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Compact generation scheme of path–frequency hyperentangled photons using 2D periodical nonlinear photonic crystal

Chinese Physics B 2023年第12期32卷 256-262页

作者：陈洋河季波李念芹姜震李维李昱东冯梁森武腾飞何广强 SJTU Pinghu Institute of Intelligent Optoelectronics Department of Electronic EngineeringShanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronic EngineeringShanghai Jiao Tong UniversityShanghai 200240China Science and Technology on Metrology and Calibration Laboratory Changcheng Institute of Metrology&MeasurementAviation Industry Corporation of ChinaBeijing 100095China

Hyperentanglement is a promising resource for achieving high capacity quantum ***,we propose a compact scheme for the generation of path-frequency hyperentangled photon pairs via spontaneous parametric down-conversion(SPDC)processes,where six different paths and two different frequencies are covered.A two-dimensional periodicalχ^((2))nonlinear photonic crystal(NPC)is designed to satisfy type-Ⅰquasi-phase-matching conditions in the plane perpendicular to the incident pump beam,and a perfect phase match is achieved along the pump beam's direction to ensure high conversion efficiency,with theoretically estimated photon flux up to 2.068×10^(5) pairs·s^(-1)·mm^(-2).We theoretically calculate the joint-spectral amplitude(JSA)of the generated photon pair and perform Schmidt decomposition on it,where the resulting entropy S of entanglement and effective Schmidt rank K reach 3.2789 and 6.4675,*** hyperentangled photon source scheme could provide new avenues for high-dimensional quantum communication and high-speed quantum information processing.

关键词： hyperentanglement nonlinear photonic crystal quasi-phase-matching

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Integrated Communication and Topology Design for Cross-domain Collaboration between Space and Marine Robots 4

Integrated Communication and Topology Design for Cross-domai...

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4th International Conference on Electronic Information Engineering and Computer Communication, EIECC 2024

作者： Yu, Bo Zuo, Xiaozhong Gao, Sheng Shenyang Liming Aviation Parts Manufacturing Co. Ltd Shenyang110141 China Chinese Academy of Sciences State Key Laboratory of Robotics Shenyang Institute of Automation Shenyang110016 China China-Portugal Belt and Road Joint Laboratory on Space & Sea Technology Advanced Research Shanghai200120 China

ISBN: (纸本)9798331534622

To address the challenge of achieving efficient and flexible communication between space robots and marine robots during cross-domain collaboration tasks, a hybrid communication integration architecture that combines self-organizing networks and satellite internet is proposed to overcome communication barriers. First, the fundamental technologies of self-organizing networks and satellite internet communication, along with their characteristics, are analyzed in detail. Next, the design of the hybrid communication integration architecture is elaborated, focusing on intra-cluster communication, inter-cluster communication, and cooperative communication technologies in conjunction with the ground command center. simulation results validate the proposed architecture, demonstrating its capability to meet key performance metrics such as low communication delay, high throughput, and high reliability across various tasks. Finally, the potential optimizations and future research directions for this system are discussed, highlighting the need for improvements in real-world adaptability and scalability. © 2024 IEEE.

关键词： Marine communication

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Research on in situ generation mechanism and tribological properties of superhard high entropy ceramic coatings by high speed laser cladding

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Ceramics International 2025年

作者： Liu, Jin Shao, Qizhe Cui, Xiufang Jin, Guo Wen, Xin Shi, Taoyi Tian, Haoliang Institute of Surface/Interface Science and Technology Key Laboratory of Superlight Material and Surface Technology of Ministry of Education College of Materials Science and Chemical Engineering Harbin Engineering University Harbin150001 China Aviation Key Laboratory of Science and Technology on Advanced Corrosion and Protection for Aviation Materials AECC Beijing Institute of Aeronautical Materials Beijing100095 China

