单片机在大气微尘测量中的应用

介绍了用于检测大气流量的涡街传感器的工作原理、大气旋涡的脉冲转换方法，探讨了以ＡＴ８９Ｃ５１单片机为核心微尘测量仪的硬件框图，及单片机实现流量检测与控制的软件流程图．     

强流微秒脉冲供电Yb,Eu,Y,Sm空心阴极灯的增强发射光谱

本文利用实验室研制的强流微秒脉冲空心阴极灯电电源，研究了稀土元素Ｙｂ，Ｅｕ，Ｙ，Ｓｍ空心阴极灯的发射光谱，得到了在强流微秒脉冲和直流供电下的发射光谱图，在强流微秒脉冲下，这些元素空心极灯的谱线可增强几十至１０＾４倍，考察了电源参数和发射谱线线强度的关系。     

路灯安置优化问题研究

首先分析了路灯照明强度特性 ,然后建立了一盏路灯、两盏路灯、一排路灯以及街道两边路灯的优化模型 .采用 Monte Carlo法求解复杂方程确定的面积 ,用黄金分割法和坐标轮换法解决了两盏路灯优化问题 .用 MATLAB优化工具箱解决一排路灯以及街道两边路灯的优化模型 .     

A high-resolution spatial heterodyning interference spectrometer

A novel spectrometer which has a resolution of 0.013 nm with high throughput is described. The system uses a Michelson interferometer in which the mirrors have been replaced with Littrow-mounted diffraction gratings. First-order diffracted beams returning from the gratings interfere at the interferometer output to produce a spatial interferogram which is heterodyned about an optical frequency determined by the setting angles of the gratings. The heterodyning process leads to increased resolution, but limits the free-spectral range of the instrument to, in our case, about 3 nm. This is sufficient for characterizing narrow-band sources such as laser diodes. We present the theory of operation of the instrument and some sample spectra obtained from a sodium vapor lamp, a HeNe discharge, and a 670 nm diode laser.     

Optimization of pulse lamps for dye lasers

We carry out investigations of the generation efficiency of a dye laser in which, as a source of pumping, tubular lamps are used that are enclosed in shells to withstand the pressure of the xenon filling them. It is found that the optimum pressure is 60–80 torr, which ensures the greatest luminous efficiency of the lamps in the short-wave region of the spectrum at standard electrical parameters of the power supply system. Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 65, No. 1, pp. 134–137, January–February, 1998.     

昆明西郊行道绿化植物五种有毒重金属元素含量特下分析

对昆明西郊行道绿化植物“五毒”重金属元素含量特征进行了分析，结果显示，在地道绿化植物中，元素含量的相对离散度为Ｃｄ〉Ａｓ〉Ｈｇ〉Ｃｒ〉Ｐｂ，与含量变化顺序不匹配，元素间仅Ｐｂ与Ｃｒ呈现十分正相关。     

Contact electrification phenomena on phosphor particle surfaces

Contact electrification phenomena are reviewed to understand phosphor powder behavior. The origin of contact electrification is described in terms of the acid–base concept for solid surfaces. Electric charges produced by contact electrification affect phosphor properties. Various examples related to contact electrification are shown: particle surface modification, dispersion in liquids, adhesion strength to a substrate, electrostatic coating, interaction between a phosphor and mercury in a fluorescent lamp, and electron emission ability in a fluorescent lamp.     

Comparison of two filament lamps by difference hologram interferometry

Total bulb fill pressure and density changes inside incandescent lamps can be studied by holographic interferometry. The main drawback stems from the fact that such techniques only provide information concerning the integral refractive index changes in response to a given electrical load. Difference hologram interferometry results in a direct comparison of any one of the large volume production lamps with a master lamp. A short discussion of the technique is presented and its experimental application is described where the difference interferogram is evaluated automatically.     

Experimental Parameters Affecting the Intensity of Cadmium Electrodeless Discharge Lamps

Abstract

Several experimental parameters have been found to affect the intensity of microwave excited electrodeless discharge emission at the cadmium resonance line (228.8 nm.). A thorough study of the effect of pressure of the fill gas, microwave power applied to the tube; and weight of Cd introduced into the tube has been accomplished. Direct comparisons of Cd resonance emission for the cases of He, Ne, Ar and air fill gases are presented. From these studies preductions of optimum conditions for construction and operation of Cd electrodeless discharge lamps may be made.