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Response of InSight resonance modes to environmental factors on Mars

Earth and Planetary physics 2024年第4期8卷 579-588页

作者： LiFei Tian HuaJian Yao Laboratory of Seismology and Physics of Earth’s Interior School of Earth and Space SciencesUniversity of Science and Technology of ChinaHefei 230026China Chinese Academy of Sciences Center for Excellence in Comparative Planetology University of Science and Technology of ChinaHefei 230026China Mengcheng National Geophysical Observatory University of Science and Technology of ChinaMengcheng 230026China

The InSight(Interior Exploration using Seismic Investigations,Geodesy,and Heat Transport)mission has recorded continuous ambient noise signals with many spectral peaks since its landing in *** majority of these peaks are modes produced by instrumental vibrations and are associated with environmental factors,such as temperature and wind energy *** how these modes react under various conditions is crucial because it aids in identifying their *** this study,we analyzed the three-component spectra of InSight recordings from sols 184–738 and obtained the horizontal-to-vertical spectral ratio(HVSR,also known as H/V)curves for different time *** primary modes,such as those at 3.3 and 4.1 Hz,exhibited different behaviors,suggesting diverse *** modes were sensitive to low temperature and some were sensitive to high ***,we investigated the influence of wind and temperature on the H/V *** peak frequency was mainly affected by temperature,whereas the H/V value was not associated with the temperature or wind *** these modes and elucidating their origins are significant for processing signals from InSight and can provide valuable guidance for designing future planetary seismometers.

关键词： Mars InSight spectral peaks H/V curve

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Microstructure dependence of electrochemical corrosion resistance for rapidly solidified Ti_(50)Al_(48)Mo_(2)alloy

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Journal of Materials science & technology 2024年第18期185卷 58-68页

作者： Chonghao Sun Ruilin Xiao Kelun Liu Ying Ruan Bingbo Wei MOE Key Laboratory of Materials Physics and Chemistry under Extraordinary Conditions School of Physical Science and TechnologyNorthwestern

The rapid solidification of undercooled liquid Ti_(50)Al_(48)Mo_(2)alloy was achieved by the electromagnetic lev-itation(EML)*** small and medium undercoolings,primary(βTi)dendrite reacted with sur-rounding liquid to drive a peritectic transformation into the(αTi)*** solutal Mo and Al segrega-tions were located within the dendrite center and the grain boundary during peritectic transformation,consequently B2 phase in the dendrite center andγphase at the grain boundary *** under-cooling exceeded 253 K,the peritectic transformation was completely inhibited,and the formation of the B2 phase andγphase was completely *** ultrafine eutectoid structure was formed and a complete solute trapping effect was *** solute distribution facilitated the forma-tion of thicker passivation film with lower defect density and higher film resistance on the alloy ***,this weakened micro-galvanic effect reduced the susceptibility to pitting corrosion,and conse-quently the corrosion resistance of the alloy was improved.

关键词： Ti-Al based alloys Electromagnetic levitation technique Undercooling Rapid solidification Passivation film

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An Improved Iterated Greedy Algorithm for Solving Rescue Robot Path Planning Problem with Limited Survival Time

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Computers, Materials & Continua 2024年第7期80卷 931-947页

作者： Xiaoqing Wang Peng Duan Leilei Meng Kaidong Yang School of Computer Science Liaocheng UniversityLiaocheng252000China Shandong Key Laboratory of Optical Communication Science and Technology School of Physics Science and Information TechnologyLiaocheng UniversityLiaocheng252059China

Effective path planning is crucial for mobile robots to quickly reach rescue destination and complete rescue tasks in a post-disaster *** this study,we investigated the post-disaster rescue path planning problem and modeled this problem as a variant of the travel salesman problem(TSP)with life-strength *** address this problem,we proposed an improved iterated greedy(IIG)***,a push-forward insertion heuristic(PFIH)strategy was employed to generate a high-quality initial ***,a greedy-based insertion strategy was designed and used in the destruction-construction stage to increase the algorithm’s exploration ***,three problem-specific swap operators were developed to improve the algorithm’s exploitation ***,an improved simulated annealing(SA)strategy was used as an acceptance criterion to effectively prevent the algorithm from falling into local *** verify the effectiveness of the proposed algorithm,the Solomon dataset was extended to generate 27 instances for ***,the proposed IIG was compared with five state-of-the-art *** parameter analysiswas conducted using the design of experiments(DOE)Taguchi method,and the effectiveness analysis of each component has been verified one by *** results indicate that IIGoutperforms the compared algorithms in terms of the number of rescue survivors and convergence speed,proving the effectiveness of the proposed algorithm.

