检索结果-内蒙古大学图书馆

Numerical study of dynamic zigzag patterns in migrating epithelial tissue

science China(Physics,Mechanics & Astronomy) 2022年第1期65卷 45-52页

作者： Li-bing Cai Wenjie Ji Jie Luo Qun-li Lei Yu-qiang Ma National Laboratory of Solid State Microstructures and Department of Physics Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China School of Physical Science and Technology Soochow UniversitySuzhou 215006China

Collective cell migration plays a crucial role in embryonic development, metastasis, and wound healing. Nevertheless, to the best of our knowledge, how the coordination between the cell motility and deformations affects the collective motion of epithelial cells is not fully understood. In this work, we propose a modified self-propelled Voronoi model for epithelial cell migration incorporating the coupling between the self-propulsion of cells and the polarization of the cell elongation. At a high coupling strength,we observe the emergence of backward traveling band structures formed by highly aligned cells, which can be regulated by cell elongations or shape anisotropy. Increasing the cell shape anisotropy, we find that large bands split into multiple small microbands. The latter essentially forms a dynamic zigzag pattern, in which the angle between the polarization direction of the bands and the migration direction switches alternatively between π/4 and-π/4 because the cells are forced to move preferentially in the anterior direction. We also analyzed the disclinations in the cell monolayer, force distribution near the domain boundaries and the shape alignment of the epithelial monolayer during the formation of this dynamic pattern. The present findings may further our understanding of stripe pattern formations in living systems and inspire potential designs for cell sorting.

关键词： epithelial tissue collective motion self-propelled Voronoi model zigzag pattern band

来源：评论

学校读者我要写书评

暂无评论

A weak but inert hindered urethane bond for high-performance dynamic polyurethane polymers

引用

Chinese Chemical Letters 2024年第5期35卷 238-243页

作者： Fangzhou Wang Wentong Gao Chenghui Li State Key Laboratory of Coordination Chemistry School of Chemistry and Chemical EngineeringCollaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210023China School of Materials Science and Engineering Nanjing Institute of TechnologyNanjing 211167China

Covalent adaptable networks(CANs),which share the properties of both thermosets and thermoplastics at the same time,are desirable for many *** bulky substituents is a feasible way to design dynamic covalent bonds for constructing CANs,as evidenced by the successful implementation in CANs based on hindered urea bonds(HUBs).However,the dynamicity induced by introducing bulky substituents always come with low bond energy,resulting in low mechanical strength and poor stability of the ***,we designed a novel hindered urethane bond,which is weak in thermodynamic(K_(eq)=1701.23 L/mol at 25℃)and inert in kinetic at low temperature,but stable in thermodynamic(K_(eq)=1.54×10^(4) L/mol at 100℃)and active in kinetic at high temperature(k_(-1)=0.105 h^(-1) at 80℃ and 0.315 h^(-1) at 120℃).As a result,the polyurethane based on it exhibits high mechanical properties(with Youngs’modulus of 1011±29MPa and flexible modulus reached 1833±50MPa)and excellent reversibility(can be reprocessed at 60℃ under 100 kPa in 30 min and completely healed at 40℃ in 10 min).Moreover,unlike to many CANs based on hindered urea bonds,our dynamic polyurethanes are highly stable in humid environment or even water solutions due to the slow hydrolysis *** highperformance dynamic polyurethane polymers are attractive for many applications.

关键词： Covalent adaptable networks Urethane bond Kinetics Thermodynamics

来源：评论

学校读者我要写书评

暂无评论

Dielectric metamaterials with effective self-duality and full-polarization omnidirectional brewster effect

引用

Light(science & Applications) 2024年第11期13卷 2680-2687页

作者： Hao Luo Jie Luo Zhihui Zhang Chao Wu Quan Li Wei Liu Ruwen Peng Mu Wang Hongqiang Li Yun Lai National Laboratory of Solid State Microstructures School of Physicsand Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China School of Physical Science and Technology&Jiangsu key Laboratory of Frontier Material Physics and Devices Soochow UniversitySuzhou 215006China School of Physics Science and Engineering Tongji UniversityShanghai 200092China College of Electronic and Information Engineering Tongji UniversityShanghai 200092China College for Advanced Interdisciplinary Studies National University of Defense TechnologyChangshaHunan 410073China

