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View article: 基于多尺度特征融合的φ-OTDR系统相似信号识别方法
基于多尺度特征融合的φ-OTDR系统相似信号识别方法 Open
为解决分布式相位敏感光时域反射计系统现有事件识别方法对于相似振动信号识别困难这一问题,提出了一种基于多尺度特征融合的相似信号识别方法。在该方法中,原始信号首先通过经验模态分解和小波包分解被分解为不同频率范围内的子信号。随后,分别提取原始信号和子信号的时频特征和近似熵特征,并利用主成分分析法对所提取的特征进行融合。最后,通过构建一个6层轻量反向传播(BP)神经网络分类器,训练分类模型并利用测试集验证模型分类度。该方法对小车经过和行走等相似信号的识别准确率可分别达到98.5%和…
View article: 基于双芯光子晶体光纤的耦合器设计方法
基于双芯光子晶体光纤的耦合器设计方法 Open
采用光束传播法对双芯光子晶体光纤中光纤结构参数对纤芯间耦合效率的影响进行分析。首先,根据双芯耦合原理,使用最小二乘法对波导间的耦合系数等参数进行估计,明确孔间距、纤芯折射率差、中央空气孔直径比例、纤芯直径比例、空气孔直径比例和空气孔对称度等参数对双芯光子晶体光纤耦合比及耦合区长度的调节作用,提出一种基于双芯光子晶体光纤的耦合器性能粗调与微调设计方法。然后,根据这一耦合器设计方法,提出一种非对称的双芯光子晶体光纤宽带定向耦合器。该耦合器在1.31~1.55 μm区间实现了50…
View article: Higher visceral adiposity index was associated with an elevated prevalence of gallstones and an earlier age at first gallstone surgery in US adults: the results are based on a cross-sectional study
Higher visceral adiposity index was associated with an elevated prevalence of gallstones and an earlier age at first gallstone surgery in US adults: the results are based on a cross-sectional study Open
Objective We sought to evaluate the association between visceral adiposity index (VAI) and the incidence of gallstones and the age at first gallstone surgery in adults in the United States. Methods We selected individuals from the National…
View article: On-line status monitoring and surrounding environment perception of an underwater cable based on the phase-locked Φ-OTDR sensing system
On-line status monitoring and surrounding environment perception of an underwater cable based on the phase-locked Φ-OTDR sensing system Open
A newly designed phase-locked (PL) Φ-OTDR system was proposed and instrumented. Field tests of water impact, anchor damage towing and tide diagnosing were carried out in a natural freshwater lake as well as the East China Sea. Personnel mo…
View article: A Space-Division Multiplexing Method for Fading Noise Suppression in the Φ-OTDR System
A Space-Division Multiplexing Method for Fading Noise Suppression in the Φ-OTDR System Open
Phase-sensitive time-domain reflectometry (Φ-OTDR) can be used for fully distributed long-distance vibration monitoring. There is a fading phenolmenon in the Φ-OTDR, which will cause the signal intensity somewhere to be too low to extract …
View article: A visibility enhanced broadband phase-sensitive OTDR based on the UWFBG array and frequency-division-multiplexing
A visibility enhanced broadband phase-sensitive OTDR based on the UWFBG array and frequency-division-multiplexing Open
View article: Reflection-Based Thin-Core Modal Interferometry Optical Fiber Functionalized With PAA-PBA/PVA for Glucose Detection Under Physiological pH
Reflection-Based Thin-Core Modal Interferometry Optical Fiber Functionalized With PAA-PBA/PVA for Glucose Detection Under Physiological pH Open
A phenylboronic-acid-derivatized poly (acrylic acid) (PAA-PBA)/poly(vinyl alcohol) (PVA) functionalized thin-core fiber (TCF) optical sensor is proposed for glucose detection. The unique Michelson-type fiber interferometer sensor was fabri…
View article: Numerical investigation into a surface plasmon resonance sensor based on optical fiber microring
Numerical investigation into a surface plasmon resonance sensor based on optical fiber microring Open
A reflective surface plasmon resonance (SPR) sensor based on optical fiber microring is proposed. In such a sensor, plasmons on the outer surface of the metallized channels containing analyte can be excited by a fundamental mode of a thin-…
View article: Mesenchymal stem cells in rabbit meniscus and bone marrow exhibit a similar feature but a heterogeneous multi-differentiation potential: superiority of meniscus as a cell source for meniscus repair
Mesenchymal stem cells in rabbit meniscus and bone marrow exhibit a similar feature but a heterogeneous multi-differentiation potential: superiority of meniscus as a cell source for meniscus repair Open
This study shows the similarities and differences between MMSCs and BMSCs for the first time. MMSCs are a promising source of mesenchymal stem cells in repairing meniscus defect.