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Enhanced thermoelectric performance enabled by compositing ZrO_(2)in n-type SiGe alloy with low thermal conductivity

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Rare Metals 2024年第3期43卷 1167-1176页

作者： Meng-Fei Wang Hua-jun Lai Ji-Sheng liang jun-liang chen Wang-Yang Ding Qi Zhou Ying Peng cheng-Yan Liu Lei Miao Guangxi Key Laboratory for Relativity Astrophysics State Key Laboratory of Featured Metal Materials and Life-Cycle Safety for Composite StructuresSchool of Physical Science and TechnologyGuangxi UniversityNanning530004China Guangxi Academy of Sciences Nanning530007China Key Laboratory of Information Material Engineering Research Center of Electronic Information Materials and DevicesGuilin University of Electronic TechnologyMinistry of EducationGuilin541004China Guangxi Key Laboratory of Precision Navigation Technology and Application School of Information and CommunicationGuilin University of Electronic TechnologyGuilin541004China

SiGe-based thermoelectric(TE)materials have gained increasing interests due to their low maintenance costs,environmental friendliness and long ***,the intrinsically high thermal conductivity of Si-based materials also results in poor TE *** this investigation,a zirconia(ZrO_(2))composite strategy was applied to an n-type SiGe alloy,tremendously elevating its TE *** mechanical alloying and spark plasma sintering(SPS)processes,the ZrO_(2)induced the formation of nanopores in the SiGe matrix via phosphorus ***,such increase in porosity enhanced the phonon scattering and dramatically suppressed lattice thermal conductivity,from 2.83 to 1.59 W·m^(-1)·K^(-1)at 873 ***,reduced phosphorus doping led to an increase in Seebeck coefficients and a relatively minor decrease in electrical conductivity,The power factor didn't deteriorate significantly,either,as its maximum of~3.43 mW·m^(-1-)K^(-2)was achieved at 873 K with(Si_(0.8)Ge_(0.2))_(0.097)P_(0.03)(ZrO_(2))_(0.003).In short,a peak figure of merit(ZT)of~1.27 at 873 K and an average ZT~0.7 from 323 to 873 K were *** study demonstrates that the electrical and thermal transportation of SiGe material can be synergistically tuned by compositing ZrO_(2),illustrating a novel strategy to optimize the TE properties of bulk materials.

关键词： Thermoelectric SiGe alloy ZrO2 composting P element adsorption nanopores

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GRB 210610B:The Internal and External Plateau as Evidence for the Delayed Outflow of Magnetar

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Research in Astronomy and Astrophysics 2024年第7期24卷 170-180页

作者： Yi-Ning Wei Xiang-Gao Wang Da-Bin Lin Wei-Kang Zheng liang-jun chen Sheng-Yu Yan Shuang-Xi Yi Qi Wang Zi-Min Zhou Hui-Ya Liu En-Wei liang Guangxi Key Laboratory for Relativistic Astrophysics School of Physical Science and TechnologyGuangxi UniversityNanning 530004China GXU-NAOC Center for Astrophysics and Space Sciences Nanning 530004China Department of Astronomy University of CaliforniaBerkeleyCA 94720-3411USA Department of Physics and Tsinghua Center for Astrophysics(THCA) Tsinghua UniversityBeijing 100084China School of Physics and Physical Engineering Qufu Normal UniversityQufu 273165China

