In this paper, we present a new method to determine the relative permittivity of periodic stratified media using the iterative time-reversal method. Based on transmission line theory, the focal peak value of iterative...In this paper, we present a new method to determine the relative permittivity of periodic stratified media using the iterative time-reversal method. Based on transmission line theory, the focal peak value of iterative time-reversal electro- magnetic waves, which contain information about the periodic stratified medium, is computed in pulse-echo mode. Using the relationship between the focal peak value and the relative permittivity of the periodic stratified medium, the relative permittivity can be obtained by measuring the focal peak value. Numerical simulations are conducted, and the results demonstrate the feasibility of the proposed approach to the measurement of the relative permittivity of a periodic stratified medium.展开更多
Let X t be the interaction measured_valued branching α_ symmetric stable process over R d(1<α≤2) constructed by Meleard_Roelly . Frist, it is shown that X t is absolutely continuous with respect to the Lebesgue ...Let X t be the interaction measured_valued branching α_ symmetric stable process over R d(1<α≤2) constructed by Meleard_Roelly . Frist, it is shown that X t is absolutely continuous with respect to the Lebesgue measure (on R ) with a continuous density function which satisfies some SPDE. Second, it is proved that if the underlying process is a Brownian motion on R d (d≤3), the corresponding occupation_time process Y t is also absolutely continuous with respect to the Lebesgue measure.展开更多
目的 探讨资源为基础的相对价值比率(Resource based relative value scale, RBRVS)和疾病诊断相关分组(Diagnosis related group, DRGs)相结合的绩效管理方案在公立医院临床活动中的应用价值。方法 选取我院内分泌科及骨科患者为研究对...目的 探讨资源为基础的相对价值比率(Resource based relative value scale, RBRVS)和疾病诊断相关分组(Diagnosis related group, DRGs)相结合的绩效管理方案在公立医院临床活动中的应用价值。方法 选取我院内分泌科及骨科患者为研究对象,2022年1月至3月两科室绩效分配采用RBRVS为基础的绩效方案,2023年1月至3月采用RBRVS与DRGs相结合的绩效方案,获得并比较两科室不同年份同月份实施两种不同绩效方案的床位周转率、住院时间、平均费用、死亡率和主观满意度。结果 与RBRVS为基础的绩效方案相比,实施RBRVS与DRGs相结合的绩效方案后,两科室床位周转率、住院时间、平均费用、病死率均显著降低(P<0.05),主观满意度提高(P<0.05)。结论 RBRVS与DRGs相结合的绩效方案有利于减少临床住院时间、费用和病死率,提高床位利用率和主观满意度,值得临床推广。展开更多
滑动轴承的声发射(Acoustic Emission,AE)信号噪声污染严重,限制了K均值奇异值分解(K-means Singular Value Decomposition,K-SVD)字典算法的降噪能力。基于此,结合AE信号特点,提出了基于多层多位置稀疏的滑动轴承AE信号降噪算法。首先...滑动轴承的声发射(Acoustic Emission,AE)信号噪声污染严重,限制了K均值奇异值分解(K-means Singular Value Decomposition,K-SVD)字典算法的降噪能力。基于此,结合AE信号特点,提出了基于多层多位置稀疏的滑动轴承AE信号降噪算法。首先提出移动标尺策略重构AE信号,使信号获得多层多位置的稀疏特性,解决了K-SVD容易忽略原子间隐藏信息的问题,然后通过灰色B型绝对关联度降低字典原子冗余度,提高字典运算速度。因此,与传统的K-SVD算法相比,该算法具有更好的降噪性能。应用到实例中,该算法成功获得了滑动轴承不同程度摩擦状态的变化,证明了该算法的有效性。展开更多
基金Project supported by the National Natural Science Foundation of China(Grant Nos.61071031,61107018,and 61201089)the Research Fund for the Doctoral Program of Higher Education of China(Grant Nos.20100185110021 and 20120185130001)+2 种基金the Program for Changjiang Scholars and Innovation Team in University,China(Grant No.IRT1113)the Natural Science Foundation of the Higher Education Institutions of Anhui Province(Grant No.KJ2013Z287)Fundamental Research Fund for the Central Universities(Grant No.ZYGX2011YB018)
文摘In this paper, we present a new method to determine the relative permittivity of periodic stratified media using the iterative time-reversal method. Based on transmission line theory, the focal peak value of iterative time-reversal electro- magnetic waves, which contain information about the periodic stratified medium, is computed in pulse-echo mode. Using the relationship between the focal peak value and the relative permittivity of the periodic stratified medium, the relative permittivity can be obtained by measuring the focal peak value. Numerical simulations are conducted, and the results demonstrate the feasibility of the proposed approach to the measurement of the relative permittivity of a periodic stratified medium.
文摘Let X t be the interaction measured_valued branching α_ symmetric stable process over R d(1<α≤2) constructed by Meleard_Roelly . Frist, it is shown that X t is absolutely continuous with respect to the Lebesgue measure (on R ) with a continuous density function which satisfies some SPDE. Second, it is proved that if the underlying process is a Brownian motion on R d (d≤3), the corresponding occupation_time process Y t is also absolutely continuous with respect to the Lebesgue measure.
文摘目的 探讨资源为基础的相对价值比率(Resource based relative value scale, RBRVS)和疾病诊断相关分组(Diagnosis related group, DRGs)相结合的绩效管理方案在公立医院临床活动中的应用价值。方法 选取我院内分泌科及骨科患者为研究对象,2022年1月至3月两科室绩效分配采用RBRVS为基础的绩效方案,2023年1月至3月采用RBRVS与DRGs相结合的绩效方案,获得并比较两科室不同年份同月份实施两种不同绩效方案的床位周转率、住院时间、平均费用、死亡率和主观满意度。结果 与RBRVS为基础的绩效方案相比,实施RBRVS与DRGs相结合的绩效方案后,两科室床位周转率、住院时间、平均费用、病死率均显著降低(P<0.05),主观满意度提高(P<0.05)。结论 RBRVS与DRGs相结合的绩效方案有利于减少临床住院时间、费用和病死率,提高床位利用率和主观满意度,值得临床推广。
文摘滑动轴承的声发射(Acoustic Emission,AE)信号噪声污染严重,限制了K均值奇异值分解(K-means Singular Value Decomposition,K-SVD)字典算法的降噪能力。基于此,结合AE信号特点,提出了基于多层多位置稀疏的滑动轴承AE信号降噪算法。首先提出移动标尺策略重构AE信号,使信号获得多层多位置的稀疏特性,解决了K-SVD容易忽略原子间隐藏信息的问题,然后通过灰色B型绝对关联度降低字典原子冗余度,提高字典运算速度。因此,与传统的K-SVD算法相比,该算法具有更好的降噪性能。应用到实例中,该算法成功获得了滑动轴承不同程度摩擦状态的变化,证明了该算法的有效性。
