超声波流量计在人工煤气流量计量中的应用

文章着重介绍超声波流量计的原理及其在苏州河和上海吴淞煤气制气有限公司的应用情况。2007年上海维思公司CL系列双声道超声波流量计取代了原苏州河四通道流量计及吴淞公司单通道流量计,新流量计在稳定性及数据完整性方面均明显优于原超声波流量计。但由于标定等问题尚未彻底解决,超声波流量计在人工煤气上的应用还有待于进一步的探索和研究。     

超声波流量计在城市燃气管网的应用

介绍超声波流量计的工作原理,与罗茨流量计进行性能对比。探讨了超声波流量计计量精度的主要影响因素(气体组成、流场、脏污)及应对措施。     

便携式超声波流量计使用探讨

详细介绍了便携式超声波流量计的工作原理,指出便携式超声波流量计是检测的一种重要手段,通过分析便携式超声波流量计的安装和重要参数设置,对安装要点和参数设置问题进行了解析,对保证水系统检测的准确有一定的现实意义。     

气体超声波流量计用降噪整流装置的研究

介绍用于气体超声波流量计的降噪整流装置的结构和原理以及在降噪和整流方面的试验。通过测试调压器产生的超声波噪声对超声波流量计的干扰情况来验证降噪整流装置的降噪效果。通过分别检定安装和未安装降噪整流装置的超声波流量计的相对误差和重复性来验证降噪整流装置的整流效果。试验数据表明:降噪整流装置可以有效减少干扰源超声波噪声的影响,可以有效解决超声波流量计受管道内紊乱气流影响所导致的准确度变差的问题,安装降噪整流装置的超声波流量计的重复性要明显好于未安装降噪整流装置的超声波流量计的重复性。     

超声波流量计的原理及应用

通过对超声波流量计的发展及原理的简单概述，对超声波流量计的技术特性进行了分析，并进一步从其实际运用特点，器具选型及安装使用等方面进行了论述，介绍了该流量计使用中应注意的事项，提出了超声波流时计选型，操作及安装的基本方法。同时，通过总结，分析超声波一计存在的优，缺点，对其发展前景进行了探讨性研究，解决了实际工作中对超声波流量计认识上含糊不清的问题。     

超声波流量计在天然气计量上的探索与应用

计量差管理是燃气企业一项重要工作。本文首先介绍了超声波流量计的计量原理、测量范围以及安装要求等,并与涡轮流量计作对比。在此基础上,结合我公司对公共卫生临床中心的试点实例,探索了使用超声波流量计开展燃气计量的效果,并得出相应结论。     

天然气超声波流量计的应用及检定

介绍了天然气超声波流量计的工作原理和特点,探讨了干式检定和实流校准。     

浅谈超声波流量计的应用

介绍了超声波流量计的工作原理、结构、选型原则及安装要求。     

超声波流量计在天然气贸易结算的应用

分析了超声波流量计的应用现状及和技术特点,论述了FLOWSIC600超声波流量计的系统组成、运行模式,以及将该流量计用于大张坨地下储气库的改造方案。     

超声波流量计的几个问题处理方法

引言 超声波流量计在我司已使用近7年时间。本文介绍了在运行过程中流量计发生的几个独特的故障现象及其解决方法,供同行参考。     

Architecture as Index: Toward a Theory of Contingency

Many theorists explore the problem of content in architecture in terms of representation, or the utilization of symbolic and often historicist imagery to ex-tend an object's meaning within a larger spatial/cultural context This paper suggests that an alternate mode of establishing associative content can be based in abstraction, or nonrepresentational means in terms of architecture's capacity to perform as “index.” The notion of index is an attempt to understand architecture as a direct physical manifestation of an external cause based on establishing an explicit physical connection, or cross-referencing between “cause and effect” The result is an architecture contingent upon those factors that can generate an inalterable formal response, or an architecture that “makes itself.”     

西安市发展屋顶绿化应注意的若干问题

介绍了西安地区的气候特征和西安城区屋顶的建筑形制,详细分析了西安屋顶绿化建设的可行性,并提出了西安屋顶绿化应该注意的问题,为西安屋顶绿化的普及提供了理论方法依据。     

Proposed future underground projects in sweden

The author describes a number of underground projects proposed by Swedish architects, engineers and planners. These include an underground wind tunnel built in rock, an underground museum, underground gas storage facility, an underwater traffic tunnel for Stockholm, and a large conference center under Stockholm, an underground concert hall in Jönköping, underground grain storage and oil storage facilities in rock caverns, and an underground pipeline to bring fuel to Stockholm airport, underground peak power-stations, and an underground waste treatment facility.     

“天人长安,创意自然”——2011西安世界园艺博览会场址规划思想探源

就2011西安世界园艺博览会场址的规划设计从思想理念的角度进行了整体的诠释。2011西安世界园艺博览会场址规划设计通过对西安世园会主题的解析,表达了以自然环境、地域特征、文化传承、当代创意为脉络的规划设计思想,阐述了世园会规划与西安城市发展的互动关系。     

弹性半空间地基上四边自由矩形板的弯曲解析解

采用双重Fourier变换,分析得到弹性半空间受任意竖向荷载作用下的静力积分变换解,与四边自由矩形板的弯曲解析解相结合,得出弹性半空间地基上四边自由矩形板受任意竖向荷载作用的弯曲解析解。给出一些算例结果,与有限元方法给出的计算结果进行了比较,结果吻合良好,证明本文的方法是切实可行的。     

Object-Oriented Development of Large Engineering Software using CLIPS

Abstract: Object-oriented programming has emerged as one of the most promising paradigms for developing software and it has gained wide acceptance from software reengineers in diverse disciplines. Recent release of CLIPS, the C Language Integrated Production System developed by NASAS Johnson Space Center, includes an object-oriented language called COOL which is an acronym for CLIPS Object-Oriented Language. This paper evaluates COOL as an object-oriented programming language and shows an object-oriented approach to develop a large engineering software using CLIPS. A CLIPS implementation of an algorithm for a space structure's optimal sensor placement is given as an example.     

Technology commercialization on campus: twentieth century frameworks and twenty-first century blind spots

This paper uses an interpretive analysis to exam past and present developments in knowledge commercialization and provide researchers, policy makers, and university leaders an alternative framework. The model is based on historical precedent, and current economic realities, for effectively commercializing knowledge in the entrepreneurial age. While traditional technology transfer focused on an organizational centric approach, we propose an individual centric model of technology commercialization from universities. The move from an organization centric model to an individual centric model will likely follow past eras of change and innovation in higher education. The challenge for regional and university leadership is clear. Find methods and models for unleashing the knowledge across campus to solve local and regional challenges.     

专家系统开发环境

本文介绍了专家系统程序设计语言,阐述了专家系统建立工具的基本结构和常用技术,而后分析了专家系统生命周期各阶段的特点,最后对于专家系统智能工具进一步研究的可行途径做了简明的讨论。     

高校奥运场馆体育馆赛后运营模式初探

以作为2008年奥运会羽毛球及艺术体操比赛馆的北京工业大学体育馆为例,结合其既是奥运场馆同时也是高校体育馆这一双重特点,提出赛后运营的初步设想,为探讨此类场馆的赛后运营管理问题提供参考。     

Ventilation Design of Enclosed Underground Structures

This paper proposes an alternative approach to the ventilation design of enclosed and half-enclosed underground structures, where more detailed analysis is required. Theoretical basics are represented and an area of application is determined. To show the advantage of such an approach a calculation of movement of exhausted air through an enclosed structure as a function of time has been executed.