期刊文献+
任意字段
题名或关键词
题名
关键词
摘要
作者
第一作者
机构
刊名
分类号
参考文献
作者简介
基金资助
栏目信息
共找到145,489篇文章
< 1 2 … 250 >
每页显示 20 50 100
已选0条
引用分析
参考文献
引证文献
 统计分析
检索结果
已选文献
显示方式：
Additive manufacturing for space applications:A review of materials,methods,and future frontiers 认领 引用 被引量：1
1
作者 Dhanesh G.Mohan Saiyathibrahim A +3 位作者 Gopi S Vijaykumar S.Jatti Kumar S Murali Krishnan R 《China Welding》 CAS 2026年第1期1-16,共16页
Additive manufacturing(AM),globally referred to as 3D printing,is a highly flexible manufacturing method that enables the design and creation of complex geometries with ease.This review article comprehensively examine... Additive manufacturing(AM),globally referred to as 3D printing,is a highly flexible manufacturing method that enables the design and creation of complex geometries with ease.This review article comprehensively examines the materials,methods,and applications of AM specifically for the space sector,while identifying current research gaps and proposing future directions.The primary advantages of AM over conventional subtractive manufacturing for space implementations include economic efficiency,unparalleled design freedom,high customizability,tailor-made production,and the ability to process a wide range of materials including metals,polymers,composites,and ceramics.The article focuses on space-grade materials such as high-performance alloys,polymers,and ceramics used in applications ranging from electronic equipment to propulsion systems.It provides a detailed analysis of prevalent metal AM techniques like powder bed fusion and directed energy deposition,as well as non-metal methods including used deposition modeling and selective laser sintering.Through specific case studies,it demonstrates how AM enables part consolidation,weight reduction,and the production of multifunctional components with integrated capabilities.This review will help readers comprehend current trends in space additive manufacturing and understand its future potential in next-generation space applications,from in-situ manufacturing to the realization of fully additively manufactured spacecraft. 展开更多
关键词 Additive manufacturing Space applications Aerospace components In-situ manufacturing Materials processing Design optimization
暂未订购 下载PDF
THE BOUNDEDNESS OF INHOMOGENEOUS CALDERÓN-ZYGMUND CONVOLUTION OPERATORS ON LOCAL PRODUCT HARDY SPACES 认领 引用
2
作者 Shaoyong HE Jiecheng CHEN 《Acta Mathematica Scientia》 SCIE CSCD 2026年第1期99-111,共13页
It is well known that the inhomogeneous Calderón-Zygmund convolution operators are bounded on the local Hardy spaces.In this paper,we prove that these operators are bounded on the local product Hardy spaces and t... It is well known that the inhomogeneous Calderón-Zygmund convolution operators are bounded on the local Hardy spaces.In this paper,we prove that these operators are bounded on the local product Hardy spaces and the Lipschitz spaces.The key ideas used here are the discrete local Calderón identity and a density argument for the inhomogeneous product Lipschitz spaces in the weak sense. 展开更多
关键词 local Hardy space Lipschitz space inhomogeneous Calderón-Zygmund operator discrete Calderón identity
暂未订购 下载PDF
Transformations of space electromagnetic fields in different non-inertial reference frames and their applications 认领 引用
3
作者 Chao Shen Yong Ji 《Earth and Planetary Physics》 EI CSCD 2026年第2期269-279,共11页
How to transform an electromagnetic field across non-inertial frames of reference is a common challenge encountered in electromagnetic space measurements and analyses.Finding clear and precise ways to evaluate transfo... How to transform an electromagnetic field across non-inertial frames of reference is a common challenge encountered in electromagnetic space measurements and analyses.Finding clear and precise ways to evaluate transformation formulas can be difficult.This study presents results of a thorough theoretical investigation that has yielded universal transformation formulas;these transformations are successfully applied to two specific scenarios.We find that,for space plasmas,if the relative velocities of structures are significantly lower than the speed of light,Galilean transformations are suitable.The transformations presented in this paper are applicable,in low speed situations,to electromagnetic fields,electric potentials and magnetic