关键词： Rescue robot path planning life strength improved iterative greedy algorithm problem-specific swap operators

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The structure, electrical properties and phase diagram of Sm-modified BiFeO3-PbTiO3 solid solution ceramics

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Ceramics International 2025年第14期51卷 18477-18484页

作者： Xiang, Yanzi Su, Zijie Hu, Hao Kubrin, Stas P. Ter-Oganessian, Nikita V. Feng, Guobao Ren, Wei Zhang, Nan Zhuang, Jian Electronic Materials Research Laboratory Key Laboratory of the Ministry of Education & International Centre for Dielectric Research School of Electronic Science and Engineering Xi'an Jiaotong University Xi'an710049 China Research Institute of Physics Southern Federal University Rostov-On-Don 344090 Russia National Key Laboratory of Science and Technology on Space Microwave China Academy of Space Technology Xi'an710100 China

BiFeO3-PbTiO3 based materials attract lots of research interests due to the rich structure and properties variants. In this work, a series of 0.55Bi1-xSmxFeO3-0.45PbTiO3 solid solution ceramics with x = 0.1–0.3 are synthesized by sintering method. X-ray diffraction results show the phase evolution with the existence of rhombohedral and tetragonal phase in the composition range (i.e., morphotropic phase boundary, MPB) of x = 0.125–0.175. Both ferroelectric and piezoelectric properties are enhanced when approaching to MPB. Moreover, the additional thermal treatments including oxygen annealing and quenching processes are successfully employed to obtain further enhanced properties with remnant polarization Pr = 38.8 μC/cm2 and piezoelectric coefficient d33 = 131 pC/N. Finally, the phase diagram of the ternary system BiFeO3-SmFeO3-PbTiO3 is constructed based on the results in this work and literatures, which could be valuable for efficiently developing BiFeO3-PbTiO3 based ferroic materials with desired properties. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Sintering

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Improved thermometry sensitivity of red-emitting SrGd2O4:Er3+,Yb3+ phosphors using novel NTCL-FIR technology based on 2H11/2 and 4F9/2

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Journal of Rare Earths 2025年第6期43卷 1140-1149页

作者： Ding, Shuangshuang Yan, Yongbiao Zhou, Jianwei Hua, Yangyang Cai, Hongxing Li, Shuang College of Physics Changchun University of Science and Technology Changchun130022 China International Joint Research Center for Nanophotonics and Biophotonics Nanophotonics and Biophotonics Key Laboratory of Jilin Province School of Physics Changchun University of Science and Technology Changchun130022 China Spectral Laboratory Changchun University of Science and Technology Changchun130022 China

In this work, the upconversion luminescence (UCL) and temperature-sensing properties of SrGd2O4 phosphors doped with Er3+, Yb3+ were investigated. The UCL performance was studied by adjusting the doping concentrations of Er3+, Yb3+. It can be found that the intensity of red UCL is effectively improved by doping Yb3+ ions. The band structures of SrGd2O4, SrGd2O4:5 mol%Er3+, and SrGd2O4:5 mol%Er3+, 15 mol%Yb3+ were calculated using the density functional theory (DFT) to verify the experimental results. The thermal sensitivity of SrGd2O4:5 mol%Er3+, 15 mol%Yb3+ phosphors was studied using the novel fluorescence intensity ratio of non-thermally coupled energy levels (NTCL-FIR) technique based on the 2H11/2 and 4F9/2 energy levels. The analytical results reveal that the maximum values of Sr are 1.69%/K (300 K), 1.18%/K (300 K) and 1.47%/K (300 K) respectively under 915, 980 and 1550 nm excitations. The Sr values of novel NTCL-FIR are compared with that of thermal coupling of energy level (TCL) and other studies in the same field. The results show that the thermometry sensitivity of red-emitting UCL materials can be enhanced by using the novel NTCL-FIR technique. In addition, the intense red UCL of SrGd2O4:Er3+,Yb3+ phosphors have the advantage of deeply penetrating biological tissues. Therefore, the combination of novel NTCL-FIR and red-emitting SrGd2O4:Er3+,Yb3+ phosphors could be conducive to temperature monitoring in vivo. © 2024 Chinese Society of Rare Earths

