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Trimer superfluid induced by photoassocation on the state-dependent optical lattice

Physical Review A 2014年第3期90卷 033622-033622页

作者： Wanzhou Zhang Ran Li W. X. Zhang C. B. Duan T. C. Scott College of Physics and Optoelectronics Taiyuan University of Technology Shanxi 030024 China Key Laboratory of Advanced Transducers and Intelligent Control System Ministry of Education Taiyuan University of Technology Shanxi 030024 China Center for Applied Physics and Technology Peking University Beijing 100871 China College of Science Chang an University Xian 710064 China

We use the mean-field method, the quantum Monte Carlo method and the density-matrix-renormalization-group method to study the trimer superfluid phase and the quantum phase diagram of the Bose-Hubbard model in a one-dimensional optical lattice, with an explicit trimer-tunneling term. Theoretically, we derive the explicit trimer hopping terms, such as ai3†aj3, by the Schrieffer-Wolf transformation. In practice, the trimer superfluid described by these terms is driven by photoassociation. The phase transition between the trimer superfluid phase and other phases are also studied. Without the on-site interaction, the phase transition between the trimer superfluid phase and the Mott insulator phase is continuous. Turning on the on-site interaction, the phase transitions are first order with Mott insulators of atoms filling 1 and 2. With nonzero atom tunneling, the phase transition is first order from the atom superfluid to the trimer superfluid. In the trimer superfluid phase, the winding numbers can be divided by three without any remainder. The power-law decay exponent is 1/2 for the nondiagonal correlation ai†3aj3, i.e., the same as the exponent of the correlation ai†aj in hardcore bosons. The density-dependent atom-tunneling term ni2ai†aj and pair-tunneling term niai†2aj2 are also studied. With these terms, the phase transition from the empty phase to atom superfluid is first order and different from the cases without the density-dependent terms. The effects of finite three-body interactions and finite temperatures are also studied. Our results will be helpful in realizing the trimer superfluid by a cold-atom experiment.

关键词： OPTICAL lattices SUPERFLUIDITY QUANTUM Monte Carlo method RENORMALIZATION group DENSITY matrices MEAN field theory

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Comparative study of two 3-CRU translational parallel manipulators

Comparative study of two 3-CRU translational parallel manipu...

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IEEE International Conference on Robotics and Biomimetics

作者： Bin Li Yangmin Li Xinhua Zhao Weimin Ge Tianjin Key Laboratory of the Design and Intelligent Control of the Advanced Mechatronical System Tianjin China Department of Electromechanical Engineering University of Macau Taipa Macao SAR China

ISBN: (纸本)9781479973989

Two types of 3-CRU translational parallel manipulators (TPM) are compared and investigated in this paper. The two 3-CRU TPMs have identical kinematics, but some differences exist in terms of the chain arrangement, one is in fully symmetrical chain arrangement, called symmetrical 3-CRU TPM, the other one is in asymmetrical chain arrangement, called asymmetrical 3-CRU TPM. This paper focuses on discussing the differences between the two 3-CRU TPMs in kinematics, workspace and performance. This study provides insights into parallel manipulators with identical kinematics arranged differently.

关键词： Manipulators Joints Kinematics Actuators Layout Rails Integrated circuits

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Simultaneous Excitation and Emission Enhancements in Upconversion Luminescence Using plasmonic Double-resonant Gold Nanorods

Simultaneous Excitation and Emission Enhancements in Upconve...

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第三届等离激元光子学前沿国际会议

作者： Xin Liu Dangyuan Lei Key Lab of Advanced Transducers and Intelligent Control System of Ministry of Education and College of Physics and Optoelectronics Taiyuan University of Technology Department of Applied Physics The Hong Kong Polytechnic University Shenzhen Research Institute The Hong Kong Polytechnic University

＜正＞Enhancing the quantum efficiency of lanthanide-doped upconversion nanocrystals is crucial for applying them in fluorescence imaging,biosensing and optoelectronic applications[1,2].Here we demonstrate numerically...

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Absorption enhancement in organic solar cells based on the plasmonic hot spot effect

Absorption enhancement in organic solar cells based on the p...

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Asia Communications and Photonics Conference, ACP 2013

作者： Zhang, Ye Wang, Wenyan Cui, Yanxia Li, Zhanfeng Ji, Ting Hao, Yuying Key Laboratory of Advanced Transducers and Intelligent Control System College of Physics and Optoelectronics Taiyuan University of Technology Taiyuan 030024 China

By introducing metallic nanostrips in organic solar cells with the excitation of the plasmonic hot spot effect, we improve light absorption in active layer by 24 % in comparison with the corresponding planar device. &... 详细信息

ISBN: (纸本)9781557529893

关键词： Organic solar cells

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Inverse dynamics analysis of a 6-PSS parallel manipulator

Lecture Notes in Computer Science (including subseries Lectu...

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Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2014年 8918卷 12-23页

作者： Xu, Weiyuan Li, Yangmin Lu, Song Xiao, Xiao Department of Electromechanical Engineering University of Macau Avenida da Universidade Taipa Macao SAR China Tianjin Key Laboratory of the Design and Intelligent Control of the Advanced Mechatronical System Tianjin University of Technology Tianjin300384 China

In this paper, a new six degrees of freedom (6-DOF) parallel manipulator with adjustable actuators is proposed. The kinematic model is firstly established and the kinematic analysis is performed afterward. Then the equations of motion are developed based on the concept of link Jacobian matrices. Finally, the principle of virtual work is applied to analyze the dynamics of this 6-PSS parallel manipulator. This methodology can be used on other types of parallel manipulators not only for 6-DOF but also with less than 6-DOF. To solve the inverse dynamics of the manipulator, a computational algorithm is developed and two trajectories of the moving platform are simulated. © Springer International Publishing Switzerland 2014.

