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Nonlinear Multimodal Interference as Ultrafast Photonic Device for Dual-Wavelength Domain-Wall Dark Pulse Generation

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Chinese Physics Letters 2024年第7期41卷 47-52页

作者：王珊宋博乐窦鑫河乔飞鸿李响王锦波吕志国 School of Physical Science and Technology Key Laboratory of Semiconductor Photovoltaic Technology of Inner Mongolia Autonomous RegionInner Mongolia UniversityHohhot 010021China

In comparison to bright pulses, better stability that is not susceptible to loss makes dark pulses accessible for applications in such fields as signal processing, optics sensing, and quantum communication. Here we investigate the dual-wavelength domain-wall dark pulse generation in a graded-index multimode fiber(GIMF) based anomalous dispersion single-mode fiber(SMF) laser. By optimizing intra-cavity nonlinearity and pulse polarization, the mode-locked states can evolve each other between bright pulses, dark pulses, and bright-dark pulse pairs. The evolution mechanism among them may be relevant to the coherent mode superposition, spectral filtering, and mode selection in SMF-GIMF-SMF hybrid-fiber modulation devices that affect the pulse formation and evolution in temporal, frequency, and space domains. These results provide a valuable reference for promoting further development of nonlinear optics and ultrafast optics, in which ultrafast photonic devices, with low cost, simple manufacture as well as wide adaptability, as novel pulsed generation technique, play a vital role.

关键词： fiber polarization optics

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Experimental Proposal on Non-Hermitian Skin Effect by Two-dimensional Quantum Walk with a Single Trapped Ion

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Chinese Physics Letters 2024年第4期41卷 19-24页

作者：侯琬儿唐皓许勤林毅恒 CAS Key Laboratory of Microscale Magnetic Resonance and School of Physical Sciences University of Science and Technology of ChinaHefei 230026China Hefei National Laboratory University of Science and Technology of ChinaHefei 230088China

Non-Hermitian Hamiltonians are widely used in describing open systems with gain and loss,among which a key phenomenon is the non-Hermitian skin *** we report an experimental scheme to realize a twodimensional(2D)discrete-time quantum walk with non-Hermitian skin effect in a single trapped *** is shown that the coin and 2D walker states can be labeled in the spin of the ion and the coherent-state lattice of the ion motion,*** numerically observe a directional bulk flow,whose orientations are controlled by dissipative parameters,showing the emergence of the non-Hermitian skin *** then discuss an experimental implementation of our scheme in a laser-controlled trapped Ca^(+)*** experimental proposal may be applicable to research of dissipative quantum walk systems and may be able to generalize to other platforms,such as superconducting circuits and atoms in cavity.

关键词： effect dissipative quantum

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Thermodynamic and experimental evaluation of the sustainable recycling of magnesium alloy scrap by vacuum distillation based on vapor-liquid equilibrium

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Journal of Magnesium and Alloys 2025年第1期13卷 283-295页

作者： Lipeng Wang Dong Liang Yang Tian Jianxue Chai Rui Li Shuji Wu Bin Yang Baoqiang Xu Yong Deng Key Laboratory for Nonferrous Vacuum Metallurgy of Yunnan Province Kunming University of Science and TechnologyKunmingChina State Key Laboratory of Complex Non-ferrous Metal Resources Clean Utilization Kunming University of Science and TechnologyKunmingChina Engineering Research Center of Aluminum Industry of Yunnan Province Kunming University of Science and TechnologyKunmingChina National Engineering Research Center of Vacuum Metallurgy Kunming University of Science and TechnologyKunmingChina Faculty of Metallurgical and Energy Engineering Kunming University of Science and TechnologyKunmingChina Shanxi Regal Advanced Material Co. Ltd.Yuncheng CityChina

Magnesium(Mg)alloys are widely used lightweight structural materials for automobiles and help reduce carbon ***,their use increases the production of Mg alloy scrap,which is recycled at a much lower rate than aluminum,and its greater complexity poses challenges to existing recycling *** vacuum distillation can be used to recycle Mg alloy scrap,this requires optimizing and maximizing metal recirculation,but there has been no thermodynamic analysis of this *** this study,the feasibility and controllability of separating inclusions and 23 metal impurities were evaluated,and their distribution and removal limits were *** analyses and experimental results showed that inclusions and impurity metals of separation coefficient lgβ_(i)≤-5,including Cu,Fe,Co,and Ni below 0.001 ppm,could be removed from the *** Zn entered the recycled Mg,while impurities with-1vacuum distillation recycling:lower temperatures and higher system pressures for Zn separation in the early stage,and the early termination of the recovery process in the later stage or a continuous supply of raw melt can also prevent contamination during *** alloying elements Al and Zn in Mg alloy scrap can be further recovered and purified by vacuum distillation when economically feasible,to maximize the recycling of metal resources.

