检索结果-内蒙古大学图书馆

Approach to fully decomposing an optical force into conservative and nonconservative components

Physical Review A 2019年第3期100卷 033821-033821页

作者： Xinning Yu Yikun Jiang Huajin Chen Shiyang Liu Zhifang Lin State Key Laboratory of Surface Physics (SKLSP) Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education) and Department of Physics Fudan University Shanghai 200433 China Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing 210093 China School of Electrical and Information Engineering Guangxi University of Science and Technology Liuzhou Guangxi 545006 China Institute of Information Optics Zhejiang Normal University Jinhua Zhejiang 321004 China

One of the theoretical challenges in studying optical trapping is the decomposition of the optical force into the gradient force (conservative component) and scattering force (nonconservative component), which can be achieved either for Raleigh particles or for very large particles in the regime of ray optics. However, for the moderate particles in between these two limits, the scenario is still a mystery. In this paper we present a theoretical approach to bridge this gap and fully split the optical force acting on a spherical particle immersed in a generic monochromatic free-space optical field into two such essentially different components, which is efficient even for large particles with the exact consideration of light polarization, thus offering a benchmark for examining the effective range for application of ray optics. Our approach models general optical fields by a series of homogeneous plane waves. The analytical expressions for the gradient and scattering parts of the optical force exerted on a spherical particle of arbitrary size illuminated by multiple interferential plane waves are then derived. As examples of applications, we investigate the gradient and scattering forces acting on a dielectric particle immersed in the Bessel beam. Our results are in excellent agreement with those obtained based on ray optics methods when the illuminated particle is large enough, while exhibiting effects of Mie resonance that are totally missing in the ray optics for moderate particle sizes. Finally, we study the effect of particle size on the gradient force acting on a spherical particle sitting in multiple interferential plane waves. Our extensively numerical results, up to a size as large as 2000 illuminating wavelengths, suggest an overall decreasing tendency in the ratio of the magnitude of the gradient force to that of the total force as the particle size increases.

关键词： Light-matter interaction Optical lattices & traps Optomechanics Plasmonics

来源：评论

学校读者我要写书评

暂无评论

Numerical investigation of deposition mechanism of submarine debris flow 7

Numerical investigation of deposition mechanism of submarine...

引用

7th International Conference on Debris-Flow Hazards Mitigation: Mechanics, Monitoring, Modeling, and Assessment

作者： Liu, Dingzhu Cui, Yifei Choi, Clarence E. Bazai, Nazir Ahmed Yu, Zhilin Lei, Mingyu Yin, Yanzhou Key Laboratory of Mountain Hazards and Earth Surface Process Institute of Mountain Hazards and Environment Chinese Academy of Sciences Chengdu610041 China University of Chinese Academy of Sciences Beijing100049 China Department of Civil and Environmental Engineering Hong Kong University of Science and Technology Clear Water Bay Hong Kong Hong Kong HKUST Jockey Club Institute for Advanced Study HKSAR Hong Kong Hong Kong Southwest Electric Power Design Institute Chengdu610021 China

ISBN: (纸本)9780578510828

Submarine debris flow can damage oil and gas transport pipelines with potentially adverse consequences to the environment and to the industrial activity itself. The deposition process of submarine debris flow, which is related to the flow viscosity, is complex due to the slurry diffusion process that happens during the interaction of water and slurry. In addition, a quantitative characterization of the characterize the flow mechanism as influenced by the material density during the deposition process remains a scientific challenge. To fundamentally understand the mechanisms of solid-fluid interactions in fast-flowing submarine debris flows, a series of three-dimensional (3D) numerical simulations using Computational Fluid Dynamics (CFD) were conducted. The Herschel-Bulkley (HB) model was used to define the submarine slurry’s rheological characterization as calibrate through simple rheological experiment. Results reveal that deposition is a mass diffusion process. Shear stress at the bottom and at the top of the slurry leads to velocity differences in the vertical direction which in turn generates a huge vortex, which contributed to a separation of slurry into two parts: the frontal head, and the tail. The velocity difference in vertical direction is helpful for hydroplaning. For higher slurry viscosity case, the flow profile is longer and thicker with a front head that has a lower averaged densities and sharper head angles. In addition, highly viscous slurries have lower average frontal velocities during the deposition process. The mixture density decreases in two stages: quick decreasing stage and stable decreasing stage. In the first stage, the slurry expands quicker than the second stage. Higher viscosities also lead to larger volume expansions which consequently leads to quicker density decrease. © 2019 Debris-Flow Hazards Mitigation: Mechanics, Monitoring, Modeling, and Assessment - Proceedings of the 7th International Conference on Debris-Flow Hazards Mitigati

关键词： Computational fluid dynamics

来源：评论

学校读者我要写书评

暂无评论

Microstructure and mechanical properties at elevated temperature of Mg-Al-Ni alloys prepared through powder metallurgy

