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| 1 | Ultrasensitive broadband phototransistors based on perovskite/organic-semiconductor vertical heterojunctions显示文摘Organolead halide perovskites have emerged as the most promising materials for various optoelectronic devices,especially solar cells,because of their excellent optoelectronic properties.Here,we present the first report of low-voltage high-gain phototransistors based on perovskite/organic-semiconductor vertical heterojunctions,which show ultrahigh responsivities of~10^(9)A W^(–1) and specific detectivities of~10^(14) Jones in a broadband region from the ultraviolet to the near infrared.The high sensitivity of the devices is attributed to a pronounced photogating effect that is mainly due to the long carrier lifetimes and strong light absorption in the perovskite material.In addition,flexible perovskite photodetectors have been successfully prepared via a solution process and show high sensitivity as well as excellent flexibility and bending durability.The high performance and facile solution-based fabrication of the perovskite/organic-semiconductor phototransistors indicate their promise for potential application for ultrasensitive broadband photodetection. | Chao Xie Peng You Zhike Liu Li Li Feng Yan | 2017 | Light(Science & Applications)2017，6，1： | 12 |
| 2 | Targeted energy transfer of a parallel nonlinear energy sink显示文摘A parallel nonlinear energy sink(NES) is proposed and analyzed. The parallel NES is composed of a vibro-impact(VI) NES and a cubic NES. The dynamical equation is given, and the essential analytical investigation is carried out to deal with the cubic nonlinearity and impact nonlinearity. Multiple time-scale expansion is introduced, and the zeroth order is derived to give a rough outline of the system. The underlying Hamilton dynamic equation is given, and then the optimal stiffness is expressed. The clearance is regarded as a critical factor for the VI. Based on the periodical impact treatment by analytical investigation, the relationships of the cubic stiffness, the clearance, and the zeroth-order attenuation amplitude of the linear primary oscillator(LPO) are obtained.A cubic NES under the optimal condition is compared with the parallel NES. Harmonic signals, harmonic signals with noises, and the excitation generated by a second-order?lter are considered as the potential excitation forces on the system. The targeted energy transfer(TET) in the designed parallel NES is shown to be more e?cient. | Yimin WEI Sha WEI Qianlong ZHANG Xinjian DONG Zhike PENG Wenming ZHANG | 2019 | Applied Mathematics and Mechanics(English Edition)2019，40，5： | 4 |
| 3 | Power fluctuation and power loss of wind turbines due to wind shear and tower shadow显示文摘 | Binrong WEN Sha WEI Kexiang WEI Wenxian YANG Zhike PENG Fulei CHU | 2017 | Frontiers of Mechanical Engineering2017，12，3： | 4 |
| 4 | Parametric identification of time-varying systems from free vibration using intrinsic chirp component decomposition显示文摘Time-varying systems are applied extensively in practical applications,and their related parameter identification techniques are of great significance for structural health monitoring of time-varying systems.To improve the identification accuracy for time-varying systems,this study puts forward a novel parameter identification approach in the time-frequency domain using intrinsic chirp component decomposition(ICCD).ICCD is a powerful tool for signal decomposition and parameter extraction,with good signal reconstruction capability in a high-noise environment.To maintain good identification effects for the time-varying system in a noisy environment,the proposed method introduces a redundant Fourier model for the non-stationary signal,including instantaneous frequency(IF)and instantaneous amplitude(IA).The accuracy and effectiveness of the proposed approach are demonstrated by a single-degree-of-freedom system with three types of time-varying parameters,as well as an example of a multi-degree-of-freedom system.The effects of different levels of measured noise on the identified results are also discussed in detail.Numerical results show that the proposed method is very effective in tracking the smooth,periodical,and non-smooth variations of time-varying systems over the entire identification time period even when the response signal is contaminated by intense noise. | Sha Wei Shiqian Chen Xingjian Dong Zhike Peng Wenming Zhang | 2020 | Acta Mechanica Sinica2020，36，1： | 3 |
| 5 | Non-stationary signal analysis based on general parameterized time-frequency transform and its application in the feature extraction of a rotary machine显示文摘 | Peng ZHOU Zhike PENG Shiqian CHEN Yang YANG Wenming ZHANG | 2018 | Frontiers of Mechanical Engineering2018，13，2： | 3 |
