检索结果-内蒙古大学图书馆

Acta Mechanica Sinica 2023年第7期39卷 28-34页

作者：王珂陈毅 Muamer Kadic 王长国 Martin Wegener National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin150001China Institute of Applied Physics Karlsruhe Institute of Technology(KIT)Karlsruhe76128Germany Institute of Nanotechnology Karlsruhe Institute of Technology(KIT)Karlsruhe76128Germany Institut FEMTO-ST UMR 6174CNRSUniversitéde Franche-ComtéBesançon25030France

我们之前的工作表明,声学超材料中的非局部相互作用会导致极不寻常的类roton色散关系,即色散曲线存在局部极小值,与超流体液氦-4类似.然而,这种行为仅限于一个或两个声传播方向.在这里,我们设计了一种三维立方对称声学超材料,沿三个正... 详细信息

我们之前的工作表明,声学超材料中的非局部相互作用会导致极不寻常的类roton色散关系,即色散曲线存在局部极小值,与超流体液氦-4类似.然而,这种行为仅限于一个或两个声传播方向.在这里,我们设计了一种三维立方对称声学超材料,沿三个正交方向具有非局部相互作用.有限元计算表明超材料在三个正交方向具有类roton行为,但其行为远非各向同性.有限元结果与半解析模型结果吻合良好.相应的实验正在探索中,由于需要密集而复杂的三维声学管道,实验要求较高.

关键词：色散关系色散曲线超材料半解析模型非各向同性超流体传播方向正交方向

来源：评论

学校读者我要写书评

暂无评论

Quasisymmetry protected Ising spin-orbit coupling

引用

Physical Review B 2023年第15期107卷 155412-155412页

作者： L. L. Tao Qin Zhang Huinan Li Xianjie Wang Yi Wang Yu Sui Bo Song M. Ye. Zhuravlev School of Physics Harbin Institute of Technology Harbin 150001 China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin 150001 China St. Petersburg State University St. Petersburg 190000 Russia

Quasisymmetry is an approximated symmetry in the sense that it is not the crystalline symmetry but commutes with the Hamiltonian at a lower order. Unlike exact symmetry, quasisymmetry emerges in the context of low-energy effective theory. One of the most desirable properties added by quasisymmetry is the large Berry curvatures due to the perturbatively small band gaps, which are robust against chemical and physical perturbations. Ising spin-orbit coupling (SOC) is a special type of SOC with electron spins polarizing to out-of-plane direction and can protect the spin coherence against the relaxation. For Ising-type superconductors, Ising SOC significantly affects the superconducting properties such as Pauli limit. It is commonly believed that the out-of-plane mirror symmetry Mz is necessary for Ising SOC, which puts a constraint on the allowed materials. Here we demonstrate that the strong Ising SOC exists beyond the system with Mz symmetry and is protected by the quasisymmetry. Based on the group-theoretical analysis and density-functional theory calculations, we show that the lower-order SOC Hamiltonian for certain representation is Ising type, which is protected by the quasisymmetry. Several promising systems with strong Ising SOC of several hundreds of meV near the Fermi energy are identified. In addition, we propose the general design principles to search for the realistic materials. Our results advance the fundamental understanding of Ising spin-orbit physics and greatly broaden the range of the materials hosting the Ising SOC.

关键词： Crystal symmetry Spin polarization Spin-orbit coupling Spintronics Interfaces Density functional theory k dot p method

来源：评论

学校读者我要写书评

暂无评论

Hydrogel-elastomer-based stretchable strain sensor fabricated by a simple projection lithography method

