Expected sample moments of concomitants of selected order statistics

In this paper, the task of determining expected values of sample moments, where the sample members have been selected based on noisy information, is considered. This task is a recurring problem in the theory of evolution strategies. Exact expressions for expected values of sums of products of concomitants of selected order statistics are derived. Then, using Edgeworth and Cornish-Fisher approximations, explicit results that depend on coefficients that can be determined numerically are obtained. While the results are exact only for normal populations, it is shown experimentally that including skewness and kurtosis in the calculations can yield greatly improved results for other distributions.     

全球公共产品筹资方式研究

本文主要分析了全球公共产品的定义、分类、筹资主体和筹资方式。经济全球化进程引发了很多问题,迫切呼唤全球公共产品的充足供给。传统的公共产品研究大量的扩充到全球。全球公共产品的研究当前主要集中在无政府状态下由谁来筹资并提供全球公共物品和以什么方式筹资的问题。本文经过分析总结出霸权国家、全球国际组织、区域组织、全球市民社会、单个国家、公民个人、企业都是筹资者。筹资方式主要有托宾税方式、特别提款权、集成技术、利益主导性集团方式、选择性激励和意识形态。最后,本文认为怎样更丰富的提供全球公共物品并对其供给进行有效的管理是今后研究的重点。     

老年人乡村休闲养老意愿影响因素实证考察——以重庆主城都市区为例

乡村休闲养老产业发展丰富了农村产业业态,是实现乡村产业振兴的重要抓手,也是缓和城市养老压力和提高人民生活质量的重要举措。文章基于2020年9月—2020年12月重庆市主城都市区的问卷调查数据,采用logistic模型验证了影响老年人乡村休闲养老参与意愿的因素。研究结果表明家庭代际冲突、健康程度、自然环境、硬件及配套设施、服务质量均能对老年人参与意愿产生显著影响,但影响效果有所差异。结合研究结论,为推动重庆乡村休闲养老产业发展,增强参与意愿,文章提出了相应对策建议。     

论理学工夫的本质

工夫或工夫论是宋明理学重要组成部分,工夫的中心任务是实现气质之心与绝对天理的统一.最重要的工夫是敬,敬以心理合一为分界线.合一之前的敬叫做未发之敬,合一之后的敬叫已发之敬.未发之敬,虚心以待天理,这便是涵养.已发之敬,便是不断地省察,从而巩固心理联盟.心理合一的工夫,又分别叫做笃信、立志、诚意等.敬而生信,在笃信活动中,人们将外在的天理转化为内在的道理,从而实现由外向内的转折.信以发志,在立志活动中,人们将对天理的认知转化为践行,从而实现由知向行的转折.这些转折活动,实质上是变化气质.诚意便是变化气质的工夫,诚意的内容是将不可靠的气质改变为可靠的气质,气质活动因此合理.人类行为因为符合天理而获得了合法性.心理合一的出现,标志着人类从自然性生存转化为超越性的生存.     

农业绿色全要素生产率测度及收敛性分析——基于碳汇和碳排放双重视角CSSCI

对农业绿色全要素生产率进行科学合理的测度有助于精准把握农业碳减排潜力。本文基于2000—2019年我国省际面板数据,分别从碳汇和碳排放两个角度测度农业绿色全要素生产率,并进行了空间收敛性分析。结果表明:(1)考察期内农业绿色全要素生产率年均增速为1.1%,农业技术进步是其增长的主要动因;(2)农业绿色全要素生产率在时空演化过程中具有差异性和阶段化特征;(3)农业绿色全要素生产率呈现显著正向空间关联性,且逐渐强化,农业绿色全要素生产率较低地区发展速度要高于农业绿色全要素生产率较高地区,区域差异正在减小。研究结果对于精准评判农业碳减排潜力和碳吸收能力、实现“双碳”目标具有参考意义。     

生态创新的财政政策支持：一个文献综述

生态创新是促进经济与环境协调发展的驱动力。已有文献对生态创新内涵的界定并不统一,但对生态创新对于绿色发展、循环发展、低碳发展的促进作用却是一致认可的。生态创新具有双重外部性：环境保护的正外部性和知识溢出的正外部性。这使得经济主体缺乏主动生态创新的动力,所以政府监管的推拉效应和制度政策的激励效应对生态创新十分重要,财政政策更是激发生态创新的重要手段。既往研究在研究尺度上更加偏重企业生态创新,相对缺乏对区域生态创新的全面研究;在研究对象上更加偏重单项财政政策,相对缺乏对政策间替代性或互补性关系的深入探讨;在研究方法上则更加偏重定性分析,相对缺乏对定量手段的优化应用。未来研究可将重点放在区域生态创新领域,注重财政政策的组合以及生态创新在区域间的协同,构建促进生态创新的财政政策体系,既在学术研究中寻求突破,又在绿色发展实践中提供支撑。     

Going to Pieces: Paul Monette and the Fragments of the Tribe

Author of the highly acclaimed Borrowed Time: An AIDS Memoir (1988) and winner of the 1992 National Book Award for his autobiography Becoming a Man: Half a Life Story, Paul Monette died of complications from AIDS in Los Angeles on February 12, 1995. His most recent work, Last Watch of the Night: Essays Too Personal and Otherwise (1994), is his third volume in a trilogy of autobiographical writing on growing up gay, coming-out, and living with AIDS. A graduate of Phillips Academy and Yale University, Monette received a number of awards for his writing and his work as an outspoken voice in the battle against AIDS, including the National Book Award, three Lambda Literary awards, the PEN Center West Freedom to Write Award, and three honorary doctorate degrees, from Wesleyan University, the City University of New York, and the State University of New York at Oswego. A memorial service was held for Monette on Sunday, February 19, 1995, at the Directors Guild of America on Sunset Boulevard in Los Angeles. Paul Monette was 49.     

Sensitivity of the Optimum to Perturbations of the Profit or Weight of an Item in the Binary Knapsack Problem

In the binary single constraint Knapsack Problem, denoted KP, we are given a knapsack of fixed capacity c and a set of n items. Each item j, j = 1,...,n, has an associated size or weight w_j and a profit p_j. The goal is to determine whether or not item j, j = 1,...,n, should be included in the knapsack. The objective is to maximize the total profit without exceeding the capacity c of the knapsack. In this paper, we study the sensitivity of the optimum of the KP to perturbations of either the profit or the weight of an item. We give approximate and exact interval limits for both cases (profit and weight) and propose several polynomial time algorithms able to reach these interval limits. The performance of the proposed algorithms are evaluated on a large number of problem instances.     

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Dual Career Couples als eine Variante von Work-Life-Integration

Dual Career Couples as a form of work-life-integrationThe author discusses the situation of dual career couples, when both are university graduates following an own career. Basing on a respective publication she delineates the current, mostly American research and reports on several German research projects, which endeavour to analyse the relation between gender and inequality in dual career couples.