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Carbon Nanostructures: Covalently Connected Carbon Nanostructures for Current Collectors in Both the Cathode and Anode of Li–S Batteries (Adv. Mater. 41/2016)

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Advanced Materials 2016年第41期28卷

作者： Song Jin Sen Xin Linjun Wang Zhenzhen Du Lina Cao Jiafeng Chen Xianghua Kong Ming Gong Junling Lu Yanwu Zhu Hengxing Ji Rodney S. Ruoff Department of Materials Science and Engineering CAS Key Laboratory of Materials for Energy Conversion iChEM (Collaborative Innovation Center of Chemistry for Energy Materials) University of Science and Technology of China Hefei 230026 China School of Chemistry and Chemical Engineering Hefei University of Technology Hefei 230009 China Hefei National Laboratory for Physical Sciences at the Microscale and Center for Micro‐ and Nanoscale Research and Fabrication University of Science and Technology of China Hefei 230026 China Department of Chemical Physics and CAS Key Laboratory of Materials for Energy Conversion University of Science and Technology of China Hefei 230026 China Material Test and Analysis Lab Engineering and Materials Science Experiment Center University of Science and Technology of China Hefei 230026 China Center for Multidimensional Carbon Materials (CMCM) Institute for Basic Science (IBS) Center at the Ulsan National Institute of Science & Technology (UNIST) Campus Department of Chemistry and School of Materials Science UNIST Ulsan 689‐798 South Korea

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Composite data fusion algorithm for miniature vehicles building navigation base in formation flying

Composite data fusion algorithm for miniature vehicles build...

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IEEE Workshop on Signal Processing Systems (SIPS)

作者： Runle Du Jiaqi Liu Zhifeng Li Zhenhong Niu Zhiye Jiang Yadong Yang National Key Laboratory of Science and Technology on Test Physics and Numerical Mathematics Beijing China (100076) China Academy of Launch Vehicle Technology Beijing China (100076)

When multiple miniature vehicles with individual position and inter-vehicle distance measurement ability collaborate in a formation, navigation base can be established by data fusion in a decentralized and standalone scheme. A Composite Data Fusion (CDF) algorithm which combines Least Square Error and Kalman Filtering is proposed in this paper to build navigation base with optimized computing stress. In CDF, Enhanced LSE is incorporated as the preprocessing stage to build a coarse estimation and handle temporary or permanent group number failure. KF stage is then built to further alleviate noises in the pre-processed estimations In CDF, the dynamic model can be much simpler than KF, so the computation load is reduced while the result still has the advantage of high precision. Simulation results show that, when the fault rate of measurement in each vehicle goes 5 thousandth, the result is still acceptable. The computation time of the proposed method is less than three percent of that of KF, while its precision is almost the same to that of KF.

关键词： Vehicles Kalman filters Navigation Mathematical model Equations Data integration

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Development of spectrometer for ultra-high-field human non-proton magnetic resonance imaging system

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Beijing Ligong Daxue Xuebao/Transaction of Beijing Institute of technology 2015年 35卷 39-44页

作者： Zhang, Zhi He, Yu-Gui Wang, Chao Yang, Chun-Sheng Wang, Dong Wang, Lei Chen, Fang Liu, Chao-Yang State Key Laboratory of Magnet Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and Mathematics Chinese Academy of Sciences WuhanHubei430071 China University of Chinese Academy of Sciences Beijing100048 China Wuhan National Laboratory for Optoelectronics School of Optoelectronic Science and Engineering Huazhong University of Science and Technology WuhanHubei430074 China

A digital multi-channel MRI spectrometer based on USB 3.0 bus structure was presented to improve data transmission efficiency and communication reliability. This system is also suitable for multi-channel extension. High-speed external memory chips were used to store pulse sequence binary (PSB) elements and acquisition data. In this way, the execution speed of pulse sequence and transmission efficiency of acquisition data can be greatly improved, thereby implementing the ultra-fast MRI sequences. A preliminary test has been accomplished on a Bruker 4.7 T MRI system, and high quality 1H spin-echo MRI images for a phantom and 23Na MRI images for NaCl solution with different concentrations have been obtained successfully. Results suggest that the design of the control system is feasible and reliable. ©, 2015, Beijing Institute of technology. All right reserved.

