检索结果-南通市图书馆

Superconducting anisotropy and vortex pinning in CaKFe_(4)As_(4) and KCa_(2)Fe_(4)As4F_(2)

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2021年第2期30卷 131-137页

作者： A B Yu Z Huang C Zhang Y F Wu T Wang T xie C liu H li W Peng H Q luo G Mu H xiao l x you T Hu State Key laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China Beijing Academy of Quantum Information Sciences Beijing 100193China Center for High Pressure Science and Technology Advanced Research Beijing 100094China CAS Center for Excellence in Superconducting Electronics(CENSE) Shanghai 200050China University of Chinese Academy of Sciences Beijing 100049China Beijing National laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Songshan lake Materials laboratory Dongguan 523808China

The vortex pinning determining the current carrying capacity of a superconductor is an important property to the applications of superconducting *** layered superconductors,the vortex pinning can be enhanced by a strong interlayer interaction in accompany with a suppression of superconducting anisotropy,which remains to be investigated in iron based superconductors(FeSCs)with the layered ***,based on the transport and magnetic torque measurements,we experimentally investigate the vortex pinning in two bilayer FeSCs,CaKFe_(4)As_(4)(Fe1144)and KCa_(2)Fe_(4)As4F_(2)(Fe12442),and compare their superconducting anisotropyγ.While the anisotropyγ≈3 for Fe1144 is much smaller thanγ≈15 in Fe12442 around Tc,a higher flux pinning energy as evidenced by a higher critical current density is found in Fe1144,as compared with the case of *** combination with the literature data of Ba_(0.72)K_(0.28)Fe2As_(2) and Nd Fe As_(O0.82)F_(0.18),we reveal an anti-correlation between the pinning energy and the superconducting anisotropy in these Fe *** results thus suggest that the interlayer interaction can not be neglected when considering the vortex pinning in Fe SCs.

关键词： iron based superconductors vortex pinning anisotropy

Three-dimensional line-of-sight-angle-constrained leader-following cooperative interception guidance law with prespecified impact time

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2025年第1期38卷 491-506页

作者： Hao you xinlong CHANG Jiufen ZHAO Rocket Force University of Engineering Xi’an 710025China

To address the problem of multi-missile cooperative interception against maneuvering targets at a prespecified impact time and desired line-of-Sight(lOS)angles in ThreeDimensional(3D)space,this paper proposes a 3D leader-following cooperative interception guidance ***,in the lOS direction of the leader,an impact time-controlled guidance law is derived based on the fixed-time stability theory,which enables the leader to complete the interception task at a prespecified impact ***,in the lOS direction of the followers,by introducing a time consensus tracking error function,a fixed-time consensus tracking guidance law is investigated to guarantee the consensus tracking convergence of the ***,in the direction normal to the lOS,by combining the designed global integral sliding mode surface and the second-order Sliding Mode Control(SMC)theory,an innovative 3D lOS-angle-constrained interception guidance law is developed,which eliminates the reaching phase in the traditional sliding mode guidance laws and effectively saves energy ***,it effectively suppresses the chattering phenomenon while avoiding the singularity issue,and compensates for unknown interference caused by target maneuvering online,making it convenient for practical engineering ***,theoretical proof analysis and multiple sets of numerical simulation results verify the effectiveness,superiority,and robustness of the investigated guidance law.

关键词： Three-dimensional cooperative interception leader-following missiles Prespecified impact time lOS-angle-constrained Fixed-time stability Global integral sliding mode

Recent progress on elemental tellurium and its devices

在线全文

学校读者我要写书评

暂无评论

Journal of Semiconductors 2025年第1期46卷 91-106页

作者： Jiachi liao Zhengxun lai you Meng Johnny C.Ho Department of Materials Science and Engineering City University of Hong KongKowloonHong Kong 999077China Changsha Semiconductor Technology and Application Innovation Research Institute College of Semiconductors(College of IntegratedC ircuits)Hunan UniversityChangsha 410082China Institute for Materials Chemistry and Engineering Kyushu UniversityFukuoka 8168580Japan State Key laboratory of Terahertz and Millimeter Waves City University of Hong KongKowloonHong Kong 999077China

