Using the air plasma ignition technique, physicochemical process of burning can be accelerated; concentration limit ofretrofires both can be extended; reliability of retrofires and stability of burning can be improved...Using the air plasma ignition technique, physicochemical process of burning can be accelerated; concentration limit ofretrofires both can be extended; reliability of retrofires and stability of burning can be improved. In this paper, using internalequivalent heat area in place of electric are that created Ohm heat, the flow fields of thermodynamic equilibrium chemistry con-gealment and chemistry non-equilibrium in the plasma generator were simulated. The influences of the inlet prerotation angleof air, the inlet total pressure of air and the airflow compression angle of spray nozzle on the temperature on the surface of elec-展开更多
An inversion method was applied to crustal earthquakes dataset to find S-wave attenuation characteristics beneath the Eastern Tohoku region of Japan. Accelerograms from 85 shallow crustal earthquakes up to 25 km depth...An inversion method was applied to crustal earthquakes dataset to find S-wave attenuation characteristics beneath the Eastern Tohoku region of Japan. Accelerograms from 85 shallow crustal earthquakes up to 25 km depth and magnitude range between 3.5 and 5.5 were analyzed to estimate the seismic quality factor Qs. A homogeneous attenuation model Qs for the wave propagation path was evaluated from spectral amplitudes, at 24 different frequencies between 0.5 and 20 Hz by using generalized inversion technique. To do this, non-parametric attenuation functions were calculated to observe spectral amplitude decay with hypocentral distance. Then, these functions were parameterized to estimate Qs. It was found that in Eastern Tohoku region, the Qs frequency dependence can be approximated with the function 33 f 1.22 within a frequency range between 0.5 and 20 Hz. However, the frequency dependence of Qs in the frequency range between 0.5 and 6 Hz is best approximated by Qs （f） = 36 f 0.94 showing relatively weaker frequency dependence as compared to the relation Qs （f） = 6 f^ 2.09 for the frequency range between 6 and 15 Hz. These results could be used to estimate source and site parameters for seismic hazard assessment in the region.展开更多
目的评价与分析Coflex椎板间动态稳定系统术后并发症的发生率及原因,分析并发症发生的危险因素。方法回顾性分析2007~2015年于我院接受单节段减压后Coflex椎板间动态稳定装置植入患者,收集相关人口统计资料、临床相关资料及影像学资料...目的评价与分析Coflex椎板间动态稳定系统术后并发症的发生率及原因,分析并发症发生的危险因素。方法回顾性分析2007~2015年于我院接受单节段减压后Coflex椎板间动态稳定装置植入患者,收集相关人口统计资料、临床相关资料及影像学资料。记录并发症发生情况,总结各类并发症的发生率、发生原因及再手术情况。运用单因素与多因素Logisitic回归分析对所有纳入患者的各类临床与影像学参数的进行性统计学分析,确定并发症发生的独立危险因素。结果研究共纳入164例,其中男72例,女92例,平均年龄(57.70±12.29)岁,平均随访时间(31.11±20.44)个月。患者入院诊断腰椎管狭窄症90例(54.9%),腰椎间盘突出症68例(41.5%),腰椎滑脱6例(3.7%)。手术节段包括L4~5节段148例(90.2%),L3~4节段5例(3%),L2~3节段1例(0.6%),L5~S1节段10例(6.1%)。术中平均手术时间(124.02±24.12)min,平均出血量(178.48±111.85)ml。26例(15.9%,26/164)发生28例次并发症,并发症原因包括2例次(7.1%)手术一般并发症,6例次(14.3%)内固定直接并发症,19例次(67.9%)内固定间接并发症,1例次(3.6%)其它并发症。最终10例(6.1%,10/164)接受再手术。手术时间,体质量指数(body mass index,BMI),Coflex节段终板Modic改变,Coflex节段间盘压迫椎管占比均为并发症发生的独立危险因素。结论 Coflex椎板间动态稳定系统的术后并发症发生率为15.9%,再手术率为6.1%,安全性良好。主要并发症原因为原手术节段与邻近节段退变。并发症发生的独立危险因素包括手术时间、BMI、手术节段椎间盘压迫椎管占比、手术节段终板Modic改变。展开更多
