��������������Ŀ���ݽǶȱȽ�UNIMARC��USMARC

从连续出版物书目数据的角度介绍ＵＮＩＭＡＲＣ和ＵＳＭＡＲＣ的建立、目的、记录结构和字段设置等内容;通过详细比较,阐述两者在产生背影、目的、著录标准、内容字段设置等方面的主要差别,指出两种ＭＡＲＣ的主要优缺点。     

急倾斜特厚煤层伪斜斜切小段落小条带采煤方法研究

通过巷道布置将水平分层采煤法、仓储采煤法及斜坡后退采煤法结合起来,形成一种适合于急倾斜特厚煤层的采煤方法.     

基于资产选择的投资组合模型与中国股市实证检验

Lars-Lasso回归算法是近年来统计选元的一个新兴方法.针对资产数量众多的投资市场,本文将Lars-Lasso方法运用到资产配置的第一步资产选择中,针对已选择的小数量资产进行资产组合配置.对中国沪深股市股票进行实证分析.结果证明,在Lasso选元下得到的投资组合总体表现优于市场指数.     

绞股蓝皂甙对人体的抗疲劳作用

结合运动训练，就绞股蓝皂甙（ＧＰｓ）对人体的抗疲劳作用进行了研究。实验观察到ＧＰｓ具有以下功能：（１）降低递增负荷运动后１０ｍｉｎ时的血乳酸水平；（２）提高１０ｓ平均无氧功率；（３）防止血清酮／皮质醇比值降低；（４）提高血清ＩｇＧ水平。     

危险品码头智能监控预警系统总体设计

为解决传统视频监控预警系统移植到危险品码头会存在监管不力,难以快速有效地从海量视频中筛选出有效信息的问题,引入智能视频识别技术,设计危险品码头智能监控预警系统.结合码头危险品作业监管的基本现状,分析危险品在码头作业期间各个环节的特点,设计系统主要功能,实现危险品作业全天24 h监控、自动目标检测、智能风险识别、态势评估分级、预警信息发布,辅助监管人员进行决策.     

Exploring the contributions of job resources,job demands,and job self-efficacy to STEM teachers' job satisfaction: A commonality analysis

This study aims to examine how job resources, demands, and self-efficacy affect American STEM teachers' job satisfaction by analyzing the US TALIS 2018 data. Multiple regression and commonality analysis were used to analyze factors' significant contributions and their detailed real unique and common contributions to STEM teachers' job satisfaction. The results show that the final model explains 29.6% of the variances of STEM teachers' job satisfaction. The commonality analysis further showed that job resources, job demands, and job self-efficacy explained 23.5%, 8.6%, and 8.0% of variances of job satisfaction, respectively. However, these factor sets uniquely contributed 15.9%, 2.9%, and 2.1% of the variance, separately. This study confirms the validity of the revised job demands−resources model for STEM teachers' job satisfaction. Furthermore, the commonality analysis reveals the unique and independent contributions of job demands, resources, and self-efficacy to job satisfaction. Results from the research identified the significance of job resources contributing to the improvement of STEM teachers' job satisfaction.     

水下观探测装备核供能方案的思考

海洋事关国家战略利益，事关全人类共同命运，急需发展全方位、多维度地观测、探测海洋的各类装备。文章简要介绍了核能应用于水下观探测装备供能的2种技术途径及各类热电转换技术，定性归纳了核供能对各类型装备的适用性，分析了其中的核安全相关问题，并建议重点支持放射性同位素制备与分离技术研究与平台建设、个性化特种反应堆研发与共性平台建设、热电转换技术研究及相关核安全问题研究。