液压传动虚拟实验室开发平台的框架设计

针对军队院校和科研院所教学和科研工作的需求,通过对液压传动虚拟实验室开发平台的功能分析,确定了该平台的主要研究内容、方案和关键技术,并对方案的可行性进行分析,构建出具有自身特色的液压传动虚拟实验室开发平台。     

PLC虚拟数字实验室

采用计算机仿真技术,开发了由虚拟的多种常用PLC系统和多种多媒体图形动画虚拟PLC被控对象组成的PLC虚拟数字实验室系统;提出了解决工程教育中虚拟数字实验室的设计方案、框架结构、实验环境、实验方法和实验操作步骤.     

Virtual Teams: Guide to Successful Implementation

The successful initiation and execution of a virtual team is gaining increasing attention in the design and construction community. From opportunities to integrate international and multidisciplinary teams to the opportunity to leverage the best resources in an organization on a given project, virtual teams can transform the concept of project planning and execution. However, potential barriers exist in several areas to the successful implementation of virtual teams. The needs of increased management emphasis, social and cultural understanding, and emphasis on common goals are only a few of the nontechnical factors that can turn successful virtual teaming into virtual frustration. When combined with traditional technical challenges including compatibility of systems, security, and the selection of appropriate technologies, the line between leveraging virtual technologies for enhanced solutions and introducing additional complications into the project process is one that can be easily crossed. This paper presents the findings of research that addresses the opportunities and potential barriers to successful virtual teams in the engineering, procurement, and construction industry. Combining results from current research, industry practices, and early results from nonconstruction industries, the research findings provide an initial path to successful virtual team implementation.     

水下机器鱼三维虚拟现实研究与实现

为创建具有真实感的虚拟现实环境,使用户能够直观感知机器鱼的实时运动状态,实现了一种基于虚拟现实技术的监测方法.在VC++的基础上利用OpenGL图形库与3D建模软件联合创建仿生机器鱼静态三维虚拟现实环境,并集合Access数据库与VC++的交互,实现机器鱼的实时运动显示,并使采样参数与采样位置有机结合显示.该系统可以实现用户从任意角度和距离监测机器鱼巡游路径、当前位置及所在区域的水质参数.系统结构清晰,旨在为实现智能化水产养殖提供参考依据.     

Preliminary Assessment and Rating of Stream Channel Stability near Bridges

The primary cause of bridge failure in the United States is scour and channel instability around the bridge foundations. The ability to assess channel stability in the vicinity of bridges is needed to alert engineers to possible unstable conditions at the bridge foundations, to design stable road crossings, and to mitigate against erosion at those structures. This information is valuable for stream stabilization projects as well, particularly for cases where the reach to be restored includes a bridge. However, a systematic methodology for rapidly assessing channel stability that is applicable at bridges located in the various regions of the country does not currently exist. In this study, an assessment method for the preliminary documentation and rating of channel stability near bridges was developed, based on prior stability assessment methods as well as observations at bridges in 13 physiographic regions of the continental United States. This method provides an assessment of channel stability conditions as they affect bridge foundations. It is intended for a quick assessment of conditions for the purpose of documenting conditions at bridges and for judging whether more extensive geomorphic studies or complete hydraulic and sediment transport analyses are needed to assess the potential for adverse conditions developing at a particular bridge in the future.     

基于Surpac矿山设计软件及虚幻引擎实现的矿山虚拟现实漫游系统

基于谷歌公司Daydream虚拟现实平台实现了一种露天矿山虚拟现实漫游系统,展示了虚拟现实技术在矿业设计领域应用的可能性。虚拟现实过程主要包括:首先,采集矿山的地形地质等三维数据,利用Surpac软件进行矿山露天设计;其次,将得到的最终露天境界和相关三维模型导入到游戏引擎中,并进行必要的场景优化;最后,利用C++语言编写脚本实现基本的虚拟现实交互功能,配合虚拟现实头显实现矿山虚拟现实漫游功能。该系统在矿山设计及效果展示上有巨大优势,能够真实呈现设计结果,提高设计效率,具有广阔的应用前景。该系统目前使用的移动平台虚拟现实技术并不成熟,延迟率较高,分辨率较低,易造成眩晕,仍有进一步提高的空间。     

Industrially Sponsored Senior Capstone Experience: Program Implementation and Assessment

The Accreditation Board for Engineering and Technology (ABET) 2000 requires that students participate in a major design experience prior to graduation. A well-planned senior design capstone program will satisfy this criterion while meeting the Criterion 3 (a–k) program outcomes. Seattle University has an industrially sponsored, year-long, senior design program that has been in existence for the past 20 years. In addition to applying the knowledge of mathematics, science, and engineering to solve a real-life engineering problem, students develop the soft skills such as project management, leadership, team work, written and oral communication, and professional networking which are important for a successful career. This paper describes the program within the Civil and Environmental Engineering department, lists the various tools used to assess the program outcomes, and includes assessment of the program by sponsoring agencies, alumni, and reflection by faculty.     