After launching a jet,outflows of magnetar were used to account for the achromatic plateau of afterglow and the early X-ray flux plateau known as“internal plateau”.The lack of detecting magnetic dipole emission together with the energy injection feature in a single observation poses confusion until the long gamma-ray burst(GRB)210610B is *** 210610B is presented with an optical bump following an early X-ray plateau during the afterglow *** plateau followed by a steep decline flux overlays in the steadily decaying X-ray flux with indexα_(X,1)~2.06,indicating an internal origin and that can be fitted by the spin-down luminosity law with the initial plateau luminosity log_(10)L_(X)~48.29 erg s~(-1)and the characteristic spin-down timescale T~2818 s.A subsequent bump begins at~4000 s in the R band with a rising indexα_(R,1)~-0.30 and peaks at~14125 s,after which a decay indexα_(R,2)~0.87 and finally transiting to a steep decay withα_(R,3)~1.77 achieve the closure relation of the external shock for the normal decay phase as well as the magnetar spin-down energy injection phase,provided that the average value of the photon indexΓ_γ=1.80 derived from the spectral energy distributions(SEDs)between the X-ray and optical *** closure relation also works for the late X-ray *** to the traditional picture of GRB,the outflow powers the early X-ray plateau by dissipating energy internally and collides with the leading decelerating blast burst as time goes on,which could interpret the exotic feature of GRB *** carry out a Markov Chain Monte Carlo simulation and obtain a set of best parameters:■.The artificial light curve can fit the afterglow data *** that,we estimated the average Lorentz factor and the X-ray radiation efficiency of the later ejecta are 35%and 0.13%,respectively.

关键词： (stars)gamma-ray burst individual(GRB 210610B)-(stars)gamma-ray burst general-stars jets

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GRB 200612A:An Ultralong Gamma-Ray Burst Powered by Magnetar Spinning Down

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Research in Astronomy and Astrophysics 2024年第2期24卷 190-195页

作者：陈良军王祥高杨德龙梁恩维 Guangxi Key Laboratory for Relativistic Astrophysics School of Physical Science and TechnologyGuangxi UniversityNanning 530004China

GRB 200612A could be classified as an ultralong gamma-ray burst due to its prompt emission lasting up to~1020 s and the true timescale of the central engine activity t_(burst)≥4×10^(4) *** late X-ray light curve with a decay index ofα=7.53 is steeper than the steepest possible decay from an external shock *** propose that this X-ray afterglow can be driven by dipolar radiation from the magnetar spindown during its early stage,while the magnetar collapsed into the black hole before its spindown,resulting in a very steep decay of the late X-ray light *** optical data show that the light curve is still rising after 1.1 ks,suggesting a late *** show that GRB 200612A’s optical afterglow light curve is fitted with the forward shock model by Gaussian structured off-axis *** is a special case among GRBs,as it may be an ultralong gamma-ray burst powered by a magnetar in an off-axis observation scenario.

关键词： (stars:)gamma-ray burst individual(GRB 200612A)-(stars:)gamma-ray burst general-stars magnetars

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Velocity Distance of the Open Cluster M11

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Chinese Journal of Astronomy and Astrophysics 2007年第4期7卷 572-578页

作者： jun-liang Zhao Li chen Shanghai Astronomical Observatory Chinese Academy of Sciences Shanghai 200030

On the reasonable hypothesis that the internal motions of member stars of a cluster are random and isotropic, a method which can be used to estimate the velocity distance of the cluster and its uncertainty is developed. The velocity distance so determined is an absolute distance estimate, and is completely independent of the （widely used） luminosity distance, which is a relative distance estimate. Using the published high-accuracy observational data of radial velocities and proper motions of the stars in the open cluster M11 region, we have determined the distance of M 11 to be 1.89 ± 0.52 kpc. This is in quite good agreement with the published luminosity distances of the cluster. We briefly discuss the problems concerned, including the sources of errors in the method and its applicable range.

