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Self-Modifying Nanointerface Driving Ultrahigh Bidirectional Thermal Conductivity Boron Nitride-Based Composite Flexible Films

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Nano-Micro Letters 2023年第1期15卷 14-24页

作者： Taoqing Huang Xinyu Zhang Tian Wang Honggang Zhang Yongwei Li Hua Bao Min chen Limin Wu department of Materials Science and State Key Laboratory of Molecular Engineering of Polymers Fudan UniversityShanghai 200433People’s Republic of China department of physics University of Michigan-Shanghai Jiao Tong University Joint InstituteShanghai Jiao Tong UniversityShanghai 200240People’s Republic of China department of Chemistry Fudan UniversityShanghai 200433People’s Republic of China

While boron nitride(BN) is widely recognized as the most promising thermally conductive filler for rapidly developing high-power electronic devices due to its excellent thermal conductivity and dielectric properties,a great challenge is the poor vertical thermal conductivity when embedded in composites owing to the poor interracial interaction causing severe phonon ***,we report a novel surface modification strategy called the "self-modified nanointerface" using BN nanocrystals(BNNCs) to efficiently link the interface between BN and the polymer *** with ice-press assembly method,an only 25 wt% BNembedded composite film can not only possess an in-plane thermal conductivity of 20.3 W m-1K-1but also,more importantly,achieve a through-plane thermal conductivity as high as 21.3 W m-1K-1,which is more than twice the reported maximum due to the ideal phonon spectrum matching between BNNCs and BN fillers,the strong interaction between the self-modified fillers and polymer matrix,as well as ladder-structured BN *** excellent thermal conductivity has been verified by theoretical calculations and the heat dissipation of a *** study provides an innovative design principle to tailor composite interfaces and opens up a new path to develop high-performance composites.

关键词： Thermal management materials Boron nitride Thermal conductivity Interfacial thermal resistance

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Description of rotational properties of the superheavy nucleus ^(256,258,260)Rf by projected shell model

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Chinese Science Bulletin 2014年第29期59卷 3853-3857页

作者： Zhiyi Zhou Yanxin Liu Yingchun Yang Fangqi chen Yang Sun department of physics and Astronomy Shanghai Jiao Tong University School of Science Huzhou Teachers College shanghai jiao tong university Press china Institute of Atomic Energy

Band structure of the Z=104 nucleus256Rf has been a recent research focus in nuclear *** performed projected shell model calculations for this and some other neighboring Rf ***,we studied rotational properties of these nuclei and showed that variations in dynamic moment of inertia were sensitive to single-particle structures,which may be useful information for locating the anticipated island of *** transition properties were also calculated,and measurable quantities were predicted for further experimental test.

关键词：投影壳模型超重核属性旋转转动性能能带结构粒子结构电磁转换

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Dense pair plasma generation and its modulation dynamics in counter-propagating laser field

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Chinese physics B 2018年第10期27卷 433-439页

作者： Wei-Yuan Liu Wen Luo Tao Yuan Ji-Ye Yu Min chen School of Nuclear Science and Technology University of South ChinaHengyang 421001China Key Laboratory for Laser Plasmas（MoE） School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China IFSA Collaborative Innovation Center Shanghai Jiao Tong UniversityShanghai 200240China

With two-dimensional quantum electrodynamics（QED） particle-in-cell simulations, a dense electron-positron（e^-e~＋） pair generation from laser-solid interactions is demonstrated. When the interaction of two linearly polarized laser pulses with a thin target enters into the relativistic transparency regime, a stable standing wave（SW） field can be formed by the overlap of the two counter-propagating laser pulses directly. The present study aims to clarify the effects of the S W field on the dynamics of e^-e^＋ pair plasmas. Our results indicate that under the combined effect of the SW field and radiation reaction（RR） effect, the created e^-e^＋ pairs can be trapped into the electric field nodes when the field strength is *** trapping effect contributes to the generation of γAV≥400 and ultra-dense pair plasmas in the two-side irradiation scheme. Despite different laser intensities, these pair plasmas have a Maxwellian spectral distribution with a peak energy of 150 MeV. Besides, the periodical modulation of the average energy, spatial, phase-space, and angular patterns of the e^-e^＋ pair plasmas can be triggered. In the angular patterns, as long as the SW field exists, pair plasmas can be pinched along the laser polarization direction. These results may offer a better understanding of the laser-solid interactions in the experiments when 10-PW laser facilities come into operation in the future.

