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Seismic response analysis of damper-connected adjacent structures with stochastic parameters

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2010年第6期11卷 402-414页

作者： Dong-dong GE Hong-ping ZHU dan-sheng wang Min-shui HUANG School of Civil Engineering and Mechanics Huazhong University of Seience and Technology Wuhan 430074 China Hubei Key Laboratory of Control Structure Huazhong University of Science and Technology Wuhan 430074 China Transportation Research Center Wuhan Institute of Technology Wuhan 430073 China

Dynamic response analysis of damper connected adjacent multi-story structures with uncertain parameters is carried out.A formula of the multi degree of freedom(MDOF) for the structure-damper system with stochastic parameters is *** uncertainties of mass and stiffness are taken into consideration *** ground acceleration is represented by Kanai-Tajimi filtered non-stationary *** mean square random responses of structural displacement and story drift are chosen as the optimization *** variations of mean square responses of top floor displacements and bottom story drifts in neighboring structures with the damper stiffness and damping coefficient are analyzed in *** the parametric study,the acquiring optimum parameters of damper are regarded as numerical ***,a reducing order model of the MDOF system for adjacent structures with mean parameters is *** explicit expressions for determining optimal parameters of Kelvin model-defined damper which is used to connect adjacent single degree of freedom(SDOF) structures subjected to a white-noise excitation are employed to achieve the appropriate damper parameters,which are called theory *** a comparative study,it can be found that the theory values of damper parameters are consistent with the results based on extensive parametric *** analytical results can be obtained by using the first natural frequencies and the total mass of the adjacent deterministic structures with mean *** analytical formulas can be used to find appropriate parameters of damper between adjacent structures for engineering *** performance of damper is investigated on the basis of mitigations of mean square random responses of inter-story drifts,displacements and accelerations in adjacent *** numerical results demonstrate the robustness of coupled building control strategies.

关键词： Adjacent structures Passive control Stochastic parameters Seismic response

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1-D ELECTROMECHANICAL IMPEdanCE MODEL AND EXPERIMENTAL VERIFICATION FOR A DUAL PIEZOELECTRIC TRANSDUCER

1-D ELECTROMECHANICAL IMPEDANCE MODEL AND EXPERIMENTAL VERIF...

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2016年全国压电和声波理论及器件应用研讨会

作者： dan-sheng wang Xiao-meng ZHOU Zhi LI Hong-ping ZHU School of Civil Engineering and Mechanics Huazhong University of Science and Technology

Background, Motivation and Objective Because of the fact that the input voltage and output current are from the same part of a PZT patch during the conventional impedance measurement by using a commercial impedance analyzer, the PZT strain is almost caused by the input voltage while the influence of the structural response which matters in damage detection is nearly negligible especially when the host structure is massive. To improve the signal-to-noise ratio(SNR), a dual piezoelectric transducer comprised of two isolated but concentric segments, the inner circle part and the outer ring part, is introduced. A new one-dimensional(1D) electromechanical impedance formula for the dual piezoelectric transducer is derived based on the cylindrical coordinate system, and to validate the theoretical formula, an experiment is carried out. Statement of Contribution/Methods Considering the dual piezoelectric transducer is cylindrical, the cylindrical coordinate system is used to derive the displacement of the PZT patch when the system is simplified to a 1D structure. Combining the piezoelectric equation and boundary conditions, the 1D electromechanical impedance formula based on the cylindrical coordinate system is obtained. To verify the effectiveness of the theoretical formula, a free vibration experiment of the dual piezoelectric transducer is conduct. A special fixture is used to fix the PZT patch to simulate the free vibration condition, and an arbitrary waveform generator is used to excite the outer ring segment and a digital oscilloscope is used to acquire the input voltage of the outer ring part and the output voltage of the inner circle part. According to the input voltage and the output voltage, the admittance curve of experiment can be obtained. The frequency range of 100 k H-1MHz is chosen to compare the experimental and theoretical admittance curves. Results From the 1D electromechanical impedance formulas, it can be seen that it is similar to the active part of th

关键词： Piezoelectric impedance Dual piezoelectric transducer 1D impedance model

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Determining the location and severity of a beam crack based on piezoelectric guided wave

Determining the location and severity of a beam crack based ...

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2011年全国压电和声波理论及器件应用研讨会

作者： dan-sheng wang~(1,2,*) Hong-yuan SONG~1 dan-yan SHEN~1 Hong-ping ZHU~1 1 School of Civil Engineering & Mechanics,Huazhong University of Science and Technology,Wuhan 430074 2 Shenzhen Oceanpower Industrial Co.,Ltd,Shenzhen,518040

＜正＞In recent years,structural health monitoring has received extensive attention in civil and mechanical engineering *** to direct and converse piezoelectric effects,piezoelectric materials,such as,PZT has provided... 详细信息

关键词： Crack localization Severity PZT Guided wave Finite element simulation

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大鼠灌胃朱砂与复方牛黄消炎胶囊后汞的药代动力学研究

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中国中药杂志 2017年第14期42卷 2779-2783页

