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Application of high-pressure technology in exploring mechanical properties of high-entropy alloys

Tungsten 2023年第1期5卷 50-66页

作者： Shu-Cong Li Qing-Lin Wang Yu Yao Dan-Dan Sang Hai-Wa Zhang Guo-Zhao Zhang Cong Wang Cai-Long Liu Shandong Key Laboratory of Optical Communication Science and Technology School of Physics Science&Information TechnologyLiaocheng UniversityLiaocheng 252059China College of Mathematics and Physics Beijing University of Chemical TechnologyBeijing 100029China

In recent years,high-entropy alloys(HEAs) have developed a lot as the new style of materials,which have become a research focus in the materials *** breaks the normal procedure of traditional alloy design(based on one/two elements as the main component,and adds some other elements to improve the micro structure and required related performance of the alloy),and consists of five or more equal or nearly equal elements,with multiple principal ***,HEAs have many excellent mechanical properties compared with traditional alloys,which have aroused great research interest of *** rapid development of high-pressure technology makes it a powerful tool to modulate the structures of HEAs,and brings new chance for the study and optimization of mechanical properties of *** this paper,the application of high-pressure technology in exploring and improving the mechanical properties of HEAs is reviewed,which could deepen the understanding of high-pressure technology and provide a new avenue for further exploration of HEAs’ mechanical properties.

关键词： High-entropy alloys Mechanical properties High-pressure torsion High-pressure Diamond anvil cells

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Development of electromagnetic pellet injector for disruption mitigation of tokamak plasma

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Chinese physics B 2023年第7期32卷 29-36页

作者：李峰陈忠勇夏胜国严伟张维康唐俊辉李由钟昱方建港刘凡溪邹癸南喻寅龙聂子森江中和王能超丁永华潘垣 J-TEXT team International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and TechnologySchool of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China Key Laboratory of Pulsed Power Technology Ministry of Education Huazhong University of Science and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China

Disruption remains to be a serious threat to large tokamaks like the International Thermonuclear Experimental Reactor(ITER).The injection speed of disruption mitigation systems(DMS)driven by high pressure gas is limited by the sound speed of the propellant *** extrapolating to ITER-like tokamaks,long overall reaction duration and shallow penetration depth due to low injection speed make it stricter for plasma control system to predict the impending *** disruptions with a short warning time may be ***,a fast time response and high injection speed DMS is essential for large scale *** electromagnetic pellet-injection(EMPI)system is a novel massive material injection system aiming to provide rapid and effective disruption *** on the railgun concept,EMPI can accelerate the payload to over 1000 m/s and shorten the overall reaction time to a few *** verify the injection ability and stability of the EMPI,the prototype injector EMPI-1 has been designed and *** preliminary test has been carried out using a 5.9 g armature to propel a dummy pellet and the results suggest that the EMPI configuration has a great potential to be the DMS of the large scale fusion devices.

关键词： tokamak disruption mitigation system electromagnetic pellet-injection(EMPI)

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A Large-Scale Scheduling Method for Multiple Agile Optical Satellites

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Computer Modeling in Engineering & sciences 2023年第8期136卷 1143-1163页

作者： Zheng Liu Wei Xiong Minghui Xiong Science and Technology on Complex Electronic System Simulation Laboratory Space Engineering UniversityBeijing101416China

This study investigates the scheduling problem ofmultiple agile optical satelliteswith large-scale *** problem is difficult to solve owing to the time-dependent characteristic of agile optical satellites,complex constraints,and considerable solution *** solve the problem,we propose a scheduling method based on an improved sine and cosine algorithm and a task merging *** first establish a scheduling model with task merging constraints and observation action constraints to describe the ***,an improved sine and cosine algorithm is proposed to search for the optimal solution with the maximum profit *** adaptive cosine factor and an adaptive greedy factor are adopted to improve the ***,a taskmerging method with a task reallocation mechanism is developed to improve the scheduling *** results demonstrate the superiority of the proposed algorithm over the comparison algorithms.

关键词： Multiple agile optical satellites scheduling task merging sine and cosine algorithm task reallocation

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Sparse Gaussian Splatting: Dynamic Spatial Sparsification Gaussian Splatting Based on Hash Multi - Resolution Grid 10

Sparse Gaussian Splatting: Dynamic Spatial Sparsification Ga...

