By computing and classifying the data of gully offset obtained from field surveys along the Tianjingshan fault zone and estimating the ages of three types of gullies,the strike-slip rates along the fault zone are disc...By computing and classifying the data of gully offset obtained from field surveys along the Tianjingshan fault zone and estimating the ages of three types of gullies,the strike-slip rates along the fault zone are discussed in different time intervals and fault segments.The results suggest that the intensity of activity along the fault zone is not strong,but the differences between different time intervals and fault segments since the late Pleistocene have been obvious.The average rates range from 0.23 mm/a to 1.62 mm/a.The largest average rate is 1.40 mm/a,which occurred in the early and middle of late Pleistocene along the western segment of the fault zone.Since the late stage of the late Pleistocene,the center of faulting activity of the fault zone has shifted to the middle segment,and the average slip rates range have changed from 1.30 mm/a to 1.63 mm/a.展开更多
Let,. We study the existence and multiple positive solutions of n-th nonlinear discrete fractional boundary value problem of the form By using a fixed-point theorem on cone, the parameter intervals of problem is estab...Let,. We study the existence and multiple positive solutions of n-th nonlinear discrete fractional boundary value problem of the form By using a fixed-point theorem on cone, the parameter intervals of problem is established.展开更多
A square-root version of the divided difference Rauch-Tung-Striebel (RTS) smoother is proposed in this paper. The square-root variant essentially propagates the square roots of the covariance matrices and can consiste...A square-root version of the divided difference Rauch-Tung-Striebel (RTS) smoother is proposed in this paper. The square-root variant essentially propagates the square roots of the covariance matrices and can consistently improve the numerical stability because all the resulting covariance matrices are guaranteed to stay positive semi-definite. Furthermore, the square-root form ensures reliable implementation in an embedded system with fixed or limited precision although it is algebraically equivalent to the standard form. The new smoothing algorithm is tested in a challenging two-dimensional maneuvering target tracking problem with unknown and time-varying turn rate, and its performance is compared with that of other de-facto standard filters and smoothers. The simulation results indicate that the proposed RTS smoother markedly outperforms the associated filters and gives slightly smaller error than an unscented-based RTS smoother.展开更多
With the improved knowledge on clinical relevance and more convenient access to the patientreported outcome data,clinical researchers prefer to adopt minimal clinically important difference(MCID)rather than statistica...With the improved knowledge on clinical relevance and more convenient access to the patientreported outcome data,clinical researchers prefer to adopt minimal clinically important difference(MCID)rather than statistical significance as a testing standard to examine the effectiveness of certain intervention or treatment in clinical trials.A practical method to determining the MCID is based on the diagnostic measurement.By using this approach,the MCID can be formulated as the solution of a large margin classification problem.However,this method only produces the point estimation,hence lacks ways to evaluate its performance.In this paper,we introduce an m-out-of-n bootstrap approach which provides the interval estimations for MCID and its classification error,an associated accuracy measure for performance assessment.A variety of extensive simulation studies are implemented to show the advantages of our proposed method.Analysis of the chondral lesions and meniscus procedures(ChAMP)trial is our motivating example and is used to illustrate our method.展开更多