作者：宋晓妮陆宇婷杨丹亿汪生杭太俊宋敏中国药科大学药物分析学教研室江苏南京210009

复方牛黄消炎胶囊作为清热解毒、镇静消炎的经典复方,朱砂是其发挥药效的主要成分之一。该实验采用HNO_3-HClO_4消解体系结合冷原子-原子荧光光谱(CV-AFS)分析技术检测大鼠全血中的汞元素。研究大鼠灌胃给药不同剂量朱砂和复方牛黄消炎... 详细信息

复方牛黄消炎胶囊作为清热解毒、镇静消炎的经典复方,朱砂是其发挥药效的主要成分之一。该实验采用HNO_3-HClO_4消解体系结合冷原子-原子荧光光谱(CV-AFS)分析技术检测大鼠全血中的汞元素。研究大鼠灌胃给药不同剂量朱砂和复方牛黄消炎胶囊后,全血中汞的药代动力学行为,探讨中药复方配伍对汞体内代谢过程的影响。研究发现大鼠灌胃高、中、低3个剂量朱砂和复方牛黄消炎胶囊后,全血中汞均呈非线性药代动力学特征。大鼠灌胃复方牛黄消炎胶囊后,与单味朱砂相比,全血中汞元素的t_(max),Ke,CL/F显著降低,Cmax/dose,AUC/dose,t_(1/2)显著增加,V_z/F,MRT不存在显著差异,提示经复方配伍后,汞元素在全血中吸收的总量显著增加且吸收速度加快,但消除速度减慢,提示长期服用可能会引起汞在体内的蓄积。

关键词：朱砂复方牛黄消炎胶囊汞全血冷原子-原子荧光光谱(CV-AFS)

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STRENGTH MONITORING OF CONCRETE BASED ON EMBEDDED PZT TRANSDUCER AND THE RESONANT FREQUENCY

STRENGTH MONITORING OF CONCRETE BASED ON EMBEDDED PZT TRANSD...

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2010全国压电和声波理论及器件技术研讨会

作者： dan-sheng wang~(1,2),Liang-ping YU~1,Hong-ping ZHU~1 1 School of Civil Engineering & Mechanics,Huazhong University of Science & technology, 1037 Luoyu Road,Wuhan,Hubei 430074,China 2 Shenzhen Ocean Power Industrial Co.Ltd. Chegongmiao,Shenzhen,Guangdong 518040,China

Piezoelectric lead zirconate titanate(PZT) transducer in the electromechanical impedance(EMI) technique has emerged as a potential sensing tool for structural health *** the EMI technique,PZT acts as both sensor and actuator simultaneously due to its direct and inverse piezoelectric *** EMI method using PZT transducers provide a new way for in-situ nondestructive testing of concrete strength development since the conventional nondestructive detection techniques have many *** paper presents an experimental study on monitoring the concrete cubes' compressive strength based on embedded PZT impedance *** monitoring the PZT admittance(inversion of impedance) signals in different concrete ages the compressive strength development of concrete is predicted *** addition, coipbining with the index of the resonant frequency,the correlation between concrete strength and the resonant frequency of the PZT admittance is *** the study,the feasibility of the EMI method based on embedded PZT transducers for monitoring the concrete strength development in early ages is verified,and it is found that the resonance frequency of the PZT admittance has a good reflection to the concrete age and the strength development of concrete.

关键词： Concrete strength health monitoring PZT EMI

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L-半胱氨酸修饰金电极对邻苯二酚和对苯二酚的电催化及分析应用

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分析测试学报 2001年第5期20卷 18-20页

作者：杜丹王升富黄春保湖北大学化学与材料科学学院湖北武汉430062 黄冈师范学院化学系湖北黄冈438000

研究了L_半胱氨酸自组装膜修饰金电极的电化学行为,发现其对邻苯二酚和对苯二酚的电化学氧化具有明显的电催化作用 ,使它们的氧化电位降低 ,峰电流显著增大;初步探讨了电催化机理;将该膜电极用于对苯二酚的定量测定 ,发现其氧化峰电流... 详细信息

研究了L_半胱氨酸自组装膜修饰金电极的电化学行为,发现其对邻苯二酚和对苯二酚的电化学氧化具有明显的电催化作用 ,使它们的氧化电位降低 ,峰电流显著增大;初步探讨了电催化机理;将该膜电极用于对苯二酚的定量测定 ,发现其氧化峰电流与对苯二酚浓度在1.0×10-4～3.0×10-2 mol·L-1 范围内成良好的线性关系 ,相关系数0.9974 ,检出限为2.0×10-5 mol·L-1;用于照相显影液中对苯二酚的测定 ,获得满意结果。

