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Bi_(2)S_(3) for Aqueous Zn Ion Battery with Enhanced Cycle Stability

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Nano-Micro Letters 2020年第1期12卷 93-101页

作者： ting Xiong yinming Wang Bosi yin Wen Shi Wee Siang Vincent Lee Junmin Xue Department of Materials Science and Engineering National University of SingaporeSingapore 117573Singapore Centre for Advanced 2D Materials and Graphene Research Centre National University of SingaporeSingapore 117546Singapore MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyNo.92 West‑Da Zhi StreetHarbin 150001People’s Republic of China

Aqueous Zn ion batteries(ZIBs)are promising in energy storage due to the low cost,high safety,and material *** development of metal oxides as the cathode for ZIBs is limited by the strong electrostatic forces between O2−and Zn2+which leads to poor cyclic ***,Bi2S3 is proposed as a promising cathode material for rechargeable aqueous *** cyclic stability and fast diffusion of Zn2+is ***,the layered structure of Bi2S3 with the weak van der Waals interaction between layers offers paths for diffusion and occupancy of Zn2+.As a result,the Zn/Bi2S3 battery delivers high capacity of 161 mAh g−1 at 0.2 A g−1 and good cycling stability up to 100 cycles with ca.100%*** battery also demonstrates good cyclic performance of ca.80.3%over 2000 cycles at 1 A g−*** storage mechanism in the Bi2S3 cathode is related to the reversible Zn ion intercalation/extraction reactions and the capacitive *** work indicates that Bi2S3 shows great potential as the cathode of ZIBs with good performance and stability.

关键词： Aqueous Zn ion battery Bi_(2)S_(3) Good stability

Magnetic gradient:a natural driver of solar eruptions

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Research in Astronomy and Astrophysics 2020年第6期20卷 203-214页

作者： Bao-Lin Tan Yan Yan ting Li yin Zhang Xing-Yao Chen Key Laboratory of Solar Activity National Astronomical Observatories of Chinese Academy of SciencesBeijing 100101China School of Astronomy and Space Science University of Chinese Academy of SciencesBeijing 100049China

It is well-known that a gradient will inevitably drive a *** example,a density-gradient may drive a diffusion flow,an electrical potential-gradient may drive an electric current in plasmas,and so *** flow will be driven when a magnetic-gradient occurs in solar atmospheric plasmas?Considering the ubiquitous distribution of magnetic-gradient in solar plasma loops,this work demonstrates that the magnetic-gradient pumping(MGP)mechanism is valid,even in the partial ionized solar photosphere and chromosphere as well as in the *** magnetic gradient drives energetic particle upflows that carry and convey kinetic energy from the underlying atmosphere to move upwards,accumulate around the looptop and increase the temperature and pressure,produce ballooning instabilities,and finally it leads to magnetic reconnections and eruptions around the *** mechanism may explain the formation of the hot cusp-structures that can be observed above flaring loops in most preflare phases;therefore,the magneticgradient should be a natural driver of solar ***,we may also apply this mechanism to explain many other astrophysical phenomena,such as the cold of sunspot and the hot above it,the formation of solar plasma jets,type-II spicule,and fast solar wind above coronal holes,and also the fast plasma jets related to white dwarfs,neutron stars and black holes.

关键词： Sun eruptions-Sun corona-Sun flare

Characterizing Post-PKS Modifications of 16-Demethyl-rifamycin Revealed Two Dehydrogenases Diverting the Aromatization Mode of Naphthalenic Ring in Ansamycin Biosynthesis

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Chinese Journal of Chemistry 2022年第13期40卷 1553-1558页

作者： ting-Yan Han Kai Zhang Gong-Li Tang Qiang Zhou State Key Laboratory of Bio-organic and Natural Products Chemistry Shanghai Institute of Organic ChemistryChinese Academy of Sciences345 Lingling RoadShanghai 200032China School of Chemistry and Materials Science Hangzhou Institute for Advanced StudyUniversity of Chinese Academy of Sciences1Sublane XiangshanHangzhouZhejiang 310024China

The anti-tuberculous rifamycins belong to naphthalenic ansamycin based on the structure of aromatic ***,we explored the post-polyketide synthase(PkS)modifications in the biosynthesis of 16-demethyl-rifamycins via gene knockout,complementation and in vitro enzyme *** collective evidences showed that i)the aromatization of 8-hydroxyl-7,8-dihydronaphtoquinone was accomplished by the combined action of two dehydrogenases,Rifs and Rif;i)the acetylation and methylation of the macrocycle was carried out on naphthoquinone intermediates in preference to naphthol,by Rif-Orf20 and Rif-Orf14,respectively ii)the presence of Rifs/T homologs in ansamycin biosynthetic gene clusters corresponds to the dehydrogenation aromatization mode of *** findings cast new insights into the naphthalene formation and post-PkS modification of ansamycins.

