Magnetic Activity and Parameters of 43 Flare Stars in the GWAC Archive

In the archive of the Ground Wide Angle Camera(GWAC), we found 43 white light flares from 43 stars, among which, three are sympathetic or homologous flares, and one of them also has a quasi-periodic pulsation with a period of 13.0 ± 1.5 minutes. Among these 43 flare stars, there are 19 new active stars and 41 stars that have available TESS and/or K2 light curves, from which we found 931 stellar flares. We also obtained rotational or orbital periods of 34 GWAC flare stars, of which 33 are less th...     

慈竹对小型落石的拦截效果分析CSCD

落石灾害是我国西南地区常见的一种小型崩塌。落石对下方公路、桥梁、铁路等基础设施安全造成严重威胁。因此,如何对落石进行有效的拦截就显得尤为重要。常见的拦截设施,如拦石沟,拦石网,挡墙等,在布设时极易受地形、施工等因素的限制,有时难以大面积地布置,导致拦挡效果大为减弱。我国的西南地区生长着大量慈竹,慈竹具有生长快、繁殖能力强、抗弯折等特点,对落石具有很好的拦截效果。文章通过模型试验与数值模拟相结合的方法,对慈竹的抗冲击能力进行了研究并提出了慈竹拦截小型落石的方案。结果如下:(1)慈竹破坏所需能量随着直径和壁厚的变大而上升,随着年龄、长重比和长径比的增大而降低;(2)一丛慈竹在抗冲击过程中最少能消耗3975.55 J能量,最多能消耗10890.88 J能量;(3)结合CRockfall软件进行慈竹落石拦截效应计算,结果显示拦截边坡高度43 m、直径0.5 m的危岩,需栽种2列3行6丛慈竹。