The superhard high entropy ceramics coating was prepared in situ on surface of titanium alloys by high speed laser cladding with ZrB2, TiB2, NbB2, MoB2, and TaB2 as the original powder. The composition and generation mechanism of phases of coating were analyzed. The results showed that two phases were generated in situ during high speed laser cladding. On the one hand, the in situ reaction between melted ceramic powder and Ti element generated a high entropy monoboride ceramic (Zr, Ti, Nb, Mo, Ta)B with CrB-like structure. On the other hand, the substitution reaction between melted ceramic powders generated high entropy diborides (Zr, Ti, Nb, Mo, Ta)B2 with hexagonal structure. The coating exhibited high hardness (1931.4 HV0.5) and excellent tribological properties. The abrasive and adhesive wear phenomena of the coating are significantly reduced compared to the substrate, and the wear rate of the coating is less than 1/5 of that of the *** is attributed to dense microstructure and significant lattice distortion effect of the high entropy material. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Titanium alloys

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Shear induced deformation twinning evolution in thermoelectric InSb

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npj Computational Materials 2021年第1期7卷 1008-1016页

作者： Zhongtao Lu Ben Huang Guodong Li Xiaolian Zhang Qi An Bo Duan Pengcheng Zhai Qingjie Zhang William A.Goddard III Hubei Key Laboratory of Theory and Application of Advanced Materials Mechanics School of ScienceWuhan University of TechnologyWuhanPR China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhanPR China Department of Chemical and Materials Engineering University of Nevada RenoRenoNVUSA Materials and Process Simulation Center California Institute of TechnologyPasadenaCAUSA

Twin boundary(TB)engineering has been widely applied to enhance the strength and plasticity of metals and alloys,but is rarely adopted in thermoelectric(TE)*** previous first-principles results showed that nanotwins can strengthen TE Indium Antimony(InSb)through In–Sb covalent bond rearrangement at the ***,we further show that shear-induced deformation twinning enhances plasticity of *** demonstrate this by employing large-scale molecular dynamics(MD)to follow the shear stress response of flawless single-crystal InSb along various slip *** observed that the maximum shear strain for the (111)[112] slip system can be up to 0.85 due to shear-induced deformation *** attribute this deformation twinning to the“catching bond”involving breaking and re-formation of In–Sb bond in *** finding opens up a strategy to increase the plasticity of TE InSb by deformation twinning,which is expected to be implemented in other isotypicⅢ–V semiconductors with zinc blende structure.

关键词： deformation plasticity Shear

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Optimal Controller Design for Non-Affine Nonlinear Power Systems with Static Var Compensators for Hybrid UAVs

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Tsinghua Science and technology 2022年第1期27卷 196-206页

作者： Yanchu Li Qingqing Ding Shufang Li Stanimir Valtchev Beijing Key Laboratory of Network System Architecture and Convergence Beijing Laboratory of Advanced Information Networkand School of Information&Communication EngineeringBeijing University of Posts and TelecommunicationsBeijing 100876China State Key Laboratory of Control and Simulation of Power System and Generation Equipments Tsinghua UniversityBeijing 100084China the Nova School of Science and Technology(FCT/UNL) Caparica 2829-516LisbonPortugal Technical University of Sofia(TUS) Sofia 2125Bulgaria

A generalized non-affine nonlinear power system model is presented for a single machine bus power system with a Static Var Compensator(SVC)or State Var System(SVS)for hybrid Unmanned Aerial Vehicles(UAVs).The model is constructed by differential algebraic equations on the MATLAB-Simulink platform with the programming technique of its *** the inverse system method and the Linear Quadratic Regulation(LQR),an optimized SVC controller is *** simulations under three fault conditions show that the proposed controller can effectively improve the power system transient performance.

关键词： Static Var Compensator(SVC) Unmanned Aerial Vehicles(UAV) power system non-affine nonlinear control inverse system method Linear Quadratic Regulation(LQR)

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Effect of Oblique Laser Shock Peening on Fretting Fatigue of FGH95 Powder Superalloy 6

Effect of Oblique Laser Shock Peening on Fretting Fatigue of...

