目的搔抓动作表现为手腕的加速度变化,采用加速度记录仪以手表形式佩戴于利侧手腕客观定量化评价特应性皮炎(atopic dermatitis,AD)瘙痒程度。方法健康志愿者与AD患者连续佩戴加速度记录仪记录手腕的加速度变化,设定ZCM模式第13型Mini-M...目的搔抓动作表现为手腕的加速度变化,采用加速度记录仪以手表形式佩戴于利侧手腕客观定量化评价特应性皮炎(atopic dermatitis,AD)瘙痒程度。方法健康志愿者与AD患者连续佩戴加速度记录仪记录手腕的加速度变化,设定ZCM模式第13型Mini-Motionlogger作为分析参数。为排除非瘙痒引起的干扰,采用夜间睡眠期的变量作为分析对象。评价治疗前后湿疹面积及严重度指数评分(eczema area and severity index,EASI)、视觉模拟评分(visual analogue scale,VAS)值变化,观察平均活动量(night activity,NA)和瘙痒时间占总睡眠时间百分比(the percent of itching time,PIT)的变化。并评价三者与皮损EASI评分间的相关性。结果 AD患者夜间睡眠时活动量较健康受试者更为频密。AD患者治疗前后NA的前后差值(△)与EASI评分的前后差值(△)相关性较低(P>0.05,r=0.42);VAS评分的前后差值与EASI评分的前后差值几乎没有线性关系(P>0.05,r=0.34);而PIT的前后差值与EASI评分的前后差值则呈直线相关(P<0.05,r=0.75)。结论本研究以健康人的夜间活动量作为基础阈值,计算PIT值,将非瘙痒引起的因素尽可能降低,取得了较好的效果。以PIT值作为分析指标,可取得AD患者夜间搔抓行为相对准确的定量。PIT值与EASI有较高的相关性。展开更多
Records of the May 12, 2008 Ms8.0 Wenchuan, Sichuan, earthquake from 27 stations of Shaanxi Digital Strong Motion Network are processed and analyzed, including baseline adjustment of acceleration traces, filtering, an...Records of the May 12, 2008 Ms8.0 Wenchuan, Sichuan, earthquake from 27 stations of Shaanxi Digital Strong Motion Network are processed and analyzed, including baseline adjustment of acceleration traces, filtering, and calculations of velocities, displacements and acceleration response spectra. The results show that direction energy radiation of the large earthquake and horizontal inhomogeneous medium along the wave traveling path might both have some effect on the scattering degree of the attenuation of PGAH, besides influence of local site conditions. For the same intensity, the ratios of PGA/PGV are commonly small, on average about 5, which indicates that long period components are rich in ground motion. Intensities for most sites of the stations are within V -VII. The larger one among PGAE-W and PGAN-S is quite close to their PGAH, which is less than 10 % in relative deviation. The dominated waves are surface waves. The thicker the soil overburden is, the stronger the surface wave will be and the longer the shaking will last. Local site conditions have strong effects on ground motion, especially those of thick sediment filled-in basins, as they can significantly amplify long-period components.展开更多
This paper uses Jin Xing( 2004,2005) and Ma Qiang's( 2003) real-time time-domain methods to simulate and compare both the broadband strong motion acceleration and velocity records measured at the same stations in ...This paper uses Jin Xing( 2004,2005) and Ma Qiang's( 2003) real-time time-domain methods to simulate and compare both the broadband strong motion acceleration and velocity records measured at the same stations in the Liaoning Telemetered Digital Seismic Network. The results show that we can get actual velocity and displacement time histories by simulating broadband acceleration records. The acceleration and displacement time histories also may be obtained by simulating broadband velocity records. This indicates that strong motion observations and seismometer observations can be substituted for each other in a certain range.展开更多
文摘目的搔抓动作表现为手腕的加速度变化,采用加速度记录仪以手表形式佩戴于利侧手腕客观定量化评价特应性皮炎(atopic dermatitis,AD)瘙痒程度。方法健康志愿者与AD患者连续佩戴加速度记录仪记录手腕的加速度变化,设定ZCM模式第13型Mini-Motionlogger作为分析参数。为排除非瘙痒引起的干扰,采用夜间睡眠期的变量作为分析对象。评价治疗前后湿疹面积及严重度指数评分(eczema area and severity index,EASI)、视觉模拟评分(visual analogue scale,VAS)值变化,观察平均活动量(night activity,NA)和瘙痒时间占总睡眠时间百分比(the percent of itching time,PIT)的变化。并评价三者与皮损EASI评分间的相关性。结果 AD患者夜间睡眠时活动量较健康受试者更为频密。AD患者治疗前后NA的前后差值(△)与EASI评分的前后差值(△)相关性较低(P>0.05,r=0.42);VAS评分的前后差值与EASI评分的前后差值几乎没有线性关系(P>0.05,r=0.34);而PIT的前后差值与EASI评分的前后差值则呈直线相关(P<0.05,r=0.75)。结论本研究以健康人的夜间活动量作为基础阈值,计算PIT值,将非瘙痒引起的因素尽可能降低,取得了较好的效果。以PIT值作为分析指标,可取得AD患者夜间搔抓行为相对准确的定量。PIT值与EASI有较高的相关性。
文摘Records of the May 12, 2008 Ms8.0 Wenchuan, Sichuan, earthquake from 27 stations of Shaanxi Digital Strong Motion Network are processed and analyzed, including baseline adjustment of acceleration traces, filtering, and calculations of velocities, displacements and acceleration response spectra. The results show that direction energy radiation of the large earthquake and horizontal inhomogeneous medium along the wave traveling path might both have some effect on the scattering degree of the attenuation of PGAH, besides influence of local site conditions. For the same intensity, the ratios of PGA/PGV are commonly small, on average about 5, which indicates that long period components are rich in ground motion. Intensities for most sites of the stations are within V -VII. The larger one among PGAE-W and PGAN-S is quite close to their PGAH, which is less than 10 % in relative deviation. The dominated waves are surface waves. The thicker the soil overburden is, the stronger the surface wave will be and the longer the shaking will last. Local site conditions have strong effects on ground motion, especially those of thick sediment filled-in basins, as they can significantly amplify long-period components.
基金funded by the postgraduate fund of Earthquake Administration of Liaoning Province,China(LNDZBSJJ002)
文摘This paper uses Jin Xing( 2004,2005) and Ma Qiang's( 2003) real-time time-domain methods to simulate and compare both the broadband strong motion acceleration and velocity records measured at the same stations in the Liaoning Telemetered Digital Seismic Network. The results show that we can get actual velocity and displacement time histories by simulating broadband acceleration records. The acceleration and displacement time histories also may be obtained by simulating broadband velocity records. This indicates that strong motion observations and seismometer observations can be substituted for each other in a certain range.
