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Light(Science & Applications) 2024年第7期13卷 1372-1382页

作者： Jianghui Wang Peng Zou Letian Chen Zhentao bai Hao Liu Wen-Cheng Chen yanping Huo Ben Zhong Tang Zujin Zhao State Key Laboratory of Luminescent Materials and Devices Guangdong Provincial Key Laboratory of Luminescence from Molecular AggregatesSouth China University of TechnologyGuangzhou 510640China. School of Chemical Engineering and Light Industry Guangdong University of TechnologyGuangzhou 510006China. School of Science and Engineering Shenzhen Institute of Aggregate Science and TechnologyThe Chinese University of Hong KongShenzhenGuangdong 518172China

Multi-resonance thermally activated delayed fluorescence(MR-TADF)materials are promising candidates for organic light-emitting diodes(OLEDs)with narrow electroluminescence(EL)*** researches focus on fabricating hyperfluorescence OLEDs to improve EL efficiencies of MR-TADF emitters by co-doping them with TADF sensitizers in a single host ***,in many cases,the polarity of the single host could be not suitable for both blue MRTADF emitters and blue TADF sensitizers,resulting in broadened EL spectra in high-polar hosts or decreased EL efficiencies in low-polar ***,we wish to report an efficient sensitization strategy for blue MR-TADF emitters by constructing an interlayer-sensitizing configuration,in which the blue TADF sensitizers and blue MR-TADF emitters are separated into two closely aligned host layers with high polarity and low polarity,*** on this strategy,efficient blue hyperfluorescence OLEDs are realized and verified by employing various TADF sensitizers and different MR-TADF emitters,furnishing outstanding external quantum efficiencies of up to 38.8%and narrow EL *** results validate the feasibility and universality of this interlayer sensitization strategy,which provides an effective alternative to high-performance blue hyperfluorescence OLEDs.

关键词： OLEDs interlayer sensitization

Combining Self-Organizing Map and Lipschitz Condition for Estimation in Direction of Arrival

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Open Journal of Applied Sciences 2023年第7期13卷 1012-1028页

作者： Xiuhui Tan Peng Wang Hongping Hu Rong Cheng yanping bai School of Mathematics North University of China Taiyuan China

There are many DOA estimation methods based on different signal features, and these methods are often evaluated by experimental results, but lack the necessary theoretical basis. Therefore, a direction of arrival (DOA) estimation system based on self-organizing map (SOM) and designed for arbitrarily distributed sensor array is proposed. The essential principle of this method is that the map from distance difference of arrival (DDOA) to DOA is Lipschitz continuity, it indicates the similar topology between them, and thus Kohonen SOM is a suitable network to classify DOA through DDOA. The simulation results show that the DOA estimation errors are less than 1° for most signals between 0° to 180°. Compared to MUSIC, Root-MUSIC, ESPRIT, and RBF, the errors of signals under signal-to-noise ratios (SNR) declines from 20 dB to 2 dB are robust, SOM is better than RBF and almost close to MUSIC. Further, the network can be trained in advance, which makes it possible to be implemented in real-time.

关键词： DOA Estimation Kohonen SOM Distance Difference of Arrival Topological Order Lipschitz Condition

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皮肤血络理论探析

北京中医药大学学报 2022年第9期45卷 925-928页

作者：白彦萍中日友好医院皮肤与性病科北京100029

络脉学说起源于《黄帝内经》,治法萌芽于《伤寒杂病论》,病证论治体系于《临证指南医案》初步形成,如今在许多学科中得到广泛应用。络脉学说在皮肤病领域的应用仍有待发展。皮肤络脉分为气络、津络、血络。血络主内守,气络主卫外,津络... 详细信息