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2024 6th International Conference on advanced Materials and Ecological Environment, AMEE 2024

作者： Qu, Xiangming Wang, Wenjun Zhao, Yanyun Cao, Jun Zhu, Haiyan Guo, Xiaojun Wang, Xu Zhang, Yongkang College of Mechanical Engineering Hunan Institute of Science and Technology Yueyang Hunan China Guangdong Provincial Key Laboratory of Advanced Manufacturing Technology of Marine Energy Equipment Guangdong University of Technology Guangdong Guangzhou China Foshan Yuantian Mattress Machinery Co. Ltd Guangdong Foshan China AECC Hunan Aviation Powerplant Research Institute Hunan Zhuzhou China

Due to the high-frequency vibration contact of blade tenon, the contact surface of the mortise surface of the turbine disk is prone to fretting wear and fatigue fracture. The effects of shock times of Oblique Laser Shock Peening (LSP) and temperature on the fretting fatigue properties were studied. The fretting fatigue life of Oblique LSP treated samples at room temperature could be increased by 103.0%;At high temperatures, the fretting fatigue life could be increased by 68.5%. Through the analysis of fracture morphology, the fracture developing zone of fretting fatigue and tensile fatigue samples were compared. It is revealed that the wear in the transverse contact pads would promote the initiation of fatigue cracks;Due to the compressive force of the transverse contact pads, the degree of plastic deformation of the fretting specimens would increase, the quasi-cleavage facets appeared, and the tear ridge characteristics were obvious. The results of this paper provide a reference for the Oblique LSP of the FGH95 powder superalloy turbine disk and other aero-engine parts. © Published under licence by IOP Publishing Ltd.

关键词： Fracture

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Efficient and selective recovery of Gd(Ⅲ)via polyethyleneimine modification of lanthanum-based metal-organic frameworks

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Journal of Rare Earths 2024年第1期42卷 210-219,I0007页

作者： Wenhao Li Lijinhong Huang Bin Xiao Xiaoguang Duan Haike Li Lang Li Wanfu Huang Ganzhou Key Laboratory of Basin Pollution Simulation and Control Jiangxi University of Science and TechnologyGanzhou341000China Innovation Center for Water Quality Security Technology at Ganjiang River Basin Jiangxi University of Science and TechnologyGanzhou341000China Faculty of Science and Engineering WA School of Mines:MineralsEnergy and Chemical EngineeringCurtin UniversityWAAustralia School of Architecture and Design Jiangxi University of Science and TechnologyGanzhou341000China School of Resources and Architectural Engineering Gannan University of Science and TechnologyGanzhou341000China School of Chemical Engineering and Advanced Materials The University of AdelaideAdelaideSA5005Australia School of Resource and Environmental Engineering Jiangxi University of Science and TechnologyGanzhou341000China

With the development of the economy and the increasing demand for environmental protection,the efficient and selective recovery of Gd(Ⅲ)from actual wastewater is of critical *** this work,lanthanum-based metal-organic framework(LaBDC)materials were prepared by a hydrothermal method,and then polyethyleneimine(PEI)and LaBDC were combined by an impregnation method to form a novel LaBDC@xPEI *** prepared materials were characterized using Fourier transfo rm infrared spectroscopy(FTIR),X-ray diffraction(XRD),scanning electron microscopy(SEM),energy dispersive X-ray spectroscopy(EDX),B runauer-Emmett-Teller(BET),thermogravimetric analysis(TGA)and X-ray photoelectron spectroscopy(XPS).Experiments show that LaBDC@50%PEI has the highest adsorption capacity(181.77 mg/g)among lanthanum-based MOFs with different PEI loadings at pH=5.5,which is about 5.1 times that of bare *** adsorption isotherm analysis shows that LaBDC@50%PEI follows the Langmuir *** addition,the adsorption kinetics of LaBDC@50%PEI follows a pseudo-second-order kinetic model,indicating that the adsorption process is chemical *** is worth noting that LaBDC@50%PEI maintains good adsorption performance and stability after three recycling tests,and exhibits excellent selectivity in cation interference ***,the LaBDC@50%PEI composites possess good stability and hold great promises in rapid recovery of Gd(Ⅲ)from practical aqueous environments.

关键词： Wet-impregnation method Polyethylene imine Metaleorganic frameworks Lanthanum Recovery of Gd(Ⅲ) Rare earths

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Analysis and Improvement of the AC-Voltage Control of GFM MMC to Improve the Voltage Stability of AC/DC Hybrid Power Grid 14

Analysis and Improvement of the AC-Voltage Control of GFM MM...

