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Nano Research 2014年第8期7卷 1195-1204页

作者： Xubo lin Ning gu State Key Laboratory of Bioelectronics and Jiangsu Key Laboratory for Biomaterials and Devices School of Biological Science & MedicalEngineering Southeast University Nanjing 210096 China

The main phase transition temperature of a lipid membrane, which is vital for its biomedical applications such as controllable drug release, can be regulated by encapsulating hydrophobic nanoparticles into the membrane. However, the exact relationship between surface properties of the encapsulating nanoparticles and the main phase transition temperature of a lipid membrane is far from clear. In the present work we performed coarse-grained molecular dynamics simulations to meet this end. The results show the surface roughness of nanoparticles and the density of surface-modifying molecules on the nanoparticles are responsible for the regulation. Increasing the surface roughness of the nanoparticles increases the main phase transition temperature of the lipid membrane, whereas it can be decreased in a nonlinear way via increasing the density of surface-modifying molecules on the nanoparticles. The results may provide insights for understanding recent experimental studies and promote the applications of nanoparticles in controllable drug release by regulating the main phase transition temperature of lipid vesicles.

关键词： lipid bilayer phase transition nanoparticle surface roughness density surface molecules

Degrees of freedom for energy storage material

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Carbon Energy 2022年第4期4卷 633-644页

作者： Yue Gong lin gu Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijingChina CAS Key Laboratory of Standardization and Measurement for Nanotechnology CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijingChina School of Physical Science University of Chinese Academy of SciencesBeijingChina Songshan Lake Materials Laboratory DongguanChina

Building a bridge between properties and structures has always been the key focus of any materials ***,energy storage materials,especially lithium-ion batteries,are crucial both in daily life and for the research ***,there is an urgent need to discover the functionality origin of battery performances to improve and design better material *** originates from local symmetry and *** symmetry can be described by four fundamental degrees of freedom:lattice,charge,orbital,and *** the basis of this,detailed descriptions of the battery's properties in terms of lattice,charge,orbital,and spin are presented from the perspective of frontier transmission electron microscopy in this ***,frontier in situ methods are introduced to record the dynamic structural evolution process during the battery *** discussion from the perspectives of both materials and characterizations is provided at the end of this review.

关键词： charge in situ lattice orbital spin transmission electron microscopy

High Quality YBCO Film Growth on SrTiO_3-Buffered LaAlO_3 Substrate by Full Solution Method

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Journal of Materials Science & Technology 2008年第6期24卷 899-902页

作者： Sansheng WANG lin WANG Bingfu gu Department of Physics Tsinghua University Beijing 100084 China

A full solution method has been developed as a low cost process of YBa2Cu3OT-x （YBCO） coated conductor fabrication. In this study, highly biaxially textured SrTiO3 （STO） buffer layers were fabricated on LaAlO3 （LAO） single crystal substrates by sol-gel method using metal alkoxides as the staring precursor materials. High quality YBCO superconducting film was then fabricated on STO-buffered LAO substrate by trifluoroacetic metalorganic deposition （TFA-MOD） method. For the YBCO superconducting film, only （001） diffraction peaks can be detected by XRD （X-ray diffraction） analysis with no other phases detectable. Especially, Inplane texture of YBCO film is improved compared to that of STO buffer layer from phi scans analysis, which indicates the self-epitaxy phenomenon explained by considering interracial energy. STO and YBCO films both show c-axis oriented grains growth and have uniform surface microstructure. A critical transition temperature, TC （R=0） of 89.5 K and a critical current density of 2 mA/cm2 （77 K, self-field） were obtained for a 0.2μm thick YBCO film on STO-buffered LAO substrate. No reaction between YBCO and STO was detected by XRD analysis. This full solution process may provide a promising low cost fabrication route for YBCO coated conductors on metal tape.

关键词： YBCO coated conductor Full solution Epitaxy Superconductivity

A review on conventional and nonconventional machining of SiC particle-reinforced aluminium matrix composites

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Advances in Manufacturing 2020年第3期8卷 279-315页

作者： Ji-Peng Chen lin gu guo-Jian He School of Mechanical and Electronic Engineering Nanjing Forestry UniversityNanjing 210037People’s Republic of China Department of Mechanical Engineering Polytechnic University of MilanPiazza Leonardo da Vinci 32Milan 20133Italy State Key Laboratory of Mechanical System and Vibration School of Mechanical EngineeringShanghai Jiao Tong UniversityShanghai 200240People’s Republic of China

Among the various types of metal matrix composites,SiC particle-reinforced aluminum matrix composites(SiCp/Al)are finding increasing applications in many industrial fields such as aerospace,automotive,and ***,SiCp/Al composites are considered as difficult-to-cut materials due to the hard ceramic reinforcement,which causes severe machinability degradation by increasing cutting tool wear,cutting force,*** improve the machinability of SiCp/Al composites,many techniques including conventional and nonconventional machining processes have been *** purpose of this study is to evaluate the machining performance of SiCp/Al composites using conventional machining,i.e.,turning,milling,drilling,and grinding,and using nonconventional machining,namely electrical discharge machining(EDM),powder mixed EDM,wire EDM,electrochemical machining,and newly developed high-efficiency machining technologies,e.g.,blasting erosion arc *** research not only presents an overview of the machining aspects of SiCp/Al composites using various processing technologies but also establishes optimization parameters as reference of industry applications.

