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利用2D-STI技术测量肝硬化患者的左室局部收缩功能，探讨不同Child-Pugh分级肝硬化患者左室收缩功能与肝硬化发展程度的相关性与临床价值。 方法 选取肝硬化患者60例为肝硬化组，将患者根据Child-Pugh分级的A、B、C 3个等级对应分为A、B、C 3组；选取与肝硬化组相同时间段内年龄、性别均相匹配的门诊健康体检者30例为正常对照组。测量常规指标，并分析心尖四腔切面、心尖三腔切面和心尖两...
Researchers in the US have built the first practical device that can cloak an object from being detected by sound waves. The cloak, which is made from a cylindrical array of acoustic cavities, has bee...
Angular dependence and mode distribution of acoustic phonon emission by hot 2D electrons in GaAs/AlGaAs heterojunctions and quantum wells
2D electron gas transverse acoustic
2010/4/16
We report a detailed theoretical study of the angular dependence and mode distribution of the acoustic phonon emission by hot two-dimensional electron gases in GaAs/AlGaAs heterojunctions and quantum ...