关于刚体绕定点运动几个问题的探讨

本文从一个新的角度讨论了定点运动刚体运动方程的建立,推导了角速度、角加速度及任一点的速度、加速度的计算公式,并且举例说明了各个公式的应用。     

五阶段加工硬化理论

分析了金属塑性变形过程中,位错增殖、螺型位错交滑移和刃型位错攀移过程,建立了包括五个加工硬化阶段的位错理论模型。利用计算机,在不同的变形条件下,对理论模型进行了计算,计算结果和实验结果相当吻合。     

沥青乳化剂乳化效果的研究

用从造纸废液中提取的木质素与亚硫酸钠反应,合成磺化木素(EL-2-1)。以虹外、元素分析方法给予鉴定。二亚乙基三胺与油酸经缩合、环化反应,生成氨基乙基氢化咪唑啉。用EL-2-1、咪唑啉作乳化剂对胜利100~*乙道路沥青进行乳化效果的考察。试验结果表明,两种乳化剂均能较好地乳化胜利100~*乙道路沥青。沥青乳液的拌和稳定度试验结果表明,EL-2-1为慢裂型乳化剂;咪唑啉为快裂型乳化剂。     

Optimal switching from recording to fixing for high diffraction from a LiNbO3:Ce:Cu photorefractive nonvolatile hologram

An oscillatory characteristic of diffraction is observed as a result of strong beam coupling in a weakly oxidized LiNbO3:Ce:Cu crystal during the recording step in the production of nonvolatile photorefractive holograms. On this basis the optimal switching time from the recording step to the fixing step for high diffraction of a fixed hologram is studied. It is shown that switching after the first diffraction maximum leads theoretically to fixed diffraction of as much as 100% with a suitable switching time. Both an experimental demonstration and a theoretical simulation are presented.     

Boundary and particle number effects on the thermodynamic properties of trapped ideal Bose gases

The ideal noninteracting Bose gases trapped in a generic power-law potential in an any-dimensional space are studied. We present theoretical results of the corrections of thermodynamic properties due to finite particle number effects. The calculation uses the Euler-Maclaurin approximation to simplify the condensate fraction, and it also uses the Maslov index to discuss the boundary effect. Recently BEC (Bose-Einstein Condensation) has also been observed in a microelectronic chip; therefore, with a similar microstructure, we can obtain the effects of a rigid wall in a trap that have never been found before.Received: 3 January 2003, Published online: 23 July 2003PACS: 05.30.-d Quantum statistical mechanics     

Lesion location inside live tissues using the scattering of polarized light

The temporal intensity distributions of the transmitted light through the tissue with lesion structures are investigated using the polarized Monte Carlo technique. Simulation results show that time-resolved curves of transmitted light change obviously for different lesion structures. When the lesion thickness increases, the intensity of transmitted light decreases for co-polarization detection and increases for cross-polarization detection. With the increase of the lesion depth, the amplitude rises for both co- and cross-polarization detection. A method considering the dependence of the peak temporal distribution on the lesion position is thus proposed to locate lesions inside live tissues.     

柴油机排气颗粒中有机组分的分离方法及微量金属的测定

采用柱层析和化学方法将柴油机颗粒有机可溶成分按化学和物理性质分为有机碱，有机酸，脂肪类有机物，芳烃化合物，中极性有机物，高极性有机物6大类，并测定这些有机物质的百分组成及回收率，同时，使用等离子发射光谱法（ICP－AMS）分析了颗粒中金属物质的种类及相应的含量，研讨了金属物质的来源及对颗粒中部质量的影响。     

体育教学与学生的德育培养

本文主要从三大部分论述了体育教学与思想品德教育的关系,以意志力和责任心为主线,论述了体育教育工作者在实施教学过程中应注意的德育环节,通过实践教学来进行德育也是最为有效的手段.     

平衡式复合齿轮泵(马达)的变量原理

介绍了平衡式复合齿轮泵（马达）的工作原理，分析了复合齿轮泵流量特性，在此基础上设计出差动轮系式复合齿轮泵变量系统，并进行了分析。     

青鱼Mylopharyngodon piceus(Richardson)味觉器官的分布与功能之间关系的研究

青鱼Ｍｙｌｏｐｈａｒｙｎｇｏｄｏｎｐｉｃｅｕｓ（Ｒｉｃｈａｒｄｓｏｎ）是我国淡水养殖业中的“四大家鱼”之一（也是我国特产），它生活在水的中下层并以螺蛳、蚬、蚌等为主要食物．因此它的味觉器官味蕾的分布、数量、结构与功能，和生活在水的中上层并以浮游植物和浮游动物为主要饵料的鲢、鳙的滤食器官的结构与功能有所不同．主要报道青鱼味觉器官的分布与功能之间关系的研究结果．