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Three-dimensional Bose Einstein condensate vortex solitons under optical lattice and harmonic confinements

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Chinese Physics B 2013年第3期22卷 184-191页

作者：王莹宗丰德李峰波 Institute of Nonlinear Physics Zhejiang Normal University

We predict three-dimensional vortex solitons in a Bose-Einstein condensate under a complex potential,which is the combination of a two-dimensional parabolic trap along the transverse radial direction and a one-dimensional optical-lattice potential along the z axis *** vortex solitons are built in the form of a layer-chain structure made of several fundamental vortices along the optical-lattice *** has not been reported before in the three-dimensional Bose-Einstein *** using a combination of the energy density functional method with direct numerical simulation,we find three-dimensional vortex solitons with topological charges χ=1,χ=2,and χ=***,the macroscopic quantum tunneling and chirp phenomena of the vortex solitons are shown in the ***,the occurrence of macroscopic quantum tunneling provides the possibility for the experimental realization of quantum ***,we successfully manipulate the vortex solitons along the optical lattice *** stability limits for dragging the vortex solitons from an initial fixed position to a prescribed location are further pursued.

关键词： Bose-Einstein condensates Gross-Pitaevskii equation vortex soliton manipulation

Development of micro-and nanorobotics: A review

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Science China(Technological Sciences) 2019年第1期62卷 1-20页

作者： YANG Jia ZHANG Chuang WANG XiaoDong WANG WenXue XI Ning LIU LianQing State Key Laboratory of Robotics Shenyang Institute of Automation Chinese Academy of Sciences University of Chinese Academy of Sciences Emerging Technologies Institute Department of Industrial & Manufacturing Systems Engineering University of Hong Kong

Micro-and nanorobotic is an emerging field of research arising from the cross-fusion of micro/nano technology and robotics and has become an important part of robotics. Micro-and nanorobots have the advantages of small size, low weight, large thrust-toweight ratio, high flexibility, and high sensitivity. Due to the characteristics distinguishing from macroscopic robots, micro-and nanorobots have stimulated the research interest of the scientific community and opened up numerous application fields such as drug delivery and disease diagnosis. In the past 30 years, research on micro-and nanorobots has made considerable *** article provides a comprehensive overview of the development of these robots. First, the application of the robots is reviewed. Then, the key components of the robots are discussed separately, covering their actuation, design, fabrication and control. In addition, from the perspectives of intelligence and sensing, clinical applications, materials and performance, the challenges that may be encountered in the development of such robots in the future are discussed. Finally, the entire article is summarized, and concepts for future micro-and nanorobots are described.

关键词： micro-and nanorobots magnetic actuation manipulation biohybrid robot

Complementary transmissive ultra-thin meta-deflectors for broadband polarization-independent refractions in the microwave region

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Photonics Research 2019年第1期7卷 80-88页

作者： YUEYI YUAN KUANG ZHANG XUMIN DING BADREDDINE RATNI SHAH NAWAZ BUROKUR QUN WU Department of Microwave Engineering Harbin Institute of Technology State Key Laboratory of Millimeter Waves LEME UPL Université Paris Nanterre

Polarization manipulation is a significant issue for artificial modulation of the electromagnetic(EM) wave, but general mechanisms all suffer the restriction of inherent symmetric properties between opposite ***, a strategy to independently and arbitrarily manipulate the EM wave with orthogonal circular polarizations based on a metasurface is proposed, which effectually breaks through traditional symmetrical characteristics between orthogonal handedness. By synthesizing the propagation phase and geometric phase, the appropriate Jones matrix is calculated to obtain independent wavefront manipulation of EM waves with opposite circular polarizations. Two transmissive ultra-thin meta-deflectors are proposed to demonstrate the asymmetrical refraction of transmitted circularly polarized waves in the microwave region. Simulated transmitted phase front and measured far-field intensity distributions are in excellent agreement, indicating that the transmitted wave with different polarizations can be refracted into arbitrary and independent directions within a wide frequency band(relative bandwidth of 25%). The results presented in this paper provide more freedom for the manipulation of EM waves, and motivate the realizations of various polarization-independent properties for all frequency spectra.

关键词： Polarization manipulation general mechanisms effectually breaks

Conceptual exploration of a gravity-assisted electrorheological fluid-based gripping methodology for assistive technology

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Bio-Design and Manufacturing 2019年第3期2卷 145-152页

作者： Ivo Radice Jeroen H.M.Bergmann Department of Engineering Science Old Road Campus Research BuildingInstitute of Biomedical EngineeringUniversity of OxfordHeadingtonOxfordUK

Gripping devices help patients carry out everyday tasks and increase their ***,there seems to be a lack of bionic gripping technologies that can fully adapt to any possible shape,as the use of artificial fingers and predetermined grip settings limits the operating *** development of a more agile device,which is operated by a simple control paradigm,could greatly benefit *** electrorheological(ER)fluid system should be able to adapt to the shape of an object and then hold that *** aim of this study was to explore if a conceptual prototype of an ER system could hold a geometric shape when it is activated.A test rig was constructed with a moving part(set in different silicone oils)that could be displaced using a *** particles were dispersed in the silicone oils,and a field with a voltage of 4 kV mm?1 was generated to activate the *** results show that the developed system can support an increased force when activated and hold a simple geometric position without any noticeable *** outcome provides an initial proof of concept for a possible new(gravity-assisted)gripping approach using smart fluids,which could be developed with materials that are biocompatible and widely available.