关键词： Magnesium alloy Scrap recycling Thermodynamic analysis Impurity removal vacuum distillation

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Electronic thermal conductivity of tungsten-based systems during collision cascade processes

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Nuclear science and Techniques 2025年第5期36卷 167-176页

作者： Jiong-Rong Wang Bi-Cai Pan Key Laboratory of Strongly-Coupled Quantum Matter Physics Department of PhysicsUniversity of Science and Technology of ChinaHefei 230026China Hefei National Laboratory for Physical Sciences at Microscale University of Science and Technology of ChinaHefei 230026China

The thermal conductivity of plasma-facing materials(PFM)exposed to intense radiation is a critical concern for the reliable usage of materials in fusion ***,limited research has been performed regarding the thermal conductivity of structures that rapidly change in a short time during collision cascade processes under *** this study,we employed the tight-binding(TB)method to investigate the electronic thermal conductivity(κ_(e))of tungsten-based systems during various cascading *** found thatκ_(e) values sharply decrease within the initial 0.3 picoseconds and then partially recover at a slow pace;this is closely linked to the evolution of defects and microstructural *** increase in the initial kinetic energy of the primary knock-on atom and the presence of a high concentration of hydrogen atoms further decrease theκ_(e) ***,higher temperatures have a significant positive effect onκ_(e).Furthermore,the presence of a grain boundary∑5[001](130)substantially reducesκ_(e),whereas the absorption effect of point defects by the grain boundary has little influence onκ_(e) during *** findings provide a theoretical basis for evaluating changes in the thermal conductivity performance of PFMs during their usage in nuclear fusion reactors.

关键词： Electronic thermal conductivity Collision cascade Tungsten Plasma-facing materials Tight-binding calculations

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Theoretical Analysis of Multigap Cavity 51

Theoretical Analysis of Multigap Cavity

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51st IEEE International Conference on Plasma science, ICOPS 2024 and 4th Asia-Pacific Conference on Plasma and Terahertz science, APCOPTS 2024

作者： Shi, N. Tian, H. Pan, P. Cai, J. Wang, S. Gong, Y. Beijing Vacuum Electronics Research Institute National Key Laboratory of Science and Technology on Vacuum Electronics Beijing China University of Electronic Science and Technology of China National Key Laboratory of Science and Technology on Vacuum Electronics Chengdu China

ISBN: (纸本)9798350360912

For the vacuum electron devices, the multigap resonant cavity with higher characteristic impedance and stronger operating performance is needed, which can meet the requirement of terahertz amplifier for the operating performance of the interaction circuit. The electromagnetic characteristics of a multigap resonant cavity is presented in this paper. For a multigap cavity structure, the slot, the upper coupling cavity region, and the lower coupling region have the same dimension along the direction of electron beam *** to the position of the electromagnetic wave, the electromagnetic modes in the multigap cavity can be divided into the slot modes and the cavity modes. The field of the slot mode is concentrated in the slot regions, and the field of the cavity mode is concentrated in the cavity regions. In principle, every longitudinal field mode can be used as the operating mode of the multigap resonant cavity. The coupling coefficient, is the ratio of the induced high frequency current component and the high frequency current component of the beam. The density and velocity of the electron beam are modulated while passing through the resonant gap. © 2024 IEEE.

