scholarly journals Consistent kinetic-continuum dissociation model. II. Continuum formulation and verification

2020 ◽  
Vol 152 (22) ◽  
pp. 224303 ◽  
Author(s):  
Narendra Singh ◽  
Thomas Schwartzentruber
Keyword(s):  
Continuum Formulation ◽  
Dissociation Model

Coulomb Dissociation of Nanoparticles Grazing along Organic Surfaces

2012 ◽  
Vol 67 (5) ◽  
pp. 296-302
Author(s):  
Viacheslav V. Komarov ◽  
Anna M. Popova ◽  
Lothar Schmidt ◽  
Hartmut Jungclas
Keyword(s):  
Small Molecules ◽  
Minimum Distance ◽  
Vibrational Energy ◽  
Coulomb Repulsion ◽  
Photon Flux ◽  
Coulomb Dissociation ◽  
Surface Molecules ◽  
Hydrocarbon Chains ◽  
Dissociation Model ◽  
Molecular Nanoparticles

A Coulomb dissociation model is presented for molecular nanoparticles, e.g. nanoclusters consisting of identical atoms or small molecules. These nanoparticles graze with velocities less than the Bohr velocity (108 cm=s) along an organic surface at atomic distances. The surface molecules contain IR-antennas, which consist of periodically located identical diatomic valence bonds with significant dipole momenta, e.g. hydrocarbon chains like (CH2)n. Here, we analyse the Coulomb interaction of these surface molecules with grazing nanoparticles, which do not contain any IR-antennas, e.g. fullerene molecules. Provided that the grazing velocity is in the range of 105 - 107 cm=s and the minimum distance of the grazing nanoparticles to the surface is approximately 2 Å , the IR-antennas of the interacting surface molecules will collect vibrational energy quanta, the so-called excimols. The number of excimols accumulated during the interaction time of at least 1 ps increases with the number of dipoles in the IR-antennas. Excimol energy can be transmitted back to the grazing nanoparticle by a ps-photon flux, which is estimated intense enough to induce multi-ionization of nanoparticle constituents. The resulting charges inside the nanoparticles cause high Coulomb repulsion forces, which will be able to promptly dissociate them.

scholarly journals The quark dissociation model of photoproduction

1967 ◽  
Vol 1 (10) ◽  
pp. 648-654 ◽  
Author(s):  
K. Kajantie ◽  
J.S. Trefil
Keyword(s):  
Dissociation Model

Shakedown in Frictional Contact Problems

2007 ◽  
Author(s):  
J. R. Barber ◽  
A. Klarbring ◽  
M. Ciavarella
Keyword(s):  
Frictional Contact ◽  
Elastic System ◽  
Contact Problems ◽  
Sufficient Condition ◽  
Normal Contact ◽  
Linear Elastic ◽  
Periodic Loading ◽  
Continuum Formulation ◽  
Complete Contact ◽  
The Continuum

If a linear elastic system with frictional interfaces is subjected to periodic loading, any slip which occurs generally reduces the tendency to slip during subsequent cycles and in some circumstances the system ‘shakes down’ to a state without slip. It has often been conjectured that a frictional Melan’s theorem should apply to this problem — i.e. that the existence of a state of residual stress sufficient to prevent further slip is a sufficient condition for the system to shake down. Here we discuss recent proofs that this is indeed the case for ‘complete’ contact problems if there is no coupling between relative tangential displacements at the interface and the corresponding normal contact tractions. By contrast, when coupling is present, the theorem applies only for a few special two-dimensional discrete cases. Counter-examples can be generated for all other cases. These results apply both in the discrete and the continuum formulation.

Continuum formulation of the Scheutjens-Fleer lattice statistical theory for homopolymer adsorption from solution

2005 ◽  
Vol 123 (17) ◽  
pp. 174901 ◽  
Author(s):  
Vlasis G. Mavrantzas ◽  
Antony N. Beris ◽  
Frans Leermakers ◽  
Gerard J. Fleer
Keyword(s):  
Statistical Theory ◽  
Continuum Formulation ◽  
Adsorption From Solution
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