Experimental Study of Capillary Effect in Porous Silicon Using Micro-Raman Spectroscopy and X-Ray Diffraction

We investigate the capillary effect and the residual stress evolution in the wetting, drying and rewetting stages of porous silicon using x-ray diffraction and micro-Raman spectroscopy. A reversible capillary effect and an irreversible oxidation effect are the driving forces for the residual stress evolution. The lattice expansion of the porous-silicon layer is observed to decrease slightly by x-ray diffraction and the tensile residual stress increases rapidly by micro-Raman spectroscopy, with the change of about 82 MPa for the oxidation effect and the change of 2.78 GPa (enough for cracking) for the capillary effect. Therefore, the capillary effect plays a major role in the residual stress evolution in the stages. A simple microscopic liquid-bridge model is introduced to explain the capillary effect and its reversibility. The capillary emergence has a close relation with a great deal of the micro-pore structure of porous silicon.     

原子物理中时间反演对称性成立吗：原子系统中永久电偶极矩的探查

本文将介绍在基本对称性研究领域具有重要意义但至今尚无答案的一项研究工作──微观粒子永久性电偶极矩的探查．其中重点介绍原子电偶极矩的探查．这一工作的意义在于它是对探索ＣＰ不守恒或Ｔ反演对称性破坏的来源的理论的检验；还在于微观粒子电偶极矩的非零值意味着电磁相互作用中时间反演对称性的破坏．本文将介绍这一工作的研究背景及其重要意义，基本概念，实验原理和方法．     

矿渣粉加固粉土的理论分析及路用性能研究

提出了矿渣粉加固粉土的相关理论。将矿渣粉在加固土中的作用归结为火山灰胶凝效应和微集料填充效应,而火山灰胶凝效应又可进一步归结为水化作用、激发作用和离子交换作用;认为微集料填充效应与矿渣粉细度极为相关;用框图归纳了矿渣粉加固土的两种作用效应。进行了矿渣粉、石灰粉加固土无侧限饱水抗压强度、水稳定性、冻稳定性、温度收缩和干燥收缩等路用性能试验,并进行比较。结果表明,矿渣粉加固土所测路用性能指标优于石灰粉加固土。为工程应用提供了试验依据。     

原子间偶极相互作用对辐射场非经典性的影响

研究了原子间的偶极－偶极相互作用力对相干态Ｔａｖｉｓ－Ｃｕｍｍｉｎｇｓ（Ｔ－Ｃ）模型中辐射场的压缩，振幅平方压缩和光子的反聚束效应的影响。     

集成铁电学与铁电集成薄膜

介绍了集成铁电学的基本概念，评述了当前集成铁电材料与器件研究中的主要问题，概略叙述了作者提出的铁电集成薄膜及其在多功能器件和灵巧器件上的应用。