目的探讨局灶性癫痫围发作期心率变异性变化特点。方法收集2014年9月至2019年9月在首都医科大学附属北京天坛医院癫痫中心进行术前评估并完成手术的癫痫患者102例,选择局灶性发作198次,手动测量相邻两个心电活动的RR间期,计算心率变异...目的探讨局灶性癫痫围发作期心率变异性变化特点。方法收集2014年9月至2019年9月在首都医科大学附属北京天坛医院癫痫中心进行术前评估并完成手术的癫痫患者102例,选择局灶性发作198次,手动测量相邻两个心电活动的RR间期,计算心率变异性时域参数-相邻正常心跳间期差值平方和的均方根(RMSSD),比较发作前60 s、发作期、终止后60 s RMSSD差异,并比较不同心率变化类型、不同发作类型、不同发作前状态以及不同致痫灶部位和侧别RMSSD差异。结果发作期和发作前60 s及终止后60 s RMSSD相比差异有统计学意义(P<0.001),提示发作期RMSSD降低;心率增快类型癫痫发作期RMSSD降低(P<0.001);复杂部分性癫痫发作期RMSSD降低(P<0.001);颞叶内侧癫痫发作期RMSSD降低(右颞叶内侧P<0.001;左颞叶内侧P<0.001);心率无变化(P=0.556)和心率减慢(P=0.983)类型癫痫发作、单纯部分性癫痫(P=0.869)、颞叶外侧癫痫(右颞叶外侧P=0.204;左颞叶外侧P=0.849)和颞叶外癫痫(右颞外P=0.188;左颞外P=0.068)发作期RMSSD无降低。发作期和发作前60 s RMSSD差值在睡眠期更明显(P=0.039)。结论心率增快类型癫痫发作、复杂部分性癫痫、颞叶内侧癫痫发作期易发生心率变异性下降,提示癫痫发作期副交感活性下降;睡眠期状态下发生的癫痫发作期心率变异性下降相比清醒期显著,提示睡眠期癫痫发作副交感活性下降更加明显。展开更多
Mapping soil organic matter(SOM)content has become an important application of digital soil mapping.In this study,we processed all Sentinel-2 images covering the bare-soil period(March to June)in Northeast China from ...Mapping soil organic matter(SOM)content has become an important application of digital soil mapping.In this study,we processed all Sentinel-2 images covering the bare-soil period(March to June)in Northeast China from 2019 to 2022 and integrated the observation results into synthetic materials with four defined time intervals(10,15,20,and 30 d).Then,we used synthetic images corresponding to different time periods to conduct SOM mapping and determine the optimal time interval and time period beforefinally assessing the impacts of adding environmental covariates.The results showed the following:(1)in SOM mapping,the highest accuracy was obtained using day-of-year(DOY)120 to 140 synthetic images with 20 d time intervals,as well as with different time intervals,ranked as follows:20 d>30 d>15 d>10 d;(2)when using synthetic images at different time intervals to predict SOM,the best time period for predicting SOM was always within May;and(3)adding environmental covariates effectively improved the SOM mapping performance,and the multiyear average temperature was the most important factor.In general,our results demonstrated the valuable potential of SOM mapping using multiyear synthetic imagery,thereby allowing detailed mapping of large areas of cultivated soil.展开更多
基金This project was sponsored by the State Seismological Bureau (85-02-3-3), China
文摘By computing and classifying the data of gully offset obtained from field surveys along the Tianjingshan fault zone and estimating the ages of three types of gullies,the strike-slip rates along the fault zone are discussed in different time intervals and fault segments.The results suggest that the intensity of activity along the fault zone is not strong,but the differences between different time intervals and fault segments since the late Pleistocene have been obvious.The average rates range from 0.23 mm/a to 1.62 mm/a.The largest average rate is 1.40 mm/a,which occurred in the early and middle of late Pleistocene along the western segment of the fault zone.Since the late stage of the late Pleistocene,the center of faulting activity of the fault zone has shifted to the middle segment,and the average slip rates range have changed from 1.30 mm/a to 1.63 mm/a.
文摘Let,. We study the existence and multiple positive solutions of n-th nonlinear discrete fractional boundary value problem of the form By using a fixed-point theorem on cone, the parameter intervals of problem is established.
基金the Fundamental Research Fund of Northwestern Polytechnical University( Grant No. JC20120210,JC20110238)
文摘A square-root version of the divided difference Rauch-Tung-Striebel (RTS) smoother is proposed in this paper. The square-root variant essentially propagates the square roots of the covariance matrices and can consistently improve the numerical stability because all the resulting covariance matrices are guaranteed to stay positive semi-definite. Furthermore, the square-root form ensures reliable implementation in an embedded system with fixed or limited precision although it is algebraically equivalent to the standard form. The new smoothing algorithm is tested in a challenging two-dimensional maneuvering target tracking problem with unknown and time-varying turn rate, and its performance is compared with that of other de-facto standard filters and smoothers. The simulation results indicate that the proposed RTS smoother markedly outperforms the associated filters and gives slightly smaller error than an unscented-based RTS smoother.
