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Single-atom catalysis enables long-life, high-energy lithium-sulfur batteries

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Nano Research 2020年第7期13卷 1856-1866页

作者： zechao zhuang Qi kang Dingsheng Wang yadong Li Department of Chemistry Tsinghua UniversityBeijing 100084China Department of Polymer Science and Engineering Shanghai Key Laboratory of Electrical Insulation and Thermal AgeingShanghai Jiao Tong UniversityShanghai 200240China

With high energy density and low material cost,lithium sulfur batteries(LSBs)emerge quite expeditiously as a fascinating energy storage system over the past *** applications of LSBs ranging from electric vehicles to stationary grid storage seem rather bright in recent ***,there still exist many pressing challenges to be addressed because we do not yet fully understand and control the electrode-electrolyte interface chemistries during battery operation,such as polysulide shuttling and poor utilization of active ***-atom catalysts(SACs)pave new possibilities of tackling the tough issues due to their decent applicability in the atomic-level identification of structure-activity relationships and reaction mechanism,as well as their structural tunability with atomic *** review comprehensively summarizes the very recent advances in utilization of highly active SACs for LSBs by stating and discussing the related publications,which involves catalyst synthesis routes,battery pertormance,catalytic mechanisms,optimization strategies,and promises to achieve long-lite,high-energy *** see that endeavors to employ SACs to modify sulfur cathode have allowed efficient polysulfide conversion and confinement,leading to the minimization of shuttle *** efforts are being devoted to extending the scope of SACs to cell separator and lithium metal anode in order to unlock the full potential of *** also obtain mechanistic insights into battery chemistries and nature of SACs in their strong interactions with polysulfides through advanced in situ characterizations ***,acceleration in the development of LSBs by introducing SACs is noticeable,and this cutting edge needs more attentions to further promoting the design of better LSBs.

关键词： single-atom catalysis lithium-sulfur battery polysulfide conversion shuttle effect atomic-level insight

DRIVING FORCE AND DEFORMATION ANALySIS FOR DyNAMIC CRACK PROPAGATION IN GAS PIPELINES UNDER DIFFERENT BOUNDARy CONDITIONS

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Acta Mechanica Solida Sinica 1997年第1期10卷 86-94页

作者： zhuang, z ODonoghue, PE TSING HUA UNIV DEPT ENGN MECHBEIJING 100084PEOPLES R CHINA NATL UNIV IRELAND UNIV COLL DUBLIN DEPT CIVIL ENGNDUBLIN 2IRELAND

In the light of a growing need for fracture control of rapid crack propagation (RCP) in gas pipelines, a program PFRAC(Pipeline FRacture Analysis Code) has been developed((1)) to analyse the various events. In this paper, by using PFRAC for the simulation of axial crack propagation in gas pipelines, a number of dynamic analysis issues relating to boundary effects for uncracked and cracked pipes are investigated. This indicates that the boundary conditions along the length of the pipe play an important role for fracture analysis in the pipe. In contrast, the boundary conditions at the ends of a long pipeline have little effect on the dynamic fracture events.

关键词： fracture mechanics finite element pipe boundary condition

High-dose dexamethasone regulates microglial polarization via the GR/JAK1/STAT3 signaling pathway after traumatic brain injury

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Neural Regeneration Research 2025年第9期20卷 2611-2623页

作者： Mengshi yang Miao Bai yuan zhuang Shenghua Lu Qianqian Ge Hao Li yu Deng Hongbin Wu Xiaojian Xu Fei Niu Xinlong Dong Bin zhang Baiyun Liu Beijing Tiantan Hospital Capital Medical UniversityBeijingChina Department of Neurology The First Hospital of Tsinghua UniversityBeijingChina Department of Neurotrauma and Beijing Key Laboratory of Central Nervous System Injury Beijing Neurosurgical InstituteCapital Medical UniversityBeijingChina Department of Critical Care Medicine Beijing Tiantan HospitalCapital Medical UniversityBeijingChina Center for Nerve Injury and Repair Beijing Institute of Brain DisordersChina National Clinical Research Center for Neurological DiseasesBeijingChina