引用

International Journal of Smart and Nano Materials 2021年第3期12卷 256-268页

作者： Zhenqing Li Xiangnan He Jianxiang Cheng Honggeng Li Yuan-Fang Zhang Xiaojuan Shi Kai Yu Hui Ying Yang Qi Ge Shenzhen Key Laboratory of Biomimetic Robotics and Intelligent Systems Department of Mechanical and Energy EngineeringSouthern University of Science and TechnologyShenzhenChina Guangdong Provincial Key Laboratory of Human-Augmentation and Rehabilitation Robotics in Universities Southern University of Science and TechnologyShenzhenChina Digital Manufacturing and Design Centre Singapore University of Technology and DesignSingapore Department of Mechanical Engineering University of Colorado DenverDenverCOUSA National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbinP.R.China

Stretchable strain sensor detects a wide range of strain variation and is therefore a key component in various *** traditional ones made of elastomers doped with conductive components or fabricated with liquid conductors,ionically conductive hydrogel-based strain sensors remain conductive under large deformations and are ***,dehydration is a challenging issue for the *** have developed hydrogel-elastomer-based strain sensors where an elastomer matrix encapsulates a hydrogel circuit to prevent its ***,the reported multistep approaches are generally *** group recently reported a multimaterial 3D printing approach that enables fast fabrication of such sensors,yet requires a self-built digital-light-processing-based multimaterial 3D ***,we report a simple projection lithography method to fabricate hydrogel-elastomer-based stretchable strain sensors within 5 *** method only requires a UV projector/lamp with photomasks;the chemicals are commercially available;the protocols for preparing the polymer precursors are friendly to users without chemistry ***,the manufacturing flexibility allows users to readily pattern the sensor circuit and attach the sensor to a 3D printed soft pneumatic actuator to enable strain sensing on the *** proposed approach paves a simple and versatile way to fabricate hydrogel-elastomer-based stretchable strain sensors and flexible electronic devices.

关键词： Ionically conductive hydrogel stretchable strain sensor projection lithography

来源：评论

学校读者我要写书评

暂无评论

Preface:Mechanics of soft materials and lexible structures

引用

Acta Mechanica Sinica 2021年第5期37卷 746-747页

作者： Haibao Lu Shaoxing Qu Xiqiao Feng State Key Laboratory of Science and Technology On Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150080P.R.China Key Laboratory of Soft Machines and Smart Devices of Zhejiang Province Department of Engineering MechanicsZhejiang UniversityHangzhou 310027China Institute of Biomechanics and Medical Engineering AMLDepartment of Engineering MechanicsTsinghua UniversityBeijing 100084China

Soft materials and lexible structures have become essential and hot topic,which is expected to signiicantly promote the research and development of current mechanics,physics,chemistry and life ***,the soft materials and lexible structures have attracted enthusiastic attentions due to their great potential and practical applications in deployable structures,morphing structures,sensors,actuators,health-monitoring etc.

关键词： Mechanics structures Preface

来源：评论

学校读者我要写书评

暂无评论

Stable perovskite solar cells with 23.12% efficiency and area over 1 cm^(2) by an all-in-one strategy

引用

science China Chemistry 2022年第7期65卷 1321-1329页

作者： Hongzhen Su Xuesong Lin Yanbo Wang Xiao Liu Zhenzhen Qin Qiwei Shi Qifeng Han Yiqiang Zhang Liyuan Han State Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong UniversityShanghai 200240China Special Division of Environmental and Energy Science Komaba Organization for Educational Excellence(KOMEX)College of Arts and SciencesUniversity of TokyoTokyo 153-8902Japan School of Materials Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China SJTU-Paris Elite Institute of Technology Shanghai Jiao Tong UniversityShanghai 200240China School of Materials Science and Engineering Henan Institute of Advanced TechnologyZhengzhou UniversityZhengzhou 450001China

To realize the commercialization of perovskite solar cells(PSCs), it is required to overcome the remaining challenges in device enlargement and operational stability. Here, we report an all-in-one strategy by integrating the oxidation of hole-transport material(HTM) with the formation of the passivation layer, which simultaneously solved the stability issues caused by HTM oxidation and realized the uniform defects in passivation over a large area. The resulting devices achieved a certified PCE of23.12% on average with an aperture area of 1.04 cm^(2) and are reproducible with high operational stability because of the exclusion of air exposure, hygroscopic Li-TFSI, and the lithium-based wastes, maintaining ca. 90% of their initial PCEs after operation at the maximum power point under continuous 1 sun illumination for 1,600 h. Our strategy simplifies the fabrication process of PSCs, which is compatible with commercial-scale methods, offering facile access to efficient and stable large-area PSCs.

