, to argue for more differentiated accounts of continuing and emerging forms of racialisation. It explores how the movement of Roma (whose bodies are marked by their racialised ‘darkness’ in Slovakia) to Britain granted them a temporary escape from this modality of branding while simultaneously exposing them to different categorisations within a re-configuring classificatory matrix. The article develops the concept of ‘migrating racialisation’ in order to empirically trace how historically developed forms of racialisation in Slovakia migrate across Europe through the movement of Roma and non-Roma migrants from Eastern Europe, as well as through particular forms of knowledge circulating within transnational fields constituted not only by Roma migrants themselves but also by various institutions for ‘managing’ or ‘researching’ ‘the Roma’. This concept allows us to analyse how the recent forms of racialisation simultaneously draw on heterogenous histories and nation-state formations, social conditions and sedimented bodily dispositions, which are re-adjusted to new social conditions, discourses and emerging forms of knowledge produced about Roma migrants over the last decade in British and European contexts. 相似文献
5.
Peter A. Rogerson 《Mathematical Population Studies》2013,20(3):229-238
A procedure is suggested for estimating migration distances from data on the proportion of migrants crossing regional boundaries. The method makes use of Buffon's needle, a problem in geometrical probability from the eighteenth century that was originally used as an empirical means of estimating π. The procedure is described for various scenarios that differ in their assumptions about region shape, the spatial distribution of population, and the distribution of migration distances. An application to migration distances in the United States is given, and additional attention is given to the estimation of intraregional migration distances. 相似文献
6.
毛延生 《中南工业大学学报(社会科学版)》2011,(2):142-146
在爱丽丝·沃克的短篇小说《日用家当》中,家宅被赋予了一定的格义属性,这可以被视为19世纪女性主义文学批评语境中的心理现象学介入。家宅格义背后的心理图解划清了个体"生存空间"的原型与流变,洋溢着深切的心理几何假设内涵。作者借助不同人物对于家宅的写实性解读,提供了一个富有曲面内涵的边缘记忆空间,揭示了主体的物我元一思想已然深植于家宅意象当中,并以拓扑图腾的同胚形式得以彰显。家宅的心理几何图解立体地刻画了个体在生存空间日渐缩限时的困顿与挣扎,更是直指个体守护本我世界时的一种精神重估,而这正是该部文学作品所隐含的原生代性旨归所在。 相似文献
7.
In this paper, we reconsider the well-known oblique Procrustes problem where the usual least-squares objective function is replaced by a more robust discrepancy measure, based on the 1 norm or smooth approximations of it.We propose two approaches to the solution of this problem. One approach is based on convex analysis and uses the structure of the problem to permit a solution to the 1 norm problem. An alternative approach is to smooth the problem by working with smooth approximations to the 1 norm, and this leads to a solution process based on the solution of ordinary differential equations on manifolds. The general weighted Procrustes problem (both orthogonal and oblique) can also be solved by the latter approach. Numerical examples to illustrate the algorithms which have been developed are reported and analyzed. 相似文献
8.
由于平行公理不同,导致罗氏平面直线与欧氏平面直线有很大差异。本文利用Cayley-Klein模型探讨罗氏平面直线的特性。 相似文献
9.
天线罩覆盖的波束近轴场 总被引:2,自引:0,他引:2
本文根据复射线法对通过介质天线罩的高斯波束场进行近轴近似分析。实空间的轴向复射线追综大大简化了计算过程,而复相位差、反射-传输系数和曲面扩散系数的进一步校正则提供了相当精确的结果。所得数字结果表明,在波束的近轴区域内为获得同样的计算精度,近轴近似法所需要的计算机时间远小于复射线追综法的时间。 相似文献
10.
In this paper, we propose a method for testing absolutely regular and possibly nonstationary nonlinear time-series, with application to general AR-ARCH models. Our test statistic is based on a marked empirical process of residuals which is shown to converge to a Gaussian process with respect to the Skohorod topology. This testing procedure was first introduced by Stute [Nonparametric model checks for regression, Ann. Statist. 25 (1997), pp. 613–641] and then widely developed by Ngatchou-Wandji [Weak convergence of some marked empirical processes: Application to testing heteroscedasticity, J. Nonparametr. Stat. 14 (2002), pp. 325–339; Checking nonlinear heteroscedastic time series models, J. Statist. Plann. Inference 133 (2005), pp. 33–68; Local power of a Cramer-von Mises type test for parametric autoregressive models of order one, Compt. Math. Appl. 56(4) (2008), pp. 918–929] under more general conditions. Applications to general AR-ARCH models are given. 相似文献