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Multi-functional photonic spin Hall effect sensor controlled by phase transition

Chinese Physics B 2024年第7期33卷 336-342页

作者：程杰李瑞昭程骋张亚林刘胜利董鹏 School of Science Jiangsu Province Engineering Research Center of Low Dimensional Physics and New EnergyNanjing University of Posts and TelecommunicationsNanjing 210023China College of Electronic and Optical Engineering Nanjing University of Posts and TelecommunicationsNanjing 210023China School of Electrical Engineering Research Center of Intelligent Sensor and Network Engineering Technology of Jiangsu ProvinceNanjing Vocational University of Industry TechnologyNanjing 210023China

Photonic spin Hall effect(PSHE), as a novel physical effect in light–matter interaction, provides an effective metrological method for characterizing the tiny variation in refractive index(RI). In this work, we propose a multi-functional PSHE sensor based on VO_(2), a material that can reveal the phase transition behavior. By applying thermal control, the mutual transformation into different phase states of VO_(2) can be realized, which contributes to the flexible switching between multiple RI sensing tasks. When VO_(2) is insulating, the ultrasensitive detection of glucose concentrations in human blood is achieved. When VO_(2) is in a mixed phase, the structure can be designed to distinguish between the normal cells and cancer cells through no-label and real-time monitoring. When VO_(2) is metallic, the proposed PSHE sensor can act as an RI indicator for gas analytes. Compared with other multi-functional sensing devices with the complex structures, our design consists of only one analyte and two VO_(2) layers, which is very simple and elegant. Therefore, the proposed VO_(2)-based PSHE sensor has outstanding advantages such as small size, high sensitivity, no-label, and real-time detection, providing a new approach for investigating tunable multi-functional sensors.

关键词： photonic spin Hall effect multi-functional sensors phase transition sensing performance

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Surface phonon resonance:A new mechanism for enhancing photonic spin Hall effect and refractive index sensor

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Chinese Physics B 2024年第8期33卷 254-261页

作者：程杰汪承龙李一铭张亚林刘胜利董鹏 School of Science Jiangsu Province Engineering Research Center of Low Dimensional Physics and New EnergyNanjing University of Posts and TelecommunicationsNanjing 210023China College of Electronic and Optical Engineering Nanjing University of Posts and TelecommunicationsNanjing 210023China School of Electrical Engineering Research Center of Intelligent Sensor and Network Engineering Technology of Jiangsu ProvinceNanjing Vocational University of Industry TechnologyNanjing 210023China

Metal-based surface plasmon resonance(SPR)plays an important role in enhancing the photonic spin Hall effect(SHE)and developing sensitive optical ***,the very large negative permittivities of metals limit their applications beyond the near-infrared *** this work,we theoretically present a new mechanism to enhance the photonic SHE by taking advantage of SiC-supported surface phonon resonance(SPhR)in the mid-infrared *** transverse displacement of photonic SHE is very sensitive to the wavelength of incident light and the thickness of SiC *** the optimal parameter setup,the calculated largest transverse displacement of SiC-based SPhR structure reaches up to 163.8 ym,which is much larger than the condition of ***,an NO_(2) gas sensor based on the SPhR-enhanced photonic SHE is theoretically proposed with the superior sensing *** the intensity and angle sensitivity of this sensor can be effectively manipulated by varying the damping rate of *** results may provide a promising paradigm to enhance the photonic SHE in the mid-infrared region and open up new opportunity of highly sensitive refractive index sensors.

关键词： photonic spin Hall effect refractive index sensor surface phonon resonance SiC

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Design of Intelligent Clothes Hanger System Based on Rainfall Data Analysis 10th

Design of Intelligent Clothes Hanger System Based on Rainfal...

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10th International Conference on Computer engineering and networks, CENet 2020

作者： Tao, Binbin Zhang, Jing Hu, Xusheng Wu, Jingmei Maanshan Engineering Technology Research Center for Wireless Sensor Network and IntelliSense Maanshan243031 China Wanjiang Institute of Technology Maanshan243031 China

ISBN: (纸本)9789811584619

Rainfall plays a vital role in guiding clothes drying. This paper proposes an intelligent clothes hanger system based on the analysis of rainfall data. The system consists of an electric mechanism, weather monitoring module, wireless communication module, central control module, network server, and user APP. The weather data monitored by the local weather monitoring module is uploaded to the network server in real-time, users can monitor and control the clothes hanger through the APP. Besides, the web server constructs a two-dimensional rainfall map based on the weather data provided by the clothes hangers in different geographic locations. Using the weight matrix to perform convolution operation on the rainfall map, the weighted average of the rainfall conditions at any point and its surrounding points is realized. The result is used as the rainfall risk prediction of the area corresponding to this point, used to guide drying. Finally, the feasibility of the algorithm is verified by Labview simulation. © 2021, The Editor(s) (if applicable) and The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Data handling

