采煤机自动测试系统实现关键技术分析

本文利用运用先进的测控技术针对较为落后的采煤机技术实现了基于微机控制的测试系统。重点分析测试系统的工作原理,并分别就测试系统中的液压系统设计、测试系统硬件设计和测试系统中软件设计进行技术分析。     

离心泵性能测试装置及其控制系统

设计一套离心泵性能测试装置及其控制系统。离心泵的流量、进出口压力、功率、转速、进出口调节阀的开度等采用单片微机检测,通过自动调节进出口阀控制汽蚀和流量。控制面板可同时显示所有参数,这些参数通过串行通讯输入PC微机,并由PC微机处理储存控制及绘制成性能曲线。试验装置能方便地实现离心泵的恒流输出、但压输出等各种功能。     

柴油机喷油规律的微机测试分析

提出了应用微机测试分析柴油机喷油规律的方法，介绍了该测试分析系统的装置原理、数据采集与分析处理的方法，以及微机系统软件设计框图。     

汽车交流发电机性能微机控制测试系统设计

介绍汽车交流发电机性能微机控制系统的一个设计实例,给出该测试系统的基本设计要求、总体结构及其机械与电控硬件、系统功能软件模块的设计方法,讨论该测试系统的调试和特点。该测试系统投入试运行后,经有关厂家质检部门对其性能测试的结果表明,其各项技术性能指标可与进口设备媲美,解决了汽车发电机性能传统测试方法所存在的精度低、效率低、数据不能存贮等问题。     

微机单车试验器的研制

针对铁路货车制动性能测试,简单介绍了测试工艺标准,研制了微机控制单车试验器,介绍了微机单车试验器的软硬件结构与功能.经实际比较检测,该装置的功能完善,自动化程度高,测试结果准确可靠.     

一种微机控制的车辆制动机试验器

为提高铁路车辆运行的安全稳定性,实时记录测试结果,设计了一种采用微机控制的车辆制动机试验器,对制动缸活塞行程自动测量,采用电磁阀组代替操纵阀手把位,实现了测试过程的自动化,动态显示车辆制动机试验测试全过程,自动化程度和测试效率高,测试结果准确可靠,为实现数据联网和科学管理提供了支持。     

OLED器件的IVL测试实验设计

文中介绍了一种微机控制下的电流-电压-亮度（IVL）测试系统的设计,该系统主要用于测试有机发光二极管（OLED）器件的电流-电压-亮度等光电参数,具有测试速度快和易于操作等特点;系统的研制成功可对OLED显示器件物理机制的研究提供测试手段。     

电动汽车车载微机测试系统的研究

本文在国家初步制定了电动汽车检测标准的基础上,对电动汽车车载微机测试系统进行了研究与设计.本文设计的测试系统侧重于动力参数性能测试和蓄电池运行参数测试两部分,优化了测量方法和程序算法,精选了适合微机系统的数据采集卡,大大提高了数据采集测量的精度和处理计算的速度,并采用功能强大的组态软件PCauto3.1开发了生动、逼真,可视化效果好的测试界面.     

微机控制速示仪的研制及其在实验心理学中的应用

本文通过介绍微机控制速示仪及其在心理学测试中的应用，说明将计算机引入实验心理学和教育统计学的必要性．文中介绍了微机控制速示仪的原理、功能和应用情况．     

外胎立体仓库微机管理和控制系统的设计

利用微机对飞机外胎立体仓库进行管理和控制,使仓库在管理和控制上完全实现了自动化。文中着重论述了微机管理和控制系统的控制原理和控制方法,对接口电路和控制软件的设计作了深入分析,提出了微机在工业控制中的抗干扰措施。     

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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