DJ-H多通道主从式核料位计分析

探讨了一种适用于电力、冶金、化工等领域的新型仪表DJ-H多通道主从式核料位计的工作原理和系统结构,利用多CPU的技术对同位素仪表的技术性能进行改进,使其在并行处理和实时采集数据方面具有明显的优势,能极大地提高仪表的稳定性和可靠性.     

多个数字仪表字符串区域的定位和识别研究

根据待识别图像中多个仪表的特点,运用边缘检测技术、数学形态学方法、连通域标记法等来定位出多个仪表待识别字符串区域,并运用BP神经网络来识别.经过试验,能准确定位出各个仪表字符串区域,其识别率也达到了95%.     

自动化仪表在采油工艺中的应用

随着自动化技术的发展,自动化仪表已广泛应用于大庆油田的各个生产环节.本文介绍了自动化仪表在采油工艺中的应用后对提高生产管理水平,产生较大经济效益等方面的相关内容.     

化工仪表及自动化教学改革探讨

化工仪表及自动化是一门综合性的技术学科.随着电子、计算机、控制技术和理论的飞速发展,化工仪表及自动化课程的教学理念、教学内容、教学方法和教学手段等需要全面调整.结合学科自身特点和相关的教学改革成果,对化工仪表及自动化课程教学中存在的问题提出解决的方法和建议.化工仪表及自动化的教学改革有利于培养适合社会发展要求的创新型人才.     

混合动力汽车真彩液晶数字仪表软件设计

设计了混合动力汽车真彩液晶(LCD)数字仪表的软件流程.该仪表系统具有仪表显示、故障诊断显示、车辆行驶参数记录与分析、数据保存与回放等功能,实现了汽车仪表的数字化与智能化.该数字仪表经扩充后兼具整车管理系统、行驶记录仪、信息媒体播放器等功能.     

浅谈能源数据采集系统现场仪表的日常维护

能源数据采集系统是一种综合运用了仪表测控技术和计算机网络技术等多种技术的系统。要保证系统能够稳定可靠良好地运行,维护好现场仪表是至关重要的。本文联系理论,针对实际,总结出了一套现场仪表的维护、分析方法。     

ＦＦ超声波料位计

超声波料位计是一款符合ＦＦ通信协议的智能超声波料位计。ＦＦ通信协议是国际上公认的下一代智能过程控制仪表通信协议，实现了全数字通信，是仪表通信技术的一次飞跃。智能超声波料位计采用先进的回波窗口锁定技术、光电隔离技术、温度补偿技术，大大提高仪表抗杂散回波的干扰能力，提高了仪表的精度和稳定性。本仪表解决了用双ＣＰＵ实现ＦＦ协议的问题，缩短了ＦＦ协议的开发周期。与国内同类仪表相比，本仪表具有盲区小，量程大，精度高，智能化等特点。在国内处于领先水平。     

不锈钢炼钢上料系统自动化仪表施工技术

总结了不锈钢炼钢上料系统自动化仪表的施工技术,涉及电容式料位计、导波雷达料位计、称重传感器等典型仪表。     

基于GPRS的流量计数据采集系统

介绍了GPRS通信技术在流量计数据采集系统应用中的硬件和软件实现,讨论了系统的结构组成及动态域名和端口映射等技术的应用.针对流量计数据通信接口和GPRS通信技术的特点,采集同一GPRS终端下的仪表数据.与一般每次一台的设计方法不同,提出了数据中心采用打包发送指令及GPRS终端打包返回仪表数据的新思路,并在已有通信协议的基础上专门设计了自己的协议,增加了通信系统的效率和稳健性.提出了支持各种不同通信指令系统的流量计或其他仪表可方便加入一个数据采集系统的方法,使系统具有很强的通用性.     

现场总线仪表技术在水泥生产线上的应用

对ABB公司总线仪表的总线技术特点及现场应用做了详细的分析，并对总线仪表的具体应用、组态和在线修改等做了详细的介绍。采用总线仪表可获取仪表的工作状态、实时数据及报警信息等，这对水泥生产线的工艺改进和调度决策起到重要作用。     

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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