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arXiv 2019年

作者： Zhang, Xibo Chen, Yang-Yang Liu, Longxiang Deng, Youjin Guan, Xiwen International Center for Quantum Materials School of Physics Peking University Beijing100871 China Collaborative Innovation Center of Quantum Matter Beijing100871 China Beijing Academy of Quantum Information Sciences Beijing100193 China State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics WIPM Innovation Academy for Precision Measurement Science and Technology Chinese Academy of Sciences Wuhan430071 China Shenzhen Institute for Quantum Science and Engineering Department of Physics Southern University of Science and Technology Shenzhen518055 China Shanghai Branch National Research Center for Physical Sciences at Microscale Department of Modern Physics University of Science and Technology of China Shanghai201315 China Chinese Academy of Sciences Center for Excellence: Quantum Information and Quantum Physics University of Science and Technology of China Hefei Anhui230326 China Department of Theoretical Physics Research School of Physics and Engineering Australian National University CanberraACT0200 Australia

Haldane fractional exclusion statistics (FES) has a long history of intense studies, but its realization in physical systems is rare. Here we study repulsively interacting Bose gases at and near a quantum critical point, and find evidences that such strongly correlated gases obey simple non-mutual FES over a wide range of interaction strengths in both one and two dimensions. Based on exact solutions in one dimension, quantum Monte Carlo simulations and experiments in both dimensions, we show that the thermodynamic properties of these interacting gases, including entropy per particle, density and pressure, are essentially equivalent to those of non-interacting particles with FES. Accordingly, we establish a simple interaction-to-FES mapping that reveals the statistical nature of particle-hole symmetry breaking induced by interaction in such quantum many-body systems. Whereas strongly interacting Bose gases reach full fermionization in one dimension, they exhibit incomplete fermionization in two dimensions. Our results open a route to understanding correlated interacting systems via non-interacting particles with FES in arbitrary dimensions. Copyright © 2019, The Authors. All rights reserved.

关键词： Monte Carlo methods

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Learn2Reg: comprehensive multi-task medical image registration challenge, dataset and evaluation in the era of deep learning

arXiv

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arXiv 2021年

作者： Hering, Alessa Hansen, Lasse Mok, Tony C.W. Chung, Albert C.S. Siebert, Hanna Häger, Stephanie Lange, Annkristin Kuckertz, Sven Heldmann, Stefan Shao, Wei Vesal, Sulaiman Rusu, Mirabela Sonn, Geoffrey Estienne, Théo Vakalopoulou, Maria Han, Luyi Huang, Yunzhi Yap, Pew-Thian Brudfors, Mikael Balbastre, Yaël Joutard, Samuel Modat, Marc Lifshitz, Gal Raviv, Dan Lv, Jinxin Li, Qiang Jaouen, Vincent Visvikis, Dimitris Fourcade, Constance Rubeaux, Mathieu Pan, Wentao Xu, Zhe Jian, Bailiang De Benetti, Francesca Wodzinski, Marek Gunnarsson, Niklas Sjölund, Jens Grzech, Daniel Qiu, Huaqi Li, Zeju Thorley, Alexander Duan, Jinming Großbröhmer, Christoph Hoopes, Andrew Reinertsen, Ingerid Xiao, Yiming Landman, Bennett Huo, Yuankai Murphy, Keelin Lessmann, Nikolas van Ginneken, Bram Dalca, Adrian V. Heinrich, Mattias P. Institute of Medical Informatics Universität zu Lübeck Ratzeburger Allee 160 Lübeck23562 Germany Fraunhofer MEVIS Institute for Digital Medicine Lübeck23562 Germany Department of Radiology and Nuclear Medicine Radboud University Medical Center GA Nijmegen6525 Netherlands The Institute of Medical Informatics Universität zu Lübeck Lübeck23562 Germany The Department of Computer Science and Engineering The Hong Kong University of Science and Technology Hong Kong The Fraunhofer MEVIS Institute for Digital Medicine Lübeck23562 Germany The Department of Radiology Stanford University StanfordCA94305 United States The Department of Urology Stanford University StanfordCA94305 United States The Université Paris-Saclay CentraleSupélec Mathématiques et Informatique pour la Complexité et les Systèmes Inria Saclay Gif-sur-Yvette 91190 France Université Paris-Saclay Institut Gustave Roussy Inserm Radiothérapie Moléculaire et Innovation Thérapeutique Villejuif94800 France The Université Paris-Saclay CentraleSupélec Mathématiques et Informatique pour la Complexité et les Systèmes Inria Saclay Gif-sur-Yvette91190 France The Department of Radiology and Nuclear Medicine Radboud University Medical Center Nijmegen6525 GA Netherlands The School of Automation Nanjing University of Information Science and Technology Nanjing210044 China The School of Biomedical Engineering and Imaging Sciences King’s College London London United Kingdom The Athinoula A. Martinos Center for Biomedical Imaging Massachusetts General Hospital United States Harvard Medical School Boston United States The King’s College London United Kingdom The Tel Aviv University The Britton Chance Center for Biomedical Photonics Wuhan National Laboratory for Optoelectronics-Huazhong University of Science and Technology Hubei Wuhan430074 China MoE Key Laboratory for Biomedical Photonics Collaborative Innovation Center for Biomedical Engineering School of Engineering Sciences Huazhong University of Sci

