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1.
将LXI技术应用到自动测试系统中可以很好地实现测试系统快速、高效和低成本的建立和重新配置。从测试总线的发展着手,介绍了LXI技术的优点,较深入地分析了同步和触发技术的原理以及在分布式测试系统中的应用方法。  相似文献   

2.
针对惯导平台远程测试的需求,本文研究设计了基于LXI总线技术的网络化测试系统,着重对系统涉及的同步、实时性、触发方式等关键问题进行了深入分析,并给出了具体解决方案,可实现异地访问测试设备和测试信息的共享,及时完成诸如远程测试参数分析、故障诊断、专家指导维修等工作。  相似文献   

3.
在供电设备中,吹灰是其中一个至关重要的环节。针对现今各类吹灰系统吹灰效率低的现实,依据冲击波吹灰原理,本文提出了应用Intouch软件实现人机交互的冲击波吹灰系统方案。即运用intouch设计监控主机,监测、控制现场的PLC控制单元。详细介绍了应用InTouch设计冲击波系统监控界面,Intouch通信的原理及配置等。实践表明,冲击波吹灰系统稳定性强,实现了控制、维护与技术管理的集成,具有较强的实用价值。  相似文献   

4.
针对传统的测试任务管理系统存在的诸多问题,以及人们长期以手动的方式管理测试任务信息所带来的弊端,本文提出了一个高效、可靠的订单管理系统。该系统采用流程化管理,并对订单测试项目的排序和调度进行了设计,实现了系统的智能化和规范化。试验结果表明:该系统具有良好的稳定性,可以有效减少生产测试周期,降低生产成本。  相似文献   

5.
基于对中小企业边际型和适应型渐进性创新的类型划分,采用实证的研究方法,探讨了不同创新类型下技术属性对企业技术获取策略选择及绩效的影响。研究发现:技术复杂性对企业在适应型创新模式下的外部技术获取策略具有显著影响;技术隐性则对企业内部技术获取策略影响较大。其次,边际型创新模式下的外部技术获取策略最有利于降低企业研发成本;而无论在何种创新模式下,内部技术获取策略都能比采用外部技术获取策略获得较高的财务绩效。  相似文献   

6.
断靶触发是一种常用的仪器触发方式,断靶测试在靶场中的应用非常广泛。其原理为,不产生信号时,是通路状态,当产生信号时变为断路状态,因其为无源信号,因此需要对此进行调理产生电压信号,以便可以触发仪器设备,在靶场中主要应用于触发测试设备。例如飞行时间测试,当弹丸通过断靶时,利用其切断断靶产生的高电平信号来触发测试仪器工作,但在火箭橇连续多点断靶测试中,为了使数据采集系统每个通道记录多个信号,就需要将每个断靶信号(高电平信号)调理成一个单脉冲信号,以利于数采系统每个通道对多个信号的记录。这样就可以大大减少数采系统通道数的使用及减少信号线的布设,减轻测试工作量。针对于此,设计了断靶调理电路,本文通过用D触发器设计的断靶信号调理电路采集的信号和用积分型电路设计的断靶信号调理电路采集的信号进行比较,分析了这两种电路产生不同信号的原因,并对就断靶信号变换成单脉冲信号的两种电路理论设计和实际调试差异情况进行了分析。上两种电路的分析可知,平时电路设计理论和实际还是有一定差异的,只有经过实际的调试并结合理论分析才能设计出功能可靠、合理的电路。  相似文献   

7.
《科技风》2020,(16)
为了获取移动设备的位置,基于STM32单片机和GPS模块设计了一款卫星定位系统。用此系统可以准确的获得物体所在位置的经度、纬度、海拔高度、日期等信息,再利用LCD屏幕进行显示,而且可以利用STM32f103RCT6芯片的剩余资源对所需信息进行进一步的处理与应用。这套系统具有结构简单、操作便捷、性能可靠、成本低廉等优点。  相似文献   

8.
文中运用柔性测试技术解决汽车电子控制系统试验测试问题。通过基于虚拟仪器技术,构建汽车发动机电子控制系统、自动变速器电子控制系统、电动助力转向电子控制系统的测试系统,研究柔性测试技术的实现。汽车电子控制测试系统设计应用了虚拟仪器技术、接口标准化与部件模块化、机电一体化、网络技术等多个方面的技术,测试系统结构模块化、电气接口标准化、数据采集卡的通用化及软件复用组件化是汽车电子控制系统柔性测试系统的主要方法和方向。  相似文献   

9.
超压现象在现代消防给水系统中很常见,超压不仅仅会浪费水资源,同时还会对消防给水系统的安全性造成影响。文章针对消防给水系统中所遇到的常见的超压问题以及超压危害进行了分析,详细论述了该种现象产生的原因。并着重分析了常用的减压措施,针对消防给水系统中自动喷水以及消防栓系统的超压现象提出了相关的解决措施。分别从选择水泵、布置管网、减压设备的安装和承压的提高等方面对超压问题的处理提出了多种解决途径。  相似文献   

10.
本设计分析除颤器的检定要求和内容,基于单片机终端的数字滤波技术和虚拟仪器技术,提出心电信号模拟器、安全检定信号发生装置、负载模拟器、单片机系统和通用计算机等分离式除颤器检定系统设计。测试系统有利于提高检定过程适应性和灵活性,降低测试成本和硬件成本。  相似文献   

