我国城乡二元反差程度未来发展趋势预测

基于1978--2004年的二元反差指数和二元对比系数数据，利用指数平滑法和ARMA模型，对未来10年的二元反差程度预测得出：如果现有政策不变，未来二元反差程度将会扩大；考虑国家自2002年以来支农政策的实施效果，从未来趋势上看，二元反差程度会进一步缩小。     

希腊爱神与中国敦煌菩萨

希腊爱神与中国敦煌菩萨作为两个不同国度、不同类型的女神 ,是中西方各自女性的理想形象。她们雕塑形象的异同 ,反映了中西文化既相互扰动 ,又独立运作的历程     

De‐Biasing the Reporting Bias in Social Media Analytics

User‐generated contents (UGC) in social media such as online reviews are inherently incomplete since we do not capture the opinions of users who do not write a review. These silent users may be systematically different than those who speak up. Such differences can be driven by users’ differing sentiments toward their shopping experiences as well as their disposition to generate UGC. Overlooking silent users’ opinions can result in a reporting bias. We develop a method to model users’ UGC generating process and then rectify this bias through an inverse probability weighting (IPW) approach. In the context of users’ movie review activities at Blockbuster.com, our results show that the average probability for a customer to post a review is 0.06 when the customer is unsatisfied with a movie, 0.23 when indifferent, and 0.32 when satisfied. The distribution of user's reporting probability with positive experience first‐order stochastically dominates the one with negative experience. Our approach provides a realistic solution for business managers to properly utilize incomplete UGC.     

权变式反向运动：社会转型期农民环境抗争的社会学阐释— — —Ｑ 村个案研究

分析社会转型期草根农民的环境抗争动因,讨论草根群体、环保 ＮＧＯ、媒体、中央政府等应对污染所兴起的环境保护“反向运动”,探讨了中国农民环境抗争的本土经验。 研究发现,社会转型期的社会结构、经济体制、价值观念的变迁以及企业的理性困惑所造成的“政经一体化”引发了农民的环境抗争;农民环境抗争的胜利与“反向运动”主体间的互动密切相关;与西方大规模环境运动不同,城郊村落农民环境抗争在依法抗争、理性维权、依势抗争等抗争类型间根据情境切换,呈现出权变的特点。     

基于Logistic模型的财富逆转移因素分析及程度测定

构建Logistic回归模型,并以北京市为例测定其财富逆转移程度.从财富逆转移的角度研究城市贫富差距扩大会导致公共危机的爆发,要素价格扭曲、转移支付体系不健全、市场机会不均、房价等因素直接影响社会财富的逆转移,并进一步扩大城市的贫富差距.结果表明:2013年的财富逆转移程度略大于2008年.政府可以通过降低要素价格的扭曲程度,不断完善税收和转移支付体系,加强就业及促进市场机会均等,控制房价的上涨速度,来减缓财富的逆转移程度.     

Assessing the treatment effect in a randomized controlled trial with extensive non‐adherence: the EVOLVE trial

Intention‐to‐treat (ITT) analysis is widely used to establish efficacy in randomized clinical trials. However, in a long‐term outcomes study where non‐adherence to study drug is substantial, the on‐treatment effect of the study drug may be underestimated using the ITT analysis. The analyses presented herein are from the EVOLVE trial, a double‐blind, placebo‐controlled, event‐driven cardiovascular outcomes study conducted to assess whether a treatment regimen including cinacalcet compared with placebo in addition to other conventional therapies reduces the risk of mortality and major cardiovascular events in patients receiving hemodialysis with secondary hyperparathyroidism. Pre‐specified sensitivity analyses were performed to assess the impact of non‐adherence on the estimated effect of cinacalcet. These analyses included lag‐censoring, inverse probability of censoring weights (IPCW), rank preserving structural failure time model (RPSFTM) and iterative parameter estimation (IPE). The relative hazard (cinacalcet versus placebo) of mortality and major cardiovascular events was 0.93 (95% confidence interval 0.85, 1.02) using the ITT analysis; 0.85 (0.76, 0.95) using lag‐censoring analysis; 0.81 (0.70, 0.92) using IPCW; 0.85 (0.66, 1.04) using RPSFTM and 0.85 (0.75, 0.96) using IPE. These analyses, while not providing definitive evidence, suggest that the intervention may have an effect while subjects are receiving treatment. The ITT method remains the established method to evaluate efficacy of a new treatment; however, additional analyses should be considered to assess the on‐treatment effect when substantial non‐adherence to study drug is expected or observed. Copyright © 2015 John Wiley & Sons, Ltd.     

阶乘幂的差分算子及其逆

与微分算子及其逆算子积分算子作比较,讨论了差分算子及其逆算子(和分).主要结果为关于乘积的k-阶差分的Leibniz公式(定理6.3)以及乘积的k-阶和分的对偶公式(定理6.4).显然,差分算子及其逆算子是阶乘幂多项式的方便工具.     

一维非标准热传导方程热源识别的Fourier正则化方法

探讨了热源项形式为的热传导方程的反问题。根据热传导方程的正问题理论,建立了一个联系测量数据和未知源项的积分恒等式。利用Fourier正则化方法,给出了误差估计。     

网络最大流Pareto扩充研究

将网络容量定义为最大s-t流的流量,建立了带有时间和费用双重限制下的网络容量扩充问题模型。通过网络变换,将该问题转化为可利用成熟算法求解的线性最小费用流问题。研究了给定网络容量扩充目标要求下,求解所有关于时间和费用的Pareto优化解问题并提供了相应算法。研究内容不仅适用于各种情形的容量扩充问题,而且还可应用于网络规划。最后通过具体例子的求解,说明了算法的正确性和有效性。     

高校代数教学研究之一:通过小课题 引导学生主动积极学习

本文就高校代数教师如何利用一些较浅近的课题引导学生主动积极学习,以克服代数学习中的由抽象性、严密性带来的单调枯燥的学习,以增加学生学习的兴趣。提出了从综述、数学方法论、反思、计算技巧,由习题引出的问题等几个方面提出小课题。