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arXiv 2025年

作者： Luo, Jun Bai, Shaojun Bai, Yan-Zheng Cai, Lin Dang, Hao Dong, Qijia Duan, Hui-Zong Du, Yuanbo Fan, Lei Fu, Xinju Gao, Yong Gou, Xingyu Gu, Defeng Guo, Changlei Hong, Wei Hu, Bin Hu, Heran Hu, Ming Hu, Yi-Ming Huang, Fa Peng Ji, Xin Jiang, Yuan-Ze Li, En-Kun Li, Hongyin Li, Ming Li, Ming Li, Yong Li, Zhu Li, Zizheng Lian, JunXiang Liang, Yu-Rong Lin, Xudong Liu, Jianping Liu, Lin-Xia Liu, Kui Liu, Li Liu, Minghe Liu, Qi Liu, Yan-Chong Liu, Yue Luo, Peng-Shun Luo, Yingxin Ma, Yi-Qiu Ma, Yun Meng, Yunhe Milyukov, Vadim Peng, Jian-Guo Postnov, Konstantin Qu, Shao-Bo Shan, Tilei Shao, Cheng-Gang Shi, Changfu Song, Pei-Yi Song, Yunfei Su, Wei Tan, Ding Yin Tan, Shuping Tan, Yu-Jie Tan, Wenhai Tu, Liangcheng Wang, Cheng-Rui Wang, Guoyong Wang, Lijiao Wang, Pan-Pan Wang, Shun Wang, Xiaoyong Wang, Xudong Wang, Yan Wei, Ran Wu, Shu-Chao Xu, Jie Xu, Zhi-Lin Xue, Chao Yan, Hao Yan, Yong Yang, Changpeng Yang, Shanqing Yeh, Hsien-Chi Yin, Hang Tong, Yelong Yu, Jian-Bo Yuan, Wen-Hao Zhang, Bu-Tian Zhang, Dexuan Zhang, Jian-Dong Zhang, Jie Zhang, Lihua Zhang, Xuefeng Zhao, Guoying Zhao, Liqian Zhao, Xin Zhou, An-Nan Zhou, Hao Zhou, Peng Zhou, Yupeng Zhou, Ze-Bing Zhu, Fan Zhu, Liang-Gui Zhu, Lin Zou, Kui Mei, Jianwei MOE Key Laboratory of TianQin Mission TianQin Research Center for Gravitational Physics School of Physics and Astronomy Frontiers Science Center for TianQin Gravitational Wave Research Center of CNSA Sun Yat-sen University Zhuhai Campus Zhuhai519082 China National Gravitation Laboratory MOE Key Laboratory of Fundamental Physical Quantities Measurement School of Physics Huazhong University of Science and Technology Wuhan430074 China DFH Satellite Co. Ltd. Beijing100094 China Beijing Institute of Space Mechanics & Electricity Beijing100076 China National Key Laboratory of Spacecraft Thermal Control of Institute of Spacecraft System Engineering Beijing100094 China Space Star Technology CO. LTD. Beijing100095 China Beijing Institute of Control Engineering Beijing100094 China School of Artificial Intelligence Sun Yat-sen University Zhuhai Campus Zhuhai519082 China Shanxi Xi’an710199 China Sternberg Astronomical Institute M.V. Lomonosov Moscow State University Moscow119234 Russia Kavli Institute for Astronomy and Astrophysics Peking University Beijing100871 China