Although microglial polarization and neuroinflammation are crucial cellular responses after traumatic brain injury,the fundamental regulatory and functional mechanisms remain insufficiently *** potent anti-inflammato ry agents,the use of glucoco rticoids in traumatic brain injury is still controversial,and their regulatory effects on microglial polarization are not yet *** the present study,we sought to determine whether exacerbation of traumatic brain injury caused by high-dose dexamethasone is related to its regulatory effects on microglial polarization and its mechanisms of *** vitro cultured BV2 cells and primary microglia and a controlled cortical impact mouse model were used to investigate the effects of dexamethasone on microglial ***,dexamethasone,RU486(a glucocorticoid receptor antagonist),and ruxolitinib(a Janus kinase 1 antagonist)were ***-sequencing data obtained from a C57BL/6 mouse model of traumatic brain injury were used to identify potential targets of *** Morris water maze,quantitative reverse transcription-polymerase chain reaction,western blotting,immunofluorescence and confocal microscopy analysis,and TUNEL,Nissl,and Golgi staining were performed to investigate our ***-throughput sequencing results showed that arginase 1,a marker of M2 microglia,was significantly downregulated in the dexamethasone group compared with the traumatic brain injury group at3 days post-traumatic brain *** dexamethasone inhibited M1 and M2 microglia,with a more pronounced inhibitory effect on M2microglia in vitro and in *** receptor plays an indispensable role in microglial polarization after dexamethasone treatment following traumatic brain ***,glucocorticoid receptor activation increased the number of apoptotic cells and neuronal death,and also decreased the density of dendritic spines.A possible downstream receptor signaling mechanism is th

关键词： apoptosis BV2 microglia dexamethasone glucocorticoid receptor glucocorticoids innate immune system microglial polarization neuroinflammation primary microglia traumatic brain injury

MICROSTRUCTURE AND MECHANICAL PROPERTIES OF NOVEL 718 SUPERALLOy

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Acta Metallurgica Sinica(English Letters) 2006年第6期19卷 418-424页

作者： J.H.Du X.D.Lü J.L.Qu Q.Deng J.y.zhuang z.y.zhong Department of Superalloy Central Iron and Steel Research InstituteBeijing 100081China

Recently,a novel 718 superalloy with remarkable structural stability at 680℃has been designed and fabricated by CISRI(Central Iron and Steel Research Institute)*** identification of novel 718 alloy under the above-mentioned heat-treatment condition was performed using optical microscopy(OM),scanning electron microscopy(SEM),and transmission electron microscopy(TEM).Results show that the novel 718 alloy has outstanding structural stability at 680℃.The novel 718alloy possess excellent structural stability and good mechanical properties,which is attributed to y-phase strengthening and also to the specific sandwich structure of theγ′+γ'strengthening phase.

关键词： novel 718 superalloy microstructure mechanical property stress rupture creep

Theoretical insights into nitrogen oxide activation on halogen defect-rich{001}facets of bismuth oxyhalide

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Journal of Materials Science & Technology 2021年第18期77卷 217-222页

作者： kang Xu Liang Wang Haifeng Feng zhongfei Xu Jincheng zhuang yi Du Feng Pan Weichang Hao BUAA-UOW Joint Centre School of PhysicsBeihang UniversityHaidian DistrictBeijing100191China Institute for Superconducting and Electronic Materials(ISEM) Australian Institute for Innovative Materials(AIIM)University of WollongongWollongongNSW2525Australia Research Institute for Frontier Science of Beihang University Haidian DistrictBeijing100191China Beijing Computational Science Research Center Beijing100193China

Surface vacancies,serving as the activation centers for surface-adsorbed species,have been widely applied in catalysts to improve their activity and *** the case of ternary compound semiconductors,there is some controversy about exposed atoms and surface ***-dimensional layered BiOCl is an important photocatalyst,which has had numerous studies focused on its oxygen vacancy(O_V)and bismuth vacancy(Bi_V).It has been realized that its(001)surface can consist of exposed halogen atoms rather than oxygen atoms,which thus needs a new explanation for its surface defect engineering *** first-principles calculations,the activation behavior of NO_X(NO_(2),NO,N_(2)O)at a chlorine vacancy(Cl_V)on the BiOCl(001)surface is systematically *** is found that after introducing Cl_V on BiOCl(001)surfaces,NO_X molecules all show excellent activities with longer chemical bonds by capturing electrons from the *** work furnishes fundamental insight into the activation of small molecules on defect-rich surfaces of ternary compound catalysts.

