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Spectral observation of symmetry-protected selection rules for dynamical high-dimensional parity in alignment magnetic resonance

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science china(physics,Mechanics & Astronomy) 2024年第10期67卷 1-11页

作者： Xu-Xing Geng Kai jin Lu Zhou wang-wang Tang Guoqing Yang Shangqing liang Shao-Ping Wu Guang-ming Huang Gao-xiang li department of physics Huazhong Normal UniversityWuhan 430079China College of Electronics and Information Hangzhou Dianzi UniversityHangzhou 310018China State Key Laboratory of Precision Spectroscopy School of Physics and Electronic ScienceEast China Normal UniversityShanghai 200241China

Multidimensional Floquet-driven alignment systems with dynamical symmetry present various exotic phenomena and ***,there are challenges in directly characterizing large-spin dynamical symmetry from ***,we first observe the symmetry-protected selection rules of dynamical high-dimensional parity in a large-spin(F=4)*** theoretically construct a Floquet-driven alignment system that can be used to reveal high-dimensional spatiotemporal *** the experiment,the system is implemented in Cs atomic gas subjected to two-dimensional Floquet-modulated magnetic resonance *** developing Floquet detection protocols of alignment double-sided spectra,we directly verify symmetry-protected selection rules of dynamical high-dimensional parity for large-spin *** work advances the exploration of dynamical symmetry to large spins,and unravels a universal Floquet scheme for the investigation of symmetry-protected selection rules.

关键词： dynamical high-dimensional symmetry symmetry-protected selection rules large-spin alignment magnetic resonance,Floquet two-mode detection

A data-driven approach to RUL prediction of tools

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Advances in Manufacturing 2024年第1期12卷 6-18页

作者： Wei li liang-Chi zhang Chu-Han Wu Yan wang Zhen-xiang Cui Chao Niu department of Mechanical Engineering University College LondonLondonWC1E 7JEUK Shenzhen Key Laboratory of Cross-Scale Manufacturing Mechanics Southern University of Science and TechnologyShenzhen518055GuangdongPeople’s Republic of China SUSTech Institute for Manufacturing Innovation Southern University of Science and TechnologyShenzhen518055GuangdongPeople’s Republic of China department of Mechanics and Aerospace Engineering Southern University of Science and TechnologyShenzhen518055GuangdongPeople’s Republic of China School of Mechanical and Manufacturing Engineering The University of New South WalesKensingtonNSW2052Australia Baoshan Iron&Steel Co. Ltd.Shanghai200941People’s Republic of China

An effective and reliable prediction of the remaining useful life(RUL)of a tool is important to a metal forming process because it can significantly reduce unexpected maintenance,avoid machine shutdowns and increase system *** study proposes a new data-driven approach to the RUL prediction for metal forming processes under multiple contact sliding *** data-driven approach took advantage of bidirectional long short-term memory(BLSTM)and convolutional neural networks(CNN).A pre-trained lightweight CNN-based network,WearNet,was re-trained to classify the wear states of workpiece surfaces with a high accuracy,then the classification results were passed into a BLSTM-based regression model as inputs for RUL *** experimental results demonstrated that this approach was able to predict the RUL values with a small error(below 5%)and a low root mean square error(RMSE)(around 1.5),which was more superior and robust than the other state-of-the-art methods.

关键词： Remaining useful life(RUL) Bidirectional long short-term memory(BLSTM) Data-driven approach Metal forming

Tunable near-infrared light emission from layered TiS_(3) nanoribbons

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Frontiers of physics 2024年第4期19卷 103-111页

作者： Junrong zhang Cheng Chen Yanming wang Yang Lu Honghong li Xingang Hou Yaning liang Long Fang Du xiang Kai zhang Junyong wang School of Nano-Tech and Nano-Bionics University of Science and Technology of ChinaHefei 230026China CAS Key Laboratory of Nanophotonic Materials and Devices&Key Laboratory of Nanodevices and Applications i-LabSuzhou Institute of Nano-Tech and Nano-Bionics(SINANO)Chinese Academy of SciencesSuzhou 215123China Frontier Institute of Chip and System Fudan UniversityShanghai 200438China School of Materials science and Engineering Shanghai UniversityShanghai 200444China College of Energy&Power Engineering Inner Mongolia University of TechnologyHohhot 010051China