关键词： Phosphors

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Sub-nanotesla sensitivity at the nanoscale with a single spin

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National science Review 2023年第12期10卷 164-173页

作者： Zhiyuan Zhao Xiangyu Ye Shaoyi Xu Pei Yu Zhiping Yang Xi Kong Ya Wang Tianyu Xie Fazhan Shi Jiangfeng Du CAS Key Laboratory of Microscale Magnetic Resonance and School of Physical Sciences University of Science and Technology of China CAS Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of China National Laboratory of Solid State Microstructures and Department of Physics Nanjing University Hefei National Laboratory University of Science and Technology of China School of Biomedical Engineering and Suzhou Institute for Advanced Research University of Science and Technology of China

High-sensitivity detection of the microscopic magnetic field is essential in many *** sensitivity and high spatial resolution are mutually contradictory in measurement,which is quantified by the energy resolution *** we report that a sensitivity of 0.5 nT/(Hz)(1/2) at the nanoscale is achieved experimentally by using nitrogen-vacancy defects in diamond with depths of tens of *** achieved sensitivity is substantially enhanced by integrating with multiple quantum techniques,including real-time-feedback initialization,dynamical decoupling with shaped pulses and repetitive readout via quantum *** magnetic sensors will shed new light on searching new physics beyond the standard model,investigating microscopic magnetic phenomena in condensed matters,and detection of life activities at the sub-cellular scale.

关键词： magnetic sensitivity spatial resolution quantum sensing nanoscale energy resolution limit

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One stone,three birds:up-conversion,photothermal and p-n heterojunction to boost BiOBr:Yb^(3+),Er^(3+)/Cu_(3)Mo_(2)O_(9) full spectrum photodegradation

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Frontiers of Chemical science and Engineering 2024年第10期18卷 119-131页

作者： Xintong Yao Dong Zhang Yupeng Liu Yanzhao Chen Dafeng Zhang Junchang Liu Xue-Yang Ji Hengshuai Li Peiqing Cai Xipeng Pu School of Materials Science and Engineering Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell TechnologyLiaocheng UniversityLiaocheng 252000China School of Physics Science and Information Technology Shandong Key Laboratory of Optical Communication Science and TechnologyLiaocheng UniversityLiaocheng 252000China College of Optical and Electronic Technology China Jiliang UniversityHangzhou 310018China

Broadening spectral response range to realize the full spectrum photocatalysis is crucial to develop photocatalysts with satisfactory light-energy conversion ability.A full-spectrum driven p-n heterojunction photocatalytic system was rationally designed through introducing the Er^(3+)/Yb^(3+)co-doped BiOBr with up-conversion effect as the collector of near infrared light and photocatalysts ***,Cu_(3)Mo_(2)O_(9) with the photothermal effect as a heat source to accelerate the reaction at the surface through absorbing the near infrared *** photocatalytic activity of BiOBr:Yb^(3+),Er^(3+)/Cu3Mo2O9 composite was markedly strengthened under visible and near infrared light irradiation,and the BiOBr:Yb^(3+),Er^(3+)/Cu_(3)Mo_(2)O_(9)-5 composite displayed the optimal photodegradation activities for 0.03372 min^(-1) and 0.058 h^(-1),being 2.3-folds and 2.4-folds than that of pure BiOBr:Yb^(3+),Er^(3+)under the visible and near infrared light,*** position of doped ions(Yb^(3+)and Er^(3+))in BiOBr:Yb^(3+),Er^(3+)was determined from the X-ray absorption fine structure *** the reasonable mechanism of p-n heterojunction was proposed base on the results of experimental and density functional theory *** work provides a rational strategy for the design and development of full-spectrum heterojunction photocatalysts with the up-conversion and photothermal effects to increase the photocatalytic performance.