关键词： perovskite solar cells oxidation of hole-transport materials uniform defects passivation

来源：评论

学校读者我要写书评

暂无评论

Reshapeable,rehealable and recyclable sensor fabricated by direct ink writing of conductive composites based on covalent adaptable network polymers

引用

International Journal of Extreme Manufacturing 2022年第1期4卷 94-107页

作者： Xu He Yuchen Lin Yuchen Ding Arif M Abdullah Zepeng Lei Yubo Han Xiaojuan Shi Wei Zhang Kai Yu Department of Mechanical Engineering University of Colorado DenverDenverCO 80217United States of America Department of Chemistry University of Colorado BoulderBoulderCO 80309United States of America School of Electronic and Information Engineering Beijing Jiaotong UniversityBeijing 100044People’s Republic of China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150080People’s Republic of China

Covalent adaptable network(CAN)polymers doped with conductive nanoparticles are an ideal candidate to create reshapeable,rehealable,and fully recyclable *** the other hand,3D printing as a deterministic manufacturing method has a significant potential to fabricate electronics with low cost and high design *** this paper,we incorporate a conductive composite consisting of polyimine CAN and multi-wall carbon nanotubes into direct-ink-writing 3D printing to create polymeric sensors with outstanding reshaping,repairing,and recycling *** developed printable ink exhibits good printability,conductivity,and *** conductivity of printed polyimine composites is investigated at different temperatures and deformation strain *** shape-reforming and Joule heating-induced interfacial welding effects are demonstrated and ***,a temperature sensor is 3D printed with defined patterns of conductive pathways,which can be easily mounted onto 3D surfaces,repaired after damage,and recycled using *** sensing capability of printed sensors is maintained after the repairing and ***,the 3D printed reshapeable,rehealable,and recyclable sensors possess complex geometry and extend service life,which assist in the development of polymer-based electronics toward broad and sustainable applications.

关键词： bond exchange reactions polyimine covalent adaptable networks direct ink writing rehealable electronics recyclability

来源：评论

学校读者我要写书评

暂无评论

Enhanced Ablative Performance of Zrb2 Bioinspired Fiber-Aggregated Ceramics with a Design of Dual-Interface Structure

SSRN

引用

SSRN 2023年

作者： Duan, Xianghan Wei, Chuncheng Li, Shuang Meng, Fantao Chen, Dehui Zhang, Xinghong Han, Qingyun School of Material Science and Engineering Shandong University of Technology Zibo255049 China National Key Laboratory of Science and Technology for National Defence on Advanced Composites in Special Environments Harbin Institute of Technology Harbin150080 China

ZrB2-SiC/BN/ZrB2-SiC dual-interface fiber-aggregated ceramic (DFC) was fabricated by wet-extruding and hot-pressing, then the ablation resistance of the ceramics was investigated by plasma flame with heat flux of 8.2 MW/m2 for 120 s. After ablation, the DFC remained an intact structure, and had the mass and linear ablation rates of -0.263 mg·s-1 and -0.171 μm·s-1, respectively. Compared with the catastrophic failure in mono-interface fiber-aggregated ceramics, DFC presented a typical non-ablative behavior during ablation. The enhanced ablation resistance of DFC was attributed to the fast heat transfer channel and continuous dense barrier of SiO2-ZrO2 with low oxygen permeability brought by the dual-interface. © 2023, The Authors. All rights reserved.