虚拟板形仪的设计及相应板形闭环控制系统的开发

针对部分轧机由于出口没有配置实物板形仪、无法实现板形的可视化显示与闭环控制、造成轧机出口板形质量较差、不能满足用户需求的问题,充分利用轧机的基本数据采集系统与板形计算模型,从板形动态显示功能、板形闭环控制功能以及板形预报功能的开发等3方面入手,提出了一套虚拟板形仪设计技术,开发出了相应的板形分析与闭环控制系统。在不增加硬件投资、不配置实体板形仪的前提下,不但实现了板形的动态可视化显示与闭环控制,而且还能实现板形在线预报功能,有效地提高了轧机的出口板形质量。此技术已经被推广应用到某钢厂1220四辊双机架平整机组,效果良好,为企业创造了较大的经济效益。     

虚拟产品开发在铁路产品研发中的应用

简要介绍了虚拟产品开发的定义、特点和研究内容,以中国南车集团"产品电子样机设计系统"为例,介绍了电子样机技术在铁路产品研发中的应用.     

Development of a Virtual Reality Structural Analysis System

This paper discusses the development of virtual structural analysis program (VSAP). This is a virtual environment (VE) based structural analysis system developed through a collaborative effort between the School of Architecture + Design and the Department of Computer Science at Virginia Polytechnic Institute and State Univ. (Virginia Tech). The VSAP was developed by linking a visualization routine using the simple VE library and a structural analysis software, the PC-SAP4. Details of the design of four user interfaces for the VSAP are presented. These user interfaces are: the immersive pen and tablet interface, the desktop interface, the portable immersive interface, and the cave automatic VE immersive interface. Usability studies for each interface were conducted. Results of these studies indicated that the users of VSAP were highly satisfied with the experience. In addition, all the developed interfaces were found to be successful for their specific application.     

Technology Assessment and Development of Large Deployable Antennas

A National Aeronautics and Space Administration (NASA) research and technology program called the large deployable antenna (LDA) program was initiated in early 1989 by NASA Langley Research Center to investigate and demonstrate the availability of critical technologies for passive microwave imagers. The NASA Office of Aeronautics, Exploration, and Technology (OAET) sponsored this research program to provide advanced sensor technologies for mission to planet Earth remote sensing applications. The goal of the OAET program is to provide the technology needed to enable and enhance the long‐term observations, documentation, and understanding of the Earth as a system. The LDA program involved university, industry, and NASA researchers and technologists with a range of skills and experience from electromagnetic theory to advanced materials and deployable structures. The study approach involved determining basic operational parameters and configurations for a geosynchronous wide‐scanning radiometer from which specific structural requirements were used as goals (rather than specifications) with which specific technologies could be evaluated. The study team performed a detailed technology review, evaluated the feasibility and technology readiness for a large dual‐reflector radiometer, and developed a system concept for a 25 m deployable radiometer. This paper describes the science objectives, reviews the current state of the art, presents electromagnetic configurations under consideration, and discusses the mechanical systems development effort.     

江西铜业的发展战略及实施步骤——在第二届中国有色金属工业投资与贸易国际研讨会上的演讲

1　发展战略及其基础和依据江西铜业作为一个在国内和国际资本市场上市的国际矿业公司 ,不能没有一个发展战略 ,那么我们的发展战略是什么呢 ?也许关注本公司发展走势的朋友们和投资者已经发现 :江西铜业的发展战略就是要做大、做强、做好 ,把江西铜业建成国际一流的矿业公司。对于这一发展战略有的同志怀疑、担心 ,有的朋友说是不知天高地厚……其实江西铜业的这一发展战略是经过深思熟虑的 ,是经过反复论证的 ,是有基础和依据的。70年代末期 ,还是在计划经济年代 ,国家就决定大力开发江西铜基地 ,要把江西铜资源优势变成铜产品优势。并采…     

基于Web的虚拟产品开发系统研究

虚拟产品开发为产品设计和生产过程的优化提供了集成的建模和仿真环境,可缩短产品开发周期,降低开发成本。从系统功能、运行方式和安全性等方面介绍了基于Web的虚拟产品开发系统。     

面向自动化实训的虚拟仿真教学系统开发

基于本校钢铁生产全流程国家级虚拟仿真实验教学中心的教学资源和硬件条件,以钢铁生产中的典型控制环节为载体,采用工业系统架构,设计开发了认知实习、仿真实训、设计教学、实践创新、考核鉴定、教学资源库等教学功能。该系统高度集成自动化控制的建模、控制算法、仿真实现、系统设计等方法,构建实时动态模型,具有层次性、系统性和实时性特点,可有效支撑自动化实训教学,为“学科交叉”实践教学改革和解决复杂工程问题能力培养提供了有利条件。     

