正烯烃沸点与其分子结构之间定量关系的研究

本文根据分子结构的特点，借助图论探讨了正烯烃的沸点与分子结构的关系，提出了一个具有一定结构基础的定量关系。对４０种正烯烃的计算结果表明，沸点计算值都接近实验值，平均误差仅０．０５４％。     

股票指数期货与股票保值

本文介绍了股票指数期货的产生与发展，详细叙述了美国、香港等地指数期货合约规格及结算方式，并介绍了怎样利用市场趋势对股票进行套期保值。     

城市发展的可持续性测评初探

城市发展是否是可持续的已成为人们关注的焦点,如何测度与评价城市发展的可持续性尚无统一的认识。文章设计了一个评价城市可持续发展的框架,借助于常用统计数据,并利用应用统计学方法筛选出一个由17个指标构成的测评指标体系,运用层次分析法确定权重,并以天津市为实证案例,测度并评价其1990—1999年这10年间发展的可持续性。     

A spatiotemporal auto-regressive moving average model for solar radiation

Summary.  To investigate the variability in energy output from a network of photovoltaic cells, solar radiation was recorded at 10 sites every 10 min in the Pentland Hills to the south of Edinburgh. We identify spatiotemporal auto-regressive moving average models as the most appropriate to address this problem. Although previously considered computationally prohibitive to work with, we show that by approximating using toroidal space and fitting by matching auto-correlations, calculations can be substantially reduced. We find that a first-order spatiotemporal auto-regressive (STAR(1)) process with a first-order neighbourhood structure and a Matern noise process provide an adequate fit to the data, and we demonstrate its use in simulating realizations of energy output.     

资源型城市转型主导产业的选择与培育

资源型城市转型主导产业的选择是资源型城市转型成功的关键与核心问题。本文运用定性与定量相结合的方法,提出了资源型城市转型主导产业的选择指标体系,并就如何对主导产业进行选择的方法进行了探讨。同时对资源型城市转型主导产业的培育提出了相应建议与措施。     

构建科学的教坛新秀评选体系

青年教师是高校教学科研的主力军,培养和造就一批高素质的青年教师队伍是推进高校素质教育的一项重要的战略任务,但他们中有许多人存在人文精神缺失及修养不足的问题,对高校的改革与发展产生了消极影响。为切实加强青年教师队伍建设,高校在广大青年教师中开展“教坛新秀”评选活动,以此激励广大青年教师的荣誉感和责任感,促进师德水平和教育教学质量水平的提高,意义深远。从评选理念出发,对教坛新秀的评选指标、评选条件、评选方法做了微观定位,以期为构建科学的教坛新秀评选体系提供参考。     

中国股票市场价格波动特征分析

在股票市场中最令人捉摸不定,也最具有吸引力的是波动不已的股票价格。文章对中国股票市场价格波动的分析是从1997年9月展开至2002年10月,其间恰逢中国股市经历了一段从牛市的繁荣到熊市的萧条的过程,两种泾渭分明的市场氛围恰好提供了一个深入研究股票市场价格波动特征的有利契机。遵循经济控制论研究的思路,文章采用了理论分析、市场交易数据的实证研究等技术手段对中国股票市场价格波动进行了研究,通过运用经济控制论的方法建立理论模型,以上海股市和深圳股市的综合指数为样本,对中国股票市场系统本身的波动特征和稳定性进行了量化分析。     

现代化的扩散与乡村政治文化的变迁——以改革开放以来安徽和县浏塘村为例

文章遵循从基本理论到实证调查再到一般性结论的研究路径,从实证的角度去描述安徽一个普通村庄因现代化的扩散而导致的乡村政治文化的变迁,从而试图说明现代化的扩散对乡村政治文化变迁的影响。     

Tree health mapping with multispectral remote sensing data at UC Davis, California

Tree health is a critical parameter for evaluating urban ecosystem health and sustainability. Traditionally, this parameter has been derived from field surveys. We used multispectral remote sensing data and GIS techniques to determine tree health at the University of California, Davis. The study area (363 ha) contained 8,962 trees of 215 species. Tree health conditions were mapped for each physiognomic type at two scales: pixel and whole tree. At the pixel scale, each tree pixel within the tree crown was classified as either healthy or unhealthy based on vegetation index values. At the whole tree scale, raster based statistical analysis was used to calculate tree health index which is the ratio of healthy pixels to entire tree pixels within the tree crown. The tree was classified as healthy if the index was greater than 70%. Accuracy was checked against a random sample of 1,186 trees. At the whole tree level, 86% of campus trees were classified as healthy with 88% mapping accuracy. At the pixel level, 86% of the campus tree cover was classified as healthy. This tree health evaluation approach allows managers to identify the location of unhealthy trees for further diagnosis and treatment. It can be used to track the spread of disease and monitor seasonal or annual changes in tree health. Also, it provides tree health information that is fundamental to modeling and analysis of the environmental, social, and economic services produced by urban forests.     

常德市区域可持续发展评价指标体系构建

区域可持续发展能力的评价 ,是实现区域可持续发展的关键与前提。利用层次分析法和主成分分析法 ,构建常德市区域可持续发展能力的评价指标体系 ,从总量规模和结构协调两个方面对常德市区域可持续发展能力进行评价 ,可为常德市区域可持续发展的实施提供科学的依据