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采用工件加振方式的微细超声加工特性的研究 被引量:16
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作者 杨晓辉 增泽隆久 《电加工与模具》 2000年第3期29-32,共4页
通过以WEDG放电加工手段制作微细超声加工用工具 ,在采用工件加振方式的微细超声加工机上对碳酸玻璃、半导体硅等硬脆材料试件进行微孔加工的实验 ,来探讨在某一特定加工条件下工具材料、工件材料、工件的振幅、加工静载荷、磨料悬浮液... 通过以WEDG放电加工手段制作微细超声加工用工具 ,在采用工件加振方式的微细超声加工机上对碳酸玻璃、半导体硅等硬脆材料试件进行微孔加工的实验 ,来探讨在某一特定加工条件下工具材料、工件材料、工件的振幅、加工静载荷、磨料悬浮液浓度、工具长度及工件尺寸等重要因素对加工速度、工具损耗率的影响 ,为微细超声加工技术的实用化提供参考依据。 展开更多
关键词 微细加工 超声加工 硬脆材料 工件加振方式
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The Implications of Population Decline and Fiscal Austerity on Public Nature:Insights From the Evolution of Urban Park Management System in Japan
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作者 Xizi XU Fumihiko SETA +1 位作者 Noriko AKITA Kai ZHOU 《景观设计学(中英文)》 CSCD 2024年第4期8-25,共18页
Facing challenges of population decline and fiscal austerity,Japan has implemented a series of initiatives to promote public-private partnerships(PPP)to ensure the sustainability of urban parks and revitalize urban sp... Facing challenges of population decline and fiscal austerity,Japan has implemented a series of initiatives to promote public-private partnerships(PPP)to ensure the sustainability of urban parks and revitalize urban spaces.These initiatives,while alleviating the government’s financial burdens on parks,have also raised concerns about the potential erosion of publicness and public interests resulted from the commercialization of public assets.This paper reviews the evolution of Japan’s urban park management system after World War II—including three phases of being purely public goods,initiating marketization,and diversifying management entities.The functions of parks have continuously enriched,and the construction,management,and operational modes have shifted from government-led towards multi-stakeholder participation,along with expanded funding sources.By examining the PPP types,driving forces,implementation mechanisms and challenges in urban park management,this paper points out that,in different eras and social contexts,the Japanese government has kept adjusting its role to maximize public interests.This has proactively updated the implications of publicness in infrastructure like urban parks,from a post-war opposite of publicness versus privateness on ownership,to the participation of private capital for a higher efficiency,and finally to a community for a stronger regional competitiveness.The reforms of urban park management system in Japan offer significant lessons and insights for urban infrastructure management in other countries and regions. 展开更多
关键词 Publicness Landscape Justice Public-Private Partnership “Private Finance Initiative”System for Parks Urban Parks Management System Urban Infrastructure
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