紧致连通李群的极大环面子群

极大环面子群在李群结构及其表示理论中都是十分重要的。每个连通紧李群具有极大环面子群,任二极大环面子群彼此共轭,且连通紧李群中每个元素共轭于极大环面的一个元素。用对称空间的有关知识给出了极大子环群定理的详细证明。     

Bayesian life test planning for the Weibull distribution with given shape parameter

This paper describes Bayesian methods for life test planning with Type II censored data from a Weibull distribution, when the Weibull shape parameter is given. We use conjugate prior distributions and criteria based on estimating a quantile of interest of the lifetime distribution. One criterion is based on a precision factor for a credibility interval for a distribution quantile and the other is based on the length of the credibility interval. We provide simple closed form expressions for the relationship between the needed number of failures and the precision criteria. Examples are used to illustrate the results.Received: October 2002 / Revised: March 2004     

"泛珠三角"经济圈产业梯度转移研究

生产成本上升,资源瓶颈,腹地狭小已成为“大珠三角”发展的“软肋”,在以上方面,其他8省区相对于“大珠三角”则能优势互补,产业梯度转移成为泛珠三角区域产业发展的迫切要求。根据区域产业梯度转移规律,泛珠三角各省区具备了产业梯度转移的各项条件。在产业转移过程中,应发挥各地区的比较优势,以大珠三角为龙头,通过由港澳——粤闽发达省份——其他欠发达省份级差转移的“雁形发展模式”实施产业转移。另外,在转移中,应注重发挥企业的主体作用和政府的协调作用。     

广东省四大旅游带比较分析及互动研究

根据旅游资源特色,广东省可分为四个不同风格的旅游带。四个旅游带空间分布呈梯状,且经济发展水平差异和旅游业发展水平差异一样,呈“中心─外围”特征。要消除四大旅游带之间的“中心─外围”界限,促进四大旅游带的互动发展,建立一体化旅游市场,必须发挥政府的主导作用。     

椭圆上特殊点的准确作图原理简析

画法几何中用八点法作椭圆时,一般是根据圆的外切四边形画出平行四边形,从而确定两对特殊的共轭直径,所画椭圆的8个特殊点中总有4个点可以比较直观地确定,而其余4个点只能近似地在相应的共轭直径上求出。本文应用仿射对应等方法,阐述了准确定出椭圆周必定经过的特殊点的位置,并提出其作图的理论根据,同时提供了多种准确快速地确定这些特殊点的方法。     

Compliance of land cover changes with municipal land use planning: Evidence from the Lisbon metropolitan region (1990–2007)

In the past few decades, urbanisation has become a major phenomenon in European cities, thus representing one of the key human land cover changes with socio-economic and environmental impacts. In the Lisbon metropolitan region it is estimated that 17% of natural and farmland have been transformed into artificial areas. Since the end of 1990s, specific EU guidelines have been issued to contain urban sprawl and preserve agricultural land. Spatial planning in Portugal obviously is integrating these assumptions into the statutory land-use master plans. But what is the performance of this land use planning system regarding land cover evolution itself? Based on the Lisbon metropolitan region (LMR), one of the major areas of urban growth in Portugal, we examine spatio-temporal land cover patterns between 1990 and 2007 by integrating cross-matrix analysis, spatial metrics, and gradient analysis. Additionally, we overlay these land cover dynamics with municipal master plans that regulate land development in order to assess the compliance levels of this land-use regulatory system. Results indicate that: artificial areas are growing by coalescence and/or by scattered development along an urban–rural gradient; agricultural land is reducing and fragmentation is increasing to enlarge peri-urban spaces; there are high levels of conversion of agricultural land into urban land in protected areas, thus showing a lack of compliance to the land use regulatory system visible in the existing gaps between the original land-use assignments of the master plan and the actual developments.     

互通式立交桥的设计要点

本文对互通式立交桥设计阶段进行分析,明确适合的技术指标,匝道设计、平曲线半径、纵坡大小、超高的设计合理与否,都决定线型好坏。     

循环经济产业链形成的价值规律和政府角色

首先给出了经济系统物质流动的价值增值定律,物流方向选择的价值梯度公理和确定物流最佳数量的价值最大化定理,以此作为循环经济系统正向物流和逆向物流规划的理论依据。然后分析了循环经济系统物质流动价值增值过程,定义了循环物流价值增值倍数,发现循环经济系统的物流价值增值倍数是循环经济的核心所在。接着在生产者责任延伸的框架下,探讨了企业循环经济系统的物质循环分配的利润最大化原理和社会循环经济系统物质等价交换原理。最后讨论了政府的行政、政策等职能对循环经济系统的逆向物流市场形成和有效运行的作用。文章的研究结论对于推进循环经济物流系统和循环经济产业价值链的建设有一定的理论指导意义。     

东翼胶带机改造

文章介绍了胶带机安装及后期维护在钱营孜煤矿原煤运输系统中的应用与改造,改造后胶带机的运行良好,安全、可靠,维护方便。     

解析函数、共轭解析函数及复调和函数的一个充要条件

给出了复形式的解析函数、共轭解析函数及复调和函数充要条件的证明及其重要应用。