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10th International Conference on Systems and Informatics, ICSAI 2024

作者： Yu, Wenjie Ding, Yan Zhang, Bozhi Liang, Weidong Zhu, Xiujuan School of Aerospace Engineering Beijing Institute of Technology Beijing China China Academy of Launch Vehicle Technology Science and technology on space physics laboratory Beijing China

ISBN: (纸本)9798331510138

3D Gaussian splatting has brought a new technological revolution to novel view synthesis, achieving real-time rendering, high-quality rendering quality, and fast model training. However, 3DGS has a phenomenon of memory waste in verification, which makes it difficult to be applied on small embedded platforms such as UAV. To address this critical issue, we analyze the main causes of this problem from two perspectives of primitive parameters and primitive distribution and propose three solutions: limiting primitive generation, redundant primitive elimination, and spherical harmonic function pruning. First, we design a constraint function in the covariance scale space of Gaussian primitives. Through large gradients and shape constraints, it affects the shape and spacing of primitive generation, accelerates the iteration speed and reduces the appearance of needle-like artifact primitives. Secondly, during the iteration process, we perform fast multi-resolution hash grid coding on the overall model and calculates the cross-redundancy of each primitive, and adaptively eliminates primitives with high redundancy. Finally, based on the 3DGS rendering function of variable spherical harmonics, we validate the isotropy and high-order spherical harmonic order of the visible surface of primitives and performs adaptive pruning of spherical harmonic parameters. Incorporating all the schemes, we finally achieve a reduction of 70% in the total memory size of the test data set model with almost no drop in model quality, and successfully realizes fast rendering of scenes on mobile devices. © 2024 IEEE.

关键词： Spheres

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Mitigating the negative catalytic effect of CuO by FAS-17 coated Al nanopowder:Isothermal ageing of Al/CuO nanothermite at 71°C and 60%relative humidity

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Defence technology（防务技术） 2024年第4期34卷 156-167页

作者： Fuwei Li Qian Wang Jian Cheng Zehua Zhang Yuxuan Zhou Keer Ouyang Jianbing Xu Yinghua Ye Ruiqi Shen School of Chemistry and Chemical Engineering Nanjing University of Science&TechnologyNanjing 210094China Micro-Nano Energetic Devices Key Laboratory Ministry of Industry and Information TechnologyNanjing 210094JiangsuChina Institute of Space Propulsion Nanjing University of Science and TechnologyNanjing 210094China

The safety and reliability of weapon systems would be significantly affected by changes in the performance of energetic materials due to ambient temperature and *** have promising applications due to their excellent *** it becomes extremely important to understand their aging and failure process in the environment before using ***,the aging and failure process of Al/CuO in 71°C/60%RH were investigated,and showed that CuO nanoparticles negatively catalyze Al nanopowders,resulting in rapid *** anti-aging effect of FAS-17-coated Al nanopowder was also *** aging process of Al,Al/CuO,and Al@FAS-17/CuO in high humidity and heat environment were revealed by quasi-in situ SEM and TEM *** with the aging of pure Al,the Al nanopowder in the nanothermites strongly agglomerated with the CuO nanopowder and hydrated *** may be caused by CuO catalyzed hydration of Al *** energy release experiments showed that the performance of Al/CuO decreased rapidly and failed to ignite after 4 h of *** contrast,the Al@FAS-17/CuO thermite can achieve long-term stability of up to 60 h in the same environment by simple cladding of *** is found that FAS-17 coated Al nanopowder can prevent both particle agglomeration and water erosion,which is an effective means to make nanothermites application in high humidity and heat environment.

关键词： Al/CuO nanothermite FAS-17 coating Aging and failure process

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Mechanical property and thermal shock behavior of tungsten-yttria-stabilized zirconia cermet fabricated by spark plasma sintering

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Tungsten 2024年第1期6卷 134-140页

作者： Lin-Chao Zhang Ke Jing Rui Liu Zhuo-Ming Xie Jun-Feng Yang Gang Li Xian-Ping Wang Xue-Bang Wu Qian-Feng Fang Chang-Song Liu Key Laboratory of Materials Physics Institute of Solid State PhysicsHFIPSChinese Academy of SciencesHefei 230031China University of Science and Technology of China Hefei 230026China Science and Technology on Reactor Fuel and Materials Laboratory Nuclear Power Institute of ChinaChengdu 610041China

