Influence of the position relationship between gas–liquid interface and laser focus on plasma evolution characteristics in jet LIBS technology

In order to understand the characteristics of breakdown process, plasma evolution and spectral emission in liquid jets laser-induced breakdown spectroscopy methods under the influence of the position variation between laser focus and gas–liquid interface, this work takes the plasma generated by laser-induced liquid jets as the object of study and discusses the changes in the spatial and temporal evolution characteristics and spectral radiation of the plasma when the position parameters between t...     

基于垂荡运动波浪能发电PTO系统阻尼研究

波浪能作为海洋资源中储藏量最丰富的清洁能源，其发展前景十分广阔。因此，如何解决波浪能能量转换，实现波浪能最大层次的规模利用，是当前面临的关键问题。针对求解最优阻尼系数和最大发电功率，建立波浪能装置垂荡运动模型，分别讨论常数阻尼和线性阻尼两种情况下浮子和振子的垂荡运动以及对应的最优阻尼系数和发电功率。通过ODE45函数、变步长搜索法等精确求解得出：当系统采用常数阻尼时最大发电功率124.20 W，最优阻尼系数为37 940 N·s/m；当系统采用线性阻尼时最大发电功率为124.22 W，最优阻尼系数为46 025 N·s/m。