计算机串口技术在通信领域中的应用研究

随着设计、制造技术的不断发展,微机串口技术在冶金、自动化、监控领域和工业检测系统中有广泛的应用需求。微机串口与单片机通讯测试系统的实现使得微机与许多智能设备相连,所以微机串口通信有很好的市场前景。本文从实际应用的角度介绍了串口通信的基本原理和基本方法,并在两台PC机上利用EIARS-232-C串口线,通过C语言编程实现了实异步方式的全双工数据发送和接收。     

计重收费系统中动态链接库的设计与实现

为实现高速公路计重收费系统的统一管理,本文针对称重仪表设计并实现了串口通信动态链接库.该动态链接库作为称重仪表与收费软件的接口,采用API函数创建读串口线程,实现了对称重仪表数据的采集和处理;同时,利用Windows消息机制向计重收费系统发送消息,提高了收费软件对称重数据读取的主动性.实际应用表明,采用线程技术和Windows消息机制,结合API函数实现动态链接库对串口的读写,使计重收费软件对串口数据的操作更加高效、可靠.     

利用VC＋＋6．0动态链接库实现三坐标测量机的CNC化

为了实现三坐标测量机的自动化测量,根据现代专业测量软件Rational DMIS提供的接口函数,编写动态链接库,利用VC多线程技术和串口,实现了马达驱动式三坐标测量机到CNC型三坐标测量机的转变.对设计中使用的串口通信、多线程技术以及动态链接库的实现做了详细的介绍,实验结果表明能很好地与Rational软件连接,达到了CNC测量要求,在现阶段三坐标测量行业中有广阔的应用前景.     

基于Windows CE的HPC/PDA农业专家系统开发平台的研究与开发

阐述了基于Windows CE的HPC ／PDA农业专家系统开发平台的结构和功能以及开发平台所采用的技术,同时介绍了基于HPC／PDA的数据库管理系统的结构和实现方案。     

纺织品光学性能检测系统多线程串口通信方法

结合纺织品光学性能检测系统的开发实践,提出了一种基于VC 多线程串口通信的实时数据采集系统的设计和实现方法.在主线程的基础上,创建了两个工作者线程,一个用于监视串口缓冲区数据,一个用于对从串口读取的数据进行处理,工作者线程通过自定义消息和主线程进行通信.对系统进行了不同类型光源和纺织品检测,实验结果表明,基于多线程串口通信技术的织品光学性能检测系统数据采集准确、可靠.     

中央监护系统中的数据通讯

本文介绍了中央监护系统中床边机和中央机数据通讯模块的设计方法，该设计作为中央监护系统软件的一部分，涉及了DOS系统和Windows系统下对串口的不同的操作方法。床边机通过直接响应串口中断来接收控制命令，中央机利用了Win32系统下的多线程技术并通过调用灵活Windows API通讯函数来实现数据的安全通讯。     

利用Visval C++下MSComm开发的串口通信软件

利用Visual C＋＋6．0 MSComm控件实现串口通信软件的设计，将MSComm控件作为微软公司提供的简化Windows下串口通信编程的ActiveX控件，它通过串行端口传输和接收数据，为应用程序提供串行通信功能，利用此控件使应用程序结构简单、继承性好。通过在汽车里程检测软件中的成功应用，证明了该控件编写的串口通信软件是可靠和稳定的。     

运用串口数据与EXCEL提高长度计量效率

运用串口数据通信技术,结合EXCEL表格技术,对长度剂量提高效率很有帮助,其优势在于技术要求较低,丢失数据的概率较小,提高工作效率的效果较好,因此在计量机构应用的较为广泛。使用串口数据通信和EXCEL表格技术,在长度剂量效率的提高上要运用到串口通信协议、连接线、数据采样程序的编写等,还需要将得到的数据转化到EXCEL中。     

FD-110A型涡轮分子泵控制器串口通信的实现与应用

本文基于串口通讯的原理,并以DF-110A型涡轮分子泵控制器为模型,介绍了使用CSerialPort类实现串口通讯的步骤,分析和讨论了计算机与单片机进行通讯的协议,且在VC 6.0的基础上运用多线程串口编程工具CSerialPort类实现PC机与单片机之间的串口通讯编程.通过协议改变时,模型做很小的修改就能够很方便的移植到不同的应用系统中,具有很好的扩展性.同时,模型中利用多线程技术设计了一个串口监视的线程,能实时的监视串口状态和数据,因此具有很好的实时性.     