Conventional dielectric solid materials,both natural and artifcial,lack electromagnetic self-duality and thus require additional coatings to achieve impedance matching with free ***,we present a class of dielectric metamaterials that are effectively self-dual and vacuum-like,thereby exhibiting full-polarization omnidirectional impedance matching as an unusual Brewster effect extended across all incident angles and *** both birefringence and reflection eliminated regardless of wavefront and polarization,such anisotropic metamaterials could establish the electromagnetic equivalence with"stretched free space"in transformation optics,as substantiated through full-wave simulations and microwave *** findings open a practical pathway for realizing unprecedented polarization-independence and omnidirectional impedance-matching characteristics in pure dielectric solids.

关键词： directional duality dielectric

来源：评论

学校读者我要写书评

暂无评论

Spectrum of the Hole Excitation in Spin-Orbit Mott Insulator Na_(2)IrO_(3)

引用

Chinese Physics Letters 2023年第8期40卷 63-67页

作者：王巍董召阳于顺利李建新 School of Science Nanjing University of Posts and TelecommunicationsNanjing 210023China Department of Applied Physics Nanjing University of Science and TechnologyNanjing 210094China National Laboratory of Solid State Microstructures and Department of Physics Nanjing UniversityNanjing 210093China Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjing 210093China

We study the motion of a hole with internal degrees of freedom,introduced to the zigzag magnetic ground state of Na_(2)IrO_(3),by using the self-consistent Born *** find that the low-,intermediate-,and high-energy spectra are primarily attributed to the singlet,triplet,and quintet hole contributions,*** spectral functions exhibit distinct features such as the electron-like dispersion of low-energy states near the L point,the maximum M-point intensity of mid-energy states,and the hole-like dispersion of high-energy *** features are robust and almost insensitive to the exchange model and Hund's coupling,and are in qualitative agreement with the angular-resolved photoemission spectra observed in Na_(2)IrO_(3).Our results reveal that the interference between internal degrees of freedom in different sublattices plays an important role in inducing the complex dispersions.

关键词： dispersion spectra qualitative

来源：评论

学校读者我要写书评

暂无评论

Imaging momentum-space Cooper pair formation and its competition with the charge density wave gap in a kagome superconductor

引用

science China(Physics,Mechanics & Astronomy) 2024年第7期67卷 142-150页

作者： Yiming Sun Yubing Tu Yang Luo Shuikang Yu Hongyu Li Yunmei Zhang Ping Wu Zhuying Wang Fan Zhang Wanru Ma Zuowei Liang Jianjun Ying Tao Wu Ziji Xiang Junfeng He Lei Shan Zhenyu Wang Xianhui Chen Department of Physics CAS Key Laboratory of Strongly Coupled Quantum Matter Physicsand Hefei National LaboratoryUniversity of Science and Technology of ChinaHefei 230026China Information Materials and Intelligent Sensing Laboratory of Anhui Province Institutes of Physical Science and Information TechnologyAnhui UniversityHefei 230601China Collaborative Innovation Center of Advanced Microstructures Nanjing 210093China

The superconducting ground state of kagome metals AV_(3)Sb_(5)(where A stands for K,Rb,or Cs)emerges from an exotic charge density wave(CDW)state that potentially breaks both rotational and time reversal ***,the specifics of the Cooper pairing mechanism,and the nature of the interplay between these two states remain elusive,largely due to the lack of momentum-space(k-space)superconducting energy gap *** implementing Bogoliubov quasiparticle interference(B QPI)imaging,we obtain k-space information on the multiband superconducting gap structureΔ_(SC)^(i)(k)in pristine CsV_(3)Sb_(5).We show that the estimated energy gap on the vanadium d_(xy/x^(2)-y^(2))orbital is anisotropic but nodeless,with a minimal value located near the M ***,a comparison ofΔ_(SC)^(i)(k)with the CDW gapΔ_(CDW)^(i)(k)obtained by angle-re solved photoemission spectro scopy(ARPES)reveals direct k-space competition between the se two order parameters,i.e.,the opening of a large(small)CDW gap at a given momentum corresponds to a small(large)superconducting *** the long-range CDW order is suppressed by replacing vanadium with titanium,we find a nearly isotropic energy gap on both the V and Sb *** information will be critical for identifying the microscopic pairing mechanism and its interplay with intertwined electro nic orders in this kagome superconductor family.

