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Preparation of double-shell Si@SnO_(2)@C nanocomposite as anode for lithium-ion batteries by hydrothermal method

Rare Metals 2023年第9期42卷 2972-2981页

作者： Yu Lei Shuai li miao Du Jing Mi Dian-Chao Gao Lei Hao li-Jun Jiang Man Luo Wen-quan Jiang Fan li Shao-Hua Wang National Engineering Research Center of Nonferrous Metals Materials and Products for New EnergyChina GRINM Group Co.Ltd.Beijing100088China GRINM(Guangdong)Institute for Advanced Materials and Technology Foshan528000China Beijing Key Laboratory for Catalysis and Separation Department of Chemical EngineeringBeijing University of TechnologyBeijing100124China

Silicon is one of the most promising anode materials for lithium-ion batteries(liBs), but it suffers from pulverization and hence poor cycling stability due to the large volume variation during lithiation/delithiation. The core-shell structure is considered as an effective strategy to solve the expansion problem of silicon-based anodes. In this paper, the double-shell structured Si@SnO_(2) @C nanocomposite with nano-silicon as the core and SnO_(2) , C as the shells is synthesized by a facile hydrothermal *** characterization shows that Si@SnO_(2) @C nanocomposite is composed of crystalline Si, crystalline SnO_(2) and amorphous C, and the contents of them are 42.1wt%, 37.8 wt% and 20.1 wt%, respectively. Transmission electron microscope(TEM) observations confirm the double-shell structure of Si@SnO_(2) @C nanocomposite, and the thicknesses of the SnO_(2) and C layers are 20 and 7 nm. The Si@SnO_(2) @C electrode exhibits a high initial discharge capacity of 2777 mAh·g^(-1)at 100 mA·g^(-1)and an excellent rate capability of 340 mAh·g^(-1)at 1500 mA·g^(-1). The outstanding capacity retention is 50.2% after 300 cycles over a potential of 0.01 to 2.00 V(vs. li/li+) at 500 mA·g^(-1). The resistance of solid electrolyte interphase(SEI) film(Rf) and charge transfer resistance(Rct) of Si@SnO_(2) @C are 7.68and 0.82 Ω, which are relatively smaller than those of Si@C(21.64 and 2.62 Ω). It is obviously seen that the SnO_(2) shell can reduce the charge transfer resistance, leading to high ion and electron transport efficiency in the Si@SnO_(2) @C electrode. The incorporation of SnO_(2) shell is attributed to the enhanced rate capability and cycling performance of Si@SnO_(2) @C nanocomposite.

关键词： lithium-ion batteries(liBs) Silicon Doubleshell structure Nanocomposite Hydrothermal method

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Kinetic Energy Budgets during the Rapid Intensification of Typhoon Rammasun (2014)

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Advances in Atmospheric Sciences 2023年第1期40卷 78-94页

作者： Xin quan Xiaofan li Key Laboratory of Geoscience Big Data and Deep Resource of Zhejiang Province School of Earth SciencesZhejiang UniversityHangzhouZhejiang 310027China

In this study,Typhoon Rammasun(2014)was simulated using the Weather Research and Forecasting model to examine the kinetic energy during rapid intensification(RI).Budget analyses revealed that in the inner area of the typhoon,the conversion from symmetric divergent kinetic energy associated with the collocation of strong cyclonic circulation and inward flow led to an increase in the symmetric rotational kinetic energy in the lower *** increase in the symmetric rotational kinetic energy in the mid and upper troposphere resulted from the upward transport of symmetric rotational kinetic energy from the lower *** the outer area,both typhoon and Earth’s rotation played equally important roles in the conversion from symmetric divergent kinetic energy to symmetric rotational kinetic energy in the lower *** decrease in the symmetric rotational kinetic energy in the upper troposphere was caused by the conversion to asymmetric rotational kinetic energy through the collocation of symmetric tangential rotational winds and the radial advection of asymmetric tangential rotational winds by radial environmental winds.

关键词： Typhoon Rammasun(2014) rapid intensification kinetic energy budget symmetric and asymmetric winds divergent and rotational circulations environmental flows

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Effects of Phase Composition on Microstructure and Mechanical Properties of Lu_2O_3-doped Porous Silicon Nitride Ceramics

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Journal of Materials Science & Technology 2011年第6期27卷 529-533页

作者： quan li Xiaowei Yin National Key Laboratory of Thermostructure Composite Materials Northwestern Polytechnical University Xi'an 710072 China

Porous silicon nitride ceramics（Si3N4） were fabricated by pressureless sintering using different particle size of silicon nitride ***2O3 was used as sintering *** to phase relationships in the ternary system Si3N4-SiO2-Lu2O3,porous Si3N4 ceramics with different phase composition were designed through the change of the content of SiO2 which was formed by the oxidation at 800℃ in *** Si3N4 with different phase compositions was obtained after sintering at 1800℃ in N2atmosphere.A small content of SiO2 favored the formation of secondary phase Lu4Si2O7N2,while large content of SiO2 favored the formation of secondary phase Lu2Si2O7 and *** Si3N4 ceramics with secondary phase Lu4Si2O7N2 had a flexural strength of 207 MPa,while that with secondary phase Si2N2O and Lu2Si2O7 had lower flexural strength.