文摘Using the air plasma ignition technique, physicochemical process of burning can be accelerated; concentration limit ofretrofires both can be extended; reliability of retrofires and stability of burning can be improved. In this paper, using internalequivalent heat area in place of electric are that created Ohm heat, the flow fields of thermodynamic equilibrium chemistry con-gealment and chemistry non-equilibrium in the plasma generator were simulated. The influences of the inlet prerotation angleof air, the inlet total pressure of air and the airflow compression angle of spray nozzle on the temperature on the surface of elec-
基金a part of author’s M.Sc Research under the project:‘‘Strengthening of Earthquake Engineering Center’’,funded by Higher Education Commission,Government of Pakistan
文摘An inversion method was applied to crustal earthquakes dataset to find S-wave attenuation characteristics beneath the Eastern Tohoku region of Japan. Accelerograms from 85 shallow crustal earthquakes up to 25 km depth and magnitude range between 3.5 and 5.5 were analyzed to estimate the seismic quality factor Qs. A homogeneous attenuation model Qs for the wave propagation path was evaluated from spectral amplitudes, at 24 different frequencies between 0.5 and 20 Hz by using generalized inversion technique. To do this, non-parametric attenuation functions were calculated to observe spectral amplitude decay with hypocentral distance. Then, these functions were parameterized to estimate Qs. It was found that in Eastern Tohoku region, the Qs frequency dependence can be approximated with the function 33 f 1.22 within a frequency range between 0.5 and 20 Hz. However, the frequency dependence of Qs in the frequency range between 0.5 and 6 Hz is best approximated by Qs （f） = 36 f 0.94 showing relatively weaker frequency dependence as compared to the relation Qs （f） = 6 f^ 2.09 for the frequency range between 6 and 15 Hz. These results could be used to estimate source and site parameters for seismic hazard assessment in the region.
文摘目的评价与分析Coflex椎板间动态稳定系统术后并发症的发生率及原因,分析并发症发生的危险因素。方法回顾性分析2007~2015年于我院接受单节段减压后Coflex椎板间动态稳定装置植入患者,收集相关人口统计资料、临床相关资料及影像学资料。记录并发症发生情况,总结各类并发症的发生率、发生原因及再手术情况。运用单因素与多因素Logisitic回归分析对所有纳入患者的各类临床与影像学参数的进行性统计学分析,确定并发症发生的独立危险因素。结果研究共纳入164例,其中男72例,女92例,平均年龄(57.70±12.29)岁,平均随访时间(31.11±20.44)个月。患者入院诊断腰椎管狭窄症90例(54.9%),腰椎间盘突出症68例(41.5%),腰椎滑脱6例(3.7%)。手术节段包括L4~5节段148例(90.2%),L3~4节段5例(3%),L2~3节段1例(0.6%),L5~S1节段10例(6.1%)。术中平均手术时间(124.02±24.12)min,平均出血量(178.48±111.85)ml。26例(15.9%,26/164)发生28例次并发症,并发症原因包括2例次(7.1%)手术一般并发症,6例次(14.3%)内固定直接并发症,19例次(67.9%)内固定间接并发症,1例次(3.6%)其它并发症。最终10例(6.1%,10/164)接受再手术。手术时间,体质量指数(body mass index,BMI),Coflex节段终板Modic改变,Coflex节段间盘压迫椎管占比均为并发症发生的独立危险因素。结论 Coflex椎板间动态稳定系统的术后并发症发生率为15.9%,再手术率为6.1%,安全性良好。主要并发症原因为原手术节段与邻近节段退变。并发症发生的独立危险因素包括手术时间、BMI、手术节段椎间盘压迫椎管占比、手术节段终板Modic改变。
