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Graphene binding on black phosphorus enables high on/off ratios and mobility

National Science review 2024年第2期11卷 188-195页

作者： Fanrong Lin Zhonghan Cao Feiping Xiao Jiawei Liu Jiabin Qiao Minmin Xue Zhili Hu Ying Liu Huan Lu Zhuhua Zhang Jens Martin Qingjun Tong Wanlin Guo Yanpeng Liu Key Laboratory for Intelligent Nano Materials and Devices of Ministry of Education State Key Laboratory of Mechanics and Control of Mechanical Structures and Institute for Frontier Science Nanjing University of Aeronautics and Astronautics Centre for Advanced 2D Materials National University of Singapore School of Physics and Electronics Hunan University Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and MeasurementSchool of PhysicsBeijing Institute of Technology Leibniz Institute für Kristallzüchtung

Graphene is one of the most promising candidates for integrated circuits due to its robustness against short-channel effects, inherent high carrier mobility and desired gapless nature for Ohmic contact, but it is difficult to achieve satisfactory on/off ratios even at the expense of its carrier mobility, limiting its device applications. Here, we present a strategy to realize high back-gate switching ratios in a graphene monolayer with well-maintained high mobility by forming a vertical heterostructure with a black phosphorus multi-layer. By local current annealing, strain is introduced within an established area of the graphene, which forms a reflective interface with the rest of the strain-free area and thus generates a robust off-state via local current depletion. Applying a positive back-gate voltage to the heterostructure can keep the black phosphorus insulating, while a negative back-gate voltage changes the black phosphorus to be conductive because of hole accumulation. Then, a parallel channel is activated within the strain-free graphene area by edge-contacted electrodes, thereby largely inheriting the intrinsic carrier mobility of graphene in the on-state. As a result, the device can provide an on/off voltage ratio of >10～3 as well as a mobility of ～8000 cm2V-1s-1at room temperature, meeting the low-power criterion suggested by the International roadmap for devices and systems.

关键词： graphene on/off ratio mobility black phosphorus reflective interface

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Non-specific/specific SErS spectra concatenation for precise bacteria classifications with few samples using a residual neural network

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Chinese Chemical Letters 2025年第1期36卷 484-490页

作者： Feihu Wu Gengwen Chen Kaitao Lai Shiqing Zhang Yingchao Liu ruijian Luo Xiaocong Wang Pinzhi Cao Yi Ye Jiarong Lian Junle Qu Zhigang Yang Xiaojun Peng Shenzhen Key Laboratory of Photonics and Biophotonics&College of Physics and Optoelectronic Engineering Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong ProvinceShenzhen UniversityShenzhen 518060China Hematology Reagent R&D department Mindray Bio-medical Electronics Co.LTD.Shenzhen 518107China State Key Laboratory of Fine Chemicals College of Material Science and EngineeringShenzhen UniversityShenzhen 518060China

deep learning neural network incorporating surface enhancement raman scattering technique(SErS)is becoming as a powerful tool for the precise classifications and diagnosis of bacterial ***,the large amount of sample requirement and time-consuming sample collection severely hinder its *** herein propose a spectral concatenation strategy for residual neural network using nonspecific and specific SErS spectra for the training data augmentation,which is accessible to acquiring larger training dataset with same number of SErS spectra or same size of training dataset with fewer SErS spectra,compared with pure non-specific SErS *** this strategy,the training loss exhibit rapid convergence,and an average accuracy up to 100%in bacteria classifications was achieved with50 SErS spectra for each kind of bacterium;even reduced to 20 SErS spectra per kind of bacterium,classification accuracy is still>95%,demonstrating marked advantage over the results without spectra *** method can markedly improve the classification accuracy under fewer samples and reduce the data collection workload,and can evidently enhance the performance when used in different machine learning models with high generalization ***,this strategy is beneficial for rapid and accurate bacteria classifications with residual neural network.

