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arXiv 2024年

作者： Tang, Haijun Huang, Can Wang, Yuhan Jiang, Xiong Xiao, Shumin Han, Jiecai Song, Qinghai Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System Guangdong Provincial Key Laboratory of Semiconductor Optoelectronic Materials and Intelligent Photonic Systems Harbin Institute of Technology Shenzhen518055 China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin150080 China Pengcheng Laboratory Shenzhen518055 China Collaborative Innovation Center of Extreme Optics Shanxi University Shanxi Taiyuan030006 China

Distant interactions at arbitrary locations and their dynamic control are fundamentally important for realizing large-scale photonic and quantum circuits. Conventional approaches suffer from short coupling distance, poor controllability, fixed locations and low wavelength uniformity, significantly restricting the scalability of photonic and quantum networks. Here, we exploit the intrinsic advantages of optical bound state in the continuum (BIC) and demonstrate an all-in-one solution for dynamically controllable long-range interactions. BIC metasurface can support a series of finite-sized quasi-BIC microlasers at arbitrary locations. The quasi-BICs microlasers have the same wavelength and are inherently connected through BIC waveguide. Consequently, the coupling distances in experiment increase significantly from subwavelength to tens of micrometers. Such long-range interaction in BIC metasurface enables scaling to two-dimensional architectures and ultrafast control of internal laser actions, e.g., non-Hermitian zero-mode lasing and enhanced optical gain. This research shall facilitate the advancement of scalable and reconfigurable photonic networks. © 2024, CC BY.

关键词： Location

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Unconventional superconductivity in magic-strain graphene superlattices

arXiv

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arXiv 2024年

作者： Ji, Qingxiang Li, Bohan Christensen, Johan Wang, Changguo Kadic, Muamer National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin150001 China IMDEA Materials Institute Calle Eric Kandel 2 Getafe Madrid28906 Spain Université de Franche-Comté Institut FEMTO-ST CNRS Besançon25000 France

Extensive investigations on the Moiré magic-angle have been conducted in twisted bilayer graphene, unlocking the mystery of unconventional superconductivity and insulating states. In analog to magic angle, here we demonstrate the new concept of magic-strain in graphene systems by judiciously tailoring mechanical relaxation (stretch and compression) which is easier to implement in practice. We elucidate the interplay of strain-induced effects and delve into the resulting unconventional superconductivity or semimetal-insulator transition in relaxation-strained graphene, going beyond the traditional twisting approach. Our findings reveal how relaxation strain can trigger superconducting transitions (with an ultra-flat band at the Fermi level) or the semimetal-insulator transition (with a gap opening at the K point of 0.39 eV) in both monolayer and bilayer graphene. These discoveries open up a new branch for correlated phenomena and provide deeper insights into the underlying physics of superconductors, which positions graphene as a highly tunable platform for novel electronic applications. © 2024, CC BY.

关键词： Strain relaxation

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Cold Sintering of Lunar Regolith Simulant: An Energy-Efficient and High-Reliable Strategy for Building Lunar Bases

SSRN

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SSRN 2023年

作者： Liu, Zhen Li, Jinping Yang, Cheng Wang, Xiaofei Xiao, Jie Wang, Lishuang Meng, Songhe National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin150080 China School of Chemistry and Chemical Engineering Shandong University of Technology Zibo255049 China Power Machinery Institute of Inner Mongolia Hohhot010010 China

Sintering lunar regolith simulants as building materials is an effective method to establish permanent lunar bases. However, the high energy consumption of conventional thermal sintering is a challenge for energy-scarce lunars. Cold sintering process (CSP), a process capable of densifying ceramics at low temperatures, is an energy-efficient method. The lunar regolith simulant was densified using CSP at 150 °C, 200 MPa, and 15 wt. % 10 mol NaOH for 90 min. The density and compressive strength of the samples reach 2.44 g/cm3 and 207 MPa, respectively. The strengths of the samples at -150 °C and 150 °C were 203 and 191 MPa, respectively, indicating that the samples maintained high reliability in a simulated lunar environment. This excellent performance is attributed to the NaOH solution dissolving the oxide clusters on the particle surface, and the precipitation-generated glass phase connecting adjacent particles, making the particles sintered and densified. Furthermore, the energy consumption of CSP equipment is only 0.86 kW·h, which is 6.66 times lower than that of conventional thermal sintering (5.73 kW·h). Therefore, this study provides a new energy-efficient and high-reliable strategy for building lunar bases. © 2023, The Authors. All rights reserved.

