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一种自下向顶的单片机编程教学方法 被引量:1
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作者 谢少伟 《绍兴文理学院学报》 2008年第8期41-45,共5页
文章以单片机音乐播放程序为例,介绍一种以最简化核心程序为起点,逐步增加程序功能与难度的自下向顶单片机编程教学方法,尤其适合于高职高专学生单片机课程设计与毕业设计等编程教学.
关键词 MCS-51单片机 音乐发声 编程教学 自下向顶
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Empirical Study on Driving Factors and Countermeasures of New-type Urbanization in China
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作者 Hui ZHONG 《International Journal of Technology Management》 2013年第9期138-141,共4页
The ultimate goal of new-type urbanization is to integrate urban and rural areas, which is influenced by various factors such as urban and rural populations, technology, capital, resources, etc. Accordingly, the need ... The ultimate goal of new-type urbanization is to integrate urban and rural areas, which is influenced by various factors such as urban and rural populations, technology, capital, resources, etc. Accordingly, the need and importance of economic, social, cultural, and ecological factors ought to be analyzed to promote new-type urbanization. In this paper, we first describe the driving factors of new-type urbanization, and then we conduct an empirical study on the driving factors of new-type urbanization and analyze the data with Logit model. Finally, it is put forward that more effort should be made to accelerate new-type urbanization in such aspects as top-down design, government support, social interaction, etc. 展开更多
关键词 driving factors new-type urbanization empirical study
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A comparison of two kinds of eastward-moving mesoscale vortices during the mei-yu period of 2010 被引量:22
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作者 FU ShenMing YU Fei +1 位作者 WANG DongHai XIA RuDi 《Science China Earth Sciences》 SCIE EI CAS 2013年第2期282-300,共19页
During the mei-yu period,the east edge of the Tibetan Plateau and the Dabie Mountain are two main sources of eastward-moving mesoscale vortices along the mei-yu front(MYF).In this study,an eastward-moving southwest vo... During the mei-yu period,the east edge of the Tibetan Plateau and the Dabie Mountain are two main sources of eastward-moving mesoscale vortices along the mei-yu front(MYF).In this study,an eastward-moving southwest vortex(SWV) and an eastward-moving Dabie vortex(DBV) during the mei-yu period of 2010 have been investigated to clarify the main similarities and differences between them.The synoptic analyses reveal that the SWV and DBV were both located at the lower troposphere;however,the SWV developed in a "from top down" trend,whereas the DBV developed in an opposite way.There were obvious surface closed low centers corresponding to the DBV during its life span,whereas for the SWV,the closed low center only appeared at the mature stage.Cold and warm air intersected intensely after the formation of both the vortices,and the cold advection in the SWV case was stronger than that in the DBV case,whereas the warm advection in the DBV case was more intense than that in the SWV case.The Bay of Bengal and the South China Sea were main moisture sources for the SWV,whereas for the DBV,in addition to the above two moisture sources,the East China Sea was also an important moisture source.The vorticity budget indicates that the convergence was the most important common factor conducive to the formation,development,and maintenance of the SWV and DBV,whereas the conversion from the vertical vorticity to the horizontal one(tilting) was the most important common factor caused the dissipation of both of the vortices.The kinetic energy(KE) budget reveals that the KE generation by the rotational wind was the dominant factor for the enhancement of KE associated with the SWV,whereas for the DBV,the KE transport by the rotational wind was more important than the KE generation.The KE associated with the SWV and the DBV weakened with different mechanisms during the decaying stage.Furthermore,the characteristics of baroclinic and barotropic energy conversions during the life spans of both vortices indicate that the SWV and DBV both belong to the kind of subtropical mesoscale vortices. 展开更多
关键词 southwest vortex MEI-YU VORTICITY kinetic energy baroclinic energy conversion barotropic energy conversion
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