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移动机器人多路超声波传感器分别与中央处理器连接存在着数据线过多、中央处理器负担过重的问题.因此提出了基于CAN(Controller Area Network)总线的测距系统,设计了机器人的超声波测距系统的CAN总线硬件节点和软件结构,包括SJA1000CAN控制器及其初始化,CAN控制器数据接收程序和CAN控制器数据发送程序,并且讨论了数据发送过程。 相似文献
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本文研究了TMS32lf2407 DSP控制器中CAN模块的通信原理,介绍了一个利用DSP的CAN模块开发的CAN总线通信数据采集系统,实现多路、多现场的数据采集与监控。系统采用光纤CAN(Fiber-CAN)总线网络,有效提高CAN总线网络抗干扰能力,保证CAN总线网络正常运行。 相似文献
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基于CAN总线的计算机测控系统 总被引:2,自引:0,他引:2
采用CAN总线技术,成功地研制了CAN总线计算机测控网络系统,该系统由主计算机节点和多个监测节点组成,很好地实现了CAN总线工业测控网络的数据通信和现场监测,主节点监督和管理所有监测节点,监测节点测量现场生产过程参数,并详细阐述了主节点与监测节点之间的通信原理和部分通信程序流程图。 相似文献
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变电站绝缘在线监测技术是近年来的研究热点,特别是多设备外绝缘的综合监测技术是研究中的难点。本文提出了一套基于虚拟仪器技术和CAN总线技术的变电站多设备绝缘综合在线监测系统。以CAN现场总线为基础,研究其在变电站综合自动化系统中的应用原理和实施方法,针对传统测控网络存在的缺陷,设计了一种由CAN总线组成的新型测控网络,应用虚拟仪器技术实现多设备多点循环检测、数据分析、趋势查询、远程监控等功能。 相似文献
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通用CAN节点电路的设计及其应用 总被引:1,自引:0,他引:1
介绍一种通用CAN节点的电路结构、相关应用程序及在工业中频感应加热设备控制现场总线中的应用。多功能CAN节点线路板上包含11路12位模数转换,8路开关量输入,3路开关量输出,1个RS—232S微机通信串行口,1个CAN通信口,可作为通用CAN接口用于自动控制系统中数据采集器及上位微机的转换接口。 相似文献
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为了使振弦传感器监测装置实现简化现场布线、直接输出被测物理量,设计了一种基于单片机和CAN总线的振弦传感器监测装置。文章介绍了总线式振弦传感器监测装置设计的实际意义。根据工程实际,设计了监测装置的总体结构。通过查阅文献掌握了振弦传感器的工作原理和CAN总线多节点通信的方法。设计了CAN总线节点收发硬件电路并给出了总线式振弦传感器监测装置的程序流程图。最后给出了设计的总线式监测装置的实验效果图。总线式振弦传感器监测装置将振弦式传感器、单片机以及CAN总线结合在一起,提高了测量频度、简化了现场布线。用于具有测量频度高、测量距离远等特点的多种振弦传感器监测的工业领域。 相似文献
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Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness. 相似文献
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Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women's language from these perspectives: pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women's language, more attention should be paid to language use in social context. What's more, the linguistic phenomena in a speaking community can be understood more thoroughly. 相似文献
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理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。 相似文献
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As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death. 相似文献
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Miao Maosheng 《华南师范大学学报(自然科学版)》2014,(6)
正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula- 相似文献
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Yang Weitao 《华南师范大学学报(自然科学版)》2014,46(6):137-138
We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re- 相似文献
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Bernard Kirtman 《华南师范大学学报(自然科学版)》2014,(6)
正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that 相似文献
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Michael Springborg 《华南师范大学学报(自然科学版)》2014,(6):136
For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the 相似文献
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Zhu Chaoyuan 《华南师范大学学报(自然科学版)》2014,46(6):140-140
Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of 相似文献
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《上海师范大学学报(自然科学版)》2014,(5):550
<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with 相似文献