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Nitrogen, phosphorus co-doped carbon cloth as self-standing electrode for lithium-iodine batteries

Nano Research 2019年第3期12卷 549-555页

作者： Kang Li song chen Si chen Xien Liu Wei Pan Jintao Zhang Key Laboratory for Colloid and Interface Chemistry Ministry of Education School of Chemistry and Chemical Engineering Shandong University Jinan 250100 China State Key Laboratory Base of Eco-chemical Engineering College of Chemistry and Molecular Engineering Qingdao University of Science & Technology Qingdao 266042 China College of Chemistry Chemical Engineering and Materials Science Shandong Normal University Jinan 250014 China

Rechargeable lithium-iodine (Li-I2) battery is a promising energy storage system because of the high energy and power density. However, the shuttle effects of iodine species and the unstable features of l2 block the practical applications of Li-I2 batteries. Herein, a dual heteroatom doped porous carbon cloth is fabricated as the host material for lithium iodide (Lil). Specifically, the self-standing nitrogen, phosphorus co-doped carb on cloth with high Lil loading exhibits a large specific capacity (221 mAh·g^-1 at 1 C), excelle nt rate capability (95.8% capacity rete ntion at 5 C) and superior I ong cycli ng stability (2,000 cycles with a capacity rete ntion of 96%). Electrochemical kin etic an alysis con firms the domi nant contribution of capacitive effects at high sean rates, which is responsible for the good high-rate performance. The improved electrochemical performance mainly stems from two unique features of nitrogen, phosphorus co-doped porous carbon cloth. Heteroatom doping provides extra active sites for strong adsorption of iodine species while the highly porous structure with large surface area favors the capacitive effects at high rates. This work provides a facile yet efficient approach to regulating both redox reaction and capacitive effects via adjusting surface composition and pore structure of carbon materials for en hanced battery performance.

关键词： iodine heteroatom doping self-standing capacitive effect porous carbon

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A hybrid hydrogel based on clay nanoplatelets and host–guest inclusion complexes

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Chinese Chemical Letters 2016年第4期27卷 583-587页

作者： Xiao-Juan Liao Guo-song chen School of Chemistry and Molecular Engineering East China Normal University Shanghai 200241 China State Key Laboratory of Molecular Engineering of Polymers Fudan University Shanghai 200433 China

In this work,a monomer with double bond was introduced to the surface of clay nanosheets via inclusion complexation between cyclodextrin（CD）host and azobenzene（Azo）guest,as well as electrostatic interaction between clay nanoplatelets and cations of azobenzene *** obtained suprastructure acts as a supramolecular cross-linker in its copolymerization with macromonomer PEG resulting in a hybrid supramolecular *** viscous liquid was obtained in the absence of clay nanoplatelets,revealing the supramolecular cross-linker played an important role in the hydrogel *** hybrid supramolecular hydrogel exhibited good stability and shear thinning property.

关键词： Host–guest chemistry Clay Supramolecular hydrogel Cyclodextrin Electrostatic interaction

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The uncertainty propagation analysis of the projectile-barrel coupling problem

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Defence Technology（防务技术） 2017年第4期13卷 229-233页

作者： Lin-fang Qian Guang-song chen Nanjing University of Science & Technology 200 Xiaolingwei Nanjing Jiangsu 210094 China

Based on the model which couples the projectile and gun barrel during an interior ballistic cycle,the uncertainty propagation analysis of the model is presented caused by the uncertainty of the input *** Bootstrap method is employed to calculate the statistical moments(*** mean,variance,skewness coefficient and kurtosis coefficient)of the parameters of the ***,the maximum entropy method is used to estimate the probability density function(PDF)and the cumulative density function(CDF),the interval of the parameters of the projectile are also ***,the results obtained are compared to the results calculated by Monte Carlo(MC)method to verify the effectiveness of the presented ***,the rule and the uncertainty propagation model of the projectile-barrel coupling system are given with the variation of the uncertainties of the input parameters.

