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排序方式: 共有117条查询结果,搜索用时 12 毫秒
61.
V2X(Vehicle-to-Everything)通信技术是智能交通和智能汽车的支撑技术之一,但目前仍然面临技术路线不明确、政策发展滞后等问题,尚未得到有效推广。系统阐述了V2X技术的内涵和重要作用,重点解析了专用短程通信(Dedicated Short Range Communication,DSRC)和基于蜂窝网络的车辆对外通信(Cellular-V2X,C-V2X)两类V2X主要技术路线的特点和当前问题,总结了国内外相关政策法规、技术标准和产业化活动的最新进展,在此基础上分析了未来V2X技术发展的关键趋势,从而为国家制定V2X相关政策法规、企业明确技术战略方向提供参考。 相似文献
62.
Kevin Schneider Ioannis Skevas Alfons Oude Lansink 《Journal of Agricultural Economics》2021,72(1):224-243
Traditional benchmarking implicitly assumes that decision making units operate in isolation from their peers. For arable production systems in particular, this assumption is unlikely to hold in reality. This paper quantifies spatial spillovers on input‐specific inefficiency using data envelopment analysis and a second‐stage bootstrap truncated regression model. The bootstrap algorithm is extended to allow for the estimation of the parameter of the spatial weight matrix, which captures the proximity between producers. The empirical application concerns Dutch arable farms for which latitudes and longitudes are available. The average inefficiency across years was 3.87% for productive inputs and 2.98% for damage abatement inputs under variable returns to scale. For productive inputs technical inefficiency, statistically significant spillover effects from neighbours’ age and their degree of specialisation depended on the type of the spatial weight matrix used (inverse distance or k‐nearest neighbours). Statistically significant spillover effects of subsidy payments were adverse while statistically significant spillover effects from insurance payments were beneficial. For damage abatement inputs technical inefficiency, statistically significant adverse effects were found for neighbours’ age and subsidy payments and beneficial effects from neighbours’ insurance payments and their degree of specialisation. 相似文献
63.
分析酸液与岩石的化学反应速率规律是碳酸盐岩储层酸化改造技术研究的核心问题。岩石矿物成分是酸岩反应速率的重要影响因素。探索岩石中矿物成分对酸岩反应速率的影响规律,既有助于揭示各类矿物之间竞争反应机理,又可以优化各类型碳酸盐岩改造思路。结合X衍射分析与酸岩反应实验,定量测试了不同矿物成分及含量组成下,酸液与岩石的反应速率。研究表明:①碳酸盐岩各类矿物中方解石、白云石与反应速率呈正比,其他矿物与反应速率呈反比;方解石比白云石反应速率更快。②在灰岩中,当白云石含量为0%~15%与15%~40%时,酸岩反应速率随方解石含量增加升高幅度下降51.4%;当其他矿物含量为0%~15%与15%~30%时,酸岩反应速率随方解石含量增加升高幅度下降61%。在白云岩中,当方解石含量为0%~4%与4%~8%时,酸岩反应速率随白云石含量增加升高幅度上升23%;当其他矿物含量为0%~15%与15%~35%时,酸岩反应速率随白云石含量增加升高幅度减小99%。 相似文献
64.
Carole B. Sox Tena B. Crews Sheryl F. Kline 《Journal of Convention & Event Tourism》2014,15(2):150-169
This study identifies best practices, opportunities, and barriers for marketing and planning virtual and hybrid meetings for Generation X (36 to 49 years old) within the United States. Utilizing a modified Delphi method, a meeting professional panel contributed to four rounds of the Delphi to determine group consent. For virtual meetings, best practice recommendations included having planners collaborate with meeting content designers, including interactive experiences, and including interaction with live experts. For hybrid meetings, best practices identified included real world examples, providing easy to use and convenient technology, and having planners collaborate with meeting content designers. Opportunities and barriers for virtual and hybrid meetings were also identified 相似文献
65.
Are generational differences in work values fact or fiction? Multi-country evidence and implications
Julie Cogin 《International Journal of Human Resource Management》2013,24(11):2268-2294
Few would disagree that human resource initiatives aimed at enhancing employees' quality of life have universal appeal, but the definition of ‘quality of life’ varies by generation. Workplaces are becoming increasingly age diverse and the likelihood that an older employee will report to a younger manager is increasing. Burke's study for the Society for Human Resource Management found that in organizations with 500 or more employees, 58% of human resource management (HRM) professionals reported conflict between younger and older workers, largely due to their different perceptions of work ethics and work–life balance requirements. While cultural and gender diversity have received significant attention in the literature, little attention has been paid to the impact of age diversity on HRM practices. This study attempts to bridge this gap by examining the work values of four generational cohorts – Traditionalists, Baby Boomers, Generation X, and Generation Y – across five countries. Generational differences were found when the effects of culture and life stage were controlled for. Significant differences were observed with Generation Y in particular, presenting creative challenges in accommodating the needs of this cohort while still watching the bottom line. This study establishes the legitimacy of intergenerational differences as an important social categorization variable. 相似文献
66.
从电力物流的定义入手,对电力物流的发展现状进行分析,并阐述了电力物流可持续发展模式的具体实施过程,以及电力物流可持续发展对电力企业发展的影响。 相似文献
67.
68.
This is one of the first studies to analyze the way in which women are portrayed in industrial advertising. It concludes that the use of sex is not a major selling strategy and that, with one exception, women's role in industrial life is accurately reflected. 相似文献
69.
随着技术的发展,市场上的计算机辅助翻译软件琳琅满目、层出不穷。本文先通过概述CAT软件的发展简史对CAT软件进行介绍,之后通过参考他人文献,发现CAT软件的确有提高翻译效率的作用,确定了研究CAT软件的意义。之后通过五方面的对比,对SDL Trados Studio 2014和DéjàVu X3进行了详细分析。研究最后表明,从功能上和价格上综合而言,DéjàVu X3更胜一筹。 相似文献
70.
文章介绍了以北京第一机床厂的X2012A龙门铣床为基础,设计Z3050×16、Z3063 x 20摇臂钻床导轨及端面铣组合机床的过程,重点分析了该组合机床的设计思路、方案选型及设计过程. 相似文献