| 6 | Magnetic levitation using diamagnetism:Mechanism,applications and prospects显示文摘As a typical contact-free manipulation technique that removes friction and contamination risk,levitation has gradually become a preferred candidate for various applications.Magnetic levitation using diamagnetism,beyond Earnshaw’s theorem,is a kind of passive stable levitation that can be achieved at normal temperatures with no energy input.Appealingly,most seemingly nonmagnetic materials can be levitated in a magnetic field and can stabilize free levitation of magnetic materials.This review focuses on the fundamental principles of magnetic levitation using diamagnetism,with emphasis on its burgeoning applications.The theoretical basis associated with the magnetic levitation using diamagnetism is discussed by elucidating the characteristics of diamagnetic materials,and the key levitation mechanisms are clarified.Afterwards,state-of-the-art applications in various aspects,including sensing and measurement,actuating and micromanipulation,energy harvesting and magnetic gravity compensation,are summarized and compared.Finally,the review concludes with a brief outlook on future perspectives. | GAO QiuHua YAN Han ZOU HongXiang LI WenBo PENG ZhiKe MENG Guang ZHANG WenMing | 2021 | Science China(Technological Sciences)2021，64，1： | 3 |
| 7 | Interfacial engineering of printable bottom back metal electrodes for full-solution processed flexible organic solar cells显示文摘Printing of metal bottom back electrodes of flexible organic solar cells(FOSCs) at low temperature is of great significance to realize the full-solution fabrication technology. However, this has been difficult to achieve because often the interfacial properties of those printed electrodes, including conductivity, roughness, work function,optical and mechanical flexibility, cannot meet the device requirement at the same time. In this work, we fabricate printed Ag and Cu bottom back cathodes by a low-temperature solution technique named polymer-assisted metal deposition(PAMD) on flexible PET substrates. Branched polyethylenimine(PEI) and ZnO thin films are used as the interface modification layers(IMLs) of these cathodes. Detailed experimental studies on the electrical, mechanical, and morphological properties, and simulation study on the optical properties of these IMLs are carried out to understand and optimize the interface of printed cathodes. We demonstrate that the highest power conversion efficiency over 3.0% can be achieved from a full-solution processed OFSC with the device structure being PAMDAg/PEI/P3 HT:PC_(61)BM/PH1000. This device also acquires remarkable stability upon repeating bending tests. | Hongyu Zhen Kan Li Yaokang Zhang Lina Chen Liyong Niu Xiaoling Wei Xu Fang Peng You Zhike Liu Dongrui Wang Feng Yan Zijian Zheng | 2018 | Journal of Semiconductors2018，39，1： | 2 |
| 8 | Dynamic Characteristics of Rotor System with a Slant Crack Based on Fractional Damping显示文摘The traditional modeling method of rotor system with a slant crack considers only integer-order calculus.However,the model of rotor system based on integer-order calculus can merely describe local characteristics,not historical dependent process.The occur of fractional order calculus just makes up for the deficiency in integer-order calculus.Therefore,a new dynamic model with a slant crack based on fractional damping is proposed.Here,the stiffness of rotor system with a slant crack is solved by zero stress intensity factor method.The proposed model is simulated by Runge-Kutta method and continued fraction Euler method.The influence of the fractional order,rotating speed,and crack depth on the dynamic characteristics of rotor system is discussed.The simulation results show that the amplitude of torsional excitation frequency increases significantly with the increase of the fractional order.With the increase of the rotating speed,the amplitude of first harmonic component becomes gradually larger,the amplitude of the second harmonic becomes smaller,while the amplitude of the other frequency components is almost invariant.The shaft orbit changes gradually from an internal 8-type shape to an ellipse-type shape without overlapping.With the increase of the slant crack depth,the amplitude of the transverse response frequency in the rotor system with a slant crack increases,and the amplitude in the second harmonic component also increases significantly.In addition,the torsional excitation frequency and other coupling frequency components also occur.The proposed model is further verified by the experiment.The valuable conclusion can provide an important guideline for the fault diagnosis of rotor system with a slant crack. | Zhinong Li Yunlong Li Dong Wang Zhike Peng Haifeng Wang | 2021 | Chinese Journal of Mechanical Engineering2021，34，2： | 2 |
