A highly-structured interpreter for a SNOBOL4 subset

A highly-structured and conceptually simple processor, written in Algol 68, for a basic but useful subset of SNOBOL4 is presented. It provides a significant, large-scale demonstration of a particular methodology for constructing ‘master’, machine-independent implementations of programming languages. The processor is closely related to a formal operational definition of the SNOBOL4 subset in that it incorporates an abstract machine, a high-level abstract syntax (in the form of mutually recursive mode definitions) for the internal form of programs, and a set of mutually recursive interpretation procedures for programs in this internal form. The various aspects of the processor are documented in some detail. The experience of testing the processor is briefly discussed.     

抓住机遇迎接挑战开创水电建设事业的新局面

“八五”计划期间是我国水电建设历史上最好的发展时期，预计投产１５００万ＫＷ以上，是“七五”计划的１．６４倍；“八五”末，在建规模（全口径结转）在３８００万ＫＷ以上。制定水电“九五”计划的基本思路是加强宏观调控，优先发展水电；促进联合办电，坚持西电东送；优化水电结构，发展调峰电源；坚持因地制宜，大中小水电并举；梯级连续开发，建立滚动开发机制。发展目标是２０００年全口径装机达到７０００万ＫＷ。展望２０     

准噶尔盆地“八五”油气勘探成果及“九五”勘探设想

“八五”期间，在准噶尔盆地先后发现了彩南、石西、玛北、小拐等４个油气田和五区南油气藏，超额完成了“八五”计划所规定的油气储量增长任务。这些成绩是由于认真贯彻了“稳定东部，发展西部”、“油气并举”的石油工业工作方针，以新的油气勘探理论为依据，以先进的油气勘探技术为手段取得的。“九五”期间盆地的油气勘探应以盆地腹部为重点，继续深化西北缘斜坡区的勘探；以经济效益为中心，油气并举，力争在准东、昌吉凹陷东斜坡有新的发现；继续探查外围中小型盆地，攻克山前陡构造和深部钻探技术，为油气勘探准备新的接替区；应用盆地模拟、圈闭描述、油藏描述等三大评阶技术，不断改善资源储量序列结构，使油气勘探步入良性循环轨道。     

STOCHASTIC MODELING OF NON-LINEAR SIEVING KINETICS

The feed to a sieve is classified as oversize particles, undersize particles, and near mesh size particles. The sizes of the near mesh size particles vary around that of the sieve opening; the passage of these particles through the sieve effects the separation. A stochastic approach is employed for analyzing and modeling the sieving kinetics of the near mesh size particles, usually constituting the bulk of the material required to be separated. The master equation of the process is formulated based on probabilistic considerations, describing the passage of the particles in the presence of sieve blinding. However, an analytical solution cannot be obtained directly and hence a rational approximation technique, the system size expansion, is utilized to solve the master equation. This results in a system of non-linear, coupled, ordinary differential equations for the various statistical quantities characterizing the number of particles retained on the sieve and the number of blinded apertures. These equations are then solved numerically. From these general equations, specific cases as the first order kinetics law, applicable to the terminal stages of sieving, are easily obtained. In the absence of oversize particles, the process is described by a master equation which is solved directly, yielding an explicit analytical solution. The numerical solutions agree at least qualitatively with the available experimental observations     

猫跳河流域水电开发规划（回顾）

猫跳河流域梯级开发，为我国在一条河流上进行梯级电站的全部合理的开发利用、连续建设创造了一条成功的经验．它的开发成功，不仅为贵州提供了廉价的电力，促进了工农业生产的发展，还发展了“以发电为主，结合农灌、工业、生活供水、水产养殖、风景旅游、调节气候、保护生态”等多种综合利用效益，为繁荣贵州省的经济作出了贡献。     

低重复频率脉冲掺镱光纤放大器

为了研究低重复频率两级脉冲掺Yb3+光纤放大器,采用脉冲信号驱动的半导体激光器作为种子光源,产生重频100Hz、半峰全宽100ns、能量30nJ的矩形光脉冲。第1级放大采用单模掺Yb3+光纤放大器,双程放大方案有效地抑制了放大自发辐射,放大后的脉冲能量达到了8.2μJ。第2级放大采用纤芯直径15μm的双包层掺Yb3+光纤放大器,大功率多模半导体激光器连续抽运。结果在抽运功率为7.3W时,放大输出脉冲能量达到了242μJ,放大输出半峰全宽压缩为29ns。输出的光束质量较好,为准单模输出。结果表明,该光纤放大器输出脉冲能量高,具有全光纤化、结构简单的特点。     

The Story of Istanbul's Modernisation

Since reform started under Ottoman rule in the early 19th century, Istanbul has undergone a substantial period of modernisation that has spanned more than 150 years. İlhan Tekeli outlines the metropolis' enduring development, characterising Istanbul's transformation into a modern city into four distinct periods. It is a story that bridges the collapse of the Ottoman Empire and the reconstruction of the Turkish Republic as a nation-state, with the initial demise of the city in favour of Ankara; and continues with Istanbul regaining its status as a world city; as it evolves from a monstrous industrial city to an urban region and global centre. Copyright © 2010 John Wiley & Sons, Ltd.     

福州大学新校区综合训练馆设计

高校体育场馆的建设在多功能、多适应性上提出了更高的要求。在福州大学新校区综合训练馆的设计中通过平面、剖面和立面的整体设计实现了提供尽可能多的运动场地的设计目标,体现了“少费多用”的设计原则。     

创新驱动,转型发展,加快推进上海国际大都市规划建设

从上海国际化大都市建设和规划管理实践的角度,分析了上海控制性详细规划管理的主要内容,围绕控制性详细规划的编制方法、技术准则、成果规范和管理规程等研究成果,提出了进一步完善控制性详细规划管理体制和机制,控制性详细规划的编制和实施等要求,为上海控制性详细规划管理机制提供了明确的方向。     

VRRP在西山信息骨干网改造中的应用

随着网络应用的不断普及,企业生产和安全对网络的安全性、可靠性提出越来越高的要求。采用虚拟路由冗余协议(VRRP)的优势在于不同厂商的路由器(交换机)可以形成一个组,协同工作,构成一台虚拟路由器,提供路由的冗余备份,用户终端不需要进行动态路由和路由发现协议的配置,即可获得一个高可靠性的缺省路由通道。介绍了VRRP的基本原理,结合西山煤电集团公司骨干网络改造的实践,提出应用VRRP进行IP业务可靠传输的方案。