引用

Journal of Materials Science & technology 2017年第9期33卷 947-953页

作者： Legan Hou Bingcheng Li Ruizhi Wu Lin Cui Peng Ji Ruiying Long Jinghua Zhang Xinlin Li Anping Dong Baode Sun Key Laboratory of Superlight Materials & Surface Technology Ministry of EducationHarbin Engineering University College of Civil and Architectural Engineering Heilongjiang Institute of Technology Shanghai Key Laboratory of Advanced High-temperature Materials and Precision Forming Shanghai Jiao Tong University

Mg-Al-Ni alloys were prepared by powder metallurgy, and their microstructure and elevated temperature mechanical properties were investigated. Results indicate that, in addition to α-Mg matrix, both coarse Al;Ni;particles and fine Al Ni nano-particles exist in the Mg-Al-Ni alloys. The strength at 150?C is improved with the increase in Ni content. Mg-18.3Al-8Ni alloy possesses a compressive strength of234.7 MPa and a yield strength of 146.5 MPa. Plasticity is also improved with a low concentration of Ni. Mg-11.3Al-2Ni alloy possesses a compression ratio of 17.3%. The phases of Al;Ni;and Al Ni in the alloys block the movements of grain boundaries and dislocations during the deformation at elevated temperature. The existence of Al Ni phase provides a non-basal slip system, leading to the improvement in plasticity. Finally, the formation mechanism of Al-Ni phases in the process is discussed with thermodynamics and kinetics.

关键词： Mg-Al-Ni alloy Powder metallurgy Al3Ni2 AlNi

来源：评论

学校读者我要写书评

暂无评论

Magnetotransport in Al6Re

arXiv

引用

arXiv 2019年

作者： Cheng, Erjian Peets, Darren C. Xi, Chuanying Huang, Yeyu Pi, Li Li, Shiyan State Key Laboratory of Surface Physics Department of Physics Laboratory of Advanced Materials Fudan University Shanghai200438 China Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo Zhejiang315201 China Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field Laboratory of the Chinese Academy of Sciences Hefei Anhui230031 China Collaborative Innovation Center of Advanced Microstructures Nanjing210093 China

Since very few Type-I superconductors are known and most are elemental superconductors, there are very few experimental platforms where the interaction between Type-I superconductivity and topologically nontrivial band structure can be probed. The rhenium aluminide Al6Re has recently been identified as a Type-I superconductor with a transition of 0.74 K and a critical field of ∼50 Oe. Here, we report its magnetotransport behavior including de Haas-van Alphen (dHvA) and Shubnikov-de Haas (SdH) oscillations. Angular dependence of the magnetoresistance reveals a highly anisotropic Fermi surface with dominant hole character. From the strong oscillatory component ∆Rxx in high magnetic fields up to 33 T, the Landau index infinite-field intercept in the case of a single oscillation frequency, and the phase factor where multiple frequencies coexist, are both ∼1/4. This intermediate value is suggestive of possible nontrivial band topology but does not allow strong conclusions. Copyright © 2019, The Authors. All rights reserved.

关键词： Topology

来源：评论

学校读者我要写书评

暂无评论

Abruptly autofocusing property and optical manipulation of circular Airy beams

引用

Physical Review A 2019年第1期99卷 013817-013817页

作者： Wanli Lu Xu Sun Huajin Chen Shiyang Liu Zhifang Lin School of Physical Science and Technology China University of Mining and Technology Xuzhou Jiangsu 221116 China School of Electrical and Information Engineering Guangxi University of Science and Technology Liuzhou Guangxi 545006 China State Key Laboratory of Surface Physics and Department of Physics Fudan University Shanghai 200433 China Institute of Information Optics Zhejiang Normal University Jinhua Zhejiang 321004 China Key Laboratory of Micro and Nano Photonic Structures Fudan University Shanghai 200433 China Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing 210093 China

By employing the angular spectrum representation, we successfully derive the partial-wave expansion coefficients of the circular Airy beams (CABs) with different polarizations, based on which the scattering of a spherical particle in the CABs is solved exactly. Special attention is focused on exploring the potential applications of the CABs in the abruptly autofocusing (AAF) property and optical manipulation of microparticle by optical force. It is found that both the linear and circular polarizations are the best candidates to implement the AAF property robustly against strong disturbance by a large-sized particle. In addition, although the CABs can be intensively focused to a small region, resulting in an abrupt increase of light intensity by two orders of magnitude at the focal point and enabling three-dimensional stable trapping of a Rayleigh particle near the focal point, the usual CABs fail to generate an optical force outweighing the Brownian force to achieve a stable transverse trapping in the region before the focal point. On the other hand, a Mie particle can be confined transversely in the primary ring and accelerated along the curved trajectory of CABs to the focal point, then pushed further all the way through the focal point rather than being trapped therein, and eventually accelerated further along a straight trajectory in the direction of light propagation over 100 wavelengths, due to the weak diffraction characteristic of a morphed Bessel-like beam of CABs. The exotic curved-straight trajectory transport of particles by the CABs may find applications in the case where the transport path is partly blocked.