关键词： open cluster-radial velocity-proper motion -luminosity distance-velocity distance

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Kinematics of the Open Cluster System in the Galaxy

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Chinese Journal of Astronomy and Astrophysics 2006年第3期6卷 287-296页

作者： jun-liang Zhao Li chen Zhong-liang Zu Shanghai Astronomical Observatory Chinese Academy of Sciences Shanghai 200030

Absolute proper motions and radial velocities of 202 open clusters in the solar neighborhood, which can be used as tracers of the Galactic disk, are used to investigate the kinematics of the Galaxy in the solar vicinity, including the mean heliocentric velocity components （u1, u2, u3） of the open cluster system, the characteristic velocity dispersions （σ1,σ2,σ3）, Oort constants （A, B） and the large-scale radial motion parameters （C, D） of the Galaxy. The results derived from the observational data of proper motions and radial velocities of a subgroup of 117 thin disk young open clusters by means of a maximum likelihood algorithm are：（u1,u2,u3） = （-16.1 ± 1.0,-7.9 ±1.4,-10.4±1.5） km·s^-1, （σ1,σ2,σ3） = （17.0±0.7, 12.2±0.9, 8.0±1.3） km·S^-1, （A, B） = （14.8±1.0, - 13.0±2.7） km·s^-1 kpc^-1, and （C, D） = （1.5 ± 0.7, -1.2 ±1.5） km·s^-1 kpc^-1. A discussion on the results and comparisons with what was obtained by other authors is given.

关键词： Galaxy: kinematics and dynamics - open clusters and associations: general

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Studies of the radiation environment on the Mars surface using the Geant4 toolkit

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Nuclear Science and Techniques 2022年第1期33卷 120-130页

作者： jun-liang chen Su-jun Yun Tie-Kuang Dong Zhong-Zhou Ren Xiao-Ping Zhang Key Laboratory of Modern Acoustics and Department of Physics Nanjing UniversityNanjing 210093China School of Electronic Engineering Nanjing XiaoZhuang UniversityHongjing RoadNanjing 211171China Key Laboratory of Dark Matter and Space Astronomy Purple Mountain ObservatoryCAS2 West Beijing RoodNanjing 210008China School of Physics Science and Engineering Tongji UniversitySiping Rood 1239Shanghai 200092China State Key Laboratory of Lunar and Planetary Sciences Macao University of Science and TechnologyMacao 999078China

The radiation environment on the surface of Mars is a potential threat for future manned exploration missions to this *** this study,a simple geometrical model was built for simulating the radiation environment on the Mars surface caused by galactic cosmic rays;the model was built and studied using the Geant4 *** simulation results were compared with the data reported by a radiation assessment detector(RAD).The simulated spectra of neutrons,photons,protons,α particles,and particle groups Z=3-5,Z=6-8,Z=9-13,and Z=14-24 were in a reasonable agreement with the RAD ***,for deuterons,tritons,and 3He,the simulations yielded much smaller values than for the corresponding RAD *** addition,the particles’spectra within the 90 zenith angle were also *** on these spectra,we calculated the radiation dose that would have been received by an average human body on *** distribution of the dose throughout the human body was not *** absorbed and equivalent doses for the brain were the highest among all of the organs,reaching 62.0±1.7 mGy/y and 234.1±8.0 mSv/y,*** average absorbed and equivalent doses for the entire body were approximately 44 mGy/y and 153 mSv/y,*** analysis revealed that most of the radiation dose was owing to a particles,protons,and heavy *** then studied the shielding effect of the Mars soil with respect to the *** body dose decreased significantly with increasing soil *** the depth of 1.5 m,the effective dose for the entire body was 17.9±2.4 mSv/y,lower than the dose limit for occupational *** the depth of 3 m,the effective dose to the body was 2.7±1.0 mSv/y,still higher than the accepted dose limit.