TianQin is a future space-based gravitational wave observatory targeting the frequency window of 10−4 Hz ∼ 1 Hz. A large variety of gravitational wave sources are expected in this frequency band, including the merger of massive black hole binaries, the inspiral of extreme/intermediate mass ratio systems, stellar-mass black hole binaries, Galactic compact binaries, and so on. TianQin will consist of three Earth orbiting satellites on nearly identical orbits with orbital radii of about 105 km. The satellites will form a normal triangle constellation whose plane is nearly perpendicular to the ecliptic plane. The TianQin project has been progressing smoothly following the "0123" technology roadmap. In step "0", the TianQin laser ranging station has been constructed and it has successfully ranged to all the five retro-reflectors on the Moon. In step "1", the drag-free control technology has been tested and demonstrated using the TianQin-1 satellite. In step "2", the inter-satellite laser interferometry technology will be tested using the pair of TianQin-2 satellites. The TianQin-2 mission has been officially approved and the satellites will be launched around 2026. In step "3", i.e., the TianQin-3 mission, three identical satellites will be launched around 2035 to form the space-based gravitational wave detector, TianQin, and to start gravitational wave detection in space. © 2025, CC BY.

关键词： Laser interferometry

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Characterization of molten 2LiF–BeF_2 salt impregnated into graphite matrix of fuel elements for thorium molten salt reactor

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Nuclear Science and Techniques 2019年第5期30卷 32-39页

作者： Hong-Xia Xu Jun Lin Ya-Juan Zhong Zhi-Yong Zhu Yu Chen Jian-Dang Liu Bang-Jiao Ye Center for Thorium Molten Salt Reactor System Shanghai Institute of Applied PhysicsChinese Academy of Sciences State Key Laboratory of Particle Detection and Electronics University of Science and Technology of China USTC

The impregnation behavior of molten 2LiF–BeF_2(FLiBe) salt into a graphite matrix of fuel elements for a solid fuel thorium molten salt reactor(TMSR-SF) at pressures varying from 0.4 to 1.0 MPa was studied by mercury intrusion, molten salt impregnation, X-ray diffraction, and scanning electron microscopy *** was found that the entrance pore diameter of the graphite matrix is less than 1.0 μm and the contact angle is about 135°. The threshold impregnation pressure was found to be around 0.6 MPa experimentally, consistent with the predicted value of 0.57 MPa by the Washburn equation. With the increase of pressure from 0.6 to 1.0 MPa, the average weight gain of the matrix increased from 3.05 to 10.48%,corresponding to an impregnation volume increase from 2.74 to 9.40%. The diffraction patterns of FLiBe are found in matrices with high impregnation pressures(0.8 MPa and1.0 MPa). The FLiBe with sizes varying from tens of nanometers to a micrometer mainly occupies the open pores in the graphite matrix. The graphite matrix could inhibit the impregnation of the molten salt in the TMSR-SF with a maximum operation pressure of less than 0.5 MPa.

关键词： keywords Molten salt reactor FLiBe Impregnation Graphite matrix

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Triple-Cladding Ytterbium Doped Fiber for 12 kW Single Module

Triple-Cladding Ytterbium Doped Fiber for 12 kW Single Modul...

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Asia Communications and Photonics Conference and Exhibition (ACP)

作者： Yue Meng Zuying Xu Xudong Shi Yu Li Tianying Liu Can Li Xiao Yan Wei Zheng Heng Wang Jiangang Yu Zhiyong Zhao Ming Tang Optical fiber R&D center Everfoton Technologies Corp oration Limited State Key Laboratory of Optic al Fiber and Cable Manufactu re Technology Yangtze Optical Fibre and Cable Joint Stock Limited Company Wuhan 4 China Optical fiber R&D center Everfoton Technologies Corp oration Limited Wuhan China Wuhan National Lab for Optoelectronics (WNLO) & National Engineering Laboratory for Next Generation Internet Access System School of Optical and Electronic Information Huazhong University of Science and Technology Wuhan China

High power continuous-wave ytterbium-doped fiber lasers have unique advantages such as high electro-optical efficiency, excellent beam quality and good thermal management, and are widely used in industrial materials processing and scientific research. However, multi-kW $(\geqslant$ 10kW) high-power fiber lasers has encountered numerous technology challenges in double-cladding fibers. In this work, we designed and fabricated a triple-cladding ytterbium doped fiber with large core diameter by using Modified Chemical Vapor Deposition (MCVD) combined with all-gas-phase doping method. An excellent laser performance could be demonstrated for such a fiber with an output power of more than 10 kW and a slope efficiency of 82%, no Transverse Mode instability (TMI) is observed. Long-term laser stability at 12 kW-level was carried out in a master oscillator power amplifier (MOPA) laser system for 500 hours with power degradation less than 1%, meanwhile a stimulated Raman scattering (SRS) suppression ratio that is larger than 45dB was obtained.