关键词： Ansamycin Natural products Biosynthesis Dehydrogenation Aromatization

CoB and BN composites enabling integrated adsorption/catalysis to polysulfides for inhibiting shuttle-effect in Li-S batteries

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Journal of Energy Chemistry 2021年第8期30卷 220-228,I0005页

作者： Tianli Wu ting Yang Jizong Zhang Xuewen Zheng Kunlin Liu Chengyang Wang Mingming Chen Key Laboratory for Green Chemical Technology of MOE School of Chemical Engineering and TechnologyTianjin University300072 TianjinChina Collaborative Innovation Center of Chemical Science and Engineering(Tianjin) 300072 TianjinChina

Lithium-sulfur(Li-S)batteries are hampered by the infamous shuttle effect and slow redox kinetics,resulting in rapid capacity ***,a bifunctional catalysis CoB/BN@rGO with integrated structure and synergy effect between adsorption and catalysis is proposed to solve the above *** integrated CoB and BN are simultaneously and uniformly introduced on the rGO substrate through a one-step calcination strategy,applied to modify the cathode side of PP *** transition metal borides can catalyze the conversion of lithium polysulfides(Li_(2)Sn,n≥4),whereas the bond of B-S is too weak to absorb *** BN introduced can effectively restrict the diffusion of polysulfides via strong chemisorption with LiSnLi+…N,while the rGO substrate ensures smooth electron transfer for redox ***,through the integrated adsorption/catalysis,the shuttle effect is suppressed,the kinetics of redox reaction is enhanced,and the capacity decay is *** CoB/BN@rGO modified PP separator,the Li-S batteries with high initial capacity(1450 mAh g^(-1)at 0.35 mA cm^(-2))and long-cycle stability(700 cycles at 1.74 mA cm^(-2)with a decay rate of 0.032%per cycle)are *** work provides a novel insight for the preparation of bifunctional catalysis with integrated structure for long-life Li-S batteries.

关键词： Integrated structure Synergy effect Bifunctional catalysis Separator Li-S batteries

Secure and privacy-preserving DRM scheme using homomorphic encryption in cloud computing

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The Journal of China Universities of Posts and Telecommunications 2013年第6期20卷 88-95页

作者： HUANG Qin-long MA Zhao-feng YANG yi-xian FU Jing-yi NIU Xin-xin Information Security Center Beijing University of Posts and Telecommunications National Engineering Laboratory for Disaster Backup and Recovery Beijing University of Posts and Telecommunications Beijing National Security Science and Technology Co. Ltd

Cloud computing provides a convenient way of content trading and sharing. In this paper, we propose a secure and privacy-preserving digital rights management （DRM） scheme using homomorphic encryption in cloud computing. We present an efficient digital rights management framework in cloud computing, which allows content provider to outsource encrypted contents to centralized content server and allows user to consume contents with the license issued by license server. Further, we provide a secure content key distribution scheme based on additive homomorphic probabilistic public key encryption and proxy re-encryption. The provided scheme prevents malicious employees of license server from issuing the license to unauthorized user. In addition, we achieve privacy preserving by allowing users to stay anonymous towards the key server and service provider. The analysis and comparison results indicate that the proposed scheme has high efficiency and security.

关键词： digital rights management homomorphic encryption proxy re-encryption privacy preserving cloud computing

A Unified Solution for the Free Vibration Analysis of Simply Supported Cylindrical Shells with General Structural Stress Distributions

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Acta Mechanica Solida Sinica 2016年第6期29卷 577-595页

作者： Nian Yang Luyun Chen Hong yi Yong Liu State Key Laboratory of Ocean Engineering Shanghai Jiao Tong University Ship Scientific Research Center of China Shanghai Branch

Most existing studies on the vibration analysis of cylindrical shells with structural stress are limited to uniform stress distribution. However, non-uniform stress distributions are encountered in many engineering applications. In this study, a unified solution for the vibration analysis of cylindrical shells with a general stress distribution is presented using the Fliigge shell theory and modal orthogonality simplification. The obtained analytical solution can be applied to a structure with arbitrary distributed stress, thus it has a wider range of applications than previous methods. The accuracy and advantage of the proposed method are validated by comparing with the finite element method results.

关键词： free vibration cylindrical shells structural stress

Advances of experimental study on gas production from synthetic hydrate reservoir in China

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Chinese Journal of Chemical Engineering 2019年第9期27卷 2213-2225页

作者： Jingchun Feng Longtao Sun yi Wang Xiaosen Li Institute of Environmental&Ecological Engineering Guangdong University of TechnologyGuangzhou 510006China South China Sea Institute of Oceanology Chinese Academy of SciencesGuangzhou 510301China CAS Key Laboratory of Marginal Sea Geology South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China Key Laboratory of Gas Hydrate Guangzhou Institute of Energy ConversionChinese Academy of SciencesGuangzhou 510640China Guangzhou Center for Gas Hydrate Research Chinese Academy of SciencesGuangzhou 510640China Guangdong Key Laboratory of New and Renewable Energy Research and Development Guangzhou 510640China

