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鼠标器属于一种“指点”设备,是一些菜单式软件和图形系统中常用的输入设备。它的外形各式各样,上面一般有2到3个按钮(也称键)。鼠标通过RS-232C接口与计算机连接,在专门软件的支持下,操作者手持鼠标器在桌面或一块专用板上滑动,并在鼠标光标所选位置点击有关按钮,就可完成相应操作。 目前使用的鼠标有机械鼠标、光学鼠标、光学机械鼠标3种。 1)机械鼠标(mechanical mouse) 这种鼠标器的内部装有一个直径为2.5cm的橡胶球,通过它在平面上的滚动把位置的移动转换成计算机可以理解的0、1信号,传… 相似文献
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本文详细介绍了在不支持鼠标器操作的Foxbase应用程序中使用鼠标器的具体办法,其中涉及的鼠标器应用知识及鼠标器编程方法及思想,对于用其它语言编制软件,也有一定参考价值。 相似文献
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本文详细介绍了在不支持鼠标器操作的Foxbase应用程序中使用鼠标器的具体办法,其中涉及的鼠标器应用知识及鼠标器编程方法及思想,对于用其它语言编制软件,也有一定价值。 相似文献
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介绍了PASCAL语言中对鼠标器调用的编程原理和方法,以及有关鼠标器的机械原理和编程原理,并给出了图形模式下的作图编程的基本过程和直线、直方图等作图编程的具体源程序。 相似文献
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1鼠标器的工作原理及分类鼠标器一般通过RS-232串行口和计算机连接。常用的鼠标器分为机械式和光电式两种。机械式鼠标器底部有一个橡胶制成的小球,当移动鼠标时,小球相应滚动。在鼠标器内部有两个互成90o的滚柱,每个滚柱连一个红外线光电转换装置。在移动鼠标器时,小球带动滚柱转动,将小球的运动转变为相互垂直两个方向的运动。同时,滚柱带动光电转换器生成水平和垂直方向两种电脉冲。当鼠标器上下移动时,水平滚柱转动产生垂直移动脉冲;当鼠标器左右移动时,垂直滚柱转动产生水平移动脉冲。这样鼠标器的移动转变为两种电脉冲的组… 相似文献
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为解决当前微型无人机机电性能研究较少的问题,研究了微型固定翼无人机静态和动态工作机电特性,建立该平台飞行功率与工作电流、拉力、螺旋桨风场等因素间的数学模型.以后退式无人机机体为基础,研究螺旋桨在旋转中不同平面中不同距离、工作电流等因数下无人机风场变化.最后通过该平台验证该无人机的工作特性和可行性.试验结果表明,无人机电机转速、拉力与工作电流呈对数关系,其拟合系数R2大于0.95,同时拉力与转速两者之间呈直线比例关系.随着无人机载重的不断增加,机翼变形也不断增加.从风场曲面得出距离螺旋桨15 cm处的风速最小,在左右5 cm处的风速最大,螺旋桨中心位置形成了一个低于最大风速的管道.此外,通过分析实验数据得到了平行和垂直于螺旋桨转动平面,及风场变化的三维曲面和等高曲面图等,曲面图直观反映无人机在不同工作电流的风场变化特性,为今后微型固定翼无人机的设计和应用提供必要理论依据. 相似文献
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Lance Stout Matthew Walker Jérôme Lauret Sebastien Goasguen Michael A. Murphy 《Journal of Grid Computing》2013,11(2):249-264
This paper presents the results and experiences of adapting and improving the Many-Task Computing (MTC) framework Kestrel for use with bag of tasks applications and the STAR experiment in particular. Kestrel is a lightweight, highly available job scheduling framework for Virtual Organization Clusters (VOCs) constructed in the cloud. Kestrel uses the Extensible Message and Presence Protocol (XMPP) for increasing MTC platform scalability and mitigating faults in Wide Area Network (WAN) communications. Kestrel’s architecture is based upon pilot job frameworks used extensively in Grid computing, with fault-tolerant communications inspired by command-and-control botnets. The extensibility of XMPP has allowed development of protocols for identifying manager nodes, discovering the capabilities of worker agents, and for distributing tasks. Presence notifications provided by XMPP allow Kestrel to monitor the global state of the pool and to perform task dispatching based on worker availability. Since its inception, Kestrel has been modified based on its performance managing operational scientific workloads from the STAR group at Brookhaven National Laboratories. STAR provided a virtual machine image with applications for simulating proton collisions using PYTHIA and GEANT3. A Kestrel-based Virtual Organization Cluster, created on top of Clemson University’s Palmetto cluster, CERN, and Amazon EC2, was able to provide over 400,000 CPU hours of computation over the course of a month using an average of 800 virtual machine instances every day, generating nearly seven terabytes of data and the largest PYTHIA production run that STAR has achieved to date. 相似文献
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Ming-Liang Xu Ning-Bo Gu Wei-Wei Xu Ming-Yuan Li Jun-Xiao Xue Bing Zhou 《计算机科学技术学报》2017,32(6):1162-1171
The three-dimensional packing problem is generally on how to pack a set of models into a given bounding box using the smallest packaging volume. It is known as an NP-hard problem. When discussing the packing problem in mechanical field, the space utilization of a mechanism is low due to the constraint of mechanical joints between different mechanical parts. Although such a situation can be improved by breaking the mechanism into components at every joint, it burdens the user when reassembling the mechanism and may also reduce the service life of mechanical parts. In this paper, we propose a novel mechanism packing algorithm that deliberately considers the DOFs (degrees of freedom) of mechanical joints. With this algorithm, we construct the solution space according to each joint. While building the search tree of the splitting scheme, we do not break the joint, but move the joint. Therefore, the algorithm proposed in this paper just requires the minimal number of splits to meet the goal of space utilization. Numerical examples show that the proposed method is convenient and efficient to pack three-dimensional models into a given bounding box with high space utilization. 相似文献
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简要介绍了电解沉积锌生产过程中的阴极板预剥锌工艺。应用断裂力学理论对过程中锌铝结合结构界面的分离过程进行了分析;对预剥锌过程进行了试验研究,并得出了锌片受力曲线;使用Ansys对预剥锌工艺过程进行仿真,将仿真分析与试验所得结果进行了对比分析,并进一步运用仿真分析了不同情况下最大预剥力的变化。研究结果表明:(1)刀具角度越小,所需的外载越小,刀具刀刃角度在40°至45°时刀具的强度与载荷能达到较优平衡;(2)锌片与极板间结合强度对预剥力的影响非常小,锌片界面端附近的塑性变形消耗了大部分的外载。研究成果对剥锌机的设计与优化具有重要参考价值。 相似文献
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