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Influence of pollution chemical components on AC flashover performance of various types of insulators

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High Voltage 2019年第2期4卷 105-112页

作者： Zhongyi Yang Xingliang Jiang Xingbo Han Zhijin Zhang Jianlin Hu State Key Laboratory of Power Transmission Equipment&System Security and New Technology School of Electrical EngineeringChongqing UniversityShapingba DistrictChongqing400044People's Republic of China

The pollution on insulators is composed of various chemical components,which threaten the stability of external ***,the existing insulation designs have not taken this issue into *** work aimed to study the influence of pollution chemical components on flashover performance of insulators with various *** tests of porcelain,glass and silicone rubber insulators polluted by eight types of common contaminants were *** on the test data,the influence of chemical components and their solubility on equivalent salt deposit density(ESDD)and insulator flashover performance were analysed;and the electrical properties of different types of insulators were *** show that the ESDD contribution rate changes with chemical *** dissolution characteristic has a significant influence on the measurement of ESDD;slightly soluble contaminants need to be considered *** corresponding insulator flashover gradient for ions can be summarised as Cl^(−)

关键词： pollution insulator flash

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A Green Synthesis of Ru Modified g-C_(3)N_(4) Nanosheets for Enhanced Photocatalytic Ammonia Synthesis

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Energy Material Advances 2021年第1期2021卷 78-89页

作者： Derek Hao Jiawei Ren Ying Wang Hamidreza Arandiyan Magnus Garbrecht Xiaojuan Bai Ho Kyong Shon Wei Wei Bing-Jie Ni Centre for Technology in Water and Wastewater(CTWW) School of Civil and Environmental EngineeringUniversity of Technology Sydney(UTS)SydneyNSW 2007Australia State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China Laboratory of Advanced Catalysis for Sustainability School of ChemistryThe University of SydneySydney 2006Australia Centre for Advanced Materials&Industrial Chemistry(CAMIC) School of ScienceRMIT UniversityMelbourneVIC 3000Australia Australian Centre for Microscopy and Microanalysis The University of SydneySydney 2006Australia Beijing Engineering Research Center of Sustainable Urban Sewage System Construction and Risk Control Beijing University of Civil Engineering and ArchitectureBeijing 102612China

Nitrate is a crucial environmental pollutant,and its risk on ecosystem keeps *** conversion of nitrate to ammonia can simultaneously achieve the commercialization of environmental hazards and recovery of valuable ammonia,which is green and sustainable for the ***,due to the thermodynamic and kinetic energy barriers,photocatalytic nitrate reduction usually involves a higher selectivity of the formation of nitrogen that largely limits the ammonia synthesis *** this work,we reported a green and facile synthesis of novel metallic ruthenium particle modified graphitic carbon nitride *** with bulk graphitic carbon nitride,the optimal sample had 2.93-fold photocatalytic nitrate reduction to ammonia activity(2.627 mg/h/gcat),and the NH3 selectivity increased from 50.77%to 77.9%.According to the experimental and calculated results,the enhanced photocatalytic performance is attributed to the stronger light absorption,nitrate adsorption,and lower energy barrier for the generation of *** work may provide a facile way to prepare metal modified photocatalysts to achieve highly efficient nitrate reduction to ammonia.