络脉学说起源于《黄帝内经》,治法萌芽于《伤寒杂病论》,病证论治体系于《临证指南医案》初步形成,如今在许多学科中得到广泛应用。络脉学说在皮肤病领域的应用仍有待发展。皮肤络脉分为气络、津络、血络。血络主内守,气络主卫外,津络主充润。皮肤血络为皮肤腠理所属的有形络道,是脏腑病变传化到皮肤的必由之路。血络调和,则气络条达,津络畅通,皮肤络脉病变以皮肤血络为关键枢纽,也是皮肤病变的前提。邪气伏藏于皮肤血络,是慢性皮肤病的病机特点。笔者总结了络脉学说的渊源和现代发展,提出皮肤血络理论,并就其内涵、理论意义和临床价值进行了阐述,旨在推进络脉学说在皮肤病领域的应用。

关键词：络脉学说血络气络津络皮肤血络理论

基于BP网络的涡流探伤裂纹信号特征提取的研究

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应用基础与工程科学学报 2005年第1期13卷 105-108页

作者：杨风白艳萍中北大学自动控制系山西太原030051 中北大学数学系山西太原030051

用变频扫描励磁方法进行涡流定量检测以提取裂纹信号,利用三层结构的反向传播网络(Backpropagationnetwork,简称BP网络)建立了网络模型,并利用实际数据拟合参数,针对提离实验数据进行了计算仿真.结果表明:该网络模型算法收敛速度较快,... 详细信息

用变频扫描励磁方法进行涡流定量检测以提取裂纹信号,利用三层结构的反向传播网络(Backpropagationnetwork,简称BP网络)建立了网络模型,并利用实际数据拟合参数,针对提离实验数据进行了计算仿真.结果表明:该网络模型算法收敛速度较快,输出精确,为实现板材裂纹深度的定量标定打下了理论基础.

关键词： BP网络信号特征提取涡流探伤 network 反向传播网络裂纹信号定量检测三层结构网络模型拟合参数收敛速度模型算法计算仿真实验数据理论基础裂纹深度

Preparation and Characterization of Diatomite Loaded Composite Phase-Change Materials

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Preparation and Characterization of Diatomite Loaded Composi...

2012 China Functional Materials Technology and Industry Forum

作者： Jun Mao Shuilin Zheng Yuzhong Zhang yanping bai Yue Liu School of Chemical and Environmental Engineering China University of Mining and Technology Shenhua Shendonq Coal Group Corporation Limited

Organic phase change materials like paraffin as phase change material,modified diatomite as carrier,composite phase change material with proper phase change temperature and larger phase change enthalpy is prepared by melt *** structure and performance of composite phase material are characterized using SEM,FI-IR and synthesized thermal analyzer *** results show that the phase change temperature of composite phase change material is 30, and phase change enthalpy is 89.54J/*** every part preserved,phase change particles are distributed in the diatomite/melted paraffin matrix *** composite phase change materials are prepared with diatomite as carrier and paraffin as PCM,which are bonded with Vander Waals forces in the form of physical adsorption.

关键词： Composite Phase Material Diatomite Modification Paraffin

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异质性国际环境协议的博弈论分析

生态经济 2013年第2期29卷 54-58页

作者：白艳萍首都师范大学资源环境与旅游学院北京100048

国际环境协议是近年来环境经济学和应用博弈论中最引人注目的热点研究领域。前人的研究只建立在同质性国家基础上。从经济学角度建立异质国家模型,考虑国家在国际环境协议中成本和收益为异质的情况下,利用博弈论理论推导排放博弈和联盟... 详细信息

国际环境协议是近年来环境经济学和应用博弈论中最引人注目的热点研究领域。前人的研究只建立在同质性国家基础上。从经济学角度建立异质国家模型,考虑国家在国际环境协议中成本和收益为异质的情况下,利用博弈论理论推导排放博弈和联盟博弈中的纳什均衡,得出几点重要结论。

关键词：国际环境协议异质性博弈论

基于ICA-CEEMD小波阈值的传感器信号去噪

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振动与冲击 2017年第4期36卷 226-231,242页

