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开孔对热塑性复合材料层合板抗反复冲击性能影响的研究 被引量:4
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作者 彭丕 王继辉 +1 位作者 陈宏达 骆传龙 《玻璃钢/复合材料》 CAS 北大核心 2019年第11期100-104,共5页
研究了孔与冲击点的距离对玻璃纤维增强聚丙烯复合材料层合板抗反复冲击性能的影响。采用热压成型工艺制备了连续玻璃纤维增强聚丙烯层合板,通过落锤冲击试验机对层合板进行反复冲击,直至其发生完全穿透,获得冲击响应的相关数据。结果表... 研究了孔与冲击点的距离对玻璃纤维增强聚丙烯复合材料层合板抗反复冲击性能的影响。采用热压成型工艺制备了连续玻璃纤维增强聚丙烯层合板,通过落锤冲击试验机对层合板进行反复冲击,直至其发生完全穿透,获得冲击响应的相关数据。结果表明:孔与冲击点的距离d对玻纤增强聚丙烯层合板抗反复冲击性能的影响显著,就一次冲击而言,距离d越大,最大接触力越大,位移和吸收能量反而越小。相比于无孔层合板,d为5 mm、10 mm、15 mm、20 mm的开孔板抗反复冲击的次数分别降低了88. 1%、57. 6%、20. 3%、3. 3%。反复冲击过程中,d=5 mm和d=10 mm开孔板的最大接触力存在峰值点,开孔促进了层合板吸收冲击能量,每次冲击的吸收能量随着冲击次数的增加而缓慢增加。 展开更多
关键词 复合材料 开孔 抗反复冲击
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活血散结中药复方含药血浆对bFGF干预下兔RPE细胞Bax、Bcl-2表达的影响 被引量:1
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作者 蔡娅仙 罗萍 +4 位作者 彭俊 李建超 彭抿 吴权龙 彭清华 《亚太传统医药》 2021年第7期20-22,共3页
目的:探索活血散结中药复方含药血浆对碱性成纤维细胞生长因子(bFGF)干预下兔视网膜色素上皮(RPE)细胞Bax、Bcl-2蛋白表达的影响。方法:选用对数生长期兔RPE细胞,分为正常血浆组、bFGF组、bFGF+BGJ398组、bFGF+含药血浆组,Western blott... 目的:探索活血散结中药复方含药血浆对碱性成纤维细胞生长因子(bFGF)干预下兔视网膜色素上皮(RPE)细胞Bax、Bcl-2蛋白表达的影响。方法:选用对数生长期兔RPE细胞,分为正常血浆组、bFGF组、bFGF+BGJ398组、bFGF+含药血浆组,Western blotting法检测各组兔RPE细胞Bcl-2、Bax蛋白表达情况,观察活血散结中药复方含药血浆作用后RPE细胞Bcl-2、Bax蛋白在兔RPE细胞中的表达。结果:bFGF+含药血浆组与bFGF比较,Bax蛋白表达明显增强,Bcl-2蛋白表达明显抑制,差别均有显著统计学意义(P<0.01)。结论:活血散结中药复方含药血浆作用于bFGF干预下所致增生性玻璃体视网膜病变(PVR)的细胞模型,可促进RPE细胞Bax蛋白的表达,同时抑制Bcl-2蛋白的表达,使Bax/Bcl-2构成比升高。 展开更多
关键词 活血散结中药复方 含药血浆 视网膜色素上皮细胞 Bcl-2 BAX
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Relationship between infection,physical and mental health and exercise habits of some Chinese residents after recovery from COVID-19
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作者 Aiyi Zhou Yuncan Xia +3 位作者 peng pi Zhengzhen Wang Hongmei Huang Yan Wang 《Sports Medicine and Health Science》 2024年第3期260-265,共6页
This study aimed to determine the infection status,exercise habits,anxiety levels,and sleep quality in Chinese residents who recovered from infection during the period of coronavirus disease 2019(COVID-19)period.It al... This study aimed to determine the infection status,exercise habits,anxiety levels,and sleep quality in Chinese residents who recovered from infection during the period of coronavirus disease 2019(COVID-19)period.It also aimed to investigate the influencing factors of recovery status and aid in improving intervention measures for COVID-19 recovery.This study is a sub-study nested within a cross-sectional investigation of infection and physical and mental health among partially recovered residents in all 34 provincial areas of China during the COVID-19 pandemic.A total of 1013 participants(374 males and 639 females)completed the study.Cardiopulmonary endurance was significantly lower after infection than before infection(p<0.001).Women(3.924.97)exhibited higher levels of anxiety than men(3.334.54,p?0.015).The sleep score was significantly higher after infection(8.277.05)than before infection(4.174.97,p<0.001).The active and regular exercise groups exhibited significantly shorter durations of fever than the sedentary and irregular groups(p?0.033;p?0.021).Additionally,the active group demonstrated significantly fewer recovery days([7.323.24]days)than the sedentary group([7.663.06]days,p?0.035).We found a correlation between age and the recovery time of symptoms after COVID-19.We noted that a greater number of symptoms corresponded to poorer cardiopulmonary fitness and sleep quality.Individuals who engage in sedentary lifestyles and irregular exercise regimens generally require prolonged recovery periods.Therefore,incorporating moderate exercise,psychological support,sleep hygiene and other health interventions into post-COVID-19 recovery measures is imperative. 展开更多
关键词 COVID-19 infection Post-recovery of COVID-19 Recovery status Cardiopulmonary endurance Anxiety Sleep quality
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