关键词： Thermal conductivity

来源：评论

学校读者我要写书评

暂无评论

4D printing of personalized shape memory polymer vascular stents with negative Poisson’s ratio structure:A preliminary study

引用

science China(Technological sciences) 2020年第4期63卷 578-588页

作者： LIN Cheng ZHANG LiJin LIU YanJu LIU LiWu LENG JinSong Department of Astronautic Science and Mechanics Harbin Institute of Technology(HIT)Harbin 150001China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology(HIT)Harbin 150080China

Four-dimensional(4D)printing,integrates transformation information into three-dimensional(3D)-printed structures,which means that 3D-printed structures are able to change their shapes,properties,or functionalities over ***,two types of shape memory personalized vascular stents with negative Poisson’s ratio structure are developed via 4D *** genetic algorithm is used to optimize the *** compression tests,radial compression tests and three-point bending tests are carried out to study the mechanical properties of the *** addition,fluid-structure interaction and stress distribution during the shape recovery process are investigated based on finite element *** shape memory behaviors of the stents are excellent and in vitro feasibility tests demonstrate that the stents can expand the simulated narrow blood vessel ***,4D printed shape memory stents with negative Poisson’s ratio structure are highly promising for the treatment of vascular stenosis.

关键词： shape memory polymer 4D printing biodegradable vascular stents finite element analysis negative Poisson's ratio

来源：评论

学校读者我要写书评

暂无评论

An Insight into the Low-Velocity Impact Behavior and Failure Mechanisms of Cfrp/Al Bonded Structures

SSRN

引用

SSRN 2023年

作者： Hu, Chunxing Xu, Zhonghai Liu, Xiangjun Cai, Chaocan Zou, Xiaocan He, Xiaodong National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin150080 China Shenzhen STRONG Advanced Materials Research Institute Co. Ltd Shenzhen518000 China

Experimental and numerical methods are used to investigate the effects of different impact surfaces and energies on the mechanical properties and failure behavior of CFRP/Al adhesively bonded structures. To predict the damage initiation and propagation of CFRP laminates, interlaminar and adhesive layer, and aluminum alloy plates, the integrated finite element model (FEM) containing both low-velocity impact (LVI) and axial tensile after impact (TAI) processes is developed by combining continuum damage mechanics (CDM) model, cohesive zone model (CZM), and Johnson-Cook (JC) model. Additionally, LVI and TAI tests have been performed with aluminum alloy 5182 (AA5182) and CFRP laminate as impact surfaces, which verify the effectiveness of the proposed integrated FEM. The results indicate that AA5182, as the impact surface, produces greater impact damage (maximum crater depth (MCD) and opening width (OW)) in the center of the overlap region in comparison with the CFRP. The residual bearing capacity of the joints is the result of the competition between impact behavior and mechanical interlocking. The tensile strength, stiffness, and failure displacement of the joints decrease with the increase of impact energy. The failure modes of the joints include annular and circular cohesive failure of the adhesive layer in the impact region, interface failure, cohesive failure and peeling failure in the non-impact region, delamination damage, and fiber pullout and matrix cracking of the CFRP laminate. © 2023, The Authors. All rights reserved.

关键词： Aluminum alloys

来源：评论

学校读者我要写书评

暂无评论

Unsteady Coupled Heat Transfer Simulation of Unsteady numerical simulation of slot flow in anti-heating tile 3

Unsteady Coupled Heat Transfer Simulation of Unsteady numeri...

引用

3rd International Conference on Green Energy and Sustainable Development, GESD 2020

作者： Wang, Qiang Li, Wei Yao, Yongtao School of Energy and Power North University of China Taiyuan China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin China

An unsteady coupled heat transfer solver is developed in the study. The coupled solver, solving the partial differential equations for fluid flow and thermal conduction in the solid, is employed to predict the unsteady heat and transfer in the anti-heating tile. The influence of gap depth on the fluid flow and solid thermal conduction is studied. The results show that the flow field distribution between the different gap depths is similar, otherwise reducing the gap depth is conducive to reducing the thermal load in the bottom plate. © Published under licence by IOP Publishing Ltd.

关键词： Flow of 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：