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电子技术教学,尤其是模拟电子技术的教学,一直是老师们在研究的问题。一直以来,学生们都认为模拟电子技术这门课程是不好学习的。如今电脑已经非常普及,学校也能够为学生上课提供足够的电脑。那么就我们可以使用MULTISIM软件来教授和学习电子类的课程。本应用MULTISIM软件解决了模拟电子技术课程中很重要的带负反馈三极管两级放大电路的反馈分析以及交流参数的计算问题。 相似文献
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建立了涡旋压缩机径向间隙泄漏的数学模型和模拟压缩机热力过程的计算模型。分析了不同的径向间隙量对其泄漏量的影响,以及对压缩机性能的影响。 相似文献
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Carbon dioxide (CO2) emissions are largely driven by fossil fuels. To reduce CO2 emissions in China, it is important to determine influential factors of energy efficiency. This paper introduces a slacks-based measure window analysis approach to evaluate regional dynamic energy efficiency during 2001–2010, and then explores energy efficiency determinants by considering spatial effects, which is conducted based on spatial econometric models. The empirical results show that there exist evident spatial correlations between regional energy efficiencies in China. We find that, there exist evident disparities in cumulative effects of energy efficiency among the eastern, central and western areas. Interestingly, significant energy efficiency spatial spillovers can be clearly found between regions within the western area and across the eastern and western areas. It is found that, energy structure, energy price, railway transportation development and R&D stock are significant at national level. However, energy structure and railway transportation development are insignificant in the central and western areas, while energy price and R&D stock are insignificant in the eastern and central areas, respectively. Industrial structure and urbanization level are found to be insignificant at national level, but industrial structure is significant in the eastern and western areas, and urbanization level is significant in the central and western areas. Surprisingly, industrial structure and urbanization level are found to have positive impacts on energy efficiency in the western area. In addition to regional disparities and local conditions, policies making should take efficiency spatial spillovers into consideration. Several interesting policy implications are achieved. 相似文献
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ABSTRACTThis study takes a micro standpoint to quantitatively verify the extent to which local interactions affect the expansion of dynamic social networks. By reviewing and synthesizing the theoretical literature in this article, we seek to establish a pragmatic analytical framework to capture the underlying functioning of local interactions. It then aims to produce findings on seven distinct marketing campaigns in which the real-world virtual communities offer intact time-series connections. In our considered cases, the firm-to-consumer interactivity plays a pivotal role in social media marketing while the customer-driven influence advances individual information transmission. The significant positive relationships demonstrate features of interactivity within subgroups including reciprocal edges and directed 3-cliques associated with the evolution of the virtual community by electronic word-of-mouth (WOM) of both firm-to-consumer and consumer-to-consumer interactions. More importantly, the attenuation of local interactions to a large extent leads to the cut-off point of the growth of the dynamic social network. 相似文献
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建筑工程施工进度的科学控制研究 总被引:1,自引:0,他引:1
通过对影响施工进度的因素分析,结合多年工作实践,提出了对建筑工程施工进度进行科学控制的有效措施。 相似文献
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边颖 《中国对外贸易(英文版)》2010,(24)
为了按地形地貌和不同立地类型合理配置林种,选择相应的适生树种,使之形成有机联系的绿色综合体的防护林体系,本文以三北防护林建设为切入点,通过规划方案、苗木处理、后期管理等环节论证了如何提高造林成活率的方法. 相似文献
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本文阐述了日益繁荣的商帮经济及其反哺现象,分析了商帮经济对地方经济的反哺机理,指出地方政府应以开放的思维发展商帮经济,并就如何发展商帮经济提出了相应的对策建议. 相似文献