关键词： PIC simulation laser-plasma interaction standing wave radiation reaction

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Seasonal variability of mesoscale eddies in the Banda Sea inferred from altimeter data

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Acta Oceanologica Sinica 2020年第12期39卷 11-20页

作者： Baiyang chen Lingling Xie Quanan Zheng Lei Zhou Lei Wang Baoxin Feng Zipeng Yu Laboratory of Coastal Ocean Variation and Disaster Prediction College of Ocean and MeteorologyGuangdong Ocean UniversityZhanjiang 524088China Key Laboratory of Climate Resourcesand Environment in Continental Shelf Sea and Deep OceanGuangdong Ocean UniversityZhanjiang 524088China department of Atmospheric and Oceanic Science University of MarylandCollege ParkMaryland 20742USA School of Oceanography Shanghai Jiao Tong UniversityShanghai 200240China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519000China State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China

Using the mesoscale eddy trajectory atlas product derived from satellite altimeter data from 1993 to 2.16,this study analyzes statistical characteristics and seasonal variability of mesoscale eddies in the Banda Sea of the Indonesian *** results show that there were 147 mesoscale eddies that occurred in the Banda Sea,of which 137 eddies were locally generated and 10 originated from *** total numbers of cyclonic eddies(CEs,clockwise)and anticyclonic eddies(AEs,anticlockwise)are 76 and 71,***,the number of CEs(AEs)is twice larger than the number of AEs(CEs)in winter(summer).In winter,CEs are distributed in the southern and AEs in the northern basins,respectively,but the opposite thing occurs in summer,i.e.,the polarities of mesoscale eddies observed at the same location reverse *** mechanisms of polarity distribution reversal(PDR)of mesoscale eddies are examined with reanalysis data of ocean currents and *** results indicate that the basin-scale vorticity,wind stress curl,and the meridional shear of zonal current reverse seasonally,which are favorable to the PDR of mesoscale *** possible generation mechanisms of mesoscale eddies include direct wind forcing,barotropic and baroclinic instabilities,of which the direct wind forcing should play the dominant role.

关键词： mesoscale eddies polarity distribution reversal(PDR) meridional shear Banda Sea Indonesian seas

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In situ growth of ultra-thin perovskitoid layer to stabilize and passivate MAPbI_(3)for efficient and stable photovoltaics

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eScience 2021年第1期1卷 91-97页

作者： Yanfeng Miao Xingtao Wang Haijuan Zhang Taiyang Zhang Ning Wei Xiaomin Liu Yuetian chen Jie chen Yixin Zhao School of Environmental Science and Engineering Frontiers Science Center for Transformative MoleculesShanghai Jiao Tong UniversityShanghai 200240China Center for Ultrafast Science and Technology Key Laboratory for Laser Plasmas(Ministry of Education)School of Physics and AstronomyCollaborative Innovation Center of IFSA(CICIFSA)Shanghai Jiao Tong UniversityShanghai 200240China

The efficiency and stability of typical three-dimensional(3D)MAPbI_(3)perovskite-based solar cells are highly restricted,due to the weak interaction between methylammonium(MA^(+))and[PbI 6]4-octahedra in the 3D structure,which can cause the ion migration and the related ***,we found that the in situ-grown perovskitoid TEAPbI_(3)layer on 3D MAPbI_(3)can inhibit the MA^(+)migration in a polar solvent,thus enhancing the thermal and moisture stability of perovskite *** crystal structure and orientation of TEAPbI_(3)are reported for the first time by single crystal and synchrotron radiation *** ultra-thin perovskitoid layer can reduce the trap states and accelerate photo-carrier diffusion in perovskite solar cells,as confirmed by ultra-fast *** power conversion efficiency of TEAPbI_(3)-MAPbI_(3)based solar cells increases from 18.87%to 21.79%with enhanced *** work suggests that passivation and stabilization by in situ-grown perovskitoid can be a promising strategy for efficient and stable perovskite solar cells.

