CAN总线在移动机器人中的应用

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。     

基于CAN总线的矿井通风监测系统的设计

为监测矿井通风状况,设计了基于CAN总线的矿井通风实时监测系统。主要介绍了CAN总线监测节点、PCI-CAN总线智能适配卡以及监测系统软件的设计。系统通过CAN总线与监控主机连接进行通信,完成对大规模节点温度、风速等数据的实时监控。该系统较传统矿井监测系统传输距离远、监测节点数量多、实时性及可靠性强。     

CAN总线在DSP数据采集系统中的应用

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。     

基于CAN总线的计算机测控系统

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。     

基于虚拟仪表和CAN总线的变电站绝缘检测系统

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。     

车辆总线信号光电转换技术的研究

针对CAN总线通信方式的半双工和光纤传输全双工的转换问题,提出了一种基于等待接收和控制发送的机制。采用这种机制完成了光电转换电路的设计,在CPLD的控制下实现了半双工和全双工传输模式的转换,进而完成信号的光电转换。根据车辆总线信号电气特点以及光信号自身的特性,设计了车辆总线中数字信号在收发端的传输模式,完成光电转换的同时进行有效传输。搭建了整体的光电系统,通过测试系统能够传输CAN总线信号的最高速率为1 Mbps,并且长时间工作稳定,达到设计要求。     

通用CAN节点电路的设计及其应用

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。     

基于CAN总线的楼宇多路智能报警系统设计与实现

本文以CAN总线协议为主要基础,设计了一种基于CAN总线的多路智能报警装置。该文讨论了系统的整体结构和设计过程,给出了硬件线路和系统的软件框图。该电路完全通过运行调试。     

总线式振弦传感器监测装置的设计

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。     

CAN总线协议实现方法研究

在CAN总线通信网络的建设中，CAN总线控制器实现了CAN总线协议的大部分内容．首先介绍了CAN总线的概况，简单介绍了CAN总协议的内容，详细介绍了有限状态自动机的组成特点以及利用有限状态自动机实现CAN总线协议的方法．最后根据有限状态自动机的设计要求，详细介绍了CAN节点的各种状态以及各个状态之间的转换关系．     

Markedness and its Interpretation in Language Use

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.     

Features of Women's language

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.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

低渗透非均质砂岩油藏启动压力梯度研究

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。     

On Tragic Consciousness In The Works By Ernest Hemingway

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.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

Achieving Unusual States of Matter Under High Pressure

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-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

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-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

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