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笔记本电脑中I/O接口的EMC处理
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作者 何勇 《安全与电磁兼容》 2007年第3期53-55,共3页
I/O接口是笔记本电脑EMI超标的主要来源。通过对笔记本电脑周边接口在印制电路板上的布线和布局进行合理规划,以限制噪声信号随意进出I/O接口;同时对接口连接器在I/O口区域做适当接地可优化笔记本电脑的电磁兼容性。
关键词 笔记本电脑 接口 划岛 接地 串扰 耦合 信号完整性
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COMPARATIVE PERSPECTIVE OF THE URBAN PLANNING HISTORY OF QINGDAO: A MODERN PLANNING LAB OF CHINA
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作者 龚清宇 《Transactions of Tianjin University》 EI CAS 1998年第1期92-97,共6页
The purpose of this paper is to explore the significance of Chinese invaded cities in the urban planning history through a comparative view of the modern urban planning theories and methodologies of Qingdao (Tsi... The purpose of this paper is to explore the significance of Chinese invaded cities in the urban planning history through a comparative view of the modern urban planning theories and methodologies of Qingdao (Tsingtau) and those of the developed world from the late 19th century to mid 20th century. After reviewing the German Plan in 1898~1906 and the Japanese Plan in 1941, the paper concludes that the basis grounds of the urban planning practices in Qingdao between 1897~1945 were of the realistic physical planning, rather than of the commonly assumed utopian garden city. Therefore, Qingdao, once being a modern planning lab objectively, helped forward the theories and methodologies of the world′s modern urban planning between the late 19th century and mid 20th century. 展开更多
关键词 modern urban planning lab comparative view invaded cities Qingdao
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ANALYSIS ON LAND-USE CHANGE AND SOCIO-ECONOMIC DRIVING FACTORS IN H AINAN ISLAND DURING 50YEARS FROM 1950TO 1999 被引量:1
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作者 XUXin-liang ZEANGLan 《Chinese Geographical Science》 SCIE CSCD 2002年第3期193-198,共6页
Land-use change is an important part of global change research(IGBP,1990-1992).But the majority of researches focus on the natural dr iving force of land use change.In thi s paper,the authors studied the rela tionship... Land-use change is an important part of global change research(IGBP,1990-1992).But the majority of researches focus on the natural dr iving force of land use change.In thi s paper,the authors studied the rela tionship be-tween socio-economic driving facto rs and land-use change with time series in Hainan Island.Based on the stud y for the evolution of administrative system and policies in Hainan Island and the comprehensive analysis on the socia l economy da-ta and changes of social policies,th e socio-economic policies,human activities and land use of Hainan can be divided into three periods with different ch aracters:period from1950to 1978ch aracterized by the planning economi c system,peri-od from 1978to 1988characterized by the transfer of economic system and a doption of open policy,new stage fro m 1988to 1998with high growing speed.On th e other hand the authors describe the character of the periods and land-use change process affected by socio-economic factors.This paper provides an important method for evaluating the development and changes of Hainan social economy dur ing the 50years from 1950to 1999and f orecasting the development of Hainan so-cial economy in future. 展开更多
关键词 socio-economic development land-use change planning economy reform andopen-up economic system
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