vector potentials,and to charge density and current density,measured in various non-inertial reference frames.Truncation errors associated with these simplified transformations are calculated and shown to be acceptable.These findings have broad implications for space physics measurements and analyses.We address two key issues related to non-inertial frame transformations:first,how to derive a general formula for the rotational electric potential of planets with intrinsic magnetic fields;second,how to verify rigorously the calculation of charge density from MMS(Magnetospheric Multiscale)electrostatic field measurements.We suggest that,due to the validity of the Coulomb gauge,the Poisson equation can be applied in situations of low-speed motion,allowing MMS measurement data to be used to calculate minimal-error charge density. 展开更多
关键词 transformation of electromagnetic fields space physics charge density in space
暂未订购 下载PDF
Sky's the Limit In Wenchang, commercial aerospace is soaring to new heights, propelled by Hainan FTP's island-wide special customs operations 认领 引用
4
作者 Xia Yuanyuan 《China Report ASEAN》 2026年第3期30-31,共2页
At 11:00 p.m. on January 13, 2026, floodlights illuminated the launch pad at the Hainan Commercial Space Launch Site in Wenchang,south China’s Hainan Province. A Long March-8A (CZ-8A) carrier rocket lifted off with a... At 11:00 p.m. on January 13, 2026, floodlights illuminated the launch pad at the Hainan Commercial Space Launch Site in Wenchang,south China’s Hainan Province. A Long March-8A (CZ-8A) carrier rocket lifted off with a steady roar, its exhaust lighting up the night sky as it delivered a satellite into its designated orbit.The development of China’s first commercial space launch site has been striking. Since its inaugural launch in2024, it has completed 11 missions in less than 14 months—each a success. 展开更多
关键词 Long March space launch site satellite launch special customs operations commercial space launch launch pad Hainan Wenchang commercial aerospace
暂未订购 下载PDF
Collision risk assessment for constellation satellites based on a space debris environment topological network model 认领 引用 被引量：1
5
作者 Yurun YUAN Jingrui ZHANG +2 位作者 Keying YANG Lincheng LI Hao WU 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2026年第2期472-484,共13页
In recent years,the rapid development of mega-constellations has significantly exacerbated the deterioration of the space debris environment,posing substantial and escalating threats to the safety of spacecraft.This s... In recent years,the rapid development of mega-constellations has significantly exacerbated the deterioration of the space debris environment,posing substantial and escalating threats to the safety of spacecraft.This study aims to explore the complex evolution of the space debris environment and assess the collision risks associated with spacecraft.First,a space debris environment topological network model is proposed,which incorporates interdisciplinary methods from topological networks,fluid mechanics,and spacecraft dynamics.This model enables a structured representation of the relationships among space objects and provides rapid predictions of the space debris environment.Then,a collision probability algorithm based on the topological network model is introduced.This algorithm inherits the efficiency advantages of the topological network model and has been validated for reliability through comparison with the classical ESA’s DRAMA software.Finally,based on the above models,the collision risks of constellation satellites in Low Earth Orbit(LEO)are analyzed,including both operational and deorbit processes.The study reveals that constellation satellites face a much higher risk of internal collisions with satellites from the same constellation during operations than that with other space objects.Additionally,during the satellite deorbit process,the collision risk peaks when satellites traverse the operational region of Starlink satellites. 展开更多
关键词 Collision probability Computing resource Constellation Space debris Topological network model
暂未订购 下载PDF
Adaptive-length data-driven predictive control for post-operation of space robot non-cooperative target capture with disturbances 认领 引用 被引量：1
6
作者 Peiji WANG Bicheng CAI +2 位作者 Chengfei YUE Yong ZHAO Weiren WU 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2026年第2期485-498,共14页