关键词： Galactic cosmic rays Radiation environment of the Mars Absorbed dose Equivalent dose Geant4

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Ice-templated preparation and sodium storage of ultrasmall SnO2 nanoparticles embedded in three- dimensional graphene

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Nano Research 2015年第1期8卷 184-192页

作者： Longkai Pei Qi Jin Zhiqiang Zhu Qing Zhao Jing liang jun chen Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education) Collaborative Innovation Center of Chemical Scienceand Engineering College of Chemistry Nankai University Tianjin 300071 China

We report on the ice-templated preparation and sodium storage of ultrasmall SnO2 nanoparticles （3--4 nm） embedded in three-dimensional （3D） graphene （SnO2@3DG）. SnO2@3DG was fabricated by hydrothermal assembly with ice-templated 3DG and a tin source. The structure and morphology analyses showed that 3DG has an interconnected porous architecture with a large pore volume of 0.578 cm^3·g^-1 and a high surface area of 470.5 m^2·g^-1. In comparison, SnO2@3DG exhibited a pore volume of 0.321 cmg.g^-1 and a surface area of 237.7 m^2·g^-1 with a homogeneous distribution of ultrasmall SnO2 nanoparticles in a 3DG network. SnO2@3DG showed a discharge capacity of 1,155 mA-h·g^-1 in the initial cycle, a reversible capacity of 432 mA·h·g^-1 after 200 cycles at 100 mA·g^-1 （with capacity retention of 85.7% relative to that in the second cycle）, and a discharge capacity of 210 mAh·g^-1 at a high rate of 800 mA·g^-1 This is due to the high distribution of SnO2 nanoparticles in the 3DG network and the enhanced facilitation of electron/ion transport in the electrode.

关键词： graphene three-dimensional ice-template metal oxide sodium-ion battery

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Realizing high thermoelectric performance for p-type SiGe in medium temperature region via TaC compositing

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Journal of Materiomics 2023年第5期9卷 984-991页

作者： Zheng Fan JiSheng liang jun-liang chen Ying Peng Huajun Lai Jian Nong chengyan Liu Wangyang Ding Lei Miao Guangxi Key Laboratory for Relativity Astrophysics State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite StructuresSchool of Physical Science and TechnologyGuangxi UniversityNanning530004China Engineering Research Center of Electronic Information Materials and Devices Ministry of EducationGuangxi Key Laboratory of Information MaterialGuilin University of Electronic TechnologyGuilin541004China Guangxi Key Laboratory of Precision Navigation Technology and Application Guilin University of Electronic TechnologyGuilin541004China Guangxi Academy of Sciences Nanning530007China

SiGe is recognised as an excellent thermoelectric material with superior mechanical properties and thermal stability in regions with high *** study explores a novel strategy for coregulating thermoelectric transport parameters to achieve high thermoelectric properties of p-type SiGe in the mid-temperature region by incorporating nano-TaC into SiGe combined ball milling with spark plasma *** optimizing the amount of TaC in the SiGe matrix,the power factors were significantly increased due to the modulation doping effect based on the work function matching of SiGe with ***,the ensemble effect of the nanostructure leads to a significant decrease in thermal ***,a high ZT of 1.06 was accomplished at 873 K,which is 64%higher than that of typical radioisotope thermoelectric *** research offers a novel strategy for expanding and enhancing the thermoelectric properties of SiGe materials in the medium temperature range.

关键词： SiGe Thermoelectric Work function matching Modulation doping effect Phonon scattering

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Hydrogel-supported poly(L-lactic acid) and polystyrene microsphere-based three-dimensional culture systems for in vitro cell expansion

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Frontiers of Materials Science 2024年第2期18卷 129-137页

作者： Huaying Hao Lihong Sun Jiaxuan chen jun liang State Key Laboratory of Food Nutrition and Safety Tianjin University of Science&TechnologyTianjin 300457China College of Light Industry Science and Engineering Tianjin University of Science&TechnologyTianjin 300457China College of Food Science and Engineering Tianjin University of Science&TechnologyTianjin 300457China