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Backstepping based adaptive control of magnetic levitation system

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2013 International Conference on Energy Research and Power engineering, ERPE 2013

作者： Zhou, Wei Liu, Bao Bin Jiangsu Institute of Economic and Trade Technology China Zhejiang University China Jiangsu Engineering and Technology Center of Circulation Modernization and Sensor Network China

ISBN: (纸本)9783037857588

In view of parameter uncertainty in the magnetic levitation system, the adaptive controller design problem is investigated for the system. Nonlinear adaptive controller based on backstepping is proposed for the design of the actual system with parameter uncertainty. The controller can estimate the uncertainty parameter online so as to improve control accuracy. Theoretical analysis shows that the closed-loop system is stable regardless of parameter uncertainty. Simulation results demonstrate the effectiveness of the presented method. © (2013) Trans Tech Publications Switzerland.

关键词： Backstepping

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Analysis of Satellite Interference Source Location Algorithm 7

Analysis of Satellite Interference Source Location Algorithm

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7th International Conference on Computer and Communications, ICCC 2021

作者： Yan, Hui Zhao, Laiding Zhang, Gengxin Ruan, Cen 'Telecommunication and Network' National Engineering Research Center Nanjing University of Posts and Telecommunications Key Laboratory of Broadband Wireless Communication and Sensor Network Technology Nanjing China

ISBN: (纸本)9781665409506

There are many methods and principles of satellite interference source location, but no matter which method is chosen, the positioning equation is nonlinear. Therefore, it is very important to solve the nonlinear equations accurately for the accuracy of the final positioning results. In this paper, an improved particle swarm optimization (PSO) algorithm is proposed. Based on the combination of PSO and grid search algorithm, the precision requirement is set in the iterative stop condition. When the calculation results meet the set precision, iteration can be stopped. Compared with the ordinary particle swarm optimization algorithm, the results can be obtained more quickly and accurately. © 2021 IEEE.

关键词： Satellites

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Fusion Algorithm for Foggy Image Enhancement Based on Transmittance Weight Factor 4

Fusion Algorithm for Foggy Image Enhancement Based on Transm...

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4th International Conference on Artificial Intelligence and Big Data, ICAIBD 2021

作者： Sun, Wei Zhang, Meng Wang, Jintao Wanjiang University of Technology Maanshan Wireless Sensor Network and Intelligent Perception Engineering Technology Research Center Maanshan China Wanjiang University of Technology Maanshan China

ISBN: (纸本)9780738131702

Fusion algorithm for foggy image enhancement based on transmittance weight factor is proposed. Firstly, the rough transmittance image of foggy image is obtained by the dark channel prior dehazing algorithm, and then the fine transmittance image is obtained by the guided filter. The dehazing image is obtained by the dark channel prior dehazing method based on the guided filter, and the enhanced image is obtained by histogram equalization based on the HSI color model. Finally, the weight factor is constructed by the fine transmittance, the above dehazing image and enhanced image are processed by weighted fusion. The algorithm gives full play to the respective advantages of two kinds of algorithms in foggy image processing, and significantly improves the fog removal and enhancement effect of foggy image. © 2021 IEEE.

关键词： Image enhancement

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A low power quadrature up-conversion mixer for WSN application

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High technology Letters 2013年第3期19卷 228-232页

作者：吴晨健 Li Zhiqun Institute of RF-& OE-ICs Southeast University Engineering Research Center of RF-ICs & RF-Systems Ministry of EducationSoutheast University Jiangsu Provincial Key Laboratory of Sensor Network Technology

This paper presents an up-conversion mixer for 2.4GHz wireless sensor networks in 0. 181xm RF complementary metal-oxide semiconductor （CMOS） technology. It is based on a double-balanced Gilbert cell type. With two Gilbert cells it was applied quadrature modulation. Operational ampli- tiers are used in this design to improve the conversion gain under low power consumption. The mixer design is based on 0.18txm RF CMOS process. And the mixer test results indicate that under 1.8V power supply, with input frequency 2.4 - 2.4835GHz, the conversion voltage gain is 1.2 - 2dB. When the output frequency is 2.4GHz, its power gain is -4.46dB, and its input referred 1 dB com- pression point is -11.5dBm and it consumes 1.77mA current.

