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Two-dimensional SnS2 nanosheets on Prussian blue template for high performance sodium ion batteries

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Frontiers of Chemical Science and Engineering 2019年第3期13卷 493-500页

作者： Glenn J. Sim Kakui Ma Zhixiang Huang Shaozhuan Huang Ye Wang Huiying Yang Pillar of Engineering Product development Singapore University of Technology and DesignSingapore 487372Singapor Airbus group Innovations Singapore Singapore 797562Singapore Key Laboratory of Materials Physics of Ministry of Education Department of Physics and EngineeringZhengzhou UniversityZhengzhou 450052China

Three-dimensional Prussian blue (PB) nanostructures was obtained via a one-step hydrothermal method. Subsequently, two-dimensional tin disulfide (SnS2) nanosheets were grown onto PB through a facile hydrothermal synthesis. The as prepared SnS2/PB is further employed as the anode of sodium ion batteries (SIBs). S11S2/PB nanoarchitecture delivers a specific capacity of 725.7 mAh·g-1 at 50 mA·g-1. When put through more than 200 cycles, it achieved a stable cycling capacity of 400 m Ah·g^-1 at 200 m A·g^i. The stable Na^+ storage properties of SnS2/PB was attributed to the synergistic effect among the conductive PB carbon, used as the template in this work. These results obtained potentially paves the way for the development of excellent electrochemical performance with stable performance of SIBs.

关键词： Prussian blue carbon nanocubes tin disulfide sodium ion batteries

Planarization mechanism of alkaline copper CMP slurry based on chemical mechanical kinetics

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Journal of Semiconductors 2013年第8期34卷 197-200页

作者：王胜利尹康达李湘岳红维刘云岭 Institute of Microelectronics Hebei University of Technology No.46 Research Institute of China Electronics technology group Corporation

The planarization mechanism of alkaline copper slurry is studied in the chemical mechanical polishing （CMP） process from the perspective of chemical mechanical *** from the international dominant acidic copper slurry,the copper slurry used in this research adopted the way of alkaline technology based on complexation. According to the passivation property of copper in alkaline conditions,the protection of copper film at the concave position on a copper pattern wafer surface can be achieved without the corrosion inhibitors such as benzotriazole（BTA）,by which the problems caused by BTA can be *** the experiments and theories research,the chemical mechanical kinetics theory of copper removal in alkaline CMP conditions was proposed. Based on the chemical mechanical kinetics theory,the planarization mechanism of alkaline copper slurry was established. In alkaline CMP conditions,the complexation reaction between chelating agent and copper ions needs to break through the reaction *** kinetic energy at the concave position should be lower than the complexation reaction barrier,which is the key to achieve planarization.

关键词： chemical mechanical kinetics alkaline copper slurry planarization mechanism complexation reaction barrier

Fischer-Tropsch Synthesis over Modified Cobalt Catalysts

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过程工程学报 2006年第4期6卷 656-660页

作者：李增喜聂志勤王蕾张香平张锁江 Graduate University of Chinese Academy of Sciences group for Green Chemistry and technology Institute of Process Engineering Chinese Academy of Sciences Beijing 100080 China School of Science and technology Tsinghua University group for Green Chemistry and technology Institute of Process Engineering Chinese Academy of Sciences

The catalysts of Co/Zr-SiO2 were prepared by precipitation and the promoter of Pt was supported by *** reducibility of the cobalt oxide and the other physicochemical properties of the catalysts were characterized by TPR,TPD,BET and *** the evaluation of the reduction temperature,the reduction degree increased but the surface area of the catalysts and the adsorption property for reactant CO distinctly decreased;The addition of Pt resulted in the improvement of the reducibility by decreasing the reduction temperature of cobalt oxide *** FT-synthesis has been performed in a quartz fixed-bed reactor,and the experimental results showed that the best activity for promoted catalyst has been found at the reduction temperature of 400℃,in spite of its uncompleted reduction.