关键词： Magnetic resonance imaging

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Fast data fusion algorithm for building navigation base in formation flying

Fast data fusion algorithm for building navigation base in f...

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19th International Conference on Automation and Computing, ICAC 2013

作者： Du, Runle Liu, Jiaqi Jiang, Zhiye Liu, Guojuan National Key Laboratory of Science and Technology on Test Physics and Numerical Mathematics Beijing 100076 China

ISBN: (纸本)9781908549082

When multiple miniature vehicles with inter-vehicle distance measurement ability collaborate in a formation, navigation base can be established without external assisting systems. Shared navigation data is fused to compensate the drift of navigation system and the noise from distance measurement. Existing algorithms like Least Squared Error (LSE) can process nonlinear measurements at high speed, but the noise level of result is high. Kalman Filtering can achieve lower noise level, but it needs huge amount of calculation. The amount of calculation rendered it unsuitable for onboard computing systems. To reduce the computation load of the data fusion algorithm and maintain high precision, Fast Data Fusion (FDF) algorithm which combines LSE and KF is proposed. In this algorithm, LSE is used as the preprocessing stage to build a coarse estimation and KF is then used to further alleviate noises in the pre-processed estimations. In FDF, the dynamic model can be much simpler than KF, so the computation load is reduced while the result still has the advantage of high precision. Simulation results show that, proposed method uses no more than 2.5% of computation time of Kalman Filtering and achieved matching precision. © 2013 Chinese Automation and Computing Society in the UK - CACS.

关键词： Navigation systems

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Laser-sub-cycle two-dimensional electron-momentum mapping using orthogonal two-color fields

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Physical Review A 2014年第6期90卷 061401(R)-061401(R)页

作者： Li Zhang Xinhua Xie Stefan Roither Daniil Kartashov YanLan Wang ChuanLiang Wang Markus Schöffler Dror Shafir Paul B. Corkum Andrius Baltuška Igor Ivanov Anatoli Kheifets XiaoJun Liu André Staudte Markus Kitzler Photonics Institute Vienna University of Technology 1040 Vienna Austria State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and Mathematics Chinese Academy of Sciences Wuhan 430071 China Joint Laboratory for Attosecond Science of the National Research Council and the University of Ottawa 100 Sussex Drive Ottawa Ontario Canada K1A 0R6 Department of Physics of Complex Systems Weizmann Institute of Science Rehovot 76100 Israel Research School of Physical Sciences The Australian University Canberra ACT 0200 Australia

We study laser-sub-cycle control over electron trajectories concomitantly in space and time using orthogonally polarized two-color laser fields. We compare experimental photoelectron spectra of neon recorded by coincidence momentum imaging with photoelectron spectra obtained by semiclassical and numerical solutions of the time-dependent Schrödinger equation. We find that a resolution of a quarter optical cycle in the photoelectron trajectories can be achieved. It is shown that depending on their sub-cycle birth time the trajectories of photoelectrons are affected differently by the ion's Coulomb field.

