Analysis on Landscape Ecological Risk of the Qinghai-Tibet Plateaus：A Case Study on Niyang River Basin

0IntroductionWhether the regional ecosystems are securityis determined from two aspects which arethe ecological healthandthe ecological risk.Ecologi-cal riskreferstothe sufferedinterferences and disas-ters of ecosystems,and the damaged possibilities ofecosystems structures andits function.The relation-ship betweenecological riskandecological securityisinverse function.Therefore,the analysis of regionalecological riskis ani mportant aspect of studying onecological health,which can provide plann…     

城市生态安全评价指标体系与评价方法研究

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斜带石斑鱼血液性状及生化指标的研究

研究了斜带石斑鱼血液性状及血液生化指标，并对其幼鱼与成鱼、雌鱼与雄鱼的血液性状及生化指标进行了比较分析．结果表明，与其它的硬骨鱼类相比，斜带石斑鱼的血液性状指标处于较低的水平；斜带石斑鱼幼鱼的血细胞比容及血细胞数量低于成鱼，幼鱼与成鱼在血液生化指标方面存在着显著差异；而雌雄差异不明显．结果可作为斜带石斑鱼的正常生理常数参考值。     

面向生产指标优化的选矿过程调度研究

针对选矿厂生产调度过程,本文提出了一种面向生产指标优化的选矿过程调度方法,该方法在保证精矿品位的前提下,尽量减少精矿库存,最大限度地利用设备能力.讨论了基于该方法的选矿生产调度系统的结构、功能和优化策略.采用该方法的调度系统的功能除了具备普通的调度系统的设备运行调度和资源调度功能外,还包括生产指标的优化,即以生产指标、工艺指标逐层分解和设定,逐层优化控制的思想,实现了管理和控制一体化.该系统运用于某钢铁公司选矿生产,提高了生产效率.该系统的成功实施为流程行业大系统的总体优化调度开拓了一个新方法,新思路.     

一种新型的∑△调制器行为级设计方法

介绍了一种新型的∑△调制器行为级设计方法.它分别设计∑△调制器噪声传输函数的零极点,并运用噪声功率增益作为稳定性参量来判断所设计的噪声传输函数的稳定性;同时,论文中还给出了物理实现调制器的内部积分器实现的方法,并推导出了通用∑△调制器状态变量缩放的解析公式.     

基于DFA的我国股票市场标度特性研究

将消除趋势波动分析法(DFA)应用于我国沪深两市不同时间标度收盘指数的对数收益率序列,全面分析了我国股市的标度特性.发现标度指数随着考察时间的长短,即数据个数的不同而不同,但从长期来看,两市波动都存在持久性特征,而且收益率的绝对值序列和平方值序列的持久性更明显;在相同时间范围内,不同时间标度序列的标度指数相差不大,存在标度不变性;小标度时间序列存在多重分形特征.这些结果说明我国股票市场存在复杂的非线性动力学特性.     

克拉玛依景观审美价值评价初探

基于3S技术和景观生态学理论,利用层次分析法,在获取克拉玛依不同时期景观数据后,试图在景观指数的基础上,对克拉玛依多期景观进行审美价值评价.结果表明,克拉玛依多期景观审美价值逐年提高,克拉玛依生态环境虽然有所改善但现状依然严峻.     

紧支集正交小波的自动联系函数及其导数运算

本文较为详细地给出了紧支集正交小波的自动联系函数的性质，并且显式给出了其导数计算的算法，对于常用的一阶和二阶导数，给出了它在正整节点处的数据表．     

Comparing partitions

The problem of comparing two different partitions of a finite set of objects reappears continually in the clustering literature. We begin by reviewing a well-known measure of partition correspondence often attributed to Rand (1971), discuss the issue of correcting this index for chance, and note that a recent normalization strategy developed by Morey and Agresti (1984) and adopted by others (e.g., Miligan and Cooper 1985) is based on an incorrect assumption. Then, the general problem of comparing partitions is approached indirectly by assessing the congruence of two proximity matrices using a simple cross-product measure. They are generated from corresponding partitions using various scoring rules. Special cases derivable include traditionally familiar statistics and/or ones tailored to weight certain object pairs differentially. Finally, we propose a measure based on the comparison of object triples having the advantage of a probabilistic interpretation in addition to being corrected for chance (i.e., assuming a constant value under a reasonable null hypothesis) and bounded between ±1.William H.E. Day was Acting Editor for the reviewing of this paper. We are grateful to him, Ove Frank, Charles Lewis, Glenn W. Milligan, Ivo Molenaar, Stanley S. Wasserman, and anonymous referees for helpful suggestions. Lynn Bilger and Tom Sharpe provided competent technical assistance. Partial support of Phipps Arabie's participation in this research was provided by NSF Grant SES 8310866 and ONR Contract N00014-83-K-0733.