关键词： FT synthesis cobalt reduction XPS

Towards Cost-Effective Cloud Downloading with Tencent Big Data

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Journal of Computer Science & technology 2015年第6期30卷 1163-1174页

作者：李振华刘刚嵇智源 Roger Zimmermann School of Software Tsinghua University Beijing 100084 China Tsinghua National Laboratory for Information Science and technology Beijing 100084 China QQXuanfeng System group Tencent Co. Ltd Shanghai 200233 China High technology Research and development Center Ministry of Science and Technology Beijing 10004 China Department of Computer Science National University of Singapore Singapore 117417 Singapore

The cloud downloading scheme, first proposed by us in 2011, has effectively optimized hundreds of millions of users＇ downloading experiences. Also, people start to build a variety of useful Internet services on top of cloud downloading. In brief, by using cloud facilities to download （and cache） the requested file from the ＂best-effort＂ Internet on behalf of the user, cloud downloading ensures the data availability and remarkably enhances the data delivery speed. Although this scheme seems simple and straightforward, designing a real-world cloud downloading system involves complicated and subtle trade-offs （between deployment cost and user experience） when serving a large number of users： 1） how to plan the cloud cache capacity to achieve a high and affordable cache hit ratio, 2） how to accelerate the data delivery from the cloud to numerous users, 3） how to handle the dense user requests for highly popular files, and 4） how to judge a potential downloading failure of the cloud. This paper addresses these design trade-offs from a practical perspective, based on big data from a nationwide commercial cloud downloading system, i.e., Tencent QQXuanfeng. Its running traces help us find reasonable design strategies and parameters, and its real performances confirm the efficacy of our design. Our study provides solid experiences and valuable heuristics for the developers of similar and relevant systems.

关键词： cloud downloading cost-effective design trade-off big data

Organic manure input and straw cover improved the community structure of nitrogen cycle function microorganism driven by water erosion

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International Soil and Water Conservation Research 2022年第1期10卷 129-142页

作者： Yulong Shi Qingwen Zhang Xingren Liu Xuekai Jing Chang Shi Li Zheng Agricultural Clean Watershed Resewarch group Institute of Environment and Sustainable Development in AgricultureChinese Academy of Agricultural SciencesBeijing100081China

Water erosion process induces differences to the nitrogen(N)functional microbial community structure,which is the driving force to key N processes at soil-water ***,how the soil N trans-formations associated with water erosion is affected by microorganisms,and how the microbial respond,are still *** objective of this study is to investigate the changes of microbial diversity and community structure of the N-cycle function microorganisms as affected by water erosion under application of organic manure and straw *** the basis of iso-nitrogen substitution,four treatments were set up:1)only chemical fertilizer with N 150 kg ha^(-1),P2O560 kg ha^(-1) and K2O 90 kg ha^(-1)(CK);the N was substituted 20%by 2)organic manure(OM);3)straw(SW);and 4)organic manure+straw(1:1)(OMSW).The results showed that applying organic manure and straw to sloping farmland can increase soil N contents,but reduce runoff depth,Kw,sediment yield and N loss,especially in the *** cover and straw+organic manure increased the diversity(Chao1)of nitrifier(AOB),and both diversity and uniformity(Shannon)of denitrifier(nirK/S)were increased in the *** erosion control mea-sures reduced N-fixing bacteria diversity and increased their uniformity,and the combined application of organic manure and straw cover was a better erosion control measure than the single application of *** soil chemistry and erodibility were the main drives for the changes of N-functional microbial community structure and the appearance of dominant bacteria with different organic materials.

关键词： Water erosion Soil erodibility Organic amendment Nitrifier Denitrifier N-fixing bacteria

Removal of VOCs from Sudden Polluted Raw Water by Air Stripping

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Journal of Donghua University(English Edition) 2011年第5期28卷 456-459页

作者：林明利殷晓桃崔福义赵志伟姜琦 State Key Laboratory of Urban Water Resource and Environment School of Municipal and Environmental EngineeringHarbin Institute of Technology Pan-China Construction group Environmental development Center of Ministry Environmental Protection

Volatile organic compounds （VOCs） are widely used in various industrial processes and generate water pollutions. VOCs removal from raw water is an important task for waterworks to guarantee drinking water security. The removal of VOCs such as chlorobenzene （CB） and ethylbenzene （EB） from raw water by air stripping was investigated under various conditions, inciuding the variation of temperature （5-30~C）, pH （3.5-10.5）, and air/water ratio （10-60）. The air stripping removal efficiency of VOCs decreased with VOCs concentration declining in water. And Henry＇s law constant was demonstrated as an indicator of the estimation of VOCs removal efficiency for air stripping. The effects of temperature and the ratio of air and water were found to play a great role in VOCs removal, but the effect of pH seemed to be negligible. This study demonstrates that air stripping provides a promising opportunity in removing VOCs in drinking water treatment, especially for the relatively high concentration of VOCs.