关键词： Energy utilization

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Ultrathin, Lightweight, and Flexible CNT Buckypaper Enhanced Using MXenes for Electromagnetic Interference Shielding

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Nano-Micro Letters 2021年第4期13卷 208-220页

作者： Rongliang Yang Xuchun Gui Li Yao Qingmei Hu Leilei Yang Hao Zhang Yongtao Yao Hui Mei Zikang Tang State Key Laboratory of Optoelectronic Materials and Technologies School of Electronics and Information TechnologySun Yat-Sen UniversityGuangzhou 510275People’s Republic of China Science and Technology on Thermostructural Composite Materials Laboratory School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072ShaanxiPeople’s Republic of China Instrumental Analysis and Research Center(IARC) Sun Yat-Sen UniversityGuangzhou 510275People’s Republic of China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150080People’s Republic of China Institute of Applied Physics and Materials Engineering University of MacaoTaipa 999078MacaoPeople’s Republic of China

Lightweight,flexibility,and low thickness are urgent requirements for next-generation high-performance electromagnetic interference(EMI)shielding materials for catering to the demand for smart and wearable electronic *** several efforts have focused on constructing porous and flexible conductive films or aerogels,few studies have achieved a balance in terms of density,thickness,flexibility,and EMI shielding effectiveness(SE).Herein,an ultrathin,lightweight,and flexible carbon nanotube(CNT)buckypaper enhanced using MXenes(Ti3C2Tx)for high-performance EMI shielding is synthesized through a facile electrophoretic deposition *** obtained Ti3C2Tx@CNT hybrid buckypaper exhibits an outstanding EMI SE of 60.5 dB in the X-band at 100μ*** hybrid buckypaper with an MXene content of 49.4 wt%exhibits an EMI SE of 50.4 dB in the X-band with a thickness of only 15μm,which is 105%higher than that of pristine CNT ***,an average specific SE value of 5.7×10^(4) dB cm^(2) g^(−1) is exhibited in the 5-μm hybrid ***,this assembly process proves promising for the construction of ultrathin,flexible,and high-performance EMI shielding films for application in electronic devices and wireless communications.

关键词： Carbon nanotube MXene Buckypaper Electromagnetic interference shielding

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An experimental study of ultra-high temperature ceramics under tension subject to an environment with elevated temperature,mechanical stress and oxygen

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science China(Technological sciences) 2019年第8期62卷 1349-1356页

作者： HAN XinXing XU ChengHai JIN Hua XIE WeiHua MENG SongHe National Key Laboratory of Science and Technology for National Defence on Advanced Composites in Special Environments Harbin Institute of Technology

Ultra-high temperature ceramic(UHTC) composites are widely used in high-temperature environments in aerospace applications. They experience extremely complex environmental conditions during service, including thermal, mechanical and chemical loading. Therefore, it is critical to evaluate the mechanical properties of UHTCs subject to an environment with elevated temperature, mechanical stress and oxygen. In this paper, an experimental investigation of the uniaxial tensile properties of a ZrB_2-SiC-graphite subject to an environment with a simultaneously elevated temperature, mechanical stress and oxygen is conducted based on a high-temperature mechanical testing system. To improve efficiency, an orthogonal experimental design is used. It is suggested that the temperature has the most important effect on the properties, and the oxidation time and stress have an almost equal effect. Finally, the fracture morphology is characterized using scanning electron microscopy(SEM), and the mechanism is investigated. It was concluded that the main fracture mode involved graphite flakes pulling out of the matrix and crystalline fracture, which indicates the presence of a weak interface in the composites.

关键词： ultra-high temperature ceramics environment with elevated temperature mechanical stress and oxygen uniaxial tensile strength orthogonal experimental design

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Cold Sintering: A Promising in Situ Resource Utilisation Strategy to Densify Lunar Regolith Simulants for Construction Applications

SSRN

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SSRN 2023年

Sintering lunar regolith simulants as building materials is an effective method to establish long-term lunar bases. However, the high energy consumption of conventional thermal sintering is a challenge for energy-scarce lunars. The cold sintering process (CSP), which densifies ceramics with the assistance of transient solvent, offers a solution to overcome the aforementioned problems. Utilizing the CSP at 150 °C, 200 MPa, and 15 wt% 10 mol NaOH for 90 min, the density and compressive strength of the samples reached 2.44 g/cm3 and 207 MPa, respectively. The energy consumption of CSP equipment is only 0.86 kW·h, which is 6.66 times lower than that of conventional thermal sintering (5.73 kW·h). Furthermore, the compressive strength of the samples after three cool-heat cycles temperature between -196 °C and 150 °C was 205 MPa, indicating that the samples maintained high reliability in a simulated lunar environment. This excellent performance is attributed to the NaOH solution dissolving the oxide clusters on the particle surface, and the precipitation-generated glass phase connecting adjacent particles, making the particles consolidated and densified. Therefore, the cold sintering process presents promising prospects for the energy-efficient fabrication of lunar construction materials with excellent mechanical strength and durability. © 2023, The Authors. All rights reserved.

