上市公司财务评价研究

文章使用主成分法构建了财务评价模型,并使用层次聚类方法按评价分值进行了分类.实证研究表明,使用主成分和聚类分析相结合评价财务状况,结果客观而且合理,具有推广价值.     

毕业生就业考研总体统计分析

通过在实践中得到的数据,考研与就业的总人数并不能全面反映一个专业总的就业情况,而按照两种主成分排序的方法较能从不同方面反映不同专业的就业考研情况.     

我国技术供给能力的评价研究

本文首先在对技术供给能力含义及其与自主创新关系进行分析的基础上,提出了适合我国的技术供给能力评价指标体系;其次以此评价体系对我国各地区的技术供给能力进行了数据包络分析、主成分分析和聚类分析;最后根据分析结果,针对我国不同地区分别提出了提升技术供给能力的对策建议。     

臭氧层获求

新闻简述：前不久，墨西哥的科学家经研究发现，当地的刺果番荔枝（又名红毛榴莲）籽粒中的一种天然成分能有效杀灭传播登革热病毒的蚊虫还可以抑制蚊虫的幼虫发育为成虫。     

建材行业企业竞争力评价及聚类分析

聚类分析(ClusterAnalysis)是根据研究对象的特征对其进行分类的多元分析技术的总称。通过对建材行业839家企业2001、2002、2003年财务数据的分析,利用主成分分析法得出建材行业企业竞争力评价模型及其排序,用聚类分析法对企业竞争力排序进行分类,并得出了一些有益结论。     

口述纪录片对方言的传播创新和价值回响

在多样化的中华文明中,不同的方言所传递出的地域特色是普通话无法表现的。方言既是我国多彩文明的直观展现,更是地方非物质文化遗产的鲜活载体,在当代社会对方言的保护和传播仍具有重要现实意义。方言文化的当代价值重估,语言价值,是指作为交际系统的语言提供特定的语言成分,形成特定的结构关系,实现特定的功能。由此可以看出,功能的实现需要借助成分及其关系为主要前提条件。不同方言的民族特色恰恰为当代标准化的日常交际生活注入了色彩斑斓的底色和妙趣横生的幽默。     

Genetic analysis for brix weight per stool and its component traits in sugarcane （Saccharum officinarum）

Brix weight per stool (BW) of sugarcane is a complex trait, which is the final product of a combination of many components. Diallel cross experiments were conducted during a period of two years for BW and its five component traits, including stalk diameter (SD), stalk length (SL), stalk number (SN), stalk weight (SW), and brix scale (BS) of sugarcane. Phenotypic data of all the six traits were analyzed by mixed linear model and their phenotype variances were portioned into additive (A),dominance (D), additive×environment interaction (AE) and dominance×environment interaction (DE) effects, and the correlations of A, D, AE and DE effects between BW and its components were estimated. Conditional analysis was employed to investigate the contribution of the components traits to the variances of A, D, AE and DE effects of BW. It was observed that the heritabilities of BW were significantly attributed to A, D and DE by 23.9%, 30.9% and 28.5%, respectively. The variance of A effect for BW was significantly affected by SL, SN and BS by 25.3%, 93.7% and 17.4%, respectively. The variances of D and DE effects for BW were also significantly influenced by all the five components by 5.1%～85.5%. These determinants might be helpful in sugarcane breeding and provide valuable information for multiple-trait improvement of BW.