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A simple fabrication method of germanium-based metasurfaces

Chinese Optics Letters 2024年第7期22卷 117-120页

作者： Dongzhi Shan Jinsong Gao Nianxi Xu Naitao Song Hongda Wei Qiang Li Yi Zhao Hai Liu Qiao Sun Xiaonan Jiang Chao Li Zhiyu Zhang Key Laboratory of Optical System Advanced Manufacturing Technology Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China State Key Laboratory of Applied Optics Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China Jilin Provincial Key Laboratory of Advanced Optoelectronic Equipment and Instrument Manufacturing Technology Changchun 130033China

In this work,a simple fabrication method of germanium-based metasurfaces is proposed,where the deposited Al_(2)O_(3) layer with high selectivity is chosen as the hard mask and retained after the dry etching *** simulation and experimental characterization results verify the feasibility of the fabrication *** experimental study on the fabrication methods of germanium-based metasurfaces is very significant as the meta-atoms with a higher refractive index can achieve 0 to 2πtransmission phase variation with a smaller period under the same thickness-to-period ratio,which is consistent with the requirement of the period miniaturization in some cases.

关键词： metasurfaces period miniaturization refractive index

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Design and Control for WLR-3P:A Hydraulic Wheel-Legged robot

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Cyborg and Bionic systems 2023年第1期4卷 243-259页

作者： Xu Li Haoyang Yu Haibo Feng Songyuan Zhang Yili Fu State Key Laboratory of Robotics and System College of Mechatronics EngineeringHarbin Institute of TechnologyHarbin 150001China State Key Laboratory of Fluid Power and Mechatronic Systems Zhejiang UniversityHangzhou 310027China Intelligent Robot Research Center Zhejiang LaboratoryHangzhou 311100China

The robot used for disaster rescue or field exploration requires the ability of fast moving on flat road and adaptability on complex *** hybrid wheel-legged robot(WLR-3P,prototype of the third-generation hydraulic wheel-legged robot)has the characteristics of fast and efficient mobility on flat surfaces and high environmental adaptability on rough *** this paper,3 design requirements are proposed to improve the mobility and environmental adaptability of the *** meet these 3 requirements,2 design principles for each requirement are put ***,for light weight and low inertia with high stiffness,3-dimensional printing technology and lightweight material are ***,the integrated hydraulically driven unit is used for high power density and fast response ***,the microhydraulic power unit achieves power autonomy,adopting the hoseless design to strengthen the reliability of the hydraulic *** is more,the control system including hierarchical distributed electrical system and control strategy is *** mobility and adaptability of WLR-3P are demonstrated with a series of ***,the robot can achieve a speed of 13.6 km/h and a jumping height of 0.2 m.

关键词： robot robot terrain

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Net 206-Gb/s Carrier-Aided Intensity Modulation Direct Detection without Power Fading

Net 206-Gb/s Carrier-Aided Intensity Modulation Direct Detec...

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OptoElectronics and Communications Conference, OECC

作者： Yimin Hu Yixiao Zhu Xiansong Fang Guangying Yang Weisheng Hu Fan Zhang State Key Laboratory of Advanced Optical Communication System and Networks Shanghai Jiao Tong University Shanghai China State Key Laboratory of Advanced Optical Communication System and Networks School of Electronics Peking University Beijing China State Key Laboratory of Advanced Optical Communication System and Networks School of Electronics Shanghai Jiao Tong University Shanghai China Pengcheng Laboratory Shenzhen China

We propose and experimentally demonstrate low-cost carrier-aided IM-DD scheme to overcome dispersion-induced power fading. With Kramers-Kronig and residual carrier-based recovery, SSBI and MHz laser phase noise are mi... 详细信息

ISBN: (数字)9798350308396

ISBN: (纸本)9798350308402

关键词： Fading channels Phase noise Optical fibers Laser noise Interference Optical fiber networks Intensity modulation Optical noise Optical fiber dispersion Fiber lasers

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Efficient and Ultra-Low-Complexity Inter-Channel Nonlinearity Mitigation Based on Residual Carrier for PS-256-QAM WDM Transmission

Efficient and Ultra-Low-Complexity Inter-Channel Nonlinearit...

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OptoElectronics and Communications Conference, OECC

作者： Yixiao Zhu Xiansong Fang Jiayu Zheng Ziheng Zhang Weisheng Hu Fan Zhang State Key Laboratory of Advanced Optical Communication System and Networks Shanghai Jiao Tong University Shanghai China State Key Laboratory of Advanced Optical Communication System and Networks School of Electronics Peking University Beijing China State Key Laboratory of Advanced Optical Communication System and Networks School of Electronics Shanghai Jiao Tong University Shanghai China Pengcheng Laboratory Shenzhen China

We propose and experimentally demonstrate an efficient and ultra-low-complexity inter-channel nonlinearity mitigation using residual carrier-based phase tracking. Without information of neighboring channels, 1.4-dB Q ... 详细信息

