利用大用户自有宽带网络实现电能监测

阐述了供电公司对大用户电能在线监测的重要性。通过比较国内现有的几种无线通信方式,选择大用户自有的宽带网络作为通信平台。介绍了以TINI模块为核心技术,实现电能表与宽带网络通信的解决方案和电能监测系统的组成以及功能。整个系统最终真正实现了高效的数据传输和零运行费用。大用户还可通过WEB网查询实时电量,用以控制生产成本。     

基于TINI平台的嵌入式互联网接入技术研究

随着网络技术的发展,将各种设备接人互联网,利用互联网实现数据传输与远程监控成为当今电子设备发展的必然趋势.文中介绍了DS80OC400芯片以及基于此芯片的TINI系统.提出了采用TINI系统来实现非网络设备接入互联网的方法,包括硬件结构、软件设计以及开发流程等,并以RS-232接口为例,给出了此方法的具体实现.与传统的通过PC机转接的方法相比,此方法具有开发成本低、效率高、运行稳定、低功耗、体积小等特点.     

Melting and solidification of TiNi alloys by cold crucible levitation method and evaluation of their characteristics

Abstract

The addition of Re, Fe and Cr into Ti–50 mol.-%Ni has been carried out to improve the oxidation and mechanical properties. The mono phase consisting of TiNi with the B2 type structure was identified in micro-alloyed materials proposed on the basis of the d-electrons concept. Experimentally, TiNi alloys were melted and solidified by the cold crucible levitation melting (CCLM) method. The TiNi–(Cr, Fe, Re) alloys with high purity and without contamination from a crucible were prepared, and the homogeneous microstructure was achieved by the diffusion mixing effect of CCLM even in the as-cast alloys which contained Re and Cr with higher melting temperatures and different specific gravities. The transformation from austenite to martensite phases occurred in all alloys below or above room temperature. Some alloys had the ability of shape memory even at room temperature. Ternary alloys showed a higher flow stress level compared with the binary TiNi alloy. On the other hand, the oxidation at 1273 K was promoted by the formation of titanium oxides (TiO₂) on the alloy surfaces. The oxidation resistance was improved by the formation of the continuous Cr₂O₃ film in TiNi–Cr alloys. The alloying effects by ternary elements (Re, Fe, Cr) in the intermetallic TiNi as well as metallic materials were explained well using two parameters used in the d-electrons concept.     

基于TINI的嵌入式数字图像采集系统

以DS80C400为核心，利用微网接口(TINI)设计了嵌入式数字图像采集系统；将数码相机M4088模块直接与DSTINIM400模块相连，以UDP作为嵌入式以太网的传输层协议直接联入以太网。文中对硬软件结构和快速采集图像数据关键问题进行了分析和研究。该系统应用于压印字符图像采集中，取得了良好效果。     

Hydrogen embrittlement of an HSLA 80 steel in sea water under cathodic charging conditions

Abstract

Hydrogen embrittlement of a copper precipitation strengthened and niobium microalloyed HSLA 80 steel on cathodic charging in synthetic sea water has been studied using a slow strain rate technique. The effects of strain rate and potential applied for hydrogen charging have been studied. Hydrogen measurement at different potentials has also been carried out. A loss in ductility in terms of a drop in percentage elongation and percentage reduction in area has been observed, the effect being prominent at potentials beyond —800 mV(SCE). Fractography by SEM shows a dominance of microvoid coalescence with increasing quasicleavage features at higher negative potentials. A hardening effect of hydrogen charging up to —600 mV(SCE) followed by a softening effect has been observed. The results are discussed in the light of the existing models of hydrogen–dislocation interaction and hydrogen induced microvoid coalescence.     

60 dB动态范围的自动增益控制电路设计

设计了一种工作频率在15.42 MHz应用于GPS射频接收芯片中的自动增益控制(AGC)电路,该电路与传统AGC结构相比,不需要峰值检测电路,也不需要环路滤波器,大大简化了设计复杂度,同时也使电路性能受工艺及温度变化的影响大大减小了,因此适用于低功耗、高集成的GPS射频通信系统中.电路设计采用TSMC 0.25 μm CMOS工艺,电源电压2.5 V,经过流片验证,其动态范围可达60 dB,工作频率范围为[3.8 MHz,40 MHz],总功耗5 mW     

利用TINI和Java设计远程测控系统

介绍了利用TINI和Java设计远程测控系统。该系统使用嵌入式系统TINI作为系统现场控制核心，进行实时温、湿度控制，可以在测控现场或在远程通过PPP协议进行远程控制。重点介绍了基于TINI的系统硬件设计和使用Java语言在TINI的嵌入式开发环境中实现Ethemet(TCP／IP)，PPP，1-wire等多种通信协议和接口的方法。     

基于TINI的远程分布式数据采集及控制系统

介绍的远程监控系统利用TINI平台实现传统设备与以太网的连接。其串口与底层I／O接口相连，上层则直接连入Internet．允许授权的用户在客户端通过Internet用浏览器访问该系统并实现对工业现场设备的监控。     

Effect of tin on melting temperature and microstructure of Ag–Cu–Zn–Sn filler metals

Abstract

To develop low melting point filler metals for brazing TiNi shape memory alloy (SMA) and stainless steel (SS), a series of Ag–22Cu–Zn–Sn (wt-%) filler metals have been studied. Using differential thermal analysis (DTA) analysis, the melting temperatures of Ag–22Cu–Zn–Sn filler metals were determined. The results show that the increase of zinc and tin contents drastically decreases the solidus and liquidus temperatures of the Ag–22Cu–Zn–Sn filler metals and the melting temperatures of the Ag–22Cu–18Zn–Sn filler metals with 5–8 wt-%tin are < 650°C. Metallographic observations indicate that the increase of zinc and tin in the Ag–22Cu–Zn–Sn filler metals helps the formation of eutectic structure and inhibits the formation of α-Ag and α-Cu solid solutions, but the increase of tin also causes the formation of Ag₃Sn and Cu₄₁Sn₁₁ brittle compounds. The results of mechanical property tests of the laser brazed joints of TiNi SMA and SS show that the proper increase of zinc and tin in Ag–22Cu–Zn–Sn filler metals is favourable for improving the strength of the laser brazed joints of TiNi SMA and SS.     

嵌入式网站家庭测控系统开发

介绍了利用JAVA、TINI、控制电路板、单总线组建测控系统.重点介绍了控制电路板的设计和研制,以及JAVA远程设备控制程序的开发.该系统使用嵌入式系统TINI和主控制电路板作为系统现场控制核心,可以在远程网络平台上进行对各种家电的控制.