关键词： Light-matter interaction Optomechanics Scattering theory

来源：评论

学校读者我要写书评

暂无评论

Micro-Supercapacitors: Aqueous MXene/PH1000 Hybrid Inks for Inkjet-Printing Micro-Supercapacitors with Unprecedented Volumetric Capacitance and Modular Self-Powered Microelectronics (Adv. Energy Mater. 23/2021)

引用

advanced Energy Materials 2021年第23期11卷

作者： Jiaxin Ma Shuanghao Zheng Yuexian Cao Yuanyuan Zhu Pratteek Das Hui Wang Yu Liu Jiemin Wang Liping Chi Shengzhong (Frank) Liu Zhong-Shuai Wu State Key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences 457 Zhongshan Road Dalian 116023 China University of Chinese Academy of Sciences 19 A Yuquan Road Shijingshan District Beijing 100049 China Dalian National Laboratory for Clean Energy Chinese Academy of Sciences 457 Zhongshan Road Dalian 116023 China College of Materials Science and Engineering Dalian Jiaotong University 794 Huanghe Road Dalian 116028 China Key Laboratory of Applied Surface and Colloid Chemistry Ministry of Education Shaanxi Key Laboratory for Advanced Energy Devices Shaanxi Engineering Lab for Advanced Energy Technology School of Materials Science and Engineering Shaanxi Normal University 620 West Chang'an Street Xi'an 710119 China

来源：评论

学校读者我要写书评

暂无评论

Designing Polymer-in-Salt Electrolyte and Fully Infiltrated 3D Electrode for Integrated Solid-State Lithium Batteries

引用

Angewandte Chemie 2021年第23期133卷

作者： Wenyi Liu Chengjun Yi Linpo Li Shuailei Liu Qiuyue Gui Deliang Ba Prof. Yuanyuan Li Prof. Dongliang Peng Prof. Jinping Liu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing and School of Chemistry Chemical Engineering and Life Science Wuhan University of Technology Wuhan Hubei 430070 P. R. China School of Optical and Electronic Information Huazhong University of Science and Technology Wuhan 430074 P. R. China State Key Lab of Physical Chemistry of Solid Surface Fujian Key Laboratory of Materials Genome Collaborative Innovation Center of Chemistry for Energy Materials College of Materials Xiamen University Xiamen 361005 P. R. China

Solid-state lithium batteries (SSLBs) are promising owing to enhanced safety and high energy density but plagued by the relatively low ionic conductivity of solid-state electrolytes and large electrolyte–electrode interfacial resistance. Herein, we design a poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP)-based polymer-in-salt solid electrolyte (PISSE) with high room-temperature ionic conductivity (1.24×10 −4 S cm −1 ) and construct a model integrated TiO 2 /Li SSLB with 3D fully infiltration of solid electrolyte. With forming aggregated ion clusters, unique ionic channels are generated in the PISSE, providing much faster Li + transport than common polymer electrolytes. The integrated device achieves maximized interfacial contact and electrochemical and mechanical stability, with performance close to liquid electrolyte. A pouch cell made of 2 SSLB units in series shows high voltage plateau (3.7 V) and volumetric energy density comparable to many commercial thin-film batteries.

关键词： 3D electrolyte infiltration interfacial engineering nanostructured thin-film batteries polymer-in-salt electrolytes solid-state lithium batteries

来源：评论

学校读者我要写书评

暂无评论

A hybrid invisibility cloak based on integration of transparent metasurfaces and zero-index materials

引用

Light(Science & Applications) 2018年第1期7卷 548-555页

作者： Hongchen Chu Qi Li Bingbing Liu Jie Luo Shulin Sun Zhi Hong Hang Lei Zhou Yun Lai School of Physical Science and Technology and Collaborative Innovation Center of Suzhou Nano Science and Technology Soochow University215006 SuzhouChina State Key Laboratory of Surface Physics and Key Laboratory of Micro and Nano Photonic Structures(Ministry of Education) Fudan University200433 ShanghaiChina Collaborative Innovation Center of Advanced Microstructures 210093 NanjingChina Shanghai Engineering Research Center of Ultra-Precision Optical Manufacturing Green Photonics and Department of Optical Science and EngineeringFudan University200433 ShanghaiChina State Key Laboratory of Applied Optics Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of Sciences130033 ChangchunChina National Laboratory of Solid State Microstructures School of PhysicsNanjing University210093 NanjingChina