The cermet fuels have been considered as a potential key component for the nuclear thermal propulsion,and the homogeneity of the fuel particles in the metal matrix plays a crucial role in stabilizing the structure at extremely high *** this work,liquid paraffin was used as additive to improve the distribution of yttria-stabilized zirconia(YSZ,an appropriate surrogate for UO_(2) fuel)microspheres in the tungsten(W)matrix,and the W-YSZ cermet wafers(volume ratio 1:1)with a relative density of 97.6%were fabricated by spark plasma sintering with a specifically designed *** effects of the paraffin dosage(0-5 wt.%)on the homogeneity,microstructure,mechanical properties,and the thermal conductivity of W-YSZ cermet were *** W-YSZ sample with 2 wt.%paraffin shows the highest homogeneity and exhibits the best comprehensive properties,including the ultimate tensile strength of 132.2 MPa at 600℃,the bending strength of455 MPa and thermal conductivity of 50 W·m^(-1)·K^(-1)at room ***,the cermet could keep structurally sound after thermal shocked at a heat load of 20 MW·m^(-2).These results would be helpful for the design and optimization of the cermet fuels in the nuclear thermal propulsion.

关键词： Nuclear thermal propulsion Tungsten Cermet Liquid paraffin Thermal shock

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In-plane spin excitation of skyrmion bags

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Chinese physics B 2023年第11期32卷 585-590页

作者：李爽李可欣刘照华朱起源赵晨博张虎石兴强王江龙王瑞宁连如乾巩朋来金晨东 Key Laboratory of Optic-Electronic Information and Materials of Hebei Province Research Center for Computational PhysicsCollege of Physics Science and TechnologyHebei UniversityBaoding 071002China College of Mathematics and Physics Chongqing University of Science and TechnologyChongqing 401331China Department of Materials Science and Engineering Lanzhou University of TechnologyLanzhou 730050China

Skyrmion bags are spin structures with arbitrary topological charges, each of which is composed of a big skyrmion and several small skyrmions. In this work, by using an in-plane alternating current(AC) magnetic field, we investigate the spinwave modes of skyrmion bags, which behave differently from the clockwise(CW) rotation mode and the counterclockwise(CCW) rotation mode of skyrmions because of their complex spin topological structures. The in-plane excitation power spectral density shows that each skyrmion bag possesses four resonance frequencies. By further studying the spin dynamics of a skyrmion bag at each resonance frequency, the four spin-wave modes, i.e., a CCW-CW mode, two CW-breathing modes with different resonance strengths, and an inner CCW mode, appear as a composition mode of outer skyrmion–inner skyrmions. Our results are helpful in understanding the in-plane spin excitation of skyrmion bags, which may contribute to the characterization and detection of skyrmion bags, as well as the applications in logic devices.

关键词： skyrmion bags spin-wave mode power spectral density micromagnetic simulation

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Enhanced N_(2)electroreduction activity of single-atom catalysts:Modulating the linear scaling relationship by coordination engineering and dual-site strategies

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Nano Research 2025年第3期18卷 696-709页

作者： Renyi Li Caimu Wang Jiao Zhang Wei Guo Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement(MOE)School of PhysicsBeijing Institute of TechnologyBeijing 100081China Frontiers Science Center for High Energy Material(MOE) Beijing Institute of TechnologyBeijing 100081China

The volcano plot is widely used to elucidate the activity trends among different catalysts,thereby effectively screening and guiding catalyst ***,the inherent linear scaling relationship(LSR)constrains the breakthrough in the activity of catalysts,and the understanding of the activity limit in volcano plot is still *** this work,by employing first-principles calculations and microkinetic modeling,we proposed coordination engineering(CE)and dual-site(DS)strategies to surpass the Sabatier’s limitation of WS_(2)-supported TM(TM@WS_(2))single-atom catalysts(SACs)for electrocatalytic nitrogen reduction reaction(eNRR).We found that the LSR betweenΔG(^(*)N_(2)→^(*)N_(2)H)andΔG(^(*)NH_(2)→^(*)NH_(3))was optimized to be closer to the ideal space of eNRR activity after modulating TM@WS_(2)SACs by these two design *** combining the reaction selectivity trend plot,we picked out N-Os@WS_(2),C-Ir@WS_(2),Fe_(2)@WS_(2),and Ru_(2)@WS_(2)as optimal eNRR catalysts with low limiting potential(UL),and N-Os@WS_(2)SAC(UL:-0.28 V)outperforms the best eNRR catalyst among TM@WS_(2)*** constructing explicit solvent models,we conducted a detailed study on the reaction kinetics of proton transfer over these four *** propose that the activity enhancement in TM@WS_(2)SACs for eNRR can be attributed to the ligand effect and geometric effect brought about by CE and DS strategies,improving the donation-backdonation process of electron transfer between N_(2)and the active *** designed catalyst has certain resistance to demetallization and agglomeration under simulated solvent *** work provides a feasible design strategy for the activity enhancement of SACs and brings a new perspective to deeply understanding the volcano plot in heterogeneous catalysis.