关键词： Uncertainty propagation Projectile-barrel coupling Bootstrap Maximum entropy Interval

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A facile approach to prepare hybrid nanoparticles with morphology controlled by the thickness of glyco-shell

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Chinese Chemical Letters 2015年第7期26卷 847-850页

作者： Wei-Yi Zhang Guo-song chen The State Key Laboratory of Molecular Engineering of Polymers and Department of Macromolecular Science Fudan University

Herein, we designed a novel amphiphilic triblock glycopolymer poly（oligo（ethyleneglycol） methacry- late）-block-poly（maltopyranoside methacrylate）-block-polystyrene （POMA-b-PMal-b-PS） via the com- bination of reversible addition-fragmentation chain transfer （RAFT） polymerization and post- polymerization modification. The micelles with core-shell-corona structures were prepared by direct self-assembly of this glycopolymer in water. We found that these micelles can be used in in situ formation and stabilization of AuNPs. By controlling the thickness of glyco-shell, we successfully obtained lanus particles and raspberry-like particles with AuNPs in the sugar shell.

关键词： Glycopolymer Self-assembly Gold nanoparticles Morphology

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Magnitude of the 23 January 2018 M7.9 Alaska Earthquake Estimated from Local Dense Seismic Records in Alaska

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Journal of Earth Science 2019年第5期30卷 1005-1009页

作者： chen song Qiang Yao Dun Wang Key Laboratory of Earthquake Geodesy Institute of Seismology China Earthquake Administration Wuhan 430071 China State Key Laboratory of Geological Processes and Mineral Resources School of Earth Sciences China University of Geosciences Wuhan 430074 China

We apply a novel method to estimate the magnitude of the 23 January 2018 M7.9 Alaska earthquake using seismic stations recorded at local to regional distances in Alaska, US. We determine the source duration from back-projection results derived from the Alaska stations in a relatively compact azimuth range. Then we calculate the maximum P-wave displacements recorded on a wide azimuth range at distances of 8 to 15 degrees. Combining the source duration and the maximum P-wave displacements, we obtain magnitudes of 7.86–8.03 for the 23 January 2018 earthquake in 3–5 min, very close to the Mw 7.9 determined by the USGS and GCMT. This example validates the new approach for determining magnitude of large earthquakes using local to regional stations, and its time efficiency that magnitudes of large earthquakes can be accurately estimated within in 3–5 min after origin time. Therefore, further application of this new method would help accurate estimation of size of earthquakes that occur offshore and might cause tsunami hazards.

关键词： rapid magnitude estimation back-projection real-time seismology tsunami warning geophysics

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Repulsive Effect for Unbound High Energy Particles Along Rotation Axis in Kerr-Taub-NUT Spacetime

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Communications in Theoretical Physics 2018年第4期69卷 399-406页

作者： Lu Zhang song-Bai chen Department of Physics Hunan Normal University Changsha 410081 China Key Laboratory of Low Dimensional Quantum Structures and Quantum Control of Ministry of Education Hunan Normal University Changsha 410081 China Synergetie Innovation Center for Quantum Effects and Applications Hunan Normal University Changsha 410081 China

We have investigated the acceleration of the unbound high energy particles moving along the rotation axis in the Kerr-Taub-NUT spacetime, and then study the dependence of the repulsive effects on the NUT charge for the particles in the spacetime. Whether the repulsive effects with the NUT charge become stronger depends on the Carter constant, the position and velocity of the particles themselves. We also present numerically the changes of the observable velocity and acceleration with the NUT charge for the unbound particles in the Kerr-Taub-NUT spacetime.

关键词： Kerr-Taub-NUT acceleration black hole

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Multiscale Hybrid-Mixed Finite Element Method for Flow Simulation in Fractured Porous Media

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Computer Modeling in Engineering & Sciences 2019年第4期119卷 145-163页

作者： Philippe Devloo Wenchao Teng chen-song Zhang FEC Universidade Estadual de CampinasBrazil Tracy Energy Technologies BeijingChina NCMIS&LSEC Academy of Mathematics and System SciencesCASBeijingChina

The multiscale hybrid-mixed(MHM)method is applied to the numerical approximation of two-dimensional matrix fluid flow in porous media with *** two-dimensional fluid flow in the reservoir and the one-dimensional flow in the discrete fractures are approximated using mixed finite *** coupling of the two-dimensional matrix flow with the one-dimensional fracture flow is enforced using the pressure of the one-dimensional flow as a Lagrange multiplier to express the conservation of fluid transfer between the fracture flow and the divergence of the one-dimensional fracture flux.A zero-dimensional pressure(point element)is used to express conservation of mass where fractures *** issuing simulation is then reduced using the MHM method leading to accurate results with a very reduced number of global equations.A general system was developed where fracture geometries and conductivities are specified in an input file and meshes are generated using the public domain mesh generator *** test cases illustrate the effectiveness of the proposed approach by comparing the multiscale results with direct simulations.

