一种设计传递函数的有效算法

本文提出一种利用传递函数性质和连分式插值法由幅一频特性设计传递函数的算法,该算法具有计算量小,使用方便,设计精度只受计算机字长的限制等特点。在IBM—PC上运行结果表明,本算法是可靠而有效的。     

XML技术在变电站自动化系统中的应用

变电站自动化系统要求开发一种能够描述变电站配置的工具.XML由于具有自定义性和可扩展性、数据内容与显示处理分离等优点被广泛应用于电网自动化系统中.IEC61850中的SCL就采用XML作为变电站配置描述语言.在对SCL对象模型进行分析后,介绍了XML在变电站自动化技术中的应用.     

On-line liquid chromatography – gas chromatography for automated clean-up and analysis of polycyclic aromatic hydrocarbons

A fully automated system, comprising a liquid chromatograph (LC) coupled on-line to a gas chromatograph (GC) by means of a loop interface, has been constructed for clean-up and analysis of polycyclic aromatic hydrocarbons (PAH). An autosampler was utilized for sample injection into the LC. By the use of a back-flush technique in conjunction with an ordinary analytical aminopropylsilica column, PAH could be isolated by LC: a concurrent solvent evaporation injection technique was then used for on-line transfer of the PAH fraction to the GC, where the PAH analysis was completed. Compared with ordinary off-line LC clean-up followed by GC analysis, the sensitivity has been increased by a factor of 50–100, yielding a detection limit for individual PAH of a few nanograms per sample when using flame ionization detection. Further, irreproducible losses of low molecular weight PAH as a result of solvent evaporation steps in off-line clean-up procedures have been eliminated. Reproducibility of retention times and relative peak areas is high, facilitating automatic peak identification and calculation of concentrations, and the system can thus be used for automatic sample evaluation. The total time required for clean-up and analysis is only 1.5 hours, and the demand on personnel time for the analysis of PAH has been drastically reduced. The technique has been demonstrated with samples of urban air and of used automobile engine lubricating oil.     

Application of laboratory robots in industrial automation

Attempts to automate the determination of biological oxygen demand in industrial waste water and the measurement of the pH and acidity of yoghurt samples from a production line are described. Both applications include novel approaches in order to solve the problems encountered. A brief discussion is given of the demands on a customer when installing robotics for automation.     

HPLC micro-fractionation coupled to a cell-based assay for automated on-line primary screening of calcium antagonistic components in plant extracts

High performance liquid chromatography (HPLC) micro-fractionation was successfully coupled to an automated ⁴⁵Ca²⁺ uptake assay using GH₄C₁ cells for the separation of natural product extracts and for the primary detection of their calcium antagonistic components. The reliability of the procedure was first established with a reference solution consisting of pure compounds with a known effect on the Ca²⁺ uptake. No loss of activity was observed to occur after HPLC micro-fractionation. Extracts of Peucedanum palustre and Pinus sylvestris, showing high and no inhibition of Ca²⁺ uptake as total extracts, respectively, were analysed and the inhibitory activity of the P. palustre extract could be traced to two components, identified as columbianadin and isoimperatorin. As expected, no significant inhibition was observed with the micro-fractionated P. sylvestris samples. In summary, the procedure was found to be applicable for primary detection of calcium antagonistic components in complex matrices and to significantly reduce the time previously needed for bioactivity-guided isolation.     

Automated instrumentation for miniaturized displacement electrophoresis with on-column photometric detection

This paper describes an automated equipment for capillary displacement electrophoresis (isotachophoresis). The equipment employs the advantages of a separation channel with a nonuniform cross-section. The system works in a closed mode, the analytes are determined as anions in the examined arrangement. The pH gradient is within the range 4.4–11.0, the total voltage over the separation channel is from 150 V to 900 V at a constant current of 20 μA or 10 μA, respectively. Cetyltrimethylammoniumbromide and either hydroxypropylcellulose or hydroxypropylmethylcellulose are used in the leading electrolyte to control the electroosmotic flow.

The reproducibility and the minimum detectable concentrations are determined and calibration curves are measured using a model mixture of p1 markers and myoglobin as analytes and either low-molecular-mass ampholytec buffers or synthetic carrier ampholytes as spacers. Both Gaussian peaks and the square-wave zones were evaluated.     

Automated on-line-solid-phase extraction—high-performance liquid chromatography-diode array detection of phenolic compounds in sherry wine

A new analytical method has been developed for sample preconcentration and analysis of phenolic compounds in sherry wine using on-line solid-phase extraction(SPE)-HPLC-diode array detection. The samples of wine were injected and adsorbed onto polystyrene divinylbenzene cartridges; a robotic semiflexible system was used to automate the SPE stage. Chromatographic separation was carried out in a Symmetry C₁₈ steel cartridge, with a two-step elution gradient. Peaks were identified by comparing their UV spectra with the library of spectra compiled by the authors.     

办公自动化系统软件开发平台的分析

本文针对办公自动化系统软件的开发，描述几种流行的办公自动化系统开发工具及操作平台分析总结出操作平台应该具备的核心功能。     

Delphi高级接口技术及其在数据处理中的应用

在Delphi7.0环境下利用OLE Automation技术实现了Delphi,Fortran,Surfer和AutoCAD的无缝集成,并编制出一套地震面波频散曲线自动成图以及频散数据自动读取的应用软件,同时给出了在地震海量数据处理方面的应用实例.     

泡沫塑料切割的自动化系统简介

本文介绍一种由单片机控制的泡沫塑料切割的自动化系统。