A5055985834- Microstructure and mechanical properties
- Metal and Thin Film Mechanics
- High Temperature Alloys and Creep
- Force Microscopy Techniques and Applications
- Advanced Surface Polishing Techniques
- Nuclear Materials and Properties
- Advanced ceramic materials synthesis
- Advanced Materials Characterization Techniques
- Fusion materials and technologies
- Semiconductor materials and devices
- High-pressure geophysics and materials
- Semiconductor materials and interfaces
- Silicon and Solar Cell Technologies
- High-Velocity Impact and Material Behavior
- Hydrogen embrittlement and corrosion behaviors in metals
- Advanced materials and composites
- Numerical methods in engineering
- Diamond and Carbon-based Materials Research
- Ion-surface interactions and analysis
- Silicon Carbide Semiconductor Technologies
- Boron and Carbon Nanomaterials Research
- Hearing, Cochlea, Tinnitus, Genetics
- Mechanical and Optical Resonators
- Microstructure and Mechanical Properties of Steels
- Aluminum Alloy Microstructure Properties
Soochow University
2022-2024
Jilin University
2024
First Hospital of Jilin University
2024
Lawrence Livermore National Laboratory
2005-2023
First Affiliated Hospital of Soochow University
2022
Southeast University
2019-2022
Nantong University
2019-2022
Nanjing Tech University
2019
University of California System
2004
Massachusetts Institute of Technology
1994-2001
Tight-binding molecular dynamics simulations are performed to study self-diffusion, interstitial-vacancy recombination, and formation volumes of point defects in crystalline silicon. The results show that (i) self-diffusion is dominated by vacancies (V) at low temperature interstitials (I) high temperature; (ii) recombination room leads a metastable I-V complex, which has an annihilation energy barrier 1.1 eV; (iii) interstitial vacancy relaxation silicon approximately equal magnitude opposite sign.
Three-dimensional (3D) discrete dislocation dynamics simulations were used to calculate the effects of anisotropy line tension (increasing Poisson's ratio, ν) on strength single-ended sources in micron-sized volumes with free surfaces and compare them double-ended equal length. Their plastic response was directly modelled within a 1 µm3 volume composed single crystal fcc metal. In general, are stronger than an length exhibit no significant from truncating long-range elastic fields at this...
Super-resolution fluorescence imaging reveals a previously unknown novel structure of spectrin in inner ear hair cells.
Cochlear implantation has become the most effective treatment method for patients with profound and total hearing loss. However, its therapeutic efficacy is dependent on number normal physiological function of cochlear implant-targeted spiral ganglion neurons (SGNs). Electrical stimulation can be used as an cue to regulate morphology excitatory cells. Therefore, it important develop efficient implant electroacoustic (EAS) system study behavior SGNs. In this work, we present electrical...
A classical bond-order interatomic potential function developed by Tersoff has been applied to study the structural, mechanical, thermal, vibrational, and surface properties of \ensuremath{\beta}-SiC. The modified eliminate unphysical effects associated with large volumetric deformation. Fundamental bulk properties, e.g., phonon dispersion curves, thermal expansion coefficient, equation state, elastic constants, as well relaxation reconstruction have studied. Comparisons available literature...
A simulation of the deflection a single wall nanotube under manipulation an atomic force microscope tip revealed key feature characterizing deformation at relatively small bending angles to be reversible transition from sp(2) sp(3) bonding configurations in region, leading 2 orders magnitude reduction conductance consistent with our most recent experimental observation. local analysis elucidating underlying physics findings is also discussed.
We describe an innovative highly parallel application program, ParaDiS, which computes the plastic strength of materials by tracing evolution dislocation lines over time. discuss issues scaling code to tens thousands processors, and present early results run on a prototype BlueGene/L supercomputer being developed IBM in partnership with US DOE's ASC program.
Thermodynamic properties of silicon (diamond cubic phase) are calculated using an empirical many-body potential developed by Tersoff [Phys. Rev. Lett. 56, 632 (1986)] based on the concept bond order. It is shown that this model gives predictions in good agreement with experiment for those governed energetics (free energy, entropy, and heat capacity). The thermal expansion coefficient less well described, which traced to fact potential, its present version, overly stiff therefore unable...
Brittle fracture of β-SiC (polytype 3C) under hydrostatic tension has been modeled by molecular dynamics simulation using an interatomic potential function that treats the solid as fully covalent. The critical stress at which lattice becomes structurally unstable is shown to agree quantitatively with predicted stability analysis based on elastic stiffness coefficients. instability mode spinodal (vanishing bulk modulus), and decohesion occurs spontaneous nucleation cracking {111} shuffle...
Dislocations intersecting free surfaces present a challenge for numerical implementation of traction-free boundary conditions in dislocation dynamics simulations. The difficulty arises when singular analytic expressions stress fields need to be used combination with methods calculate image due the surfaces. A new hybrid method is developed here which and non-singular parts are dealt separately. solution semi-infinite straight surface elastic half-space account part stress, while remaining...
In body centred cubic (bcc) crystals at low temperatures, the thermally activated motion of screw dislocations by kink-pair mechanism governs yield properties and also affects strain hardening properties. this work, average strength dislocation junctions is derived numerically estimated in case Nb Ta crystals. This allows us to extend an existing simulation dynamics bcc a line through random distribution forest obstacles. Numerical results are presented two 160 K 215 K. They complemented...
Applying a bond-order potential model to describe binary covalent solid (SiC) in molecular dynamics simulation, we show that under hydrostatic compression the homogeneous lattice undergoes an amorphous transition triggered by elastic shear instability, with critical pressure agreeing well determined from finite-load stability criteria. By modifying suppress either atomic size difference or mixed bond preference, demonstrate former effect can be dominant favoring amorphization over...
This study focuses on modelling the behaviour of single crystal tantalum in Stage 0 characterized by large activity edge dislocations and relative inactivity screw dislocations. The multiplication dislocation density is investigated using dynamics (DD) simulations a based continuum model plasticity. DD are used to guide constitutive development determine its material specific parameters. While not all constants needed can be determined, due limited strain histories considered simulations,...