关键词： Cavity resonators

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The B-site ordering in RFe_(0.5)Cr_(0.5)O_(3)ceramics and its effect on magnetic properties

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Chinese Physics B 2024年第10期33卷 434-441页

作者： Li Hou Lei Shi Liping Yang Yiqiang Liu Zhitao Li Lanxiang Meng School of Materials Science and Engineering Anyang Institute of TechnologyAnyang 455000China Hefei National Laboratory for Physical Sciences at Microscale University of Science and Technology of ChinaHefei 230026China

To insight into the B-site ordering in RFe_(0.5)Cr_(0.5)O_(3)ceramics,a series of RFe_(0.5)Cr_(0.5)O_(3)ceramics(R=La,Y,Lu)were synthesized by the sol-gel method,and the structural and magnetic properties were systemically *** using the Rietveld refinement of all samples,it is found that the structural distortion is increased as the R ionic radius decreases,leading to the weakened interactions between Fe/Cr ***,the Fe and Cr are arranged in disorder in LaFe_(0.5)Cr_(0.5)O_(3),but partially ordered in YFe_(0.5)Cr_(0.5)O_(3)and LuFe_(0.5)Cr_(0.5)O_(3),showing an increasing trend of the proportion of ordered domains with the decrease of R ionic *** fitting the temperature-dependent magnetizations,it is identified that the magnetization reversal(MR)in disorder LaFe_(0.5)Cr_(0.5)O_(3)is resulted from the competition between the moments of Cr and Fe *** the partially ordered YFe_(0.5)Cr_(0.5)O_(3)and LuFe_(0.5)Cr_(0.5)O_(3)ceramics,because of the presence of Fe-O-Cr networks in the ordered domains whose moment is antiparallel to that of Fe-O-Fe and Cr-O-Cr in the disordered domains,the compensation temperature T_(comp)of MR is increased by nearly 50 *** results suggest that the changing of R-site ions could be used very effectively to modify the Fe-O-Cr ordering,apart from the structural distortion,which has a direct effect on the magnetic exchange interactions in RFe_(0.5)Cr_(0.5)O_(3)*** at values of composition where ordered domains are expected to be larger in number as compared to disordered domains and with a weaker structural distortion,one can expect a higher transition temperature Tcomp,providing a different view for adjustment of the magnetic properties of RFe_(0.5)Cr_(0.5)O_(3)ceramics for practical applications.

关键词： RFe_(0.5)Cr_(0.5)O_(3)ceramics structural distortion B-site ordering magnetization reversal

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A Novel Method of Field Analysis for Staggered Double Vane Structure 51

A Novel Method of Field Analysis for Staggered Double Vane S...

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51st IEEE International Conference on Plasma science, ICOPS 2024 and 4th Asia-Pacific Conference on Plasma and Terahertz science, APCOPTS 2024

作者： Tian, H. Shi, N. Pan, P. Cai, J. Gong, Y. Beijing Vacuum Electronics Research Institute National Key Laboratory of Science and Technology on Vacuum Electronics Beijing China University of Electronic Science and Technology of China National Key Laboratory of Science and Technology on Vacuum Electronics Chengdu China

ISBN: (纸本)9798350360912

The staggered double vane (SDV) structure is a widely studied and used slow wave structure in sheet electron beam traveling wave tubes (TWTs) and other sheet beam vacuum electron devices. To understand the form of field distribution of SDV structure is important to design and accomplish the fast algorithm of SDV vacuum devices. © 2024 IEEE.

关键词： Slow wave structures

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Single Manganese Atom Anchored on N-doped Graphene as a Promising Catalyst for Nitrogen Reduction Reaction:A First-Principles Study

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Chinese Journal of Chemical Physics 2025年第2期38卷 189-198,I0013-I0019,I0040页

作者： Li Xu Yong Tang Mengge Cao Kuan Zhou Hongbao Li Institutes of Physical Science and Information Technology Key Laboratory of Structure and Functional Regulation of Hybrid Materials(Ministry of Education)

Electrochemical synthesis of ammonia represents a green and environmental-ly friendly method distinct from tradi-tional Harper-Bosch processes,which demand stringent ***,identifying a catalyst with high selec-tivity and catalytic activity to cleave the robust triple bond of N_(2)remains a formidable ***,we present a systematic study on the geo-metrical and electronic structure,intensity of N_(2)adsorption,reaction intermediates,change in Gibbs free energy,and desorption of by-product hydrazine for the nitrogen reduction reac-tion employing a MnNx-graphene(x=3,4)catalyst from a theoretical *** com-putational results reveal that MnN3-graphene exhibits superior catalytic performance pre-dominantly via the distal mechanism,with a low potential of 0.49 ***,the detach-ment of the produced NH3 is facilitated with a free energy of only 0.27 eV,significantly lower than those of previous catalysts,ensuring the exceptional durability of MnN_(3)-*** study offers theoretical insights guiding the exploration of single Mn atom catalysts in ammo-nia synthesis.