关键词： ELECTRON optics PARTICLE tracks (Nuclear physics) TIME-dependent Schrodinger equations PHOTOELECTRON spectroscopy COULOMB potential GAUSSIAN distribution

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Ground-state cooling of a trapped ion by quantum interference pathways

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Physical Review A 2014年第4期90卷 043409-043409页

作者： Shuo Zhang Jian-Qi Zhang Qian-Heng Duan Chu Guo Chun-Wang Wu Wei Wu Ping-Xing Chen State Key Laboratory of High Performance Computing National University of Defense Technology Changsha 410073 People's Republic of China College of Science National University of Defense Technology Changsha 410073 People's Republic of China State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and Mathematics Chinese Academy of Sciences and Wuhan National Laboratory for Optoelectronics Wuhan 430071 People's Republic of China

We investigate the possibility of enhancement of cooling a trapped ion by combining the electromagnetically induced transparency (EIT) effect with the standing-wave coupling. Our study shows that the quantum destructive interference which is caused by the EIT effect and the standing-wave coupling can cancel all the dominant heating effects if appropriate parameters are chosen. The analytical predictions and numerical simulations show that the final temperature can be much lower than the recoil energy. In addition, this fast-cooling scheme is robust against fluctuations of the strength of the laser beams, which makes it more feasible for experimental realization.

关键词： QUANTUM interference ION traps GROUND state energy COOLING LASER beams

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An Updated Estimation of Radiative Forcing due to CO_2 and Its Effect on Global Surface Temperature Change

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Advances in Atmospheric sciences 2013年第4期30卷 1017-1024页

作者：张华张若玉石广玉 Laboratory for Climate Studies China Meteorological Administration National Climate Center Atmosphere Science Academy Nanjing University of Information Science and Technology State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmospheric Physics

New estimations of radiative forcing due to CO2 were calculated using updated concentration data of CO2 and a high-resolution radiative transfer model. The stratospheric adjusted radiative forcing （ARF） due to CO2 from the year 1750 to the updated year of 2010 was found to have increased to 1.95 W m-2, which was 17% larger than that of the IPCC＇s 4th Assessment Report because of the rapid increase in CO2 concentrations since 2005. A new formula is proposed to accurately describe the relationship between the ARF of CO2 and its concentration. Furthermore, according to the relationship between the ARF and surface temperature change, possible changes in equilibrium surface temperature were estimated under the scenarios that the concentration of CO2 increases to 1.5, 2, 2.5, 3, 3.5 and 4 times that of the concentration in the year 2008. The result was values of ＋2.2℃, ＋3.8℃, ＋5.1℃, ＋6.2℃, ＋7.1℃ and ＋8.0℃ respectively, based on a middle-level climate sensitivity parameter of 0.8 K （W m 3）-1. Non-equilibrium surface temperature changes over the next 500 years were also calculated under two kinds of emission scenarios （pulsed and sustained emissions） as a comparison, according to the Absolute Global Temperature change Potential （AGTP） of CO2. Results showed that CO2 will likely continue to contribute to global warming if no emission controls are imposed, and the effect on the Earth-atmosphere system will be difficult to restore to its original level.

关键词： CO2 radiative forcing surface temperature change Global Temperature change Potential

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Adaptive multi-resolution 3D Hartree-Fock-Bogoliubov solver for nuclear structure

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Physical Review C 2014年第2期90卷 024317-024317页

作者： J. C. Pei (裴俊琛) G. I. Fann R. J. Harrison W. Nazarewicz Yue Shi (石跃) S. Thornton State Key Laboratory of Nuclear Physics and Technology School of Physics Peking University Beijing 100871 China Department of Physics and Astronomy University of Tennessee Knoxville Tennessee 37996 USA Joint Institute for Nuclear Physics and Applications Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA Computer Science and Mathematics Division Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA Institute for Advanced Computational Science Stony Brook University Stony Brook New York 11794 USA Computational Science Center Brookhaven National Laboratory Upton New York 11973 USA Physics Division Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA Institute of Theoretical Physics Faculty of Physics University of Warsaw ul. Hoża 69 PL-00681 Warsaw Poland

Background: Complex many-body systems, such as triaxial and reflection-asymmetric nuclei, weakly bound halo states, cluster configurations, nuclear fragments produced in heavy-ion fusion reactions, cold Fermi gases, and pasta phases in neutron star crust, are all characterized by large sizes and complex topologies in which many geometrical symmetries characteristic of ground-state configurations are broken. A tool of choice to study such complex forms of matter is an adaptive multi-resolution wavelet analysis. This method has generated much excitement since it provides a common framework linking many diversified methodologies across different fields, including signal processing, data compression, harmonic analysis and operator theory, fractals, and quantum field theory.

