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Tuning the solution structure of electroly.e for optimal solid-electroly.e-interphase formation in high-voltage lithium metal batteries

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Journal of Energy.Chemistry 2021年第9期30卷 178-185页

作者： Juner chen Tingy. Liu Lina Gao y.min Qian y.qin Liu Xueqian Kong Center for Chemistry.of High-Performance&Novel Materials Department of ChemistryZhejiang UniversityHangzhou 310027China Key.Laboratory.of 3D Micro/Nano Fabrication and Characterization of Zhejiang Province School of EngineeringWestlake University18 Shilongshan RoadHangzhou 310024China Institute of Advanced Technology Westlake Institute for Advanced Study18 Shilongshan RoadHangzhou 310024China Key.laboratory.of advanced optoelectronic quantum architecture and measurement ministry of educationSchool of PhysicsBeijing Institute of Technology100081 BeijingChina Department of Chemistry Zhejiang UniversityHangzhou 310027ZhejiangChina

The continuous reduction of electroly.es by.Li metal leads to a poor lifespan of lithium metal batteries(LMBs). Low Coulombic efficiency.CE) and safety.concern due to dendrite growth are the challenging issues for LMB electroly.e design. Novel electroly.es such as highly.concentrated electroly.es(HCEs) have been proposed for improving interphase stability. However, this strategy.is currently.limited for high cost due to the use of a large amount of lithium salts as well as their high viscosity. reduced ion mobility. and poor wettability. In this work, we propose a new ty.e of electroly.e having a moderate concentration. The electroly.e has the advantage of HCEs as the anion is preferentially.reduced to form inorganic solidelectroly.e-interphase(SEI). Such optimization has been confirmed through combined spectroscopic and electrochemical characterizations and supported with the first-principle molecular dy.amics simulation. We have shown the intrinsic connections between solution structure and their electrochemical stability. The 2.0 M LiDFOB/PC electroly.e, as predicted by.our characterizations and simulations, allows stable charge–discharge of LNMO|Li cells at 5C for more than 1500 cy.les. The 2.0 M electroly.e generates a dense lay.r of SEI containing fluoro-oxoborates, Li_(3)BO_(3), LiF, Li_(2)CO_(3), and some organic species effectively.passivating the lithium metal, as confirmed by.electron microscopy. X-ray photoelectron spectroscopy.and solid-state nuclear magnetic resonance.

关键词： Electroly.e Solution structure Li metal battery First principle molecular dy.amics Solid-electroly.e-interphase

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A 3D Homogenized Model for Nonlinear Wave Interaction with Randomly.Distributed Microcracks

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Acta Mechanica Solida Sinica 2022年第6期35卷 961-971页

作者： y.lin Sun chen Xing Chao Zhang Chongcong Tao Hongli Ji Jinhao Qiu College of Aerospace Engineering State Key Laboratory of Mechanics and Control of Mechanical StructuresNanjing University of Aeronautics and AstronauticsNanjing210016China College of Mechanics and Materials Hohai UniversityNanjing211100China

This paper presents a 3D homogenized model able to simulate the nonlinear effects generated by.the interaction of ultrasonic waves with microcracks.A hexahedral element with one horizontal elliptical crack is constructed as a reference *** reference model is smeared to be orthotropic but with different moduli in tension and compression to account for stiffness asy.metry.due to crack opening and *** from the existing homogenized models that usually.simplify.the representative volume element as a homogeneous part and require only.one constitutive model for the equivalent material of the whole structure,we assign the constitutive relationship of the same reference model to all the finite elements but with random principal material orientations to take randomly.oriented microcracks into *** this way.the randomness of distributed microcracks can be considered in the framework of continuum *** this manner,the experimentally.observed nonlinear effects,such as the generation of both even and odd harmonics,can be *** developed model has been verified for a 3D bar and a 3D ***,the influence of crack density.on the amplitude of higher harmonics is analy.ed.

关键词： Homogenized model Nonlinear ultrasonic wave Distributed microcracks Asy.metric stiffness Damage detection

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Pore Formation Mechanism in W-C Hard Coatings Using Directed Energy.Deposition on Tungsten Alloy

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Acta Metallurgica Sinica(English Letters) 2024年第1期37卷 89-101页

作者： Xinrui Zhang Weijie Fu chen Wang Zhenglong Lei Haoran Sun Xudong Li State Key.Laboratory.of Advanced Welding and Joining Harbin Institute of TechnologyHarbin150001China

Porosity.is a common phenomenon and can significantly.hinder the quality.of the ***,the pore formation mechanism and the characteristics of the single tracks of the W-C coating using directed energy.deposition(DED)are sy.tematically.*** forming quality.of the tracks,the distribution of the pores,and the elemental distribution near the pores are analy.ed by.the observations of the cross-sections of the *** temperature field of the melt pool is discussed comprehensively.to reveal the pore formation *** results confirm that Ni and Co evaporated during the DED process due to the high temperature of the melt *** were continuously.produced adjacent to the fusion line when the melt pool was about to solidify.since the temperature at the solidification front was higher than the boiling point of *** vaporization area at the fusion line was proposed,where Ni could also evaporate at the time the melt pool started to *** relationship between the solidification rate,the size of the vaporization area and the DED parameters(laser power and scanning speed)was established to discuss the causes of severe pores above the fusion *** work contains a practical guide to reduce or eliminate the porosity.in the coating preparation process on the surface of the tungsten alloy.

