基于物联网监控的多台微型泵恒流控制系统设计

为满足液体送料系统中多种液体定量送料及实时远程监控的需求,设计一种基于C/S监控模式的多台微型泵恒定流量控制系统.介绍流量控制系统的设计方案,流量控制器通过以太网接口实现远程通信,通过CAN总线实现多通道流量信号的采集及微型泵驱动电机的速度控制,采用模糊控制算法实现流量闭环恒流控制,基于C/S模式实现微型泵流量的实时远程监控.试验证明系统模糊控制可以较好地实现液体流量的恒流闭环控制,同时C/S模式也很好地实现了流量的远程监控.该系统方案在实时监控多种液体定量送料场合有一定的参考及应用价值.     

基于GPRS的水厂实时远程监测系统

文章介绍的实时远程监测系统能实现工业现场实时数据采集、监控管理和远程数据传输与调度;自来水厂内计算机监控已自成系统,把厂内相关数据传输到远程控制中心也是其中的一个重要功能;通过比较几种常用通信方法,阐述在工业现场设备分布越来越广的趋势下,利用GPRS技术实现远程无线监控与调度的优越性.     

泵工况集中监控和管理系统应用

泵工况仪可以实时记录电潜泵运行参数,能够直观反映电潜泵工作状态、油藏参数变化。操作人员每日汇总和分析泵工况数据,由于无法实时监测,且每台泵工况历史数据需要存储卡导出查看,所以存在不能及时发现电潜泵异常状态的问题。利用RS485通信网络,实现对17台泵工况数据的集中监控和管理,为提升油井电潜泵管理水平提供借鉴。     

利用Modbus和OPC技术实现水电站数据通信

文章以某水电站计算机监控系统技术改造为背景,针对某水电站DCS系统的实时通信问题,采用Modbus协议和OPC技术,解决了监控系统中温度巡检表与WinCC的实时数据通信问题,扩展了现有DCS监控软件的监控范围.通讯系统利用现代通信手段,及时、准确、快速地传递现场各种控制信息,实现了在DCS集控室对PLC的监控和无人值守...     

DMF回收温度监测通信方案的设计

以二甲基甲酰胺(DMF)回收系统的自动化改造为背景,利用现场总线的高效性和可靠性,提出基于Modbus RTU协议的温度采集解决方法.并采用OPC技术实现数据与上位机软件——组态王的通信,解决了温度监测系统中温度巡检表与监控计算机之间的实时数据通信问题.实践证明,该系统克服了人工监测温度的缺点,显著地提高了DMF回收系统的自动化水平.     

变压器在线监控与故障诊断系统研究

利用传感器技术、计算机技术和通信技术，本文设计了变压器在线监控与故障诊断系统。实现了对变压器运行状态的实时监测和对变压器故障的在线诊断、判别故障类型并提供决策和控制，从而大大地提高了变压器运行的稳定性，极高地提升了供电部门的服务质量。     

高速公路交通监控系统技术应用的探讨

高速公路交通监控系统是根据各种道路交通的具体情况和实际问题,利用电子传感、计算机、自动控制、通信等技术实时地、动态地测量、控制道路及车辆的运行情况,对高速公路交通运行情况进行实时地监测和控制。     

基于3G MODEM的水质远程监控系统的设计与研究

饮用水安全现已成为制约社会发展的重要因素，加强水源地水质监控力度势在必行，然而目前偏远水源地的水质监控技术仍存在部署成本高、及时响应困难等问题。该文在分析现有水质自动监测系统通信传输技术的基础上，介绍了基于3G MODEM的水质远程监控系统的实现方案及短信通信控制方案，并结合同类实时监控系统的类似应用，提出本系统在偏远水源地水质远程监控的应用可能。     

高速泵控制系统的改造与应用

介绍了立式高速泵的结构,论述了高速泵在原有人工监控系统的基础上,利用传感器技术,PLC控制技术,触摸屏技术和远程监控技术,开发了交互式监控系统,实现了设备的状态实时监控,数据采集记录,状态异常预警,紧急故障停车,主备设备自动切换等功能.     

基于GSM短消息的无线智能溶解氧监控系统

在环境水质监测中,水中溶解氧是一个衡量水质的重要参数,如何实时准确地进行溶解氧的数据采集和处理就具有重要的实际意义.由于监测范围广,采样点分散,难于实现有线网络的远程监控.而利用GSM短消息业务[1](ShortMessage Serv-ice,SMS)进行数据传输,可以随时随地获取信息,且通信     

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-