关键词： SiCp/Al Machining Conventional Wear mechanism Nonconventional Performance

New insights into FeS/persulfate system for tetracycline elimination:Iron valence,homogeneous-heterogeneous reactions and degradation pathways

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Journal of Environmental Sciences 2022年第2期34卷 48-58页

作者： Jinhong Fan Ying Cai Shihao Shen lin gu State Key Laboratory of Pollution Control and Resources Reuse College of Environmental Science and EngineeringTongji UniversityShanghai 200092China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092China

In this study,complete tetracycline(TTC)and above 50%of total organic carbon(TOC)were removed by Fe S/PS after 30 min under optimized *** free radicals and high-valent iron ions were identified to generate in the process,the apparent similarity between intermediate products of Fe S/PS,Fe/PS,and UV/PS systems demonstrated that the degradation of TTC was due to sulfate radicals(SO_(4)·^(-))and hydroxyl radicals(·OH).Based on the reaction between free radicals and organic matter,we speculated that TTC in the Fe S/PS system was decomposed and mineralized by dehydration,dehydrogenation,hydroxyl addition,demethylation,substitution,E-transfer,and ***,a new understanding of Fe S-mediated PS activation based on stoichiometry and kinetic analysis showed that there were both homogeneous and heterogeneous reactions that occurred in the entire ***,due to the effect of p H on the dissolution of iron ions,the homogeneous reaction became the principal process with iron ions concentration exceeding 1.35 mg/*** work provides a theoretical basis for the study of the degradation of TTC-containing wastewater by the iron-based advanced oxidation process.

关键词： Tetracycline Persulfate activation Iron valence Homogeneous-heterogeneous reactions Degradation pathways

Simulation of temperature distribution and discharge crater of SiC_(p)/Al composites in a single-pulsed arc discharge

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Chinese Journal of Aeronautics 2021年第9期34卷 37-46页

作者： Jipeng CHEN lin gu Wansheng ZHAO Mario guAGLIANO School of Mechanical and Electronic Engineering Nanjing Forestry UniversityNanjing 210037China State Key Laboratory of Mechanical System and Vibration School of Mechanical EngineeringShanghai Jiao Tong UniversityShanghai 200240China Department of Mechanical Engineering Politecnico Di MilanoPiazza Leonardo da Vinci32Italy

SiC_(p)/Al composites are difficult-to-cut *** recent years,electrical arc discharge machining has been developed to improve the machinability of these ***,there is a big challenge to build a satisfactory heat transfer model of SiC_(p)/Al composites in the arc *** is not only because of the material property difference between the reinforcement and matrix material but also because of the micro-dimension Si C *** paper established a new heat conduction simulation model considering the Si C particle-Al matrix interface and the phase change effects in a single-pulsed arc discharge of SiC_(p)/Al composites.A novel Si C particle-Al matrix cell geometric model was designed ***,the temperature distribution at a different depth from the workpiece surface was analyzed,the influence of sic volume fraction on temperature field was studied,and the contribution of the interface thermal resistance and latent heat were *** demonstrate the validity of the new numerical model,comparisons and verifications were ***,the method of improving the model was proposed and the machining mechanism of arc discharge of SiC_(p)/Al matrix materials was *** was found that high temperature is prone to concentrate on the surface layers of the workpiece especially when the Si C fraction is high,also,the temperature fluctuates respectively at the evaporation point of aluminum and Si C,and the Si C-Al resistance has less influence on temperature distribution compared to latent heat,*** model build in this work improves the simulation accuracy observably compared to the previous model,and the simulation work will help to acquire a detailed mechanism of material removal of SiC_(p)/Al composites in the arc discharge machining.

