日本的环境经济政策及其对我国的借鉴作用

日本环境与经济双向优化发展模式为世界瞩目,完善的环境经济政策体系和执行保障体系完美结合是其主要原因。日本环境经济政策具有环境整治的立法手段与经济手段并重,着眼资源长期利用、注重循环经济发展等方面的特点。日本环境经济政策对我国的主要借鉴作用是:强化环境治理立法和执法,建立环境质量管理监督体系;科学分析环境价值,建立环境事故损失补偿机制;充分发挥公共财政作用,大力扶持环保产业发展;在环境经济政策中充分反映民意,充分借助民间力量推行环境经济政策;在经济社会发展规划中增加环境规划,使环境质量改善与经济快速增长相协调。     

规划求解工具在多级物流配送中心选址中的应用

物流配送中心是物流系统的中心枢纽,在整个物流系统中起着承上启下的作用.文章从整个物流系统的角度出发,构建多级物流配送中心的选址优化模型,使整个系统的费用最低,客户服务效果最好,并配以实例说明规划求解工具在模型求解中的应用.     

浅谈项目教学法在《VFP程序设计》教学中的应用

《VFP程序设计》课程教学,要有效的促进学生学习的主动性,激发学生的学习兴趣,提高课堂教学效果。在教学中运用项目教学法,可以激发学生学习兴趣,提前感受工作要求,培养学生独立思考,与他人协调合作的团队精神,促进学生职业能力的养成。能够取得良好的教学效果。     

远端指针应用二例

运用远端指针是Ｃ语言程序中访问内存的一种常见的有效方式，使用远端指针比较灵活，给程序员带来极大的方便。本文给出了应用远端指针的两个实例。     

A specialization of the convex simplex method to cubic programming

This paper presents a specialization of the Convex Simplex method to cubic objective functions. The algorithm selects a direction of improvement by looking at the partial derivative. An optimal step is chosen by maximizing the objective function in that direction. This involves considering quadratic derivatives and selecting the appropriate step size. The pivoting is done by either a simple Simplex pivoting or by addition of a constraint as in Beale's algorithm. The convergence and the computational efficiency of the algorithm are presented in the last section of the paper, with several examples of application of cubic programming.

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Riassunto Si presenta un adattamento del metodo «Convex Simplex» per risolvere problemi la cui funzione obiettivo è cubica. L'algoritmo analizza le derivate parziali della funzione obiettivo e indica la direzione e la variazione ottimali per procedere poi in analogia all'algoritmo di Beale. Vengono infine analizzate l'efficenza e la convergenza del metodo e considerati vari esempi pratici di applicazione della programmazione cubica.

     

网上新股申购中的资金规划研究

网上新股申购通常被认为是风险较低而收益稳定的投资策略。由于新股投资机会较为密集且短期占用资金较多,面对多个申购机会的合理取舍及资金的高效使用将显得尤为重要。通过将新股申购问题抽象为一般连续投资下的资金规划问题,给出其约束方程,指出其求解方法,然后讨论了新股申购在两种目标下的资金规划,并与未做资金规划的简单方案进行比较,结果显示该方法有效地达到了规划目标,提高了整体收益。     

Social Dependency: The Impact of Adolescent Female Culture

The purpose of this study is to identify the critical elements of adolescent girls' culture and to identify the impact of this culture on leisure behavior within an adventure education setting. Qualitative methods, specifically ethnographic focus groups and participant observation, were chosen as the most appropriate means to accomplish the goals of the study. The results suggest that adolescent girls see their world in terms of absolutes. Further, of the three innate psychological needs serving as the basis for intrinsically motivated behavior (Deci & Ryan, 1991), relatedness is the most critical concern for adolescent girls. Until this relatedness is achieved, it is unlikely that the goals of adventure and other recreation programs will be addressed or that girls will truly experience leisure. This overriding desire for status and acceptance, which was established as the theme of adolescent girls' culture, can be most accurately described as "social dependency."     

第三方物流服务供应商的选择

分析了第三方物流服务的优势;并从定性角度入手,阐述了如何实施对第三方物流服务供应商的选择;从定量角度出发,讨论了如何在层次分析法的基础上,进一步应用线性规划法建立模型,以解决多源供应商的选择及优化组合的问题。最后通过举例分析,具体说明了集成物流服务供应商作为部分物流服务的需求方,应如何对功能型物流服务供应商进行选择,并以此证明了模型的有效性和实用性。     

不动产项目与证券的混合投资组合模型

分散投资可以降低投资整体的风险并在长期投资中获得更多收益,本文提出了一个不动产项目与证券的混合投资组合模型,用半绝对偏差风险函数来计算资产组合在各个离散时间点的风险,并将双目标模型转化为单目标模型然后加以解决。同时,我们在最后将举一个例子来说明本模型。     

铁路装车地直达列车组织研究

铁路装车地直达列车作为一种高效的车流组织形式,可以提升铁路货物运输效率和服务质量,对于增强铁路运输市场竞争力具有积极作用。分析铁路车流的3种典型运输模式,以所有货车的总运输时间最短为优化目标,建立装车地直达列车编组计划优化的线性0-1规划模型,利用MATLAB软件求解。通过算例分析,验证了在装车量较小的装车站或装车量较大而无法满足整列出车条件的装车站组织开行装车地直达列车的合理性。