This paper solves the problem of model-free dual-arm space robot maneuvering after non-cooperative target capture under high control quality requirements.The explicit system model is unavailable,and the maneuvering mi... This paper solves the problem of model-free dual-arm space robot maneuvering after non-cooperative target capture under high control quality requirements.The explicit system model is unavailable,and the maneuvering mission is disturbed by the measurement noise and the target adversarial behavior.To address these problems,a model-free Combined Adaptive-length Datadriven Predictive Controller(CADPC)is proposed.It consists of a separated subsystem identification method and a combined predictive control strategy.The subsystem identification method is composed of an adaptive data length,thereby reducing sensitivity to undetermined measurement noises and disturbances.Based on the subsystem identification,the combined predictive controller is established,reducing calculating resource.The stability of the CADPC is rigorously proven using the Input-to-State Stable(ISS)theorem and the small-gain theorem.Simulations demonstrate that CADPC effectively handles the model-free space robot post operation in the presence of significant disturbances,state measurement noise,and control input errors.It achieves improved steady-state accuracy,reduced steady-state control consumption,and minimized control input chattering. 展开更多
关键词 Combined control Data-driven predictive control Post operation Predictive control systems Space non-cooperative target capture
暂未订购 下载PDF
Experimental techniques for qualitative and quantitative characterization of shale oil reservoir space,minerals,and fluids 认领 引用 被引量：1
7
作者 Siyu Chen Zhenkai Huang +6 位作者 Guangyou Zhu Xi Li Zhiyong Chen Ruilin Wang Yue Huang Shengnan Liu Bijun Huang 《Energy Geoscience》 EI CAS CSCD 2026年第2期1-16,共16页
Characterizing shale oil reservoirs encompassing pore space,mineralogy,and fluids is fundamental to effective exploration and development.Recent advances in experimental techniques have significantly improved both the... Characterizing shale oil reservoirs encompassing pore space,mineralogy,and fluids is fundamental to effective exploration and development.Recent advances in experimental techniques have significantly improved both the qualitative and quantitative analysis of these components;however,a comprehensive systematic review is lacking.High-resolution imaging technologies,such as Scanning Electron Microscopy(SEM),Field Emission Scanning Electron Microscopy(FE-SEM),and Focused Ion Beam Scanning Electron Microscopy(FIB-SEM),enable detailed visualization of pore structures.Gas adsorption and high-pressure mercury intrusion methods provide accurate pore-scale quantification.Moreover,techniques like X-ray Diffraction(XRD),X-ray Fluorescence Spectroscopy(XRF),and Electron Probe Microanalysis(EPMA)allow precise mineral identification and compositional analysis.Confocal Scanning Laser Microscopy(CSLM),Raman Spectroscopy,Nuclear Magnetic Resonance(NMR),and Rock Pyrolysis provide insights into fluid occurrence and content within shale reservoirs.Based on a comprehensive review of existing research,this study identifies several key future directions:(1)addressing the challenges of nanopore observation in reservoir space characterization while minimizing the impact of sample preparation on pore structure;(2)improving the accuracy of quantitative mineral analysis and developing advanced new technologies for the precise measurement of complex mineral compositions;(3)enhancing the fluid quantitative evaluation of fluids by more effectively restoring subsurface geological conditions.This paper presents a current synthesis and forward-looking perspective on experimental techniques supporting shale oil exploration,aiming to guide future research and technological innovation in this field. 展开更多
关键词 Experimental technique Shale oil Reservoir space Mineral analysis Fluid characterization Qualitative and quantitative analysis
暂未订购 下载PDF
A self-learning refined model and tracking for near space hypersonic vehicle by space-based radar 认领 引用 被引量：1
8
作者 Yue XU Quan PAN +2 位作者 Zengfu WANG Hua LAN Shuling JIN 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2026年第5期504-529,共26页
