A global analysis of the ro-vibrational spectra of 19 bands in the comet-tail （A2Πi-X2Σ＋） system of the 12C16O＋ cation is presented, and the precise molecular constants of the vibrational levels involved are obt...A global analysis of the ro-vibrational spectra of 19 bands in the comet-tail （A2Πi-X2Σ＋） system of the 12C16O＋ cation is presented, and the precise molecular constants of the vibrational levels involved are obtained via a weighted nonlinear least-squares fitting procedure. Furthermore, the resultant precise equilibrium molecular constants enable us to achieve accurate Rydberg-Klein-Rees （RKR） potential curves for both the A and X states, yielding the accurate Franck-Condon factor and band origin of each band in this system.展开更多
目的探讨经胸超声慧星尾征在心力衰竭患者心功能评价中的应用。方法选取因急性呼吸困难入院患者187例,分为急性左心衰竭（acute left heart failure,ALHF）组和非急性左心衰竭（non-acute left heart failure,NALHF）组。对比分析两组...目的探讨经胸超声慧星尾征在心力衰竭患者心功能评价中的应用。方法选取因急性呼吸困难入院患者187例,分为急性左心衰竭（acute left heart failure,ALHF）组和非急性左心衰竭（non-acute left heart failure,NALHF）组。对比分析两组患者肺部超声彗星尾征（ULCs）数目,超声心动图测量LAD、LVEDD、E/Ea值和EF值,并绘制ROC曲线,计算曲线下面积并寻找最佳诊断分界点。结果 ALHF组患者ULCs数目、左心房内径（LAD）、左室舒张末内径（LVEDD）、E/Ea值均显著高于NALHF组,而EF值显著低于NALHF组,其差异有统计学意义（P〈0.05）。ROC曲线下面积为0.946（95%CI 0.921~0.971）,当彗尾数〉5条时,诊断心源性呼吸困难的特异性为79.6%（95%CI 66.5%~92.8%）,敏感性为92.7%（95%CI79.2%~95.3%）,阳性预测值为90.67%（95%CI 68.29%~96.17%）,阴性预测值为79.3%（95%CI 65.1%~86.9%）,诊断准确率为82.9%（155/187）。结论经胸超声慧星尾征能够简单、准确地评估心功能状态,临床上可列入急性呼吸困难的常规筛查。展开更多
基金the National Natural Science Foundation of China(Grant No.11034002)the State Key Development Program for Basic Research of China(Grant No.2011CB921602)+2 种基金the Natural Science Program of Nantong University,Chinathe State Key Laboratory of Precision Spectroscopy,ChinaQing Lan Project,China
文摘A global analysis of the ro-vibrational spectra of 19 bands in the comet-tail （A2Πi-X2Σ＋） system of the 12C16O＋ cation is presented, and the precise molecular constants of the vibrational levels involved are obtained via a weighted nonlinear least-squares fitting procedure. Furthermore, the resultant precise equilibrium molecular constants enable us to achieve accurate Rydberg-Klein-Rees （RKR） potential curves for both the A and X states, yielding the accurate Franck-Condon factor and band origin of each band in this system.
