风电安装船嵌入式升降监控系统的开发

为实现对风电安装船升降过程的远程监控,本文以移动终端作为上位机,西门子S7-1200系列PLC作为下位机开发了风电安装船分布式升降监控系统.下位机PLC基于USS协议实现对现场变频器的控制,基于Modbus协议与现场数据采集模块通讯,实时采集现场数据,下位机PLC负责对风电安装船升降过程的实时控制;上位机移动终端负责过程监视和人机交互,操作人员通过上位机移动终端对风电安装船升降过程远程监控.上位机与下位机之间通过TCP/IP协议进行通讯.系统试运行表明,该系统运行稳定,操作简单,能够满足风电安装船升降过程远程监控的要求.     

基于PC-PLC网络的立体仓库自动作业监控系统的研究

以立体仓库自动作业系统为背景,重点对其监控系统进行研究,构建了基于PC-PLC网络的立体仓库自动作业监控系统,并模拟工业现场进行了调试。通过PROFIBUS现场总线将监控计算机、上位机PLC和下位机PLC连接成一有机整体;并应用工控组态软件WinCC对系统各组件进行硬件组态;采用PROFIBUS总线进行监控机、上位机和下位机之间的数据通信,实现了对立体仓库(AS/RS)自动作业的监控。现场调试证明,该监控系统界面友好,控制安全可靠,精度高,数据存储量大,数据传输正确,且功能多、使用方便简洁。     

电动汽车试验运行参数监控系统研究

在电动汽车的研发过程中,需要对车辆及关键零部件的运行状态信息进行实时采集和监测,因此设计开发了电动汽车试验运行参数监控系统．首先在下位机开发数据采集器,对车辆信息进行实时采集;然后采用无线通讯技术将下位机采集的数据传给上位机,在上位机实现远程监控及信息管理．实车测试结果表明该系统能够准确、可靠地完成实时数据的采集、传输和管理,具有优良的性能．     

水泥厂实时工况监控管理系统

阐述了由ＰＣ（个人计算机）和ＰＬＣ（可编程逻辑控制器）构成两级微机监控管理系统的理论和方法．系统由下位机ＰＬＣ（ＩＰ１６１２）在现场采集全厂各车间的设备运转状态数据，然后经串口通讯的方式实时地传送至上位机ＰＣ（８０３８６）．在上位机上以车间为单位分画面显示全厂的工艺流程模拟图，并在图上根据下位机传送来的数据实时动态地显示各设备的当前运转状况．该系统为某白水泥厂设计开发，取得了良好的经济效益和管理效益．     

CAN总线的电机组远程控制

针对现场分布式电机的运行特征,设定远程监控系统的检测要求和控制目标,采用具有CAN总线功能的上位机对电机状态进行检测和控制,设计相应的硬件控制电路.结果表明:上位机采用计算机能将远程现场的电机状态显示在监控器上,并发出控制命令和驱动报警电路;信令传输采用CAN总线结构,使通信具有很强的纠错功能和抗干扰能力;下位机采用单片机作为现场监控,能灵活控制电机的运行状态;传感器采用霍尔元件能有效地将电机的运行情况传送给单片机;直流电机驱动采用PWM电路,交流电机驱动采用SPWM电路,能够实现对电机的稳定调速.该系统对远程控制研究具有一定的参考价值.     

基于以太网温度采集与控制系统的设计与实现

采用AVR Mega系列的ATMega32微处理器作为下位机的核心,RTL8019AS模块作为以太网接口。下位机用C语言编程,从温度传感器DS18B20中获取温度信号。下位机的通信协议采用精简的TCP/IP协议栈—uIP 0.9。在下位机上实现了简单的Web服务功能。上位机通过以太网和下位机通信,将数据显示在可视化监控界面上,同时绘制数据的动态曲线图。经过实验表明系统使用达到了预期效果。     

医院护理智能化监控系统的设计

系统采用分布式计算机控制系统结构,利用RS485总线实现医护工作站(上位机)和病房监控系统(下位机)之间的信息传输。下位机以单片机AT89C51为核心,实现对患者的血压、心率和体温检测以及滴速检测和控制;监测结果显示并发送上位机。上位机以广泛使用的微机作为多床位的监控中心;建立医护数据库;接收从下位机传输的滴速、血压、心率、体温等数据,并显示、保存、分析统计,而且可以设定滴速对下位机实施控制。该系统的研制,将进一步提高医院护理和管理的自动化水平。     

基于TCP／IP协议的惯性台架远程测控系统的设计

惯性台架传统的测控系统采用一台工业控制机直接与可编程逻辑控制器（PLC）和数据采集卡通信的单机模式实现惯性台架的测控功能。为了能在原有测控系统基础上方便有效地实现远程控制功能,设计增加一台远程计算机作为上位机,利用原有工业控制机作为下位机,通过TCP／IP协议实现上下位机的通信来完成远程控制的功能。     

工业PC和PLC通讯设计

在工业过程的计算机监控系统中，上、下位机既彼此独立，又相互联系，层次之间的通讯是一个关键的问题。本文是笔者在为某厂大型机床的计算机监控系统顺控部分研制工作的基础上，从硬、软件及通讯方式的选择等方面详细介绍了，由工业ＰＣ作为上位机，可编程控制器（ＰＬＣ）作为下位机的通讯设计。     

基于RS485总线网络的烤烟集中监控系统

设计了一个基于RS485总线网络的烤烟集中监控系统,上位机和下位机全采用单片机.上位机能远程监视和控制各下位机的温湿度数据.下位机采用X1228实时时钟芯片作时间系统和E2PROM存储器,用DS18B20数字温度传感器采集干、湿温度,并对烤房温湿度进行控制.下位机具有多曲线、自学习功能,能适应不同地域和季节的烟叶烘烤需要.     

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.     

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.     

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.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

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.     

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.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

橡胶颗粒沥青混合料低温抗裂性试验研究

以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.     

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.