The frequency–space（f–x） empirical mode decomposition（EMD） denoising method has two limitations when applied to nonstationary seismic data. First, subtracting the first intrinsic mode function（IMF） results in ...The frequency–space（f–x） empirical mode decomposition（EMD） denoising method has two limitations when applied to nonstationary seismic data. First, subtracting the first intrinsic mode function（IMF） results in signal damage and limited denoising. Second, decomposing the real and imaginary parts of complex data may lead to inconsistent decomposition numbers. Thus, we propose a new method named f–x spatial projection-based complex empirical mode decomposition（CEMD） prediction filtering. The proposed approach directly decomposes complex seismic data into a series of complex IMFs（CIMFs） using the spatial projection-based CEMD algorithm and then applies f–x predictive filtering to the stationary CIMFs to improve the signal-to-noise ratio. Synthetic and real data examples were used to demonstrate the performance of the new method in random noise attenuation and seismic signal preservation.展开更多
目的:探讨盐酸氨溴索支气管肺泡灌洗联合机械通气治疗对慢性阻塞性肺疾病(Chronic Obstructive Pulmonary Disease,COPD)合并重症肺炎(Severe Pneumonia,SP)患者血气指标、肺功能的影响。方法:回顾性分析2019年2月至2022年9月于本院就诊...目的:探讨盐酸氨溴索支气管肺泡灌洗联合机械通气治疗对慢性阻塞性肺疾病(Chronic Obstructive Pulmonary Disease,COPD)合并重症肺炎(Severe Pneumonia,SP)患者血气指标、肺功能的影响。方法:回顾性分析2019年2月至2022年9月于本院就诊的103例COPD-SP患者的临床资料。按照不同治疗方式将患者分为对照组(机械通气治疗,n=50)和观察组(盐酸氨溴索支气管肺泡灌洗联合机械通气治疗,n=53)。观察两组血气分析指标、肺功能、临床疗效和并发症。结果:与治疗前相比,各治疗组的动脉血氧分压(Arterial partial pressure of oxygen,PaO_(2))、动脉氧饱和度(Arterial oxygen saturation,SaO_(2))水平均明显升高,乳酸(Lactic Acid,Lac)水平明显降低(P<0.05),其中观察组更为显著(P<0.05)。与治疗前相比,各治疗组的第1秒用力呼气容积(Force the expiratory volume for the first second,FEV1)、用力肺活量(Forced Vital Capacity,FVC)、FEV1/FVC值均明显增加(P<0.05),其中观察组更为显著(P<0.05)。观察组临床总疗效明显高于对照组(P<0.05)。观察组并发症总发生率明显低于对照组(P<0.05)。结论:针对COPD-SP实行盐酸氨溴索支气管肺泡灌洗联合机械通气治疗有较满意的治疗效果,能有效改善患者肺功能,减少并发症的发生。展开更多
基金supported financially by the National Natural Science Foundation(No.41174117)the Major National Science and Technology Projects(No.2011ZX05031–001)
文摘The frequency–space（f–x） empirical mode decomposition（EMD） denoising method has two limitations when applied to nonstationary seismic data. First, subtracting the first intrinsic mode function（IMF） results in signal damage and limited denoising. Second, decomposing the real and imaginary parts of complex data may lead to inconsistent decomposition numbers. Thus, we propose a new method named f–x spatial projection-based complex empirical mode decomposition（CEMD） prediction filtering. The proposed approach directly decomposes complex seismic data into a series of complex IMFs（CIMFs） using the spatial projection-based CEMD algorithm and then applies f–x predictive filtering to the stationary CIMFs to improve the signal-to-noise ratio. Synthetic and real data examples were used to demonstrate the performance of the new method in random noise attenuation and seismic signal preservation.
文摘目的:探讨盐酸氨溴索支气管肺泡灌洗联合机械通气治疗对慢性阻塞性肺疾病(Chronic Obstructive Pulmonary Disease,COPD)合并重症肺炎(Severe Pneumonia,SP)患者血气指标、肺功能的影响。方法:回顾性分析2019年2月至2022年9月于本院就诊的103例COPD-SP患者的临床资料。按照不同治疗方式将患者分为对照组(机械通气治疗,n=50)和观察组(盐酸氨溴索支气管肺泡灌洗联合机械通气治疗,n=53)。观察两组血气分析指标、肺功能、临床疗效和并发症。结果:与治疗前相比,各治疗组的动脉血氧分压(Arterial partial pressure of oxygen,PaO_(2))、动脉氧饱和度(Arterial oxygen saturation,SaO_(2))水平均明显升高,乳酸(Lactic Acid,Lac)水平明显降低(P<0.05),其中观察组更为显著(P<0.05)。与治疗前相比,各治疗组的第1秒用力呼气容积(Force the expiratory volume for the first second,FEV1)、用力肺活量(Forced Vital Capacity,FVC)、FEV1/FVC值均明显增加(P<0.05),其中观察组更为显著(P<0.05)。观察组临床总疗效明显高于对照组(P<0.05)。观察组并发症总发生率明显低于对照组(P<0.05)。结论:针对COPD-SP实行盐酸氨溴索支气管肺泡灌洗联合机械通气治疗有较满意的治疗效果,能有效改善患者肺功能,减少并发症的发生。