基于LabWindows/CVI和MCU的温度采集系统设计

设计了一种基于Lab Windows/CVI和MCU的温度采集系统。下位机由AT89S51单片机、DS18B20温度传感器、MAX232串口通信模块等组成,上位机采用Lab Windows/CVI编程,实现单片机与上位机通信。能够实现对工作现场实时温度采集,数据传输、实时处理、远程温度显示及存储,具有结构简单、显示直观、性价比高等特点。     

检定和校准证书的异同与应用

本文介绍了检定和校准以及证书的两点相同、五点不同之处,说明了对检定证书和校准证书的正确应用。     

Synthesis and luminescent properties of alkali-metal and ammonium fluorosulfatozirconates and fluorosulfatohafnates

We have synthesized a variety of alkali-metal and ammonium fluorosulfatometallates (titanates, zirconates, and hafnates). The alkali fluorosulfatozirconates and fluorosulfatohafnates have been shown to exhibit efficient roentgenoluminescence (RL) in the UV through visible spectral region, with a maximum at 390–440 nm. Their RL spectra depend significantly on their composition (cation, anion, and water content), coordination of KF and K₂SO₄, and relative amounts of fluorine and SO₄ groups. We have examined the effect of heat treatment on the RL of these compounds. The rubidium and cesium fluorosulfatozirconates Rb₃Zr₂F₉SO₄ · 2H₂O, Cs₂ZrF₂(SO₄)₂ · 2H₂O, Cs₈Zr₄F₂(SO₄)₁₁ · 16H₂O, and Cs₂ZrF₄SO₄ offer the most efficient RL.     

The shape and stability of wall-bound and wall-edge-bound drops and bubbles

The behavior of wall-bound drops and bubbles is fundamental to many natural and industrial processes. Key characteristics of such capillary systems include interface shape and stability for a variety of gravity levels and orientations. Significant solutions are in hand for axisymmetric pendent drops for a variety of uniform boundary conditions along the contact line with gravity acting normal to a planar wall. The special case of a wall-bound drop or bubble that is also pinned at an edge (i.e. a ‘wall-edge-bound’ drop) is considered here where numerical solutions are obtained for interface shape and stability as functions of drop volume, contact angle, fluid properties, and uniform gravity vector. For a semi-infinite zero-thickness planar wall (plate), a critical contact angle is identified below which wall-edge-bound drops are always stable. The critical contact angle is computed as a function of the gravity vector. The numerical procedure, which makes no account for contact angle hysteresis, predicts that such wall-edge-bound drops are unconditionally unstable for any gravity field with a component that is tangent to the wall while inwardly normal to the edge. Select experiments are conducted that support the conclusions drawn from the numerical results.     

凝固科学技术与材料

从凝固科学与实践发展的角度介绍了当前凝固材料体系的基本框架和凝固科学主要发展阶段的基本理论。作为材料科学与工程的基本组成，凝固科学技术正在现代科学理论的基础上针对传统材料的改性提高和新材料的发展需求，以控形、控构、控性为目标开展优质铸件的定向、晶体生长、快凝、深过冷及各种新型和超常领域凝固过程的研究，并介绍了其中某些方面和展望了可能的发展趋势。     

Heat and Mass Transfer and Modeling and Prediction of Environmental Catastrophes

Basic definitions and concepts of the physicomathematical theory of natural catastrophes are given. Possibilities of mathematical modeling of natural and technogenic catastrophes are discussed in the context of the theory of heat and mass transfer and the mechanics of reacting media. The importance of taking into account conjugate heat and mass exchange in modeling catastrophes is emphasized. A formula for evaluating the probability of a collisional catastrophe is given.     

Multi-ferroic and magnetoelectric materials and interfaces

The existence of multiple ferroic orders in the same material and the coupling between them have been known for decades. However, these phenomena have mostly remained the theoretical domain owing to the fact that in single-phase materials such couplings are rare and weak. This situation has changed dramatically recently for at least two reasons: first, advances in materials fabrication have made it possible to manufacture these materials in structures of lower dimensionality, such as thin films or wires, or in compound structures such as laminates and epitaxial-layered heterostructures. In these designed materials, new degrees of freedom are accessible in which the coupling between ferroic orders can be greatly enhanced. Second, the miniaturization trend in conventional electronics is approaching the limits beyond which the reduction of the electronic element is becoming more and more difficult. One way to continue the current trends in computer power and storage increase, without further size reduction, is to use multi-functional materials that would enable new device capabilities. Here, we review the field of multi-ferroic (MF) and magnetoelectric (ME) materials, putting the emphasis on electronic effects at ME interfaces and MF tunnel junctions.