可压缩均匀各向同性湍流的直接数值模拟

采用8阶精度的中心差分格式及7阶精度的迎风偏斜格式对Reλ=72-153,Mt=0.2-0.7的均匀各向同性湍流进行了直接数值模拟，建立了湍流数据库。与他人的计算结果吻合十分理想，说明方法的有效性。数值结果表明，采用适当的迎风型差分格式可以克服起动问题（start-up problem)对湍流Mach数的限制，提高可计算的湍流Mach数，是可压湍流直接数值模拟的有效方法。分析了压缩性效应对湍流统计量的影响，发现压缩性使得湍动能的衰减加快。探讨了可压湍流中微激波产生的机理，对流场进行了标度律分析。发现在本文的Reynolds数和湍流Mach数条件下，流场中扩展自相似性仍然成立，同时发现压缩性对标度指数影响不大。

“神舟4号”飞船搭载微重力流体物理实验获得圆满成功

由中国科学院力学研究所胡文瑞院士和解京昌研究员领导的研究小组承担的“微重力液滴热毛细迁移实验”项目，利用自行研制的“通用流体实验装置”，于2002年12月30日搭载“神舟4号”飞船，圆满完成了各项预定空间实验任务。对飞船下传数据和图像的初步分析表明，实验装置全部工作正常，实验获得了圆满成功，可望得到有价值的学术成果，并在相关理论研究中取得突破。此次空间实验的成功，显示了科学家和工程师的完美结合，标志着力学所在“两弹一箭”后重返空间技术领域，再铸辉煌！

Rarefied gas dynamics: fundamentals, simulations and micro flows

Adiabatic shear localization: occurrence, theories, and applications

材料和结构的动态响应

《材料和结构的动态响应》是我国爆炸力学、冲击动力学领域的专家、教授、学者们为祝贺爆炸力学、冲击动力学专家王礼立教授七十华诞而撰写的一部学术著作，从不同的角度展示了我国乃至国际上近年来在该领域所取得的知识创新成果及学科发展动向，为促进爆炸力学、冲击动力学的理论创新和科技进步，造福人类，做出积极努力。

燃烧物理学基础

Optical recording properties of metal-azo dye as recording medium with super-resolution near-field structure

A novel metallized azo dye has been synthesized. The absorption spectra of the thin film and thermal characteristic are measured. Static optical recording properties with and without the Bi mask layer super-resolution near-field structure (Super-RENS) of the metal-azo dye are investigated. The results show that the metal-azo dye film has a broad absorbance band in the region of 450-650 nm and the maximum absorbance wavelength is located at 603 nm. It is also found that the new metallized azo dye occupies excellent thermal stability, initiatory decomposition temperature is at 270 degrees C and the mass loss is about 48% in a narrow temperature region (15 degrees C). The complex refractive index N (N = n + ik) is measured. High refractive index (n = 2.45) and low extinction coefficient (k = 0.2) at the recording wavelength 650nm are attained. Static optical recording tests with and without Super-RENS are carried out using a 650nm semiconductor diode laser with recording power of 7mW and laser pulse duration of 200ns. The AFM images show that the diameter of recording mark on the dye film with the Bi mask layer is reduced about 42%, compared to that of recorded mark on the dye film without Super-RENS. It is indicated that Bi can well performed as a mask layer of the dye recording layer and the metallized azo dye can be a promising candidate for recording media with the super-resolution near-field structure.

Analysis on a new type magneto-optical disk for blue lasers

The conventional TbFeCo magneto-optical (MO) medium has a relatively smaller Kerr rotation angle in the blue region than in the red. With the recording wavelength gradually moving to the short wavelength, if TbFeCo is still used as recording medium, the conventional MO disk structure must be optimized to get a larger carrier to noise ratio (CNR). Sabi et al. have found that adding a metal layer attached to the TbFeCo film as thermal control layer is a useful way to get a high CNR. In this paper, we proved this through calculation, and carried out optimization of the new type of disk. Calculation results showed that the new structure is useful in preventing an excessive temperature increase, and has a better thermal response. (c) 2005 Elsevier B.V. All rights reserved.

轴向为烷氧基配位的萘酞菁硅配合物的光谱及光稳定性

研究了4种轴向为烷氧基配位的萘酞菁硅配合物（NcSi（OR）2，R为CH3、C2H3、C3H7和C4H9）在DMSO、DMF、CH2Cl2中的Q带吸收光谱和光降解动力学及其稳定性。研究结果表明，这4种萘酞菁配合物在相同溶剂中随着轴向配位烷氧基碳链的增长其最大吸收波长逐渐增加，并且在DMSO、CH2Cl2溶剂中随着轴向配位烷氧基碳链的增长光稳定性逐渐增强；对于同一配合物，溶剂对其光稳定性影响顺序为：DMSO〉CH2Cl2〉DMF。

Structural and up-conversion luminescence properties in Tm (3+)/Yb3+-codoped heavy metal oxide-halide glasses

Tm3+/Yb3+-codoped heavy metal oxide-halide glasses have been synthesized by conventional melting and quenching method. Structural properties were obtained based on the Raman spectra, indicating that halide ion has an important influence on the phonon density and maximum phonon energy of host glasses. Intense blue and weak red emissions centered at 477 and 650 nm, corresponding to the transitions (1)G(4) -> H-3(6) and (1)G(4) -> H-3(4), respectively, were observed at room temperature. The possible up-conversion mechanisms are discussed and estimated. With increasing halide content, the up-conversion luminescence intensity and blue luminescence lifetimes of Tm3+ ion increase notably. Our results show that with the substitution of halide ion for oxygen ion, the decrease of phonon density and maximum phonon energy of host glasses both contribute to the enhanced up-conversion emissions. (c) 2005 Elsevier B.V. All rights reserved.

Growth of excellent-quality Nd : LuVO4 single crystal and laser properties

High-quality Nd:LuVO4 single crystal was successfully grown by Czochralski method. The assessment of the crystalline quality by the chemical etching method and Conoscope image was reported. The absorption spectra from 300 to 1000 nm and emission spectra from 960 to 1450 nm of Nd: LuVO4 were measured. Laser performance was achieved with Nd:LUVO4 crystal for the transition of F-4(3/2) -> I-4(11/2) (corresponding wavelength 1065.8 nm) in an actively Q-switched operation, and the average output power reached 5.42 W at a pulse repetition frequency (PRF) of 40 kHz under pump power of 18 W, giving an optical conversion efficiency of 30.1%. The pulse energy and peak power reached 138 mu J and 16.2 kW at PRF of 25 kHz under pump power of 14.2 W, and the pulse duration was 8.5 ns. (c) 2005 Elsevier B.V. All rights reserved.