检索结果-内蒙古大学图书馆

Clarifying the viscous relaxation mechanism for twisting carbon nanotube ribbons

International Journal of Mechanical sciences 2025年

作者： Xiaoping Hu Yuxuan Zheng Jie Tian Pengfei Wang School of Computer Science Anqing Normal University Anqing 246011 China Key Laboratory of Impact and Safety Engineering Ministry of Education Ningbo University Ningbo 315211 China Engineering and Materials Science Experiment Center University of Science and Technology of China Hefei 230027 China CAS Key Laboratory of Materials Behavior and Design and Department of Modern Mechanics University of Science and Technology of China Hefei 230027 China

Twisted carbon nanotube (CNT) fibers have emerged as promising candidates for actuators and artificial muscles due to their excellent mechanical properties, offering significant potential in mechanical engineering and intelligent medical applications. Despite this promise, the effects of twisting on the viscous mechanical behavior of CNT fibers and their composites, particularly the evolution of their microstructure and time-dependent relaxation behavior, remain insufficiently understood. This study addresses this gap by conducting single and multiple stress relaxation experiments on untwisted ribbons and twisted CNT fibers. The findings reveal greater stress relaxation in CNT ribbons compared to twisted fibers, attributed to the microstructural constraints introduced by twisting. A viscoelastic model was developed to accurately capture the experimental stress-time curves and provide theoretical derivations of the stress-strain relationships for CNT ribbons and fibers. Additionally, numerical simulations elucidate the underlying viscous mechanisms, demonstrating that the intrinsic viscosity driving stress relaxation governs the time-dependent stress behavior and strain-rate sensitivity of the assembly. The study further highlights the critical role of twisting in shaping relaxation behavior, emphasizing the influence of enhanced interface interactions. Loading-unloading experiments on single and quadruple CNT fibers reveal that interface constraints significantly affect stress relaxation and rate sensitivity, offering new insights into the interplay between microstructural dynamics and mechanical performance. This work advances our understanding of the time-dependent properties of CNT fibers and provides a foundation for designing high-performance CNT-based materials for long-term applications.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Counterintuitive Ballistic and Directional Liquid Transport on a Flexible Droplet Rectifier

引用

Research 2020年第1期2020卷 1009-1019页

作者： Lei Wang Jing Li Bo Zhang Shile Feng Mei Zhang Dong Wu Yang Lu Ji Jung Kai Jing Liu Zuankai Wang Lei Jiang Beijing Key Lab of Cryo-Biomedical Engineering and Key Lab of Cryogenics Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China Department of Mechanical Engineering City University of Hong KongHong Kong 999077China Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education School of ChemistryBeijing Advanced Innovation Center for Biomedical EngineeringBeihang UniversityBeijing 100191China CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Precision Machinery and Precision InstrumentationUniversity of Science and Technology of ChinaHefeiAnhui 230027China

Achieving the directional and long-range droplet transport on solid surfaces is widely preferred for many practical applications but has proven to be ***,directionality and transport distance of droplets on hydrophobic surfaces are mutually ***,we report that drain fly,a ubiquitous insect maintaining nonwetting property even in very high humidity,develops a unique ballistic droplet transport mechanism to meet these demanding *** drain fly serves as a flexible rectifier to allow for a directional and long-range propagation as well as self-removal of a droplet,thus suppressing unwanted liquid *** investigation reveals that this phenomenon is owing to the synergistic conjunction of multiscale roughness,structural periodicity,and flexibility,which rectifies the random and localized droplet nucleation(nanoscale and microscale)into a directed and global migration(millimeter-scale).The mechanism we have identified opens up a new approach toward the design of artificial rectifiers for broad applications.

关键词： directional mechanism roughness

来源：评论

学校读者我要写书评

暂无评论

Light-induced irreversible structural phase transition in trilayer graphene

引用

Light(science & Applications) 2020年第1期9卷 335-345页

作者： Jianyu Zhang Jinsen Han Gang Peng Xi Yang Xiaoming Yuan Yongjun Li Jianing Chen Wei Xu Ken Liu Zhihong Zhu Weiqi Cao Zheng Han Jiayu Dai Mengjian Zhu Shiqiao Qin Kostya S.Novoselov Department of Physics National University of Defense Technology410073 ChangshaChina College of Advanced Interdisciplinary Studies National University of Defense Technology410073 ChangshaChina Hunan Key Laboratory of Super Micro-structure and Ultrafast Process School of Physics and ElectronicsCentral South University410083 ChangshaChina Quantum Design China(Beijing)Co. Ltd100015 BeijingChina Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of Sciences100190 BeijingChina School of Physical Sciences University of Chinese Academy of Sciences100049 BeijingChina Songshan Lake Materials Laboratory Dongguan 523808 GuangdongChina Chongqing 2D Materials Institute Liangjiang New Area400714 ChongqingChina Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of Sciences110016 ShenyangChina School of Material Science and Engineering University of Science and Technology of China230026 AnhuiChina State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Opto-ElectronicsShanxi University030006 TaiyuanChina Department of Materials Science and Engineering National University of SingaporeSingapore 117575Singapore

