A stereo-μ -PIV system for the measurement of all three components of the velocity vector in ameasurement plane (2D-3C) in a closed microchannel has been developed and first test measurements have beenperformed on the three-dimensional laminar flow in a T-shaped micromixer. Stereo-μ -PIV measurements in closedmicrochannels require a calibration based on the self-calibration of the tracer particle images. In order to include theeffects of different refractive indices of the water in the microchannel, the glass of the entrance window, and thesurrounding air a three-media-model is included in the triangulation procedure of the self calibration. A preliminarytest case shows that the stereo-μ -PIV results deviate less than 5% from theoretical values. First measurements in themixing zone of a T-shaped micromixer show that three-dimensional flow in a microchannel can be resolved,however, the accuracy of the measurements needs to be improved.
在瑞典西南部的莫恩达尔,地质年代学研究的重点是霍西卡湖附近的一种具有基性层和横切伟晶岩脉的混合岩。本研究利用锆石LA-ICPMS U-Pb测年法获得的年份即岩石的地质历史,并将混合岩与波罗的海地盾西段的Kallebä ck Suite相联系起来。岩浆结晶时代确定为1598± 13Ma,其混合岩化年龄与挪威西部段变质峰的1030Ma相匹配。