关键词： ammonia nitrate selectivity

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Nonlinear dynamics of rotor-support-casing system with support looseness fault

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International Journal of Mechanical Sciences 2025年 300卷

作者： Wenpeng Jiang Kaikai Liu Xin Yuan Hongrui Cao Jianghai Shi Qinghua Qin School of Mechanical Engineering Xi’an Jiaotong University Xi’an 710049 PR China National Key Lab of Aerospace Power System and Plasma Technology Xi’an Jiaotong University Xi’an 710049 PR China Xi’an Key Laboratory of Extreme Environment and Protective Technology State Key Laboratory for Strength and Vibration of Mechanical Structures Xi’an Jiaotong University Xi’an 710049 PR China

This paper proposes a time-domain numerical method combining explicit and implicit schemes for efficiently solving high-dimensional systems with localized nonlinearities. This method is applied to investigate the nonlinear dynamic characteristics of a rotor-support-casing system with support looseness fault. A dynamic model incorporating multi-interface nonlinear supports is developed, which includes nonlinear bearings, a squeeze film damper (SFD), and the contact interaction between the bearing and its housing. The model is validated through modal testing and vibration response experiments. To obtain the vibration response of the system, a hybrid numerical integration method is proposed, with its core focused on optimizing the iterative solution process. This method separates the linear and nonlinear parts of the system, predicts the coupling node response using an explicit scheme, and solves the linear and nonlinear parts using an implicit numerical method and a quasi-Newton iterative algorithm, respectively. Compared with conventional approaches, this method significantly improves computational efficiency. Subsequently, the effects of rotor speed, fit clearance, and oil film clearance in SFD on the dynamic response of the rotor-support-casing system under support looseness faults are investigated. The results show that support looseness alters system stability, leading to periodic, multi-periodic, and quasi-periodic responses. Both fit clearance and oil film clearance significantly influence the system’s nonlinear behavior. Under serious fault conditions, fractional-order rotational speed harmonics appear in the casing vibration response. The proposed modeling approach and hybrid numerical method demonstrate strong potential for engineering applications in aero-engine vibration prediction.

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Controlled Propulsion of Asymmetric Janus Microdimer Swimmers under Rotating Magnetic Fields

Controlled Propulsion of Asymmetric Janus Microdimer Swimmer...

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IEEE Conference on Industrial Electronics and Applications (ICIEA)

作者： Shimin Yu Tianlong Li Shaopeng Wu State Key Laboratory of Robotics and System Harbin Institute of Technology Harbin China Harbin Institute of Technology Harbin China

ISBN: (数字)9781728151694

ISBN: (纸本)9781728151700

Untethered micro-/nanorobots at low Reynolds numbers present significant potential in biomedical applications as result of their enhanced power, remote actuation, and versatility. Herein, a highly efficient asymmetric Janus microdimer swimmer propelled by a rotating uniform magnetic field was investigated experimentally. The asymmetric microdimers can achieve speed of 98 μm·s -1 at 20 Hz and 5 mT. Besides, the controllable and flexible motility performance of microdimer motors can be easily obtained by adjusting the magnetic field. Such an asymmetric Janus microdimer swimmer is highly promising in a variety of realistic micro-/nanoscale scenarios.

关键词： Industrial electronics Navigation Conferences Propulsion Nanoscale devices Trajectory Magnetic fields

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Modeling Method and Application of Rational Finite Element Based on Absolute Nodal Coordinate Formulation

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Acta Mechanica Solida Sinica 2018年第2期31卷 207-228页

作者： Chao Ma Cheng Wei Jing Sun Bin Liu Beijing Key Laboratory of Intelligent Space Robotic Systems Technology and Applications Beijing Institute of Spacecraft System Engineering Department of Aerospace Engineering Harbin Institute of Technology

In multibody system dynamics, the absolute nodal coordinate formulation （ANCF） uses power functions as interpolating polynomials to describe the displacement field. It can get accurate results for flexible bodies that undergo large deformation and large rotation. However, the power functions are irrational representation which cannot describe the complex shapes precisely, especially for circular and conic sections. Different from the ANCF representation, the rational absolute nodal coordinate formulation （RANCF） utilizes rational basis functions to describe geometric shapes, which allows the accurate representation of complicated displacement and deformation in dynamics modeling. In this paper, the relationships between the rational surface and volume and the RANCF finite element are provided, and the generalized transformation matrices are established correspondingly. Using these transformation matrices, a new four-node three-dimensional RANCF plate element and a new eight-node three-dimensional RANCF solid element are proposed based on the RANCF. Numerical examples are given to demonstrate the applicability of the proposed elements. It is shown that the proposed elements can depict the geometric characteristics and structure configurations precisely, and lead to better convergence in comparison with the ANCF finite elements for the dynamic analysis of flexible bodies.