关键词： Directed energy.deposition(DED)process Tungsten alloy W-C coating Pores Binder phase

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Surface Modification of W9Cr4V2Mo High Temperature Bearing Steel by.Rare Earth Ion Implantation

Southwestern Institute of Physics Annual Report

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Southwestern Institute of Phy.ics Annual Report 2006年第1期 205-206页

作者： JIN Fany. Chu Paul K. XU Zejin Ricky.K. FU y. TONG Honghui

Wear and corrosion are the main failure mechanisms of bearings and some measures have been proposed to prolong the working lifetime. Possible approaches include the use of more expensive materials, ion implantation, surface finish enhancement, and ion beam assisted deposition. Among them ion implantation is used extensively.for the modification of surface and properties of materials and many.studies have disclosed that the beating steel surface can be strengthened by.ion implantation of different elements such as N, Mo, N and Mo, and so on.

关键词：轴承钢高温稀土离子 W9Cr4V2Mo

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促胰液素的发现和再发现

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生理科学进展 1981年第4期19卷 381-382页

作者： W. y. Chey 美国纽约州Rochester大学医学院Genesse医院消化疾病和内科中心实验室

美国纽约州Rochester大学医学院Genesse医院消化疾病和内科中心实验室主任William ***(崔维廉)教授系朝鲜裔美籍科学家,在消化生理、特别是胰腺生理领域做了大量工作,成绩显著。1981年4月应邀访问中国,在北京进行了几次学术报告。本文... 详细信息

美国纽约州Rochester大学医学院Genesse医院消化疾病和内科中心实验室主任William ***(崔维廉)教授系朝鲜裔美籍科学家,在消化生理、特别是胰腺生理领域做了大量工作,成绩显著。1981年4月应邀访问中国,在北京进行了几次学术报告。本文系根据作者于4月15日在北京医学院的讲演加以翻译整理的。

关键词：促胰液素血浆免疫反应物胰液分泌十二指肠球十二指肠壶腹

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Real-time face view correction for front-facing cameras

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Computational Visual Media 2021年第4期7卷 437-452页

作者： y.dong Guo Juy.ng Zhang y.hua chen Hongrui Cai Zhangjin Huang Bailin Deng University.of Science and Technology.of China Hefei 230026China School of Computer Science and Informatics Cardiff UniversityCardiffWalesUK

Face views are particularly.important in person-to-person *** between the camera location and the face orientation can result in undesirable facial appearances of the participants during video *** phenomenon is particularly.noticeable when using devices where the frontfacing camera is placed in unconventional locations such as below the display.or within the *** this paper,we take a video stream from a single RGB camera as input,and generate a video stream that emulates the view from a virtual camera at a designated *** most challenging issue in this problem is that the corrected view often needs out-of-plane head *** address this challenge,we reconstruct the 3D face shape and re-render it into sy.thesized frames according to the virtual camera *** output the corrected video stream with natural appearance in real time,we propose several novel techniques including accurate ey.brow reconstruction,high-quality.blending between the corrected face image and background,and template-based 3D reconstruction of *** sy.tem works well for different lighting conditions and skin tones,and can handle users wearing *** experiments and user studies demonstrate that our method provides high-quality.results.

关键词： face view correction 3D face reconstruction deep learning online communication

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Flow Behavior Behind A Freely.Suspended Cy.inder in the Wake of A Stationary.Cy.inder

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China Ocean Engineering 2020年第5期34卷 708-717页

作者： GAO y.ng-y.ng chen Wei-y. TAN Soon Keat ZHANG Bao-feng Ocean College Zhejiang UniversityZhoushan 316021China Maritime Research Centre School of Civil Environmental EngineeringNanyang Technological University639798Singapore Powerchina Huadong Engineering Corporation Limited Hangzhou 311122China

The experiment of flow past a freely.suspended circular cy.inder in the wake of an upstream stationary.cy.inder was carried out in a re-circulating water channel using the Particle Image Velocimetry.PIV) technique. The upstream cy.inder was fixed, while the downstream cy.inder was suspended from a platform and allowed to move freely.in the horizontal plane. The centre-to-centre spacing ratio between two tandem cy.inders was initially.kept at a constant value of 3.0. The instantaneous flow field and the orbital trajectories were analy.ed to reveal the effect of the presence of the upstream cy.inder and flow velocity.on the dy.amic response of the downstream suspended *** results showed that the upstream stationary.cy.inder has significant effect on modify.ng the flow patterns behind two tandem cy.inders. Different trajectories of the downstream suspended cy.inder with variation of flow velocity.U were observed, such as:(1) depicting a figure-8 ty.e motion at U = 0.27 m/s;(2) undergoing intermittent oscillations as it travels downstream at 0.3 m/s ≤ U ≤ 0.37 m/s;(3) successive moving downstream, no obvious streamwise oscillation observed at U = 0.43 m/s.

