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A compact multi-pixel superconducting nanowire single-photon detector array supporting gigabit space-to-ground communications

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Light(Science & Applications) 2024年第2期13卷 254-266页

作者： Hao Hao Qing-Yuan Zhao Yang-Hui Huang Jie Deng Fan Yang Sai-Ying Ru Zhen Liu Chao Wan Hao Liu Zhi-Jian Li Hua-Bing wang Xue-Cou Tu La-Bao Zhang Xiao-Qing Jia Xing-Long Wu Jian Chen {1. Kang Pei-Heng Wu Research Institute of Superconductor electronics(RISE) School of Electronic Science and EngineeringNanjing UniversityNanjingJiangsu 210023China Purple Mountain Laboratories NanjingJiangsu 211111China Hefei National Laboratory HefeiAnhui 230088China National Laboratory of Solid State Microstructures and Department of physics Nanjing UniversityNanjing 210023China

Classical and quantum space-to-ground communications necessitate highly sensitive receivers capable of extracting information from modulated photons to extend the communication distance from near-earth orbits to deep space *** achieve gigabit data rates while mitigating strong background noise photons and beam drift in a highly attenuated free-space channel,a comprehensive design of a multi-functional detector is *** this study,we present an innovative compact multi-pixel superconducting nanowire single-photon detector array that integrates near-unity detection efficiency(91.6%),high photon counting rate(1.61.Gcps),large dynamic range for resolving different photon numbers(1.24),and four-quadrant position sensing function all within one ***,we have constructed a communication testbed to validate the advantages offered by such an *** 8-PPM(pulse position modulation)format communication experiments,we have achieved an impressive maximum data rate of 1.5 Gbps,demonstrating sensitivities surpassing previous benchmarks at respective *** incorporating photon number information into error correction codes,the receiver can tolerate maximum background noise levels equivalent to 0.8 photons/slot at a data rate of 1.0 Mbps—showcasing a great potential for daylight operation ***,preliminary beam tracking tests were conducted through open-loop scanning techniques,which revealed clear quantitative dependence indicating sensitivity variations based on beam *** on the device characterizations and communication results,we anticipate that this device architecture,along with its corresponding signal processing and coding techniques,will be applicable in future space-to-ground communication tasks.

关键词： photon supporting correction

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基于温度特性测试的GaN HEMT功率放大器性能退化研究

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实验技术与管理 2024年第4期41卷 60-65页

作者：汪玫倩林倩青海民族大学物理与电子信息工程学院青海西宁810007 电子科技大学电子科学与工程学院四川成都610000 同方电子科技有限公司江西九江332000

为了研究氮化镓高电子迁移率晶体管功率放大器在不同环境温度下的性能退化情况,根据我国东、西、南、北4个地区的极端温度、平均温度以及电路的工作温度对其进行了系统的温度特性测试。测试结果显示,随着温度升高,该功率放大器的直流特... 详细信息

为了研究氮化镓高电子迁移率晶体管功率放大器在不同环境温度下的性能退化情况,根据我国东、西、南、北4个地区的极端温度、平均温度以及电路的工作温度对其进行了系统的温度特性测试。测试结果显示,随着温度升高,该功率放大器的直流特性和交流特性都出现了不同程度的退化,当温度升高至1.5℃时,小信号增益较常温减少了1.26 dB,三阶交调点下降了6.03 dBm,输出功率与增益最大差值为1.31.dB。分析可得其主要原因是温度升高直接引起阈值电压正向偏移和二维电子气迁移率下降,进而导致饱和电流减小和膝点电压增加,最终使得输出功率显著减小。为保证电路在不同温度下正常工作,提出了一种温度补偿措施来抵消由温度引起的性能退化,这为电路的可靠性设计提供了重要参考。

关键词： GaN HEMT 功率放大器温度特性温度补偿

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Research progress of alkaline earth metal iron-based oxides as anodes for lithium-ion batteries

