利用MSComm控件实现与GPS接收器的串口通讯

串行接口由于其具有连接简单、使用方便、数据传递可靠等优点,在工业实时控制系统中得到了广泛应用。探讨了利用Microsoft Communications Control控件编写串行通信程序的方法,并结合开发实践,阐述了用VC＋＋语言实现了基于ActiveX技术的串行通信编程的一般步骤。     

多线程串行通信技术在发动机油门瞬态控制器中的应用

本文结合发动机油门瞬态控制器的开发实践,介绍和讨论了一种基于串行通信的实时控制与数据采集系统的设计和实现方法。为了解决串行通信实时性问题,采用了多线程设计思想,结果表明,应用程序运行效果良好,对实时串行通信软件开发具有实用意义和参考价值。     

实时控制系统MOXA多串口卡同步串行通信容错算法

针对高速实时控制系统中断响应延迟问题,以及MOXA C502多串口卡同步串行通信稳定性问题,提出一组纠错容错算法,解决GPS/B码误差对系统中断响应的影响,实现基于MOXA C502多串口卡的稳定可靠同步串行通信,在实际应用中取得理想效果。     

用Delphi语言实现上下位机的串行通信

介绍了Windows环境下在Delphi语言中利用TComm控件实现上下位机的串行通信编程，并给出了应用范例，此方法简单可靠，使用灵活，便于移植，且实用性较强，可供一般程序员在编写串行通信程序时参考。     

基于ARM处理器的UART设计

UART是用于控制计算机与串行设备的装置,在嵌入式系统中它操作简单、工作可靠、抗干扰强。本文介绍了一种近距离的通信方法．讲述了UART的原理和软件设计的改进,在ARM中采用串口通信技术,具有使用方便、程序简单、可读性好、工作效率高等优点,可以广泛应用于基于串行通信的各种场合。结果表明,此设计有助于提高数据传输的实时性。     

PC机串行通信

提出了一种用C语言实现PC机串行通信的方法,分析了PC机串行通信原理,采用计算机自身携带的RS-232C标准接口进行通信。该方法程序小,硬件连接简单,且可应用到PC机与单片机或其它仪器仪表的串行通信中去,因此具有较广的使用价值。实验证明该方法能实现PC机的可靠数据传输。     

单片机与微型打印机的接口硬件设计

本文设计了以AT89S52为核心的微型打印机接口硬件,介绍了AT89S52单片机接口转换电路及微打的串行通信方法,此方法也可应用于其它类型的微型打印机及串行通信场合。系统可以无须通过微机直接打印,具有硬件构成简单、成本低、通信可靠的特点。     

单片机与微型打印机的接口硬件设计

本文设计了以AT89S52为核心的微型打印机接口硬件,介绍了AT89S52单片机接口转换电路及微打的串行通信方法,此方法也可应用于其它类型的微型打印机及串行通信场合。系统可以无须通过微机直接打印,具有硬件构成简单、成本低、通信可靠的特点。     

柴油机微粒过滤器再生控制系统设计

针对柴油机微粒过滤器（DPF）难以实现自动再生问题,提出了利用AT89C52单片机实现可靠的DPF再生控制系统的解决方案,利用传感器和A／D转换电路设计了信号采集及处理单元,辅助设计了实时时钟电路和RS232串行通信电路,还特别设计了稳压电源模块．最后开发了系统软件,使系统能实行实时控制,保证了系统的自动化、智能化工作．实践结果表明该系统设计合理、运行可靠．     

利用录波技术查找串行通信故障

先简单介绍了查找串行通信故障的常规方法,并详细介绍了在使用常规方法失效的情况下所采用的一种新方法——利用录波技术查找串行通信故障。并结合工作实践详细介绍了该方法的具体操作及其使用经验。     

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.     

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     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

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     

Call for Papers

<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     

Journal of Donghua University ( English Edition) Contents of Volume 31

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