| 9 | Res-onances and resonant frequencies for a class of nonlin-ear system显示文摘 | PENG Zhike LANG Zhiqiang BILLINGS S A | 2007 | Journal of Sound and Vibration2007，300，345： | 1 |
| 10 | Application of the wavelet transform in machine condition monitoring and fault diagnostics: A review with bibliography显示文摘 | PENG Zhike CHU Fulei | 2004 | Mechanical Systems and Signal Processing2004，18，2： | 1 |
| 11 | On the energy leakage of discrete wavelet transform 显示文摘 | PENG Zhike JACKSON R R CHU Fulei | 2009 | Mechanical Systems and Signal Processing2009，23，2： | 1 |
| 12 | Application of the wavelet transform in machine condition monitoring and fault diagnostics: a review with bibliography显示文摘 | Peng ZhiKe Chu FuLei | 2004 | Mechanical Systems and Signal Processing2004，18，： | 1 |
| 13 | A Comparison Study of Improved Hilbert-Huang Transform and Wavelet Trans- form: Application to Fault Diagnosis for Rolling Beating 显示文摘 | Peng Zhike Tse P W Chu Fulei | 2005 | Mechanical Systems and Signal Processing2005，19，5： | 1 |
| 14 | Application of the wavelet transform in machine condition monitoring and fault diagnostics:a review with bibliography显示文摘 | Peng Zhike Chu Fulei | 2004 | Mechanical Systems and Signal Processing2004，18，2： | 1 |
| 15 | An improved Hilbert-Huang transform and its application in vibration analysis显示文摘 | Peng Zhike Peter W T Chu Fulei | 2005 | Journal of Sound and Vibration2005，286，12： | 1 |
| 16 | Stability Analysis of a Rotor - Bearing System with Time - Var- ying Bearing Stiffness Due to Finite Number of Balls and Unbalanced Force 显示文摘 | Zhang Xuening Han Qinkai Peng Zhike | 2013 | Journal of Sound and Vi- bration2013，332，25： | 1 |
| 17 | Modal identification of multi-degree-of-freedom structures based on intrinsic chirp component decomposition method显示文摘Modal parameter identification is a mature technology.However,there are some challenges in its practical applications such as the identification of vibration systems involving closely spaced modes and intensive noise contamination.This paper proposes a new time-frequency method based on intrinsic chirp component decomposition(ICCD)to address these issues.In this method,a redundant Fourier model is used to ameliorate border distortions and improve the accuracy of signal reconstruction.The effectiveness and accuracy of the proposed method are illustrated using three examples:a cantilever beam structure with intensive noise contamination or environmental interference,a four-degree-of-freedom structure with two closely spaced modes,and an impact test on a cantilever rectangular plate.By comparison with the identification method based on the empirical wavelet transform(EWT),it is shown that the presented method is effective,even in a high-noise environment,and the dynamic characteristics of closely spaced modes are accurately determined. | Sha WEI Shiqian CHEN Zhike PENG Xingjian DONG Wenming ZHANG | 2019 | Applied Mathematics and Mechanics(English Edition)2019，40，12： | 1 |
| 18 | A comparison studyof improved Hilbert-Huang transform and wavelettransform : Application to fault diagnosis for rollingbearing显示文摘 | PENG Zhike TSE PW CHU Fulei | 2005 | Mechanical Systems and Signal Processing2005，19，： | 1 |
| 19 | Effects of anti-symmetric nonlinear viscous damping on the force transmissibility of multi-degree of freedom structures显示文摘In the present study, the concept of the output frequency response function is applied to theoretically investigate the force transmissibility of multi-degree of freedom (MDOF) structures with a nonlinear anti-symmetric viscous damping. The results reveal that an anti-symmetric nonlinear viscous damping can significantly reduce the transmissibility over all resonance regions for MDOF structures while it has almost no effect on the transmissibility over non-resonant and isolation regions. The results indicate that the vibration isolators with an anti-symmetric damping characteristic have great potential to overcome the dilemma in the design of linear viscously damped vibration isolators where an increase of the damping level reduces the force transmissibility over resonant region but increases the transmissibility over non-resonant regions. | Zhike Peng,1, ) and Zhiqiang Lang2 1)State Key Laboratory of Mechanical System and Vibration, Shanghai Jiao Tong University, Shanghai 200240, China 2)Department of Automatic Control and Systems Engineering, University of Sheffeld Mappin Street, Sheffeld, S1 3JD, UK | 2011 | Theoretical & Applied Mechanics Letters2011，1，6： | 1 |
| 20 | Application of wavelet transform in machine condition monitoring and fault diagnostics: A review with bibliography显示文摘 | PENG Zhike CHU Fulei | 2004 | Mechanical Systems and Signal Processing2004，18，： | 1 |
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