Image registration is a fundamental medical image analysis task, and a wide variety of approaches have been proposed. However, only a few studies have comprehensively compared medical image registration approaches on a wide range of clinically relevant tasks. This limits the development of registration methods, the adoption of research advances into practice, and a fair benchmark across competing approaches. The Learn2Reg challenge addresses these limitations by providing a multi-task medical image registration data set for comprehensive characterisation of deformable registration algorithms. A continuous evaluation will be possible at https://***. Learn2Reg covers a wide range of anatomies (brain, abdomen, and thorax), modalities (ultrasound, CT, MR), availability of annotations, as well as intra- and inter-patient registration evaluation. We established an easily accessible framework for training and validation of 3D registration methods, which enabled the compilation of results of over 65 individual method submissions from more than 20 unique teams. We used a complementary set of metrics, including robustness, accuracy, plausibility, and runtime, enabling unique insight into the current state-of-the-art of medical image registration. This paper describes datasets, tasks, evaluation methods and results of the challenge, as well as results of further analysis of transferability to new datasets, the importance of label supervision, and resulting bias. While no single approach worked best across all tasks, many methodological aspects could be identified that push the performance of medical image registration to new state-of-the-art performance. Furthermore, we demystified the common belief that conventional registration methods have to be much slower than deep-learning-based methods. © 2021, CC BY.

关键词： Image registration

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Application of H-infinity output-feedback control with analysis of weight functions and LMI to nonlinear nuclear reactor cores

Lecture Notes in Mechanical Engineering

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Lecture Notes in Mechanical engineering 2017年 457-468页

作者： Li, Gang Liang, Bin Wang, Xueqian Li, Xiu Xia, Bo National Laboratory for Information Science and Technology Tsinghua University Haidian District Beijing China Graduate School at Shenzhen Tsinghua University University Town Shenzhen China Department of Automation Tsinghua University Haidian District Beijing China Shenzhen Key Lab of Space Robotic Technology and Telescience University Town Shenzhen China Shenzhen Engineering Lab of Precision Geometry Measurement Technology University Town Shenzhen China

This research is to deal with the nonlinear control issue for power regulations of the pressurized water reactor core in nuclear power plants. Based on modeling a nonlinear pressurized water reactor core using the lumped parameter method, its linearized model is achieved through the small perturbation linearization way. The H∞ output-feedback control with analysis of weight functions and linear matrix inequalities solving method is used to contrive a robust controller of the linearized core model. Besides, general laws of selecting weight functions in H∞ control are summarized. The solved H∞ output-feedback controller is applied to the nonlinear core model. The nonlinear core model and the H∞ controller construct the nonlinear core power H∞ control system. Eventually, the nonlinear core power H∞ control system is simulated, and simulation results show that the nonlinear control system is effective. © Springer International Publishing Switzerland 2017.

关键词： Linear matrix inequalities

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Back Cover: Distinguishing structural features between Crohn's disease and gastrointestinal luminal tuberculosis using Mueller matrix derived parameters (J. Biophotonics 12/2019)

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Journal of Biophotonics 2019年第12期12卷

作者： Teng Liu Min Lu Binguo Chen Qinsong Zhong Jingyu Li Honghui He Hua Mao Hui Ma Guangdong Research Center of Polarization Imaging and Measurement Engineering Technology Shenzhen Key Laboratory for Minimal Invasive Medical Technologies Institute of Optical Imaging and Sensing Graduate School at Shenzhen Tsinghua University Shenzhen China Department of Physics Tsinghua University Beijing China Department of Gastroenterology Zhujiang Hospital Southern Medical University Guangzhou China Department of Biomedical Engineering Tsinghua University Beijing China Department of Pathology Zhujiang Hospital Southern Medical University Guangzhou China Center for Precision Medicine and Healthcare Tsinghua-Berkeley Shenzhen Institute Shenzhen China

Currently there is no general gold standard to distinguish between Crohn's disease and gastrointestinal luminal tuberculosis tissues, which both have tuberculosis and surrounding fibrous structures. Here we demonstrate that the Mueller matrix derived polarimetric parameters can reveal the structural features of tuberculosis areas and be used as quantitative indicators to distinguish between Crohn's disease and gastrointestinal luminal tuberculosis tissues, which can be useful for the clinical diagnosis. Further details can be found in the article by Teng Liu, Min Lu, Binguo Chen, et al. ( e201900151 ).