关键词： Smart materials Prosthetics Exoskeleton Grasping manipulation Assistive technologies

Using magnetic nanoparticles to manipulate biological objects

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Chinese Physics B 2013年第9期22卷 29-39页

作者：刘毅高宇徐臣杰 Division of BioEngineering School of Chemical and Biomedical EngineeringNanyang Technological University

The use of magnetic nanoparticles （MNPs） for the manipulation of biological objects, including proteins, genes, cellular organelles, bacteria, cells, and organs, are reviewed. MNPs are popular candidates for controlling and probing biological objects with a magnetic force. In the past decade, progress in the synthesis and surface engineering of MNPs has further enhanced this popularity.

关键词： magnetic nanoparticles manipulation biological objects

Fabrication of robust aluminum–carbon nanotube composites using ultrasonic assembly and rolling process

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International Journal of Minerals,Metallurgy and Materials 2021年第1期28卷 160-167页

作者： Shahab Shahsavar Mostafa Ketabchi Saeed Bagherzadeh Department of Mining and Metallurgical Engineering Amirkabir University of TechnologyTehranIran Department of Mechanical Engineering Technology School of Engineering TechnologyPurdue UniversityWest Lafayette47906USA

This study introduced a novel fabrication of aluminum–carbon nanotube(CNT) composites by employing bulk acoustic waves and accumulative roll bonding(ARB).In this method, CNT particles were aligned using ultrasonic standing wave in an aqueous media, and the arrayed particles were precipitated on the aluminum plate ***, the plates rolled on each other through the ARB process with four *** and scanning electron micrographs demonstrated the effective aligning of CNTs on the aluminum substrate with a negligible deviation of arrayed CNTs through the ARB *** X-ray diffraction pattern of the developed composites showed no peaks for carbon and aluminum *** addition, tensile tests showed that the longitudinal strength of the specimens processed with aligned CNTs was significantly greater than that of the specimens with common randomly dispersed *** proposed technique is beneficial for the fabrication of Al–CNT composites with directional mechanical strength.

关键词： aluminum–carbon nanotube composite ultrasonic manipulation strength microstructure

Dynamics of magnetic skyrmions

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Chinese Physics B 2015年第1期24卷 20-35页

作者：刘冶华李有泉 Department of Physics Zhejiang University

We review the recent progress on the magnetic skyrmions in chiral magnetic materials. The magnetic skyrmion is a topological spin configuration with localized spatial extent, which could be thought of as an emergent rigid particle, owing to its particular topological and chiral properties. Static skyrmionic configurations have been found in various materials with different transport and thermodynamic properties. The magnetic skyrmions respond to externally applied fields in a very unique way, and their coupling to other quasiparticles in solid-state systems gives rise to the emergent *** not only theoretically important, the magnetic skyrmion is also very promising to be the information carrier in next generation spintronic devices.

关键词： skyrmion chiral magnet manipulation

Multiple trapping using a focused hybrid vector beam

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Chinese Physics B 2019年第9期28卷 186-192页

作者： Li Zhang Xiaodong Qiu Lingwei Zeng Lixiang Chen School of Physics and Optoelectronic Engineering Foshan UniversityFoshan 528000China Department of Physics Collaborative Innovation Center for Optoelectronic Semiconductors and Efficient Devicesand Jiujiang Research InstituteXiamen UniversityXiamen 361005China

We propose a simple and efficient method that uses a single focused hybrid vector beam to confine metallic Rayleigh particles at multiple *** study the force mechanisms of multiple trapping by analyzing the gradient and scattering *** is observed that the wavelength and topological charges of the hybrid vector beam regulate the trapping positions and number of optical trap *** proposed method can be implemented easily in three-dimensional space, and it facilitates both trapping and organization of ***, it can provide an effective and controllable means for nanoparticle manipulation.

关键词： multiple trapping focused hybrid vector beam nanoparticle manipulation

Strong Correlation and Anticorrelation via Phase-Dependent Coherent Population Trapping

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Chinese Physics Letters 2008年第2期25卷 493-496页

作者：彭延东胡响明龚成 Department of Physics Huazhong Normal University Wuhan 430079

We present the phase control of photon correlations in a driven four-level system in the double lambda configuration. The strong correlation and the anticorrelation are. obtained when the collective phase of four applied laser fields is varied. The coherent control is based on the phase-dependent coherent population trapping （CPT）. The strong correlation occurs when the system operates near CPT, while the anticorrelation occurs when the system is far away from CPT.

关键词： ELECTROMAGNETICALLY INDUCED TRANSPARENCY QUANTUM INTERFERENCE SPONTANEOUS EMISSION INVERSION manipulation PHOTONS OPTICS