一种新的L-集表现定理   总被引：1，自引：1，他引：0  

方进明  韩元良 《中国海洋大学学报(自然科学版)》2008,38(6)

在隶属度值格仅为完备格的条件下,研究了L-集轮和L-开集轮的特征性质,并以2种集轮为工具给出基于L-集轮和L-开集轮的L-集表现定理.由于隶属度值格仅为完备格,得到的L-集表现定理更有一般意义.  相似文献   

浪流作用下系泊船舶撞击力和系缆力试验研究     

李焱  郑宝友  高峰  孟祥玮 《海洋工程》2007,25(2):57-63

以某25万吨矿石码头工程为例,分别进行了单流、单浪和浪流共同作用下,系泊船舶撞击力和系缆力试验。研究了不同水位、不同船舶载度、不同浪流夹角,单流、单浪和浪流共同作用时对船舶撞击力和系缆力的影响。分析了该码头工程护舷和缆绳的布置情况,为工程设计提供了依据。  相似文献   

A joint distribution of significant wave height and characteristic surf parameter     

Dag Myrhaug  Sébastien Fouques 《Coastal Engineering》2010

The paper provides a joint distribution of significant wave height and characteristic surf parameter. The characteristic surf parameter is given by the ratio between the slope of a beach or a structure and the square root of the characteristic wave steepness in deep water defined in terms of the significant wave height and the spectral peak period. The characteristic surf parameter is used to characterize surf zone processes and is relevant for e.g. wave run-up on beaches and coastal structures. The paper presents statistical properties of the wave parameters as well as an example of results corresponding to typical field conditions.  相似文献   

Minimal cut-based recursive decomposition algorithm for seismic reliability evaluation of lifeline networks     

李杰  钱摇琨  刘威 《地震工程与工程振动(英文版)》2007,6(1):21-28

In this paper, a new probabilistic analytical approach, the minimal cut-based recursive decomposition algorithm (MCRDA), is presented to evaluate the seismic reliability of large-scale lifeline systems. Based on the minimal cut searching algorithm, the approach calculates the disjoint minimal cuts one by one using the basic procedure of the recursive decomposition method. At the same time, the process obtains the disjoint minimal paths of the system. In order to improve the computation efficiency, probabilistic inequality is used to calculate a solution that satisfies the prescribed error bound. A series of case studies show that MCRDA converges rapidly when the edges of the systems have low reliabilities. Therefore, the approach can be used to evaluate large-scale lifeline systems subjected to strong seismic wave excitation.  相似文献   

Interpolation by regularized spline with tension: II. Application to terrain modeling and surface geometry analysis   总被引：1，自引：0，他引：1  

Helena Mitáová  Jaroslav Hofierka 《Mathematical Geology》1993,25(6):657-669

A general approach to the computation of basic topographic parameters independent of the spatial distribution of given elevation data is developed. The approach is based on an interpolation function with regular first and second order derivatives and on application of basic principles of differential geometry. General equations for computation of profile, plan, and tangential curvatures are derived. A new algorithm for construction of slope curves is developed using a combined grid and vector approach. Resulting slope curves better fulfill the condition of orthogonality to contours than standard grid algorithms. Presented methods are applied to topographic analysis of a watershed in central Illinois.  相似文献   

地形图等高线成组综合的试验   总被引：15，自引：0，他引：15  

费立凡 《武汉大学学报(信息科学版)》1993,(Z1)

本文在讨论制图自动综合一般问题的基础上,着重分析了两种等高线自动综合的技术路线存在的优缺点。笔者提出,采用模拟人类专家智能的方法,从二维的等高线输入数据出发,提取地貌结构信息,从而对等高线进行成组的综合,直接形成经综合的二维等高线输出数据,有可能获得较为简捷,效果良好的综合结果。在对这条技术路线进行实验的过程中所涉及的人工智能问题,主要包括:对无序数字化等高线数据的整理、等高线上重要特征点的识别、正负向地貌特征的确定、谷地点的选出、谷底线的自动跟踪、谷地重要性的计算、谷间距的自动量算、对称谷地的寻找、综合后图形的生成等。  相似文献   

矿岩界线的自动推连     

张正禄  金国胜  李清泉 《武汉大学学报(信息科学版)》1994,(3)

着重讨论了如何利用人工智能技术进行矿岩界线的自动推断和连接，包括对所研制的基于知识的矿岩界线自动推连系统（ＡＩＳＭＢ）的措述，关于数据与知识的表示和组织、推理过程、策略以及系统实现等内容。  相似文献   

任意阶次磁多极子场力线方程的解析表示          下载免费PDF全文

马石庄 《地球物理学报》1994,37(5):703-706

本文证明任意阶次磁多极子场力线方程总可以用有限形式解析地表示，并对偶极族和四极族磁多极子场力线的位形给予注记。  相似文献   

Hydrogen recombination lines near 327 MHz−II: A Galactic plane survey with a 2°×6′ beam     

D. Anish Roshi  K. R. Anantharamaiah 《Journal of Astrophysics and Astronomy》2001,22(1):81-119

In a previous paper we presented a low-resolution (2°×2°) survey of radio recombination lines (RRLs) at 327 MHz in the longitude rangel=330° to 0° to 89°. In this paper, we present the results of a higher resolution (2°×6′) survey of RRLs from seven 2°-wide fields and two 6°-wide fields in the same longitude range. Observations were made using the Ooty Radio Telescope (ORT). A total of 252 spectra that were obtained are presented. RRLs were detected in almost all the individual positions within the fields withl<35° and at several individual positions within the fields in the longitude rangel=35° to 85°. Detailed analysis of the data towards the field centered at G45.5+0.0, shows that the line emission consists of discrete zones of ionized gas. The angular extent of these zones are likely to be one degree or more corresponding to a linear size of >110 pc at the kinematic distance.  相似文献   

线路平行线间面积计算的统一简捷模型     

李全信 《四川测绘》2001,24(4):172-174

本文根据线路平行线间面积计算的统一模型，分别推证了直线，圆曲和缓和曲线段平行线间面积计算的简捷模型，据此归纳出线路平行线间面积计算的统一简捷模型，它在线路土地征及用建材用料计算等方面都有广泛的应用。  相似文献