客车视听系统的CAN总线控制

在CAN总线和SAE J1939协议的基础上,利用客车上原有的CAN总线网络,设计了客车视听系统的新控制方案,实现远程控制,达到比较好的效果．     

HEV控制网络通信协议研究

为了适应混合动力汽车(HEV:Hybrid Electric Vehicle)电子技术的快速发展,根据混合动力汽车多能源动力总成控制系统的要求,设计了一个混合动力系统通信协议。采用CAN(Controller Area Network)总线标准完成系统各个控制单元的连接,软件采用SAE(Society of Automotive Engineers) J1939协议完成数据的装配和传送,并根据需要进行了CAN协议与J1939协议之间的转换。仿真实验结果表明,该通信协议能将物理层和数据链路层上的数据通信与应用层上的信息通信有机地结合起来,简单高效,有较好的应用前景。     

采用SAE J1939的CAN/LIN总线汽车内部网设计

以国产汽车为应用对象,设计以CAN总线为主、LIN总线为辅,并以当前应用最广泛的SAE J1939协议为主干协议的汽车内部通信网络,将汽车动力系统和车身控制系统的通信网络分成高速CAN网络、低速CAN网络和LIN网络三部分。选取Philips公司的P87C59等器件,设计了CAN、LIN总线节点、主控制器节点和相应的连接节点。此设计方案具有成本低、可扩展性高等特点,可作为适用于华晨、奇瑞、吉利等国产汽车内部网设计。     

重型拖拉机CAN通信网络设计

针对重型拖拉机众多电控单元之间需要实时信息共享的需求,设计了包含整机控制器、发动机控制器、变速箱控制器、电控提升控制器、精准作业控制器以及仪表等节点的整机CAN总线通信网络;基于SAE J1939协议和ISO 11783协议制定了拖拉机CAN网络通信协议;通过CANoe进行了整机CAN总线网络负载率的分析,确定了整机双...     

基于J1939的车载CAN总线模拟系统设计

针对机动车联网终端对于测试环境的需求,应用SAE J1939协议进行了车载CAN总线仿真环境的设计。系统由PC端上位机软件和CAN总线模块下位机组成。PC端上位机界面由跨平台特性优良的Qt Craetor设计开发,用于设定、显示仿真环境的车辆参数以及串口的通信;下位机方面通过MCU完成与上位机的串口通信以及通过CAN总线模块将仿真环境的车辆参数的传输到CAN总线上。经过测试,该系统工作稳定,满足本项目对于测试环境的要求,同时可以模拟普通的车载网络,具有一定的应用价值。     

基于控制器局域网络总线的发动机电子控制单元硬件在环试验台的通信系统设计

基于J1939协议的控制器局域网(controller area network,CAN)总线通信网络的开发一直是硬件在环通信平台的难点和重点,针对发动机电子控制单元(electronic control unit,ECU)硬件在环仿真平台的通信特点,应用NI VeriStand软件和NI PXI平台的CAN通信模块,构建了一套CAN总线通信网络。平台依据CAN2.0B规范并结合J1939高层协议构建硬件在环通信网络,实现ECU与上位机和组合仪表的CAN数据交互。试验台构建一套完整发动机CAN总线通信网络,完成发动机ECU硬件在环CAN总线信息收发解析、数据记录及组合仪表实时显示。     

采用SAE J1939的CAN/LIN总线汽车内部网设计

以国产汽车为应用对象，设计以CAN总线为主、LIN总线为辅，并以当前应用最广泛的SAE J1959协议为主干协议的汽车内部通信网络，将汽车动力系统和车身控制系统的通信网络分成高速CAN网络、低速CAN网络和LIN网络三部分。选取Philips公司的P87C591等器件，设计了CAN、LIN总线节点、主控制器节点和相应的连接节点。此设计方案具有成本低、可扩展性高等特点，可作为适用于华晨、奇瑞、吉利等国产汽车内部网设计。     

基于J1939协议的车辆通信系统的设计

提出了一种基于J1939协议的车辆通信系统的设计方案。该系统由发动机电子控制单元、防抱死制动单元、变速器单元组成。每个节点都由高速CAN收发器和集成了CAN控制器的STM32F103ZET6处理器构成。按照J1939协议应用层的规定,编写了相应的应用程序,实现了节点的地址声明及报文解析功能,完成了系统的测试。     

车辆底盘CAN总线系统的数字仿真及硬件实现

为形成汽车众多电控单元的数字化控制网络,研制cAN(控制器局域网)总线系统.采用SAE J1939通信协议,有针对性地设计了CAN总线通信系统,用于具有ABS(制动防抱死系统)、AT(自动变速器)、EMS(电控悬架)、EPS(电动助力转向系统)4个电控单元的车辆底盘;并使用CANoe软件数字模拟了总线的运行状况;使用PICl8F458微处理器完成CAN总线接口电路设计,对数字模拟的虚拟总线进行了硬件实现,并装车实测.试验结果表明,该系统工作稳定,抗干扰能力强,能满足实时通信及综合控制的要求.     

基于S3C2410的嵌入式Linux车载信息终端实现

随着人们对汽车安全性、舒适性要求的不断提高,汽车电子控制功能逐渐增多而复杂.针对使用传统单片机控制方法功能单一、灵活性差等缺点,提出了基于S3C2410和嵌入式操作系统Linux的车载信息终端解决方案.通过分析车载终端功能需求,实现了基于CAN(控制器局域网)和SAE J1939协议的汽车信号采集与解析、GPS(全球定位系统)定位信息采集与解析以及GPRS(通用无线分组业务)数据传输等功能模块的软件设计,并基于嵌入式GUI(图形用户界面)Qt/E设计了良好的人机交互界面.该方案功能丰富、操作简便、可移植性好,易于扩展.     

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.     

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     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

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