冻结斜井流砂层段井壁壁后注浆技术的研究与应用

为了提高注浆加固体的承载性能和抗渗性能,本文从井壁壁后注浆技术的角度进行阐述。通过对李家坝煤矿的工程概况和施工现状进行分析,重点研究井壁壁后注浆技术方案与参数,进而为充填井壁、加固围岩提供参考依据。     

Girls for Sale? Child Sex Ratio and Girl Trafficking in India

ABSTRACT

Illegal trafficking of girls results from their disadvantageous position in society, often reflected by preference for sons and neglect of daughters. India has both higher levels of illegal trafficking of girls and abnormal child sex ratios in favor of boys. This paper examines if the skewed sex ratio in India is associated with trafficking of girls. Using panel data from twenty-nine Indian states from 1980 to 2011, the study finds that a 100-unit increase in the child sex ratio is associated with a 0.635 percent increase in girl trafficking. Further, the association is heterogeneous by women’s empowerment, crime against women, and party rule in the state, and the association between the child sex ratio and trafficking of girls is stronger and larger in magnitude in states with greater women’s empowerment. Overall, it appears the results are driven both by greater reporting and a greater incidence of illegal girl trafficking.     

大股东控制与现金持有价值关系的经验研究

本文以沪深两市2005—2010年391家上市公司为样本,检验了大股东控制对中国上市公司现金持有价值的影响。研究发现,第一大股东持股比例与企业价值间是一种近似U型的非线性关系,第一大股东持股比例的临界点为45%。将第一大股东持股比例与现金持有量的交互项引入模型,回归发现,当第一大股东持股比例小于45%时,交互项的系数显著为负,大股东控制的壕沟效应占主导;当第一大股东持股比例超过45%时,交互项的回归结果不显著。没有证据表明第一大股东性质会对企业价值发挥显著影响。     

某水库工程地质问题浅析

水库存在坝体填筑质量差,坝基处理不彻底,大坝心墙防渗体及坝基存在渗漏等工程地质问题,经过对大坝进行防渗加固处理,大坝目前运行良好。     

百万等级机组塔式锅炉螺旋水冷壁安装工艺研究

上海外高桥第三发电厂2×1000MW机组工程拥有二台超超临界的塔式锅炉,针对其螺旋水冷壁的安装特点,设计制造了一副炉膛内垂直升降吊架满足安装需要。本文总结和论述该吊架在1000MW机组锅炉安装中的设计与应用。     

基于改进的BP-LM在中国人口老龄化预测中的应用

由于人口老龄化率的预测具有高度非线性特征，这与BP神经网络能够处理非线性问题的特征相符合，但BP神经网络算法易使解陷入局部极小。基于L-M算法的改进BP神经网络可以有效克服这一问题，而且收敛速度快。通过具体的仿真及实践结果验证了改进BP的有效性，并对未来五年的中国老龄化率进行了预测。     

论环保型外墙涂料的施工质量控制

环保型涂料是一种性能优良、用途广泛的新型外墙涂料.文章在简要介绍环保型涂料分类的基础上,针对环保型外墙涂料的特殊性,提出适用性的施工质量控制要点.     

A Framework for Reconsidering the Lake Wobegon Effect

The Lake Wobegon Effect (LWE) describes the potential measurement-error bias introduced into survey-based analyses of education issues. Although this effect potentially applies to any student-report variable, the systematic overreporting of academic achievements such as grade point average is often of preeminent concern. This concern can be easily circumvented if official records data are available; however, many researchers can only access student-reported data. In this article, the authors examine whether using student-survey data in place of official records data meaningfully biases regression estimates. They motivate their contribution by noting a useful statistical feature of overreporting on bounded variables such as grade point average. Specifically, the misreports will be negatively correlated with the true grade point average, yielding a form of nonclassical measurement error that actually counteracts the bias. The authors connect this observation to reliability ratios used in labor economics, which are simple ways to adjust for attenuation bias, when needed. In two applications, we find that it is unnecessary to correct for the LWE bias because it is so small.     

从固定资产重估看银行资本的提升

分析在国内外会计准则下，通过固定资产重估提升银行资本、缓解监管压力的可行性。根据我国会计准则的相关要求，在固定资产重估方面，目前只能通过投资性房地产重估、固定资产转换与并购重组三种路径提升银行资本，从而达到提升资本充足率的目的，但前两种方法却在一定程度上降低了杠杆率水平，且其市场实施效果也并不乐观。