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内爆炸下扁平大空间中柱表面荷载的确定
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作者 刘中辉 匡志平 《结构工程师》 2023年第6期44-53,共10页
为研究地下停车场等扁平大空间内发生爆炸时中间柱所受到的爆炸荷载,采用AUTODYN软件分析了比例距离、截面尺寸和柱高对中柱迎、背爆面爆炸荷载的影响情况。爆炸荷载采用中柱迎爆面底部中心反射超压峰值和反射比冲量,以及迎、背爆面任... 为研究地下停车场等扁平大空间内发生爆炸时中间柱所受到的爆炸荷载,采用AUTODYN软件分析了比例距离、截面尺寸和柱高对中柱迎、背爆面爆炸荷载的影响情况。爆炸荷载采用中柱迎爆面底部中心反射超压峰值和反射比冲量,以及迎、背爆面任意高度处归一化反射超压峰值和归一化反射比冲量来表征。研究表明,截面宽度对柱迎爆面底部中心反射超压峰值和反射比冲量有较大影响,该影响随比例距离的增加而减小,柱高对其几乎没影响;截面宽度和柱高对中柱迎、背爆面归一化反射超压峰值和归一化反射比冲量的影响很小;比例距离对迎爆面归一化反射超压的影响在柱身相对高度大于0.8处较大,对背爆面归一化反射超压峰值和迎、背爆面归一化反射比冲量影响较小。最后,给出并验证了内爆炸下扁平大空间中柱爆炸荷载表征量的计算公式。 展开更多
关键词 内部爆炸荷载 扁平大空间 中柱表面 超压峰值 比冲量
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Effect of a Traditional Chinese Medicine combined therapy on adolescent idiopathic scoliosis:a randomized controlled trial 被引量:9
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作者 Wei Hui Xu Jinyuan +9 位作者 Jiang Zhong Ye Shuliang Song Hongquan Ning Xitao Huang Huanmin Chen Wei Pei Jianwei Jiang Nengyi Chen Shao Du Honggen 《Journal of Traditional Chinese Medicine》 SCIE CAS CSCD 2015年第5期514-519,共6页
OBJECTIVE:To evaluate the effectiveness of a combined Traditional Chinese Medicine(TCM) therapy versus conventional treatment on adolescent idiopathic scoliosis.METHODS:One hundred twenty outpatients with mild and mod... OBJECTIVE:To evaluate the effectiveness of a combined Traditional Chinese Medicine(TCM) therapy versus conventional treatment on adolescent idiopathic scoliosis.METHODS:One hundred twenty outpatients with mild and moderate adolescent idiopathic scoliosis were randomly divided into a TCM group(TCMG)and a brace group(CG).TCMG patients underwent Daoyin,Tuina,and acupotomology therapies.CG patients were treated with a Milwaukee brace.Each patient's Cobb angle was measured after 12 and 24 months of treatment,and pulmonary function was determined after 12 months of treatment.Average electromyogram(AEMG) ratio of the surface electromyogram was measured after 6 and 12 months of treatment and followed-up after 18 and 24 months.RESULTS:The Cobb angle significantly decreased in both groups after 12 months of treatment compared with before treatment(P< 0.05).The percentages of original Cobb angle in TCMG and CG were51.4%and 47.8%(P > 0.05) after 12 months and62.5%and 34.7%(P < 0.05) after 24 months,respectively.Pulmonary function significantly improved after 12 months in TCMG(P < 0.05) but significantly decreased in CG(P < 0.05).The AEMG ratio was significantly lower(P < 0.01) and tended to remain at1 after stopping treatment in TCMG,but increased in CG(P<0.05).CONCLUSION:TCM combined therapy can prevent the progression of scoliosis.The AEMG ratio is a promising index that could replace radiography in the evaluation of treatment effect and progression in scoliosis. 展开更多
关键词 Medicine Chinese traditional Scoliosis Adolescent Electromyography Treatment outcome Respiratory function tests Randomized controlled trial
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