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Journal of Semiconductors 2024年第2期45卷 21-33页

作者： Mingyuan Ye Xiaorui Hao Jinfeng Zeng lin Li Pengfei {1. Chenglin Zhang Li Liu Fanian Shi Yuhan Wu school of Environmental and Chemical {1. Shenyang University of TechnologyShenyang 110870China College of Materials Science and engineering Nanjing Tech UniversityNanjing 211816China College of Pharmacy Xinjiang Medical UniversityEngineering Research Center of Xinjiang and Central Asian Medicine Resources(Ministry of Education)Urumqi 830000China Institute for Carbon Neutralization College of Chemistry and Materials EngineeringWenzhou UniversityWenzhou 325035China school of {1. and electronic engineering Jiangsu UniversityZhenjiang 212013China Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) Nankai UniversityTianjin 300071China

Anode materials are an essential part of lithium-ion batteries(LIBs),which determine the performance and safety of ***,graphite,as the anode material of commercial LIBs,is limited by its low theoretical capacity of 372 mA·h·g^(−1.,thus hindering further development toward high-capacity and large-scale *** earth metal iron-based oxides are considered a promising candidate to replace graphite because of their low preparation cost,good thermal stability,superior stability,and high electrochemical ***,many issues and challenges remain to be ***,we systematically summarize the research progress of alkaline earth metal iron-based oxides as LIB ***,the material and structural properties,synthesis methods,electrochemical reaction mechanisms,and improvement strategies are ***,existing challenges and future research directions are discussed to accelerate their practical application in commercial LIBs.

关键词： alkali-earth metal iron-based oxides anodes lithium-ion batteries electrochemical energy storage

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Visual test paper based on Au/δ-MnO_(2) hollow nanosphere oxidase-like activity regulation using hexavalent chromium as a smart switch

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Rare Metals 2024年第2期43卷 711-722页

作者： Wen-Chang Zhuang Hai-Yue Zhang Zhen-Yang Chen Wen-Jing Cheng Wei-Dan Na Zhao Li lin Tian school of Materials and Chemical {1. Xuzhou University of TechnologyXuzhou221018China school of Chemistry and Environmental Science Yili Normal UniversityYining835000China

Paper-based sensing platform is a point of need analytical toolkit for safety ***,the sensitivity,specificity,and simplicity are still ***,we report a novel strategy(Au/δ-MnO_(2) hollow nanosphere and 3,3′,5,5′-tetramethylbenzidine(TMB)induced test strips for signal-on detection)that can be utilized for hexavalent chromium(Cr^(6+))***,Cr^(6+)(CrO_(4)^(2−)) as a smart switch can remarkably enhance the oxidase-like activity of Au/δ-MnO_(2) hollow *** presence of Cr^(6+) can regulate the surface electronic redistribution of Au/δ-MnO_(2) and adjust the geometric configuration,which leads to the improvement in oxidase-like activity of Au/δ-MnO_(2).As a proof-of-concept application,a visual paper-based sensing platform of Cr^(6+) along with quantitative analysis by the test strips was successfully *** paper-based sensing platform exhibits a {1.ear range with excellent selectivity for other interfering substances and lower limit of detection of 0.09μmol·L^(−1.,providing a promising toolkit at-home Cr^(6+) measurement and environmental monitoring.

关键词： Point of need Colorimetric biosensing platform Au/δ-MnO_(2) hollow nanosphere Test strip Cr^(6+)

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Unveiling the tailorable electrochemical properties of zeolitic imidazolate framework-derived Ni-doped LiCoO_(2) for lithium-ion batteries in half/full cells

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Journal of Energy Chemistry 2024年第6期93卷 229-242,I0006页

