Voltage current and power relation in an arc plasma in a variable axial magnetic field

The variation of voltage, current and output power in a mercury arc plasma has been investigated in an axial magnetic field (0–1350 G) for three values of discharge current namely 3, 4 and 5 A. The voltage increases and current decreases almost linearly and the output power also increases with increase of the magnetic field. The conductivity value in magnetic field has been calculated and an analytical expression presented to represent the variation of conductivity in the magnetic field. Utilizing this expression the variation of output power with magnetic field can be explained.     

MC98-A型多功能极谱仪研制

以８０９８单片机作智能部件的小型多功能极谱仪，采用ＳＴＤ标准总线结构，汉字菜单式提示，人－机对话方式操作。以阳极溶出和电位溶出分析为主，用三种定量分析方法直接显示，打印出测试曲线和分析结果。     

适用高精度电流表校测的直流稳流电源

研究一种高稳度直流电源电路,它采用闭环式负反馈稳压控制回路（比例积分器）来实现输出电流的恒定．叙述了电路的工作原理和电路基本组成．并对电路的主要无任元件、参数作了分析计算,该电源作为直流电表校测电源,其可调范围大,性能稳定     

Precise determination of manganese in steel by dc glow discharge optical emission spectrometry associated with voltage modulation technique

A voltage modulation technique was applied for the precise and accurate determination of manganese in steels in dc glow discharge optical emission spectrometry. Emission signals from the glow discharge plasma are modulated by a cyclic variation of the discharge voltage so that only the desired signals can be detected at very low noise levels by using a lock-in amplifier. Mn determination in low-alloyed steels was performed to estimate the repeatability of the analytical result. For each measurement, the relative standard deviation (R.S.D.) of the intensities of the Mn I 403.08-nm line was ca 0.1% when a steel sample containing 0.329 mass% Mn was employed. Averaging all analytical values, which are obtained in various discharge conditions, yields statistical information on the precision and accuracy of the analytical values obtained. The relative error from the recommended value is calculated to be 0.5%. The R.S.D. over the analytical values is 1.5%, representing the overall analytical performance of this technique.     

Photochemistry and kinetics of single organic nanoparticles in the presence of charge carriers

This paper describes a preliminary experimental study on charge injection in MEH-PPV polymer nanoparticles incorporated in an OLED type device. The nanoparticles have been investigated with single molecule fluorescence spectroscopy recorded simultaneously with charging and discharging of the particles. Structure and dynamics of an anion/MEH-PPV complex, proposed to be responsible for discrete photobleaching in conjugated polymers, have been investigated with this technique. Device physics and kinetics have been elucidated by using the fluorescent conjugated polymer nanoparticles as probes for detecting the presence of hole polarons, and have been related to the electrically induced oxidation and reduction of the anion/MEH-PPV complex.     

用于痕量分析的高精度色谱数据采集卡

设计了一由双电压频率转换器（ＶＦＣ）构成高精度色谱数据采集方法，具有原理简单、精度高、噪声小、价格低等特点，可广泛应用于色谱分析中分析信号的采集．     

Analysis of synthetic peptides by capillary electrophoresis: effect of organic solvent modifiers and variable electrical potentials on separation efficiencies

In this study, procedures based on volatile ammonium acetate buffer electrolytes of high pH value containing different organic solvent modifiers have been developed to achieve very high efficiency separations of histidine-containing synthetic peptides by high-performance capillary electrophoresis (HPCE) employing untreated fused silica capillaries. Different organic solvents, including acetonitrile, methanol and ethanol, at high volume fractions were used to modify the composition of the background buffer electrolyte. With the peptides investigated, it was found that methanol had the greatest effect in terms of enhancement of separation efficiency, as determined from the evaluation of theoretical plate numbers, N, of these HPCE systems. On the other hand, separation selectivities, e.g. the alpha(ij) values, did not change significantly as the volume fraction, psi, of the organic solvents was increased up to psi = 60% (v/v). Under these conditions, very rapid, e.g. 1-2 min, separation times could be still achieved. Compared to the effect of carrying out the separation of these peptides at constant voltage, a dramatic increase in the separation efficiency was also achieved by applying a linear voltage gradient during the HPCE experiment. Under optimal conditions of organic solvent composition and linear voltage gradient ramps, very high peak efficiencies for the studied set of synthetic peptides with N values of approximately 2-3 million theoretical plates per meter could be routinely obtained with fast analysis times. Moreover, these buffer electrolyte conditions are compatible with direct interfacing of the HPCE effluent to electrospray ionisation and ion trap mass spectrometers, thus expanding the analytical capabilities of these HPCE systems.     

晶闸管直流稳压电源的稳态误差

根据晶闸管直流稳压电源系统的典型结构，分析稳态误差种类，导出一般公式，提出减小稳态误差的一般方法。     

RC二端口网络电压传递函数的研究

本文从RC二端口网络的电压传递函数及入端导纳的表达式出发,研究了电压传递函数,入端导纳,负载导纳之间的关系以及它们和网络Y参数的关系,得出了几个重要关系式。这些结论对丰富RC二端口网络的综合方法提供了必要的理论基础。     

一种新型冷暖风机电路的分析、设计和计算

从最佳设计方式和高可靠性角度出发,讨论和研究了新型冷暧风机电子控制电路的分析、设计和计算.