关键词： Dynamics

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Design and analysis of a decoupled XY micro compliant parallel manipulator

Design and analysis of a decoupled XY micro compliant parall...

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IEEE International Conference on Robotics and Biomimetics

作者： Bingxiao Ding Yangmin Li Tianjin Key Laboratory of the Design and Intelligent Control of the Advanced Mechatronical System Tianjin University of Technology Tianjin China Department of Electromechanical Engineering University of Macau Avenida da Universidade China

ISBN: (纸本)9781479973989

In this paper, a new compliant parallel mechanism driven by piezoelectric actuators is designed, which is a modified structure from our previous designed stage. In order to compensate the limited stroke of PZT, the secondary amplification mechanism was adopted in this design, and also the matrix method is utilized to calculate its stiffness and compliance for this compliant mechanism. In practical application, the accuracy of mechanism is an essential index that we wish to achieve, meanwhile the parasitic motion analysis, dynamic and static analysis are also presented in this paper. The method is validated by finite element analysis to demonstrate its effectiveness.

关键词： Fasteners Mathematical model Force Transmission line matrix methods Accuracy Analytical models Kinetic energy

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Design and Analysis of a Spatial 2-RPU & SPR Parallel Manipulator with 1T2R-Type

Design and Analysis of a Spatial 2-RPU & SPR Parallel Manipu...

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International Conference on control, Automation, Robotics & Vision

作者： Bin Li Yangmin Li Xinhua Zhao Yuwei Yang Department of Electromechanical Engineering University of Macau Taipa Macao SAR China Tianjin Key Laboratory of the Design and Intelligent Control of the Advanced Mechatronical System Tianjin University of Technology Tianjin 300384 China

ISBN: (纸本)9781479952007

A spatial 2-RPU&SPR parallel manipulator (PM) with three degrees of freedom (DOF) is proposed in this paper. The architecture of the manipulator is comprised of a moving platform attached to a base through two revolute-prismatic-universal jointed serial linkages and one spherical-prismatic-revolute jointed serial linkage. The prismatic motions of the prismatic joints are considered to be actively actuated. The moving platform of the manipulator has one-translational and two rotational (1T2R) DOFs with respect to the fixed base. The kinematics including forward and inverse position analysis is analyzed. At last, the simulations of position and velocity of the manipulator are made to validate the algorithm.

关键词： Design Analysis Parallel Manipulator

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Infrared image detection of belt longitudinal tear based on SVM

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Journal of Computational Information systems 2013年第18期9卷 7469-7475页

作者： Qiao, Tiezhu Zhao, Bilong Shen, Ruiping Zheng, Buxiang State Key Laboratory of Advanced Transducers and Intelligent Control System Taiyuan University of Technology Taiyuan 030024 China Hudi Coal of Jincheng Coal Jincheng 048214 China Xishan Coal and Electricity of Xinjiashe Taiyuan 030200 China

In order to test the fault of belt longitudinal tear efficiently, an infrared image detection method using support vector machine (SVM) is proposed. The infrared images of belt are collected to avoid the adverse effects of the complicated environment of mine. An infrared image segmentation method based on SVM can remedy the defects of the traditional infrared image segmentation algorithm. Computers will test the belt longitudinal tear or predict its tendency by calculating the quantity of torn pixels. The approach has a good practicability. © 2013 Binary Information Press.

关键词： Support vector machines

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A linear interpolation fuzzy controller for a boiler pressure control system

A linear interpolation fuzzy controller for a boiler pressur...

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6th IFAC Symposium on Mechatronic systems, MECH 2013

作者： Bai, Yanhong Zhao, Zhijuan Sun, Zhiyi Quan, Long School of Electronics Information Engineering Taiyuan University of Science and Technology Taiyuan 030024 China Key Laboratory of Advanced Transducers and Intelligent Control system Ministry of Education Taiyuan University of Technology Taiyuan 030024 China

ISBN: (纸本)9783902823311

Considering nonlinear behaviors and environmental disturbance of the boiler pressure control system, a linear interpolation fuzzy controller is developed. First, according to the conventional discrete fuzzy control principle, a discrete fuzzy controller for the system is designed and a 2-D fuzzy control lookup table is deduced. Then, to overcome the conventional fuzzy controller's disadvantage of lower precision caused by discretization, a bilinear interpolation 2-D table lookup method is used to replace the exact lookup method, with which continuous output can be obtained from the discrete control table. Finally, based on the existed computer control system and boiler system hardware configuration, hard-in-loop real-time simulation system is established in Matlab/RTWT. Lots of experiments are carried out. And the results prove that better control performance can be achieved with the proposed control scheme. © 2013 IFAC.

关键词： Table lookup

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Recent progress in the preparation of AuNPs-P DMS composite membranes

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Journal of Measurement Science and Instrumentation 2013年第2期4卷 199-204页

作者：马文哲桑胜波张文栋胡杰李朋伟李刚 MicroNano System Research Center Taiyuan Unive rsity of Technology Key Laboratory of Advanced Transducers and Intelligent Control System Shanxi Province and Ministry of Education

Gold nanoparticles-dimethylsiloxane(AuNPs-PDMS) membrane is a novel composite material in biochemical technology an d micro-electro-mechanical system(MEMS) *** is widely used in biomed ici ne,biochemical detection and en vironmental protection due to its biocompatibility,elasticity and electric char *** this paper,the characteristics of the composite membrane were d escribed,and four methods for fabricating AuNPs-PDMS composite membranes were reviewed in ***,the advantages and disadvantages of the four method s were summarized,and the present problems and future researches were proposed.

关键词： gold nanoparticles （AuNPs） polydimethylsiloxane （PDMS） composite membrane

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