负载扰动观测器在SF型矢量控制系统中的应用

文章提出广义逆矩阵来设计离散型状态观测器的方法,用该法设计的观测器,可对SF型矢量控制系统的负载力矩进行估计,再进行前馈补偿。实验证明,该法可有效改善系统的动态性能。     

合并带流动注射分光光度法研究硫羟乳酸掩蔽性能

本文运用合并带流动注射分析技术，建立了以Ｙｂ＾３＋ＸＯ显色体系为参考体系研究硫羟乳酸掩蔽性能的方法，在ｐＨ５．６硫羟乳酸能掩蔽Ｓｎ＾４＋，Ｂｉ＾３＋，Ｔｌ＾３＋，Ｈｇ＾２＋，Ｃｕ＾２＋，Ｃｒ＾３＋和Ｃｄ＾２＋测定Ｙｂ＾３＋的线性范围为１．３６×１０＾－６～２．７２×１０＾－５ｍｏｌ／Ｌ，采样频率可达１２０次／ｈ。     

Future of biological aerosol detection

Biological aerosol detection in real time is an urgent civilian and military requirement. Such detection capability will be useful in environmental monitoring, for example, in gathering information in perceived hazardous areas such as housing developments downwind of sewage treatment plants. To be truly functional, the instrument has to operate continuously, 24 h a day and 7 days a week with minimal maintenance and few false alarms. A novel concept is proposed. The system employs a rapid front-end warning/alarming mechanism based on optical technologies that provides useful information for protection decision makers. This is connected to a sample collector that feeds a slower back-end liquid chemistry system that provides analytical results to the medical personnel to assist in prophylaxis and therapy decisions. Experience gained from measuring fluorescence signals of single bacterial spores under flow cytometry (FCM) using UV excitation at 340-360 nm, was applied to concept testing of a prototype instrument, built to do the same for aerosols. This machine was capable of resolving particle size as well as fluorescence intensity of each particle under laboratory and field conditions; it was called the fluorescent aerodynamic particle sizer (FLAPS). This paper describes practical aspects of measuring biological aerosols when the results must be compared to reference samplers that provide culturable or “live” data. Treatment of particle size and fluorescence information is discussed with respect to FLAPS and reference data fidelity. Along with an objective method to evaluate FLAPS data correlation to reference data, an approach for determining limit of detection in the field is discussed. In addressing the back-end detector chemistry, we have prioritized a number of important biological characteristics that must be given to a clinician to help in prophylaxis and therapy decisions. A series of biochemical measurements are proposed to define the threat of a sample and different solutions are given to implement these tests. We predict that the future for biological detection looks promising for fluorescence in situ hybridization (FISH) techniques in identifying microorganisms. A conceptual instrument based on merging FCM and microchip-based analysis is described.     

Complexometric determination of thallium(III) in pure solution,alloys, and complexes using semicarbazide hydrochloride as a releasing agent

A simple and accurate complexometric method is proposed for the determination of Tl(III) using semicarbazide hydrochloride as a releasing agent. In the presence of diverse metal ions, thallium is complexed first with a known excess of EDTA, and the surplus EDTA is then titrated with standard zinc sulfate at pH 5.0–6.0 (hexamine) using xylenol orange indicator. An excess of 5% aqueous neutral solution of semicarbazide hydrochloride is then added and the released EDTA is titrated against standard zinc sulfate solution. The method works well in the range 2–50 mg of Tl(III) with relative errors < 0.5%, standard deviations 0.05mg and coefficient of variation 0.4%. The method is applied for the determination of thallium content in complexes and alloy compositions     

跳帧转换编码中的运动矢量修正

在跳帧转换编码中,利用前向向量法进行运动矢量合成可以得到较好的图像信噪比。本文提出了用HAVS快速搜索算法对合成的运动矢量进行修正的方法,同时给出了一个最佳搜索窗口。实验结果表明,在±2像素内,用HAVS算法对合成的运动矢量修正,既能明显提高图像的信噪比,同时又能最大限度的降低计算量。     

前向多翼离心风机叶片尾迹和蜗壳二次流动的试验研究

对前向多翼式离心风机建立了性能及流场测试台位 性能试验及流场测试表明,性能试验重复性良好,曲线符合理论性能曲线.用粒子图像速度场仪技术对叶片尾迹区及蜗壳出口横截面上的二次流做了详细的变工况测量与分析.结果表明:叶片尾迹区脉动强度达20%～70%;在设计工况附近叶片尾迹影响区域小,在非设计工况下叶片尾迹影响区域大,尾迹区域占到蜗壳径向宽度的15%～25%,约是叶片弦高的2～3倍;在蜗壳横截面上明显存在二次流旋涡;沿着蜗壳旋出方向二次流对称分布,但是到达出口时,小流量下两侧旋涡结合成一个旋涡,大流量下两侧旋涡一直保持到蜗壳出口.     

抗日战争是对中国各党派的一次大检阅--兼谈抗日战争胜利的伟大意义

抗日战争时期,中国共产党站在民族解放斗争的前沿,指引着全民族抗战胜利,为新民主主义革命的胜利奠定了坚实的基础.纵观整个抗日战争时期,国民党消极抗日,致使国家政治、经济更加腐败落后.中间党派代表民族资产阶级、上层小资产阶级的利益,成为抗战中的一支重要力量.伟大的抗日战争,对于中国各党派是一次大检阅.它检阅了哪些党派代表人民,代表进步,哪个党派将最终赢得人民,赢得胜利.     

抓住机遇切实推进我国小城镇建设

党的十六大报告指出：“统筹城乡经济社会发展，建设现代农业，发展农村经济，增加农民收入，是全面建设小康社会的重大任务。”解决中国“三农”问题的根本出路之一，就是要加快我国的城市化的步伐。小城镇建设是推进城市化进程的重要举措，是推动农村城市化进程的必由之路。本文就如何推进小城镇建设，从科学规划、投入机制、产业兴镇、搞好县域经济等方面进行了深入的思考。     

空气燃料比寻优技术在加热炉中的应用

分析了燃气加热炉热工特点，建立了热值前馈和烟气中氧含量反馈的空气燃料比寻优模型，并将模糊控制技术运用于所建立的空气燃料比寻优模型中．现场实际运行结果表明，使用该模型能合理地控制炉气的含氧量，提高钢坯加热质量，降低燃料消耗，取得了很好的效果．     

球管孔隙模型的约束寻优及应用

球管模型考虑了球孔隙和管形孔隙在不同组合形式下具有的核磁共振特征，对其进一步改进，提出带有约束寻优条件的球管孔隙模型，并用正演方法实现了对岩石孔隙结构的寻优分析．研究表明，球管孔隙模型在表面积约束、体积约束及比表面约束下的孔隙结构变化几乎是等效的．应用带有约束寻优条件的球管模型分析真实岩芯的核磁共振实验数据，得到了真实岩芯孔隙结构的最近似描述矩阵，并指出了岩石理想的孔隙结构形态．