作者： Jian-En Zhou Yiqing Liu Zhijian Peng Quanyi Ye Hua Zhong Xiaoming lin Ronghua Zeng Yongbo Wu Jiaye Ye Guangdong Provincial International Joint Research Center for Energy Storage Materials Key Laboratory of Theoretical Chemistry of EnvironmentMinistry of EducationSchool of ChemistrySouth China Normal UniversityGuangzhou 510006GuangdongChina school of Chemistry and {1. Faculty of ScienceQueensland University of TechnologyBrisbaneQLD 4001Australia Key Laboratory of Atomic and Subatomic Structure and Quantum Control(Ministry of Education) Guangdong Basic Research Center of Excellence for Structure and Fundamental Interactions of MatterSchool of PhysicsSouth China Normal UniversityGuangzhou 510006GuangdongChina Guangdong Provincial Key Laboratory of Quantum engineering and Quantum Materials Guangdong-Hong Kong Joint Laboratory of Quantum MatterSouth China Normal UniversityGuangzhou 510006GuangdongChina

As a prevailing cathode material of lithium-ion batteries(LIBs),LiCoO_(2)(LCO)still encounters the tricky problems of structural collapse,whose morphological {1. and cation doping are crucial for surmounting the mechanical strains and alleviating phase degradation upon ***,we propose a strategy using a zeolitic imidazolate framework(ZIF)as the self-sacrificing template to directionally prepare a series of lini_(0.1.Co_(0.9)O_(2)(LNCO)with tailorable electrochemical *** rational selection of sintering temperature imparts the superiority of the resultant products in lithium storage,during which the sample prepared at 700℃(LNCO-700)outperforms its counterparts in cyclability(1.6.8 mA h g^(-1.at 1.C for 200 cycles in half cells,1.C=275 mA g^(-1.)and rate capability due to the expedited ion/electron transport and the strengthen mechanical *** feasibility of proper Ni doping is also divulged by half/full cell tests and theoretical study,during which LNCO-700(1.7 mA h g^(-1.at 1.C for 1.0 cycles in full cells)surpasses LCO-700 in battery performance due to the mitigated phase deterioration,stabilized layered structu re,ameliorated electro nic co nductivity,a nd exalted lithium sto rage *** work systematically unveils tailorable electrochemical behaviors of LNCO to better direct their practical application.

关键词： Lithium-ion batteries Zeolitic imidazolate framework lini_(0.1.Co_(0.9)O_(2) Electrochemical properties

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Harnessing overlapped temperature-salinity gradient in solar-driven interfacial seawater evaporation for efficient steam and electricity generation

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Journal of Energy Chemistry 2024年第8期95卷 694-700,I0015页

作者： Peida Li Dongtong He Jingchang Sun Jieshan Qiu Zhiyu wang State Key Lab of Fine Chemicals Liaoning Key Lab for Energy Materials and Chemical EngineeringDalian University of TechnologyDalian 116024LiaoningChina school of {1. and electronic Technology Liaoning Normal UniversityDalian 116029LiaoningChina College of Chemical engineering Beijing University of Chemical TechnologyBeijing 100029China

Solar-driven interfacial water evaporation(SIWE)offers a superb way to leverage concentrated solar heat to minimize energy dissipation during seawater *** also engenders overlapped temperaturesalinity gradient(TSG)between water-air interface and adjacent seawater,affording opportunities of harnessing ***,the efficiency of conventional SIWE technologies is limited by significant challenges,including salt passivation to hinder evaporation and difficulties in exploiting overlapped TSG ***,we report self-sustaining hybrid SIWE for not only sustainable seawater desalination but also efficient electricity generation from *** enables spontaneous circulation of salt flux upon seawater evaporation,inducing a self-cleaning evaporative interface without salt passivation for stable steam ***,this design enables spatial separation and simultaneous utilization of overlapped TSG to enhance electricity *** benefits render a remarkable efficiency of90.8%in solar energy utilization,manifesting in co-generation of solar steam at a fast rate of 2.01.kg m^(-2)-h^(-1.and electricity power of 1.91.W m^(-2)with high *** interfacing the hybrid SIWE with seawater electrolyzer constructs a system for water-electricity-hydrogen co-generation without external electricity *** produces hydrogen at a rapid rate of 1.29 L h^(-1.m^(-2)and freshwater with 22 times lower Na+concentration than the World Health Organization(WHO)threshold.

