基于嵌入式系统新型车辆行驶记录仪的硬件结构和软件设计

设计了一种基于嵌入式系统的新型车辆记录仪，介绍了该记录仪的一些主要功能，描述了其软硬件组成．通过阐述该记录仪工作时的硬件功能及数据的采集、处理、存储过程，显示出该记录仪相比于其他同类产品具有高效安全和实时处理大批量数据的功能．     

煤气压力自动记录仪的误差分析

煤气压力自动记录仪能自动记录煤气压力的变化，是煤气调压站的必备仪表。阐述了煤气压力自动记录仪的工作原理，分析了引起记录仪误差的主要原因，提出了消除或减少误差的几种方法。     

DT5智能电压记录仪的研制

阐述了ＤＴ５智能电压记录仪的工作原理、性能和主要技术参数，同时介绍ＤＴ５智能电压记录仪的硬件组成和软件设计．     

DT5智能电压记录仪的研制

阐述了ＤＴ５智能电压记录仪的工作原理，性能和主要技术参数，同时介绍ＤＴ５智能电压记录仪的硬件组成和软件设计。     

应用FLASH闪存的动态参数记录仪设计

本文介绍了大容量闪存在参数记录仪中的应用。在简单介绍参数记录仪的基础上详细描述了K9F1G08UOA芯片的结构特点及主要功能,通过运用单片机AT90S8515及CPLD对闪存K9F1G08UOA进行控制,实现了对闪存的读取、编程、擦除的操作．完成了数据的实时记录、数据采集等功能,使得该记录仪具有容量大、低功耗、集成度高等优点,在未来有更好的发展前景。     

基于霍尔转速传感器的速度信号采集电路的研究与设计

介绍了一种基于霍尔转速传感器的速度信号采集电路，电路主要为汽车行驶状态记录仪提供转速信号，通过对霍尔转速传感器信号进行放大整形，使处理后的信号转换成标准的方波信号。实际功能验证表明，该转速信号完全能满足汽车行驶状态记录仪的设计需要。     

无人机载数据记录仪软件的实时性分析与优化

为了给飞行安全、 维护管理以及训练提供重要数据保障, 设计了无人机载数据记录仪, 对该记录仪软件的实时性进行了研究。对影响数据记录仪软件实时性的因素进行分析, 根据所需记录数据的帧长度及中断频率得到数据记录仪对中断响应延时的要求; 利用软件设置GPO（General Purpose Output）翻转, 结合示波器测得存储单元在不同寻址方式下的响应时间延时; 再根据寻址响应延时及乒乓缓存深度关系得到最优记录模式。通过搭建测试平台对优化前后的数据记录仪软件进行测试。结果表明, 优化后的数据记录仪最短中断响应时间间隔为56 μs。该数据记录仪能实时记录所有中断源数据, 丢帧率为0, 满足无人机对数据记录仪的高实时性要求。     

基于虚拟仪器技术的海量数据存储记录仪

记录仪是重要的二次仪表,用于工业自动化监控系统,也可以用于高速现场采集为后续分析准备数据.虚拟式海量数据存储记录仪是在克服传统记录仪缺点的基础上,结合虚拟仪器技术,开发出来的一种新型的记录仪.作者对系统原理、硬件结构及软件设计进行了详细的论述,并给出了一个应用实例.该仪器具有成本低,易携带,操作方便的优点,满足了大多数行业对记录仪的需要.     

光照水电站大坝工程灌浆自动记录仪的使用管理

本文主要阐述了灌浆自动记录仪在贵州北盘江光照水电站大坝工程中的使用管理办法,可为同类型工程借鉴.     

U盘存储与转存模块的设计与实现

本文主要介绍了基于ARM和GPS的数据采集记录仪中的U盘存储与转存模块的设计与实现.该数据采集记录仪以32位ARM7微处理器LPC2220为硬件平台,以uC/OSII嵌入式实时操作系统为软件环境,实现了对复杂工业信号的采集、记录以及对此过程的控制.该模块既能对数据采集模块采集的数据进行直接存储,也能对flash存储模块中的数据进行转存;同时利用GPS全球定位系统技术实现多仪器间的精确同步.该数据采集记录仪具有良好的人机交互性、稳定性、高效性.     

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.     

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     

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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