高兼容性低成本无铅材料开发与应用

现今市面上主流的无铅材料多是中Tg和高Tg的产品,高的Tg的预示着高成本;目前全球经济持续低迷,给PCB行业也带来了不小的冲击,迫使各PCB厂家积极寻求低成本高性能的替代材料。CCL供应商推出的PN固化、添加无机填料的普通Tg无铅兼容材料无疑成为一大亮点,成为有效提升客户产品性价比和竞争力的首选。此类型材料除满足一般传统多层板的要求,在HDI板、高多层及厚铜板方面表现同样优秀,文章将逐一说明,以供大家参考和借鉴。     

Functional reliability analysis of Safety Grade Decay Heat Removal System of Indian 500 MWe PFBR

Passive systems are increasingly deployed in nuclear industry with an objective of increasing reliability and safety of operations with reduced cost. Methods for assessing the reliability of thermal-hydraulic passive systems, that is systems with moving working fluid, address the issues in natural buoyancy-driven flow that could result in a failure to meet the design safety limits under accident scenarios. This is referred as design functional reliability. This paper presents the results of functional reliability analysis carried out for the passive Safety Grade Decay Heat Removal System (SGDHRS) of Indian Prototype Fast Breeder Reactor (PFBR). The analysis is carried out based on the overall approach reported in the Reliability Methods for Passive System (RMPS, European Commission) project. Functional failure probability is calculated using Monte-Carlo method and also with method of moments.     

A BIST-DFT technique for DC test of analog modules

Among test techniques for analog circuits, DC test is one of the simplest method for BIST application since easy to integrate test pattern generator and response analyzer are conceivable. Precisely, this paper presents such an investigation for a CMOS operational amplifier that is latter extended to active analog filters. Since the computation of fault coverage is still a controversy question for analog cells, we develop first an evaluation technique for optimizing the tolerance band of the measurements to test. Then, using some DFT solutions we derive single DC pattern and discuss the minimal number of points to test for the detection of defects. A response analyzer is integrated with a Built-in Voltage Sensor (BIVS) and provides directly a logic pass/fail test result. Finally, the extra circuitry introduced by this BIST technique for analog modules does not exceed 5% of the total silicon area of the circuit under test and detects most of the faults.     

密封式铅酸蓄电池化成

作者介绍了密封式铅酸蓄电池极板的化成方法,并指出进行化成时应注意之要点。     

基于Word的质量管理系统应用开发

详细介绍了基于word的质量管理系统的体系结构、功能设计和实现方法。基于Word的质量管理系统通过对Word进行二次开发,使企业在Word中既可以实现对大量非结构化数据和复杂报表的处理,又能够通过网络数据库实现质量信息的存储、共享、分析和再应用,可以推动企业质量管理信息化的发展。     

“轻”的南京明城墙前湖段缺口连接体设计--2015年中国建筑院校境外交流优秀作业方案简介

在“南京明城墙前湖段缺口连接体设计”的概念方案中,采用了“轻”作为方案构思的切入点,从建筑轻的形态、轻的建造、轻的形式,轻与光的共生这几主要个方面来解决明城墙在南京前湖公园内的缺口的问题。     

过去到未来：从中国传统民居园林精髓到绿色建筑更新理念--北京大学“人文学苑”的建筑文化与绿色设计

文章由母校恩师给予苏州民居园林的教育背景的追忆起,以“北京大学人文学苑”设计实践经历为例,依据多年参与节能减排战略行动和绿色建筑实施策略研究的理念,结合实践与理论探讨,提出历史文化生态环境中对传统建筑文化的保护和现实建筑绿色更新的策略,以期为当下绿色建筑落地发展及城市生态环境优化和能源方案优化设计提供建设性的思路,并为弘扬和发展中国传统建筑文化的目标方向,做出积极的坚持不懈的探索。     

基于居家养老理念的传统街道更新设计--以南京龙潭老街更新设计为例

本文介绍了2015年第二届“紫金奖”文化创意设计大赛——建筑及环境艺术设计专项竞赛中,获得职业组三等奖的作品——《龙潭老街张奶奶的一天——基于居家养老理念的传统街道更新设计》。本文以街道适老性更新为切入点,从实施策略、街道更新、建筑设计、生态技术等方面做了分析探讨,对老街更新利用进行了研究,因地制宜地探索街道空间的设计。     

Institutional reform in British construction: partnering and private finance

The British construction industry is presently going through a period of rapid change. A combination of government-led reform initiatives, changes in government procurement strategies, and increasing exposure to international competition is focusing minds and shifting positions. This paper provides an analysis of the institutional aspects of these changes, identifying the root of the problems that the reforms are tackling, and indicating what the prospects of success might be. The paper starts with a historical overview of the evolution of what is here called the professional system, which has dominated the British industry for 150 years. This provides the context for the exploration of the two principal forces for change in the industry - the reform of contractual relations, especially the diffusion of partnering, and the shift of government procurement towards concession contracting in the shape of the Private Finance Initiative. In conclusion, the prospects for success are discussed, noting that the British construction industry is relatively successful in international markets, but that it shares many traditional problems of other sectors of British industry - the predominance of personal capitalism has meant a failure to develop organizational capabilities - the most notable symptom being the continuing reliance on self-organizing gangs of workers for actual production. Le secteur de la construction britannique traverse actuellement une periode de mutation rapide. Des initiatives de reforme lancees par le gouvernement, une evolution de la strategie des approvisionnements gouvernementaux et une plus grande sensibilite a la concurrence internationale occupent les esprits et font bouger les positions. La presente communication analyse les aspects institutionnels de ces changements, localise les racines des problemes auxquels s'attaquent les reformes et indique quelles sont les chances de reussite. Ce document commence par une revue historique de l'evolution de ce que l'on appelle au Royaume-Uni le 'systeme professionnel' qui domine l'industrie britannique depuis 150 ans. On dispose ainsi des elements qui permettent d'explorer les deaux principaux axes du changement qui agissent dans l'industrie britannique de la construction, a savoir la reforme des relations contractuelles (notamment la diffusion du partenariat) et le passage des approvisionnements gouvernementaux a des contrats de concession sous forme d'initiatives financieres privees. En conclusion, l'auteur examine les chance de reussite et note que l'industrie de la construction du Royaume-Uni obtient d'assez bons resultats sur les marches internationaux mais qu'elle partage bon nombre des problemes traditionnels d'autres secteurs industriels de ce pays. La predominance du capitalisme personnel a empeche le developpement des capacites d'organisation, le symptome le plus remarquable etant le fait que l'on continue a s'appuyer sur des groupes auto-organises de travailleurs pour la production proprement dite.     

数控机床控制逻辑的分析与设计

数控机床逻辑是数控机床实现其自身功能必不可少的组成部分，是分析、设计和使用维修数控机床所要考虑的首要问题，本文分析了计算机数控机诃，机床侧控制逻辑的结构及各组成部分的功能，从实际应用的角度出发，提出了分析、设计数控机床控制逻辑的思路、原则和一般性的方法，它包括继电器控制逻辑，可编程接口和ＰＬＣ控制逻辑。