[目的]系统评价内关穴按压对缓解癌症病人化疗引起恶心、呕吐症状的临床疗效。[方法]计算机检索Medline、EMbase、Cochrane Library、CINAHL、Web of Science、中国生物医学数据库、万方数据库、中国知网和重庆维普中文科技期刊数据库,...[目的]系统评价内关穴按压对缓解癌症病人化疗引起恶心、呕吐症状的临床疗效。[方法]计算机检索Medline、EMbase、Cochrane Library、CINAHL、Web of Science、中国生物医学数据库、万方数据库、中国知网和重庆维普中文科技期刊数据库,检索时间为建库至2018年12月4日,收集内关穴按压缓解癌症病人化疗引起恶心、呕吐症状的随机对照试验研究,采用Revman5.3软件进行统计学分析。[结果]共纳入11篇文献,涉及癌症化疗病人606例;Meta分析结果显示,与对照组相比,试验组内关穴按压能有效改善癌症病人化疗引起的恶心症状的严重程度[MD=-1.75,95%CI(-2.95,-0.55),P=0.004]、呕吐症状严重程度[MD=-1.10,95%CI(-1.87,-0.33),P=0.005]、恶心症状发生频率[MD=-0.84,95%CI(-1.37,-0.31),P=0.002]、呕吐症状发生频率[MD=-0.64,95%CI(-1.24,-0.05),P=0.03]和干呕发生频率[MD=-0.31,95%CI(-0.53,-0.09),P=0.006];而在改善干呕症状的严重程度[MD=-0.40,95%CI(-0.90,0.10),P=0.12]和呕吐症状经历时间[MD=-0.52,95%CI(-1.21,0.17),P=0.14]方面效果不明显。[结论]当前证据表明,内关穴按压能改善癌症病人化疗引起恶心、呕吐症状严重程度,降低恶心、呕吐和干呕的发生频率,但在改善干呕严重程度和呕吐经历时间方面效果不明显。展开更多
Theoretical analysis of the electromagnetic field distribution in the focal region of a long metallic parabolic reflector that has its surface covered with a magnetized plasma layer is derived. The incident wave is co...Theoretical analysis of the electromagnetic field distribution in the focal region of a long metallic parabolic reflector that has its surface covered with a magnetized plasma layer is derived. The incident wave is considered to be with a general oblique incidence for both parallel and perpendicular polarizations. The electromagnetic field intensity expressions along the focal region are obtained accurately using Maslov＇s method. The effects of plasma thickness on the reflected and transmitted field distributions are investigated. The effects of other physi- cal parameters such as the angle of incidence and the plasma and cyclotron frequencies on the transmitted field- intensity distribution along the focal region are also studied. The results obtained by Maslov＇s method and Kirchhoff＇s approximation are found to be in a good agreement.展开更多
为从根本上改善最小断点集(minimum break point set,MBPS)适应系统结构非预设性变化的水平,提出多区域复杂环网最小断点集求取及更新算法。在静态网络拓扑情况下,利用保护关联矩阵并行计算各子区域的最小断点集,在此基础上,优化计算主...为从根本上改善最小断点集(minimum break point set,MBPS)适应系统结构非预设性变化的水平,提出多区域复杂环网最小断点集求取及更新算法。在静态网络拓扑情况下,利用保护关联矩阵并行计算各子区域的最小断点集,在此基础上,优化计算主区域的最小断点集,并据此确定全网最小断点集。在网络变结构的情况下,基于广义断点集提出单区域最小断点集更新方案,并将其推广至多区域网络,在主区域、子区域及单线路联络节点发生变结构情况下,快速更新最小断点集。典型的5区域68节点系统计算结果表明:该方法在最小断点集求取方面,不但能够保证全网断点数目合理,还能提高最小断点集的计算速度;在最小断点集更新方面,该方法仅需处理变结构所关联区域的最小断点集,即可实现全网最小断点集更新,有效地降低了复杂环网最小断点集更新的复杂性,计算量小,适用于多种网络变结构情况。展开更多
文摘[目的]系统评价内关穴按压对缓解癌症病人化疗引起恶心、呕吐症状的临床疗效。[方法]计算机检索Medline、EMbase、Cochrane Library、CINAHL、Web of Science、中国生物医学数据库、万方数据库、中国知网和重庆维普中文科技期刊数据库,检索时间为建库至2018年12月4日,收集内关穴按压缓解癌症病人化疗引起恶心、呕吐症状的随机对照试验研究,采用Revman5.3软件进行统计学分析。[结果]共纳入11篇文献,涉及癌症化疗病人606例;Meta分析结果显示,与对照组相比,试验组内关穴按压能有效改善癌症病人化疗引起的恶心症状的严重程度[MD=-1.75,95%CI(-2.95,-0.55),P=0.004]、呕吐症状严重程度[MD=-1.10,95%CI(-1.87,-0.33),P=0.005]、恶心症状发生频率[MD=-0.84,95%CI(-1.37,-0.31),P=0.002]、呕吐症状发生频率[MD=-0.64,95%CI(-1.24,-0.05),P=0.03]和干呕发生频率[MD=-0.31,95%CI(-0.53,-0.09),P=0.006];而在改善干呕症状的严重程度[MD=-0.40,95%CI(-0.90,0.10),P=0.12]和呕吐症状经历时间[MD=-0.52,95%CI(-1.21,0.17),P=0.14]方面效果不明显。[结论]当前证据表明,内关穴按压能改善癌症病人化疗引起恶心、呕吐症状严重程度,降低恶心、呕吐和干呕的发生频率,但在改善干呕严重程度和呕吐经历时间方面效果不明显。
基金the Deanship of Scientific Research at King Saud University for its funding of this work through the Research Group Project No. RG-1436-001
文摘Theoretical analysis of the electromagnetic field distribution in the focal region of a long metallic parabolic reflector that has its surface covered with a magnetized plasma layer is derived. The incident wave is considered to be with a general oblique incidence for both parallel and perpendicular polarizations. The electromagnetic field intensity expressions along the focal region are obtained accurately using Maslov＇s method. The effects of plasma thickness on the reflected and transmitted field distributions are investigated. The effects of other physi- cal parameters such as the angle of incidence and the plasma and cyclotron frequencies on the transmitted field- intensity distribution along the focal region are also studied. The results obtained by Maslov＇s method and Kirchhoff＇s approximation are found to be in a good agreement.
文摘为从根本上改善最小断点集(minimum break point set,MBPS)适应系统结构非预设性变化的水平,提出多区域复杂环网最小断点集求取及更新算法。在静态网络拓扑情况下,利用保护关联矩阵并行计算各子区域的最小断点集,在此基础上,优化计算主区域的最小断点集,并据此确定全网最小断点集。在网络变结构的情况下,基于广义断点集提出单区域最小断点集更新方案,并将其推广至多区域网络,在主区域、子区域及单线路联络节点发生变结构情况下,快速更新最小断点集。典型的5区域68节点系统计算结果表明:该方法在最小断点集求取方面,不但能够保证全网断点数目合理,还能提高最小断点集的计算速度;在最小断点集更新方面,该方法仅需处理变结构所关联区域的最小断点集,即可实现全网最小断点集更新,有效地降低了复杂环网最小断点集更新的复杂性,计算量小,适用于多种网络变结构情况。