关键词： BiOCl Surface chlorine vacancy NO_X(NO_(2)NON_(2)O)molecules Selective reduction

Exploring the impact of new particle formation events on PM_(2.5) pollution during winter in the yangtze River Delta,China

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Journal of Environmental Sciences 2022年第1期34卷 75-83页

作者： Jinping Ou Qihou Hu Haoran Liu Shiqi Xu zhuang Wang Xiangguang Ji Xinqi Wang zhouqing Xie Hui kang Institute of Physical Science and Information Technology Anhui UniversityHefei 230601China Key Lab of Environmental Optics and Technology Anhui Institute of Optics and Fine MechanicsHefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031China School of Earth and Space Sciences University of Science and Technology of ChinaHefei 230026China School of Environmental Science and Optoelectronic Technology University of Science and Technology of ChinaHefei 230026China Center for Excellence in Regional Atmospheric Environment Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China Institute of Polar Environment&Anhui Province Key Laboratory of Polar Environment and Global Change Department of Environment Science and TechnologyUniversity of Science and Technology of ChinaHefei 230026China

New particle formation(NPF)events are an increasingly interesting topic in air quality and climate *** this study,the particle number size distributions,and the frequency of NPF events over Hefei were investigated from November 2018 to February *** proportions of the nucleation mode,Aitken mode,and accumulation mode were 24.59%,53.10%,and 22.30%,respectively,which indicates the presence of abundant ultrafine particles in ***-six NPF events occurred during the observation days,accounting for 41.82%of the entire observation ***,the favorable meteorological conditions,potential precursor gases,and PM_(2.5)range of the NPF events were *** to non-NPF days,the NPF events preferentially occurred on days with lower relative humidity,higher wind speeds,and higher *** the PM_(2.5) was 15–20,70–80,and105–115μg/m^(3),the frequency of the NPF events was *** mode particles were positively related to atmospheric oxidation indicated by ozone when PM_(2.5) ranged from 15 to 20μg/m^(3),and related to gaseous precursors like SO_(2) and NO_(2) when PM_(2.5)was located at 70-80 and 105–115μg/m^(3).On pollution days,NPF events did not directly contribute to the increase in the PM_(2.5) in the daytime,however,NPF events would occur during the night and the growth of particulate matter contributes to the nighttime PM_(2.5) *** could lead to pollution that lasted into the next *** findings are significant to the improvement of our understanding of the effects of aerosols on air quality.

关键词： New particle formation Aerosols PM_(2.5) Hefei Meteorological conditions

Linear and Nonlinear Optical Properties of Novel Multi-branched Oligomers

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Chinese Journal of Chemical Physics 2012年第6期25卷 636-641,I0003页

作者： Li-jing Gong ying-hui Wang zhi-hui kang Tian-hao Huang Ran Lu Han-zhuang zhang College of Physics Jilin University Changchun 130012 China College of Chemistry Jilin University Changchun 130012 China Aviation University of Air Force Changchun 130022 China

We investigate the fluorene-vinylene unit dependent photo-physical properties of multi- branched truxene based oligomers （Tr-OFVn, n=1-4） employing steady-state absorption and emission spectroscopy, transient absorption spectroscopy, two-photon fluorescence, and z-scan technique. The results show that the increasing of fluorene-vinylene unit leads to a red-shift in the spectra of absorption and fluorescence, and shortens the excited state lifetime. Meanwhile, two-photon fluorescence efficiency and two-photon absorption cross section of truxene based oligolners gradually enhance in company with the extension of π- conjugated length. In addition, the values of two-photon absorption cross section modeled on the sum-over-state approach agree well with the experimental ones. The results indicate multi-branched truxene based oligomers bearing organic materials for two-photon applications.

