基于C#的多串口通信策略的研究与实现

针对多路通信、数据采集等领域,上位机自带串口数量无法满足多串口通信需求的问题,在系统介绍串口通信技术的基础上,结合一机多秤称重管理系统,采用4232A多串口扩展器,以C#为开发语言,利用MSComm控件,实现了多串口通信和数据管理功能,提高了数据采集的实时性和准确性,为多串口应用系统提供了有效的解决方案.     

自动售货机接入Internet的一种新设计

接入Internet的自动售货机可实现网上付款,商品管理和网络销售等全新功能.介绍了一种新型网络接口芯片PS2000在自动售货机系统中的应用.完成了MCU与PS2000的硬件连接设计和MCU中实现网络通讯的软件部分.自动售货机通过PC机上的网关软件即可进入Internet,通过网页可对自动售货机完成远程工作状态监测、远程控制启停、远程库存查询和远程购物等操作.     

一款多媒体自动售货机远程管理系统的设计与实现

本设计在原有的自动售货机上添加平板电脑,从而实现自动售货机终端的多媒体功能,并采用能够实现远程测控的GPRs模块,最终完成自动售货机远程管理和信息传播完美结合.     

基于Modbus/TCP协议的楼宇控制器设计

针对楼宇自动化系统（BAS）,设计了以AT89S52单片机为核心的智能控制器。采用一体化结构,其内部集成了输入,输出模块,RS232／485接口以及可编程网关通信模块NE4100,可作为BAS中的一种通用区域控制器广泛用于电梯、照明、火灾报警等各个子系统中。网关模块采用基于Modbus和TCP协议的串口通信方式,通过互联网实现区域控制器与中央管理系统的通信。设计全面兼容Modbus工业标准,数据传输可靠,响应速度快,扩展灵活,实现了楼宇的智能化、网络化管理。     

基于ARM处理器的ULP与LTE网关系统设计

 针对移动通信与蓝牙网络异构壁垒,设计一种以ARM 处理器为核心的ULP/LTE 网关系统。网关主控采用ARM9 控制板,通过串口分别连接LTE 的中兴EM3760 以及ULP 的芯片CC2540,并设计该芯片外围电路,在主控芯片中移植μC/OS-II操作系统,以实现网络数据帧协议转换。测试结果表明,该网关系统实现了ULP 与LTE 两种异构网络之间的数据协议转换,且在实际应用中性能良好,可将ULP 蓝牙网络节点采集数据通过LTE 网络快速地传输至云端。     

计算机串口通信程序设计

在当前的各种实时监控系统和通信系统中,串口通信是应用最为广泛的通信方式之一,基本上各种下位机都支持串口通信,在大多数系统设计时串口通信部分的功能是类似的.以实现这些功能为主线,探讨了在具体设计时所需要注意的问题.     

基于VoWPAN的蓝牙多跳语音通信系统设计和实现

设计并实现了一种基于VoWPAN的新型蓝牙语音中继系统,包括蓝牙电话、网关、耳麦和中继器4种设备.在先期实现蓝牙网关和蓝牙耳麦通信的基础上,进一步实现了蓝牙电话、网关和耳麦任意两者之间的全双工通信,系统内设备通过网关可以接入市话网.系统采用了无中心的通信模型,中继器的使用提高了系统的通信容量和通信距离,设备能够自主选择跳转路径进行通信.阐述了中继器的硬件和软件设计方案,分析了实现的过程、系统干扰情况以及建链时延等参数.     

基于S3C44BOX的嵌入式系统串口通信的实现

采用S3C4480X芯片作为串口通信的控制核心器件,实现了串口通信。利用MAX3232C芯片实现电平转换,S3C44BOX实现两路RS－232串口通信,并且给出了系统的硬件实现原理图。文章分析了软件实现过程：初始化串口、配置串口、发送数据和接收数据。通过实验得出该串口可以达到高效稳定的通信效果。在嵌入式系统中的串口通信技术广泛应用于基于串口通信的各种场合。     

PowerBuilder应用于数据采集系统中通信接口的实现方法

PowerBuilder是开发数据库应用程序时的首选工具，但有时应用程序会涉及到通过串口通信进行数据采集的情况，而PowerBulilder由于本身功能所限，无法直接进行串口通信。为实现串行通信必须采用间接的方法，比较研究了直接端口读写、文件操作、OLE控件和API调用4种间接实现串口通信的方法，介绍了各自的特点和适用情况。     

基于单片机的GPRS无线上网

1硬件连接和模块设置GPRS模块与微控制器间是通过串行口进行通信的,模块与控制器间的通信协议是AT命令集,其中大部分命令是符合协议AT command setfor GSM Mobile Equipment。SIM卡在这里可直接插到GPRS模块所提供的槽里面。采用12864字符液晶显示器,可以显示通过GPRS传输并经过微控制器处理过的数据。系统结构如图1。在对GPRS操作之前,先对GPRS模块进行设置:①设置通信波特率;②设置接入网关;③设置验证默认的用户名和密码;④连接指定公网的指令。图1系统总体结构图GPRS模块可以通过拨号登录到GGSN上动态分配到Internet网的IP地址[2]。GPRS模块与网关的通信要符合点对点协议PPP。应用PPP协议登录之后,就可以通过GGSN接上Internet。2软件设计程序中的所有代码都是用C语言编写的,并采用分层的结构,从底到上分别为:串口驱动层、PRS模块驱动层、PPP协议层、IP协议层、UDP协议层与应用层。本文只给出串口驱动层、PPP协议层的实现过程。串口驱动层主要实现串口读写、串口数据等操作。下面为读函数ReadComm和写函数W rite-Comm的代码。V...     

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.     

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.     

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-