关键词： Perovskite solar cell Stability MA migration Perovskitoid Ultra-thin layer

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Magnetic field annihilation and reconnection driven by femtosecond lasers in inhomogeneous plasma

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Science china(physics,Mechanics & Astronomy) 2017年第11期60卷 68-75页

作者： YouYuan Wang FeiYu Li Min chen SuMing Weng QuanMing Lu QuanLi Dong ZhengMing Sheng Jie Zhang Key Laboratory for Laser Plasmas (Ministry of Education) and School of physics and Astronomy Shanghai Jiao Tong University Collaborative Innovation Center of IFSA (CICIFSA) Shanghai Jiao Tong University Scottish Universities physics Alliance (SUPA) Department of PhysicsUniversity of Strathclyde Key Lab of Geospace Environment Chinese Academy of Sciences Department of Geophysics and Planetary Science University of Science and Technology of China School of physics and Optoelectronic Engineering Ludong University

The process of fast magnetic reconnection driven by intense ultra-short laser pulses in underdense plasma is investigated by particle-in-cell simulations. In the wakefield of such laser pulses, quasi-static magnetic fields at a few mega-Gauss are generated due to nonvanishing cross product ▽(n/) × p. Excited in an inhomogeneous plasma of decreasing density, the quasi-static magnetic field structure is shown to drift quickly both in lateral and longitudinal directions. When two parallel-propagating laser pulses with close focal spot separation are used, such field drifts can develop into magnetic reconnection(annihilation) in their overlapping region, resulting in the conversion of magnetic energy to kinetic energy of particles. The reconnection rate is found to be much higher than the value obtained in the Hall magnetic reconnection model. Our work proposes a potential way to study magnetic reconnection-related physics with short-pulse lasers of terawatt peak power only.

关键词： magnetic reconnection laser wakefield magnetic field generation

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Carrier dynamic process in all-inorganic halide perovskites explored by photoluminescence spectra

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Photonics Research 2021年第2期9卷 151-170页

作者： JING chen CHAO ZHANG XIAOLIN LIU LIN PENG JIA LIN XIANFENG chen department of physics Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric PowerShanghai University of Electric PowerShanghai 200090China State Key Laboratory of Advanced Optical Communication Systems and Networks School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China Collaborative Innovation Center of Light Manipulation and Applications Shandong Normal UniversityJinan 250358China

Recently, all-inorganic halide perovskites have received enormous attention because of their excellent optoelectronic properties. Among them, the power conversion efficiency(PCE) of all-inorganic halide perovskite solar cells has made rapid progress in the last few years. However, understanding the intrinsic physical nature of halide perovskites, especially the dynamic process of photo-generated carriers, is a key for improving the PCE. In this review, we introduced and summarized the photoluminescence(PL) technique used to explore the carrier dynamic process in all-inorganic halide perovskites. Several physical models were proposed to investigate the dynamic parameters, i.e., recombination lifetime and diffusion length, by analyzing the steady-state PL as well as the time-resolved PL spectra. We also discussed the distinction of PL spectral behavior between bulk halide perovskite samples and those grown with transport layers due to the participation of different dominant dynamic ***, we briefly described some other optical techniques reported to study the relevant physical properties of all-inorganic halide perovskites.

关键词： properties. perovskite halide

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Numerical investigation on thermal effects by adding thin compartmental plates into cooling enclosures with heat-leaking walls

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Journal of Zhejiang university-Science A(Applied physics & Engineering) 2016年第6期17卷 485-496页

作者： Yong-hua HUANG Qiang chen Institute of Refrigeration and Cryogenics Shanghai Jiao Tong University Shanghai 200240 China