关键词： volatile organic compounds (VOCs) air stripping emergency water treatment Henry's law constant (H) removal

Reconstruction of solid oxide fuel cell electrode microstructure and analysis of its effective conductivity

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Science Bulletin 2016年第1期61卷 78-85页

作者： Keqing Zheng Meng Ni Building Energy Research group Department of Building and Real Estate The Hong Kong Polytechnic University Environmental Energy Research group Research Institute for Sustainable Urban Development (RISUD) The Hong Kong Polytechnic University

The effective conductivity （aeff） of solid oxide fuel cell （SOFC） electrode is an important parameter for predicting the ohmic loss in SOFC. This paper investigates the effective conductivity of SOFC electrodes recon- structed numerically by packing spherical particles in a computational domain, followed by a dilation process to simulate the sintering procedure. The effects of various parameters on the effective conductivity of the electrodes are investigated, including material composition, porosity, particle size and contact angle. Results show that the effective conductivity ratio （aeff/ao） of the computed con- ducting phase is mainly affected by its total volume frac- tion （VF） in electrode （including the porosity）. The effective conductivity can be improved by increasing the VF, electrode particle size or the contact angle between electrode particles. Based on the numerical results, the conventional percolation model for the calculation of O＇eft is improved by adjusting the Bruggeman factor from 1.5 to 2.7. The results are useful for understanding the microstructure properties of SOFC composite electrode and for subsequent electrode optimization.

关键词： Fuel cell Electrode Conductivity Modeling Random particle packing

A review of welding simulation methods for large components

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Progress in Natural Science:Materials International 2023年第5期33卷 551-568页

作者： Shuai Liu Zhiqiang Wu Wenhao Zhou Honggang Zhou Keke Zhang Danqing Yin Yongping Lei Yongfeng Qiu Engineering Research Center of Mining development technology and Equipment for Deep Sea and Earth Ministry of Education Hunan University of Science and Technology Hunan Valin Xiangtan Iron & Steel group Co. Ltd Research Institute of technology Jianglu Electromechanical Science & Technology Co. Ltd.Xiangtan School of Materials Science and Engineering Henan University of Science and Technology School of Materials Science and Engineering Beijing University of Technology Guiyang Aluminum Magnesium Design & Research Institute Co. Ltd

The challenges posed by cross-scale effects, large computational requirements, high nonlinearity, and complex interactions of multiple physical phenomena constitute major obstacles to the effectiveness and accuracy of welding simulations for large structural components. Therefore, achieving accurate welding simulation to predict and effectively control welding deformation of substantial engineering structural parts is essential to ensure welding quality and improve production efficiency. This paper reviews the current research status of welding numerical simulation of large engineering components, including the establishment of the finite element model,optimization of the heat source model, selection of appropriate finite element calculation method, and the control of welding deformation through optimization algorithm. In addition, the strategies to improve the precision and efficiency of welding numerical simulation and control welding deformation of engineering components are analyzed and discussed. The future development of welding numerical simulation will focus on balancing simulation accuracy and simulation efficiency and optimizing welding parameters to control welding deformation efficiently.

关键词： Large welded components Algorithm optimization Welding deformation Simulation accuracy and efficiency

ROCK inhibition as a novel potential strategy for axonal regeneration in optic neuropathies

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Neural Regeneration Research 2015年第12期10卷 1949-1950页

作者： Inge Van Hove Evy Lefevere Lieve Moons Neural Circuit development and Regeneration Research group Department of BiologyKU Leuven Laboratory of Ophthalmology Department of NeurosciencesKU Leuven

Optic neuropathies or optic nerve diseases are a frequent cause of permanent vision loss that can occur after inflammation,ischemia,infection,tumors,trauma and/or an elevated pressure inside the eye（also called intra... 详细信息

关键词： ROCK inhibition as a novel potential strategy for axonal regeneration in optic neuropathies RGCs