The invisibility cloak,a long-standing fantastic dream for humans,has become more tangible with the development of ***,metasurface-based invisibility cloaks have been proposed and realized with significantly reduced thickness and complexity of the cloaking ***,the previous scheme is based on reflection-type metasurfaces and is thus limited to reflection *** this work,by integrating the wavefront tailoring functionality of transparent metasurfaces and the wave tunneling functionality of zero-index materials,we have realized a unique type of hybrid invisibility cloak that functions in transmission *** principle is general and applicable to arbitrary *** experimental demonstration,we constructed a rhombic double-layer cloaking shell composed of a highly transparent metasurface and a double-zero medium consisting of dielectric photonic crystals with Dirac cone *** cloaking effect is verified by both full-wave simulations and microwave experimental *** principle also reveals exciting possibilities for realizing skin-thick ultrathin cloaking shells in transmission geometry,which can eliminate the need for spatially varying extreme *** work paves a path for novel optical and electromagnetic devices based on the integration of metasurfaces and metamaterials.

关键词： transparent integration eliminate

来源：评论

学校读者我要写书评

暂无评论

Pressure-induced large enhancement of Néel temperature and electric polarization in the hexagonal multiferroic Lu0.5Sc0.5FeO3

引用

Physical Review B 2019年第21期100卷 214408-214408页

作者： Fengliang Liu Changsong Xu Shoudong Shen Nana Li Hangwen Guo Xujie Lü Hongjun Xiang L. Bellaiche Jun Zhao Lifeng Yin Wenge Yang Wenbin Wang Jian Shen State Key Laboratory of Surface Physics and Department of Physics Fudan University Shanghai 200433 China Center for High Pressure Science and Technology Advanced Research (HPSTAR) Shanghai 201203 China Physics Department and Institute for Nanoscience and Engineering University of Arkansas Fayetteville Arkansas 72701 USA Institute for Nanoelectronic Devices and Quantum Computing Fudan University Shanghai 200433 China Collaborative Innovation Center of Advanced Microstructures Nanjing 210093 China

Hexagonal ferrites (h−RFeO3) have attracted great attention for their high ferroelectric transition temperature, strong magnetoelectric couplings, and tunable Néel temperature (TN) and electric polarization. While introducing structural distortion has been previously found to be effective to raise TN and polarization in h−RFeO3, it is generally difficult to create sizable structural distortion by common approaches including substrate-induced epitaxial strain and chemical doping. Here, we use high-pressure x-ray-diffraction measurements to show that pressure can generate large structural distortion and R-layer displacement of h−RFeO3, resulting with dramatically enhancement of polarization and TN. Density-functional theory calculations reveal that the enlarged c/a ratio results in an ∼70 K increase of TN along with a significant enhancement of ferroelectric polarization. Our results suggest that pressure is effective to tune structural distortions and related multiferroicity of the h−RFeO3 system, making h−RFeO3 a promising material for spintronic applications.

关键词： Crystal structure Ferroelectricity First-principles calculations Magnetic phase transitions Pressure effects Multiferroics Density functional calculations X-ray diffraction

来源：评论

学校读者我要写书评

暂无评论

The study of intrinsic defect state of FeSe with scanning tunneling microscopy

arXiv

引用

arXiv 2019年

作者： Bu, Kunliang Wang, Bo Zhang, Wenhao Fei, Ying Zheng, Yuan Ai, Fangzhou Wu, Zongxiu Wang, Qisi Wo, Hongliang Zhao, Jun Jin, Chuanhong Yin, Yi Zhejiang Province Key Laboratory of Quantum Technology and Device Department of Physics Zhejiang University Hangzhou310027 China State Key Laboratory of Silicon Materials School of Materials Science and Engineering Zhejiang University Hangzhou310027 China State Key Laboratory of Surface Physics Department of Physics Fudan University Shanghai200433 China Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing210093 China

We apply high resolution scanning tunneling microscopy to study intrinsic defect states of bulk FeSe. Four types of intrinsic defects including the type I dumbbell, type II dumbbell, top-layer Se vacancy and inner-layer Se-site defect are extensively analyzed by scanning tunneling spectroscopy. From characterized depression and enhancement of density of states measured in a large energy range, the type I dumbbell and type II dumbbell are determined to be the Fe vacancy and SeFe defect, respectively. The top-layer Se vacancy and possible inner-layer Se-site vacancy are also determined by spectroscopy analysis. The determination of defects are compared and largely confirmed in the annular dark-field scanning transmission electron microscopy measurement of the exfoliated FeSe. The detailed mapping of defect states in our experiment lays the foundation for a comparison with complex theoretical calculations in the future. Copyright © 2019, The Authors. All rights reserved.

关键词： Scanning tunneling microscopy

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：