Investigation of RuO2/Ta2O5 thin film evolution by thermogravimetry combined with mass spectrometry

The thermal evolution process of RuO2–Ta2O5/Ti coatings with varying noble metal content has been investigated under in situ conditions by thermogravimetry combined with mass spectrometry. The gel-like films prepared from alcoholic solutions of the precursor salts (RuCl3·3H2O, TaCl5) onto titanium metal support were heated in an atmosphere containing 20% O2 and 80% Ar up to 600 °C. The evolution of the mixed oxide coatings was followed by the mass spectrometric ion intensity curves. The cracking of retained solvent and the combustion of organic surface species formed were also followed by the mass spectrometric curves. The formation of carbonyl- and carboxylate-type surface species connected to the noble metal was identified by Fourier transform infrared emission spectroscopy. These secondary processes–catalyzed by the noble metal–may play an important role in the development of surface morphology and electrochemical properties. The evolution of the two oxide phases does not take place independently, and the effect of the noble metal as a combustion catalyst was proved.

High-rate, room temperature plasma-enhanced deposition of aluminum-doped zinc oxide nanofilms for solar cell applications

A custom-designed inductively coupled plasma (ICP)-assisted radio-frequency magnetron sputtering deposition system has been employed to synthesize aluminium-doped zinc oxide (ZnO:Al) nanofilms on glass substrates at room temperature. The effects of film thickness and ZnO target (partially covered by Al chips) power on the structural, electrical and optical properties of the ZnO:Al nanofilms are studied. A high growth rate (∼41 nm/min), low electrical sheet resistance (as low as 30 Ω/□) and high optical transparency (>80%) over the visible spectrum has been achieved at a film thickness of ∼615 nm and ZnO target power of 150 W. The synthesis of ZnO:Al nanofilms at room temperature and with high growth rates is attributed to the unique features of the ICP-assisted radio-frequency magnetron sputtering deposition approach. The results are relevant to the development of photovoltaic thin-film solar cells and flat panel displays.

一种基于RS—485网络的集散型控制系统

从系统构成和通信软件两方面介绍了一种基于RS-485网络的集散型控制系统。该系统的RS-485网络由1台工控机和10台可编程控制器构成。工控机通过RS-485网络控制10台独立的3自由度数控液压小车。本文提出了一种RS-485网络通信协议。

Influences of CO2 laser irradiation on the structure and photoluminescence of zinc oxide thin films

CO2 laser irradiation experiments on ZnO thin films are reported. The structural, optical, luminescent and vibrational properties of the samples were investigated by X-ray diffraction (XRD), transmittance, photoluminescence (PL) and Raman measurements. XRD results show that the crystalline of the irradiated films was improved. The (002) peaks of irradiated ZnO films shift to. higher 20 angles due to the stress relaxation in the case of laser beam irradiation. From optical transmittance spectra, all films exhibit high transmittance in the visible range, the optical band edge of irradiated films showed a redshift compared with that of as-grown films. Compared with the as-grown films, the photoluminescence emission (in particular the relative intensities of visible emissions) intensities of irradiated samples enhanced. In the Raman scattering spectral both the A I. and E modes exhibited slight Raman blueshift. (c) 2005 Elsevier B.V. All rights reserved.

Morphometric measurements as an index for estimating yield of meat in shell fishes, 2. Mussel (Perna viridis) and clam (villorita cyprinoides)

Observations (76 nos) on height-length and whole weight-meat weight relations of mussels (Perna viridis), both wild and cultured were made. From the length of mussel the height can be worked out by the equations (logarithmic scale), 1. y = 0.360+0.988 x for wild; 2. y = 0.334+1.011 x for cultured, where x is the length (cm) and y is the height (cms). So also to any height the corresponding meat weight can be obtained by the regression equation. log w=-0.8178+1.9769 log H for wild variety (1) log w=-1.3049+2.8385 log H for culture-variety (2) where w is the meat weight (g) and H is the height (cm) of the mussel. Fourteen observations on size weight measurements of dams were made. The yield varied from 8.9 to 13%. The length-height relationship worked out for clams (Villorita sp) is y=0.485+1.005 x for length x and height y.

CSRm高频系统控制器

HIRFL-CSR（Heavy Ion Research Facility at LanZhou-Cooling Storage Ring兰州重离子冷却储存环）是国家重大科学工程，其控制系统是一个庞大的系统，由许多分控制系统组成，高频系统是其重要组成部分之一。加速器的加速过程都是由高频系统来完成的。由于高频控制系统的控制对象就是高频腔体，控制系统的稳定性和输出频率的精确性将直接影响到加速器系统的正常工作，而对于高频系统的状态回读又直接决定了对于高频系统的远程监控能力，所以高频控制系统的设计非常重要。本设计基于现场可编程逻辑门阵列FPGA和数字信号专用处理器DSP搭建， 一方面可以完成从控制中心远程控制高频腔体，另一方面也可以完成对于当前状态的读取，所经过的通道也是多样化的，包括CPCI总线通信，CANBUS总线通信或者是485总线通信。本文的内容包括了1>对于高频控制系统控制对象的分析以及各种控制参数要求。2>组成此系统的硬件部分分析选择以及硬件系统的搭建过程。3>对FPGA和DSP进行程序设计的过程和方法。本文的价值不仅在于对高频系统的控制上，对于其他数据采集系统，远程控制系统以及总线通信和数据分析算法上也有着参考价值

嵌入式技术在CSR控制系统中的应用

加速器控制系统的前端控制服务器系统的实现方案已经有很多，但随着电子技术的发展，特别是嵌入式技术的发展，又有很多新的性能更高，成本更低，实现更简单的力一案产生。值CSR控制系统的新建和HIRFL控制系统的改造之机，本文在总结前人技术的基础上，提出了一科，采用嵌入式技术实现前端控制服务器系统的新型方案。本文首先简要地介绍了CSR控制系统的基本思想和前端控制服务器系统，引出前端控制服务器系统的嵌入式技术实现方案。然后对CSR控制系统的被控对象，目前现场总线的发展和嵌入式技术的最新进展进行了一些分析，找到CSR控制系统中前端控制服务器系统的嵌入式技术方案的最佳实现方法，即采用嵌入式网关将RS-485总线接入以太网的方案。接下来就着重论述了基于RS-485总线的一些关键的嵌入式模块的研制，比如数字1／0模块，ADC模块，高精度ADC模块，嵌入式网关模块等等。通过这些模块的研制和测试成功，我们可以根据需要，选择适当的模块，搭建各个前端控制服务器系统的子系统。实践证明，这种采用嵌入式网关将RS-485总线接入以太网的技术去构建前端控制服务器系统的实现方法是可行的，该方案在性能、降低成本、集成度、稳定性、网络化等方面都有显著的提高。可以预见，随着嵌入式技术的发展，我们的控制方案会越来越完善。