关键词： Solar-driven interfacial water evaporation Steam generation Electricity generation Seawater

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Robust optical mode converter based on topological waveguide arrays

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Chinese physics B 2024年第6期33卷 197-203页

作者：徐宇翔唐文剑姜力炜吴德兴王恒许冰聪陈林 Wuhan National Laboratory for Optoelectronics and {1. of Optical and electronic Information Huazhong University of Science and TechnologyWuhan 430074China

Optical mode converters are essential for enhancing the capacity of optical communication systems. However, fabrication errors restrict the further improvement of conventional mode converters. To address this challenge, we have designed an on-chip TE0–TE1.ode converter based on topologically protected waveguide arrays. The simulation results demonstrate that the converter exhibits a mode coupling efficiency of 93.5% near 1.50 nm and can tolerate a relative fabrication error of 30%. Our design approach can be extended to enhance the robustness for other integrated photonic devices, beneficial for future development of optical network systems.

关键词： on-chip integrated photonic devices topological photonics mode converter robustness

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PCB光电图像融合增强研究

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计算机工程与应用 2009年第31期45卷 25-26,48页

作者：乔闹生叶玉堂黄永林电子科技大学光电信息学院成都610054 湖南文理学院物理与电子科学学院湖南常德415000

分析了去灰度冗余的线性灰度变换与基于傅里叶变换的巴特沃斯高通滤波图像增强的基本原理,讨论了它们在图像增强中的实现方法,指出了各自的优点。为了使整体偏暗的印刷电路板(PCB)光电图像更好地增强,提出了结合两者优点的加权平均图像... 详细信息

分析了去灰度冗余的线性灰度变换与基于傅里叶变换的巴特沃斯高通滤波图像增强的基本原理,讨论了它们在图像增强中的实现方法,指出了各自的优点。为了使整体偏暗的印刷电路板(PCB)光电图像更好地增强,提出了结合两者优点的加权平均图像融合增强新方法。对由CCD获取的PCB光电图像进行了实际的图像增强实验,实验结果证明了基本原理分析的正确性。

关键词：图像增强图像融合线性灰度变换灰度冗余巴特沃斯高通滤波印刷电络板光电图像

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Large Deviations for a Critical Galton-Watson Branching Process

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Acta Mathematicae Applicatae Sinica 2024年

作者： Dou-dou LI Wan-lin SHI Mei ZHANG College of Statistics and Data Science Faculty of Science Beijing University of Technology Laboratory of Mathematics and Complex Systems (Ministry of Education) School of Mathematical SciencesBeijing Normal University Department of Mathematics and physics North China Electric Power University

In this paper, a critical Galton-Watson branching process{Zn}is considered. Large deviation rates of SZn:=∑i=1.nXiare obtained, where{Xi, i≥1.is a sequence of independent and identically distributed random variables and X1.s in the domain of attraction of an α-stable law with α∈(0, 2). One shall see that the convergence rate is determined by the tail index of X1.nd the variance of Z1. Our results can be compared with those ones of the supercritical case.

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第十四届全国量子光学学术会议

作者： Chaoqing Dai(1.,3) Yueyuewang(2),and Jiefang Zhang(1.3) (1.Institute of Non{1.ear physics,Zhejiang normal university,Jinhua 321.04 2.school of Sciences,Zhejiang A&F university,{1.''an 31.300 3.school of Physical Science and Technology,Suzhou university,Suzhou 21.006)

＜正＞We derive analytical bright and dark similaritons of the generalized coupled nonlinear Schr¨odinger equations with distributed *** exact balance condition between the dispersion, nonlinearity and the gain/loss ...

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