Lifetime Measurements for Electric-Dipole △n=0 Transitions in the Beryllium-Like Sulfur

We have measured lifetimes of △n=0 allowed transitions in beryllium-like sulfur using beam foil spectroscopic techniques. The measured values, derived from analysis of arbitrarily normalized decay curves, are presented and compared with theoretical calculations and previous measurements. Accurate probabilities have been determined by the well-known relationship.     

热处理对辐照区熔硅单晶的重要作用

阐述了热处理对辐照区熔硅单晶的影响.     

热处理条件对双粉工艺中Bi—2212粉末的相组成影响

实验研究了Bi-2212粉末在空气，8％O2和纯O2种处理的相组成特征，指出通过改变热处理温度和气氛可控制前驱粉中对2223成相影响较大的(Bi，Pb)-2212相，Ca2PbO4相，2201相和14：24AEC等相。     

石灰石闪蒸改性及脱硫性能的试验研究

本文对3种不同产地的石灰石进行了闪蒸改性处理,对改性石灰石颗粒的孔径分布进行了测定,研究了压力、温度等参数对石灰石闪蒸改性的影响。并在气流反应器上对闪蒸后的样品进行了硫化试验。结果表明,在一定的压力和温度下,闪蒸处理能够增大石灰石颗粒的微孔孔径,并使石灰石样品的脱硫性能得到较大提高。     

浅谈先进陶瓷

中国陶瓷有着漫长的发展历史,中国最早的陶器可追溯到9000年前,而瓷器也早在4000年前就已出现。如今陶瓷制品广泛应用于社会生活、科学技术的方方面面。所谓陶瓷,从广义上讲,指除有机和金属材料之外的所有其他材料,即无机非金属材料;从狭义上讲,陶瓷材料主要指多晶的无机非金属     

采用热处理方法提高MEH-PPV单层聚合物有机发光二极管发光性能的研究

对以MEH－PPV为发光层的单层聚合物有机发光二极管（OLED）器件在最佳条件下进行真空热处理，并用金相显微镜观察施加电压后器件的阴极表面形貌。发现处理后的器件阴极表面的气泡及黑斑明显减少。器件的发光性能显著提高。与未经处理的器件相比，最大相对发光强度提高了一个数量级、启亮电压降低了2．0V，半寿命提高了12．7倍。初步分析表明热处理方法提高器件发光性能的主要原因在于有效地减少了器件在工作过程中由于焦耳热产生的某些气体，从而减少阴极表面气泡及黑斑的出现，另一方面，热处理方法也增强了有机发光层与阴极接触界面的结合力，提高电子注入水平。     

热处理对V-4Ti合金氦的滞留与热解吸行为的影响

钒合金由于其低中子诱导的放射性和良好的高温性能被认为是未来聚变堆很有希望的第一壁和结构材料。因为氦可以通过放电清洗和中子嬗变产生，氦的滞留与热释放行为将是钒合金在聚变堆应用的重要课题。A．V．Veen领导的研究小组用1keV的氦离子注入到10^13-10^14He／cm^2的剂量研究了钒合金的氦俘获和热解吸机理以及预退火处理的影响。两群热解吸峰被发现，他们认为一个对应于氦，空位一杂质链，另一个对应于氦，带有钒合金原有的缺陷，如细小的析出物所俘获。既然钒合金原有的缺陷与退火处理有关，热处理对氦在钒合金中的滞留的影响是可以预期的，并且已被实验所证实。     

医疗和危险废物高温洁净热处理及环境力学

结合2003年中国的突发危害公众健康的事件，分析了医疗、化学战剂及危险废物的分类、特性，比较了各种高温热处理技术的基本要求，方法分类和设备特点，包括：各类焚烧炉、热解炉和等离子体裂解装置．还对前处理工艺要求，尾气处理工艺等进行了分析讨论，讨论了防止二次污染的技术手段，特别介绍了二噁英等高危险性产物的特性．还介绍了发达国家的医疗废物和危险废物的管理、处置和二次污染防治等情况．     

A Mossbauer study of the magnetic coupling in iron phosphorous trisulfides

The polycrystalline sample of layered compound FePS_3 has been investigated by using M?ssbauer spectroscopy (12K to 300K), magnetic susceptibility measurements, x-ray diffraction and FTIR spectroscopy. The antiferromagnetic order exists below T_N=120.5±1K. The M?ssbauer spectra below T_N indicate that the magnetization axis is perpendicular to the layer of FePS_3, and the divalent iron cations are in their high spin configurations. By fitting the hyperfine field parameters near the Néel temperature, we obtain information on the nature of magnetic interactions in the material. The results show that the magnetic coupling can be treated by the two-dimensional Ising model, and it can be interpreted on the basis of a crystal-field effect.     

Effects of Post-Thermal Treatment on Quality of SiC Grown by PVT Method

We report the effects of post-thermal treatment on the quality of 2-inch 6H-SiC wafer cut from a crystal boule grown by physical vapour transportation method. The full widths at half maximum of x-ray diffraction rocking curves measured on sites across the 2-inch wafer become narrower, indicating the quality improvement after a three-step post-thermal treatment. It is found that the most common defects such as micropipes and inclusions can be significantly reduced after the treatment. Our results show that the post-thermal treatment is an effective route to improve the quality of SiC single crystals.