The in vitro expansion of stem cells is important for their application in different life science fields such as cellular tissue and organ *** objective of this paper was to achieve static cell culture in vitro through peptide hydrogel-supported microspheres(MSs).The peptides,with their gel-forming properties,microstructures,and mechanical strengths characterized,were found to have good support for the MSs and to be *** internal structures of poly(L-lactic acid)microspheres(PLLA-MSs)and polystyrene microspheres(PS-MSs)made in thelaboratory were observed and statistically analyzed in terms of particle size and pore size,following which the co-cultured MSs with cells were found to have good cell *** addition,three-dimensional(3D)culturing of cells was performed on the peptide and microcarrier composite scaffolds to measure cell viability and cell *** results showed that the peptides could be stimulated by the culture medium to self-assembly form a 3D fiber network *** the peptide-Ms composite scaffold-based cell culture system,further enhancement of the cell culture effect was *** peptide-Ms composite scaffolds have great potential for the application in 3D cell culture and in vitro cellexpansion.

关键词： microcarrier microsphere peptide hydrogel cell scaffold three-dimensional culture cell expansion

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Biliverdin Protects the Isolated Rat Lungs from Ischemia-reperfusion Injury via Antioxidative, Anti-inflammatory and Anti-apoptotic Effects

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Chinese Medical Journal 2017年第7期130卷 859-865页

作者： Wen-Fang Tian Ping Weng Qiong Sheng jun-liang chen Peng Zhang Ji-Ru Zhang Bin Du Min-chen Wu Qing-Feng Pang Jian-jun Chu Department of Pathophysiology Wuxi Medical School Jiangnan University Wuxi Jiangsu 214122 China Department of Anesthesia Affiliated Hospital of Jiangnan University Wuxi Jiangsu 214122 China

Background：Biliverdin （BV） has a protective role against ischemia-reperfusion injury （IRI）.However,the protective role and potential mechanisms of BV on lung IRI （LIRI） remain to be ***,we aimed to investigate the protective role and potential mechanisms of BV on ***：Lungs were isolated from Sprague-Dawley rats to establish an ex vivo LIRI *** an initial 15 min stabilization period,the isolated lungs were subjected to ischemia for 60 min,followed by 90 min ofreperfusion with or without BV ***：Lungs in the I/R group exhibited significant decrease in tidal volume （1.44 ± 0.23 ml/min in I/R group vs.2.41 ± 0.31 ml/min in sham group;P 〈 0.001）,lung compliance （0.27 ± 0.06 ml/cmH2O in I/R group vs.0.44 ± 0.09 ml/cmH2O in sham group;P 〈 0.001;1 cmH2O=0.098 kPa）,and oxygen partial pressure （PaO2） levels （64.12 ± 12 mmHg in FR group vs.114 ± 8.0 mmHg in sham group;P 〈 0.001;1 mmHg =0.133 kPa）.In contrast,these parameters in the BV group （2.27 ± 0.37 ml/min of tidal volume,0.41 ± 0.10 ml/ cmH2O of compliance,and 98.7 ± 9.7 mmHg of PaO2） were significantly higher compared with the I/R group （P =0.004,P 〈 0.001,and P 〈 0.001,respectively）.Compared to the I/R group,the contents of superoxide dismutase were significantly higher （47.07 ± 7.91 U/mg protein vs.33.84 ± 10.15 U/mg protein;P =0.005） while the wet/dry weight ratio （P 〈 0.01）,methane dicarboxylic aldehyde （1.92 ± 0.25 nmol/mg protein vs.2.67 ± 0.46 nmol/mg protein;P 〈 0.001）,and adenosine triphosphate contents （297.05 ± 47.45 nmol/mg protein vs.208.09 ± 29.11 nmol/mg protein;P =0.005） were markedly lower in BV-treated *** analysis revealed that BV alleviated ***,the expression of inflammatory cytokines （interleukin-1 β,interleukin-6,and tumor necrosis factor-α） was downregulated and the expression of cyclooxygenase-2,inducible nitric oxide synthase,and jun N-terminal kinase was significantly reduced in BV group （all P 〈 0.01 compared to I/R group）.Fi

关键词： Apoptosis Biliverdin Ischemia-reperfusion Injury Lung Pro-inflammatory Cytokines

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