作者：赫彬张雅婷白艳萍中北大学理学院太原030051

针对传感器在采集信号时混入不同的噪声,提出一种基于ICA-CEEMD小波阈值的组合去噪算法。该方法是对一维含噪信号进行剪切分段、平移和拼接,得到几个不同的含噪信号作为独立分量分析(ICA)的输入通道信号。通过ICA的盲源分离技术使得信... 详细信息

针对传感器在采集信号时混入不同的噪声,提出一种基于ICA-CEEMD小波阈值的组合去噪算法。该方法是对一维含噪信号进行剪切分段、平移和拼接,得到几个不同的含噪信号作为独立分量分析(ICA)的输入通道信号。通过ICA的盲源分离技术使得信号和噪声进行初步分离。再利用互补集合经验模态分解(CEEMD)对分离信号进行分解去噪,由于不同的高频和低频噪声,需要对分解的高阶和低阶固有模态函数(IMF)进行处理。对第一层和最后一层IMF利用3σ原则提取细节信息,进一步抑制模态混叠影响,重构去噪信号。最后,利用小波阈值对重构信号做去噪处理,提升去噪效果和性能指标。为验证该方法的有效性,进行了仿真和中北大学汾机实测实验,结果表明,该方法在去噪效果和性能指标上都优于小波软阈值去噪和基于CEEMD的小波阈值去噪方法,是一种有效的信号去噪新方法。

关键词： ICA-CEEMD 小波阈值传感器去噪 3σ原则

A Bearing Fault Diagnosis Method Based on Dictionary Learning and Parameter-Optimized Support Vector Machine

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A Bearing Fault Diagnosis Method Based on Dictionary Learnin...

作者： Jing Yang Yan Hao Ting Xu Huichao Yan Hongping Hu yanping bai Department of Mathematics School of ScienceNorth University of China

Aiming at the problem of fault diagnosis,a novel method based on dictionary learning and parameter-optimized Support Vector Machine（SVM） was proposed in this paper and applied it to bearing fault ***,the collected bearing fault signals are transformed into gray images after data ***,using dictionary learning,the gray images are denoised and output them as signal ***,the SVM multi-classification model obtained by using Grid Search（GS） algorithm to optimize penalty parameter c and kernel function parameter g is used to classify and identify the fault *** paper is based on data from Case Western Reserve University Bearing Center for experimental *** results show that the proposed model can continuously achieve the accuracy of 100% in the process of bearing fault diagnosis in different environments,which proves that the proposed method can accurately and effectively realize the fault diagnosis classification of bearings.

关键词：

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一种MEMS水听器信号去噪的组合算法研究

传感技术学报 2014年第11期27卷 1477-1481页

作者：梁斌王鹏白艳萍中北大学理学院数学系太原030051 中北大学微米纳米技术研究中心太原030051

针对MEMS水听器采集的数据"淹没"在强噪声场中的问题,提出采用LMS自适应噪声对消与Fourier变换滤波相结合的组合算法实现MEMS水听器的信噪分离。在信号频率已知的情况下,设计了一种自适应噪声对消和Fourier变换滤波组合算法的滤波器,对... 详细信息

针对MEMS水听器采集的数据"淹没"在强噪声场中的问题,提出采用LMS自适应噪声对消与Fourier变换滤波相结合的组合算法实现MEMS水听器的信噪分离。在信号频率已知的情况下,设计了一种自适应噪声对消和Fourier变换滤波组合算法的滤波器,对提取后的信号与理想信号做性能对比。仿真实验表明:该组合算法在-15 dB的强噪声场中仍有较高的分辨精度和提取效果,对搜寻类似于"黑匣子"等情况比较适宜,并将设计的滤波器用于中北汾机测试实验的信噪分离中,结果验证了该算法具有良好的高效性和实用性。

关键词： MEMS水听器信噪分离 LMS自适应噪声对消法快速Fourier变换