关键词： Porous silicon nitride ceramics Secondary phase SiO2

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Bibliometric analysis of UAV swarms

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Journal of Systems Engineering and Electronics 2022年第2期33卷 406-425页

作者： JIANG Yangyang GAO Yan SONG Wenqi li Yue quan quan Beihang University library Beijing 100191China School of Automation Science and Electrical Engineering Beihang UniversityBeijing 100191China

Projects on unmanned aerial vehicle(UAV) swarms have been initiated in a big way in the last few years, especially from 2015 to 2016. As a result, the number of related works on UAV swarms has been on the rise, with the rate of growth dramatically accelerating since 2017. This research conducts a bibliometric analysis of robotics swarms and UAV swarms to answer the following questions:(i) Disciplines mentioned in the UAV swarms research.(ii) The future development trends and hotspots in the UAV swarms research.(iii) Tracking related outcomes in the UAV swarms research.

关键词： unmanned aerial vehicle(UAV)swarm bibliometric mapping knowledge domain

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Removal of trimethoprim and sulfamethoxazole in artificial composite soil treatment systems and diversity of microbial communities

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Frontiers of Environmental Science & Engineering 2019年第2期13卷 147-156页

作者： Qinqin liu miao li Rui liu quan Zhang Di Wu Danni Zhu Xuhui Shen Chuanping Feng Fawang Zhang Xiang liu The Institute of Crustal Dynamics China Earthquake AdministrationBeijing 100085China School of Environment Tsinghua UniversityBeijing 100084China Satellite Environmental Center Ministry of Environmental ProtectionBeijing 100092China Institute of Karst Geology CAGS/Key Laboratory of Karst DynamicsMLR&GZARGuilin 541004China China University of Geosciences (Beijing) Beijing 100083China

Four artificial composite soil treatment systems(ACSTs)fed with reclaimed water containing trimethoprim(TMP)and sulfamethoxazole(SMX)were constructed to investigate SMX and TMP biodegradation efficiency,ammonia and nitrite removal conditions and the microbial community within ACST *** showed SMX and TMP removal rates could reach 80% and 95%,respectively,and removal rates of ammonia and nitrite could reach 80% and 90%,respectively,in *** MiSeq sequencing results showed that microbial community structures of the ACSTs were *** dominant microbial community in the adsorption and biodegradation layers of the ACSTs contained Proteobacteria,Chloroflexi,Acidobacteria,Firmicutes,Actinobacteria and *** and Proteobacteria were considerably dominant in the ACST biodegradation *** entire experimental results indicated that Nitrosomonadaceae_uncultured,Nitrospira and Bacillus were associated with nitrification processes,while Bacillus and Lactococcus were associated with SMX and TMP removal *** findings suggest that ACSTs are appropriate for engineering applications.

关键词： Trimethoprim Sulfamethoxazole Reclaimed water Biodegradation Aerobic nitrification Microbial community

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Preparation and Characterization of Antibacterial Polyacrylonitrile-based Activated Carbon Fiber Supporting Nano-ZnO

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Chemical Research in Chinese Universities 2013年第5期29卷 1011-1015页

作者： li quan-ming College of Quartermaster Science and Technology Jilin University Changchun 130062 P. R. China

Polyacrylonitrile（PAN）-based activated carbon fiber（PACF） supporting nano-ZnO（PACF/nano-ZnO） was prepared by spin, pretreatment, carbonization, and KOH chemical activation at an activation temperature of 950℃ for 40 min. Nano-ZnO content, distribution and antibacterial properties of the PACF/nano-ZnO were studied. The pore structure and surface properties of the PACF/nano-ZnO were studied by Brunauer-Emmett-Teller（BET）, N2/77 K isothermal adsorption. The specific surface area increased markedly after the activation process and it was several hundred times greater than that before the process. The PACF/nano-ZnO shows a strong adsorption for Staphylococ- cus aureus（S, aureus） and Escherichia coli（E, coli） and antibacterial activity against them. As an experimental result, antibacterial properties of PACF/nano-ZnO increased with increasing the concentration of nano-ZnO panicles, which suggests it is a promising antibacterial material.

