Tests for random time effects and spatial error correlation in panel regression models

We consider a panel model with spatial autocorrelation and heterogeneity across time. Various Lagrange multiplier and likelihood ratio test statistics are developed for testing time effects and spatial effects, jointly, marginally or conditionally. Limiting null distributions of the tests are derived. Size and power performances of the proposed tests are compared by a Monte-Carlo experiment.     

Reducing bias of the maximum-likelihood estimation for the truncated Pareto distribution

The Pareto distribution is an important distribution in statistics, which has been widely used in finance, physics, hydrology, geology, astronomy, and so on. Even though the parameter estimation for the Pareto distribution has been well established in the literature, the estimation problem for the truncated Pareto distribution becomes complex. This article investigates the bias and mean-squared error of the maximum-likelihood estimation for the truncated Pareto distribution, and some useful results are obtained.     

Mobile use,personal values,and connectedness with civic life

This study aims to examine whether and how mobile communication enables citizens to translate their value orientations into their connectedness to the civic life. Specifically, we probe the indirect process in which different types of personal values predict key dimensions of engagement with civic affairs through patterns of mobile phone use. We show that individualism is indirectly associated with engagement with civic affairs through informational mobile use, whereas the link between collectivism and community involvement is positively intervened by relational mobile use. Additionally, socio-tropic empathy yields indirect relationships with civic engagement through informational mobile use. Implications of these findings are discussed.     

劳务派遣法律规制与实践背离的法社会学探究

通过对劳务派遣法律规制与实践之间的关系考察发现:法律规制是一回事,劳动实践又是另外一回事.在劳动实践中通行并发挥作用的规则,并不完全等同于书本上的劳动法律.如何从理论上理解并解释该现象以及如何分析其成因并提出有建设性意义的对策是我们关注并解决的问题.从法律社会学的角度,运用"行动中的法"的理论分析了劳务派遣法律规制的修改、实施问题,揭示了劳务派遣法律规制表达与实践之间的背离现象并予以理论化和类型化,进而从立法和法律实施两个角度分析了产生这一现象的原因,即劳务派遣法律规制的不足,影响了法律规制的实施效果;弱化的行政执法,造成了法律规制效果的低下;"双轨制"用工制约了法律规制实施效果,三方之交易行为规避法律条款,架空了法律规制.     

固相萃取净化-液相色谱法测定婴幼儿配方奶粉中核苷酸

建立了固相萃取净化样品,液相色谱法测定婴幼儿配方奶粉中核苷酸含量的方法。样品用水溶解后10%乙酸溶液沉淀蛋白质,用Strata-X固相萃取柱采用通过的方式净化样品,流动相为0.1M磷酸缓冲溶液(PH5.2-5.3)和乙腈梯度洗脱,Gemimi C18250×4.6mm,5μm色谱柱分离,外标法定量。该方法具有操作简单、容易掌握、重现性好等特点。经测试5种核苷酸线性良好,相关性均在0.999以上;各组分回收率均在91%以上,RSD%均在3.5%以下。能够满足乳品企业常规检测的需求。     

Relationship of sleep quality and attention deficit hyperactivity disorder symptoms with quality of life in college students

Abstract

Objective: Attention deficit hyperactivity disorder (ADHD) negatively influences various aspects of life such as social relations, adaptive skills, and occupation. In addition, many university students experience sleep problems, academic failure, and low quality of life (QOL). We investigated the relationship among ADHD symptoms, sleep quality, and QOL of college students, and identified the factors related to their QOL. Participants and Methods: Using a survey questionnaire, data were collected from 195 students from March–May 2017. Results: QOL of students was related to ADHD symptoms and sleep quality. Factors significantly associated with better QOL were fewer ADHD symptoms, good sleep quality, male sex, high academic performance, and high economic status. The explanatory power of these variables on QOL was 32.0%. Conclusion: To improve the QOL of college students, a multifaceted approach that includes assessment of ADHD symptoms and sleep quality is needed.     

浙江省城市绿色技术创新效率评价及影响因素分析

基于网络DEA模型和Malmquist指数模型，利用浙江省11个地级市的2011-2020年的数据，以降维后的污染指数为非期望产出对绿色技术创新效率进行测度和分析。发现:浙江各市总体上成果转化阶段的效率优于研发阶段，城市间发展差异较大；整体TFP指数均值为1.121，其提升主要源自技术进步；城镇化水平、产业结构优化、对外开放、政府干预和研发强度对绿色技术创新效率有促进作用，但经济发展水平与绿色技术创新效率的U型关系不显著。     

Does Remittance Outflow Stimulate or Retard Economic Growth?

This article evaluates the association between remittance outflow (RMO) and economic growth in the Gulf Cooperation Council (GCC) countries. The results of this evaluation indicate that RMO Granger creates gross domestic product (GDP) per capita in three countries, namely, Bahrain, Oman and Saudi Arabia. Similarly, the results for causality from GDP per capita to RMO are significant for four countries, namely, Bahrain, Kuwait, Qatar, and Saudi Arabia. The findings differ from those of the household consumption model, stating that higher RMO will decrease economic activity. GDP per capita is the main determinant of RMO, suggesting that economic growth promises and encourages continuous RMO and vice versa. The adverse impact of RMO can be minimized by encouraging the local population to be productive in the private sector, as local productivity will reduce the huge influx of foreign workers and provide valuable local investment opportunities to lessen the amount being remitted.     

论华人文学中身份焦虑之成因

关于"身份"的焦虑困扰着一代代在美华人,曾使之失语、沉默,甚至形成了"沉默的中国人"的群体形象。美国华人文学多层面展现了几代华人的身份焦虑及其复杂成因,涉及历史变革、文化冲突、语言差异、生存困境、情感归属等诸多因素。这已成为美华作家持续关注与表现的一个重要文学主题,它道出了被过滤的历史真相以及人们为了获得生存权利所面对的无奈选择,作为对"单一化"呈现的反抗,打破了西方人眼中源于民族劣根性与缺陷性的华人身份形象。同时,美华文学也增进了人们对于身份焦虑本身的认识,有利于更好地面对这一问题并最终完成身份建构。     

基于元网络分析的重大基础设施建设项目风险评估框架与实证

重大基础设施项目具有战略性、集成性、复杂性等特征，项目容易受到多种风险因素的综合影响，导致项目目标的偏离。现有风险评估与风险决策的方法缺乏对于风险因素、风险事件之间关联的分析。为了实现重大基础设施建设项目综合系统的风险评估，本文采用元网络分析方法，构建项目目标、风险事件和风险因素的交互模型，揭示重大基础设施风险事件发生机制的黑箱过程。风险评估过程中，通过多个网络叠加运算分析每个风险因素对于各种风险事件以及项目各目标的影响情况，改进了以往仅对风险因素单一影响程度的风险评估方法。同时，本研究选择我国某河流水电站过坝运输项目方案比选的风险评估过程验证方法的适用性。