HL—1M装置的真空抽气系统

本文叙述了ＨＬ－１Ｍ装置真空轴气系统的设计、调试、同时结合装置运行说明抽气效果。     

激光二极管抽运Nd∶YVO4和KTP倍频产生单频绿光激发器

报道了一种激光二极管抽运、KTP倍频的Nd∶YVO4激光器,采用折叠腔,实现了稳定的高输出单频倍频运转,绿光输出功率达到102mW,转换效率为10.7 关键词： 激光二极管抽运 单频绿光 薄膜偏振片     

旁轴近似描述的耦合系统模式耦合效率研究

从泵浦光与腔模的空间匹配函数出发，讨论了泵浦光的发散角、焦点位置等因素对激光系统效率的影响。发现在旁轴近似下，匹配函数的最大值随泉浦光发散角的增大而增大，在考虑到像散的影响后，得到泵浦光发散角的参考值。     

（BaSr）TiO3晶体光诱导自泵浦位相共轭的实验研究

对（ＢａＳｒ）ＴｉＯ３晶体中光诱导自泵浦位相共轭现象进行了实验研究。发现诱导自泵浦的输出特性取决于诱导光束强度和信号光的入射条件，并在一定条件下呈现双稳性．作者认为，这是由于诱导光束改变晶体中信号光束Ｆａｎｎｉｎｇ散射强度分布的结果。     

Optical pumping by CO2 and N2O lasers: New cw FIR emissions in vinyl cyanide

A systematical study of optical pumping by CO₂ and N₂O lasers using a FIR metallic waveguide has been undertaken in vinyl cyanide. 97 new FIR laser lines are reported in the wavelength range 400 m–1,5 mm.Unité associée au CNRS (UA 836).     

Adsorptive separation by thermal parametric pumping part II: Experimental study of the purification of aqueous phenolic solutions at pilot scale

In this work scale-up concerns in adsorptive parametric pumping operation in recuperative mode are studied. An experimental study of the purification of wastewater containing 100 ppm of phenol using a polymeric adsorbent (Duolite ES861-Rohm and Haas, France) is reported. A completely automated pilot plant (column and ancillary equipment, product receivers, sampling, collector and analytical devices) is described. The plant is computer controlled enabling automatic data acquisition for temperature, pressure and flowrate. Parameters related with adsorption equilibrium, mass transfer and heat transfer resistances were determined in order to obtain basic information to simulate the process behavior. Continuous and semicontinuous top feed parametric pumping experiments were carried out in a bed with 0.09 m diameter and 1 m long which represents a scale-up by a factor of 60 relative to previous works. Optimal operating conditions yielding the maximum productivity of the bottom product (phenol concentration <1 ppm), were achieved experimentally with the following conditions: average cycle time =4 h, ratioφ _B /φ _T =2 (φ _B =0.27), reservoir volumeQ(π/ω)=32.5l, average flowrate=0.24l/min. Based on these conditions, after 12 cycles of operation, 105l of treated water is obtained. Those optimal operating conditions were suggested by simulation studies presented in Part I (Ferreira and Rodrigues, 1995) of this work. Good agreement was obtained between experimental and simulated results using the complete model developed in Part I (Ferreira and Rodrigues, 1995).     

Adsorptive separation by thermal parametric pumping part I: Modeling and simulation

A detailed model for the recuperative parametric pumping is presented. The model includes intraparticle mass transfer resistance, axial diffusion and non-linear equilibrium represented by Langmuir equation. The sensitivity studies shows that process performance strongly increases when cycle time increases and _B / _T ratio and particle size decreases. It also shows that bottom and top dead volumes do not influence much the process performance. Evolution of the histories of concentrations and temperatures, the bed performance from cycle to cycle and the bed dynamics at the cyclic steady state have been discussed.The model revealed itself as useful to simulate the behavior of the recuperative parametric pumping process and was applied to predict optimal experimental results for the system phenol-water/Duolite ES-861 (Part II).     

Spectroscopy of the helium 2 3S–2 3P transition above 0.01 Tesla – application to optical pumping studies

Optical pumping of helium makes use of the 2 ³S–2 ³P transition at 1083 nm. We report on a study of this transition in magnetic fields up to 1.5 T. Based on these results, an optical method to measure nuclear polarisation in arbitrary field has been developed. Preliminary results on optical pumping at 0.1 T are presented. This revised version was published online in August 2006 with corrections to the Cover Date.     

南线A污水泵站浑水模型试验研究

在城市合流污水泵站普遍存在着严重程度不同的泥沙淤积问题，对泥沙输移、沉积研究较多的是明渠、河道、河口、海洋、港口等，而对泵站前池、高位井泥沙沉积、冲淤的研究仍多为定性分析。本文通过选用人工轻质沙电木屑，即通过降低模型沙的比重来相对增大粒径，达到模型和原型冲淤相似。对南线A污水泵站进行浑水模型试验，研究分析污水中固体颗粒在泵站前池和高位井中输移、沉降和冲淤规律，发现原设计方案前池固体颗粒淤积较严重，提出前池设置导流墩、倾角为45&#176;的压水板和垂直挡水板相应的优化方案，均不同程度获得前池较好的流态，固体颗粒淤积也有较大减少。