ISBN: (数字)9798350308396

ISBN: (纸本)9798350308402

关键词： Q measurement Power measurement Spectral efficiency Prevention and mitigation Optical switches Optical variables measurement Optical fiber networks Wavelength division multiplexing Probes Standards

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Circuit Model with Current Interruption for Hybrid High Voltage DC Circuit Breakers to Achieve Precise Current Experiments

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CSEE Journal of Power and Energy systems 2022年第4期8卷 1250-1260页

作者： Zhonghao Dongye Lei Qi Bing Ji Xiaoguang Wei Xiang Cui State Key Laboratory of Altermate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijing 102206China School of Engineering University of LeicesterLE17RH LeicesterU.K State Key Laboratory of Advanced Power Transmission Technology Global Energy Interconection Research Institute Co.Ld.Beijing 102209China

The current interruption test based on an LC resonance circuit for hybrid DC circuit breakers(HVDC CBs)is widely employed to characterize the current interruption capability of *** order to ensure a high-fidelity replica of the fault current in a high voltage application,this paper first proposes an equivalent model of the test circuit,where not only parasitic resistances but also the threshold voltages and on-state resistances of various semiconductor devices are ***,the analytical formula of the test current is derived by including the working principle of the HVDC ***,the parameter extraction method,which combines finite element analysis and measurements by an impedance analyzer,is given in this *** extracted result implies that,in current interruption transients,equivalent resistances of 500 kV CB are as large as 535 mS,which have a significant influence on current ***,the 34 kV/25 kA current interruption test for the 500 kV CB is *** measured results are proved to be consistent with the analytical results obtained from the proposed model,and the relative error is less than 2%.

关键词： Current interruption test high voltage DC circuit breaker

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An optimized control switching strategy for STATCOM/BESS reactive power output

An optimized control switching strategy for STATCOM/BESS rea...

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2023 International Conference on Automation Control, Algorithm, and Intelligent Bionics, ACAIB 2023

作者： Wu, Na Zhao, Chengyong Yu, Hongyang Yang, Zhichang Liu, Xiaoge State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University China State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd. Changping District Beijing102209 China

ISBN: (纸本)9781510667662

In recent years, STATCOM/BESS (Static Synchronous Compensator/Battery Energy Storage system) has received widespread attention due to its superior power four-quadrant output characteristics. To address the problem of delayed reactive power withdrawal and voltage fluctuations in compensating traditional DC transmission under large disturbances, a fast and effective outer-loop control switching strategy has been proposed. Under small disturbances, a constant bus voltage control method based on PI control is adopted to provide real-time and complete compensation of the receiving-end voltage, maintaining the receiving-end bus voltage at the rated value. Under large disturbances, the control mode is switched to open-loop control with constant reactive power, without the delay of the PI loop, enabling timely withdrawal of reactive power upon fault clearance and ensuring stable receiving-end voltage. The proposed control strategy was verified by simulation on the PSCAD/EMTDC platform, demonstrating its feasibility and effectiveness. © 2023 SPIE.

关键词： Static synchronous compensators

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Effect of Electrothermal Aging on Dielectric Properties of Polypropylene Films for Capacitors

Effect of Electrothermal Aging on Dielectric Properties of P...

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2023 IEEE International Conference on Applied Superconductivity and Electromagnetic Devices, ASEMD 2023

作者： Xing, Zhaoliang Hao, Jianhong North China Electric Power University State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources Beijing102206 China State Grid Smart Grid Research Institute Co. Ltd. State Key Laboratory of Advanced Power Transmission Technology Beijing102209 China

ISBN: (纸本)9798350301571

At present, there is still a gap between domestic BOPP films and imported products in terms of long-term thermal stability. In order to systematically study the difference in long-term thermal stability between domestic and imported BOPP films, BOPP films with different particles and different drawing processes at home and abroad were selected as the research object, and 240h electrothermal aging test was carried out at 120 and 20kV/mm. The electrical properties of four BOPP films before and after electrothermal aging were analyzed by DC breakdown and conductance tests. Compared with the imported BOPP film, the domestic film isoptric, crystallinity is lower, the intermolecular chain force is weak, under the action of long-term thermal aging, the conductivity of domestic and foreign films has increased, the breakdown field strength has decreased, but compared with the domestic film, the stronger intermolecular chain force in the imported film, the trap density in polypropylene is reduced, so that it has better long-term thermal stability. © 2023 IEEE.

关键词： ash content breakdown strength isotacticity Polypropylene

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Correction Algorithm of Doppler Effect on the Comb-Based FSO-TWTFT for Satellite Application

Correction Algorithm of Doppler Effect on the Comb-Based FSO...