China has entered the area of new normal economy which requires the harmonious development of energy consumption,environmental protection and economic *** gas hydrate is a potential clean energy with tremendous reserve in *** successful field test of marine hydrate exploitation in South China Sea created a new record of the longest continuous gas production from natural gas ***,the corresponding fundamental research is still urgently needed in order to narrow the gap between field test and commercial *** paper reviewed the latest advances of experimental study on gas production from hydrate reservoir in *** experimental apparatus for investigating the performance of hydrate dissociation in China has developed from one dimensional to two dimensional and three *** addition,well configuration developed from one tube to complicated multi-well networks to satisfy the demand of different production ***,diverse testing methods have been *** reviewed papers preliminary discussed the mechanical properties and the sediment deformation situation during the process of hydrate ***,most reported articles only consider the physical factor,the coupled mechanism of physical and chemical factor for the mechanical properties of the sediment and the sand production problem should be studied further.

关键词： Natural gas hydrate Experimental investigation Gas production Exploitation technology Sediment deformation

Experimental Investigation of Thermal Performance of Novel Finned Radiators for Automotive Cooling System

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Journal of Thermal Science 2024年第5期33卷 1726-1743页

作者： SINGH Hardeep ting David S-K READER Graham ESHTIAGHI Nicky ICHIYANAGI Mitsuhisa SUZUKI Takashi Turbulence&Energy Laboratory University of WindsorWindsor N9B 3P4Canada Chemical and Environmental Engineering School of EngineeringRMIT UniversityMelbourneVictoria 3001Australia Department of Engineering and Applied Sciences Sophia UniversityTokyo 102-8554Japan

This research investigates innovative fin-type radiators for automobile engine cooling ***-channel and helical radiators,along with straight type,were analyzed for heat transfer characteristics under various *** uniqueness of this study is evident in the design of microchannel and helical *** helical radiators,the inner rod features 4/8 helical-shaped water galleries,while the outer tube frame with embedded fins remains *** contrast,the microchannel radiators have compact trapezoidal-shaped water galleries with separate fin ***,the novelty of the research is enhanced by the utilization of 3D printing technology in the manufacturing *** constant fin height analysis at varied water and air flow rate,Microchannel Water Air Radiator with fin height 10.5 mm(MCWAR10.5)depicted a higher heat transfer rate amongst the *** comparison to Straight Water Air Radiator with fin height 9.5 mm(SWAR9.5),the heat transfer rate is 30.3%and 1.3 times ***,in constant fin surface area analysis,microchannel radiator(MCWAR3.2)illustrates lower heat dissipation than Helical radiator(HWAR138)but higher than HWAR134 and Straight radiator(SWAR6).The examination of pumping loss indicated that the Micro-channel radiator outperformed helical radiators due to its lower pressure *** average pressure loss for Micro-channel radiators was 0.74 kPa,making it 1.2 times higher than that of a straight radiator(0.62 kPa),indicating a better trade-off.

关键词： heat exchangers multi-channel helical heat exchanger heat transfer 3D printing

Investigating jet physical properties of Fermi blazars with broad-line emissions

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Science China(Physics,Mechanics & Astronomy) 2023年第10期66卷 138-154页

作者： Lixia Zhang Jianghe Yang yi Liu Junhui Fan Center for Astrophysics Guangzhou UniversityGuangzhou 51006China Astronomy Science and Technology Research Laboratory of Department of Education of Guangdong Province Guangzhou 510006China Key Laboratory for Astronomical Observation and Technology of Guangzhou Guangzhou 510006China Great Bay Center National Astronomical Data CenterGuangzhou 510006China Department of Physics and Electronics Science Hunan University of Arts and ScienceChangde 415000China

Relativistic outflows often exhibit extreme observational characteristics due to beaming effects, which makes measuring their jet power a challenging task. Although the spectral energy distribution(SED) obtained from multi-wavelength data can constrain the physical parameters of these jets, accurately estimating the Doppler factor remains difficult. To address this challenge, we assemble a comprehensive sample containing available SEDs of synchrotron and inverse Compton(IC) components, monochromatic luminosity, and broad-line region(BLR) emissions. We employ a parabolic equation to fit the synchrotron radiation SEDs,constraining jet physical parameters within the framework of a one-zone leptonic model. Our study delves into the jet properties and Doppler factor estimations, yielding the following key findings:(1) The fitting results of SED data for the entire sample reveal normal distributions of jet physical parameters for two subclasses of blazars.(2) Correlation analysis demonstrates that synchrotron peak luminosity exhibits a proportional relationship with both the radio and the γ-ray luminosities.(3) We introduce a novel method for estimating Doppler factors, which uncovers discrepancies between Doppler factors from this work and others from different techniques.

关键词： active galactic nuclei blazars jets spectral energy distribution