11.
Aresearch group led by Prof. ZHAI Qiwei from the Institute for Nutritional Sciences under the CAS Shanghai Institutes for Biological Sciences has discovered that even relatively low doses of resveratrol--a chemical found in the skins of red grapes and in red wine--can improve the sensitivity of mice to the hormone insulin, according to a report in the October,2007 issue of Cell Metabolism. As insulin resistance is often characterized as the most critical factor contributing to the development of Type 2 diabetes, the findings“provide a potential new therapeutic approach for preventing or treating” both conditions, the researchers said.  相似文献   

12.
This study examined how students who had no prior experience with videoconferencing would react to the use of videoconferencing as an instructional medium. Students enrolled in seven different courses completed a questionnaire at the beginning of the semester and again at the end of the semester. Students at the origination and remote sites did not differ in their reactions toward videoconferencing but there was a significant difference for gender. Women reacted less favorably to videoconferencing. Compared to the beginning of the semester, students reported significantly less positive attitudes toward taking a course through videoconferencing at the end of the semester. There were no significant differences in students' attitudes toward videoconferencing across courses at the beginning of the semester but there were significant differences across the courses at the end of the semester. The results suggest the need for better preparation for both students and instructors.  相似文献   

13.
Active biological molecules and functional structures can be fabricated into a bio-mimetic system by using molecular assembly method. Such materials can be used for the drug delivery, disease diagnosis and therapy, and new nanodevice construction.  相似文献   

14.
Ajoint study by Prof. ZHANG Zhibin from the CAS Institute of Zoology and his co-workers from Norway, US and Swiss have indicated that historical outbreaks of migratory locusts in China were associated with cold spells, suggesting that China's projected climate warming could decrease the pest's numbers. The study was published in Proceedings of theNational Academy of Sciences on 17 September, 2007.  相似文献   

15.
CAS should stick to the principle of rendering service to, and giving impetus for, the development of China's science enterprise by making S&T innovations, said CAS President LU Yongxiang. The CAS president made the remarks in a recent talk to communicate the gist of the winter session of the Party's Leading-member Group at CAS, which was held from 7 to 11 January in Beijing.  相似文献   

16.
A computer-mediated group is a complex entity whose members exchange many types of information via multiple means of communication in pursuit of goals specific to their environment. Over time, they coordinate technical features of media with locally enacted use to achieve a viable working arrangement. To explore this complex interaction, a case study is presented of the social networks of interactions and media use among members of a class of computer-supported distance learners. Results show how group structures associated with project teams dominated who communicated with whom, about what, and via which media over the term, and how media came to occupy their own communication niches: Webboard for diffuse class-wide communication; Internet Relay Chat more to named others but still for general communication across the class; and e-mail primarily for intrateam communication. Face-to-face interaction, occurring only during a short on-campus session, appears to have had a catalytic effect on social and emotional exchanges. Results suggest the need to structure exchanges to balance class-wide sharing of ideas with subgroup interactions that facilitate project completion, and to provide media that support these two modes of interaction.  相似文献   

17.
With great care, Dr. ZHOU Zhonghe takes out a package wrapped by cotton tissue from a drawer and says: "This is the gem of our collections: the fossil of a bird that lived 125 million years ago!" Then, pointing at a tiny mound, he explains: "Look, this is the claw and that is the head. It was in the egg shell and ready to hatch ... The species fell into a family of waterside inhabitants."  相似文献   

18.
Electronic data interchange (EDI) provides means for interorganizational communication, creates network externalities, requires an advanced information technology (IT) infrastructure, and relies on standards. In the diffusion of such innovations, institutional involvement is imperative. Such institutions contain governmental agencies, national and global standardization organizations, local government, and nonprofit private organizations like industry associations. The last type of organizations we call intermediating institutions. They intermediate or coordinate ("inscribe") the activities of a group of would-be adopters. Unfortunately, little is known of how these organizations shape the EDI diffusion trajectory. In this article we examine one specific type of intermediating organizations?industry associations?and how they advanced the EDI diffusion process in the grocery sectors of Hong Kong, Denmark and Finland. We identify six institutional measures, placed into a matrix formed by the mode of involvement (influence vs. regulation) and the type of diffusion force (supply push vs. demand pull), that can be mobilized to further the EDI diffusion. Industry associations were found to be active users of all these measures to varying degrees. Their role was critical especially in knowledge building, knowledge deployment, and standard setting. Furthermore, institutional involvement varied due to policy and cultural contingencies and power dependencies.  相似文献   

19.
This essay focuses on universal service and the Internet as means to support social and political participation. The emphasis on access to telecommunications systems in conventional approaches to universal service is contrasted with access to content. A model of the information environment is described that accounts for the roles of content and conduit, both of which are necessary conditions to achieve true access. A method is outlined for employing information indicators to observe or measure the information environment.  相似文献   

20.
The increasing prospects of digital piracy has prompted the perceived need by electronic publishers to adopt technical systems of protection, and governments to reform their copyright laws. This article is a preliminary study of the management of intellectual property by electronic publishers, defined as those involved in the production of online databases, and CD-ROMs. It focuses on three main issues: (1) how electronic publishers view the increasing threat of piracy; (2) the methods of protection employed to protect intellectual property in digital format; and (3) the importance of technological protection of intellectual property in electronic publications. The analysis is based on a sample of 23 UK electronic publishers. The interviews revealed an interesting assortment of protection methods and did not show that technological protection was a preferred way. Instead, the means of protection, in addition to copyright law, comprised niche markets, pricing, trust, bad publicity, and nontechnical and technical means.  相似文献   

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