双立互锁单元单粒子效应加固方法研究

经典双立互锁单元主从型触发器存在由逆向驱动引起的单粒子翻转情况。为此,通过在主从两级之间插入缓冲器阻断反向驱动路径来解决该问题。对一款双立互锁加固芯片进行地面重粒子实验,实验结果显示,改进型双立互锁单元触发器不仅能消除单粒子功能中断,而且能减少单粒子翻转情况。     

基于分布式温度监测的大空间半导体制冷系统

针对装甲车辆驾驶舱温度调节的迫切需求,对基于半导体制冷的大空间温度调节装置进行试验研究。设计了大空间试验箱、半导体制冷系统和基于分布式传感器的温度监测系统。选择不同类型的制冷片,使其工作在不同电流工况和散热条件下,得到了制冷片两端的温差与箱体内平均温度随制冷片工作时间的变化。结果表明:温度监测系统能够实时采集显示半导体制冷片冷热端与箱体内温度的变化情况;制冷片和制冷片工作电流的选择要与制冷系统的散热强度相适应才能达到良好的制冷效果;适当增加制冷片冷端的散冷能力,有助于降低制冷片两端的温差,提高制冷效果。     

微传感器表面温度非接触测试及In2O3微传感器气敏特性的研究

基于“相同温度下同一物体所产生的辐射功率相同”这一原理,搭建了一套非接触式微小芯片表面工作温度的测试平台.利用该平台对汉威电子出品的一种平面陶瓷基微气体传感器衬底的表面工作温度进行了测试,明确了其表面温度与加热电流之间的关系及芯片表面工作温度分布图.在此基础上,确定了In2 O3纳米纤维的最佳工作温度,研究了最佳工作温...     

Optical Trappings of ThO2 and UO2 Particles Using Radiation Pressure of a Visible Laser Light

Optical trappings of ThO₂ and UO₂ particles have been first demonstrated in water using the radiation pressure of a TEM₀₀-mode He-Ne laser beam of λ=633 nm. It was observed that a ThO₂ particle was successfully trapped three-dimensionally in the focus region and transferred by moving the focus. On the other hand, for a UO₂ particle of which a refractive index and an extinction coefficient are relatively large in the visible region, only two-dimensional trapping was observed when the beam focus was located near the bottom of the particle. One of the main difficulties in the optical trapping of nuclear fuel particles is attributed to their relatively large absorption coefficients in the visible region. Computational studies on three-dimensional optical trapping performances of absorbing particles were, therefore, perfomed with a simulation code based on geometrical optics. The present calculation can well predict the experimental results on the optical trapping characteristics for ThO₂ and UO₂ particles.     

253.7 nm 辐射源总辐射通量副基准的建立

简述了建立２５３．７ｎｍ辐射源总辐射通量副基准的原理和方法，提出了建立该副基准的关键问题并详细介绍了解决办法。     

Development of a hybrid method for estimating land surface shortwave net radiation from MODIS data

Accurate estimation of shortwave net radiation (S_n) at a high spatial resolution is critical for regional and global land surface models. Current surface radiation budget products have fine temporal resolutions, but only coarse spatial resolutions that are not suitable for land applications. A hybrid algorithm was developed in this study to estimate S_n from MODIS data under both clear and cloudy sky conditions without requiring coarser resolution ancillary data. This algorithm was validated using ground measurements at seven sites of the SURFace RADiation budget observing network (SURFRAD) in the United States. Instantaneous S_n estimated by this method was also compared with GEWEX/SRB and ISCCP data, and other methods. The results indicate that our algorithm can produce S_n at 1-km resolution with improved accuracy and is easily implemented to generate operational global products. Daily integrated S_n is estimated at 1-km resolution using instantaneous S_n. These finer spatial resolution datasets capture the specific sequence of the redistribution of the available energy at the Earth's surface. Therefore, they support recent high resolution land surface models.     

浅谈抑制电磁辐射干扰的方法

介绍在电磁兼容测试中，当电磁辐射测试结果不能满足相应标准要求时，通过采取良好的接地可以抑制辐射干扰，达到预期效果。     

评价电离辐射对环境危害的方法——欧洲ERICA项目简介

欧洲“电离辐射的环境危害：评价与管理”（ERICA）项目提供了关于电离辐射的环境影响评价、危害特征及管理的一套完整方法，使环境问题的决策与辐射照射、效应和危害的评价保持一致，由此达到保护生态系统结构和功能的目标。ERICA项目的成果是ERICA总方法和ERICA工具，ERICA总方法通过ERICA工具来实现。本文介绍了ERICA总方法和ERICA工具的总体结构、基本原理和筛选方法，指出了该项目需要完善的方面。ERICA项目对我国环境的电离辐射防护工作的开展具有重要的参考价值。     

Modeling multi‐stage decomposition of cotton fabrics considering char oxidation in the presence of oxygen

A theoretical model, describing thermal degradation behavior of cotton fabrics that exposed to a constant radiant heat flux, is proposed in the paper. The model describes thermal and oxidative degradation of cotton fabric under the oxygen‐containing atmosphere and considers pseudo‐bi‐component separate‐stage kinetic process. Both exothermic and endothermic reactions are included in the decomposition process. At present, gas phase oxidation reactions are not included. Comparison with experimental results demonstrates that the predictions of the mass loss rate and temperature profile with these cotton fabrics are in agreement with the experiment. Effects of thermal radiation and ambient oxygen concentration on decomposition have also been investigated. The gas phase temperature is also predicted by the present numerical model. Results from numerical model will help contribute to a better understanding of the ignition mechanism of flame‐resistant cotton fabrics used for fire safety garments. Copyright © 2009 John Wiley & Sons, Ltd.     

半导体二极管γ瞬时辐射效应

本文研究了半导体二极管瞬时电离辐射效应,给出了在闪光X射线机上的试验结果。