A note on the heat-transfer to nonspherical particles from plasma

Heat transfer from plasma to a nonspherical partical in the free-molecular regime is studied in the present paper under thin plasma sheath condition. Analytical expressions for the floating potential charge and heat fluxes of an ellipsoid particle of revolution are derived and curves are given for key parameters for arbitrary plasma flow direction. On the basis of these results, an equivalent sphere with the same surface area as the nonspherical particle is suggested to be used for calculating the total heat flux of nonspherical particle in engineering application with acceptable accuracy. Furthermore, the effects of particle rotation, which occurs in most aerosol systems, on the heat transfer are also discussed.

Tm^3＋-Yb^3＋共掺氧氟硅酸盐玻璃热学性能和上转换发光特性研究

稀土掺杂氧氟玻璃是一种优良的上转换发光材料，制备了组分为35SiO2—15AlO1.5-（45-x）PbF2-xCdF2—0．1TmF3—1．5YbF3（x=0，10，20，30）的氧氟硅酸盐玻璃，系统研究了CdF2含量对其热学性能和光学性能的影响。研究表明用CdF2部分替代PbF，可以提高玻璃的热稳定性、使紫外吸收截至边向短波方向移动；随着CdF2含量的增加，开始Tm^3＋蓝光和红光上转换发光增强缓慢，而后迅速增强．而近红外上转换发射先显著增强后增强放缓；由于蓝光和近红外发光强度远大于红光发光强度，所以

量子点光学声子模的分类和热载流子失能率问题的初步研究

Submitted by zhangdi (zhangdi@red.semi.ac.cn) on 2009-04-13T11:45:31Z

小麦品质性状的搭配效应研究

以面包小麦品种作试验材料 ,研究混合粉的搭配效应 ,结果如下 :(1)混合粉的品质性状可以分为两大类 ,一大类是表现“加性效应”的性状 ,如蛋白质含量 ,和面曲线的峰高和Zeleny沉降值等 ,数值高低主要由混合粉中原料和配粉比决定的 ;另一大类是表现“部分显性效应”的性状 ,如和面时间 ,面包体积和面包比容等 ,它们的数值高低主要受硬质小麦的原料和配粉比的影响。 (2 )混合粉的烘烤品质主要受面包小麦的面筋强度的影响。(3)搭配的硬质小麦在低比例时 ,对烘烤品质的改善更为明显。 (4 )表现混合粉品质的变化 ,应用和面仪曲线要比用蛋白质含量和Zeleny沉降值等性状更适宜、更可靠

对幼儿中“快乐的损人者”现象的初步研究

For studying the phenomenon of 'happy victimizer' in young children, the present experiment interviewed 4,5, and 6 years old children with understandable stories about enjoying effects in daily life, so as to investigate the development of their moral cognition and corresponding emotional attribution, for identifying whether they have acquired structural knowledge about social-moral rules, and whether moral events can raise their emotional reactions through moral consciousness.