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991.
992.
Effect of Parental Migration on the Academic Performance of Left‐behind Middle School Students in Rural China 下载免费PDF全文
China's rapid development and urbanization over the past 30 years have caused large numbers of rural residents to migrate to urban areas in search of work. This has created a generation of children who remain behind in rural areas when their parents migrate for work. Previous research has found mixed impacts of parental migration on the educational achievement of left‐behind children (LBC), perhaps because of methodological deficiencies and lack of recognition of the heterogeneity of this population of children. Our study attempts to examine the impact of six types of parental migration on the academic achievement of a rural junior high school sample. Our study uses a panel of 7148 junior high school students to implement a difference‐in‐difference analysis and finds that parental migration has a negative and significant impact on the academic achievement of junior high school students. Our study suggests that the Chinese Government should implement measures to dismantle barriers to the human capital accumulation of LBC to ensure sustainable economic growth and human capital development in China. 相似文献
993.
基于DEA方法的中国农业水资源利用效率研究 总被引:1,自引:0,他引:1
李明璗 《中国农业资源与区划》2017,38(9):106-114
[目的]以我国各省市2008~2015年农业水资源利用效率为研究对象,探究我国农业水资源利用效率的规律与特点,并基于此提出促进农业水资源合理利用的建议。[方法]主要采用了文献研究法、统计分析法和数据包络分析(DEA)法。通过文献搜集我国各省市2008~2015年与农业水资源利用相关的数据,构建DEA模型,对我国近年来农业水资源利用效率进行评价。[结果]2008~2015年,我国农业水资源利用效率在0.80上下浮动。各省市农业水资源利用效率随时间变化趋势不同。甘肃和上海的农业水资源利用效率涨幅最大,年增长率分别为4.39%和2.74%;山西、江西以及陕西省的农业水资源利用效率整体趋于下降;浙江、湖南以及陕西和新疆的农业水资源利用效率有先上升后下降的特点,表现出明显的波动。此外,农业水资源利用效率区域分化明显。东部地区农业水资源利用效率一般高于0.80,中部地区位于0.60~0.80,西部地区农业水资源利用效率一般低于0.60。[结论]2008~2015年,我国农业水资源利用效率表现出一定的时间差异性和空间差异性。时间差异性:我国农业水资源利用效率一直处于较高水平并呈现逐年增长趋势,不同省份的农业水资源利用效率随时间变动趋势各异。空间差异性:东部地区农业水资源利用效率最高,中东部地区农业水资源利用效率甚至达到了最优,中部地区其次,西部省区农业水资源利用效率最低。农业水资源利用效率受当地政策、经济发展水平、农业发展水平、水资源总量和人口压力等因素影响严重,今后应针对不同地区采取不同措施解决实际问题。 相似文献
994.
Our main goal is to re‐examine and extend certain results from the papers by Galluccio et al. and Pietersz and van Regenmortel. We establish several results providing alternate necessary and sufficient conditions for admissibility of a family of forward swaps, that is, the property that it is supported by a (positive) family of bonds associated with the underlying tenor structure. We also derive the generic expression for the joint dynamics of a family of forward swap rates under a single probability measure and we show that these dynamics are uniquely determined by a selection of volatility processes with respect to the set of driving martingales. 相似文献
995.
我国古代传统的会计教育是以账房师傅手把手教徒弟,一代传一代的方式进行的,且每个人记账的方式都大有不同,直至晚清之前,中国的会计教育是不成系统的。随着西方会计科学的传入和我国第一批留学归来的会计学者的推广,晚清时期,学堂的商科会计教育已经具备现代会计教育的雏形。在改良中式账簿与完全引进西方会计科学的激烈讨论中,"中华民国"时期的会计教育正式走向正轨,也可以说,中国系统的现代意义上的会计教育是从中华民国开始的,而民国早期与后期又有不同。本文将根据中国会计教育发展的时间轴线,对中国古代会计教育与晚清商科会计教育作一梳理,并着重研究"中华民国"时期的会计教育,并从官办会计教育与民间会计教育两个方面来考量。 相似文献
996.
997.