The rapid advancement of information technology has heightened interest in complementary devices and *** p-type semiconductors often lack sufficient electrical performance,thus prompting the search for new materials with high hole mobility and long-term *** tellurium(Te),featuring a one-dimensional chiral atomic structure,has emerged as a promising candidate due to its narrow bandgap,high hole mobility,and versatility in industrial applications,particularly in electronics and renewable *** review highlights recent progress in Te nanostructures and related devices,focusing on synthesis methods,including vapor deposition and hydrothermal synthesis,which produce Te nanowires,nanorods,and other *** applications in photodetectors,gas sensors,and energy harvesting devices are discussed,with a special emphasis on their role within the internet of things(IoT)framework,a rapidly growing field that is reshaping our technological *** prospects and potential applications of Te-based technologies are also highlighted.

关键词： elemental tellurium photodetector field-effect transistor gas sensor energy harvesting device

Sequence-controlled dynamic covalent units enable decoupling of mechanical and self-healing performance of polymers

在线全文

学校读者我要写书评

暂无评论

SCIENCE CHINA-CHEMISTRY 2025年第2期68卷 745-753页

作者： Zhang, luzhi Huang, Hongfei Sun, lijie Ma, xiaopeng Tan, Hui you, Zhengwei Shantou Univ Resp Dept Shenzhen Childrens Hosp Med Coll Shenzhen 518038 Peoples R China Donghua Univ Shanghai Key Lab Lightweight CompositeRes Base Te Coll Mat Sci & EngnChina Text Engn SocInst Funct State Key Lab Modificat Chem Fibers & Polymer Mat Shanghai 201620 Peoples R China Univ Elect Sci & Technol China Yangtze Delta Reg Inst Huzhou Huzhou 313001 Peoples R China

Sequence regulation provides an effective approach to controlling the properties of polymer materials. However, this approach remains an open question in the field of dynamic polymers, which emerge as more and more important new generation materials. Herein, we systematically investigate the effect of sequence control of dynamic covalent units in tuning the properties of materials. Different sequence-controlled poly(oxime-urethanes) are designed. The dynamic oxime-urethane groups are relatively dispersed (SCP-1) or concentrated (SCP-2) distributed in their molecular chains. The sequence control strategy provides an efficient way to decouple the mechanical and self-healing performance of polymers, which is one of the most pressing challenges in the field. The relatively dispersed oxime-urethane groups in SCP-1 not only facilitate the reorganization of the dynamic covalent bonds but also increase the probability of the reformation of hydrogen bonds. The reversible dissociation/reassociation of dynamic bonds is conducive to dissipating energy to enhance mechanical performance and promote self-healing properties. As a result, SCP-1 exhibits much faster self-healing than SCP-2, and its tensile strength is nearly twice that of SCP-2. In addition, energy dissipation capacity and degradation behavior also show significant sequence dependence. Overall, this work reveals a new molecular structure-property relationship and provides a powerful strategy to construct high-performance polymers.

关键词： sequence control dynamic polymer poly(oxime-urethane) strength polyurethane

Surface integrity characterization of thirdgeneration nickel-based single crystal blade tenons after ultrasonic vibration-assisted grinding

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2025年第1期38卷 235-253页

作者： Biao ZHAO Hexu you Qing MIAO Wenfeng DING Ning QIAN Jiuhua xU National Key laboratory of Science and Technology on Helicopter Transmission Nanjing University of Aeronautics and AstronauticsNanjing 210016China College of Mechanical Engineering Suzhou University of Science and TechnologySuzhou 215009China

