搜索结果: 1-15 共查到“理学 granular”相关记录42条 . 查询时间(0.163 秒)
Numerical simulations of granular dynamics:I. Hard-sphere discrete element method and tests
Asteroids, Surfaces Collisional physics Geological processes Regoliths
2015/12/25
We present a new particle-based (discrete element) numerical method for the simulation of granular dynamics, with application to motions of particles on small solar system body and planetary surfaces....
Numerical simulations of granular dynamics II:Particle dynamics in a shaken granular material
Asteroids, Surfaces Collisional physics Geological processes Regoliths Experimental techniques
2015/12/25
Surfaces of planets and small bodies of our Solar System are often covered by a layer of granular material that can range from a fine regolith to a gravel-like structure of varying depths. Therefore, ...
Computational modeling of deformation bands in granular media. I. Geological and mathematical framework
Deformation bands Granular media
2015/7/1
Failure of granular media under natural and laboratory loading conditions involves a variety of micromechanical processes producing several geometrically, kinematically, and texturally distinct types ...
Computational modeling of deformation bands in granular media. II. Numerical simulations
Deformation bands Granular media
2015/7/1
Development of accurate mathematical models of geomaterial behavior requires a more fundamental understanding of the localization phenomena; in particular, the important factors responsible for the in...
Geological and mathematical framework for failure modes in granular rock
Failure modes Deformation bands Shear bands Compaction bands Dilation bands Fracturing of sandstone
2015/7/1
We synthesize all the available data on failure processes in granular rock and provide a geological framework for the corresponding structures. We describe two categories: (1) sharp discontinuities ma...
Particle size distributions by laser diffraction: sensitivity of granular matter strength to analytical operating procedures
Particle size distributions laser diffraction granular matter strength analytical operating procedures
2014/12/31
We tested laser diffraction particle size analysis in poorly coherent carbonate platform cataclastic breccias and unfaulted quartz-rich eolian sands, representing low- and high-strength granular mater...
Measurements of Gravity Driven Granular Channel Flows
Measurements of Gravity Driven Granular Channel Flows
2014/11/20
This dissertation presents experiments that studied two gravity driven granular channel flows. The first experiment used magnetic resonance imaging to measure the density and displacement distribution...
In this thesis we report experimental and simulation study of granular gases. As a non-equilibrium system composed of macroscopic particles, a granular gas often shows a picture similar to a molecular...
Quantifying the Effcts of Cementation on the Hydromechanical Properties of Granular Porous Media Using Discrete Element and Poroelastic Models
Cementation on the Hydro Mechanical Properties Granular Porous Media Discrete Element Poroelastic Models
2014/10/22
Cementation is known to significantly influence the mechanical and hydrologic properties of granular porous media by increasing the stiffness of the elastic response to stress and reducing permeabilit...
UNCERTAINTY MANAGEMENT IN SEISMIC VULNERABILITY ASSESSMENT USING GRANULAR COMPUTING BASED ON COVERING OF UNIVERSE
Seismic Vulnerability Assessment Granular Computing Model, Multi Criteria Decision Making
2014/4/24
Earthquake is an abrupt displacement of the earth's crust caused by the discharge of strain collected along faults or by volcanic
eruptions. Earthquake as a recurring natural cataclysm has always be...
Periodic Travelling Waves in Dimer Granular Chains
Periodic Travelling Waves Dimer Granular Chains Pattern Formation and Solitons
2012/4/26
We study bifurcations of periodic travelling waves in granular dimer chains from the anti-continuum limit, when the mass ratio between the light and heavy beads is zero. We show that every limiting pe...
Photospheric Signatures of Granular-scale Flux Emergence and Cancellation at the Penumbral Boundary
Photospheric Signatures Granular-scale Flux Emergence Cancellation Penumbral Boundary
2011/10/13
We studied flux emergence events of sub-granular scale in a solar active region. New Solar Telescope (NST) of Big Bear Solar Observatory made it possible to clearly observe the photospheric signature ...
Photospheric Signatures of Granular-scale Flux Emergence and Cancellation at the Penumbral Boundary
Photospheric Signatures Granular-scale Flux Emergence Cancellation Penumbral Boundary
2011/10/17
We studied flux emergence events of sub-granular scale in a solar active region. New Solar Telescope (NST) of Big Bear Solar Observatory made it possible to clearly observe the photospheric signature ...
Granular packings of cohesive elongated particles
Granular matter Molecular Dynamics nonspherical particles Quicksand Collapsible soil
2011/8/17
Abstract: We report numerical results of effective attractive forces on the packing properties of two-dimensional elongated grains. In deposits of non-cohesive rods in 2D, the topology of the packing ...
Crossover from negative to positive shear rate dependence in granular friction
Crossove granular friction
2011/9/9
We conduct an experiment on the frictional properties of granular matter over a wide range of shear rate that covers both the quasistatic and the inertial regimes. We show that the friction coefficien...