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Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Contact discontinuities in finitely long nozzles
有限长喷嘴 接触 不连续性 可压缩欧拉流
2023/5/4
There can be contact discontinuities in the nozzle for the compressible Euler flow. In this talk, we will talk about the cases of the subsonic-supersonic and supersonic-supersonic contact discontinuit...
Non-linear effects in ground deformation at calderas due to the presence of structural discontinuities
ground deformation modeling caldera collapse structural discontinuities
2015/9/14
Non-linear effects in ground deformation at calderas due to the presence of structural discontinuities.
EXTRACTION OF PLANAR PATCHES FROM POINT CLOUDS TO RETRIEVE DIP AND DIP DIRECTION OF ROCK DISCONTINUITIES
Risk assessment Geomorphology Photogrammetry
2015/8/13
Laser scanners and image matching algorithms produce large amounts of 3D data, allowing detailed and accurate descriptions of
objects. This is true, though, only if interactive or automated software...
Effect of discontinuities in Kohn-Sham-based chemical reactivity theory
Effect of discontinuities Kohn-Sham-based chemical reactivity theory Fukui function
2012/2/29
We provide a new derivation of a formula for the Fukui function of density-functional chemical reactivity theory which incorporates the discontinuities in the Kohn-Sham reference system. Orbital relax...
Integrating strong and weak discontinuities without integration subcells and example applications in an XFEM/GFEM framework
Schwarz Christoffel conformal mapping numerical integration extended finite element method quadrature generalized finite element method
2011/9/20
Abstract: Partition of unity methods, such as the extended finite element method (XFEM) allow discontinuities to be simulated independently of the mesh [1]. This eliminates the need for the mesh to be...
On ringing effects near jump discontinuities for periodic solutions to dispersive partial differential equations
ringing effect dispersive equations weak solutions periodic boundary conditions Diophantine approximations Weyl shift method
2011/8/30
Abstract: We consider weak solutions to dispersive partial differential equations with periodic boundary conditions and initial data with jump discontinuities. These are already known to be continuous...
Valid Physical Processes from Numerical Discontinuities in Computational Fluid Dynamics
Numerical Discontinuities Computational Fluid Dynamics
2010/12/10
Due to the limited cell resolution in the representation of flow variables, a piecewise continuous initial reconstruction with discontinuous jump at a cell interface is usually used in modern computat...
Particle acceleration in tangential discontinuities by lower hybrid waves
Particle acceleration tangential discontinuities lower hybrid waves
2009/11/12
We consider the role that the lower-hybrid wave turbulence plays in providing the necessary resistivity at collisionless reconnection sights. The mechanism for generating the waves is considered to be...
Model for vortex turbulence with discontinuities in the solar wind
vortex turbulence discontinuities in the solar wind
2009/11/12
A model of vortex with embedded discontinuities in plasma flow is developed in the framework of ideal MHD in a low b plasma. Vortex structures are considered as a result of 2-D evolution of nonlinear ...
Theory and observation of double discontinuities
Theory observation double discontinuities
2009/11/11
Recent research using high-resolution magnetic field data to examine the interior structures of MHD shocks in interplanetary space and in the magnetotail led to a surprising discovery that a slow-mode...
234U/238U Disequilibrium along stylolitic discontinuities in deep Mesozoic limestone formations of the Eastern Paris basin：evidence for discrete uranium mobility over the last 1–2 million years
uranium isotopes multiple-collector ICP-MS waste management remobilisation migration
2009/5/18
The (234U/238) equilibrium state of borehole core samples from the deep, low-permeability limestone formations surrounding the target argilite layer of the Meuse/Haute-Marne experimental site of the F...
234U/238U Disequilibrium along stylolitic discontinuities in deep Mesozoic limestone formations of the Eastern Paris basin: evidence for discrete uranium mobility over the last 1–2 million years
uranium isotopes multiple-collector ICP-MS waste management remobilisation migration
2009/3/3
The (234U/238) equilibrium state of borehole core samples from the deep, low-permeability limestone formations surrounding the target argilite layer of the Meuse/Haute-Marne experimental site of the F...
Propagation of Velocity Discontinuities on Potential Vorticity Fronts
Velocity Discontinuities Potential Vorticity Fronts
2008/12/27
The propagation of finite-length velocity discontinuities along a potential vorticity front is studied. The front is oriented in a fundamentally north-south direction on the β-plane. The potential vor...
A formulation of Sverdrup dynamics is presented based on a reduced-gravity model in place of the standard approach using the vorticity equation. The integral conservation law of momentum is used to in...
Finding Discontinuities of Piecewise-smooth Functions
Inequalities Stable differentiation Noisy data Discontinuities Jumps Signal processing Edge detection
2008/7/1
Formulas for stable differentiation of piecewise-smooth functions are given. The data are noisy values of these functions. The locations of discontinuity points and the sizes of the jumps across these...