Development and Laboratory Analysis of Silicone Foam Sealant for Bridge Expansion Joints

Sealing of bridge expansion joint systems is important to protect the structural components below the joint. An elastomeric foam-type joint sealant has been developed for sealing small-movement bridge expansion joints. Laboratory tests including tension, compression, shear, bonding, stress relaxation, cure rate, tack-free time, and water tightness were performed on this sealant. In addition, loading-unloading behavior in tension and compression and effects of immersion in saturated saltwater solution on its engineering properties were investigated. The silicone foam sealant showed an increase in volume of ～ 70% on curing and attained approximately 80% of the 21-day curing strength in the first 7 days. Tack-free time for the foam sealant was below 1.5?h and comparable to that for the solid sealant. The mechanical test results indicated lower stiffness, greater extensibility, and better bonding associated with the foam sealant compared to the solid (unfoamed) sealant. The foam sealant exhibited smaller loss in extensibility at failure due to saltwater immersion compared to the solid sealant. While in tension both sealants exhibited similar rates of stress decay, in compression the foam sealant was found to relax faster than the solid. Neither sealants exhibited any water leakage during a 96-h test period.     

基于Magic平台的ERP系统开发及应用

Magic Developer是一个强大的数据库开发平台，非常适合于管理信息系统的开发。本文介绍了Magic开发平台的功能及特色，结合基于该平台的四川启明星铝业公司ERP系统易扩展、运行稳定等优点，从而保障了EPR的成功实施。     

Laboratory diagnosis of tuberculosis: past, present, and future

Resurgence of tuberculosis justifies extraordinary efforts to expedite TB diagnosis and susceptibility testing. This demands that laboratory support expand to a "second generation" of methods and procedures, including rapid availability of fluorochrome smears of concentrated specimens, faster techniques for detection (e.g., the BACTEC radiometric broth system and microcolony detection), quicker identification (e.g., high-pressure liquid chromatography, nonisotopic genetic probes), more rapid susceptibility testing methods (e.g., BACTEC), and reporting of these results as critical values. Guidelines have been established for turnaround time for results of smears, TB organism identification, and susceptibility testing to usual first-line drugs. A "third generation" of laboratory techniques soon will make testing not only more effective but also more efficient. These methods include direct testing of respiratory specimens through nonisotopic genetic probes as well as nucleic acid amplification techniques utilizing polymerase chain reaction (PCR) and other molecular procedures. These new procedures and protocols place heavy demands on laboratory test volume, technologist time and costs. For the healthcare system or clinical laboratory without the resources to deal with these new demands, referral of TB specimens represents a reasonable alternative, as long as transport is adequate to meet current CDC and other guidelines for turnaround time.     

Laboratory of rapid diagnosis (validation, purpose, and procedures)

The authors discuss the problem of decreasing the number of errors in clinical laboratory diagnosis using artificial "neuron network" in which subjective and half-empirical euristics are replaced with objective regulations based on quantitative and logic analysis. The proposed method was used to derive the decisive rules ensuring prediction of outcomes of abdominal surgery. Reliability of prognostic table reflecting the new decisive rules in common form is confirmed by clinical data.     

Release of Polychlorinated Biphenyls from River Sediment to Water under Low-Flow Conditions: Laboratory Assessment

The diffusive release of polychlorinated biphenyls (PCBs) from sediments to water under low-flow conditions was measured for surficial sediments with different PCB concentrations collected from the Grasse River near Massena, N.Y. Data on PCB sediment-water equilibrium partitioning and PCB mass release flux from sediments were used to assess the extent and mass transfer rate of PCB release under low-flow conditions in the Grasse River. Microcosm studies were employed to evaluate the release flux of PCBs under quiescent conditions for various river sediments and sediment mixtures. The observed total-PCB release fluxes ranged from about 1 to 20 mg/m2?year, showing predominantly dichloro- through tetrachlorobiphenyls. Analyses of water column samples from the Grasse River under low-flow conditions also indicated the predominance of dichloro- through tetrachlorobiphenyls as in the microcosm tests. Data on PCB equilibrium partitioning between water and sediment were used to estimate sediment porewater concentrations, and these data combined with the microcosm flux data were used to estimate average, aqueous-boundary-layer total-PCB mass transfer coefficients of 0.3–1.5 cm/day. These values are consistent with estimates of mass transfer coefficients based on aqueous-boundary-layer correlations, and with PCB mass transfer coefficients inferred from the field data for low-flow conditions in the fall and winter (approximately 2 cm/day). The correspondence of the laboratory results with the field measurements and mass transfer rates demonstrates the usefulness of the microcosm technique for estimating fluxes of PCBs from river sediments under low-flow minimum bioturbation conditions.