水质在线检测系统

介绍了一种水质在线检测系统，该系统用于水产养殖中，能随时了解水质情况，提高养殖效益。本系统利用MCS－51单片机的多机通信原理，其上位控制机和下位采集机均采用89C51单片机为CPU。同时介绍了上位控制机和下位采集机的设计以及上、下位机之间多机通信的实现。     

浅谈新型DCS系统——JWXX-DCS柔性控制系统

DCS系统是指分散控制、集中管理的工业自动化控制系统，一般由上位机和下位机两级计算机构成，近年来广泛应用于工业的各个过程，实现生产过程的实时控制和管理。本系统是在传统的DCS基础上引进新技术、新结构形成的一种不依赖上位机的管理一体化控制系统。     

多点温度测试系统

利用MSP430单片机作为温度测控器的下位机,PC机作为上位机,采用标准RS-232C协议完成主控器与测温器之间的通信;使用PT100作为温度检测元件,为使系统具有较好的稳定性和抗干扰性,采用电压一频率转换方式进行信号变换;系统具有上、下位机两级显示功能,下位机采用的是高亮度LED显示．本系统能实时显示各点的温度,有异常情况时,可设置上下限或多点检测及声、光报警等,还可实现参数修正等功能,其检测单元数量可在1～99范围内进行任意扩充．     

选煤厂自动冲洗控制系统

将PLC与WinCC组态相结合,建立了自动冲洗控制系统。上位机的WinCC组态监控软件实现了冲水过程的图像实时监控,下位机可编程控制器(PLC)实现对自动冲洗系统各个执行机构的控制。应用结果表明,本控制系统使用方便,运行可靠。     

一种基于AT89C52的管道机器人控制系统

本文阐述了一种管道机器人控制系统,该系统由上位机、下位机子系统组成。上位机子系统为计算机主控单元,下位机子系统以AT89C52为核心,上、下位机子系统通过串口进行通信。直流电机的驱动电路采用桥式回路,直流电机远距离的通讯采用RS485通讯规范。     

—种基于AT89C52的管道机器人控制系统

本文阐述了一种管道机器人控制系统,该系统由上位机、下位机子系统组成。上位机子系统为计算机主控单元,下位机子系统以AT89052为核心,上、下位机子系统通过串口进行通信。直流电机的驱动电路采用桥式回路,直流电机远距离的通讯采用RS485通讯规范。     

水下机器人作业系统工具库的控制软件设计

SIWR-Ⅱ型水下机械手的工具库，是水下作业系统中用来装载作业工具的装置．设计了一个控制软件，以实现此工具库的控制．本控制系统将采取由PC机和MCS-51单片机组成的上、下位机结构的二级计算机控制系统．主要介绍了工具库的基于上下位机的控制系统的软件设计，并最终以该软件实现对工具库的控制．     

智能医疗输液控制系统的设计与实现

设计一款以PC机为上住机、STC89C52单片机为下位机、RS232串行通信的智能医疗输液控制系统．上位机采用VB编程语言,创建一个可视化的人机界面,通过该界面可以显示预设滴速及容量、实时滴速、剩余液量等信息;下位机是输液监控系统,实现的功能有声光报警、阵列键盘、滴速检测、步进电机控制、LCD12864液晶显示、RS232总线转换接口等．     

立式金属罐容积检定机器人控制系统设计

介绍了一种用于立式金属罐容积检定的爬壁机器人控制系统设计方案.爬壁机器人采用了非接触永磁吸附结合四轮驱动的方式实现壁面运动.其控制系统由上下位机组成,上位机控制系统主要完成爬壁机器人控制系统的管理、运动轨迹的规划、工作状态的实时显示、系统的安全诊断保护、运行、停止等;下位机控制系统则实现对运动的控制,由AT89C51微控制器为核心构成直流电机驱动电路、倾角检测电路、电源电路等模块组成.现场实验表明:该机器人不但运动灵活,而且解决了爬壁机器人运动偏斜的缺点.     

单片机在电动车永磁直流电机控制系统设计中的应用

介绍了电动车永磁直流有刷电动机控制系统软硬件的设计．该系统采用HT48R50A-1和PIC16F7162个单片机分别进行上、下位机的控制．上位机主要用于人机对话；下位机用于电机运动控制并且具有过流检测、过欠电压检测和堵转保护等功能．两机通过I／O串行方式通信．直流电机转速采用基于IGBT管的脉宽调制PWM技术进行调节，控制算法采用软件模拟防积分饱和的PI调节器进行闭环控制．最后对系统抗干扰设计进行了介绍．     

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-