Although approximately one million sudden cardiac deaths occur yearly in the US and Europe,cardiac arrest (CA)remains a clinical condition still characterized by a poor prognosis.In an effort to improve the cardio- pu...Although approximately one million sudden cardiac deaths occur yearly in the US and Europe,cardiac arrest (CA)remains a clinical condition still characterized by a poor prognosis.In an effort to improve the cardio- pulmonary resuscitation(CPR)technique,the 2005 American Heart Association(AHA)Guidelines for CPR gave the impedance threshold device(ITD)a Class IIa recommendation.The AHA recommendation means that there is strong evidence to demonstrate that ITD enhances circulation,improves hemodynamics and increases the likelihood of resuscitation in patients in CA.During standard CPR,venous blood return to the heart relies on the natural elastic recoil of the chest which creates a transient decrease in intrathoracic pressure.The ITD further decreases intrathoracic pressure by preventing respiratory gases from entering the lungs during the decompression phase of CPR. Thus,although ITD is placed into the respiratory circuit it works as a circulatory enhancer device that provides its therapeutic benefit with each chest decompression. The ease of use of this device,its ability to be incor- porated into a mask and other airway devices,the absence of device-related adverse effects and few requirements in additional training,suggest that ITD may be a favorable new device for improving CPR efficiency.Since the literature is short of studies with clinically meaningful outcomes such as neurological outcome and long term survival,further evidence is still needed.展开更多
We investigate the target and intensity dependence of plateau in high-order above threshold ionization（HATI） by simulating the two-dimensional（2D） momentum distributions and the energy spectra of photoelectrons in...We investigate the target and intensity dependence of plateau in high-order above threshold ionization（HATI） by simulating the two-dimensional（2D） momentum distributions and the energy spectra of photoelectrons in HATI of rare gas atoms through using the quantitative rescattering model. The simulated results are compared with the existing experimental measurements. It is found that the slope of the plateau in the HATI photoelectron energy spectrum highly depends on the structure of elastic scattering differential cross section（DCS） of laser-induced returning electron with its parent ion. The investigations of the long- and short-range potential effects in the DCSs reveal that the short-range potential, which reflects the structure of the target, plays an essential role in generating the HATI photoelectron spectra.展开更多
由于加工工艺的影响,应用零件表面划痕形态也会呈现出多种不同的表现形式,受到背景纹理样式的干扰,零件表面的细微划痕依然难以得到准确分辨与检测,为解决此问题,设计基于深度学习的零件表面细微划痕检测方法。在深度学习网络的彩色空...由于加工工艺的影响,应用零件表面划痕形态也会呈现出多种不同的表现形式,受到背景纹理样式的干扰,零件表面的细微划痕依然难以得到准确分辨与检测,为解决此问题,设计基于深度学习的零件表面细微划痕检测方法。在深度学习网络的彩色空间环境中,对滞后多阈值进行分割处理,再联合投资回报率(return on investment, ROI)提取权限条件,完成基于深度学习的划痕特征参量提取。在此基础上,建立边缘模板,通过处置细微划痕配准需求的方式,实现对划痕的准确定位,完成基于深度学习零件表面细微划痕检测方法的设计与应用。与机器视觉型检测方法相比,深度学习型检测方法能够根据划痕所表现出的具体形态,对其进行检测与分辨,可避免背景纹理样式对于零件加工工艺的影响。展开更多
文摘Although approximately one million sudden cardiac deaths occur yearly in the US and Europe,cardiac arrest (CA)remains a clinical condition still characterized by a poor prognosis.In an effort to improve the cardio- pulmonary resuscitation(CPR)technique,the 2005 American Heart Association(AHA)Guidelines for CPR gave the impedance threshold device(ITD)a Class IIa recommendation.The AHA recommendation means that there is strong evidence to demonstrate that ITD enhances circulation,improves hemodynamics and increases the likelihood of resuscitation in patients in CA.During standard CPR,venous blood return to the heart relies on the natural elastic recoil of the chest which creates a transient decrease in intrathoracic pressure.The ITD further decreases intrathoracic pressure by preventing respiratory gases from entering the lungs during the decompression phase of CPR. Thus,although ITD is placed into the respiratory circuit it works as a circulatory enhancer device that provides its therapeutic benefit with each chest decompression. The ease of use of this device,its ability to be incor- porated into a mask and other airway devices,the absence of device-related adverse effects and few requirements in additional training,suggest that ITD may be a favorable new device for improving CPR efficiency.Since the literature is short of studies with clinically meaningful outcomes such as neurological outcome and long term survival,further evidence is still needed.
基金Project supported by the National Natural Science Foundation of China(Grant No.11274219)the STU Scientific Research Foundation for Talentsthe Scientific Research Foundation for the Returned Overseas Chinese Scholars,State Education Ministry,China
文摘We investigate the target and intensity dependence of plateau in high-order above threshold ionization（HATI） by simulating the two-dimensional（2D） momentum distributions and the energy spectra of photoelectrons in HATI of rare gas atoms through using the quantitative rescattering model. The simulated results are compared with the existing experimental measurements. It is found that the slope of the plateau in the HATI photoelectron energy spectrum highly depends on the structure of elastic scattering differential cross section（DCS） of laser-induced returning electron with its parent ion. The investigations of the long- and short-range potential effects in the DCSs reveal that the short-range potential, which reflects the structure of the target, plays an essential role in generating the HATI photoelectron spectra.
文摘由于加工工艺的影响,应用零件表面划痕形态也会呈现出多种不同的表现形式,受到背景纹理样式的干扰,零件表面的细微划痕依然难以得到准确分辨与检测,为解决此问题,设计基于深度学习的零件表面细微划痕检测方法。在深度学习网络的彩色空间环境中,对滞后多阈值进行分割处理,再联合投资回报率(return on investment, ROI)提取权限条件,完成基于深度学习的划痕特征参量提取。在此基础上,建立边缘模板,通过处置细微划痕配准需求的方式,实现对划痕的准确定位,完成基于深度学习零件表面细微划痕检测方法的设计与应用。与机器视觉型检测方法相比,深度学习型检测方法能够根据划痕所表现出的具体形态,对其进行检测与分辨,可避免背景纹理样式对于零件加工工艺的影响。
