第一届Batchelor奖获得者Howard Stone教授研究工作简评

Batchelor流体力学奖和Hill固体力学奖是国际理论与应用力学联合会(IUTAM)设立的两个奖项,旨在表彰获奖者过去十年内在其力学分支学科研究中所做出的重要贡献.Batchelor流体力学奖和Hill固体力学奖每4年评选一次,在第22届国际理论与应用力学大会(8月24～29日,澳大利亚阿德莱德)上第一次颁奖.Howard Stone教授和Michael Ortiz教授分别是Batchelor奖和Hill奖的获奖人.本刊在《简评》栏目刊登胡国庆研究员和黎波教授对两位获奖者成果的简评,并在《译文》栏目刊登两位教授的代表性论文的译文各一篇,以饷读者.

The effect of strain softening in the matrix material during void growth

Furthermore, the compressed flow driven by the piston is discussed. The consistent solution of gasdynamical equations including solar gravity is obtained for the unsteady and two-dimensional configuration, which is applied to the region between the piston and shock wave. This solution may satisfy the jump conditions of shock wave, which separates the region of compressed flow and quiet corona.

微通道中应用“流动汇聚”形成分散体系

在微流控器件内集成具有流动汇聚功能的几何结构以研究液-液系统中液滴的形成.相图显示液滴的大小为流量以及两种液体流量比的函数,它包括两个区域,在一个区域中液滴大小和孔隙宽度接近,而在另一区域液滴大小则取决于"汇聚"后的细流直径,从而能形成远小于孔隙的液滴.单分散和多分散乳状液均可以被生成.

A planar waveguide Nd : YAG laser using active Q-switching of a hybrid unstable resonator

A planar waveguide laser operating in a negative branch unstable resonator is Q-switched by an acoustooptic mod latorin anew configuration, providing effective, high-speed switching. The laser using a 200-mu m Nd:YAG core, face pumped by 10 laser diode bars, has produced 100-W output in a good beam quality at 100-kHz pulse rate, and 4.5 mJ at lower frequency with 15-ns pulse duration.