关键词： mixer low power Gilbert operational amplifier

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Improved locality-sensitive hashing method for the approximate nearest neighbor problem

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Chinese Physics B 2014年第8期23卷 217-225页

作者：陆颖华马廷淮钟水明曹杰王新 Abdullah Al-Dhelaane Jiangsu Engineering Center of Network Monitoring Nanjing University of Information Science & Technology School of Computer & Software Nanjing University of Information Science & Technology School of Economic & Management Nanjing University of Information Science & Technology Huafeng Meteorological Media Group Computer Science Department College of Computer and Information Science King Saud University

In recent years, the nearest neighbor search （NNS） problem has been widely used in various interesting applications. Locality-sensitive hashing （LSH）, a popular algorithm for the approximate nearest neighbor problem, is proved to be an efficient method to solve the NNS problem in the high-dimensional and large-scale databases. Based on the scheme of p-stable LSH, this paper introduces a novel improvement algorithm called randomness-based locality-sensitive hashing （RLSH） based on p-stable LSH. Our proposed algorithm modifies the query strategy that it randomly selects a certain hash table to project the query point instead of mapping the query point into all hash tables in the period of the nearest neighbor query and reconstructs the candidate points for finding the nearest neighbors. This improvement strategy ensures that RLSH spends less time searching for the nearest neighbors than the p-stable LSH algorithm to keep a high recall. Besides, this strategy is proved to promote the diversity of the candidate points even with fewer hash tables. Experiments are executed on the synthetic dataset and open dataset. The results show that our method can cost less time consumption and less space requirements than the p-stable LSH while balancing the same recall.

关键词： approximate nearest neighbor problem locality-sensitive hashing

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Enhancing ferromagnetic coupling in CrXY(X=O,S,Se;Y=Cl,Br,I)monolayers by turning the covalent character of Cr-X bonds

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npj Computational Materials 2023年第1期9卷 1781-1786页

作者： Hao-Ran Zhu Bin Shao Xu Zuo College of Electronic Information and Optical Engineering Nankai UniversityTianjinChina Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Nankai UniversityTianjinChina Key Laboratory of Photoelectronic Thin Film Devices and Technology of Tianjin Nankai UniversityTianjinChina Engineering Research Center of Thin Film Optoelectronics Technology Ministry of EducationNankai UniversityTianjinChina

On the basis of first-principles calculations,we investigate the electronic and magnetic properties of 1T phase chromium sulfide halide CrXY(X=O,S,Se;Y=Cl,Br,I)monolayers in CrCl_(2) structure with the P3m1 space *** for the CrOI monolayer,all CrXY monolayers are stable and ferromagnetic *** results show that the ferromagnetic coupling is dominated by the kinetic exchange between the empty e_(g)-orbital of Cr atoms and the p-orbital of anions under the three-fold rotational *** this context,the coupling strength allows for being greatly enhanced by turning the nature of Cr–X bonds,i.e.,increasing the covalent contribution of the bonds by minimizing the energy difference of the coupled *** we illustrate for the example of CrOY,the Curie temperature(T_(c))is nearly tripled by substituting O by S/Se ion,eventually reaching the highest Tc in CrSeI monolayer(334 K).The high stabilities and Curie temperature manifest these monolayer ferromagnetic materials feasible for synthesis and applicable to 2D spintronic devices.

关键词： ferromagnetic bonds coupling

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A Positioning Method and Realization on Single Satellites in Different Orbits Using TDOA

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China Communications 2023年第7期20卷 108-121页

作者： Laiding Zhao Xun Zhu Gengxin Zhang Zhaowen Wang College of Telecommunications and Information Engineering Nanjing University of Posts and TelecommunicationsNanjing 210003China Key Laboratory of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and TelecommunicationsNanjing 210003China “Telecommunication and Network”National Engineering Research Center Nanjing University of Posts and TelecommunicationsNanjing 210003China Shanghai Aerospace Electronic Technology Institute Shanghai 201109China

The main geolocation technology currently used in COSPAS-SARSAT system is TDOA/FDOA or three-star TDOA,the principle is to determine the location of the signal source by using the difference in arrival time and frequency of the wireless signal between different ***,ground monitoring stations need to be equipped with more than two antenna receiving stations,and multiple satellites should be able to simultaneously relay the distress signal from the target source in order to achieve the geolocation ***,when the ground receiving system has only one antenna receiving station,or the target source is in a heavily obscured environment,the ground side is unable to receive the forwarded signals from multiple satellites at the same time,which will make it impossible to *** address these problems,in this paper,a time-sharing single satellite geolocations method based on different orbits is proposed for the first *** method uses one or several low-earth orbit satellites(LEO)and mediumearth orbit satellites(MEO)in the visible area,and the receiving station only needs one pair of receiving antennas to complete the *** can effectively compensate for the shortcomings of the traditional TDOA using the same moment and have better positioning accuracy compared with the single satellite in the same *** to the limited experimental conditions,this paper tests the navigation satellite using different orbit time-sharing single satellite geolocations,and proves that the positioning method has high positioning accuracy and has certain promotion and application value.

关键词： different orbit time-sharing non-convex optimization single satellite TDOA

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