社会资本对居民生活垃圾分类行为的影响机理分析

社会资本与环境保护合作行为的逻辑关系已经成为环境管理的一个重要研究方向。基于219户城镇居民调查数据的实证研究发现,除了年龄、受教育年限和中共党员身份外,以社会网络、社会规范和社会信任为要素的社会资本,对提高居民生活垃圾分类水平有显著的正向影响。具体而言,社会网络能够降低居民机会主义和“搭便车”的行为倾向;社会规范能够提高居民行为的可预测性,增强居民投资环境保护集体行动的信心;社会信任则通过降低交易成本,促进居民生活垃圾分类的自主合作行为。为从源头上化解我国生态环境管理面临的“垃圾围城”困境,政府应积极促进居民间的网络互动,完善互惠共享的社会规范,提升居民间的普遍信任,同时加大对生活垃圾分类知识和技巧的宣传力度、发挥党员在遵守社会规范中的带头作用,通过社会资本发展促进公众的自主环境保护合作行为。     

步进电机细分驱动系统设计

为了提高步进电机的运行精度,消除或减小振动现象,文章基于细分驱动技术,以单片机ATmega128为核心,应用恒流斩波PWM发生电路和H桥功率驱动电路设计了步进电机的驱动系统。系统控制参数通过上位机设定,以串口通信传给单片机。实验结果表明：电机运行平稳,振动噪音小,转矩大,精度高,系统具有良好的应用前景。     

基于索洛模型的区域经济增长驱动因素实证研究

在供给侧改革背景下,区域经济增长的驱动因素显著影响着区域经济的高质量和可持续发展。以索洛增长模型为基本框架,利用2003～2017年安徽省经济发展相关数据开展实证研究,测算资金投入、劳动力投入、技术进步各因素对经济增长的贡献率;同时对模型进行扩展,研究安徽省经济增长的长期驱动力量,对现期和远期的动能转换加以阐述。研究认为,现阶段资金投入仍然是安徽省经济产出的主要驱动因素,劳动力投入的经济推动效应相对较小,技术进步的驱动力量逐步提升,安徽省远期经济发展将主要依赖于技术创新驱动。安徽省应注重科技创新,进行产业结构优化调整,将技术因素融于资金、劳动供给侧,全面深化以技术为主的供给侧改革,加快经济增长动力转型。     

Older Drivers Retiring From the Road: An Application of the Selection,Optimization, and Compensation Model

Purpose: This study uses the selection, optimization, and compensation (SOC) model to compare older adults who have given up driving, those who still drive, and those who drive less to identify differences in the three groups. Design and Methods: This cross-sectional study of 281 older adults is part of the Naturally Occurring Retirement Community Demonstration Project. Study participants completed interviews that included questions on demographics, health and functioning, mental health, social support, and current levels of engagement in activities including current driving status. Results: Data suggest that driving retirement is a process and that a substantial number of people are in the transitional stage, where they are less functional than those who still drive and more similar to those who have retired from the road. Implications: Given the similarity of those who drive less to those who have given up driving, front-line professionals and policy makers must work together to ease the transition to driving retirement for those without adequate ability to effectively compensate for their inability to continue to drive safely.     

吉登斯的现代性思想"群像"

吉登斯建构了一个完整的现代性思想体系。在吉登斯那里,断裂性是现代性的首要特征。资本主义、工业主义、监督机器与军事力量是现代性的制度性维度。而时空分离、脱域机制和反思性监控是现代性的动力。现代性的高度全球化衍生出了世界资本主义经济体系、民族国家体系、世界军事秩序和国际劳动分工体系。现代性扩张的后果是把人类带入了一个风险社会,而走出风险社会的乌托邦现实主义导向性策略是消除贫困、恢复环境、反对专权以及减少社会生活中的武力与暴力。     

摆动滚子从动件圆柱凸轮解析设计式的推导

本文较为全面系统地推导了摆动滚子从动件圆柱凸轮的廓线、压力角及廓线曲率半径方程,并讨论了该种凸轮机构在各种运转情况下与之相适用的方程。这些方程可用于凸轮廓线的计算机辅助设计。     

印度高等教育规模扩充的驱动因素分析

高等教育规模扩充受多重因素的驱动。在1950—1970年的20年间，印度的高等教育经历了大规模的扩充，持续扩充背后的驱动因素有哪些？本文从不同的角度出发，分析了驱动印度高等教育规模扩充的深层因素。     

基于负反馈理论的半导体激光器驱动器的设计与仿真实验研究

本文设计出了一种实用的大功率半导体激光器驱动器,它可提供恒流和恒功率两种驱动方式,采用深度负反馈控制原理实现稳定控制。重点介绍了恒流驱动电路原理,并应用Multisim7进行软件仿真实验研究。在此基础上还设计了保护电路。     

诗人的求真精神与初期白话新诗运动

初期白话新诗运动的兴起与新诗的倡导者、尝试者们的求真精神密切相关。"求真"精神就是在创作中融入诗人自身真实的人生体验,在诗歌中注入时代精神。求真精神是初期白话新诗运动的重要动力和艺术追求之一。理解了这一点,能较客观地分析白话新诗所呈现出来的内容和形式上的独特性;把握白话新诗与中国古典诗词的联系以及正确地看待外国诗歌对中国新诗的影响。     

Do Drivers of Small Cars Take Less Risk in Everyday Driving?

Previously reported observed data on risky everyday driving are brought together and reanalyzed in order to focus on the relation between risky driving and the size of the car being driven, as indicated by car mass. The measures of risky driving include separation between vehicles in heavy freeway traffic and speed on a two lane road. Observed seat belt use provides a third measure of driver risk. Confounding effects arising from the observed association between car mass and driver age are taken into account by segmenting the data into three driver age groups. Driver risk taking is found to increase with increasing car mass for each of these three aspects of everyday driving. The implications of these results with respect to driver fatality rates are discussed in terms of a simple model relating observed risky driving to the likelihood of involvement in a severe crash.