文学欣赏与读文教学

本文论述文学欣赏在中小学语文教学中的重要性和必要性,指出应将欣赏能力的培养渗透读文教学的各个环节。     

Nonparametric Panel Estimation of Labor Supply

In this article, we estimate structural labor supply with piecewise-linear budgets and nonseparable endogenous unobserved heterogeneity. We propose a two-stage method to address the endogeneity issue that comes from the correlation between the covariates and unobserved heterogeneity. In the first stage, Evdokimov’s nonparametric de-convolution method serves to identify the conditional distribution of unobserved heterogeneity from the quasi-reduced model that uses panel data. In the second stage, the conditional distribution is plugged into the original structural model to estimate labor supply. We apply this methodology to estimate the labor supply of U.S. married men in 2004 and 2005. Our empirical work demonstrates that ignoring the correlation between the covariates and unobserved heterogeneity will bias the estimates of wage elasticities upward. The labor elasticity estimated from a fixed effects model is less than half of that obtained from a random effects model.     

应然趋势:自然科学与社会科学的携手与合作——"科学·创新·创业"论坛专家观点综述

加强自然科学与社会科学的携手与合作,是经济社会发展的应然趋势,有利于凸显科学在经济社会发展中的作用;科研院所是培养创新型人才的主要场所,理所当然的、也必将成为自主创新的排头兵;在推进社会主义新农村建设中,科研院所必须发挥各自优势,从不同角度和学科发挥好引领作用,当好建设者、研究者;要从文化力的高度,大力发展创新文化,培育创新精神。江西要在新世纪实现跨越式发展,就必须走科技创新、自主创新之路,培养和造就千百万创新创业人才。     

The Buckley–James Estimator and Induced Smoothing

The Buckley–James (BJ) estimator is known to be consistent and efficient for a linear regression model with censored data. However, its application in practice is handicapped by the lack of a reliable numerical algorithm for finding the solution. For a given data set, the iterative approach may yield multiple solutions, or no solution at all. To alleviate this problem, we modify the induced smoothing approach originally proposed in 2005 by Brown & Wang. The resulting estimating functions become smooth, thus eliminating the tendency of the iterative procedure to oscillate between different parameter values. In addition to facilitating point estimation the smoothing approach enables easy evaluation of the projection matrix, thus providing a means of calculating standard errors. Extensive simulation studies were carried out to evaluate the performance of different estimators. In general, smoothing greatly alleviates numerical issues that arise in the estimation process. In particular, the one‐step smoothing estimator eliminates non‐convergence problems and performs similarly to full iteration until convergence. The proposed estimation procedure is illustrated using a dataset from a multiple myeloma study.     

重庆市实施旅游带动开发性移民的思路

重庆市是全国旅游资源富集地区 ,把发展旅游业与安置移民紧密结合起来 ,既是移民安置的有效途径 ,也是重庆旅游业发展的重要契机。     

加强中职环境专业学生技能考核体系的思考

环境保护是一项基本国策 ,中等职业技术学校开展环境教育是实施科教兴国战略和可持续发展战略的一个重要手段 ,中职环境教育要注重理论与实践相结合 ,建立环境专业职业技能考核体系是加强环境专业学生专业技能培养的有效途径     

中国饮料行业分析

一、行业概述饮料工业包括软饮料和啤酒,作为食品工业最具经济规模的大宗产品,也是国际竞争最活跃的领域,依靠的是实力、规模和技术,整个行业的集中化、规模化格局已初步形成。据近十年来世界饮料消费统计资料,充气饮料、茶、瓶装饮用水和果汁饮料的消费呈增长趋势,...     

论自我意识自觉之意义

在本文中,笔者认为自我意识活动涵盖自我认知活动和自我评价活动,并从个体自我的角度对自我意识自觉的意义从四个方面作出初步探讨。笔者认为,自我意识自觉意义的核心是自觉其为主体的意识;自我意识自觉是自由的首要条件,是最值得研究的;良心机制作为特例,发挥着重要的作用;面对荒诞,自我意识自觉的意义更是责任重大。     

Coordination of Supply Chains with Risk‐Averse Agents

The extant supply chain management literature has not addressed the issue of coordination in supply chains involving risk‐averse agents. We take up this issue and begin with defining a coordinating contract as one that results in a Pareto‐optimal solution acceptable to each agent. Our definition generalizes the standard one in the risk‐neutral case. We then develop coordinating contracts in three specific cases: (i) the supplier is risk neutral and the retailer maximizes his expected profit subject to a downside risk constraint; (ii) the supplier and the retailer each maximizes his own mean‐variance trade‐off; and (iii) the supplier and the retailer each maximizes his own expected utility. Moreover, in case (iii), we show that our contract yields the Nash Bargaining solution. In each case, we show how we can find the set of Pareto‐optimal solutions, and then design a contract to achieve the solutions. We also exhibit a case in which we obtain Pareto‐optimal sharing rules explicitly, and outline a procedure to obtain Pareto‐optimal solutions.     

多电子注Millitron行波管大信号理论与计算

对于一种“捆扎式多通道”新型Ｍｉｌｌｉｔｒｏｎ型耦合腔多电子注行波管，建立了大信号理论，数值计算得到了输出功率、增益、效率等主要参数，结果表明在对称激励条件下Ｎ注管的输出功率可以达到单注管的Ｎ倍。