民族地区生态经济协调发展之探析

西部大开发战略实施5年来已取得了举世瞩目的成就。但西部民族地区仍是我国全面建设小康社会的难点。为促其经济的持续发展,必须实施生态与经济协调发展的战略。据此,生态经济协调发展就需运用定量手段,实施“度”的有效监控;大力发展循环经济,促进生态与经济协调发展;夯实基础,对西部生态建设实施有效的后续政策。     

维生素B_2的伏安特性研究

维生素B2 在 0 1mol/LB R缓冲溶液 (pH4.5 6 )中 ,用循环伏安法得到一对氧化还原峰。峰电位Epc=- 0 .34 0V ,Epa=- 0 .312V(vs.SCE)。实验表明 ,VB2 在玻碳电极上的电极过程为一受吸附和扩散同时控制的准可逆过程。测得还原峰的电子转移系数为 0 40 ,标准速率常数为ks=43.9s-1。用该法测定了片剂VB2 的含量     

矩阵的中心化子为交换环的一个充分条件

本文给出数域P上矩阵A的中心化子作成P上n阶矩阵环的交换子环的一个充分条件,改进了[1]的结果。     

n元集r-可重复圆排列数

首先给出n元集每个元至少出现 1次的r -可重复圆排列数er(n)的计数模型 ,进而定义带符号的可重复圆排列数s(r ,n) =(- 1) r-ner(n) ,讨论了er(n)与s(r ,n)的性质 ,从而造出s(r ,n)表 .利用s(r,n)表可以方便地求出多项式数列对应的常生成函数     

Development of supplier relationship including cost of defectives in the cyclic production

In the supply chain situation, a decision regarding supplier relationship is of high importance. This usually happens on the basis of supplier company parameters. In order to satisfy the demands, a buyer company often expects the supplier company to expedite their operations, i.e., to enhance the related production rate. In this context, presently the focus of this article is on the cyclic production environment at the supplier company premises. Any practical production process is expected to generate defective products also along with the normal usable products. After an estimation of this and the costs concerning defectives, it needs to be modelled in the cyclic manufacturing. This article incorporates specifically the cost of defectives along with the other relevant costs. After developing an interest in the inclusion of these costs, the supplier company is categorised. A contribution of this article is the development of supplier relationship in the discussed environment.     

基于投入产出系数矩阵的周期增长模型

在Goodwin和Brody周期增长理论的基础上,本文构造了基于投入产出系数矩阵的开放经济非线性经济周期增长模型,并在简化情况下,利用42部门投入产出表的基础数据,对中国经济增长的周期谱进行了分析。结果表明,模型对中国经济周期的结论是适当的和稳健的。在短周期谱中,中国经济1978年以来主要表现出6年左右的周期,且数据表明,主要周期向10年左右加长。     

莆田农村庭院生态循环农业发展模式及效益分析

农村庭院生态循环农业发展模式是依据循环经济原理发展“优质、低耗、高效、高产、生态、安全”的农村庭院农业,使农民家庭实现节约资源、保护环境的生产和消费模式。莆田人多地少,农民仅靠责任田并用传统耕作方式想步入小康生活受到一定的制约,必须发展农村庭院生态循环农业,帮助农民增产增收,为莆田全面建设社会主义新农村奠定良好的基础。莆田发展农村庭院生态循环农业应遵循因地制宜、整体优化、良性循环、生态经济的原则,并在原有基础上采取加强领导,科学管理;因地制宜,做好规划;广泛宣传教育,提高认识水平;加强队伍管理,建立技术服务网络等措施完善发展模式,以期取得更高的经济、社会和生态效益。     

区域循环经济发展水平综合评价指标体系设计

循环经济是实现区域经济可持续发展的战略选择。分析区域循环经济发展水平综合评价指标体系设计的指导思想,阐述了其构建的基本原则,并结合国内外研究现状,从经济、社会、环境和资源四大系统构建了区域循环经济发展水平综合评价的指标体系。     

Some extensions of circular balanced and circular strongly balanced repeated measurements designs

Repeated measurement designs are widely used in medicine, pharmacology, animal sciences, and psychology. In this paper the works of Iqbal and Tahir (2009 Iqbal, I., and M. H. Tahir. 2009. Circular strongly balanced repeated measurements designs. Communications in Statistics—Theory and Methods 38:3686–96.[Taylor &; Francis Online], [Web of Science ®] , [Google Scholar]) and Iqbal, Tahir, and Ghazali (2010 Iqbal, I., M. H. Tahir, and S. S. A. Ghazali. 2010. Circular first- and second-order balanced repeated measurements designs. Communications in Statistics—Theory and Methods 39:228–40.[Taylor &; Francis Online], [Web of Science ®] , [Google Scholar]) are generalized for the construction of circular-balanced and circular strongly balanced repeated measurements designs through the method of cyclic shifts for three periods.     

HMO法对苯环上取代定位法则的解释

应用休克尔（Thickel）分子轨道理论对其轭分子体系的处理,通过休克尔近似,计算得到苯分子及其衍生物的分子图．并利用分子图对苯环上的取代定位经验法则进行了定量的解释．