The low-dimensional light source shows promise in photonic integrated *** layered van der Waals material that exhibits luminescence in the near-infrared optical communication waveband is an essential component in on-chip light ***,the tunable near-infrared photoluminescence(PL)of the air-stable layered titanium trisulfide(TiS3)is *** with iodine particles as a transport agent,TiS3 grown by chemical vapor transport using sulfur powder as a transport agent has fewer sulfur vacancies,which increases the luminescence intensity by an order of *** PL emission wavelength can be regulated in the near-infrared regime by thickness *** addition,we observed an interesting anisotropic strain response of PL in layered TiS3 nanoribbon:a blue shift of PL was achieved when the uniaxial tensile strain was applied along the b-axis,while a negligible shift was observed when the strain was applied along the *** work reveals the tunable nearinfrared luminescent properties of TiS3 nanoribbons,suggesting their potential applications as near-infrared light sources in photonic integrated circuits.

关键词： titanium trisulfide near-infrared luminescence S-vacancy tunability strain engineering

Thermally modulated photoelectronic synaptic behavior in HfS_(2)/VO_(2) heterostructure

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Rare Metals 2024年第8期43卷 3798-3809页

作者： Le wang lin wang Xiao-Yun Ye Xiong-Hu Xu li-Yan Shang Ya-Wei li jin-Zhong zhang liang-Qing Zhu Zhi-Gao Hu Technical Center for Multifunctional Magneto-Optical Spectroscopy(Shanghai) Engineering Research Center of Nanophotonics&Advanced Instrument(Ministry of Education)Department of PhysicsSchool of Physics and Electronic ScienceEast China Normal UniversityShanghai 200241China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China

Neuromorphic computing is known for its efficient computational speed,low latency,and reduced power consumption,which is considered a pivotal technology to overcome the von Neumann *** synapses are an indispensable component of neuromorphic computational artificial neural *** guarantee effective and precise processing of optical signals,it must have a high responsivity,detectivity,and the ability to adapt to various ***,a synaptic transistor based on the HfS_(2)/VO_(2) heterojunction with a responsivity of8.6×10^(3) A·W^(-1)and a detectivity of 1.26×10^(14)Jones at405 nm laser was ***,the typical synaptic behavior was successfully simulated,including postsynaptic currents(PSCs),the transition from shortterm plasticity(STP)to long-term plasticity(LTP).When VO_(2) converts from the semiconductor state to the metal state,the HfS_(2)/VO_(2) heterojunction transforms into a Schottky heterojunction from a TypeⅡheterojunction with ***'s important,the heterojunction still exhibits excellent responsivity and detectivity,as well as stability of synaptic *** addition,the classical Pavlovian conditioning experiment is simulated under different laser intensity to study the brain's associative learning *** results demonstrate that the HfS_(2)/VO_(2) heterojunction synapse exhibits significant responsivity and detectivity and is adaptable to high-temperature environments,showing great potential for neuromorphic computational applic ations.

关键词： HfS_(2) VO_(2) Phase transition Photoelectric synapse Heterojunction

Design of hadronic calorimeter for DarkSHINE experiment

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Nuclear science and Techniques 2024年第9期35卷 155-167页

作者： Zhen wang Rui Yuan Han-Qing liu jing Chen xiang Chen Kim Siang Khaw liang li Shu li Kun liu Qi-Bin liu Si-Yuan Song Tong Sun Xiao-Long wang Yu-Feng wang Hai-Jun Yang Jun-Hua zhang Yu-Lei zhang Zhi-Yu Zhao Chun-xiang Zhu Xu-liang Zhu Yi-Fan Zhu Tsung-Dao Lee Institute Shanghai Jiao Tong University1 Lisuo RoadShanghai 201210China Institute of Nuclear and Particle physics School of Physics and Astronomy800 Dongchuan RoadShanghai 200240China Key Laboratory for Particle Astrophysics and Cosmology(MOE) Shanghai Key Laboratory for Particle Physics and Cosmology(SKLPPC)Shanghai Jiao Tong University800 Dongchuan RoadShanghai 200240China Key Laboratory of Nuclear physics and Ion-beam Application(MOE) Fudan UniversityShanghai 200443China Institute of Modern physics Fudan UniversityShanghai 200443China

The sensitivity of the dark photon search through invisible decay final states in low-background experiments relies sig-nificantly on the neutron and muon veto efficiencies,which depend on the amount of material used and the design of the detector *** paper presents the optimized design of the hadronic calorimeter(HCAL)used in the DarkSHINE experiment,which is studied using a GEANT4-based simulation *** geometry is optimized by comparing a traditional design with uniform absorbers to one that uses different thicknesses at different locations on the detector,which enhances the efficiency of vetoing low-energy neutrons at the sub-GeV *** overall size and total amount of material used in the HCAL are optimized to be lower,owing to the load and budget requirements,whereas the overall performance is studied to satisfy the physical objectives.

