基于C/S构架的分布式计算机过程控制实验装置的设计

网络化控制式自动化控制系统的一个新的发展方向.设计一个实验室控制装置的网络控制系统.系统设计中采用C/S构架(客户机/服务器构架),利用VB开发并利用TCP/IP协议实现了系统的远程控制.服务器与客户机之间利用TCP/IP协议中的UDP协议进行通信,实现校园网上的过程控制实验.图1为系统总体方案图.     

基于ASP.NET和移动andriod平台的物联网系统

为了解决工厂内众多设备相互间无法通信交互的问题,提出了基于ASP.NET和移动andriod平台的物联网系统,实现设备与设备、设备与服务器、移动终端与服务器的通信交互.首先基于ASP.NET在服务器端开发物联网系统网站,该网站通过局域网和Socket通信与各个设备相互连接的同时,对设备反馈的状态信息进行智能分析,并进而控制各个设备.然后在各个设备端的应用软件加入Socket通信功能,支持与服务器的通信.最后在移动端基于Andriod平台和Java语言开发APP,通过无线局域网实现移动端与服务器的通信.实验测试结果表明:所提物联网系统可以实现对设备、服务器的连接和智能运作,为智能工厂的推进奠定基础.     

基于RTW的实时控制系统参数在线调整

基于RTW的外部模式,实现了实时控制系统的在线参数调整.通过将控制系统的控制算法和参数调整分为两个模块,基于服务器/客户机的通信原理,将参数调整作为客户机的请求,发送给作为服务器实时运行的控制器部分,实现了实时控制系统的在线参数调整.     

网络信息安全防范客户机与代理服务器间通信的设计与实现

代理服务器是一台连接在客户端与Internet间实现代理功能的服务器。本文介绍了一个用vc 6.0设计的通过Socket技术实现代理功能的代理服务器。其中,重点介绍客户机与代理服务器的通信实现。计算机安全的目的是通过适当的选择和申请的保护措施保护计算机资源。因特网安全保护计算机资源免受风险和由于连接到因特网产生的威胁。     

基于C／S构架的分布式计算机过程控制实验装置的设计

网络化控制式自动化控制系统的一个新的发展方向。设计一个实验室控制装置的网络控制系统。系统设计中采用C／S构架(客户机／服务器构架)，利用VB开发并利用TCP／IP协议实现了系统的远程控制。服务器与客户机之间利用TCP／IP协议中的UDP协议进行通信，实现校园网上的过程控制实验。图1为系统总体方案图。     

基于MODBUS TCP/IP协议的海上油田发电机组网络监控系统

海上采油平台原有的发电机组检测装置因其功能单一、且无法进入监控调度级的局域网等原因而需要升级。设计了一套基于OPC通讯的多控制器、多客户机的网络监控系统,介绍了在C/S构架下MODBUS TCP/IP技术在系统中的通信原理和实现方法。以KEPServerEX作为OPC服务器,在机组检测装置与WinCC软件(OPC客户端)之间建立通信,并以安装KEPServerEX软件的工业控制计算机为C/S服务器,将各客户机和服务器相连接,MODBUS TCP/IP协议与OPC技术的应用,提高了通信的速度及系统的扩展性。实际运行表明,基于MODBUS TCP/IP和OPC技术的多WinCC组态与多发电机组检测装置间通信实时性与稳定性良好。     

基于多语言编程的拨号上网管理方法与实现

通过对Windows API中网络服务函数(RAS)的调用,深入Windows内核,实现了应用程序对系统"网络与拨号连接"的直接控制.并利用VC 将其封装在动态连接库中,然后再通过Delphi的套接字机制在局域网内服务器和客户机之间建立起一种通信模式,最终实现了用户在客户端对服务器拨号连接的间接操作和自动管理.当服务器端应用程序处于后台运行时,客户端用户在本地机上就可通过发送各种命令及参数对服务器端的RAS连接进行直接操作,同时服务器端应用程序还可进行自动管理,为RAS的维护带来了很多方便.     

用套接字实现客户机时钟的自动设置

分析了网络环境下基于TCP／IP协议的能信应用程序间交互的最主要也是最典型的模式－－客户机／服务器模式,并通过一个利用网络编程界面——套按字来实现客户机在启动时向服务器询问系统当前时间的实例程序,阐述了该模式下2个应用程序是如何实现通信的。     

基于WiFi的蜂窝式多路继电控制系统

通过手机或PC,访问继电器群的web服务器,实现电源状态、灯光音响等设备的远程管理.该方式改变了传统继电器采用can总线等通信模式,在各控制模块相对独立的前提下,机电状态的控制联入互联网.这种无线蜂窝式多路继电器控制方法具有施工方便、维护成本低、管理方式人性化等优势.     

数控设备通信连接——现场信息管理系统的研究

针对江西工业职业技术学院原数控设备利用效率低的现状,进行了一系列的研究,利用现代的通信管理技术,实现数控机床的共享管理,使有限的数控设备与众多的计算机有机地连接起来,达到数控教学改革的目的.     

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.     

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.     

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.     

A computer generator for randomly layered structures

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

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

Jane Eyre——A Feminist In The 19th Century

In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.     

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-