关键词： Multibody system dynamics Absolute nodal coordinate formulation Flexible deformation Spline representation Rational finite element

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Preparation and spectral properties of blue-to-UVB upconverting Y 2 O 3 :RE 3+ ,Gd 3+ (RE = Er, Ho) micro-/nano-phosphors

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Journal of Rare Earths 2025年

作者： Dechao Yu Xiaoshan Zhang Arend Zhang Xinxin Han Enhai Song Dawei Zhang Engineering Research Center of Optical Instrument and System The Ministry of Education Shanghai Key Laboratory of Modern Optical System University of Shanghai for Science and Technology Shanghai 200093 China Condensed Matter and Interfaces Debye Institute for Nanomaterials Science Utrecht University Princetonplein 5 3584 CC Utrecht The Netherlands MOE Key Laboratory of New Processing Technology for Non-ferrous Metals and Materials Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials Guangxi University Nanning 530004 China State Key Laboratory of Luminescent Materials and Devices School of Materials Science and Engineering South China University of Technology Guangzhou 510641 China

Phototherapeutic applications gain more and more interests and require fundamental progresses in interdisciplinarity research, particularly a novel topical phototherapy using ultraviolet-B (UVB, ∼310 nm) upconverting phosphors. In this study, three synthesis methods with(out) sintering processes were implemented to obtain micro-/nano-size Y 2 O 3 :RE 3+ /Gd 3+ (RE = Er, Ho) particles using RE oxides (RE 2 O 3 ), RE-nitrates (RE(NO 3 ) 3 ) and RE-chlorides (RECl 3 ) as starting materials. Pumped by an OPO laser at wavelengths of 450 and/or 490 nm, blue-to-UVB upconversion with narrowband peak at 313 nm was effectively realized for all the Y 2 O 3 :RE 3+ /Gd 3+ powder phosphors. On basis of theoretical speculations and experimental data, a two-photon absorption process was proposed for the UVB upconversion of Y 2 O 3 :RE 3+ /Gd 3+ . Moreover, the involved energy transfer (ET) from RE 3+ to Gd 3+ , its back ET mechanisms as well as cross-relaxation between RE 3+ (RE = Er, Ho) ions were systematically treated versus the Er 3+ - or Ho 3+ -, and Gd 3+ -doping concentration. Note that the UVB upconversion intensity will decline severely as the particles become smaller to submicron and nanoscale, likely due to an increasing surface-to-volume ratio along with more surface defects appearance. All these results would greatly promote the development of novel blue-to-UVB upconverting materials, and their potential applications in topical phototherapy irradiated by blue light source.

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Non-Cooperative Differential Game Based Energy Consumption Control for Dynamic Demand Response in Smart Grid

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China Communications 2019年第8期16卷 107-114页

作者： Manxi Wang Haitao Xu Shengsong Yang Lifeng Yang Ruifeng Duan Xianwei Zhou State Key Laboratory of Complex Electromagnetic Environment Effects on Electronics and Information System Luoyang 471003China School of Computer and Communication Engineering University of Science and Technology BeijingBeijing 100083China

In this paper, we conduct research on the dynamic demand response problem in smart grid to control the energy consumption. The objective of the energy consumption control is constructed based on differential game, as the dynamic of each users’ energy state in smart gird can be described based on a differential equation. Concept of electricity sharing is introduced to achieve load shift of main users from the high price hours to the low price hours. Nash equilibrium is given based on the Hamilton equation and the effectiveness of the proposed model is verified based on the numerical simulation results.

关键词： energy consumption dynamic demand response smart grid differential game nash equilibrium

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