关键词： Hadronic calorimeter GEANT4 simulation Neutron background Scintillation detector Dark photon

Layer-by-layer epitaxy growth of thickness-controllable two-dimensional tungsten disulfide

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science china(Information sciences) 2024年第5期67卷 302-310页

作者： Jieyuan liang Zixing ZOU Junwu liang Di wang Biao wang Anshi CHU Jiali YI Cheng zhang lizhen FANG Tian zhang Huawei liU Xiaoli ZHU Dong li Anlian PAN Key Laboratory for Micro-Nano physics and technology of Hunan Province State Key Laboratory of Chemo/Biosensing and Chemometrics Hunan Institute of Optoelectronic IntegrationCollege of Materials Science and Engineering School of Physics and ElectronicsHunan University School of Electronic Information and Electrical Engineering Changsha University School of physics and Telecommunication Engineering Yulin Normal University Units Semiconductor technology Co. Ltd. School of physics and Electronics Hunan Normal University

Bilayer transition metal dichalcogenides（TMDs） balance the high mobility of single layers with the high state density of multilayers and therefore have promising application prospects in high-performance electronics. However, the layer-controlled growth of 2D materials is still confronted with challenges such as poor repeatability between different labs and a limited understanding of the growth mechanism at the atomic scale. Herein, we report a new carbon-assisted chemical vapor deposition process that can realize the growth of WS2sheets with high yield, precise thickness controllability, and repeatability. We show that carbon can act as a reducing agent and catalyst that preferentially reacts with the WO3precursor to form intermediate WO3-xproducts with low-valence state W. The resulting oxycarbide gas has a low surface adsorption energy when deposited on the surface of as-grown WS2, which provides nucleation sites for the subsequent layer of WS2growth and leads to the vertical growth of WS2sheets. The growth mechanism is thoroughly investigated. Electrical transport measurements show that the produced bilayer WS2possesses a high carrier mobility(up to 58 cm2·V-1·s-1) and small subthreshold swing（estimated to be 148 mV/decade）,which are among the best reported results for TMDs produced using CVD.

关键词： WS2 thickness-controlled growth chemical vapor deposition additive carbon

Gas microchannel plate-pixel detector for X-ray polarimetry

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Nuclear science and Techniques 2024年第5期35卷 60-73页

作者： Huan-Bo Feng Hong-Bang liu Dong wang Zi-li li Shu-lin liu Qian liu Hang-Zhou li Bin-Long wang Yan-Jun Xie Zong-wang Fan Hui wang Ran Chen Di-Fan Yi Rui-Ting Ma Fei Xie Bo Peng xiang-ming Sun jin li En-Wei liang Present Address:Guangxi Key Laboratory for Relativistic Astrophysics School of Physical Science and TechnologyGuangxi UniversityNanning 530004China PLAC Key Laboratory of Quark and Lepton Physics(MOE)Central China Normal UniversityWuhan 430079China School of science Huzhou UniversityHuzhou 313000China Institute of High Energy physics Chinese Academy of SciencesBeijing 100049China School of Nuclear science and technology University of Chinese Academy of SciencesBeijing 100049China School of Physical science University of Chinese Academy of SciencesBeijing 100049China The 13th Research Institute of china Electronics technology Group Corporation Shijiazhuang 050057China

POLAR-2 is a gamma-ray burst(GRB)polarimeter that is designed to study the polarization in GRB radiation emissions,aiming to improve our knowledge of related ***-2 is expected to utilize an on-board polarimeter that is sensitive to soft X-rays(2-10 keV),called low-energy polarization *** have developed a new soft X-ray polari-zation detector prototype based on gas microchannel plates(GMCPs)and pixel chips(Topmetal).The GMCPs have bulk resistance,which prevents charging-up effects and ensures gain stability during *** detector is composed of low outgassing materials and is gas-sealed using a laser welding technique,ensuring long-term stability.A modulation factor of 41.28%±0.64% is obtained for a 4.5 keV polarized X-ray beam.A residual modulation of 1.96%±0.58% at 5.9 keV is observed for the entire sensitive area.