A crystal structure has a profound influence on the physical properties of the corresponding *** synthesizing crystals with particular symmetries,one can strongly tune their properties,even for the same chemical configuration(compare graphite and diamond,for instance).Even more interesting opportunities arise when the structural phases of crystals can be changed dynamically through external *** abilities,though rare,lead to a number of exciting phenomena,such as phase-change memory *** the case of trilayer graphene,there are two common stacking configurations(ABA and ABC)that have distinct electronic band structures and exhibit very different *** walls exist in the trilayer graphene with both stacking orders,showing fascinating new physics such as the quantum valley Hall *** efforts have been dedicated to the phase engineering of trilayer ***,the manipulation of domain walls to achieve precise control of local structures and properties remains a considerable ***,we experimentally demonstrate that we can switch from one structural phase to another by laser irradiation,creating domains of different shapes in trilayer *** ability to control the position and orientation of the domain walls leads to fine control of the local structural phases and properties of graphene,offering a simple but effective approach to create artificial two-dimensional materials with designed atomic structures and electronic and optical properties.

关键词： structural walls phase

来源：评论

学校读者我要写书评

暂无评论

Tsk Fuzzy System Towards Few Labeled Incomplete Multi-View Data Classification

SSRN

引用

SSRN 2022年

作者： Zhang, Wei Deng, Zhaohong Lou, Qiongdan Zhang, Te Choi, Kup-Sze Wang, Shitong School of Artificial Intelligence and Computer Science Jiangnan University Jiangsu Key Laboratory of Digital Design and Software Technology Wuxi214122 China School of Computer Science University of Nottingham NottinghamNG8 1BB United Kingdom Centre for Smart Health Hong Kong Polytechnic University Hong Kong

In recent years, some multi-view TSK fuzzy systems have been proposed to address the multi-view data. However, most of the existing methods must rely on the labeled and complete multi-view data, which is a demanding condition in real-world applications. Although a few multi-view TSK fuzzy systems have addressed issues about few labeled or incomplete multi-view data, they cannot handle the two challenges simultaneously and still face the following challenges: first, the existing incomplete multi-view fuzzy systems separate the missing view imputation from model construction, which makes two processes lack effective cooperation. Second, the robustness of these methods needs to be enhanced. To address these issues, a novel transductive semi-supervised incomplete multi-view TSK fuzzy system (SSIMV_TSK) is proposed. First, in order to handle challenges brought by the few labeled data and missing views simultaneously, SSIMV_TSK integrates missing view imputation, pseudo label learning, and fuzzy system modeling into one process to yield a model. Then, by exploring information within and between views, two new mechanisms, i.e. the bidirectional structural preservation of instance and label, and the adaptive multiple alignment collaborative learning, are proposed to further improve the robustness of SSIMV_TSK. Experimental results on real-world datasets show that SSIMV_TSK significantly outperforms state-of-the-art methods. © 2022, The Authors. All rights reserved.

关键词： Fuzzy systems

来源：评论

学校读者我要写书评

暂无评论

Accelerating Homomorphic Encryption by Using Representation of Lower Hamming Weight

SSRN

引用

SSRN 2022年

作者： Wu, Junfei Meng, Dan Cao, Guitao Wei, Tongquan Cao, Wenming Shanghai Key Laboratory of Trustworthy Computing East China Normal University Shanghai200062 China MoE Engineering Research Center of SH/HW Co-design Technology and Application East China Normal University Shanghai200062 China OPPO Research Institute Shenzhen China School of Computer Science and Technology China College of Information Engineering Shenzhen University Shenzhen518060 China

How to simultaneously guarantee data processing and data hiding has become a topical issue because of the increasing needs for enhancing privacy protection. Homomorphic encryption is a privacy computing technology that can satisfy the above requirements and strike a balance between security and operability. However, homomorphic encryption suffers from severe computational inefficiency. Although many works attempt to address the problem, few works has noticed that the computational bottleneck of homomorphic encryption is closely related to the Hamming weight of the exponents. In this paper, we investigate the computational efficiency issue of homomorphic encryption and propose a signed binary representation based solution that significantly improves the state of the art Paillier schemes. We first use signed binary representation to reduce the Hamming weight of the exponent, thereby decreasing the number of modular multiplications in homomorphic encryption. We then combine signed binary representation with precomputation techniques to further accelerate homomorphic encryption. Our proposed approach can be integrated into all Paillier schemes and computing platforms without significant modification. The experimental results exhibit that our technique can considerably improve the encryption speed, in particular, it can accelerate the state of the arts by 5.25\times when signed binary representation and precomputation are jointly utilized. © 2022, The Authors. All rights reserved.

