直流采样集中式变电站微机监控系统设计探讨

本文完成的是以STD总线工业控制机为核心的单CPU直流采样集中式变电站微机监控系统.该系统属于总线结构的微机监控系统的概念,使用一台微机构成的微机监控系统.全部功能都集中在这台总线结构的计算机上实现.其主机系统STD总线各模板再接上一块变电站现场模拟板便构成了本监测系统的硬件部分.软件部分采用汇编语言编写,并运用编程技巧提升处理速度,对多个处理任务使用中断或多重中断,用子程序模块完成各种功能等来达到监测要求.最后采用了由EIA公布的串行通信接口RS-232C标准成功实现了两台机的通讯.系统将变电站的监控系统、信号系统一体化,既能达到无人值班要求又能兼顾少人的值守情况.     

管理多台微机的自动控制系统

本系统用一台主控微机控制管理多台被控微机（最多可达254台）。被控机只要有普通RS－232串行口即行。通讯波特率为9600bps，最长距离为60米，不用调制解调器，而是采用专门研制的电路板驱动放大数据信息，使通讯质量稳定可靠。本系统性能价格比高，软件稍加修改，系统可适用于多种场合。     

CHXP-1型试验台用微机系统抗干扰措施

CHXP-1型试验台是按载荷谱对小型工程机械传动系进行寿命试验和性能试验的装置。为使所选用的MDR-Z80Ⅱ型微机系统能安全可靠而稳定地运行,设计了该微机的抗干扰系统及具体的抗干扰措施。     

企事业供用电微机监控系统

描述了一种专用于工厂供用电实时监控和自动化管理的微机系统。该系统由一台主微机和一台通讯控制器及多台智能化远动终端按分布式微机系统结构组成,并配有功能齐全的软件。对工厂电网上千个参量实现了实时监测、调控和自动化管理。连续工作时间超过12000h,无故障。     

微机继电保护设备抗干扰措施在禹门河水电站的应用

微机继电保护装置与以往的电磁继电器保护相比,它的抗干扰及系统的稳定性对电厂的安全生产起着主要作用,针对现场环境可能的干扰大、污染重、雷电干扰频繁等情况,禹门河水电站在设备订货之初就向供货单位要求微机继电保护装置要采取多种抗干扰措施。本文介绍微机继电保护设备抗干扰措施以及在禹门河水电站的应用。     

微型计算机软件抗干扰技术的应用

介绍在提高硬件系统抗干扰能力的同时，如何利用软件抗干扰技术的特点，即设计灵活、节省硬件资源，来提高微机测控系统的可靠性．本文以TP TSD十二位6路转换器板为例，介绍对微机系统软件抗干扰方法实现进行研究．     

大庆油田电网微机保护装置的抗干扰措施

随着电子技术在继电保护专业领域的应用,微机保护的抗干扰问题也越来越突出。本文结合大庆油田的实际情况,从微机保护装置的软件、硬件及变电所设计等方面,对微机保护装置的抗干扰措施进行了总结分析,对提高大庆油田电网微机保护抗干扰水平具有一定的指导作用。     

微机控制系统中的干扰及抑制

分析了干扰对微机控制系统的影响及其严重后果,认为必须综合应用软件和硬件抗干扰措施．以保证微机控制系统长期、可靠、安全、稳定地运行。     

大庆油田电网微机保护装置的抗干扰措施

随着电子技术在继电保护专业领域的应用,微机保护的抗干扰问题也越来越突出.本文结合大庆油田的实际情况,从微机保护装置的软件、硬件及变电所设计等方面,对微机保护装置的抗干扰措施进行了总结分析,对提高大庆油田电网微机保护抗干扰水平具有一定的指导作用.     

微机控制防盗监控报警系统

介绍微机控制防盗监控报警系统的工作原理，系统组成，控制软件，抗干扰措施及发展设想，运行结果表明该系统功能强，灵敏度高操作方便。     

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