中美农业保险保障水平和反贫困绩效的“4E”比较

农业保险对于贫困地区脱贫有重要促进作用。美国农业保险的法律规范、财政补贴、巨灾机制等促进了其保障水平的提高。中国农业保险在财政支持、补贴品种和农业巨灾分摊机制等方面同美国仍有较大差距。“4E”评价法是评价政府绩效管理的基本原则,并在国内外的政府绩效评价中有广泛的应用。基于新公共管理理论的“4E”评价法,构建农业保险保障水平和反贫困绩效指标体系,从经济性、效率性、效益性和公平性四个方面对中美农业保险的扶贫效益进行比较。借鉴美国农业保险的成功经验,从中国农业保险的保障体系、巨灾保障机制、政策精准度和农业保险人才培养等方面,提出有助于提高中国农业保险保障和反贫困水平的政策建议。     

ABS树脂接枝结构的分析

本文报导了ABS树脂接枝结构的分析方法,主要是用O_sO_4—TBHP法将橡胶主干从双键处打断,从而得接枝AS,再测定它的分子量,并讨论了降解反应的最佳条件。     

A generalized drop-the-loser rule for multi-treatment clinical trials

Urn models are popular for response adaptive designs in clinical studies. Among different urn models, Ivanova's drop-the-loser rule is capable of producing superior adaptive treatment allocation schemes. Ivanova [2003. A play-the-winner-type urn model with reduced variability. Metrika 58, 1–13] obtained the asymptotic normality only for two treatments. Recently, Zhang et al. [2007. Generalized drop-the-loser urn for clinical trials with delayed responses. Statist. Sinica, in press] extended the drop-the-loser rule to tackle more general circumstances. However, their discussion is also limited to only two treatments. In this paper, the drop-the-loser rule is generalized to multi-treatment clinical trials, and delayed responses are allowed. Moreover, the rule can be used to target any desired pre-specified allocation proportion. Asymptotic properties, including strong consistency and asymptotic normality, are also established for general multi-treatment cases.     

现代教育观与体育教学

现代教育观的核心是发展学生创造性思维、培养学生个性发展和实践能力。体育教学应贯彻现代教育思想 ,改革传统体育教学模式 ,使体育教学在学校实施全面素质教育 ,贯彻“健康第一”的教育中发挥应有作用     

高校公共体育课与大学生体育素质培养

高校公共体育课教学以其独特优势在大学生体育意识、体育能力和体育保健等素质培养中发挥重要作用.在未来,高校公共体育课教学将以其开放性、科学性和综合性在大学生体育素质教育中发挥更大的作用.     

On the influence curve for quantal bioassay

Influence curves are defined for estimators of the ED50 in quantal bioassay, assuming a symmetic tolerance distribution. A definition of influence-curve robustness is suggested. Influence curves are obtained for L-,M- and R-estimators, and their robustness is investigated. The influence curve of the logistic maximum likelihood estimator is studied.     

Properties of occurrence-exposure rate processes in multiple decrement theory

In a basic multiple decrement model empirical occurrence-exposure rates are defined for each of k risks to which a cohort from an animal or human population is exposed over a time interval. These rates are viewed as the evolution of a stochastic process. Some asymptotic properties of this process are considered. Weak convergence of the process and its uniform strong convergence are shown under mild conditions.     

Revealed versus hidden attributes as determinants of percieved product quality

Consumers' quality perception being interpreted as an overall product evaluation process, attribute importance is introduced as a mediating variable between the quality judgment and informational value of cues. Furthermore, all product attribute being classified into two different categories, revealed vs. hidden attributes, it is hypothesized that extrinsic cues can influence consumers' product evaluation only on the hidden quality attributes but not on the revealed quality attributes.     

知识分子与五四运动

五四运动的主将和中坚是当时中国先进的知识分子.从知识分子的人格主体和文化心理层面分析,五四运动的发生与他们求真求新传播文化的职业本位意识、倡导个性追求自由的内心向往、济世救民安邦兴国的社会责任感以及其群体队伍的扩大与成熟和"抵强御侮"、"国存自强"的民族意识等紧密相关.此外,政界暂时的相对宽容和学界的思想真空也为五四运动的引发创造了社会条件.尤为可贵的是,由五四运动孕育和提炼出的五四精神(如御侮爱国、怀疑批判、求真创新、自由民主和忘我献身等)不仅有其历史价值,而且有其现实意义.     

论"五四"作家的人生态度和生命意识

在现实人生的重重困压下 ,“五四”作家理想主义的乐观转瞬即逝。他们从对人生的失望坠入悲观乃至绝望 ,这种情绪影响了他们对自我人生的把握。在对生命意义和生存价值的反复思考中 ,“五四”作家毅然打破了“苟活”的古训 ,大大加重了生死天平上个人自主权利和人格尊严的分量 ,表现出“五四”作家对个人价值特别的珍视。