工业以太网在工程流水线自动化控制系统中的运用

在工程流水线自动化控制系统中工业以太网逐渐显示出了重要的应用价值,该文介绍了工业以太网的基本知识,进而讲解了工业以太网在工程流水线自动化控制系统中的运用过程,包括设计工程流水线自动化控制系统结构、设计系统控制模式、设计PLC自动系统、设计工业以太网网络系统、设计系统组网方案,对工程流水线自动化控制系统的运行提供了重要的借鉴意义。     

发动机活塞环自动包装流水线的创新设计

用系统论方法对活塞环自动包装流水线的设计进行了系统分析，着重从包装功能方面阐述了系统的分解、子系统的匹配和协调。     

主从式微机数据采集处理系统的设计与实现方法

本文提出一种主从式微机数据采集处理系统的设计与实现方法。该系统由两级微机组成,主机为Z—80最小系统,从机为IBM PC/XT或兼容机。主从机之间通过共享RAM进行并行数据传输。该系统具有一定的通用性,文中叙述了系统对40个Ⅰ位的生产流水线上的产量、返工量等数据进行采集、处理、存贮及生成各种报表供查询、显示和打印输出的具体设计与实现方法。     

8＊8VLSI离散余统变换芯片的设计

设计完成了二维８×８ＤＣＴ／ＩＤＣＴ处理器系统。该系统由两个一维ＤＣＴ／ＩＤＣＴ功能块和一个矩阵转换存储功能构成，采用并行结构，流水线操作。根据分布算法，用存储器查表的方法取代了乘法操作。     

基于TwinCAT Vision的自动插磁视觉定位系统设计

为解决传统的视觉系统与组装流水线的流程控制分属于两套不同系统的问题，在通过串口或TCP/IP进行通信时易导致停机、停线、减慢生产节拍等问题，利用TwinCAT Vision机器视觉模块设计了一套流水线上的转子视觉定位系统，系统的图像处理部分被添加到整合PLC(programmable logic controller)运动控制的通用控制平台TwinCAT上，实现与整个转子装配流水线中PLC运动控制模块的无缝连接。视觉定位系统通过TwinCAT Vision采集流水线操作台上的转子图像，传递到实时内核模式下的PLC机器视觉与工艺流程控制系统中。研究表明，与传统机器视觉方案相比，该视觉定位系统减少了通信环节，提高了系统稳定性，节省时间约26.2 ms,效率提高96.3%左右，有效缩短了检测环节的用时。     

8×8VLSI离散余弦变换芯片的设计

设计完成了二维８×８ＤＣＴ／ＩＤＣＴ处理器系统．该系统由两个一维ＤＣＴ／ＩＤＣＴ功能块和一个矩阵转换存储器功能块构成，采用并行结构，流水线操作．根据分布算法，用存储器查表的方法取代了乘法操作．给出算法、系统框图和时序图，对各个功能块进行了设计．采用Ｖｅｒｉｌｏｇ－ＸＬ语言编写了程序，完成了对主要功能块的模拟．     

流水线技术在PLD设计中的应用

本文通过阐述流水线工作原理,并将其用到ＰＬＣ设计中。在ＰＬＣ设计中使用流水线技术,能够提高系统速度,用八位全加器的工作,说明了流水线技术在ＰＬＤ设计中的应用。     

基于流水线技术的Montgomery模乘器优化设计

基于高基FIOS算法，采用流水线技术实现Montgomery模乘器的硬件设计。并讨论流水线级数的选取对模乘器的速度、面积的影响，并推导出最优化流水线级数选取的公式。通过仿真实验证明了设计的优越性。     

一种高性能网络控制器芯片的设计与应用

介绍了一种采用二级流水线和ESFR方法设计的高性能8位网络控制器芯片,给出了芯片的系统架构、特性和子模块的设计方法,芯片采用0.25 μm CMOS工艺成功流片,最后应用这款芯片进行系统开发.     

基于计算机视觉技术的小尺寸机械零件的尺寸测量系统研究

利用计算机视觉技术解决工业现场皮带流水线上大批量的小尺寸机械加工零件尺寸的测量方法,利用计算机视觉技术结合流水线现场需要的实际情况构建小尺寸机械零件的尺寸测量系统。在对测量系统进行系统功能分析和总体设计的同时,根据现场工况需要对硬件系统进行了设计。     

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.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

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