Adding thin compartmental plates near the internal walls of enclosures has been nttmerically modeled using the lattice Boltzmann method. This practice was found to be an effective way to fitrther suppress the disadvantageous effects of heat leak, along with the application of insulation materials on the external surfaces. A modified extrapolation scheme for handling the thermal boundary of the thin plate was proposed and verified by comparison with the conventional coupled boundary scheme. The simulation of the natural convection during the cooling down processes and at steady states in the enclosure indicates that the existence of the plates leads to a higher cooling rate and a more favorable temperature uniformity. For a typical case, the one with plates takes 6% less time to reach the halfway point of the steady state and has 26% less temperature variance. Effects by the plates＇ positions and sizes were parametrically investigated, in order to find an optimal geometrical configuration. In addition, the fluid＇s intrinsic characteristics and the relative heat leak by using the Raylcigh number and Nussclt number, respectively, have been discussed in detail through hydrodynamic and convective heat transfer analyses.

关键词： Plate Enclosure Natural convection Lattice Boltzmann Cooling rate Temperature uniformity

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Optimizing Raman quantum memory with dynamic phase

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Science china(Information Sciences) 2023年第8期66卷 61-71页

作者： Sheng MING Jinxian GUO Yuan WU Guzhi BAO Shuhe WU Minwei SHI Liqing chen Weiping ZHANG School of physics and Astronomy and Tsung-Dao Lee Institute Shanghai Jiao Tong University shanghai Research Center for Quantum Sciences State Key Laboratory of Precision Spectroscopy Quantum Institute of Atom and Light Department of PhysicsEast China Normal University Collaborative Innovation Center of Extreme Optics Shanxi University shanghai Branch Hefei National Laboratory

Optical quantum memory is a key component of emerging quantum technologies and applications. One of the most promising protocols, far-off-resonant Raman memory, is still beset by its *** now, the only effective method for enhancing its efficiency in experiments has been the intensity modulation method on the control field, while the experimental demonstrations still fail to meet the theoretical expectation. In this study, we experimentally demonstrate how to optimize the Raman quantum memory process using a new method called phase modulation; 52.7% total memory efficiency is realized by applying a phase modulation on the control field with a near-square intensity waveform of the control field, thereby resulting in an increase in efficiency of 13.3% compared to the best case of no phase modulation. Additionally, a hybrid method, combining the phase and intensity modulations, is demonstrated with 87.3% memory efficiency. Such high-efficiency results in 99.0% unconditional fidelity even at near single photon level. The unconditional fidelity is always higher than that of the intensity method as the input photon number of the signal increases and can still beat the nonclone limit, even at 128.1 photons/pulse. Our phase modulation method has great potential applications in quantum information processing due to the advantages of low experimental requirements but an additional degree of freedom and high performance, especially for the high speed and high photon number state manipulation.

关键词： quantum information quantum optics quantum communication quantum memory Raman scattering

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Single-pixel imaging with neutrons

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Science Bulletin 2021年第2期66卷 133-138,M0003页

作者： Yu-Hang He Yi-Yi Huang Zhi-Rong Zeng Yi-Fei Li Jun-Hao Tan Li-Ming chen Ling-An Wu Ming-Fei Li Bao-Gang Quan Song-Lin Wang Tian-jiao Liang Institute of physics Chinese Academy of SciencesBeijing 100190China university of Chinese Academy of Sciences Beijing 100049China Institute of High Energy physics Chinese Academy of SciencesBeijing 100049China Spallation Neutron Source Science Center Dongguan 523803China IFSA Collaborative Innovation Center and School of physics and Astronomy Shanghai Jiao Tong UniversityShanghai 200240China College of Engineering physics Shenzhen Technology UniversityShenzhen 518118China Beijing Institute of Aerospace Control Devices Beijing 100039China

Neutron imaging is an invaluable tool for noninvasive analysis in many ***,neutron facilities are expensive and inconvenient to access,while portable sources are not strong enough to form even a static image within an acceptable time frame using traditional neutron *** we demonstrate a new scheme for single-pixel neutron imaging of real objects,with spatial and spectral resolutions of 100 lm and 0.4%at 1A,*** illumination down to 1000 neutron counts per frame pattern was *** experimental setup is simple,inexpensive,and especially suitable for low intensity portable sources,which should greatly benefit applications in biology,material science,and industry.

关键词： Single-pixel neutron imaging Spectral neutron imaging High resolution neutron ghost imaging

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