关键词： Multi-branch oligomer Two-photo absorption z-scan

Tailoring precipitation/properties and related mechanisms for a high-strength aluminum alloy plate via low-temperature retrogression and re-aging processes

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Journal of Materials Science & Technology 2022年第25期120卷 15-35页

作者： L.G.Hou H.yu y.W.Wang L.you z.B.He C.M.Wu D.G.Eskin L.Katgerman L.z.zhuang J.S.zhang State Key Laboratory for Advanced Metals&Materials University of Science&Technology BeijingBeijing 100083China BCAST Brunel University LondonKingston LaneUxbidge Middlesex UB83PHUnited Kingdom Institute of mineral resources Chinese Academy of Geological SciencesBeijing 100037China Nanjing Advanced Transportation Equipment New Technology Research Institute Nanjing 211800China Tomsk State University Tomsk634050Russian Federation Katgerman Aluminium Technology van Beuningenlaan 102334CC LeidenNetherlands Department of Materials Science and Engineering Delft University of TechnologyMekelweg 22628CD Delftthe Netherlands

The retrogression and re-aging(RRA)processes,aimed mainly at tailoring intergranular precipitates,could significantly improve the corrosion resistance(i.e.,stress corrosion cracking resistance)without considerably decreasing the strength,which signifies that an efficient control of the size,distribution and evolution of intergranular and intragranular precipitates becomes critical for the integrated properties of the(mid-)thick high-strength Al alloy *** to RRA process with retrogression at200℃ (T77),this study investigated the impact of a modified RRA process(MT77)with lower retrogression temperatures(155-175℃ )and first-stage under-aging on the properties of a high-strength AA7050 Al alloy,in combination with detailed precipitate *** study showed that the strength/microhardness of the RRA-treated alloys decreased with raising retrogression temperature and/or prolonging retrogression time,along with the increased electrical *** rapid responsiveness of microstructure/property typical of retrogression at 200℃ was obviously postponed or decreased by using MT77 process with longer retrogression time that was more suitable for treating the(mid-)thick *** the other hand,higher retrogression temperature facilitated more intragranularηprecipitates,coarse intergranular precipitates and wide precipitate free zones,which prominently increased the electrical conductivity alongside a considerable strength loss as compared to the MT77-treated *** the preferred MT77 process,the high strength approaching T6 level as well as good corrosion resistance was ***,though a relatively homogeneous through-thickness strength was obtained,some small discrepancies of properties between the central and surface areas of an 86-mm thick 7050 Al alloy plate were observed,possibly related to the quenching *** precipitate evolution and mechanistic connection to the properties were discussed and reviewed for high-strengt

关键词： Aluminum alloy Heat treatment Precipitation Strength Grain boundary

Non-intrusive hybrid interval method for uncertain nonlinear systems using derivative information

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Acta Mechanica Sinica 2016年第1期32卷 170-180页

作者： zhuang-zhuang Liu Tian-ShuWang Jun-Feng Li School of Aerospace Tsinghua University

This paper proposes a new non-intrusive hybrid interval method using derivative information for the dynamic response analysis of nonlinear systems with uncertain-but- bounded parameters and/or initial conditions. This method provides tighter solution ranges compared to the existing polynomial approximation interval methods. Interval arith- metic using the Chebyshev basis and interval arithmetic using the general form modified affine basis for polynomials are developed to obtain tighter bounds for interval computation. To further reduce the overestimation caused by the ＂wrap- ping effect＂ of interval arithmetic, the derivative information of dynamic responses is used to achieve exact solutions when the dynamic responses are monotonic with respect to all the uncertain variables. Finally, two typical numerical examples with nonlinearity are applied to demonstrate the effective- ness of the proposed hybrid interval method, in particular, its ability to effectively control the overestimation for specific timepoints.

关键词： Non-intrusive hybrid interval method Dynamic response analysis Uncertain nonlinear systems Polynomial approximation Interval arithmetic Derivative information