The Near Space Hypersonic Vehicle(NSHV)features a unique design and propulsion system,achieving exceptional speed,range,and maneuverability,which challenge ground-based radars.Space-Based Radar(SBR)offers a breakthrou... The Near Space Hypersonic Vehicle(NSHV)features a unique design and propulsion system,achieving exceptional speed,range,and maneuverability,which challenge ground-based radars.Space-Based Radar(SBR)offers a breakthrough for tracking NSHV targets,with allweather operation and freedom from Earth's curvature,but faces complex coordinate transformations.Traditional models often overlook the NSHV's dynamic gliding trajectory,especially the impact of hidden control variables on maneuvering,causing mismatches during rapid motion changes.This paper proposes a refined tracking model unified in the ECEF coordinate frame,incorporating model parameters that implicitly encode control laws,and presents an ExpectationMaximization Multi-swarm Cooperative Particle Swarm Optimization(EM-MCPSO)framework for both NSHV tracking and model parameter estimation to address this problem.To minimize conversion errors,a transformation matrix directly represented by the state in the EarthCentered Earth-Fixed(ECEF)coordinate is derived.Then the hybrid aerodynamic acceleration coefficients are introduced to precisely describe the dynamic behaviors,formulating target tracking as a joint estimation problem of state and parameters within EM framework.Finally,a self-learning algorithm based on a master–slave structured PSO is proposed to solve the optimization of the conditional expectations of EM under strong nonlinearity,with a Proportional-Derivative(PD)controller accelerating convergence,and updating the population structure with historical data.Simulations of vertical gliding and horizontal maneuvers validate the algorithm's effectiveness. 展开更多
关键词 Dynamics modeling Expectation Maximization(EM) Maneuvering target tracking Near Space Hypersonic Vehicle(NSHV) Particle Swarm Optimization(PSO)
暂未订购 下载PDF
A rapid solving method for steady configurations of the ultra-large spacecraft considering extreme environmental forces 认领 引用
9
作者 Wenhao Li Lei Wu +2 位作者 Haoran Zou Fei Han Zichen Deng 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2026年第6期165-181,共17页
The determination of the steady configuration of flexible spacecrafts in the challenging space environment holds paramount importance for the prediction of structural mechanical behaviors and the monitoring of failure... The determination of the steady configuration of flexible spacecrafts in the challenging space environment holds paramount importance for the prediction of structural mechanical behaviors and the monitoring of failures during in-service conditions.In this paper,based on the nonlinear Euler-Bernoulli beam model,the differential equations describing the steady configuration of an ultra-large spacecraft are transformed into polynomial equations by introducing the moment integration function and Taylor expansion,facilitating rapid and accurate solutions.Furthermore,accounting for the additional moment effect induced by axial component of the gravity-gradient force,the steady configuration under all loads is iteratively calculated starting from the equilibrium configuration under normal loads,resulting in a novel integral and iterative solving method under the combined action of gravity-gradient force and thermal load.Based on the above method,an empirical formula for the steady configuration involving multiple parameters is developed to solve the problem of rapid and accurate prediction of static configurations of large-scale spacecraft under different assembly states.The numerical results show that the proposed method can obtain highly accurate and stable solutions with only a few iterations.Additionally,it sheds light on the impact of spacecraft configuration asymmetry in the space force-thermal environment.Parameter analysis reveals that increasing the spacecraft’s length significantly amplifies the geometric nonlinearity of the structure,and adjusting the spacecraft’s attitude effectively constrains its deformation in the face of force-thermal conditions. 展开更多
关键词 Ultra-large spacecraft Nonlinear steady configurations Space force-thermal environment Rapid solving algorithm P-δeffect
暂未订购 下载PDF