关键词： X-ray polarimetry Gas microchannel plate-pixel detector Gamma-ray bursts

On adjacent-vertex-distinguishing total coloring of graphs

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science china mathematics 2005年第3期48卷 289-299页

作者： zhang Zhongfu, CHEN xiang’en, li jingwen, YAO Bing, LU Xinzhong & wang Jianfang College of mathematics and Information science, Northwest Normal university, lanzhou 730070, china department of Computer, lanzhou Normal College, lanzhou 730070, china Institute of Applied mathematics, lanzhou Jiaotong university, lanzhou 730070, china College of Information and Electrical Engineering, lanzhou Jiaotong university, lanzhou 730070, china Institute of Applied mathematics, Chinese Academy of sciences, Beijing 100080, china 1. College of mathematics and Information science Northwest Normal University 730070 Lanzhou China 2. department of Computer Lanzhou Normal College 730070 Lanzhou China 3. Institute of Applied mathematics Lanzhou Jiaotong University 730070 Lanzhou China 4. College of Information and Electrical Engineering Lanzhou Jiaotong University 730070 Lanzhou China 5. Institute of Applied mathematics Chinese Academy of Sciences 100080 Beijing China

In this paper, we present a new concept of the adjacent-vertex-distinguishing total coloring of graphs (briefly, AVDTC of graphs) and, meanwhile, have obtained the adjacent-vertex-distinguishing total chromatic number... 详细信息

关键词： graph, proper total coloring, adjacent-vertex-distinguishing total coloring, adjacent-vertex-distinguishing total chromatic number.

lncRNA Gm20257 alleviates pathological cardiac hypertrophy by modulating the PGC-1α–mitochondrial complexⅣaxis

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Frontiers of Medicine 2024年第4期18卷 664-677页

作者： Tong Yu Qiang Gao Guofang zhang Tianyu li Xiaoshan liu Chao li Lan zheng xiang Sun Jianbo Wu Huiying Cao Fangfang Bi Ruifeng wang Haihai liang Xuelian li Yuhong Zhou lifang Lv Hongli Shan department of Physiology School of Basic MedicineHarbin Medical UniversityHarbin150081China State Key Laboratory of Frigid Zone Cardiovascular Disease Department of Pharmacology(State-Province Key Laboratories of Biomedicine-Pharmaceutics of China Key Laboratory of Cardiovascular Research Ministry of Education)College of PharmacyHarbin Medical UniversityHarbin150081China The Center of Functional Experiment Teaching School of Basic MedicineHarbin Medical UniversityHarbin150081China

Pathological cardiac hypertrophy,a major contributor to heart failure,is closely linked to mitochondrial *** roles of long noncoding RNAs(lncRNAs),which regulate mitochondrial function,remain largely unexplored in this ***,a previously unknown lncRNA,Gm20257,was *** markedly increased under hypertrophic stress in vivo and in *** suppression of Gm20257 by using small interfering RNAs significantly induced cardiomyocyte ***,the overexpression of Gm20257 through plasmid transfection or adeno-associated viral vector-9 mitigated angiotensinⅡ-induced hypertrophic phenotypes in neonatal mouse ventricular cells or alleviated cardiac hypertrophy in a mouse TAC model respectively,thus restoring cardiac ***,Gm20257 restored mitochondrial complexⅣlevel and enhanced mitochondrial *** prediction showed that Gm20257 had a high binding score with peroxisome proliferator–activated receptor coactivator-1(PGC-1α),which could increase mitochondrial complex ***,Western blot analysis results revealed that Gm20257 substantially affected the expression of PGC-1α.Further analyses through RNA immunoprecipitation and immunoblotting following RNA pull-down indicated that PGC-1αwas a direct downstream target of *** interaction was demonstrated to rescue the reduction of mitochondrial complex IV induced by hypertrophic stress and promote the generation of mitochondrial *** findings suggest that Gm20257 improves mitochondrial function through the PGC-1α-mitochondrial complexⅣaxis,offering a novel approach for attenuating pathological cardiac hypertrophy.

关键词： lncRNA Gm20257 cardiac hypertrophy PGC-1α mitochondrial complexⅣ ATP