关键词：单分子膜化学修饰电极 L-半胱氨酸邻苯二酚对苯二酚照相显影液测定电催化氧化分析

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吡啶-Dawson型磷钼杂多酸超分子薄膜修饰电极

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分析测试学报 2001年第4期20卷 29-32页

作者：杜丹王升富黄春保湖北大学化学与材料科学学院湖北武汉430062 黄冈师范学院化学系湖北黄冈438000

采用电化学方法在玻碳电极上制备了吡啶 -Dawson型磷钼杂多酸超分子配合物薄膜修饰电极。研究了它在0.3mol/LH2SO4 溶液中的电化学行为及其对酸性水溶液中抗坏血酸的电催化氧化作用。发现膜电极对抗坏血酸的催化峰电流与其浓度在3.5×1... 详细信息

采用电化学方法在玻碳电极上制备了吡啶 -Dawson型磷钼杂多酸超分子配合物薄膜修饰电极。研究了它在0.3mol/LH2SO4 溶液中的电化学行为及其对酸性水溶液中抗坏血酸的电催化氧化作用。发现膜电极对抗坏血酸的催化峰电流与其浓度在3.5×10-5～5.0×10-3 mol/L范围内呈良好的线性关系 ,线性相关系数r=0.9991 ,检出限8.0×10-6 mol/L ,用于维生素C片剂的测定 ,结果令人满意。

关键词：磷钼杂多酸超分子薄腊抗坏血酸化学修饰电极电催化氧化吡啶配合物薄膜维生素C片剂测定

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Constructing 2D bismuth-based heterostructure for highly efficient photocatalytic CO2 reduction

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Tungsten 2025年第1期 71-79页

作者： Ruo-Hang Xu Hao-Yu Jiang dan-dan Cui Kun-Rong Du Hong-Run Zhang sheng-Jie Xu Ya-Qi Li Zhi-Zhen Ren Liang wang Wei-Chang Hao Yi Du School of Physics and BUAA-UOW Joint Research Centre Beihang University Shenzhen Institute of Beihang University Centre for Catalysis and Clean Energy School of Environment and Science Griffith University

Reforming carbon dioxide（CO2） into fuels and valuable chemicals using solar energy holds significant potential for emission reduction and addressing energy supply *** recombination of photocarriers remains a major obstacle,however,to enhancing solar energy conversion efficiency in the photocatalytic reaction *** two-dimensional materials,constructing heterogeneous structures has emerged as an effective strategy to enhance the separation of photoexcited carriers by leveraging the internal electric field at the heterogeneous ***,we present a facile strategy for preparing Bi4NbO8Br/Bi2WO6plate-on-plate Z-scheme junctions with a strong internal electric field by in situ *** unique heterostructure facilitates efficient separation and transport of photoexcited charges by harnessing the internal electric field induced by chemical bonding at the lateral ***,the Bi4NbO8Br/Bi2WO6heterostructure exhibits enhanced CO2photoreduction properties,along with a CO yield rate of approximately 35 μmol·g-1·h-1under full light *** work offers novel insights into the synthesis of unique hetero structures intended to enhance the efficiency of photocatalytic CO2reduction.

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BIAS ERRORS INDUCED BY CONCENTRATION GRADIENT IN SEDIMENT-LADEN FLOW MEASUREMENT WITH PTV

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Journal of Hydrodynamics 2012年第5期24卷 668-674页

作者： LI dan-xun LIN Qiu-sheng ZHONG Qiang wang Xing-kui State Key Laboratory of Hydroscience and Engineering Tsinghua UniversityBeijing 100084China

Sediment-laden flow measurement with Particle Tracking Velocimetry （PTV） introduces a series of finite-sized sampling bins along the vertical of the flow. Instantaneous velocities are collected at each bin and a significantly large sample is established to evaluate mean and root mean square （rms） velocities of the flow. Due to the presence of concentration gradient, the established sample for the solid phase involves more data from the lower part of the sampling bin than from the upper part. The concentration effect causes bias errors in the measured mean and rms velocities when velocity varies across the bin. These bias errors are analyti- cally quantified in this study based on simplified linear velocity and concentration distributions. Typical bulk flow characteristics from sediment-laden flow measurements are used to demonstrate rough estimation of the error magnitude. Results indicate that the mean velocity is underestimated while the rms velocity is overestimated in the ensemble-averaged measurement. The extent of devia- tion is commensurate with the bin size and the rate of concentration gradient. Procedures are proposed to assist determining an appro- priate sampling bin size in certain error limits.

关键词： bias error velocity concentration gradient

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Approximation by Neural Networks with Sigmoidal Functions

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Acta Mathematica Sinica,English Series 2013年第10期29卷 2013-2026页

作者： dan sheng YU Department of Mathematics Hangzhou Normal University

In this paper, we introduce a type of approximation operators of neural networks with sigmodal functions on compact intervals, and obtain the pointwise and uniform estimates of the ap- proximation. To improve the approximation rate, we further introduce a type of combinations of neurM networks. Moreover, we show that the derivatives of functions can also be simultaneously approximated by the derivatives of the combinations. We also apply our method to construct approximation operators of neural networks with sigmodal functions on infinite intervals.

关键词： Feedforward neural networks sigmoidal functions simultaneous approximation combi-nations

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