关于农业结构调整市场化的思考

90年代后期以来,我国农产品实现了由长期短缺到总量基本平衡,丰年有余的战略性转变,农业发展从过去主要受资源约束转向受资源、市场双重约束,并以市场约束为主,为此,农业和农村经济结构必须进行战略性调整。     

养老保险可持续发展调整机制研究

在人口老龄化压力下,各国公共养老金体系普遍面临逐步增大的支付压力,为维持系统的可持续发展,各国纷纷引入了自动调整机制。本文对公共养老金自动调整机制的国际经验做了比较分析,总结了自动调整机制的机理、特点和类型,结合我国社会养老保险的实践,测算分析了不同调整机制对制度可持续性和待遇充足性的影响,探讨了自动调整机制在我国的适用性。最后给出我国建立养老保险调整机制的建议。     

美国在巴以和平进程中的角色调整

伊拉克战后的安全问题令布什政府的外交政策备受国内外批评,使得后布什时代的美国政府将解决巴以问题作为突破口,一改往日对巴以问题的冷漠态度,转而主动推动巴以和平进程,采用多重"遏制战略"和"平衡战略"以实现自身角色的调整。然而,由于巴以问题的复杂性和美国全球霸权结构的利己性,布什政府的角色调整对于巴以和平进程具有双重绩效。     

递阶双因素模型估计信用组合一致性风险

当信用组合内资产个数较少时，基于Gordy提出的粒度调节方法计算的组合风险量度VaR将严重被低估，从而高估一致性风险量度预期短缺ES。本文利用Taylor展开式改进粒度调节方法，提高估计ES的准确性；并且假设行业因素是宏观经济因素的线性函数，由此保证了组合不变性的条件，从而扩展单因素模型为递阶双因素模型，提高相关性估计准确性，解决了单因素模型高估经济资本的问题。模拟结果显示递阶双因素模型的优越性，特别是组合内资产规模较小时，改进的效果更明显。     

美国中东政策调整与中、美、阿关系互动

迫于国际形势和国内外舆论压力，布什政府从2007年开始调整中东政策，把遏制伊朗作为政策重点。为此，美国重新扮演了巴以和平调解人的角色，主动缓和与阿拉伯国家关系。美阿关系的发展对正在积极参与中东事务的中国具有重要意义。未来中东仍是美国对外战略关注的重点，“美国因素”在中阿关系中会更加频繁，三者互动将更为密切。中国对中东问题的积极立场及对中东事务的主动参与，对于推动中、美、阿关系的良性互动将产生深远影响。     

政府采购合同的法律调整

政府采购合同是市场经济条件下政府取得物质基础 ,实现管理经济生活职能的基本法律形式。它与一定的市场主体 ,国家和社会有着密切的联系 ,有民事合同的平等要求 ,更有它自身的主体特殊性、目的公共性、资金财政性等特点。因此被规范于经济法体系中。但因其公、私法交织的特性 ,所及法律关系必然接受合同法、政府采购法等法律规范的共同调整。     

1956年初中共对知识分子政策的调整

在社会主义改造基本完成的同时,1956年初中共召开知识分子工作会议,对建国以来的知识分子政策作出了重大调整,以求调动一切积极因素,投入即将开始的大规模经济建设。但是,对于如何看待知识分子的阶级属性这个根本问题,党内仍然存在不同认识,特别是在调查和调整中没有提出并解决知识分子最为关注的两个问题：消除以往政治运动造成的不良后果,为学术研究提供一个自由宽松的环境。其结果,既给这次政策调整,也在知识分子心中留下了遗憾。     

Computing optimal adjustment schemes for the general tool-wear problem

An important problem in process adjustment using feedback is how often to sample the process and when and by how much to apply an adjustment. Minimum cost feedback schemes based on simple, but practically interesting, models for disturbances and dynamics have been discussed in several particular cases. The more general situation in which there may be measurement and adjustment errors, deterministic process drift, and costs of taking an observation, of making an adjustment, and of being off target, is considered in this article. Assuming all these costs to be known, a numerical method to minimize the overall expected cost is presented. This numerical method provides the optimal sampling interval, action limits, and amount of adjustment; and the resulting average adjustment interval, mean squared deviation from target, and minimum overall expected cost. When the costs of taking an observation, of making an adjustment, and of being off target are not known, the method can be used to choose a particular scheme by judging the advantages and disadvantages of alternative options considering the mean squared deviation they produce, the frequency with which they require observations to be made, and the resulting overall length of time between adjustments. Computer codes that perform the required computations are provided in the appendices and applied to find optimal adjustment schemes in three real examples of application.     

Connecting for success: Egocentric network types among underrepresented minority students at college

This study investigates the egocentric networks of underrepresented minority students. Adjustment to college for underrepresented minority students often means balancing between the origin (i.e., low-status family) and host (i.e., academic) environments, requiring students to develop different coping strategies. The analysis included 124 Roma university students. We employed the contact diary method and the EgoNet program for mapping students’ egocentric networks. We explored classification among egocentric networks by cluster analysis based on the network proportion of the origin, fellow, and host groups. Three clusters were distinguished. The Host-based cluster proved to be the most advantageous, while the Balancing cluster appeared to be the most disadvantageous in terms of network resources, well-being, and trust. Partners’ ethnicity and educational attainment showed a strong connection with cluster membership. Our results highlight that small fellow communities can successfully interconnect the origin and host groups in students’ egocentric networks.     

Understanding Normative Growth and Development in Aging

No abstract available for this article.