关键词： Energy utilization

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Direct observation of chaotic resonances in optical microcavities

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Light(science & Applications) 2021年第8期10卷 1455-1461页

作者： Shuai Wang Shuai Liu Yilin Liu Shumin Xiao Zi Wang Yubin Fan Jiecai Han Li Ge Qinghai Song Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System Harbin Institute of Technology(Shenzhen)Shenzhen 518055China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150080China. Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China. Department of Physics and Astronomy College of Staten IslandCUNYStaten IslandNY 10314USA. The Graduate Center CUNYNew YorkNY 10016USA

Optical microcavities play a significant role in the study of classical and quantum *** date,most experimental explorations of their internal wave dynamics have focused on the properties of their inputs and outputs,without directly interrogating the dynamics and the associated mode patterns *** a result,this key information is rarely retrieved with certainty,which significantly restricts the verification and understanding of the actual chaotic *** we demonstrate a simple and robust approach to directly and rapidly map the internal mode patterns in chaotic *** introducing a local index perturbation through a pump laser,we report a spectral response of optical microcavities that is proportional to the internal field *** this technique,chaotic modes with staggered mode spacings can be ***,a complete chaos assisted tunneling(CAT)and its time-reversed process are experimentally verified in the optical domain with unprecedented certainty.

关键词： motion chaotic reversed

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Simulation Analysis of A Cable-Driven Astronaut on-Orbit Physical Exercise Equipment

Simulation Analysis of A Cable-Driven Astronaut on-Orbit Phy...

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International Conference on Autonomous Robots and Agents, ICARA

作者： Lailu Li Lixun Zhang Bing Wang Da Song National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin China College of Mechanical and Electrical Engineering Harbin Engineering University Harbin China School of Mechanical Engineering Northeast Electric Power University Jilin China

It has been proved by aerospace medicine that physical exercises are the most effective countermeasure to eliminate the negative influence brought by microgravity when astronauts carry out space exploration missions. A cable-driven astronaut on-orbit physical exercise equipment (CAPE) is proposed in this paper, and to verify its feasibility and performance: First, the cable-driven astronaut on-orbit physical exercise equipment was introduced. Second, the force analysis of the CAPE-assisted deep squat was conducted, and the cable tension distribution strategy was established. Third, the simulation study was carried out by utilizing Matlab. The results demonstrate that the deep squat conducted by the CAPE is smooth and steady, the cable tension distribution strategy is accurate, astronaut can realize deep squat during a space trip with the assistance of CAPE.

关键词： Analytical models Presses Power cables Distribution strategy Real-time systems Space exploration Reliability

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Quasi bound states in the continuum empowered intrinsically chiral emission

Quasi bound states in the continuum empowered intrinsically ...

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Frontiers in Optics, FiO 2022

作者： Zhang, Xudong Liu, Yilin Han, Jiecai Kivshar, Yuri Song, Qinghai Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System Harbin Institute of Technology Shenzhen518055 China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin150080 China Nonlinear Physics Center Research School of Physics Australian National University CanberraACT2601 Australia Pengcheng Laboratory Shenzhen518055 China Collaborative Innovation Center of Extreme Optics Shanxi University Shanxi Taiyuan030006 China

By utilizing the physics of chiral quasi-bound states in the continuum (BICs) which breaking out-of-plane symmetry by slant meta-atoms, an ultracompact source with controllable spectrum, radiation pattern and spin ang...

ISBN: (纸本)9781557528209

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Micro and nanolattice fabrication using projection micro litho stereo exposure additive manufacturing techniques and synchrotron X-ray 3D imaging-based defect characterization

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science China(Technological sciences) 2020年第4期63卷 561-570页

作者： HU WenXia LIU LiWu WU WenWang XI Li LENG JinSong FANG DaiNing Institute of Advanced Structure Technology Beijing Institute of TechnologyBeijing 100081China Department of Astronautical Science and Mechanics Harbin Institute of TechnologyHarbin 150001China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology(HIT)Harbin 150080China Department of Mechanical Engineering Massachusetts Institute of TechnologyCambridge MA 02139USA

Synchrotron radiation X-ray micro-computed tomography(SR-μCT)is a 3D imaging technique that is widely employed for the characterization of defects in advanced materials and *** this study,we characterize several typical defects in octettruss and re-entrant 3D lattice structures by using SR-μ*** 3D micro-lattice structures are manufactured using projection micro litho stereo exposure(PμLSE)additive manufacturing *** as-fabricated 3D lattice samples are characterized using optical microscopy,and subsequently,by SR-μ*** more,a statistical analysis is performed to characterize the surface roughness and internal defects qualitatively,whereby the statistical geometrical parameters of struts along different directions and strut joints are analyzed and ***,several typical defects are identified:(1)holes at the joints of the strut and irregular diameter deviations of the strut in the octet-truss lattice structure;(2)irregular diameter variations,bulges,dislocations,grooves,accumulations,and torsion in the re-entrant lattice *** of these defects are related to the building direction,the weight of the structure,bubbles,dust,and impurities during the PμLSE additive manufacturing process.

关键词： synchrotron radiation X-ray additive manufacturing lattice structures defect characterization

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