Suppression of tin whisker formation on fine pitch connectors by surface roughening

In the electronics industry, lead-free solder processes such as the terminal plating of electronic components, fine pitch connectors, and flexible printed circuits (FPCs) are invariably hampered by the serious problem of tin whisker formation. Here, a new and simple method, the JVC Micro Island (JMI) process, is proposed for the prevention of tin whisker formation in fine pitch connectors. Briefly, the base copper terminal was acid etched to afford a roughened surface, which was then tin plated. The contact test with Knoop indentation proved the effectiveness of the present process. The maximum length of the as-formed tin whiskers was less than 50 μm. The solderability of the JMI FPCs was not influenced by the present process. Thus, the new JMI process is shown to have a great advantage for the prevention of tin whisker formation in fine pitch connectors.     

消除“信息孤岛”——电子政务总体框架和顶层设计

电子政务中出现的“信息孤岛”是我国电子政务系统的一个很大的缺陷，从分析这个缺陷形成的原因出发，阐述电子政务总体框架设计和顶层设计，确认总体框架和顶层设计对于电子政务的发展是极其重要的。     

城市生态性地区概念规划探讨——以南京江心洲概念规划为例

南京江心洲概念规划针对基地"城市生态性地区"的属性特征,把整个岛屿作为一个受到控制和保护的绿色基底,把人工建设区域作为斑块散布在生态基底之上.通过对结构的优化,经历了"‘糖葫芦'-‘串珠'-‘枝叶'"三种结构的改进之后,规划最终确立"枝叶"状的结构.     

光伏发电系统中逆变器的研究与应用

光伏并网发电系统由太阳电池组件、并网逆变器、计量装置及配电系统组成,太阳能能量通过光伏阵列产生的是直流电能,需要通过逆变器把直流电转换成与电网同频率、同相位的交流电才能并到电网。并网逆变器作为光伏阵列与电网的接口装置,起着关键的作用。随着光伏发电系统的发展,并网发电系统中使用的逆变器得到了越来越多的关注。本文从阐述并网...     

鼓浪屿的产业与空间对策——文化创意产业激活鼓浪屿的复兴之路

鼓浪屿以"国家重点风景名胜区"为唯一的发展定位,忽略其文化旅游景区与社区功能的双重属性,导致鼓浪屿"人文内涵的消褪"。本文认为鼓浪屿产业的缺失与失衡是不宜居的重要原因之一,提出文化创意产业推动"人文社区的重构",激活鼓浪屿的复兴之路,重新塑造鼓浪屿的新形象和新品牌"文化圣地,艺术殿堂"。     

China's Eco-Cities as Variegated1 Urban Sustainability: Dongtan Eco-City and Chongming Eco-Island

Proliferating environmental sustainability policy frameworks suggest that sustainability and economic competitiveness are essentially interdependent and mutually enhancing. Under these policy discourses, cities are designated as strategic geographical locales for fulfilling the green capitalist goal of reconciling the contradictions between the environment and development that have long bedeviled capitalism. While most urban sustainability agendas are crafted based on the experience of post-industrial countries, the promise of green capitalism and sustainability faces different challenges where industrial production still dominates the economy. However, research on whether and how urban sustainability policies are geographically variegated is still sparse, particularly beyond western (post)industrial capitalism. Examining the Dongtan eco-city project and the associated Chongming eco-island project in Shanghai, we interrogate how sustainability is imagined and practiced on the ground within the distinctive Chinese context. The meanings of sustainability in Dongtan and Chongming reflect the context of Chinese urbanization in the Shanghai area. Both Dongtan and Chongming seek to develop green technologies as a way to resolve the dilemma of being caught between urbanization and agriculture. This approach is also shaped by Chongming's island geography as enabling a self-sufficient development trajectory, and its desire to attract a cosmopolitan population. Through these place-specific contexts, the ecology and economy of Dongtan and Chongming become intertwined, producing and reproducing a variegated form of urban sustainability, and of “green capitalism.”     

Museum Development in the Gulf: Narrative and Architecture

How might interpretations of the past be informing the culture of tomorrow? Sarina Wakefield , a specialist in heritage and museum development in the Middle East, provides an overview of the form and function of contemporary museums in Qatar, Bahrain, Saudi Arabia and the UAE. In so doing, she explores how institutions are drawing on locally specific heritage and cultural objects to develop distinctive identities for an international audience.     

ACP1000核电常规岛主给水泵内部流动数值模拟与优化

以第三代核电ACP1000常规岛主给水泵为研究对象,建立双吸叶轮流场三维模型,基于CFD方法,采用标准k-ε湍流模型和可升级壁面函数法对其进行三维定常湍流计算。以叶轮前盖板流线为优化参数,基于Bezier函数型流线设计方法对叶轮前盖板提出了优化设计方案。通过比较叶轮内流场增压特性以及水力性能曲线,结果表明,优化后的方案具有高扬程高效率的特点,设计参数满足ACP1000核电机组常规岛主给水泵性能要求。     

福州市南台岛人口容量研究

本文在分析福州市南台岛人口现状特征以及相关规划人口规模预测结果的基础上,从居住建筑容量、公共服务设施服务能力、市政公用设施支撑能力、道路交通承载能力、绿化环境质量等多视角研究南台岛的合理人口容量,以为南台岛控制开发强度、完善设施配套、提升综合环境品质、实现发展目标等提供参考。     

崇明智慧生态岛规划与建构

在信息通信技术（ICT）快速发展的背景下,信息时代的城市具有新的发展特征,智慧技术被认为是城市未来规划的重要手段和对象,在智慧技术支撑下的可持续生态城市系统的建构显得尤为重要.崇明岛作为未来生态城市发展的示范地区,即将面临城镇化的进一步发展,通过对其智慧生态发展的规划与建构,对未来城市智慧化和生态化导向的发展进行探索.