关键词： SErS deep learning resnet Bacteria classification Spectra concatenation

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control, Modeling and Stability Analysis of drU-based Grid-forming Converter

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Chinese Journal of Electrical Engineering 2025年第1期11卷 83-92页

作者： Wencong Wu Minzhi Wang Liang Tu Haiqing Cai Guanglei Yan Xiaohui Qu Haohan Gu Wei Chen State Key Laboratory of HVDC China Southern Power GridGuangzhou 510663China National Energy Power Grid Technology R&D Center Guangzhou 510663China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power Systems China Southern Power GridGuangzhou 510663China CSG Key Laboratory for Power System Simulation China Southern Power GridGuangzhou 510663China School of Electrical Engineering Southeast UniversityNanjing 210096China

diode rectifier unit(drU)-based high-voltage direct current(HVdC)transmissionsystems areeffectivein achieving the stableandeconomical operation of offshore *** theuncontrollable characteristicsof drUs,a grid-forming(GFM)strategy forwind-turbine converters isnecessary to support offshore AC voltageand ***,the active power-synchronization control in traditional GFM converters is unsuitable for drU-based GFM ***,the stability issue for drU-based HVdC systems involving drU-based GFM and grid-following(GFL)converters has not yet been *** solve these issues,this study begins with the characteristics of a drU-based HVdC system and presents a control scheme for drU-based GFM converters for power ***,the dq-frame impedance model of the drU-based GFM converteris proposed for the stability analysis of the entire HVdC ***,a simulation platform is built to verify the model accuracy and system stability.

关键词： diode rectifier unit offshore wind-powergeneration grid-forming converter impedance model stabilityanalysis

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Multiple Affine Model in Predictive control of a Nonlinear dynamic System

Multiple Affine Model in Predictive Control of a Nonlinear D...

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2024 IEEE International Conference on Advanced systems and Emergent Technologies, IC_ASET 2024

作者： Mezrigui, Houda Chagra, Wassila Hariz, Maher Ben University Tunis El Manar National Engineering School of Tunis R11ES20 Analysis Conception and Control of Systems Laboratory Tunis 1002 Tunisia Institut Préparatoire Aux Etudes d'Ingénieurs d'El Manar Tunisia

ISBN: (纸本)9798350384895

In this paper, it is presented a comparative view between Nonlinear Model Predictive control (NMPC) and Linear Model Predictive control (LMPC) applied to Multiple Affine Models (MAM) for a nonlinear dynamic system. Therefore, two MPC strategies are employed. In the NMPC scheme, three local optimization methods are used. Two gradient based ones that are Interior Point and Trust region. The third is the Nelder Mead method which is stochastic. The comparison is realized through simulations on a delayed nonlinear system. It highlights tracking performances attained by each strategy in terms of stability, speed and accuracy. In addition, the comparison concerns the computing times of the optimal control. The LMPC scheme applied to MAM achieves best tracking performances and much lower computing time. © 2024 IEEE.

关键词： Model predictive control

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Inverse design of quasi-bound states in the continuum metasurface for the polarization independent enhancement of Goos-H?nchen shift

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Science China(Physics,Mechanics & Astronomy) 2024年第12期67卷 79-86页

作者： Zuhai Ma Youzhi Shi Yu Chen Yu Xue Gan Wan Chi Zhang Hui Jing Le-Man Kuang Xinxing Zhou Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education School of Physics and ElectronicsHunan Normal UniversityChangsha 410081China International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology Engineering Technology Research Center for 2D Material Information Function Devices and Systems of Guangdong ProvinceInstitute of Microscale OptoelectronicsShenzhen UniversityShenzhen 518060China Key Laboratory of Physics and Devices in Post-Moore Era College of Hunan ProvinceChangsha 410081China Academy for Quantum Science and Technology Zhengzhou University of Light IndustryZhengzhou 450002China Institute of Interdisciplinary Studies Hunan Normal UniversityChangsha 410081China

Bound states in the continuum(BIC)have been widely researched and applied in optics due to their unique electromagnetic ***,there are still difficulties in predicting and customizing BIC *** address this issue,we design an efficient combined neural network for highly accurate prediction of quasi-bound states in the continuum(q-BIC)spectrum,as well as for the inverse design of the polarization independent enhancement of the Goos-H?nchen(GH)***,we propose a C_(4)symmetric metasurface for achieving q-BIC spectrum and providing the condition of enhanced GH *** employing a combined neural network,the intensity,position,shape,and phase of q-BIC spectrum with ultra-narrow resonance can be accurately predicted and on-demand customized,even under a small ***,we develop a screening algorithm for the q-BIC spectrum to quickly realize the polarization independent enhancement of GH *** an application,an ultra-high sensitivity refractive index sensor has been proposed,whose sensitivity can reach 2.31×10~7μm/rIU for TM polarization and 1.03×10~6μm/rIU for TE ***,this work brings new solutions for quick prediction of q-BIC spectrum and the development of flexible polarization photonic devices.

