An experiment was carried out on the friction stir welding of MB3 magnesium alloy to determine welding parameters for obtaining an excellent weld appearance without void, cracking, or distortion. Frictional heat and p...An experiment was carried out on the friction stir welding of MB3 magnesium alloy to determine welding parameters for obtaining an excellent weld appearance without void, cracking, or distortion. Frictional heat and plastic flow created fine and equiaxed grains in the weld nugget, and the elongated and recovered grains in the thermomechanically affected zone （TMAZ）. The grains in the heat affected zone （HAZ） grow slightly. The me- chanical property results show that maximum joint tensile strength can reach 97. 2% of the parent material, which is stronger than that of fusion joints; and the failure almost occurs in the heat affected zone.展开更多
A stop band gap is predicted in periodic layers of a confined atomic vapor/dielectric medium.Reflection and transmission profile of the layers over the band gap can be dramatically modified by the confined atoms and t...A stop band gap is predicted in periodic layers of a confined atomic vapor/dielectric medium.Reflection and transmission profile of the layers over the band gap can be dramatically modified by the confined atoms and the number of layer periods.These gap and line features can be ascribed to the enhanced contribution of slow atoms induced by atom-wall collision,transient behavior of atom-light interaction and Fabry–Pérot effects in a thermal confined atomic system.展开更多
配电网无功优化时,大多数情况下对负荷数据的处理往往只针对某一运行状况下的具体数据,很难对某个运行阶段的多个工况数据进行分类处理。针对上述问题文章提出一种基于卷积神经网络VGG16(Visual Geometry Group Network)的优化方法。首...配电网无功优化时,大多数情况下对负荷数据的处理往往只针对某一运行状况下的具体数据,很难对某个运行阶段的多个工况数据进行分类处理。针对上述问题文章提出一种基于卷积神经网络VGG16(Visual Geometry Group Network)的优化方法。首先按台区变压器的容量占比来进行分类,得到轻、中、高三类场景,再利用粒子群算法对每类场景进行优化,得出对应的优化策略。通过仿真验证了本方法对解决台区动态无功电压问题的有效性。展开更多
文摘An experiment was carried out on the friction stir welding of MB3 magnesium alloy to determine welding parameters for obtaining an excellent weld appearance without void, cracking, or distortion. Frictional heat and plastic flow created fine and equiaxed grains in the weld nugget, and the elongated and recovered grains in the thermomechanically affected zone （TMAZ）. The grains in the heat affected zone （HAZ） grow slightly. The me- chanical property results show that maximum joint tensile strength can reach 97. 2% of the parent material, which is stronger than that of fusion joints; and the failure almost occurs in the heat affected zone.
基金Supported by the Science and Technology Project of Xi’an(No CXY1134WL02).
文摘A stop band gap is predicted in periodic layers of a confined atomic vapor/dielectric medium.Reflection and transmission profile of the layers over the band gap can be dramatically modified by the confined atoms and the number of layer periods.These gap and line features can be ascribed to the enhanced contribution of slow atoms induced by atom-wall collision,transient behavior of atom-light interaction and Fabry–Pérot effects in a thermal confined atomic system.
文摘配电网无功优化时,大多数情况下对负荷数据的处理往往只针对某一运行状况下的具体数据,很难对某个运行阶段的多个工况数据进行分类处理。针对上述问题文章提出一种基于卷积神经网络VGG16(Visual Geometry Group Network)的优化方法。首先按台区变压器的容量占比来进行分类,得到轻、中、高三类场景,再利用粒子群算法对每类场景进行优化,得出对应的优化策略。通过仿真验证了本方法对解决台区动态无功电压问题的有效性。