Machined surface integrity of workpieces in harsh environments has a remarkable influence on their ***,the complexity of the new type of machining hinders a comprehensive understanding of machined surface integrity and its formation mechanism,thereby limiting the study of component *** increasing demands for high-quality machined workpieces in aerospace industry applications,researchers from academia and industry are increasingly focusing on post-machining surface *** profile grinding test was conducted on a novel single-crystal superalloy to simulate the formation of blade tenons,and the obtained tenons were characterized for surface integrity elements under various operating *** revealed that ultrasonic vibration-assisted grinding(UVAG)led to multiple superpositions of abrasive grain trajectories,causing reduced surface roughness(an average reduction of approximately29.6%)compared with conventional *** examining the subsurface layer of UVAG using transmission electron microscopy,the results revealed that the single-crystal tenon grinding subsurface layer exhibited a gradient evolution from the near-surface to the *** evolution was characterized by an equiaxed nanocrystalline layer measuring 0.34μm,followed by a submicrocrystalline grain-forming zone spanning 0.6μm and finally,a constituent phase-twisted dis-torted deformation zone over 0.62μ*** normal grinding conditions,the tenon exhibited low surface hardening(not exceeding 15%),and residual compressive stresses were observed on its *** cases where grinding burns occurred,a white layer appeared on the tenon's surface,which demonstrated varying thicknesses along the teeth from top to root due to thermal-force-structural coupling ***,these burns introduced residual tensile stresses on the tenon's surface,potentially substantially affecting its fatigue *** paper enhances our understanding of UVAG pro

关键词： Single-crystal blade tenon Seeded gel abrasives Ultrasonic vibration-assisted profile grinding Surface integrity

When AI meets sustainable 6G

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2025年第1期68卷 4-22页

作者： xiaohu you Yongming HUANG Cheng ZHANG Jiaheng WANG Hao YIN Hequan WU National Mobile Communications Research laboratory Southeast University Purple Mountain laboratories Chinese Academy of Military Science China Information Communication Technologies Group

Sixth-generation(6G) networks are anticipated to achieve transformative advancements, characterized by extreme connectivity, deep integration with artificial intelligence(AI) and sensing, and airground integration. The evolution of 6G exhibits two major trends: ubiquitous intelligence and sustainability. The former aims to embed state-of-the-art AI technology into the 6G network, from the physical layers to applications, while the latter emphasizes reducing energy consumption while enhancing network performance to address environmental concerns. Despite the amazing progress in recent years, AI advancements come with substantial increases in data and computational overhead, posing critical challenges for integrating AI into sustainable 6G networks. First, high energy consumption from large datasets and heavyweight AI models contradicts6G's green goals. Second, the precise collection of large datasets, message delivery latency, and inference delays in AI models pose challenges for real-time tasks in 6G. Third, the uninterpretability and unpredictability of AI models complicate meeting the stringent requirements for controllable transmission in dynamic wireless environments. Addressing these challenges and achieving sustainable 6G with ubiquitous intelligence calls for a revolutionary design of 6G architecture and AI frameworks. To this end, this paper introduces a novel and practical methodology for green, real-time, and controllable 6G native intelligence,starting with knowledge graph(KG) analysis to extract small but critical datasets, followed by the development of distributed lightweight AI models, and the use of digital twins(DTs) to create precise replicas of physical 6G networks. This leads to a pervasive multi-level(PMl)-AI framework supported by a task-centric, three-layer 6G architecture. The AI framework operates through non-real-time and real-time cycles, leveraging three key technologies: wireless data KGs for efficient data management,lightweight AI mode

关键词： artificial intelligence sustainable 6G green real-time controllable

Mach reflection and pressure/heating loads on V-shaped blunt leading edges with variable cross-sections and crotches

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2025年第1期38卷 271-285页

作者： Tao ZHANG xuhui ZHANG luoyu RAO Chongguang SHI Chengxiang ZHU Yancheng you School of Aerospace Engineering Xiamen UniversityXiamen 361005China China Academy of Aerospace Science and Innovation Beijing 100176China

