嵌入式Web服务器在PC／104上的实现

针对日益增长的仪器网络化需求,设计了一种基于PC/104模块的远程监测控制方案.使用Win98SE操作系统,通过串口通信方式获得来自MSC-51单片机的数据,并在PC/104平台上搭建Web服务器,完成了数据的接收和存储,同时使得数据可经网页访问及下载.运行结果的稳定可靠表明:该方案不仅使监控距离延伸到因特网范围,而且实现了多点监控,为传感器网络的远程数据监测提供了一种解决方案.     

嵌入式Web服务器技术在远程实验系统中的应用

随着嵌入式技术和网络技术的不断发展,两者的融合应用越来越广泛。本文提出并设计了一个基于嵌入式Web服务器技术的远程实验系统,将Web服务器嵌入到实验仪器上,客户端通过IE浏览器访问远程服务器,控制与其相联的现场仪器,采集数据并完成一个真实的实验过程。实验证明,远程测试与现场测试的结果一致,系统达到了预期的效果。     

DCS远程监控实验教学系统的OPC技术实现方法

提出了一种利用OPC技术实现对SUPCON DCS系统进行远程实时监控的实验教学系统的设计方法,实现了DCS系统实时数据的远程Web传输和动态显示等功能;对OPC客户端程序和访问OPC服务器的ActiveX控件进行了开发,实现了在Web页面中嵌入ActiveX控件并与OPC服务器的通信。结合系统实例,给出了一组通过Web访问OPC服务器来实现对现场设备进行监控的实时数据。实验证明,该方法为DCS远程监控实验教学系统的实现提供了一种新的途径。     

草原生态远程监测系统的设计与实现

分析了无线通信GPRS(General Packet Radio Service)和微处理器DSP技术,提出了基于 GPRS 的草原生态远程监测系统设计方案,论证了一种基于DSP微处理器和GPRS网络通信技术实现远程数据传输的系统,从而实现远程数据和图像的实时监测功能.本系统的核心内容是通过TMS320LF2407A DSP控制图像、温度、湿度、风速等传感器采集数据,并将采集到的数据送到GPRS DTU(GPRS Data Transmission Unit),最终通过GPRS、Internet网络传送到控制中心,控制中心将收到数据存储,并恢复出原图像.     

基于Cortex-M3远程智能控制系统的设计与实现

随着物联网技术的迅速发展,人们对远程控制的需求越来越多,文中以Cortex-M3为核心处理器,嵌入uCOSⅡ实时操作系统,采用CGI技术完成Web服务器的构建,并移植TCP/IP协议栈,应用NRF2401无线通信模块组建无线控制终端网络,最终实现了一个简单实用的远程智能控制系统;系统的控制终端通过传感器采集现场数据信息实施智能化控制,用户可通过PC机或移动终端的Web浏览器登录服务器来实现对远程控制终端的监测控制。该远程智能控制系统具有性能稳定、实时性好、设计成本低等特点,在智能家居、工业远程监测控制等领域具有较好的应用前景。     

基于 Android 平台的信息采集与远程显示系统研究

为提高农场主对温室集群信息的准确性和实时性, 提出了基于 Android 平台的信息采集与远程显示系统, 在 Android 平台上实现对温室大棚温度信息的采集与上传至远程服务器, 用户再通过 Android 客户端程序或者浏 览器实现对温度信息的观测, 从而大大提高了获取温度信息途径的便捷性, 用户可以做到随时随地实时获取。 该 系统首先将嵌入式 Android 平台通过 JNI(Java Native Interface)调用读取外置温度传感器数据, 并通过 Internet 将 采集数据上传至 LAMP(Linux Apache MySQL PHP)服务器; 再将运行 Android 客户端或浏览器访问 Web 网页, 通 过 Internet 从服务器获取数据显示给用户。 程序运行测试证明, 该系统运行稳定, 并具有很好的用户交互效果, 同时, 对信息采集端网络情况不佳时数据上传程序进行了优化处理, 实现了断网后在网络恢复时续传的功能。     

基于嵌入式Web服务器的远程监控系统

针对传统Web技术路线不能直接用于构造嵌入式Web服务器的问题,提出一种基于ARM—Vxworks和Web技术的嵌入式远程监控系统．介绍了系统设计原理和实现方法．给出了Vxworks平台下嵌入式web服务器的实现方法,包括Goahead的移植与配置．该系统结合Goform技术实现远程实时数据采集和报警,具有跨平台性,有效解决利用有限资源实现设备的网络接入问题．具有较好的性价比．管理者可以通过Internet利用Web浏览器完成对远程设备的访问、监控和维护等操作．无需安装特定软件．     

电缆沟环境状态远程监测系统

基于GPRS网络,结合太阳能供电技术、GPRS通信技术和工业组态技术,研发了电缆沟环境状态远程监测系统。系统由数据采集层、数据传输层、数据管理层组成,电缆沟内的温度、湿度、液位、可燃气体浓度等监测数据通过GPRS网络实时传输至远程监测中心,在监测中心的组态软件的控制下,实现对电缆沟环境状态的远程监测。系统具有数据传输不受地域限制、实时性较好、监测效率高、投资成本低等优点。     

基于B/S结构的GPRS无线数据传输系统的设计

针对远程数据传输中存在网络布线困难和线路检测困难等问题,设计了一种基于GPRS无线通信技术的数据传输系统.该系统在终端采用高性能ARM9处理器为控制芯片并移植了Linux嵌入式操作系统,在数据监控中心对数据采用B/S结构管理模式,本地客户端可以方便地通过任意Web浏览器与现场设备进行数据交互.文中主要给出了系统硬件设计和软件实现流程,通过实验表明,该系统能够有效地通过友好的Web界面把远程数据传输给客户端,适合于远程监控和工业数据采集系统等应用场合.     

基于云平台的汽车远程监控系统设计

为了实时监控汽车运行状态和位置,实现汽车历史数据和轨迹的查询,摆脱地域限制,设计了一套基于云平台的汽车远程监控系统.该系统包括车载终端和云端服务平台两部分.车载终端采集车辆状态数据和GPS经纬度,通过4G网络上传云端;云端服务平台包括可视化监控中心、数据库和Web服务器.系统管理员通过云端监控中心对车辆进行实时远程监控和数据查询,普通用户通过Web浏览器对车辆进行监控,形成两级监管模式.长时间运行结果表明:该系统运行稳定可靠,能够实现异地远程监控,监控数据丰富,数据刷新频率约为0.62 Hz,具有较好的实时性,能够查询车辆的历史数据和历史轨迹.     

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