关键词： Fracture simulation discrete fracture model multiscale hybrid finite element mixed formulation

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High-speed imaging observation on molten bridges of AgNi10 electrical contact material

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Rare Metals 2023年第1期42卷 336-345页

作者： Jing-Hong chen song chen Ming Xie Jie-Qiong Hu Sai-Bei Wang State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metal Kunming Institute of Precious MetalsKunming650106China

The electrical contact-high-speed imaging experimental system was developed to investigate the molten bridge phenomena of AgNi10 electrical contact *** dimension of molten bridges was measured along with the measurement of waveforms in the contact voltage under the load of direct current(DC) 6 V(8-20 A)and breaking speed of 50.0 mm·s^(-1).A part of the observed results was presented as well as surface morphology of the contacts after electrical contact behavior,which shows some interesting and new *** bridges and arc could exist *** stable molten bridge looks like cylindrical shape and then becomes needle tip at its rupture,the diameter and length of molten bridges both increase with the increase in current and the growth gradient of the diameter is larger than that of the *** morphology and elemental distribution of the contact surface are changed by the behavior of electrical contact.

关键词： Molten bridge High-speed imaging Arc AgNi10 electrical contact material

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Tectonic Boundary and Ceasing Time of Amalgamation between the North China Craton and the North Qinling Belt

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Journal of Earth Science 2018年第5期29卷 1074-1080页

作者： Jingbo Liu Neng-song chen Wen Su State Key Laboratory of Lithospheric Evolution Institute of Geology and Geophysics Chinese Academy of Sciences College of Earth and Planetary Sciences University of the Chinese Academy of Sciences School of Earth Sciences Center for Global Tectonics China University of GeosciencesWuhan

The Qinling orogenic belt is a composite orogen, consisting of the north and south Qinling belts with different collision ages. The North Qinling belt is composed of several petro-tectonic units, including the Kuanping, Erlangping, Qinling and Danfeng groups with numerous granitoid plutons from Neoproterzoic to Middle Devonian. To the north of the Kuanping Group, a mylonitized granite body in the Luanchuan Group was determined to have the magmatic age of 850 Ma, which is the northernmost Neoprotozoic granite body. The volcanic rocks of the Dahongkou Formation from the Luanchuan Group had the eruptive age of -1 600 Ma, obtained from zircon U-Pb LA-ICP-MS analysis. The detrital zircons in meta-sandstones from the Taowan Group have three populations of-920-1 400, -1 600-2 100, and 〉2 200 Ma ages, whereas those from the Kuanping Group shows six populations with the peaks of -590, -767, -952, -1 590, -2 485, and -3 200 Ma. These data suggest that the boundary between the North China Craton and the North Qinling belt cannot simply be constrained by using the events determined from zircon U-Pb ages. The granitoid plutons with the magmatic age of 430 Ma were strongly deformed, while those with the magmatic age of -390 Ma show no or less deformation, indicating that the deformation of amalgamation between the North China Craton and the North Qinling belt ceased between 390 and 430 Ma.

关键词： Qinling orogenic belt Taowan Group Kuanping Group granitoid zircon age.

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Fatigue properties of a medium-strength γ-TiAl alloy with different surface conditions

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Rare Metals 2016年第1期35卷 93-99页

作者： Zhen-Jun Yang Hong-Liang Sun Ze-Wen Huang Xiao-song Jiang song chen Key Laboratory of Advanced Technologies of Materials Ministry of EducationSchool of Materials Science and EngineeringSouthwest Jiaotong University

Effects of surface condition on fatigue properties of a medium-strength γ-TiAl alloy Ti-45Al-5Nb-lW（at%） were *** is found that the maximum stresses of fatigue samples are lower than the yield stresses of the medium-strength γ-TiAl ***,the local plastic deformation is unconspicuous to occur at the crack *** this case,the fatigue strength is mainly decided by surface conditions of maximum-stressed surface,but compressive stress and deformation especially resulted from shot peening play an important role in the improvement of the condition fatigue *** affecting depth of shot peening is about 250 μ*** a result,the relatively weak microstructures and phases become the preferential initiation sites and propagation *** are observed to be equiaxed γ grains,B2 ＋ ω grains,and α_2-γ lamellar interface in soft *** existence of V-notch can significantly reduce the fatigue properties of the samples.

关键词： γ-TiAl alloy Fatigue property Surfacecondition Notch sensitivity Microstructure

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