关键词： linear scaling relationship volcano plot single-atom catalysts density functional theory(DFT) electrochemical nitrogen reduction

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Sulfur vacancies-induced“Electron Bridge”in Ni_(4)Mo/Sv-Zn_(x)Cd_(1-x)S regulates electron transfer for efficient H_(2)-releasing photocatalysis

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Journal of Energy Chemistry 2023年第4期79卷 64-71页

作者： Xin Zhang Manyi Gao Longyu Qiu Jie Sheng Weiwei Yang Yongsheng Yu State Key Laboratory of Urban Water Resource and Environment School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbin 150001HeilongjiangChina Laboratory for Space Environment and Physical Science Research Center of Basic Space ScienceHarbin Institute of TechnologyHarbin 150001HeilongjiangChina

Despite the existence of plentiful photocatalyst heterojunctions,their separation efficiency and charge flow precision remain low on account of lacking interfacial ***,through a defect-induced heterojunction constructing strategy,Ni4Mo alloys were in-situ grown on the unsaturated coordinated sulfur atoms of sulfur vacancies-rich ZCS(Sv-ZCS)via interfacial Ni-S covalent *** experimental and theoretical results reveal that these unsaturated sulfur atoms induced by sulfur vacancies vastly facilitate to anchor more Ni-Mo nanoparticles and form abundant Ni-S covalent bonds,meanwhile,these sulfur vacancies could form dual internal electric field(IEF)and work with Ni-S covalent bonds as“Electron Bridge”to further accelerate photoelectrons transfer,as well as promote the activation of water molecules and the desorption of hydrogen ***,the optimized Ni_(4)Mo/Sv-ZCS composite achieves an improved photocatalytic hydrogen evolution(PHE)rate of 94.69 mmol h^(-1)g^(-1)without an evident decrease after 6 cycles of photocatalytic tests,which is 21.2 and 1.94 times higher than those of Pt/ZCS and Ni_(4)Mo/ZCS,*** tactic opens a new way for optimizing Zn_(x)Cd_(1-x)S-based heterojunctions by constructing sulfur vacancies and covalent bonds as“Electron Bridge”to enhance the activity of PHE.

关键词： Ni_(4)Mo Sulfur vacancies-rich Zn_(x)Cd_(1-x)S Electron Bridge Photocatalytic hydrogen evolution

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Tunable quantum anomalous Hall effects in ferromagnetic van der Waals heterostructures

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National science Review 2024年第3期11卷 100-107页

作者： Feng Xue Yusheng Hou Zhe Wang Zhiming Xu Ke He Ruqian Wu Yong Xu Wenhui Duan Beijing Academy of Quantum Information Sciences State Key Laboratory of Low Dimensional Quantum Physics Department of Physics Tsinghua University Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices Center for Neutron Science and Technology School of Physics Sun Yat-sen University State Key Laboratory of Surface Physics Key Laboratory of Computational Physical Sciences and Department of PhysicsFudan University Frontier Science Center for Quantum Information Department of Physics and Astronomy University of California-Irvine Tencent Quantum Laboratory Tencent Technology(Shenzhen)Co.Ltd RIKEN Center for Emergent Matter Science(CEMS) Institute for Advanced Study Tsinghua University

The quantum anomalous Hall effect（QAHE） has unique advantages in topotronic applications, but it is still challenging to realize the QAHE with tunable magnetic and topological properties for building functional devices. Through systematic first-principles calculations, we predict that the in-plane magnetization induced QAHE with Chern numbers C = ±1 and the out-of-plane magnetization induced QAHE with high Chern numbers C = ±3 can be realized in a single material candidate, which is composed of van der Waals（vdW）coupled Bi and MnBi2Te4monolayers. The switching between different phases of QAHE can be controlled in multiple ways, such as applying strain or（weak） magnetic field or twisting the vdW materials. The prediction of an experimentally available material system hosting robust, highly tunable QAHE will stimulate great research interest in the field. Our work opens a new avenue for the realization of tunable QAHE and provides a practical material platform for the development of topological electronics.

关键词： quantum anomalous Hall effect topological quantum phase transition van der Waals heterostructures tunable Chern number high Chern number

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