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2023 Joint Conference of the European Frequency and Time Forum and IEEE International Frequency Control Symposium, EFTF/IFCS 2023

作者： Wang, Long Jiao, Wenhai Hu, Liang Chen, Jianping Wu, Guiling Shanghai Jiao Tong University State Key Laboratory of Advanced Optical Communication System and Networks Department of Electronic Engineering China Beijing Institute of Tracking and Telecommunication Technology Beijing China

We further analyze the Doppler effect caused by high-velocity platform motion for the comb-based free-space optical two-way time-frequency transfer technique. A novel synchronization algorithm is proposed to correct t... 详细信息

ISBN: (纸本)9798350311426

关键词： Doppler effect optical frequency comb transfer satellite motion

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Two-color emissive AIEgens with anti-Kasha property for dual-organelle imaging and phototherapy

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Science China Chemistry 2024年第5期67卷 1740-1752页

作者： Pu Chen Guogang Shan Qingli Nie Yuting Yan Pengfei Zhang Zujin Zhao Hai-Tao Feng Ben Zhong Tang AIE Research Center Shaanxi Key Laboratory of PhytochemistryCollege of Chemistry and Chemical EngineeringBaoji University of Arts and SciencesBaoji 721013China Institute of Functional Material Chemistry and National&Local United Engineering Lab for Power Battery Faculty of ChemistryNortheast Normal UniversityChangchun 130024China College of Chemistry&Materials Science Northwest UniversityXi’an 710127China Guangdong Key Laboratory of Nanomedicine CAS-HK Joint Lab of BiomaterialsCAS Key Laboratory of Biomedical Imaging Science and SystemShenzhen Engineering Laboratory of Nanomedicine and NanoformulationsCAS Key Lab for Health InformaticsShenzhen Institutes of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China State Key Laboratory of Luminescent Materials and Devices Key Laboratory of Luminescence from Molecular Aggregates of Guangdong ProvinceSouth China University of TechnologyGuangzhou 510640China School of Science and Engineering Shenzhen Institute of Aggregate Science and TechnologyThe Chinese University of Hong KongShenzhen(CUHK-Shenzhen)Shenzhen 518172China

Despite the rapid development of probes for targeting single organelle, the construction of robust dual-organelle targeting probes with multicolor emission was rarely reported. Herein, two dual-emissive aggregation-induced emission luminogens(AIEgens)with donor-π-acceptor structures were designed and synthesized, namely QT-1 and QF-2. Both two AIEgens exhibited excitation wavelength-dependence defying the Kasha's rule, and could stain lipid droplets(LDs) and mitochondria in blue and red fluorescence, respectively. Moreover, thanks to the near-infrared emission and abundant reactive oxygen species(ROS) generation efficiency of QT-1, it was chosen as a photodynamic therapy agent to selectively kill cancer cells from normal cells. Upon light irradiation, an obvious decrease of mitochondrial membrane potential(MMP) and serious change of mitochondrial shape in cells were observed, which corresponded to the efficient inhibition of tumor growth in vivo. This work afforded a promising strategy for the construction of multicolor emission by tuning anti-Kasha behaviors and expanding their application in dualorganelle targeting-based phototheranostics.

关键词： aggregation-induced emission anti-Kasha luminescence fluorescent probe bioimaging photodynamic therapy

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Influence of thermal ageing on high-field polarisation characteristics and conductivity behaviour of submarine polymeric cables insulation

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High Voltage 2023年第1期8卷 138-148页

作者： Xize Dai Jian Hao Gian Carlo Montanari Zheng Jian Ruijin Liao Xinlong Zheng State Key Laboratory of Power Transmission Equipment&System Security and New Technology Chongqing UniversityChongqingChina Department of Energy Aalborg UniversityAalborgDenmark Center for Advanced Power Systems Florida State UniversityTallahasseeFloridaUSA Shinan Power Supply Branch Company of State Grid Chongqing Electric Power Company NananChina Zhoushan Power Supply Branch Company of State Grid Zhejiang Electric Power Company ZhoushanChina

Diagnosing insulation intrinsic ageing is essential for preventing insulation failure of submarine cables,and in case of failure,helping in any decision about maintenance *** this study,a novel aged cable diagnosis approach based on high-voltage frequency domain spectroscopy(HV-FDS)with broader frequency width is proposed to analyse the high-field polarisation characteristics and conductivity behaviour of 500 kV submarine polymeric cables insulation,aiming to support the evaluation of overall insulation *** measurement principle of HV-FDS and relaxation mechanism are stated,and then focus is on studying the extent of change of polarisation and conduction properties of submarine cables insulation as a function of ageing stress and ***,the high-field polarisation characteristics and conductivity behaviour are discussed in-depth based on the carrier transport and trap ***,the novel diagnostic indicator based on the high-field characteristics is extracted to quantify the thermal ageing state of submarine cables *** show that the high-field polarisation characteristics and conductivity behaviour seem to become sensitive diagnostic quantities if measured at reasonably high voltage,which are able to reveal mechanisms associated with thermo-oxidative ageing as that generated in the testing procedure considered in this *** is considerably higher than that experienced in typical dielectric spectroscopy approaches.

关键词： behaviour insulation characteristics

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