Low-temperature photoluminescence in germanium irradiated by fast neutrons

This study was carried out to investigate low-temperature (T=4.2 K) photoluminescence caused by interdopant recombination transitions in n-germanium irradiated by fast (epicadmium) reactor neutrons and subjected to “complete” annealing (+450°C, 24 h). It is shown that lines of interdopant radiative recombination observed in initial and in irradiated and annealed specimens are caused by both initial impurities and (mainly) dopants (As and Ga) implanted by transmutation as well as by defect sets stable at long-time high-temperature annealing that do not contain fine dopants. Belarusian State University, 4, F. Skorina Ave., Minsk, 220050, Belarus. Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 64, No. 4, pp. 479–482, July–August, 1997.     

高压SF6断路器喷口烧蚀特性的模拟研究

对SF6断路器喷口的电弧烧蚀特性进行了模拟研究。根据理论模型和模拟计算结果发现，添加质量分数为1%-5%的填料，可以控制喷口对电弧能量的吸收，从而有效地改善喷口耐电弧烧蚀性能，当填料粒度大于10цm时，可延长喷口起始烧蚀时间。为提高喷口的耐电弧性能、延长SF6断路器的电寿命提供了理论依据。     

拉伸流扩散火焰面结构及熄火的研究

对拉伸层流扩散火焰面进行了数值模拟,考察了在以往湍流燃烧的火焰面模型中,假定Lewis数等于1的可靠性,研究了不同分子扩散和火焰辐射对火焰面结构、氮氧化物排放和熄火临界的影响.计算结果表明,Lewis数等于1的假定在火焰面结构的计算中存在很大的近似性,火焰辐射可以引起低拉伸条件下的熄火临界.     

View factor for inclined plane with Gaussian source

The view factor (angle factor) for a differential inclined plane in the case of a radiating source of radially Gaussian intensity is considered. This information is useful for modelling of solar radiation in certain applications. The view factor is expressed in terms of two integrals, one of which is obtained in closed form in terms of special functions, and the other is approximated. A compact estimate for the view factor is presented which is suitable for machine computation. While the relative error associated with the final estimate is typically less than 0.01%, and in all cases, less than 0.2%, the method is easily extended to yield even greater accuracy.     

Investigation of mechanism of free electron laser through spontaneous radiation spectrum

In this paper, the mechanism of free electron laser with a guide magnetic field is investigated by analyzing spontaneous radiation spectrum of electrons. The physical relation between spontaneous radiation and stimulated radiation in FEL with a guide magnetic field is studied. It is found that this relation in FEL is similar to that in quantum lasers. The spontaneous radiation spectrum is discrete. The frequency of stimulated radiation in FEL is oneselected and amplified in the radiation spectrum.     

Application of finite difference method adopted in fluid mechanics to sound propagation in ducts

Researches on sound propagation problems in ducts done by the author and other investigators in recent years are briefly discussed in this paper. The finite difference method used in fluid mechanics is used for solving these problems thus presenting an aspect of the development of research work in this field at home and abroad.The project supported by National Natural Science Foundation of China.     

HIPS的γ辐照效应的正电子寿命谱研究

测量了高强度聚苯乙烯（ＨＩＰＳ）的正电子寿命谱随γ辐照剂量的变化，观察到自由体积孔洞的平均半径随辐照剂量的增加而基本不变，且自由体积孔洞的浓度和半径分布宽度随辐照剂量的增加而减小．这一实验结果表明，γ辐照后高强度聚苯乙烯力学性能的改善与自由体积特性的变化相关联．     

NG－8型便携式密封中子发生器

介绍了ＮＧ－８型便携式密封中子发生器的结构原理及其应用。该中子发生器是一种很有应用前途的中子源。     

光纤比色测温传感器的原理及设计

文章阐述了辐射测温中比色测量的基本原理,在此基础上提出了一种适用于燃气轮机工作温度测量的新型光纤温度传感器的结构设计和工作原理;论述了运用比色测量法可全面克服系统中的光路振动、解决光纤温度传感器中的不稳定问题,提高了系统的温度精度和稳定性;给出了用比色法光纤温度测量的实验结果,证明了理论研究的正确性。     

硅酸铋(BSO)晶体闪烁性能研究

报道对BSO晶体闪烁性能研究的若干结果. 包括晶体的激发光谱和荧光光谱、光产额、发光衰减时间和抗辐照能力等特性.