关键词： photocatalyst full spectrum p-n heterojunction photothermal effect up-conversion

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Vector meson’s spin alignments in high energy reactions

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science China(physics,Mechanics & Astronomy) 2025年第1期68卷 1-16页

作者： Jin-Hui Chen Zuo-Tang Liang Yu-Gang Ma Xin-Li Sheng Qun Wang Key Laboratory of Nuclear Physics and Ion-beam Application(MoE) Institute of Modern PhysicsFudan UniversityShanghai 200433China Institute of Frontier and Interdisciplinary Science Key Laboratory of Particle Physics and Particle Irradiation(MOE)Shandong UniversityQingdao 266237China INFN-Firenze Sesto Fiorentino FI 50019Italy Department of Modern Physics University of Science and Technology of ChinaHefei 230026China School of Mechanics and Physics Anhui University of Science and TechnologyHuainan 232001China

The global spin alignment of vector mesons has been observed by the STAR collaboration at the Relativistic Heavy Ion Collider(RHIC)at Brookhaven National laboratory(BNL).It provides a unique opportunity to probe the correlation between the po-larized quark and antiquark in the strongly coupled quark-gluon plasma(sQGP)produced in relativistic heavy ion collisions,opening a new window to explore the properties of *** addition,spin alignments of vector mesons have also been observed in other high-energy particle collisions such as e^(+)e^(−)annihilations at high energies where hadron production is dominated by quark fragmentation *** results obtained are quite different from those obtained in heavy ion collisions where quark coalescence/combination mechanism dominates suggesting strong dependence on hadronization *** comprehensive studies in different hadronization processes are *** this article,we present a brief review of theoretical and experimen-tal advances in the study of vector meson’s spin alignments in a variety of high-energy particle collisions,with emphasis on hadronization mechanisms.

关键词： vector meson spin alignment global polarization relativistic heavy ion collisions fragmentation

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Terahertz toroidal dipole metamaterial sensors for detection of aflatoxin B1

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Chinese physics B 2024年第3期33卷 672-676页

作者：徐建伟欧阳收剑段守鑫邹林儿叶丹妮杨思嘉邓晓华 Department of Physics School of Physics and Materials ScienceNanchang UniversityNanchang 330031China Department of Measuring and Controlling Technology and Instrument Institute of Advanced ManufacturingNanchang UniversityNanchang 330031China Institute of Space Science and Technology Nanchang UniversityNanchang 330031China

Terahertz metamaterial biosensors have attracted significant attention in the biological field due to their advantages of label-free,real-time and in situ *** this paper,a highly sensitive metamaterial sensor with semi-ring mirror symmetry based on toroidal dipole resonance is designed for a new metamaterial *** is shown that a refractive index sensitivity of 337.5 GHz per refractive index unit can be achieved under an analyte of saturated thickness near a 1.33 THz transmission *** biosensor samples where aflatoxin B1 is dropped on the metamaterial surface in our experiment,dip amplitudes of transmission varying from 0.1904 to 0.203 and 0.2093 are observed as aflatoxin B1 concentrations are altered from 0 to 0.001μg·ml-1 and to 0.01μg·ml-1,***,when aflatoxin B1 concentrations are 0.1μg·ml-1,1μg·ml-1,10μg·ml-1 and 100μg·ml-1,dip amplitudes of 0.2179,0.226,0.2384 and 0.2527 and dip redshifts of 10.1 GHz,20.1 GHz,27.7 GHz and 37.6 GHz are respectively *** results illustrate high-sensitivity,label-free detection of aflatoxin B1,enriching the applications of sensors in the terahertz domain.

关键词： terahertz metamaterial toroidal dipole aflatoxin B1

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Ascent Trajectory Optimization Design of Solid Launch Vehicle Based on Newton Iteration Method

Ascent Trajectory Optimization Design of Solid Launch Vehicl...

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2023 China Automation Congress, CAC 2023

作者： Zhang, Mingang Yang, Ding Ge, Yajie Yang, Ming Gao, Xing Zhu, Ruiying Wang, Lin Cao, Yi China Academy of Launch Vehicle Technology Science and Technology on Space Physics Laboratory Beijing China

ISBN: (纸本)9798350303759

In this paper, a trajectory optimization design method based on solid launch vehicle ascent phase trajectory is proposed. We have created a Newton Iteration Method for the best possible trajectory track design and a trajectory program for the vehicle's active stage. The Newton Iteration Method algorithm successfully handles solid rocket trajectory optimization design issues, as shown by analysis and simulation results. It satisfies requirements for separation point inclination, height, and other parameters while optimizing the trajectory path scheme in the ascending trajectory. The technique improves convergence stability and speed, making engineering implementation easier. This work provides a theoretical framework for ascent trajectory optimization design and offers valuable insights for practitioners in the field. © 2023 IEEE.

关键词： Launch vehicles

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