Vision Mamba attention feature fusion UNet:an innovative state space model for accurate polyp segmentation 认领 引用
10
作者 Bo YANG Biyuan LI +1 位作者 Gaowei SUN Jinying MA 《Optoelectronics Letters》 EI 2026年第3期187-192,共6页
Colorectal cancer(CRC)is a prevalent disease,with polyps serving as its precursors.Accurate polyp segmentation is crucial for early CRC prevention.However,due to different sizes of the polyps,the boundaries are not cl... Colorectal cancer(CRC)is a prevalent disease,with polyps serving as its precursors.Accurate polyp segmentation is crucial for early CRC prevention.However,due to different sizes of the polyps,the boundaries are not clear.Therefore,accurate segmentation of polyps is a challenging task.This paper proposes vision Mamba attention feature fusion UNet(VMA-UNet),a U-shaped asymmetric codec structure model grounded in the state space model(SSM).The VMA-UNet incorporates attention feature fusion(AFF)in order to enhance the feature representation of small polyps.A new IUD loss function,namely combining intersection over union(IoU)loss function and Dice loss function,is proposed to address both large polyps and small polyps,and to mitigate the issue of data imbalance.When applied to multiple datasets,VMA-UNet demonstrates robust performance,particularly in small polyp segmentation,showcasing its practical value.The network proposed in this paper overcomes the inherent shortcomings of convolutional neural network(CNN)and transformers,not only performing well in remote interaction modeling,but also maintaining linear computational complexity.Our study introduces a new method for polyp segmentation based on SSM and advances the field. 展开更多
关键词 unet state space model vision mamba polyp segmentation vision mamba attention feature fusion state space model ssm colorectal cancer crc attention feature fusion
暂未订购 下载PDF
Calculation Method and Simulation for Workspace of Arm-Rail Coordinated Spray Painting Robot 认领 引用
11
作者 Kai Li Guolei Wang +2 位作者 Dunmin Lu Yanbin Yao Zhiyong Li 《Computers, Materials & Continua》 SCIE EI 2026年第6期1596-1612,共17页
To address the need for improving the efficiency of spray painting large and complex curved surfaces,this study investigates the arm-rail coordinated spray painting operation method and proposes a robot workspace calc... To address the need for improving the efficiency of spray painting large and complex curved surfaces,this study investigates the arm-rail coordinated spray painting operation method and proposes a robot workspace calculation method for efficient spray area partitioning.The steps for calculating the workspace under the constraints of the principal normal vector and the conical pose domain are introduced,along with an analysis of the robot’s forward and inverse kinematics.Simulation validation was conducted using a wind turbine blade as the target object.The results show that the workspace based on conical pose domain constraints outperforms both the reachable workspace and the full-orientation workspace in terms of validity and coverage,significantly enhancing spray painting efficiency.Compared to traditional fixed-station spray painting systems,the arm-rail coordinated robot can expand the workspace,reduce the number of stations and spray overlap areas,thereby improving efficiency while ensuring coating uniformity. 展开更多
关键词 Arm-rail coordinated spray painting robot workspace spraying region partitioning seed space conical pose domain
暂未订购 下载PDF
Estimates for p-adic fractional integral operator with rough kernels on grand p-adic Herz-type spaces 认领 引用
12
作者 XIA Xiaoxi ZHOU Jiang 《中山大学学报（自然科学版）（中英文）》 CAS CSCD 北大核心 2026年第2期153-159,共7页
The goal of this paper is to establish the boundedness of the p-adic fractional integral operator with rough kernel Iβ,Ω′pand its commutators generated by b∈Λγ(Qpn)(0<γ<1)and the I_(β,Ω′... The goal of this paper is to establish the boundedness of the p-adic fractional integral operator with rough kernel Iβ,Ω′pand its commutators generated by b∈Λγ(Qpn)(0<γ<1)and the Iβ,Ω′p on grand p-adic Herz spaces. 展开更多
关键词 Lipschitz spaces grand p-adic Herz spaces p-adic fractional integral operator commutators
暂未订购 下载PDF
Ocular health in outer space and beyond gravity:A minireview 认领 引用
13
作者 Srishti Khullar Arvind Kumar Morya +3 位作者 Sarita Aggarwal Twinkle Gupta Priyanka Priyanka Rannusha Morya 《World Journal of Clinical Cases》 2026年第3期1-8,共8页