关键词： kagome lattice charge density wave superconducting energy gap scanning tunneling microscopy

来源：评论

学校读者我要写书评

暂无评论

Finite barrier bound state

引用

Light(science & Applications) 2024年第4期13卷 664-671页

作者： Tao Liu Kai Bai Yicheng Zhang Duanduan Wan Yun Lai C.T.Chan Meng Xiao Key Laboratory of Artificial Micro-and Nano-structures of Ministry of Education and School of Physics and Technology Wuhan University430072 WuhanChina. National Laboratory of Solid State Microstructures School of Physicsand Collaborative Innovation Center of Advanced MicrostructuresNanjing University210093 NanjingChina. Department of Physics The Hong Kong University of Science and TechnologyClear Water BayKowloon999077Hong KongChina. Wuhan Institute of Quantum Technology 430206 WuhanChina

A boundary mode localized on one side of a finite-size lattice can tunnel to the opposite side which results in unwanted *** wisdom tells that the tunneling probability decays exponentially with the size of the system which thus requires many lattice sites before eventually becoming negligibly *** we show that the tunneling probability for some boundary modes can apparently vanish at specific ***,similar to bound states in the continuum,a boundary mode can be completely trapped within very few lattice sites where the bulk bandgap is not even *** intriguingly,the number of trapped states equals the number of lattice sites along the normal direction of the *** provide two configurations and validate the existence of this peculiar finite barrier-bound state experimentally in a dielectric photonic crystal at microwave *** work offers extreme flexibility in tuning the coupling between localized states and channels as well as a new mechanism that facilitates unprecedented manipulation of light.

关键词： boundary state eventually

来源：评论

学校读者我要写书评

暂无评论

Neuromorphic Devices, Circuits, and Their Applications in Flexible Electronics

IEEE Journal on Flexible Electronics

引用

IEEE Journal on Flexible Electronics 2024年第1期3卷 42-56页

作者： Wang, Feiyu Zhang, Tongju Dou, Chunmeng Shi, Yi Pan, Lijia Nanjing University Collaborative Innovation Center of Advanced Microstructures School of Electronic Science and Engineering Nanjing210093 China Institute of Microelectronics Chinese Academy of Sciences Key Laboratory of Microelectronics Devices and Integrated Technology Beijing100029 China

Artificial intelligence (AI) has rapidly evolved and sparked a heightened interest in the field of bionic electronics. A key focus in this field is to emulate biological neural networks and create perceptually sensitive and adaptable neuromorphic devices. These devices are essential components for the next-generation flexible wearables, smart textiles, biomedical devices, and soft robots. The remarkable advantage of flexible neuromorphic devices lies in their ability to directly perceive, store, and analyze diverse information from the external environment. A notable feature is the integration of multisensory inputs in flexible neuromorphic devices, which enables enhanced adaptability to complex and dynamic scenarios that may occur in reality. This comprehensive review examines the structure and functionality of biological synapses and the prospective designs of neuromorphic devices that emulate synaptic functions. We review recent advances in neuromorphic devices and flexible electronic circuits, including different types of neuromorphic devices, such as two-terminal memristors and three-terminal synaptic transistors. We also compare their advantages and limitations. Finally, we discuss the challenges and opportunities for the future development of flexible neuromorphic devices. This review reveals the great potential of neuromorphic devices, circuits, and their applications in flexible electronics and provides valuable insights into the current state-of-the-art and prospects of this field. © 2022 IEEE.