目的是建立中试生产葡萄酒中白藜芦醇的含量测定方法。方法系采用高效液相色谱法测定了白藜芦醇的含量,C_(18)色谱柱(250 mm×4.6 mm,5μm),流动相为甲醇∶水=40∶60,流速1mL/min,检测波长306 nm,柱温30℃。结果显示白藜芦醇与样品中其他组分分离效果较好,白藜芦醇在0.271 3~4.340 0μg范围具有良好线性关系,相关系数r=0.999 9;平均回收率为94.6%,RSD为1.97%(n=6)。结论为采用此法准确可靠,可用于该葡萄酒的质量控制。 相似文献
998.
Douglas R. May Cuifang Li Jennifer Mencl Ching-Chu Huang 《Journal of Business Ethics》2014,121(4):651-669
This research on the ethics of meaningful work examined how types of job-related harm (physical, economic, emotional, and cognitive) and their magnitude of consequences (MOC, low, high) influenced components of ethical decision-making (moral recognition, moral evaluations, and moral intentions). The research also investigated the moderating effects of individual differences (experience with carpal tunnel syndrome, experience with layoffs, ability to read others’ emotions, and intrinsic motivation orientation [IMO]) on the relation between the MOC and the ethical decision-making elements for each type of harm. Using a sample of 185 Chinese professionals, a between-subjects, fully crossed experimental scenario design revealed that physical and economic job-related harm were recognized as moral issues to a greater extent than cognitive or emotional harm. Second, physical job-related harm stimulated a higher level of moral evaluations than economic and cognitive harm. Third, individuals intended to act ethically when MOC was high versus low. Finally, experience with layoffs and IMO helped explain the relations between MOC and moral evaluations for economic and cognitive job-related harm, respectively. Implications for research and management are discussed. 相似文献
999.
冯莉 《东北财经大学学报》2021,(6):88-96
在网络谣言的治理体系中政府规制扮演着重要的角色,尤其在新冠肺炎疫情的背景下,这种重要作用更加得以凸显.基于网络谣言已经逸出言论自由的范围和保障公共利益的需要,政府规制网络谣言具有正当性基础.但是,能够纳入政府规制的网络谣言在范围上并不能与传统的谣言相等同,前提须为具有可规范因素.通过梳理理论界及法律文本中关于网络谣言的认知与规定,本文发现网络谣言的范围一般包括虚假的、无事实根据的、非官方权威来源的和未经证实的信息.由于"非官方权威来源的信息"与"未经证实的信息"具有真伪不确定性,不宜直接纳入政府规制的网络谣言范围,而需要进一步廓清其法律边界.以这种不确定的信息作为规制的对象,政府适宜采取谦抑性态度,在符合法律保留原则、比例原则和正当程序原则的基础上,综合考量信息的发布主体、目的、受众范围、发布者与传播者的主观感受、社会危害程度等因素后审慎介入. 相似文献
1000.
This study investigates the moderating effects of a firm's network embeddedness and a partner's transactional specific investments (TSIs) on relationships between the firm's TSIs and its partner's strong- and weak-form opportunism, and compares the efficiency among these moderator variables. The regression results suggest that (1) a firm's TSIs are positively related to partner's opportunism when network embeddedness and the partner's TSIs are relatively low; but (2) a firm's TSIs are negatively related to partner's opportunism when network embeddedness and the partner's TSIs are relatively high. Furthermore (3) network embeddedness is more effective in inhibiting partner's weak-form opportunism than in inhibiting strong-form opportunism resulting from the firm's TSIs. Finally (4) with regard to the relationship between TSIs and weak-form opportunism, the negative moderating effect of network embeddedness is greater than the negative moderating effect of partner's TSIs. This study explains reasons why conflicting views exist about the relationship between TSIs and partner's opportunism, reveals the differences in the moderating effects of network embeddedness and partner's TSIs, and makes new contributions to both transaction cost theory and embeddedness literature. It also provides, for firms involved in TSIs in a buyer–supplier relationship, insightful managerial suggestions about ways to reduce their partner's varying forms of opportunism. 相似文献