Prolonged exposure to microgravity profoundly influences ocular physiology,giving rise to spaceflight-associated neuro-ocular syndrome(SANS),a significant concern for astronauts on long-duration missions.This review c... Prolonged exposure to microgravity profoundly influences ocular physiology,giving rise to spaceflight-associated neuro-ocular syndrome(SANS),a significant concern for astronauts on long-duration missions.This review consolidates current evidence on ocular adaptations to spaceflight,encompassing pathophysiological mechanisms,diagnostic advances,related ocular conditions,and emerging countermeasures.Literature published between 2000 and 2025 was systematically examined across PubMed,Scopus,and Web of Science,integrating both peer-reviewed studies and technical reports from the National Aeronautics and Space Administration and the European Space Agency.Findings indicate that ocular changes consistent with SANS affect approximately one-third of astronauts,with higher prevalence during missions exceeding six months.Hallmark features include optic disc edema,posterior globe flattening,and mild hyperopic shifts,attributed to cephalad fluid shifts,altered cerebrospinal fluid dynamics,venous congestion,and impaired glymphatic flow.Besides SANS,microgravity predisposes astronauts to dry eye disease,immune-related infections,and radiation-induced cataracts.Recent advances in in-flight optical coherence tomography,optical coherence tomo-graphy angiography,and ultrasound have enhanced early detection,while countermeasures such as lower body negative pressure,artificial gravity,and artificial intelligence-driven ocular monitoring show promise.Understanding ocular adaptations to space not only mitigates mission risks but also enriches terrestrial knowledge of intracranial pressure regulation and neuroophthalmic health. 展开更多
关键词 Spaceflight-associated neuro-ocular syndrome Microgravity Intracranial pressure Ocular health Astronaut physiology Space medicine
暂未订购 下载PDF
Generalized Euler-Riesz difference sequence space with a paranormed fractional ordered µ 认领 引用
14
作者 Munevver Tuz Cigdem Asma Bektas 《Applied Mathematics(A Journal of Chinese Universities)》 SCIE CSCD 2026年第1期214-224,共11页
In this study,we introduce the sequence space lμ(p,Δm) with a fractional order μ.Furthermore,we give some topological properties of this space.Also we introduce α-,β-,andγ-duals of lμ(p,Δm) and its... In this study,we introduce the sequence space lμ(p,Δm) with a fractional order μ.Furthermore,we give some topological properties of this space.Also we introduce α-,β-,andγ-duals of lμ(p,Δm) and its some matrix mappings. 展开更多
关键词 Euler-Riesz sequence space difference sequence space paranorm α-β-andγ-duals matrix transformations
暂未订购 下载PDF
Association of long-term exposure to green space with cardiovascular health and the mediating role of triglyceride-glucose index in middle-aged and older Chinese adults:a nationwide cohort study 认领 引用
15
作者 Jia-Lin YU Jing HE +1 位作者 Qing YANG Xin-Yu GAO 《Journal of Geriatric Cardiology》 SCIE CAS CSCD 2026年第6期344-354,共11页
BACKGROUND Few studies have investigated the associations between green space,the triglyceride-glucose(TyG)index,and cardiovascular health outcomes.This study aims to examine the relationships between green space and ... BACKGROUND Few studies have investigated the associations between green space,the triglyceride-glucose(TyG)index,and cardiovascular health outcomes.This study aims to examine the relationships between green space and chronic cardiovascular diseases among middle-aged and older Chinese adults,while also evaluating the potential mediating effect of the TyG index.METHODS Baseline and follow-up data were collected from the 2011 and 2015 waves,respectively,of the China Health and Retirement Longitudinal Study(CHARLS).Inverse probability of treatment weighting was used to address selection bias.City-level cluster-robust logistic regression analysis was used to assess associations between green space(2011-2014)and hypertension,heart disease,and dyslipidemia.Counterfactual exploratory mediation analysis examined the mediating role of the TyG index.Restricted cubic splines were used to explore the dose-response relationships between green space and the outcomes.RESULTS Among 11,925 