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Distributed consensus control in an autonomous inverter-based microgrid

Distributed consensus control in an autonomous inverter-base...

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2016 IEEE PES Asia Pacific Power and Energy engineering Conference, APPEEC 2016

作者： Zicong, Deng Yinliang, Xu Liu, Houde SYSU-CMU Joint Institute of Engineering School of Electronics and Information Technology Sun Yat-sen University Guangzhou China Graduate School at Shenzhen Tsinghua University Shenzhen Engineering Laboratory of Geometry Measurement Technology China

ISBN: (纸本)9781509054183

An autonomous microgrid must maintain the supply-demand balance at any moment, otherwise it will suffer from frequency deviation and even becomes unstable. This paper proposes a distributed consensus control algorithm for sharing the active power among multiple inverters in an autonomous microgrid. The active power is allocated to local inverters according to their available generation capacities when the microgrid is subjected to load fluctuations. The proposed distributed control algorithm only depends on information exchange among neighboring controllers. Therefore, it can be implemented without introducing an extra central controller and it exploits the sparse communication network efficiently and enhances the adaptivity and reliability. The simulation results with a modified IEEE 9-bus system demonstrate that the system can converge to the desired equilibrium point in cases of load demand fluctuation and power transmission line failure. © 2016 IEEE.

关键词： Controllers

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Pose measurement method of non-cooperative circular feature based on line structured light

Pose measurement method of non-cooperative circular feature ...

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International Conference on Information and Automation (ICIA)

作者： Shunzhi Li Bin Liang Xuehai Gao Xueqian Wang Shenzhen Laboratory of Space Robotics & Telescience Shenzhen China Department of Automation Tsinghua University Beijing China Shenzhen Engineering Laboratory of Geometry Measurement Technology Shenzhen China

ISBN: (纸本)9781509041039

By monocular vision, pose measurement of circular feature exists two possible solutions, and the circle radius is required to be known in advance. To overcome these problems, a line structured light vision system composed by a single camera and a line structured light is established to measure the relative position and attitude of an unknown radius circle. Firstly, two possible solutions of the circular feature are calculated according to the constraint of the circle projection in the image plane. Secondly, two intersection points between the line structured light and circular feature are determined in the image plane by image processing algorithm. The ambiguity can be eliminated by the constraint that the intersection points are on both circular plane and line structured light plane, and then position and attitude of the circular feature can be determined. Finally, the mathematical simulation model is built and the measurement error factors are analyzed. The simulation results show that the measurement method is effective and feasible.

关键词： Cameras Position measurement Space vehicles Mathematical model Coordinate measuring machines Periodic structures Shape

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Stability Analysis of Nonlinear Nuclear Reactor Cores Adopting T-S Fuzzy Modeling and Lyapunov Theory

Stability Analysis of Nonlinear Nuclear Reactor Cores Adopti...

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2016 International Conference on Applied Mathematics, Simulation and Modelling(AMSM2016)

作者： Gang Li Bin Liang Xueqian Wang Xiu Li Kang Wang Tsinghua University National Laboratory for Information Science and Technology Tsinghua University Graduate School at Shenzhen Tsinghua University Department of Automation Shenzhen Key Lab of Space Robotic Technology and Telescience Shenzhen Engineering Lab of Precision Geometry Measurement Technology

ISBN: (纸本)9781510833890

This research is to solve the stability analysis issue of nonlinear pressurized water reactor cores. On the basis of modeling a nonlinear pressurized water reactor core using the lumped parameter method, its linearized model is achieved via the small perturbation linearization way. Linearized models of the nonlinear core at six power levels are selected as local models of this core. The T-S fuzzy idea for the core is exploited to construct the T-S fuzzy model of the nonlinear core based on the local models and the triangle membership function, which approximates the nonlinear core model within the entire range of power level. This fuzzy model as a bridge is to cater to the stability analysis of the nonlinear core after defining its stability. One stability theorem is deduced to define the nonlinear core is globally asymptotically stable in the global range of power level. Finally, the simulation work and stability analyses are separately completed. Numerical simulations show that the fuzzy model can substitute the nonlinear core model;stability analyses verify the nonlinear core is globally asymptotically stable in the global range of power level.

