共查询到17条相似文献,搜索用时 109 毫秒
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作为辐射生物学发展的前沿,微束已经成为当今世界上用来研究低剂量辐射生物效应的一个强有力手段.单离子微束装置是一种将离子束斑的直径限制在微米量级范围内,并能将预定数目的离子精确注入到细胞中某一指定位置的辐射装置.结合一套自行开发的控制程序,CAS-LIBB微束装置的计算机控制系统可以实施对生物样品的精确定量和定点辐射.本文首先给出了装置定量和定点辐射的精度测定结果,该精度完全能够胜任细胞-亚细胞尺度的精确辐射.接下来详细探讨了控制系统的改进工作,最后对控制系统进行了展望. 相似文献
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该文研究了微束系统中的细胞图像处理问题。着重从微束装置的实际情况出发,对不同于一般图像处理的微图像处理进行了介绍,详细讨论了整个图像处理的过程,并探讨了微图像处理在整个微束计算机控制系统中的重要作用。 相似文献
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张健 《计算机工程与应用》1997,33(3):66-69
变频器作为一种高效节能的调速装置,正得到越来越广泛的应用。本文提出一种计算机控制变频器系统。该系统可使计算机控制多台变频器,构成连续生产线中的多台电动机调速系统。本文详细介绍了系统的硬件构成、计算机与变频器之间的通讯原理和通讯命令、以及系统的软件实现 相似文献
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本文介绍我国在大型纸机上运行的国产化系统“纸张定量水份检测及计算机控制系统”,系统的组成、控制系统分析、数学模型以及数据处理和应用效果。 相似文献
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中性束注入加热(NBI)是核聚变实验装置最重要的辅助加热方法之一,针对现有的管理软件无法实现对NBI系统的全局管理和实时监控的问题,为适应NBI系统本身的复杂性以及其高电压、高辐射的复杂的工作条件,提出了一套NBI系统管理的新方法.本文介绍了基于网络的NBI控制系统管理软件的设计与实现过程. NBI控制系统管理软件主要基于客户机/服务器结构、多线程技术、socket通信技术、心跳波机制开发,它提供给用户一套标准的接口和统一的管理终端用以实时监控和远程管理运行在不同平台下、不同类型的硬件设备和软件系统.该系统的实现可以增强NBI各子系统运行的稳定性,为中性束注入装置的可稳态运行提供保障. 相似文献
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机器人技术是现代自动控制领域出现的一种新技术,是在控制工程、计算机科学、人工智能和机构学等多种学科的基础上发展的综合技术。微型计算机在机器人技术中扮演着重要的角色,它的发展有力地推动了机器人技术的进展。本文将介绍一个利用微机实现的移动式机器人装置的二级计算机控制系统。 相似文献
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论文研究了微束系统中的细胞图象识别技术。着重从提高图象质量出发,对图象识别的流程和影响图象质量的因素进行了介绍,详细讨论了几种图象识别技术,并给出了一种典型的图象识别的步骤。 相似文献
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作为中国主要核聚变试验基地的中科院等离子物理采用了VXI总线采集系统作为现有的HT-7托卡马克和建造中的国家“九五”重大科学工程HT-7T托卡马克的分布式数据采集的重要组成部分。本文较为详细地介绍了该系统的结构组成。 相似文献
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作为中国主要核聚变试验基地的中科院等离子物理所采用了PCI总线采集系统作为现有的HT-7托克马克和建造中的国家‘九五’重大科学工程HT-7U托克马克的分布式数据采集系统的重要组成部分。文章较为详细地介绍了该系统的结构组成及其功能实现。 相似文献
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Ghader Rezazadeh Mohammad Fathalilou Rasool Shabani Saeid Tarverdilou Soheil Talebian 《Microsystem Technologies》2009,15(9):1355-1363
In this paper flexural vibrations of an electrostatically actuated cantilever microbeam in an incompressible inviscid stationary
fluid have been studied. By applying “Three dimensional aerodynamic theory” pressure jump across the microbeam has been investigated and the inertial effects of fluid on microbeam dynamics have been
modeled as a mass added to microbeam mass. Magnitude of the added mass has been calculated for various aspect ratios of cantilever
microbeams and compared with those of clamped-clamped microbeams. To investigate the dynamic characteristics, it has been
considered that the microbeam has been deflected by a DC voltage, V
DC and then the dynamic characteristics and forced response of the system have been considered about these conditions. Galerkin-based
step by step linearization method (SSLM) and Galerkin-based reduced order model have been applied to solve the nonlinear static
and dynamic governing equations, respectively. Water by neglecting viscidity effects, as an instant has been considered as
a surrounding fluid and the frequency response of the microbeam has been compared with that of vacuum conditions. It has been
shown that because of the added mass effects in watery environment, the natural frequencies of the microbeam decrease. Because
of the higher dielectric coefficient and increasing electrical stiffness and decreasing total stiffness consequently, maximum
amplitude of the microbeam vibrations increases in watery environment, compared with vacuum. Moreover, it has been shown that
increasing the DC voltage, increases the electrical stiffness and maximum amplitude of the microbeam vibrations, consequently,
It has been shown that in higher voltages (near pull-in voltage), the rate of variation of resonance frequency and maximum
amplitude is stronger than lower voltages. 相似文献
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In this paper, flutter and divergence instabilities of a cantilever, a clamped–clamped, and a cantilever with intermediate
simply-support microbeam sandwiched by piezoelectric layers have been studied. By presenting a mathematical formulation and
numerical solution, critical piezoelectric force for avoiding of the instability in a cantilever microbeam has been calculated
and validated by known buckling capacity of Beck column. By applying a similar mathematical analysis it has been introduced
a critical piezoelectric voltage for a clamped–clamped microbeam. It has been shown that for cantilever microbeams, increasing
of the follower piezoelectric force leads to: first flutter and then divergence instabilities whereas in the clamped–clamped
microbeams only divergence instability can be occurred. Also effects of the intermediate simply support position on the critical
piezoelectric voltage of a cantilever microbeam have been investigated. It has been shown that for case when the intermediate
simply support is near to the fixed end of the cantilever increasing of the follower piezoelectric force leads to flutter
instability but for case when the intermediate simply support is near to the free end of the cantilever it leads to divergence
instability. 相似文献
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基于Web的虚拟设计中VRML实时模型的可交互处理方法 总被引:3,自引:0,他引:3
提出一种基于Web的虚拟设计系统的基本结构,对其中在Web页面上展示产品的VRML模型提出了一种可实时交互的处理方法,包括对VRML模型的可交互操作进行预定义、预定义的节点信息和数据库之间的逻辑关系以及根据预定义信息对VRML模型文件进行自动处理的相关算法,最后在系统原型中具体实现了该方法。 相似文献