共查询到20条相似文献,搜索用时 62 毫秒
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节约单片机端口资源的键盘电路 总被引:1,自引:0,他引:1
I/O端口是单片机实现对目标控制的端口,一般小型单片机的I/O端口都十分宝贵,文中介绍了一种可节省单片机I/O端口的键盘电路,分析了新型键盘电路的结构和工作原理,最后给出了基于该键盘电路的C51语言程序和软件处理过程。 相似文献
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带微处理器的智能混浊度传感器 总被引:1,自引:1,他引:0
介绍了一种内置混浊度传感器、电导传感器、温度传感器、A/D转换器、微处理器(μP)和单线I/O接口的智能混浊度传感器APMS-10G,详细阐述了其测量原理及使用注意事项。 相似文献
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介绍了DLL技术在windows编程中的基本方法及应用,并结合程序代码介绍了DLL程序直接内存访问和端口I/O读写的具体实现过程。 相似文献
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TonyArmstrong 《世界电子元器件》2004,(7):38-39
许多微处理器和数字信号处理器(DSP)需要一个核心电源和一个在启动期间必须进行排序的输入/输出(I/O)电源。如果未经过适当的电源排序,可能发生闭锁或过流,从而损害微处理器的I/O端口或诸如存储器、逻辑电路、现场可编程门阵列(FPGA)或数据转换器之类支持设备的I/O端口。为了确保在主电源电压未被适当偏置之前I/O负载不被驱动,对核心电源电压和I/O电源电压进行跟踪是必要的。 相似文献
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By means of exact conformal mapping method we have defined character of dependence of squares amounts of angular part of film
element on angled part dimension. We propose relations, approximating obtained dependence. Calculation results and experimental
researches of large-scale models are represented. 相似文献
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Moshrefzadeh R.S. Radcliffe M.D. Lee T.C. Mohapatra S.K. 《Lightwave Technology, Journal of》1992,10(4):420-425
The temperature dependence of refractive index of polymer films was determined for a number of slab waveguides by a grating coupling method. This dependence was examined as a function of parameters such as molecular weight and glass transition temperature of the polymer. Temperature-induced changes in N TE-N TM , N being the effective index, were studied systematically for different slab waveguide compositions. It is shown that with proper device design and choice of polymeric materials, thermal effects can be reduced 相似文献
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The article describes a model representation of radar probing data in form of a mixture of background and target samples, which is the sum of two random variables with very different parameters. For model development we research the behavior of the central moments of the distribution mix without assuming the distribution law form. An example it is described the detection of the signal at the output of compression system of chirp ionosonde. 相似文献
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解决IP网QoS问题是目前通信领域的研究热点之一.虽然研究已经取得了一定的进展,但人们对于IP 网QoS本身的含义及相关的问题还有着不同的理解.本文将从IP网QoS的定义入手讨论相关的一些问题以及解决IP网QoS问题所做的各种努力. 相似文献
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《Proceedings of the IEEE. Institute of Electrical and Electronics Engineers》1968,56(6):1024-1032
Assuming that visual responses are due to the action of particles on the membrane of the visual cells, the stochastic variability of the response should be a function of the number of particles producing it. Quantitative predictions can be made with the aid of a model proposed in previous articles. It is found that responses produced in visual cells of Limulus by absorption of a single photon have the stochastic properties which would be expected if the response to one photon were brought about by 25 particles. It is concluded from this that the processes leading to visual responses produce multiplication of particles. The effects of temperature and of metabolic poisons suggest that these processes are of chemical nature. 相似文献
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近红外光谱技术在水果品质无损检测中应用的研究与现状 总被引:6,自引:0,他引:6
简单概述了我国水果产业的发展现状,着重阐述了国内外利用近红外光谱技术进行水果品质无损检测的最新研究进展,分析了当今研究中存在的问题,并对利用近红外光谱技术进行水果检测的前景进行了展望,提出了一些建议。 相似文献
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上市公司为了增强市场竞争力,不断扩大生产规模,追求规模经济,但是由于我国较低生产力水平、政府干预、体制等原因,上市公司的规模经济效果并不明显。同时,20世纪90年代以来,科学技术的日益发展,改变了企业发展的外部环境和条件,使得规模经济的实现方式发生了新的变化。在信息化时代下,规模经济理论需要进一步创新和拓展,企业按照新形势来选择合适的经济规模。 相似文献