关键词： Activated carbon fiber Carbon material Antibacterial activity Microstructure

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DeepM6ASeq-EL:prediction of human N6-methyladenosine(m^(6)A)sites with LSTM and ensemble learning

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Frontiers of Computer Science 2022年第2期16卷 27-33页

作者： Juntao CHEN quan ZOU Jing li Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 610051China Hainan Key Laboratory for Computational Science and Application Hainan Normal UniversityHaikou 571158China College of Intelligence and Computing Tianjin UniversityTianjin 300350China

N6-methyladenosine(m^(6)A)is a prevalent methylation modification and plays a vital role in various biological processes,such as metabolism,mRNA processing,synthesis,and *** studies have suggested that m^(6)A modification is related to common diseases such as cancer,tumours,and ***,accurate prediction of methylation sites in RNA sequences has emerged as a critical issue in the area of ***,traditional high-throughput sequencing and wet bench experimental techniques have the disadvantages of high costs,significant time requirements and inaccurate identification of *** through the use of traditional experimental methods,researchers have produced many large databases of m^(6)A *** the support of these basic databases and existing deep learning methods,we developed an m^(6)A site predictor named DeepM6ASeq-EL,which integrates an ensemble of five LSTM and CNN classifiers with the combined strategy of hard *** to the state-of-the-art prediction method WHISTLE(average AUC 0.948 and 0.880),the DeepM6ASeq-EL had a lower accuracy in m^(6)A site prediction(average AUC:0.861 for the full transcript models and 0.809 for the mature messenger RNA models)when tested on six independent datasets.

关键词： N6-methyladenosine site prediction LSTM CNN ensemble learning

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Master Quorum Sensing Regulator HapR Acts as A Repressor of the Mannitol Phosphotransferase System Operon in Vibrio cholerae

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Biomedical and Environmental Sciences 2022年第1期35卷 69-72页

作者： ZHANG Yi quan MA li Zhi GAO Yue QIN Qin li Jie LOU Jing ZHANG miao miao XUE Xing Fan KAN Biao GAO He Department of Clinical Laboratory Nantong Third Hospital Affiliated to Nantong UniversityNantong 212006JiangsuChina Medical Risk Management Section Third Medical CentreChinese PLA(People’s Liberation Army)General HospitalBeijing 100039China First Affiliated Hospital of Dalian Medical University Dalian 116011LiaoningChina State Key Laboratory of Infectious Disease Prevention and Control National Institute for Communicable Disease Control and PreventionChinese Center for Disease Control and PreventionBeijing 102206China School of Medicine Jiangsu UniversityZhenjiang 212013JiangsuChina

The phosphoenolpyruvate(PEP):carbohydrate phosphotransferase system(PTS)is widely used by bacteria to take up sugars or sugar derivatives;.PTS is usually composed of a histidine protein(HPr),enzyme I(EI),and several e... 详细信息

关键词： sugar system usual

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Synthesis of Copper Oxalate Nanorods by a Simple One-step Solid-state Chemical Reaction Method

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Chemical Research in Chinese Universities 2005年第2期21卷 134-136页

作者： CAOYa-li JIADian-zeng liULang XIAODing-quan XINXin-quan InstituteofAppliedChemistry XinjiangUniversityUrumqi830046P.R.China DepartmentofMaterialsScience SichuanUniversityChengdu610064P.R.China StateKeyLaboratoryofCoordinationChemistry NanjingUniversityNanjing210093P.R.China

Copper oxalate nanorods were successfully prepared by means of a simple one-step solid-state reaction method with the assistance of a suitable surfactant, polyethylene glycol 400. The product with uniform rod-like morphology was characterized by XRD, TEM and SEM. The formational mechanism of the rod-like structure was also preliminary discussed.

关键词： Nanorod Nanostructure Solid-state reaction Copper oxalate

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Experimental study on the 3D vibrated packing densification of binary sphere mixtures

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Particuology 2016年第4期14卷 110-114页

作者： Xizhong An Chao li quan Qian ~chool of Materials and Metallurgy Northeastern University Shenyang 110004 China Anshan Iron and Steel Group Corporation Yingkou 115007 China

The packing densification of binary spherical mixtures under 3D mechanical vibration was studied experimentally. The influences of vibration frequency （ω）, volume fraction of large spheres （XL）, sphere size ratio （r, diameter ratio of small to large spheres）, and container size （D） on the random binary packing density （p） were systematically analyzed. For any given set of conditions, there exist optimal ω and XL to realize the densest random binary packing; too large or small ω and XL is not helpful for densification. The influences of both r and D on p are monotonic; either reducing r or increasing D leads to a high value of p. With all other parameters held constant, the densest random packing occurs when XL is dominant, which is in good agreement with the Furnas relation. Moreover, the highest random binary packing density obtained in our work agrees well with corresponding numerical and analytical results in the literature.

关键词： Particle packing Binary spherical mixtures 3D vibration Densification Size ratio

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