participants,each 1 standard deviation(0.0922)increment in the Normalized Difference Vegetation Index(NDVI)was associated with a 13%lower risk of hypertension(OR=0.87,95%CI:0.83-0.92,P<0.001),with a linear dose-response relationship.No significant independent associations were observed for heart disease(OR=0.92,95%CI:0.82-1.03,P=0.142)or dyslipidemia(OR=0.96,95%CI:0.86-1.06,P=0.406).Mediation analysis showed that the TyG index partially mediated the NDVI-hypertension association(indirect effect P<0.05),the proportion mediated was 2.9%(95%CI:1.9%-4.1%).CONCLUSIONS Long-term residential green space exposure is significantly associated with a lower risk of hypertension in middle-aged and older Chinese adults,with the TyG index playing a modest partial mediating role.No significant independent associations were observed for heart disease or dyslipidemia.Enhancing urban greening may be an effective environmental strategy for the primary prevention of hypertension. 展开更多
关键词 green spacethe cardiovascular health green space chronic cardiovascular diseases middle aged older adults long term exposure triglyceride glucose index nationwide cohort study
暂未订购 下载PDF
Hilbert Subspace Imprint:a New Mechanism for Non-Thermalization 认领 引用
16
作者 Hui Yu Jiangping Hu Shi-Xin Zhang 《Chinese Physics Letters》 SCIE EI CAS CSCD 2026年第7期69-73,I0041-I0049,共5页
The search for non-ergodic mechanisms in quantum many-body systems has become a frontier area of research in non-equilibrium physics.In this work,we introduce Hilbert subspace imprint(HSI)-a new mechanism that enables... The search for non-ergodic mechanisms in quantum many-body systems has become a frontier area of research in non-equilibrium physics.In this work,we introduce Hilbert subspace imprint(HSI)-a new mechanism that enables evasion of thermalization,standing as an independent non-ergodic mechanism alongside quantum many-body scars(QMBS)and Hilbert space fragmentation(HSF).HSI manifests when initial states overlap exclusively with a polynomial scaling(with system size)set of eigenstates.We demonstrate this phenomenon through two distinct approaches:weak symmetry breaking and initial state engineering.In the former case,we observe that ferromagnetic states including those with a single spin-flip display non-thermal behavior under weak U(1)breaking,while antiferromag-netic states thermalize.In contrast,the Z2-symmetric model shows thermalization for both ferromagnetic and antiferromagnetic states.In the latter case,we engineer the initial state prepared by shallow quantum circuits that enhance the overlap with the small target subspace. 展开更多
关键词 hilbert space fragmentation hsf hsi initial states overlap non ergodic mechanisms quantum many body scars evasion thermalizationstanding hilbert subspace imprint hsi quantum many body systems non thermalization
暂未订购 下载PDF
Density of Anisotropic Infinite Dimensional Banach Space-Valued Musielak-Orlicz Spaces 认领 引用
17
作者 Yali HE Jingshi XU 《Journal of Mathematical Research with Applications》 CSCD 2026年第2期273-284,共12页
In this paper,we first obtain the density of compactly supported bounded functions in anisotropic infinite dimensional Banach space-valued Musielak-Orlicz spaces.Then,we present the sufficient condition for the space ... In this paper,we first obtain the density of compactly supported bounded functions in anisotropic infinite dimensional Banach space-valued Musielak-Orlicz spaces.Then,we present the sufficient condition for the space of compactly supported smooth functions to be dense in anisotropic infinite dimensional Banach space-valued Musielak-Orlicz spaces.Moreover,the modular density is also given. 展开更多
关键词 anisotropic Banach space-valued density Musielak-Orlicz space
暂未订购 下载PDF
基于Space P和K-means的货运航司航线网络特征分析研究 认领 引用
18
作者 罗凤娥 卫昌波 +1 位作者 韩晓彤 郭玲玉 《现代电子技术》 北大核心 2026年第1期102-107,共6页
针对航空货运行业的迅速扩张,航空货运网络结构变得更加复杂,文中通过Space P建模方法构建了货运航空公司航线网络模型,并运用K-means聚类算法对网络进行了深入分析。选取度、平均路径长度、聚类系数和中间度等关键网络特性指标对航线... 针对航空货运行业的迅速扩张,航空货运网络结构变得更加复杂,文中通过Space P建模方法构建了货运航空公司航线网络模型,并运用K-means聚类算法对网络进行了深入分析。选取度、平均路径长度、聚类系数和中间度等关键网络特性指标对航线网络进行层次化分类,揭示了网络的复杂特征和层次结构。通过仿真实验评估了网络的小世界特性,并利用轮廓系数得到不同K值下的聚类结果,进而确定最优聚类结果。同时,模拟了航线网络在遭受攻击时的鲁棒性,实验结果表明:在航线网络较为脆弱的情况下,该方法为货运航司航线网络的优化和抗风险能力的提升提供了重要参考。 展开更多
关键词 航空货运 Space P 航线网络 复杂网络 聚类算法 网络特征
暂未订购 下载PDF
Enhanced corrosion of aluminum alloys induced by Aspergillus brasiliensis in space 认领 引用