关键词： Cryptography

来源：评论

学校读者我要写书评

暂无评论

Pressure tuning of Kitaev spin liquid candidate Na3Co2SbO6

arXiv

引用

arXiv 2025年

作者： Poldi, E.H.T. Tartaglia, R. Fabbris, G. Nguyen, N. Park, H. Liu, Z. van Veenendaal, M. Kumar, R. Jose, G. Samanta, S. Bi, W. Xiao, Y. Popov, D. Wu, Y. Kim, J.-W. Zheng, H. Yan, J. Mitchell, J.F. Hemley, R.J. Haskel, D. Department of Physics University of Illinois at Chicago ChicagoIL60607 United States Advanced Photon Source Argonne National Laboratory ArgonneIL60439 United States Institute of Physics Gleb Wataghin University of Campinas Sao Paulo Campinas13083-859 Brazil Materials Science Division Argonne National Laboratory ArgonneIL60439 United States Department of Physics Northern Illinois University DeKalbIL60115 United States Department of Physics University of Alabama at Birmingham BirminghamAL35294 United States HPCAT Advanced Photon Source Argonne National Laboratory ArgonneIL60439 United States High Flux Isotope Reactor Oak Ridge National Laboratory Oak RidgeTN37831 United States Materials Science and Technology Division Oak Ridge National Laboratory Oak RidgeTN37831 United States Departments of Physics Chemistry and Earth and Environmental Sciences University of Illinois at Chicago ChicagoIL60607 United States

The search for Kitaev’s quantum spin liquid (KQSL) state in real materials has recently expanded with the prediction that honeycomb lattices of divalent, high-spin cobalt ions could host the dominant bond-dependent exchange interactions required to stabilize the elusive entangled quantum state. The layered honeycomb Na3Co2SbO6 has been singled out as a leading candidate provided that the trigonal crystal field acting on Co 3d orbitals, which enhances non-Kitaev exchange interactions between Jeff = 1 /2 spin-orbital pseudospins, is reduced. We find that applied pressure leads to anisotropic compression of the layered structure, significantly reducing the trigonal distortion of CoO6 octahedra. A strong enhancement of ferromagnetic correlations between pseudospins is observed in the spin-polarized (3 Tesla) phase up to about 60 GPa. Higher pressures drive a spin transition into a low-spin state destroying the Jeff = 1 /2 local moments required to map the spin Hamiltonian into Kitaev’s model. The spin transition strongly suppresses the low-temperature magnetic susceptibility and appears to stabilize a paramagnetic phase driven by frustration. Although applied pressure fails to realize a KQSL state, the possible emergence of frustrated magnetism of localized, low-spin S = 1 /2 moments opens the door for exploration of novel magnetic quantum states in compressed honeycomb lattices of divalent cobaltates. Copyright © 2025, The Authors. All rights reserved.

关键词： Nanocrystals

来源：评论

学校读者我要写书评

暂无评论

Top-N recommendation using low-rank matrix completion and spectral clustering

Top-N recommendation using low-rank matrix completion and sp...

引用

作者： Wang, Qian Zhou, Qingmei Zhao, Wei Wu, Xuangou Shao, Xun Network and Information Center AnHui University of Technology Ma'anshan Anhui243032 China School of Computer Science and Technology AnHui University of Technology Ma'anshan Anhui243032 China Anhui Engineering Laboratory for Intelligent Applications and Security of Industrial Internet AnHui University of Technology Ma'anshan Anhui243032 China School of Regional Innovation and Social Design Engineering Kitami Institute of Technology Kitami-shi090-8507 Japan

In the age of big data, recommendation systems provide users with fast access to interesting information, resulting to a significant commercial value. However, the extreme sparseness of user assessment data is one of the key factors that lead to the poor performance of recommendation algorithms. To address this problem, we propose a spectral clustering recommendation scheme with low-rank matrix completion and spectral clustering. Our scheme exploits spectral clustering to achieve the division of a similar user group. Meanwhile, the low-rank matrix completion is used to effectively predict un-rated items in the sub-matrix of the spectral clustering. With the real dataset experiment, the results show that our proposed scheme can effectively improve the prediction accuracy of unrated items. © 2020 The Institute of Electronics, Information and Communication Engineers

关键词： Recommender systems

来源：评论

学校读者我要写书评

暂无评论

Topological charge quadrupole protected by spin-orbit U ( 1 ) quasi-symmetry in antiferromagnet NdBiPt

