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第五届新型太阳能电池学术研讨会

作者： Xiao Bai Xiaoping Zou Jialin Zhu Yaxian Pei Ying Yang Wenbin Jin Dan Chen Haiyan Ren Research Center for Sensor Technology Beijing Key Laboratory for SensorMinistry of Education Key Laboratory for Modern Measurement and Control TechnologySchool of Applied Sciences Beijing Information Science and Technology UniversityJianxiangqiao Campus

In this paper, a novel morphology transformation of MAPbI films which were doped with Rb and prepared by spin coating on a"mp-TiO/bl-TiO/FTO" substrate was demonstrated. A slight blue shift of the PL peak for MAPbI with increase in Rb I concentration was shown. The electronic properties of perovskite films, especially,conductivity type could be significantly tuned from n-type to p-type by doping with *** concentration and mobility could be controlled by adjusting dopant *** investigation of the semiconductor properties of perovskite may shine light on future rational design of novel and more efficient perovskite solar cells [1].

关键词： MAPbI3 perovskite layer Modulating grain shape and semiconductor properties Rb doping

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Effect of Annealing Process on CH3NH3PbI3-XClX Film Morphology of Planar Heterojunction Perovskite Solar Cells with Optimal Compact TiO2 Layer

Effect of Annealing Process on CH3NH3PbI3-XClX Film Morpholo...

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第五届新型太阳能电池学术研讨会

作者： Dan Chen Xiaoping Zou Hong Yang Ningning Zhang Wenbin Jin Xiao Bai Ying Yang Tao Ling Research Center for Sensor Technology Beijing Key Laboratory for SensorMinistry of Education Key Laboratory for Modern Measurement and Control TechnologySchool of Applied Sciences Beijing Information Science and Technology UniversityJianxiangqiao Campus

The morphology of compact TiO film used as an electron-selective layer and perovskite film used as a light absorption layer in planar perovskite solar cells has a significant influence on the photovoltaic performance of the devices. In this paper, the spin-coating speed of the compact TiO is investigated in order to get a high-quality film and the compact TiO film exhibits pinhole-and crack-free films treated by 2000 rpm for 60 s. Furthermore, the effect of annealing process, including annealing temperature and annealing program, on CHNHPbICl film morphology is studied. At the optimal annealing temperature of 100℃, the CHNHPbICl morphology fabricated by multistep slow annealing method has smaller grain boundaries and holes than that prepared by one-step direct annealing method, which results in the reduction of grain boundary recombination and the increase of Voc. With all optimal procedures, a planar fluorine-doped tin oxide（FTO） substrate/compact TiO/CHNHPbICl/SpiroMeO TAD/Au cell is prepared for an active area of 0.1 cm. It has achieved a power conversion efficiency（PCE） of 14.64%, which is 80.3% higher than the reference cell（8.12% PCE） without optimal perovskite layer. We anticipate that the annealing process with optimal compact TiO layer would possibly become a promising method for future industrialization of planar perovskite solar cells [1].

关键词： Planar Heterojunction Perovskite Solar Cells Annealing Process Compact TiO2 Layer

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Combination of high order polarization vortex beams using Hermite–Gauss beams

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Optical and Quantum Electronics 2018年第4期50卷 1-11页

作者： Jing-tao Xin Ming-li Dong Xiao-ping Lou Lian-qing Zhu Beijing Engineering Research Center of Optoelectronic Information and Instruments Beijing Information Science and Technology University Beijing China Key Laboratory of Modern Measurement Control Technology Ministry of Education Beijing China Beijing Key Laboratory of Optoelectronic Test Technology Beijing Information Science and Technology University Beijing China

A method to combine arbitrary order polarization vortex beams (PVBs) by Hermite–Gauss mode beams with designed field distributions is proposed. The orders of PVBs are determined by the modes of HG beams which are used in the combination scheme and the intensity distributions are the same as those of Laguerre–Gaussian beams. Simulations and experiments were also demonstrated, which verifies the feasibility of the proposed method.