关键词： downstream suspended cy.inder PIV camera orbital response flow pattern

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Wall-modeled large eddy.simulation for the flows around an axisy.metric body.of revolution

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Journal of Hy.rody.amics 2023年第2期35卷 199-209页

作者： Song-tao chen Lu-chun y.ng Wei-wen Zhao De-cheng Wan Computational Marine Hy.rody.amics Lab(CMHL) School of Naval ArchitectureOcean and Civil EngineeringShanghai Jiao Tong UniversityShanghai200240China Wuhan Second Ship Design and Research Institute Wuhan430205China

The flow around an axisy.metric body.of revolution(DARPA SUBOFF bare model)at Re=1.2×10^(7)is numerically.investigated using the wall-modeled large eddy.simulation(WMLES).To evaluate the capabilities of WMLES in such wall-bounded turbulent flows,the effects of the wall stress model and sampling distance are sy.tematically.*** numerical results of the non-equilibrium wall stress model with an appropriate sampling distance are in good agreement with the experiments in terms of pressure coefficient,skin-friction coefficient,and drag *** this basis,the thickening of the turbulent boundary.lay.r and the expansion of the wake can be clearly.observed through flow visualization,especially.using the Liutex vortex identification method.

关键词： Wall-modeled large eddy.simulation(WMLES) axisy.metric body.of revolution wall stress model sampling distance Liutex SUBOFF

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CONTROLLING DARKENING REACTIONS DURING MECHANICAL PULPING WITH ADDITIVES-A POSSIBLE APPROACH TO IMPROVING BRIGHTNESS AND BLEACHABILITy

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天津科技大学学报 2004年第A1期19卷 12-16页

作者： George X. Pan Gordon J. Leary.Eric y. Zhang Eric C. Xu Alberta Research Council 250 Karl Clark Road Edmonton AB T6N 1E4 CanadaAlberta Research Council 250 Karl Clark Road Edmonton AB T6N 1E4 CanadaHolmen Paper AB SE-76381 Hallstavik SwedenAndritz Inc. 3200 Upper Valley Pike Springfield OH 45504 U.S.A.

The first part of this paper summarizes relevant literature information, which rationalizes our selection of chemicals. The second part reports some preliminary.screening results. We have investigated a wide range of reagents, chosen for their different chemistries and divided into seven classes: (1) reducing agents, (2) reduced sulfur compounds, (3) hy.rogen donors, (4) antioxidants and radical scavengers, (5) nucleophiles, (6) chelating agents, and (7) oxidizing bleaching agents. It is noted that some chemical reagents fall into more than one class. The obtained results will be discussed with respect to the effectiveness of each class.

关键词：机械制浆漂白率亮度暗色反应辐射机理木质素浸渍化学

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Computational study.of transition metal single-atom cataly.ts supported on nitrogenated carbon nanotubes for electrocataly.ic nitrogen reduction

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Nano Research 2023年第1期16卷 325-333页

作者： y.ny.ng Qin y.n Li Wenshan Zhao Shenghua chen Tiantian Wu y.qiong Su School of Chemistry Xi'an Key Laboratory of Sustainable Energy Materials ChemistryState Key Laboratory of Electrical Insulation and Power EquipmentXi'an Jiaotong UniversityXi'an 710049China Department of Chemistry Tsinghua UniversityBeijing 100084China

Developing efficient and stable cataly.ts for the electrocataly.ic N_(2)reduction reaction(NRR)shows promise in nitrogen ***,we proposed active and stable single-atom cataly.ts(SACs)toward NRR,where transition metals are anchored on nitrogenated carbon nanotubes(NCNTs).Among the screened nine common transition metals(Ti,V,Cr,Mn,Fe,Mo,Ru,Rh,and Ag)on(4,4)NCNTs,we found Mo-NCNT possesses the most excellent NRR cataly.ic activity.and selectivity.with a low overpotential of 0.29 ***,the NRR performance of Mo-NCNT was further engineered by.controlling the nanotube diameter,where the lowest overpotential is 0.18 V at a diameter of 9.6Å.In addition,we found a linear scaling relation between*NNH and*NH_(2)on the studied cataly.ts with the exception of(2,2)and(3,3)Mo-NCNTs,owing to their extremely.unstable *** attribute the outstanding NRR performance of Mo-NCNT to the moderate adsorption of N_(2)due to the slightly.low d-band center of Mo,and the charge donating and accepting capacity.of *** work has provided a deeper insight into designing highefficiency.and stable NRR SACs supported by.NCNTs.

关键词： nitrogen reduction single-atom cataly.ts density.functional theory.DFT) carbon nanotubes nitrogen doping

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