19
作者 Nana CHEN Tong TONG +7 位作者 Ran WANG Xiaowen SONG Zuowei FAN Zhao YIN Lin LU Ziwei HE Junxia YUAN Kui XIAO 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2026年第6期709-722,共14页
With the increasing duration of space missions,the impact of fungi on aerospace materials requires systematic investigation.We evaluate the adaptability of Aspergillus brasiliensis and its corrosion effects on aluminu... With the increasing duration of space missions,the impact of fungi on aerospace materials requires systematic investigation.We evaluate the adaptability of Aspergillus brasiliensis and its corrosion effects on aluminum alloy under space conditions through a 90-day experiment.Fungal growth characteristics,ultrastructural changes,metabolic activity,and interactions with the material surface are analyzed.The results show that Aspergillus brasiliensis maintains high adaptability to microgravity,exhibiting thickened cell walls,enhanced spore formation,and increased metabolic activity.Corrosion analysis reveals that fungal attachment accelerates localized material degradation through organic acid secretion and oxygen concentration differentials.The microgravity environment further amplifies these effects by influencing fungal metabolism and altering corrosion dynamics.Compared to ground-based conditions,space-exposed samples show significantly higher organic acid concentrations and metal ion dissolution,indicating intensified corrosion.These findings enhance the understanding of microbial corrosion mechanisms in space and provide a foundation for antifungal strategies to improve the reliability of aerospace materials during long-term missions. 展开更多
关键词 Aluminum alloys Aspergillus Microbial corrosion Microgravity Space experiment
暂未订购 下载PDF
Dual-Functional Photonic Metacoating Integrating Fluorescence Thermometry and High-Performance Space Radiative Cooling 认领 引用
20
作者 Hao Gong Zhongyang Wang +7 位作者 Yan Zheng Liping Tong Hongchao Li Zhiyuan Zhao Junjia Liu Gang Liu Xiao Zhou Tongxiang Fan 《Nano-Micro Letters》 SCIE EI CAS CSCD 2026年第10期441-458,共18页
Fluorescence thermometry offers a non-contact strategy for early detection of thermal instabilities on complex spacecraft surfaces,enabling reliable in-orbit temperature mapping.However,simultaneously achieving high-s... Fluorescence thermometry offers a non-contact strategy for early detection of thermal instabilities on complex spacecraft surfaces,enabling reliable in-orbit temperature mapping.However,simultaneously achieving high-sensitivity fluorescence thermometry and efficient space radiative cooling remains challenging,as enhanced visible absorption improves thermometric response but increases solar heating.Here,we address this trade-off through a material-structure co-design strategy by developing an Eu-doped ZrO2submicrosphere metacoating that integrates space radiative cooling with fluorescence-based temperature sensing.Guided by photonic-structure optimization using a constrained-gradient optimizer combined with grid-search mapping,the optimized metacoating,featuring a submicrosphere diameter of 0.756μm and a volume fraction of 35%,achieves an ultralow solar absorptance(αs=0.076)and a high thermal emittance(ε=0.931).In parallel,bandgap-driven compositional optimization identifies an optimal Eu content of 8.48%,enabling outstanding thermometric performance.The metacoating delivers a net cooling power of 323.69 W m−2and a 77℃temperature reduction relative to an Al sheet,outperforming representative oxide-based inorganic coatings.It allows temperature sensing over 173-433 K with a maximum relative sensitivity of 0.797%K−1,surpassing fluorescent oxides with comparable absorption edges.Moreover,the metacoating maintains the lowestαsand reliable irradiation resistance under proton,electron,atomic oxygen and ultraviolet exposures,outperforming reported counterparts.Together with its scalable fabrication,this work establishes a dual-functional metacoating platform for intelligent spacecraft thermal management that combines efficient radiative cooling with high-sensitivity fluorescence thermometry. 展开更多
关键词 Photonic metacoating Eu-doped ZrO2submicrosphere Space radiative cooling Fluorescence thermometry
暂未订购 下载PDF
已选0条
引用分析
参考文献
引证文献
 统计分析
检索结果
已选文献
上一页 1 2 … 250 下一页 到第 页
在线咨询 使用帮助 返回顶部 意见反馈