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Secure communications in a unified non-orthogonal multiple access framework

arXiv

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arXiv 2019年

作者： Yue, Xinwei Liu, Yuanwei Yao, Yuanyuan Li, Xuehua Liu, Rongke Nallanathan, Arumugam School of Information and Communication Engineering Key Laboratory of Modern Measurement & Control Technology Ministry of Education Beijing Information Science and Technology University Beijing100101 China School of Electronic Engineering and Computer Science Queen Mary University of London LondonE1 4NS United Kingdom School of Electronic and Information Engineering Beihang University Beijing100191 China

This paper investigates the impact of physical layer secrecy on the performance of a unified non-orthogonal multiple access (NOMA) framework, where both external and internal eavesdropping scenarios are examined. The spatial locations of legitimate users (LUs) and eavesdroppers are modeled by invoking stochastic geometry. To characterize the security performance, new exact and asymptotic expressions of secrecy outage probability (SOP) are derived for both code-domain NOMA (CD-NOMA) and power-domain NOMA (PD-NOMA), in which imperfect successive interference cancellation (ipSIC) and perfect SIC (pSIC) are taken into account. For the external eavesdropping scenario, the secrecy diversity orders by a pair of LUs (the n-th user and m-th user) for CD/PD-NOMA are obtained. Analytical results make known that the diversity orders of the n-th user with ipSIC/pSIC for CD-NOMA and PD-NOMA are equal to zero/ K and zero/one, respectively. The diversity orders of the m-th user are equal to K/one for CD/PD-NOMA. For the internal eavesdropping scenario, we examine the analysis of secrecy diversity order and observe that the m-th user to wiretap the n-th user with ipSIC/pSIC for CD-NOMA and PDNOMA provide the diversity orders of zero/K and zero/one, respectively, which is consistent with external eavesdropping scenario. Numerical results are present to confirm the accuracy of the analytical results developed and show that: i) The secrecy outage behavior of the n-th user is superior to that of the m-th user;ii) By increasing the number of subcarriers, CD-NOMA is capable of achieving a larger secrecy diversity gain compared to PD-NOMA. Copyright © 2019, The Authors. All rights reserved.

关键词： Geometry

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Design of Trajectory Planning System for River Crab Farming with Automatic Feeding Boat

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Journal of Physics: Conference Series 2020年第1期1575卷

作者： Xiaoyu Wang Jianqing Hong Yueping Sun Dean Zhao School of Electrical and Information Engineering Jiangsu University Zhenjiang 212013 China School of Modern Equipment Manufacturing Zhenjiang College Zhenjiang 212028 China School Key Laboratory of Facility Agriculture Measurement and Control Technology and Equipment of Machinery Industry Jiangsu University Zhenjiang 212013 China

The bait feeding of river crab farming needs to be covered evenly on the whole pond. At present, feeding is mainly carried out by manual driving or remote control ship-borne feeding machine on the pond. The feeding accuracy and efficiency are relatively low, and it is difficult to guarantee feeding effect. In view of the above situation, based on the mobile automatic feeding boat equipped with GPS, this paper proposes a complete coverage trajectory planning method with irregular quadrilateral pond, and a trajectory planning system based on SuperMap Objects is designed to generate reciprocating traverse feeding trajectory automatically. The simulation is performed to verify the feasibility of the trajectory planning method. The results show that the trajectory planning system can meet the requirements of automatic and uniform feeding on the crab pond.

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Image enhancement algorithm of Dongba manuscripts based on wavelet analysis and grey relational theory 13

Image enhancement algorithm of Dongba manuscripts based on w...

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2017 13th IEEE International Conference on Electronic measurement & Instruments (ICEMI)

作者： Xia Xinyu Wu Guoxin Zhu Chunmei Ding Chunyan Geng Qiaoman Key Laboratory of Modern Measurement & Control Technology Ministry of Education Beijing Information Science & Technology University Minzu University of China

ISBN: (纸本)9781509050369;9781509050352

Image enhancement is an important part of the image processing of Dongba manuscripts. For the low-contrast and fuzzy Dongba manuscripts image, in this paper, an image enhancement algorithm based on wavelet analysis and grey relational analysis is proposed. Firstly, the wavelet transform is used to decompose the Dongba manuscripts image into three levels, and the corresponding low-frequency components and high-frequency components are obtained. Then, the interference signal and the useful signal in the high frequency component are distinguished by the grey relation analysis theory. Finally, inverse wavelet transformation is used to reconstruct the image so that the contrast enhancement and background suppression can be achieved. The experimental results show that compared with the conventional filtering method and wavelet threshold denoising enhancement method, the proposed method has the highest peak signal-to-noise ratio, suppresses the noise while enhancing the image details and improving the image contrast.