The primary Mach Reflection(MR)and pressure/heating loads on V-shaped Blunt leading Edges(VBlEs)with variable elliptic cross-sections and conic crotches are theoretically investigated in this *** simplified continuity method is used to forecast the shock *** theoretical predictions and the numerical simulations for the Mach stem and the triple point as well as the curved shock accord *** on the theoretical model,an analysis of the impact of the axial ratio a/b of the cross-sectional shape and the eccentricity e of the crotch sweep path on shock structures is carried *** shock configurations obtained from the theoretical model enable the derivation of the transition boundaries between the primary MR and the same family Regular Reflection(sRR).It is found that the increase of a/b and e can both facilitate the primary MR to sRR *** resulting transition and the corresponding generation of the wall pressure and heat flux are then *** results indicate that higher values of the ratio a/b can significantly reduce the wall pressure and heating loads by inducing the primary MR to sRR ***,the increase in the eccentricity e results in increased loads,despite causing the same transition.

关键词： Aerodynamics Hypersonic flow Shock waves Heat flux V-shaped blunt leading edges

A deeper and hotter Martian core-mantle differentiation inferred from FeO partitioning

在线全文

学校读者我要写书评

暂无评论

Science Bulletin 2025年第3期70卷 429-436页

作者： Yunguo li Chunhui li you Zhou Yun liu Huaiwei Ni State Key laboratory of lithospheric and Environmental Coevolution University of Science and Technology of ChinaHefei 230026China Deep Space Exploration laboratory/School of Earth and Space Sciences University of Science and Technology of ChinaHefei 230026China Research Centre for Planetary Science College of Earth and Planetary SciencesChengdu University of TechnologyChengdu 610059China State Key laboratory of Ore Deposit Geochemistry Chinese Academy of SciencesGuiyang 550081China

The core-mantle differentiation process plays a pivotal role in redistributing material on a massive scale,shaping the long-term evolution of rocky *** this process is crucial for gaining insights into the accretion and evolution of planets like ***,the details of Mars’s core-mantle differentiation remain poorly understood due to limited compositional data for its core and *** this study,we aim to constrain the Martian core-mantle differentiation by examining FeO partitioning between core and mantle materials,incorporating improved Martian compositional data from the InSight *** ab initio thermodynamic techniques,we calculated the FeO partition coefficient between liquid iron and silicate *** results align with previous studies while also clarifying the factors affecting partitioning *** on these findings and estimates of oxygen concentration in the core,we infer that Mars’s core and mantle likely differentiated at temperatures above 2440 K and pressures ranging from 14 to 22 *** these estimates are higher than previously reported,they are consistent with observed abundances of moderately siderophile elements and Mars’s accretion models.

关键词： Mars Core-mantle differentiation Volatile Partitioning

Charged functional groups modified porous spherical hollow carbon material as CDI electrode for salty water desalination

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2025年第3期149卷 254-267页

作者： Yushan Ni Yunlong Pu Jie Zhang Weiyan Cui Mingjun Gao Dongjiang you School of Environmental and Material Engineering Yantai UniversityYantai 264005China

As a new electrochemical technology,capacitive deionization(CDI)has been increasingly applied in environmental water treatment and seawater *** this study,functional groups modified porous hollow carbon(HC)were synthesized as CDI electrode material for removing Na^(+)and Cl^(−)in salty *** showed that the average diameter of HC was approximately 180 nm,and the infrared spectrum showed that its surface was successfully modified with sulfonic and amino groups,*** sulfonic acid functionalized HC(HC-S)showed better electrochemical and desalting performance than the amino-functionalized HC(HC–N),with a maximum Faradic capacity of 287.4 F/g and an adsorptive capacity of 112.97 mg/g for ***,92.63%capacity retention after 100 adsorption/desorption cycles demonstrates the excellent stability of *** main findings prove that HC-S is viable as an electrodematerial for desalination by high-performance CDI applications.

关键词： Hollow carbon Functional groups Desalination Capacitive deionization