关键词： Arc discharge Discharge crater SiC_(p)/Al composites Single-pulsed Temperature distribution

Interface of transition metal oxides at the atomic scale

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Science China(Physics,Mechanics & Astronomy) 2016年第9期59卷 1-9页

作者： Tong-Tong Shang Xin-Yu Liu lin gu Beijing National Laboratory Jor Condensed Matter Physics Institute of PhysicsChinese Academy of Sciences Beijing 100190China Collaborative Innovation Center of Quantum Matter Beijing 100190China

Remarkable phenomena arise at well-defined heterostructures, composed of transition metal oxides, which is absent in the bulk counterpart, providing us a paradigm for exploring the various electron correlation effects. The functional properties of such heterostructures have attracted much attention in the microelectronic and renewable energy fields. Exotic and unexpected states of matter could arise from the reconstruction and coupling among lattice, charge, orbital and spin at the interfaces. Aberration-corrected scanning transmission electron microscopy （STEM） is a powerful tool to visualize the lattice structure and electronic structure at the atomic scale. In the present study some novel phenomena of oxide heterostructures at the atomic scale are summarized and pointed out from the perspective of electron microscopy.

关键词： interface transition metal oxides STEM strong correlation

Numerical Simulation of Peen Forming

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上海交通大学学报 2004年第z2期38卷 73-78页

作者： Kang Xiaoming Ma Zeen gu lin Chen ming School of Mechanical Engineering Shanghai Jiaotong University Shanghai200030 China Department of Aircraft Manufacturing Engineering Northwestern Polytechnical UniversityXi''an710072China School of Mechanical Engineering Shanghai Jiaotong University Shanghai200030 China School of Mechanical Engineering Shanghai Jiaotong University Shanghai200030 China

Peen forming is the most important process for the manufacturing of integral wing skin panels. In order to determine peening parameters, an equivalent deformation theory was proposed in which peening parameters are transformed into equivalent nodal forces. In this study, a linear elastic shell finite element method is adopted. Other related problems such as wing skin panel modeling and peening scheme analysis were also outlined. The method has been applied to manufacturing panels of a certain Chinese aircraft and was proved to be effective in reducing peening experimental tests and improving products quality.

关键词： peen forming wing skin panel equivalent deformation theory numerical simulation

Optimal Reinsurance and Investment Strategy with Delay in Heston’s SV Model

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Journal of the Operations Research Society of China 2021年第2期9卷 245-271页

作者： Chun-Xiang A Ai-lin gu Yi Shao School of Mathematics and Statistics Zhaoqing UniversityZhaoqing 526061GuangdongChina School of Applied Mathematics Guangdong University of TechnologyGuangzhou 510520China

In this paper,we consider an optimal investment and proportional reinsurance problem with delay,in which the insurer’s surplus process is described by a jump-diffusion *** insurer can buy proportional reinsurance to transfer part of the insurance claims *** addition to reinsurance,she also can invests her surplus in a financial market,which is consisted of a risk-free asset and a risky asset described by Heston’s stochastic volatility(SV)*** the performance-related capital flow,the insurer’s wealth process is modeled by a stochastic differential delay *** insurer’s target is to find the optimal investment and proportional reinsurance strategy to maximize the expected exponential utility of combined terminal *** explicitly derive the optimal strategy and the value ***,we provide some numerical examples to illustrate our results.

关键词： Proportional reinsurance Stochastic differential delay equation(SDDE) Heston’s stochastic volatility(SV)model Hamilton–Jacobi–Bellman(HJB)equation

Modeling of flow and debris ejection in blasting erosion arc machining in end milling mode

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Advances in Manufacturing 2020年第4期8卷 508-518页

作者： Ji-Peng Chen lin gu Wan-Sheng Zhao Mario guagliano School of Mechanical and Electronic Engineering Nanjing Forestry UniversityNanjing 210037People's Republic of China Department of Mechanical Engineering Polytechnic University of MilanPiazza Leonardo da Vinci32MilanItaly State Key Laboratory of Mechanical System and Vibration School of Mechanical EngineeringShanghai Jiao Tong UniversityShanghai 200240People's Republic of China

Blasting erosion arc machining(BEAM)is a typical arc discharge machining technology that was developed around 2012 to improve the machinability of difficult-to-cut *** milling BEAM has been successfully developed and preliminarily applied in ***,owing to the high complexity of the flow field and the difficulty of observing debris in the discharge gap,studies of the flow and debris in end milling BEAM are *** this study,fluid dynamics simulations and particle tracking are used to investigate the flow characteristics and debris ejection processes in end milling ***,the end milling BEAM m o d e is *** the numerical modeling parameters,geometric models,and simulation methods are presented in ***,the flow distribution and debris ejection are described,analyzed,and *** velocity and pressure distributions of the axial feed and radial feed are observed;the rotation speed and milling depth are found to have almost no effect on the flow velocity ***,debris is ejected more rapidly in the radial feed than in the axial *** particle kinetic energy tends to increase with increasing milling depth,and smaller particles are more easily expelled from the flushing *** study attempts to reveal the flow field properties and debris ejection mechanism of end milling BEAM,which will be helpful in gaining a better understanding of BEAM.

关键词： Modeling Flow Debris ejection Blasting erosion arc machining(BEAM) End milling