引用

Newton 2025年第2期1卷

作者： Ao Zhang Xiaobing Chen Jiayu Li Pengfei Liu Yuntian Liu Qihang Liu Department of Physics and Guangdong Basic Research Center of Excellence for Quantum Science Southern University of Science and Technology Shenzhen 518055 China Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area (Guangdong) Shenzhen 518045 China Guangdong Provincial Key Laboratory for Computational Science and Material Design Southern University of Science and Technology Shenzhen 518055 China

The interplay of symmetry and topology in crystal solids has given rise to various elementary excitations as quasiparticles. Among these, those with significant Berry-phase-related transport responses are of particular interest. In this study, we predict a type of quasiparticle called a topological charge quadrupole (TCQ), which is analogous to a charge quadrupole but consists of two closely packed pairs of Weyl points in momentum space, specifically in the half-Heusler antiferromagnet NdBiPt. Interestingly, the TCQ is protected by the spin-orbit U ( 1 ) quasi-symmetry rather than any exact crystallographic symmetries. This quasi-symmetry restricts the energy splitting induced by symmetry-lowering perturbations to a second-order effect. Furthermore, the closely located Berry curvature sources and sinks in the TCQ lead to a large Berry curvature dipole, resulting in a significant nonlinear Hall effect. Our work opens an avenue for designing unconventional quasiparticles utilizing quasi-symmetries and developing materials with enhanced nonlinear responses.

关键词： topological charge quadrupole nonlinear Hall effect quasi-symmetries topological materials antiferromagnetic spintronics

来源：评论

学校读者我要写书评

暂无评论

A thermodynamically consistent model and its conservative numerical approximation for moving contact lines with soluble surfactants

arXiv

引用

arXiv 2021年

作者： Zhao, Quan Ren, Weiqing Zhang, Zhen Department of Mathematics National University of Singapore Singapore119076 Singapore Department of Mathematics Guangdong Provincial Key Laboratory of Computational Science and Material Design Southern University of Science and Technology ShenzhenGuangdong518055 China

We derive a continuum sharp-interface model for moving contact lines with soluble surfactants in a thermodynamically consistent framework. The model consists of the isothermal two-phase incompressible Navier-Stokes equations for the fluid dynamic and the bulk/surface convection-diffusion equations for the surfactant transportation. The interface condition, the slip boundary condition, the dynamic contact angle condition, and the adsorption/desorption condition are derived based on the principle of the total free energy dissipation. In particular, we recover classical adsorption isotherms from different forms of the surface free energy. The model is then numerically solved in two spatial dimensions. We present an Eulerian weak formulation for the Navier-Stokes equations together with an arbitrary Lagrangian-Eulerian weak formulation for the surfactant transport equations. Finite element approximations are proposed to discretize the two weak formulations on the moving mesh. The resulting numerical method is shown to conserve the total mass of the surfactants exactly. By using the proposed model and its numerical method, we investigate the droplet spreading and migration in the presence of surfactants and study their dependencies on various dimensionless adsorption parameters. © 2021, CC BY-NC-ND.

关键词： Finite element method

来源：评论

学校读者我要写书评

暂无评论

Magnetorheological elastomer base isolation in civil engineering: A review

Journal of Infrastructure Intelligence and Resilience

引用

Journal of Infrastructure Intelligence and Resilience 2023年第2期2卷

作者： Jin, Shida Yang, Jian Sun, Shuaishuai Deng, Lei Chen, Zexin Gong, Liping Du, Haiping Li, Weihua School of Mechanical Materials Mechatronic and Biomedical Engineering University of Wollongong WollongongNSW2522 Australia School of Electrical Engineering and Automation Anhui University Hefei China CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Precision Machinery and Precision Instrumentation University of Science and Technology of China Anhui Province Hefei230026 China School of Electrical Computer and Telecommunications Engineering University of Wollongong WollongongNSW2522 Australia

The attention given to magnetorheological elastomers (MREs) has been on the rise over the last few decades. MREs feature a remarkable field-controllable modulus or mechanical characteristics that are influenced by an external magnetic field. Compared to its family member magnetorheological fluids (MRF), MREs offer advantages in terms of overcoming sealing and sedimentation issues. This makes them highly promising for the development of smart base isolation systems of buildings and other infrastructures. This review paper attempts to highlight the impactful progress of MRE base isolation in civil engineering over the past decades. It begins with a brief introduction of MREs including its fundamental principles, operation modes, and fabrication process. Then, the recent investigations of MREs and MRE base isolators are reviewed. Finally, discussions are made on the challenges and potential topics for further investigations. © 2023 The Author(s)

关键词： Magnetorheological fluids

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：