关键词： Goos-Hanchen shift bound states in the continuum deep learning

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Joint Task Offloading and Computation in a Multi-Carrier Multi-relay MEC System 4th

Joint Task Offloading and Computation in a Multi-Carrier Mul...

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4th International Conference on Frontiers of electronics, Information and Computation Technologies, ICFEICT 2024

作者： Zhang, Siyu Zhang, Yuexia Li, Junjie Zheng, Hui Zhang, Changyong Zhang, ruichang Li, Zhili Key Laboratory of Information and Communication Systems Beijing Information Science and Technology University Beijing China Key Laboratory of Modern Measurement and Control Technology Beijing Information Science and Technology University Beijing China Datang Microelectronics Technology Company Ltd Beijing China R&D Cente Beijing Smartchip Microelectronics Technology Co. Ltd Beijing China

ISBN: (纸本)9789819653133

As the continuous emergence of new applications, such as face recognition and automatic driving, wireless devices are faced with problems, for instance, limited computing resources and excessive energy consumption. Thus, this study presents a joint task offloading and computation algorithm for multi-carrier and multi-relay mobile edge computing (MEC) systems to resolve aforementioned problems. First, we build a multi-carrier and multi-relay MEC system. Next, we calculate the delay constraints according to the given tasks, optimize resource allocation. To optimize the total energy consumed of relays and users, the optimization of resource allocation is expressed as a mixed integer programming problem. Further, because difficulty in solving the issue, we use continuous relaxation and algebraic transformation to convert the problem to equivalent problem. Finally, we solve the problem utilizing the interior point method, which realizing the highly efficient resource allocation. Simulation results demonstrated that the presented joint collaborative task offloading and computing program decreases energy consumed by 26.67% compared with the relay-only assisted task computing program. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2025.

关键词： Integer programming

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design of 1.5-6 GHz High Efficiency 50W Power Amplifier design for sub 6-GHz 5G systems 30

Design of 1.5-6 GHz High Efficiency 50W Power Amplifier Desi...

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30th IEEE International Conference on electronics, Circuits and systems, ICECS 2023

作者： Çaǧdas, Engin Kizilbey, Oǧuzhan Yazgi, Metin Palamutçuoǧullari, Osman Tübitak Bilgem Yital Semiconductor Test and Research Laboratory Kocaeli Turkey R&D Support and Information Systems TUBITAK National Metrology Institute Kocaeli Turkey Istanbul Technical University Electrical and Electronics Engineering Faculty Istanbul Turkey

ISBN: (纸本)9798350326499

This paper presents the design of a Gallium Nitride (GaN) transistor based power amplifier (PA) with 50W (47 dBm) output power operating in the 1.5-6 GHz frequency range for 5G base stations. In this study, to avoid a gain-bandwidth trade-off by using a single 50W transistor, two 25W transistors are used and combined at the output. A wideband (1.5-6 GHz) 2-way Wilkinson power divider/combiner is designed to drive the 25W transistors by dividing the input power in half and combining the 25W power at the output. Cree CGHV1F025S model GaN transistor and rogers rT5870 model substrate are used in the design. The performance of the designed 25W PA is evaluated by simulations. According to the simulation results, the 25W PA offers 9.5 dB power gain, 43.6 dBm output power and power added efficiency (PAE) between 42% and 55% in the 1.5-6 GHz band. By combining the output of two 25W PAs with the designed 2-way WPd, an output power of 46.3-47.1 dBm is obtained across the band. © 2023 IEEE.

关键词： Power amplifiers

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Field stabilization of pulse duration in a hundredfemtosecond level

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Chinese Optics Letters 2024年第8期22卷 93-99页

作者： runmin Liu Yong Wu Guoqing Pu Jiayang Cheng Huan Mu Bowen Liu Lilin Yi Minglie Hu Ultrafast Laser Laboratory Key Laboratory of Opto-electronic Information Science and Technology of Ministry of EducationSchool of Precision Instruments and Opto-electronics EngineeringTianjin UniversityTianjin 300072China State Key Laboratory of Advanced Communication Systems and Networks School of Electronic Information and Electrical EngineeringShanghai Jiao Tong UniversityShanghai 200240China R&D Center AIOPTICS Company LimitedShanghai 200240China