基金supported by the National Center for Advancing Translational Sciences of the National Institutes of Health under award number UL1TR001412.
文摘With the improved knowledge on clinical relevance and more convenient access to the patientreported outcome data,clinical researchers prefer to adopt minimal clinically important difference(MCID)rather than statistical significance as a testing standard to examine the effectiveness of certain intervention or treatment in clinical trials.A practical method to determining the MCID is based on the diagnostic measurement.By using this approach,the MCID can be formulated as the solution of a large margin classification problem.However,this method only produces the point estimation,hence lacks ways to evaluate its performance.In this paper,we introduce an m-out-of-n bootstrap approach which provides the interval estimations for MCID and its classification error,an associated accuracy measure for performance assessment.A variety of extensive simulation studies are implemented to show the advantages of our proposed method.Analysis of the chondral lesions and meniscus procedures(ChAMP)trial is our motivating example and is used to illustrate our method.
文摘目的探讨局灶性癫痫围发作期心率变异性变化特点。方法收集2014年9月至2019年9月在首都医科大学附属北京天坛医院癫痫中心进行术前评估并完成手术的癫痫患者102例,选择局灶性发作198次,手动测量相邻两个心电活动的RR间期,计算心率变异性时域参数-相邻正常心跳间期差值平方和的均方根(RMSSD),比较发作前60 s、发作期、终止后60 s RMSSD差异,并比较不同心率变化类型、不同发作类型、不同发作前状态以及不同致痫灶部位和侧别RMSSD差异。结果发作期和发作前60 s及终止后60 s RMSSD相比差异有统计学意义(P<0.001),提示发作期RMSSD降低;心率增快类型癫痫发作期RMSSD降低(P<0.001);复杂部分性癫痫发作期RMSSD降低(P<0.001);颞叶内侧癫痫发作期RMSSD降低(右颞叶内侧P<0.001;左颞叶内侧P<0.001);心率无变化(P=0.556)和心率减慢(P=0.983)类型癫痫发作、单纯部分性癫痫(P=0.869)、颞叶外侧癫痫(右颞叶外侧P=0.204;左颞叶外侧P=0.849)和颞叶外癫痫(右颞外P=0.188;左颞外P=0.068)发作期RMSSD无降低。发作期和发作前60 s RMSSD差值在睡眠期更明显(P=0.039)。结论心率增快类型癫痫发作、复杂部分性癫痫、颞叶内侧癫痫发作期易发生心率变异性下降,提示癫痫发作期副交感活性下降;睡眠期状态下发生的癫痫发作期心率变异性下降相比清醒期显著,提示睡眠期癫痫发作副交感活性下降更加明显。
基金supported by the Strategic Priority Research Program of the Chinese Academy of Sciences(XDA28100000)the K.C.Wong Education Foundation,Jilin Provincial Development and Reform Commission Innovation Capacity Building Project(grant number 2021C044-10)the Special fund project for high-tech indus-trialization of science and technology cooperation between Jilin Province and the Chinese Academy of Sciences(2021SYHZ0013).
文摘Mapping soil organic matter(SOM)content has become an important application of digital soil mapping.In this study,we processed all Sentinel-2 images covering the bare-soil period(March to June)in Northeast China from 2019 to 2022 and integrated the observation results into synthetic materials with four defined time intervals(10,15,20,and 30 d).Then,we used synthetic images corresponding to different time periods to conduct SOM mapping and determine the optimal time interval and time period beforefinally assessing the impacts of adding environmental covariates.The results showed the following:(1)in SOM mapping,the highest accuracy was obtained using day-of-year(DOY)120 to 140 synthetic images with 20 d time intervals,as well as with different time intervals,ranked as follows:20 d>30 d>15 d>10 d;(2)when using synthetic images at different time intervals to predict SOM,the best time period for predicting SOM was always within May;and(3)adding environmental covariates effectively improved the SOM mapping performance,and the multiyear average temperature was the most important factor.In general,our results demonstrated the valuable potential of SOM mapping using multiyear synthetic imagery,thereby allowing detailed mapping of large areas of cultivated soil.