关键词： Memristors

来源：评论

学校读者我要写书评

暂无评论

Omnidirectionally impedance-matched phononic crystals for full-parameter transformation acoustics

引用

science China(Physics,Mechanics & Astronomy) 2025年第5期68卷 16-21页

作者： Chenkai Liu Jie Luo Xiaozhou Liu Yun Lai MOE Key Laboratory of Modern Acoustics National Laboratory of Solid State MicrostructuresSchool of Physicsand Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China School of Physical Science and Technology&Jiangsu Key Laboratory of Frontier Material Physics and Devices Soochow UniversitySuzhou 215006China State Key Laboratory of Acoustics Institute of AcousticsChinese Academy of SciencesBeijing 100190China

In this work,we present an approach to realize full-parameter transformation acoustic media utilizing phononic crystals instead of metamaterials,which has the exceptional advantages of omnidirectional impedance matching and configurable dispersion *** employing a sandwich structure,we demonstrate phononic crystals that exhibit tunable shifted elliptical equal frequency contours and nearly omnidirectional impedance matching *** typical acoustic devices,including a beam shifter and an illusionary scatterer of different size,are demonstrated with the phononic crystal *** work provides a practical platform for implementing full-parameter transformation acoustics,opening avenues for versatile applications such as advanced acoustic imaging and stealth technologies.

关键词： phononic crystals transformation acoustics omnidirectional impedance matching configurable dispersion surfaces

来源：评论

学校读者我要写书评

暂无评论

Evaluation on performance of MM/PBSA in nucleic acid-protein systems

引用

Chinese Physics B 2022年第4期31卷 727-732页

作者： Yuan-Qiang Chen Yan-Jing Sheng Hong-Ming Ding Yu-Qiang Ma Center for Soft Condensed Matter Physics and Interdisciplinary Research School of Physical Science and TechnologySoochow UniversitySuzhou 215006China National Laboratory of Solid State Microstructures and Department of Physics Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China

The molecular mechanics/Poisson-Boltzmann surface area(MM/PBSA) method has been widely used in predicting the binding affinity among ligands,proteins,and nucleic ***,the accuracy of the predicted binding energy by the standard MM/PBSA is not always good,especially in highly charged *** this work,we take the protein-nucleic acid complexes as an example,and showed that the use of screening electrostatic energy(instead of Coulomb electrostatic energy) in molecular mechanics can greatly improve the performance of MM/*** particular,the Pearson correlation coefficient of dataset Ⅱ in the modified MM/PBSA(i.e.,screening MM/PBSA) is about 0.52,much better than that(<0.33)in the standard MM/***,we also evaluate the effect of solute dielectric constant and salt concentration on the performance of the screening MM/*** present study highlights the potential power of the screening MM/PBSA for predicting the binding energy in highly charged bio-systems.

关键词： molecular mechanics/Poisson-Boltzmann surface area(MM/PBSA) screening electrostatic interaction protein nucleic acid molecular dynamics simulation

来源：评论

学校读者我要写书评

暂无评论

Molecular Insights into Striking Antibody Evasion of SARS-CoV-2 Omicron Variant

引用

Chinese Physics Letters 2022年第10期39卷 71-78页

作者： Zeng-Shuai Yan Yao Xu Hong-Ming Ding Yu-Qiang Ma National Laboratory of Solid State Microstructures and Department of Physics Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China Center for Soft Condensed Matter Physics and Interdisciplinary Research School of Physical Science and TechnologySoochow UniversitySuzhou 215006China

The SARS-CoV-2 Omicron variant has become the dominant variant in the *** the structural basis of altered immune response and enhanced transmission of Omicron is particularly ***,taking twenty-five antibodies from four groups as examples,we comprehensively reveal the underlying mechanism of how mutations in Omicron induces the weak neutralization by using molecular ***,the binding strength of 68%antibodies is weakened in Omicron,much larger than that in Delta(40%).Specifically,the percentage of the weakened antibodies vary largely in different ***,the mutation-induced repulsion is mainly responsive for the weak neutralization in AB/CD groups but does not take effect in EF ***,we demonstrate that the disappearance of hydrophobic interaction and salt bridges due to residue deletions contributes to the decreased binding energy in NTD *** work provides unprecedented atomistic details for the distinct neutralization of WT/Delta/Omicron,which informs prospective efforts to design antibodies/vaccines against Omicron.

关键词： Antibody details bridges

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：