Pulse duration is considered as one of the most important characteristics of high-power femtosecond ***,pulses output from the laser system are susceptible to ambient changes and manifest the instability of pulse durations in an open *** this paper,incorporating the algorithmic framework of the improved stochastic hill-climbing search and incremental proportional-integral controller,temperature-induced fluctuations of pulse duration can be effectively compensated by an automatic feedback control in an all-fiber chirped-pulse amplification *** the experiment,sub-hundred femtosecond fluctuation of pulse duration is introduced to verify the performance robustness of the proposed pulse-duration feedback control(PdFC).The stability of pulse duration is obviously higher than the case without the feedback control,and the peak-to-peak fluctuation of pulse duration is reduced to 6.5%.Furthermore,the robust switching between different pulse durations proves the versatility of the *** expect that the proposed feedback control method could provide a novel insight into high-power femtosecond lasers widely applied in fundamental researches and industrial fields.

关键词： fiber amplifier femtosecond laser pulse-duration feedback control

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design and Implementation of Telemedicine System Using Light Fidelity and PIC16F877A Microcontroller 14

Design and Implementation of Telemedicine System Using Light...

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14th International Conference on Information Science and Technology, ICIST 2024

作者： Ezilarasan, M.r. Leung, Man-Fai dai, Xiangguang Vel Tech Rangarajan Dr. Sagunthala R and D Instituteof Science and Technology Department of Electronics and Communication Engineering Chennai India School of Computing and Information Science Anglia Ruskin University Faculty of Science and Engineering Cambridge United Kingdom Information Processing and Control of Chongqing Municipal Institutions of Higher Education Chongqing Three Gorges University Key Laboratory of Intelligent Chongqing Wanzhou404100 China

ISBN: (纸本)9798350353334

Medical Body Area Networks (MBANs) increasingly utilize wireless communication technologies to enhance the freedom and convenience for patients and caregivers. Currently, radio frequency (rF) is the prevalent medium in healthcare applications;however, the potential for electromagnetic interference with precision medical equipment remains a concern. This study introduces a novel design and implementation of a medical healthcare information system using the newly developed Wireless Visible Light Communication (VLC) technology, also known as Light Fidelity (Li-Fi). Visible Light Emitting diodes (LEds), expected to soon surpass traditional incandescent and fluorescent bulbs as the primary light source due to their energy efficiency, facilitate this technology. In this research, patient health is monitored using sensors, with results displayed on an LCd. An LEd lightbulb transmits the data as light signals, which are captured by a photo-detector at the receiver's end. This setup not only displays the output on an LCd but also alerts caregivers through an auditory signal, beeping every 15 seconds for respiration and every 30 seconds for heart rate monitoring. Moreover, these lighting fixtures serve dual functions: illumination and wireless data transmission, using the rapid switching capability of LEds. This prototype VLC-based system offers a promising alternative for data services and monitoring in hospital areas where rF use is restricted. © 2024 IEEE.

关键词： Liquid crystal displays

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Vehicle-in-the-Loop Experimental Verification of real-Time Embedded Computation on Microcontroller for Service-Oriented Energy-Optimal Strategies of Intelligent Electric Vehicles

Vehicle-in-the-Loop Experimental Verification of Real-Time E...

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International Conference on Intelligent Transportation

作者： dohee Kim Youngwon Seo Hongsoon Jang Hyemin Kang Gu-Min Jeong Jeong Soo Eo Electrified Systems Control Research Laboratory R&D Division Hyundai Motor Company Republic of Korea Department of Electrical Engineering Kookmin University Republic of Korea R&D Division Commercial Electronic Control Development Team Hyundai Motor Company Republic of Korea

In this paper, a real-time energy-optimal strategy exploiting preview information resulting from connectivity and autonomous vehicle (CAV) technology is verified by experimental analyses linked with on-board computing methods on a real vehicle-in-the-loop testbed with virtual road and traffic light system. An energy-optimal deceleration planning/following system (EdPS) as a service-oriented technology for electrified vehicles utilizing preview information is applied to a micro-controller, where the data access route and location on the given system architecture are optimized to shorten computing time. Also, two types of multicore strategies are comparatively analyzed to efficiently operate computing resources of the embedded controller as well as to distribute computing loads, and the strategy comparisons indicate that a function-level task partition considering target cores in advance can practically reduce computing loads. In the vehicle-in-the-loop simulations (VILS) with a realistic driving on the virtual road and CAV technology-based information, the embedded EdPS planning results illustrate that the energy-optimal speed profiles are properly computed on a commercial automotive microcontroller while stably processing real-time data input/output and optimal planning within the given time constraints.

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