石墨炉原子吸收法测定水中的痕量钴

考察了石墨炉原子吸收法（ＧＦＡＡＳ）中不同基体改进剂对钴的灰化、原子化温度的影响,采用钯－锶为基体改进剂测定了自来水、井水及河水中的痕量钴,方法的灵敏度和检出限分别为０１５ｐｇ和０２１ｐｇ,回收率为９７８％～１０１３％。     

大熊猫毛发微量元素初析

用原子吸收分光光度法测定了四川野外和人工饲养的六十一头大熊猫毛发中 Zn、Cu、Mn、Fe、Ca、Mg 等六种元素的含量。看出:不同部位、不同颜色、根和稍部的微量元素含量都存在着某些差异;雄性和雌性的毛发中 Mn、Ca、Mg 存在着显著性差异;野外大熊猫毛发的六种元素含量高于人工饲养的大熊猫含量。     

Experimental measurements and theoretical calculations of the atomic structure of materials with subangstrom resolution and picometer precision

Lattice defects are unavoidable structural units in materials and play an important role in determining material properties. Compared with the periodic structure of crystals, the atomic configurations of the lattice defects are determined by the coordinates of a large number of atoms, making it difficult to experimentally investigate them. In computational materials science, multiparameter optimization is also a difficult problem and experimental verification is usually required to determine the possibility of obtaining the structure and properties predicted by cal- culations. Using our recent studies on oxide surfaces as examples, we introduce the method of integrated aberra- tion-corrected electron microscopy and the first-principles calculations to analyze the atomic structure of lattice defects. The atomic configurations of defects were mea- sured using quantitative high-resolution electron micros- copy at subangstrom resolution and picometer precision, and then the electronic structure and dynamic behavior of materials can be studied at the atomic scale using the first- principles calculations. The two methods complement each other and can be combined to increase the understanding of the atomic structure of materials in both the time and space dimensions, which will benefit materials design at the atomic scale.     

Molecular dynamics simulation of nanoscale contact and sliding processes for probes with different tip radius of curvature

Three-dimensional simulations were carried out molecular dynamics （MD） to study the contact and sliding processes between diamond points with different tip radius of curvature and surfaces of single crystal copper. The material deformation, abrasion mechanism, lattice defects, the force of contact process, and the sliding friction process were investigated. The simulation results show that the contact force, dislocations, and stacking fault defects, increase during the contact process with increasing contact depth or tip radius of curvature. The dislocations emit along the [10i-] and [i-01] direction and then a glide band is formed. It was also found that a greater tip radius of cur- vature results in a larger groove and more material defor- mation. The normal force and friction increase with increasing tip radius of curvature, but the coefficient of friction decreases. The stacking faults spread along the sliding direction and increase with increasing tip radius of curvature. In addition, the number of upheaval atoms increases as the radius of tip curvature or sliding distance increases.     

大学基础物理实验课教材的一些思考

大学基础物理实验教材应当以介绍实验如何实现、实验结果如何解释为中心,以探索和讨论的方式阐述现象、原理、方法和应用,尽量避免大量数学公式的推导,让学生对实验现象以及实验如何实现有所了解,体验到物理实验的乐趣。     

计算机模拟物理实验软件的研制

把现代教育技术引入教学,实现教学手段的现代化,有利于提高教学质量,是教学改革的重要内容．物理实验的计算机辅助教学已逐渐成为一种趋势,编写这个应用程序,旨在为解决这个问题做个有益的尝试．     

谈物理学史在教学中的运用

在物理课教学中适当运用物理学史,可以激发学生学习物理知识的兴趣,使学生从中得到 学习物理学的方法,加深理解物理学规律．还可以利用物理学史的内容对学生进行德育教 学。     

交叉流微孔聚丙烯中空纤维膜式氧合器研究

在自行建立的膜式氧合器水气传递实验装置上,分别对血气转流前后的MINIMAX PLUS^TM氧合器进行水气传递实验,测得了结构因子α,β,用Mockro和Leonard半径经数学模型拟合血中氧气传递速率,结果表明,新的MINIMAX PLUX^TM氧合器性能优良可靠,但经一次心内直视手术血气转流后,氧合器的血气传递效率明显下降（仅为原来的40％左右）,用原子力显微镜方法对氧合器中微孔聚丙烯中空纤维膜的微孔结构形态作显微研究,首次给出了微孔聚丙烯中空纤维膜在纳米尺度上的三维超微结构形貌图像及经血气转流前后纤维表面超微结构发生的尺寸变化,认为微孔中空纤维膜表面超微结构形态对氧合器的生物相容性及耐久性有直接影响。     

辩证逻辑基本范畴的推演过程对中学物理教学的启示

辩证逻辑思维是人类思维发展的高级阶段。自觉培养学生的辩证思维能力,是物理学科的重要职责之一。本通过揭示物理学中蕴涵的辩证逻辑基本范畴的推演过程,探讨了如何在中学物理教学中培养学生的辩证逻辑思维能力。     

弱Orlicz鞅空间的弱原子分解及其应用

对3类由凹函数生成的弱Orlicz鞅空间建立了相应的弱原子分解. 作为应用, 首先给出了这些弱Orlicz鞅空间上次线性算子有界的一个充分条件, 并在此基础上证明了一些弱型鞅不等式, 然后证明了关于这些弱Orlicz鞅空间的Marcinkiewicz 型插值定理.