关键词： reactor core T-S modeling Lyapunov theory stability analysis

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Phonon transport in silicon nanowires: The reduced group velocity and surface-roughness scattering

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Physical Review B 2016年第11期94卷 115420-115420页

作者： Liyan Zhu Baowen Li Wu Li School of Physics and Electronic and Electrical Engineering and Jiangsu Key Construction Laboratory of Modern Measurement Technology and Intelligent System Huaiyin Normal University Huai'an Jiangsu 223300 China Department of Mechanical Engineering University of Colorado Boulder Colorado 80309 USA Institute for Advanced Study Shenzhen University Nanhai Avenue 3688 Shenzhen 518060 China

Using a linear-scaling Kubo simulation approach, we have quantitatively investigated the effects of confinement and surface roughness on phonon transport in silicon nanowires (SiNWs) as thick as 55 nm in diameter R. The confinement effect leads to significant reduction of phonon group velocity v in SiNWs compared to bulk silicon except at extremely low phonon frequencies f, which very likely persists in SiNWs several hundreds of nanometers thick, suggesting the inapplicability of bulk properties, including anharmonic phonon scattering, to SiNWs. For instance, the velocity can be reduced by more than 30% for phonons with f>4.5 THz in 55-nm-thick nanowires. In rough SiNWs Casimir's limit, which is valid in confined macroscopic systems, can underestimate the surface scattering by more than one order of magnitude. For a roughness profile with Lorentzian correlation characterized by root-mean-square roughness σ and correlation length Lr, the frequency-dependent phonon diffusivity D follows power-law dependences D∝Rασ−βLrγ, where α∼2 and β∼1. On average, γ increases from 0 to 0.5 as R/σ increases. The mean free path and the phonon lifetime essentially follow the same power-law dependences. These dependences are in striking contrast to Casimir's limit, i.e., D∼vR/3, and manifest the dominant role of the change in the number of atoms due to roughness. The thermal conductivity κ can vary by one order of magnitude with varying σ and Lr in SiNWs, and increasing σ and shortening Lr can efficiently lower κ below Casimir's limit by one order of magnitude. Our work provides different insights to understand the ultralow thermal conductivity of SiNWs reported experimentally and guidance to manipulate κ via surface roughness engineering.

关键词： Lattice thermal conductivity Nanowires

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Dynamic Coupling of Space Robots with Flexible Appendages

Dynamic Coupling of Space Robots with Flexible Appendages

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IEEE International Conference on Robotics and Biomimetics

作者： Deshan Meng Bin Liang Wenfu Xu Bo Zhang Houde Liu School of Mechanical Engineering and Automation Harbin Institute of Technology Shenzhen Graduate School Shenzhen P.R. China School of Astronautics Harbin Institute of Technology Harbin P.R. China Shenzhen Key Lab of Space Robotic Technology and Telescience Shenzhen Engineering Lab of Precision Geometry Measurement Technology Tsinghua University Shenzhen Graduate School Shenzhen P.R. China

ISBN: (纸本)9781467396769

For a space robot with flexible appendages, the structure flexibilities will easily cause vibration during orbit and/or attitude maneuver of the base, and the operation of the manipulators. Hence, the pose (position and attitude) of the end-effector will deviate from the desired values largely. In this paper, we derive the rigid-flexible coupling dynamics of a space robot system with flexible appendages and establish the coupling model between the flexible structure and the space manipulator. Then, some coupling factors are defined to measure the coupling degree between the flexible motion of the appendages and the rigid motion of the end-effector. Moreover, a new type of coupling map is proposed and drawn in joint space to represent the coupling motion between the joint and the appendages. The coupling map is very important for trajectory planning to reduce appendage vibration. The above work supplies a theoretic basis to guide the system design, performance evaluation, trajectory planning and motion control of such space robots.

关键词： deviate desired appendages

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Enhancing the signal intensity with stimulated emission optical process

Enhancing the signal intensity with stimulated emission opti...

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The 4th Advances in Optoelectronics and Micro/nano-optics (AOM 2014)(第四届光电子与微纳光学进展国际会议)

作者： Xuehua Wang Danni Chen Bin YU Hanben Niu Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Optoelectronic EngineeringShen-zhen UniversityShenzhen 518060China State Key Laboratory of Precision Measurement Technology and Instruments Tsinghua UniversityBeijing 100084China Shenzhen Key Laboratory of Biomedicine Engineering Shenzhen UniversityShenzhen 518060China Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong ProvinceCollege of Optoelectronic EngineeringShen-zhen UniversityShenzhen 518060China Shenzhen Key Laboratory of Biomedicine Engineering Shenzhen UniversityShenzhen 518060China

In super-resolution fluorescence microscopy,the collected photon rate from fluorescence probes determines not only the minimum detectableconcentration of molecules but also its temporal-spatial *** we propose a new approach to enhance signal intensity (collected photons/s) byintroducing stimulated emission (SE) to an excited fluorophore before its energy dissipates into other spontaneous emission or nonradiative decay pro-cesses.

关键词： stimulated emission transfer efficiency spatial coherence

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