关键词： ENERGY-band theory of solids NUCLEAR structure RESEARCH NUCLEAR density numerical analysis -- Software FERMIONS

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A REMAPPING METHOD BASED ON MULTI-POINT FLUX CORNER TRANSPORT UPWIND ADVECTION ALGORITHM

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Journal of Computational mathematics 2013年第6期31卷 592-619页

作者： Zhijun Shen Guixia Lv National Key Laboratory of Science and Technology on Computational Physics Institute of Applied Physics and Computational Mathematics P.O.Box 8009-26 Beijing 100088 China Center for Applied Physics and Technology HEDPS Peking University Beijing 100871 China

A local remapping algorithm for scalar function on quadrilateral meshes is described. The remapper from a distorted grid to a rezoned grid is usually regarded as a conservative interpolation problem. The present paper introduces a pseudo time to transform the interpolation into an initial value problem on a moving grid, and construct a moving mesh method to solve it. The new feature of the algorithm is the introduction of multi- point information on each edge, which leads to the numerical flux consistent with grid node motion. During the procedure of deriving scheme, we illustrate a framework about how the algorithms on a rectangular mesh are easily generated to those on a moving mesh. The basic ideas include：（i） introducing coordinate transformation, which maps the irregular domain in physical space to a perfectly regular computational domain, and （ii） deriving finite volume methods in the physical domain, which can be viewed as a discretization of the transformed equation. The resulting scheme is second-order accurate, conservative and monotonicity preserving. numerical examples are carried out to show the good performance of ore＂ schemes.

关键词： Remapping Advection Multi-point flux Coordinate transformation Geometric conservation law.

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Experimental Demonstration of the Einstein-Podolsky-Rosen Steering Game Based on the All-Versus-Nothing Proof

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Physical Review Letters 2014年第14期113卷 140402-140402页

作者： Kai Sun Jin-Shi Xu Xiang-Jun Ye Yu-Chun Wu Jing-Ling Chen Chuan-Feng Li Guang-Can Guo Key Laboratory of Quantum Information University of Science and Technology of China CAS Hefei 230026 People’s Republic of China Synergetic Innovation Center of Quantum Information and Quantum Physics University of Science and Technology of China Hefei Anhui 230026 People’s Republic of China Theoretical Physics Division Chern Institute of Mathematics Nankai University Tianjin 30071 People’s Republic of China Centre for Quantum Technologies National University of Singapore 3 Science Drive 2 Singapore 117543 Singapore

Einstein-Podolsky-Rosen (EPR) steering, a generalization of the original concept of “steering” proposed by Schrödinger, describes the ability of one system to nonlocally affect another system’s states through local measurements. Some experimental efforts to test EPR steering in terms of inequalities have been made, which usually require many measurement settings. Analogy to the “all-versus-nothing” (AVN) proof of Bell’s theorem without inequalities, testing steerability without inequalities would be more strong and require less resources. Moreover, the practical meaning of steering implies that it should also be possible to store the state information on the side to be steered, a result that has not yet been experimentally demonstrated. Using a recent AVN criterion for two-qubit entangled states, we experimentally implement a practical steering game using quantum memory. Furthermore, we develop a theoretical method to deal with the noise and finite measurement statistics within the AVN framework and apply it to analyze the experimental data. Our results clearly show the facilitation of the AVN criterion for testing steerability and provide a particularly strong perspective for understanding EPR steering.

关键词： EINSTEIN-Podolsky-Rosen paradox QUANTUM mechanics BELL'S theorem FINITE element method INFORMATION asymmetry

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