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14th IEEE International Symposium on Power Electronics for Distributed Generation Systems, PEDG 2023

作者： Chi, Chengbin Liu, Shan Liu, Qi Li, Fan State Grid Smart Grid Research Institute Co. Ltd State Key Laboratory of Advanced Power Transmission Technology Beijing China State Grid Smart Grid Research Institute Co. Ltd Beijing Key Laboratory of DC Grid Technology and Simulation Beijing China State Grid Shanghai Municipal Electric Power Company Shanghai China

ISBN: (纸本)9798350328233

The grid-forming control is regarded as an effective solution for grid-tied converters to operate under weak grid conditions. Currently, most of the grid-forming control strategies are designed for 2-level voltage source converters. The Power loop-AC voltage loop-AC current loop control is usually adopted in these strategies. This control structure highly relies on the AC side filter capacitor. However, in high-voltage situations, the modular multilevel converter, which has no AC side filter capacitor, is commonly adopted. The integral effect of the filter capacitor in the original control path is replaced by the differential effect of the grid impedance, which worsens the performance of AC voltage control. To solve this problem, the steady-state model of MMC using grid-forming control is established. Based on this model, two improved AC-voltage control strategies are proposed in this paper. simulation results in PSCAD/EMTDC show that the proposed control realizes desired dynamic control of the DC voltage. © 2023 IEEE.

关键词： Voltage control

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A simulation and Test Method for Fault Current Suppression Branch in DC Grid

A Simulation and Test Method for Fault Current Suppression B...

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International Conference on Electronics technology (ICET)

作者： Fangyuan Li Huaiguang Gu Jiapei Zhou Yang Gao State Key Laboratory of Advanced Power Transmission Technology Beijing Key Laboratory of DC Grid Technology & Simulation State Grid Smart Grid Research Institute CO.LTD. Beijing China

ISBN: (数字)9798350363951

ISBN: (纸本)9798350363968

This paper is aimed at the research and verification requirements of fault current suppression devices applied in DC grids as actual physical test equipment. A joint test method based on digital and physical hybrid simulation is proposed, and a digital physical interface scheme is provided. It has engineering practical digital physical interface stability and accuracy, and plays a technical support role in the development of fault current suppression devices in DC grids. A fault current suppression branch is proposed for the combination of a current limiter and a high-voltage DC circuit breaker. The testing topology, main circuit interface, communication interface, and communication protocol requirements for the digital physical hybrid simulation of the fault suppression branch are proposed, and a platform for the connection of the current limiting device is developed. The experiment results show that after adding a current limiter to the current limiting branch, the maximum fault current decreases, the breaking current of the circuit breaker is reduced, and the requirements for the technical parameters of the circuit breaker are lowered.

关键词： Low voltage Limiting Protocols Circuit breakers Power system dynamics Power grids Topology

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Research on simulation Modeling Method of New Distributing Network with Large Scale Distributed Energy Sources

Research on Simulation Modeling Method of New Distributing N...

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2023 International Conference on Power System technology, PowerCon 2023

作者： Gu, Huaiguang Kou, Longze Zhu, Lin Gao, Yuqin Gao, Yang Xiong, Ping State Key Laboratory of Advanced Transmission Technology China Beijing Key Laboratory of Dc Power Grid Technology and Simulation China State Grid Smart Grid Research Institute Co. LTD. Changping Beijing102209 China State Grid Hubei Electric Power Research Institute Hongshan District Hubei Province Wuhan City430015 China

ISBN: (纸本)9798350300222

In this paper, a distribution network model with distributed power supply is built. Firstly, the current situation of new energy power generation under the background of carbon neutralization is introduced in the overview. The models of fans, photovoltaic and hybrid energy storage are established respectively, and the corresponding control methods such as maximum power tracking, constant power control, bus voltage control and so on are described in detail. On this basis, the distribution network modeling of photovoltaic energy storage intermodal transportation is completed;Each simulation model is shown. © 2023 IEEE.

关键词： Electric power distribution

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