关键词： Manganese N-doped graphene Nitrogen reduction reaction

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Non-Hermitian Physics in Mesoscopic Electron Transport Through Coupled Quantum Dots

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Chinese Physics Letters 2025年第4期42卷 114-124页

作者： Yiyang Li Jincheng Lu Chen Wang Jian-Hua Jiang School of Physical Science and Technology&Collaborative Innovation Center of Suzhou Nano Science and Technology Soochow UniversitySuzhou215006China Key Laboratory of Intelligent Optoelectronic Devices and Chips of Jiangsu Higher Education Institutions School of Physical Science and TechnologySuzhou University of Science and TechnologySuzhou215009China Advanced Technology Research Institute of Taihu Photon Center School of Physical Science and TechnologySuzhou University of Science and TechnologySuzhou 215009China Department of Physics Zhejiang Normal UniversityJinhua321004China School of Biomedical Engineering Division of Life Sciences and MedicineUniversity of Science and Technology of ChinaHefei230026China Suzhou Institute for Advanced Research University of Science and Technology of ChinaSuzhou215123China School of Physical Sciences University of Science and Technology of ChinaHefei 230026China

We investigate electron mesoscopic transport in a three-terminal setup with coupled quantum dots and a magnetic *** mapping the original transport problem into a non-Hermitian Hamiltonian form,we study the interplay between the coherent couplings between quantum dots,the magnetic flux,and the dissipation due to the tunnel coupling with the reservoirs.

关键词： quantum dots magnetic fluxby electron mesoscopic transport non hermitian physics magnetic fluxand coherent couplings transport problem tunnel coupling

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Regulating Li transport in Li-magnesium alloy for dendrite free Li metal anode

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Nano Research 2023年第6期16卷 8338-8344页

作者： Jinxi Wang Yadong Ye Hongmin Zhou Wei Zhang Zhaowei Sun Jiawen Zhu Hongchang Jin Huanyu Xie Haoliang Huang Yi Cui Rong Huang Zezhong Li Song Jin Hengxing Ji Hefei National Laboratory for Physical Sciences at the Microscale CAS Key Laboratory of Materials for Energy ConversionDepartment of Applied ChemistryUniversity of Science and Technology of ChinaHefei 230026China Hefei National Research Center for Physical Sciences at the Microscale University of Science and Technology of ChinaHefei 230026China Hefei National Laboratory for Physical Sciences at the Microscale and Anhui Laboratory of Advanced Photon Science and Technology University of Science and Technology of ChinaHefei 230026China Vacuum Interconnected Nanotech Workstation(NANO-X) Suzhou Institute of Nano-Tech and Nano-Bionics(SINANO)Suzhou 215123China School of Earth and Space Sciences University of Science and Technology of ChinaHefei 230026China

Li metal has become a strong candidate for anode due to its high theoretical specific capacity and lowest electrochemical ***,the poor reversibility caused by continuous chemical and electrochemical degradation hinders the practical application of Li ***-solution-based metal alloy phases have been proposed as hosts for regulating the non-dendrite electrodeposition,but the fundamental understanding remains unclear due to the drastically different deposition behaviors of Li on *** we found the difference in the diffusion coefficient of Li atoms on solid-solution-based metal alloy phases(Li-Mg and Li-Ag alloys)was a major contributor to the different deposition *** low Li atom diffusion coefficient of Li-Mg alloy showed a preferential Li accumulation on the upper surface rather than the inward-growth plating of Li atoms into alloy foil in Li-Ag *** the process of secondary recrystallization,we improved the diffusion coefficient of Li atoms in Li-Mg alloy that facilitates the inward transfer rather than surface plating of Li *** this case,the recrystallized Li-Mg alloy underwent a solidsolution phase change in the delithiation-lithiation cycles which yielded a high Coulombic efficiency of 99.3%with a reversible gravimetric capacity of 2,874 mAh·g−1 and superior cycling stability over 5,000 h without dendrite growth.

关键词： Li-Mg alloy solid solution recrystallization lithium metal anode diffusion coefficient

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