关键词： wavelet transform grey relation analysis image enhancement Dongba manuscripts image

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Research on denoising methods of linear CCD spectrum data using combined filter based on wavelet threshold 13

Research on denoising methods of linear CCD spectrum data us...

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2017 13th IEEE International Conference on Electronic measurement & Instruments (ICEMI)

作者： Zhang Long Wu Guoxin Ding Chunyan Lu Jiwei Key Laboratory of Modern Measurement & Control Technology Ministry of Education Beijing Information Science & Technology University Minzu University of China

ISBN: (纸本)9781509050369;9781509050352

Due to the influence of various factors, such as the test environment, the instrument itself and the target's spectrum characteristics, the measured linear CCD spectrum data contains noise. If the noise can not be removed effectively, the results of spectrum detection will be affected. Since the noise contained in the linear CCD spectrum data is mainly Gauss white noise and impulsive noise, a combined filter method based on wavelet threshold and median filter is proposed to denoise the linear CCD spectrum data in this paper. The simulation spectrum data and the measured spectrum data captured by spectrum instrument are used to check the validity of this method. The simulation results show that using the combined filter method, the noise of the spectrum data can be effectively reduced, and the signal-to-noise ratio of the spectrum signal is improved.

关键词： linear CCD spectrum data denoising wavelet threshold median filter combined filter

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Finite element simulation of on-line wear debris monitoring sensor based on JMAG 13

Finite element simulation of on-line wear debris monitoring ...

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2017 13th IEEE International Conference on Electronic measurement & Instruments (ICEMI)

作者： Peng Feng Wang Liyong Chen Tao Beijing Information Science and Technology University Key Ministry of Education Key Laboratory of Modern Measurement and Control Technology Collaborative Innovation Center of Electric Vehicles in Beijing

ISBN: (纸本)9781509050369;9781509050352

Aiming at the wear debris sensor in the wear debris on-line monitoring system, the variation of the magnetic field distribution and the induced voltage of the induction coil in the working state is simulated. Taking into account the coil material, turns and excitation coil excitation power supply voltage, frequency and other factors. The three-dimensional finite element model of sensor coil structure was established by JMAG Designer software. The simulation results reveal the influence of different turns, power supply and so on in the internal magnetic field distribution and the voltage in the induction coil. The related conclusions have certain guiding significance to the design parameters of such sensor structure, which is of great value to the development of wear debris on-line monitoring system

关键词： Sensor Wear debris monitoring Electromagnetic induction Finite element method

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Ferrographic analysis in wear fault diagnosis for the confluent planetary gear mechanism 13

Ferrographic analysis in wear fault diagnosis for the conflu...

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2017 13th IEEE International Conference on Electronic measurement & Instruments (ICEMI)

作者： Lv Wenxiu Wang Liyong Chen Tao Beijing Information Science and Technology University Key Ministry of Education key Laboratory of Modern Measurement and Control Technology Collaborative Innovation Center of Electric Vehicles in Beijing

ISBN: (纸本)9781509050369;9781509050352

The principle of ferrography, the method of preparing sample and the procedure of ferrography analysis were introduced. The main morphology characteristics of abrasive in the abnormal wear stage of the confluent planetary gear mechanism were analyzed. It could be found that the fault predicted by the identification and analysis of the abrasive particles image of the oil was coincided with the fault of actual disassembly and assembly detection. That could be good for extending the application of ferrography in fault diagnosis.

关键词： Ferrography Oil analysis the confluent planetary gear mechanism

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Fitting algorithm for interferometric spectrum of fiber Fabry-Perot cavity acoustic sensors

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IOP Conference Series: Earth and Environmental Science 2019年第3期310卷

作者： Changkun Yu Jin Cheng Yangmeng Tian Xiaoping Zou Research Center for Sensor Technology Beijing Key Laboratory for Sensor Ministry of Education Key Laboratory for Modern Measurement and Control Technology School of Applied Sciences Beijing Information Science and Technology University Beijing 100101 China

Fiber Fabry-Perot cavity acoustic sensors have been widely used in some fields recently due to its advantages such as high sensitivity, resistance to electromagnetic interference, etc. In order to control the performance of the sensors, it is necessary to precisely adjust the cavity length. In order to obtain the cavity length efficiently and accurately, a fitting algorithm for interference spectrum is proposed in this paper. The base of the algorithm is the principle of light interference and the key of the algorithm is to find the peaks and valleys of the interference spectrum. Experimental results show that the algorithm has a high fitting degree.

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