High‐frequency normal‐mode calculations in deep water

High-frequency sea-level changes recorded in deep-water carbonates of the Upper Cretaceous Dol Formation (island of Brač, Croatia)The upper part of the Middle Coniacian/Santonian-Middle Campanian deep-water Dol Formation of the island of Brač is composed of countless fine-grained allodapic intercalations deposited in an intraplatform trough. Within the studied section 13 beds can be distinguished, each defined by its lower part built up of dark grey limestone with abundance of branched, horizontally to subhorizontally oriented burrows, and the upper part, in which the light grey to white limestone contains larger burrows, rarely branched, showing no preferential orientation. The lower, dark grey, intensively bioturbated levels are interpreted as intervals formed during high-frequency sea-level highstands, while the upper, light grey-to-white levels are interpreted as intervals formed during the high-frequency sea-level lowstands. Cyclic alternation of these two intervals within the fine-grained allodapic beds is interpreted as the interaction between the amount of carbonate production on the platform margin and the periodicity and intensity of shedding and deposition in the distal part of toe-of-slope environment, which is governed by Milankovitch-band high frequency sea-level changes.

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Interannual modulation of extratropical high frequency variability

Annals of Geophysics ◽

10.4401/ag-3886 ◽

1997 ◽

Vol 40 (4) ◽

Author(s):

R. Caballero

Keyword(s):

Normal Mode ◽

Time Scales ◽

High Frequency ◽

Spherical Geometry ◽

Simple Explanation ◽

Space And Time ◽

High Frequency Variability ◽

Hemisphere Winter ◽

Selection Of

A simple explanation is presented for the observed interannual changes in the dominant space and time scales of Northem Hemisphere winter extratropical high frequency variability. It is found that such changes can suc- cessfully be predicted by linearizing a 2-level quasi-geostrophic mode] in spherical geometry around the ob- served zona] mean states. The mechanisms responsible for the selection of the most unstable normal mode are investigated.

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High-frequency normal mode propagation in aluminum cylinders

Scientific Investigations Report ◽

10.3133/sir20095142 ◽

2009 ◽

Cited By ~ 1

Author(s):

Myung W. Lee ◽

William F. Waite

Keyword(s):

Normal Mode ◽

High Frequency ◽

Mode Propagation

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I. A computer program for generation of a complete set of coordinates and force matrices for normal mode calculations of crystals and molecules

Computer Physics Communications ◽

10.1016/s0010-4655(84)82662-4 ◽

1984 ◽

Vol 35 ◽

pp. C-461

Author(s):

Flemming Yssing Hansen

Keyword(s):

Computer Program ◽

Normal Mode ◽

Normal Mode Calculations ◽

Complete Set

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VIBRATIONAL MODES IN SMALL Agn, Aun CLUSTERS: A FIRST PRINCIPLE CALCULATION

International Journal of Modern Physics B ◽

10.1142/s0217979209053436 ◽

2009 ◽

Vol 23 (31) ◽

pp. 5819-5834 ◽

Cited By ~ 9

Author(s):

OLCAY ÜZENGI AKTÜRK ◽

OĞUZ GÜLSEREN ◽

MEHMET TOMAK

Keyword(s):

Normal Mode ◽

Density Functional ◽

Local Density ◽

Scanning Tunneling ◽

Generalized Gradient ◽

Functional Formalism ◽

First Principle Calculation ◽

Pseudopotential Calculations ◽

Normal Mode Calculations ◽

Small Clusters

Although the stable structures and other physical properties of small Ag n and Au n, were investigated in the literature, phonon calculations are not done yet. In this work, we present plane-wave pseudopotential calculations based on density-functional formalism. The effect of using the generalized gradient approximation (GGA) and local density approximation (LDA) to determine the geometric and electronic structure and normal mode calculations of Ag n and Au n, is studied up to eight atoms. Pure Au n and Ag n clusters favor planar configurations. We calculated binding energy per atom. We have also calculated the normal mode calculations and also scanning tunneling microscope (STM) images for small clusters for the first time.

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Comparison of Classical Molecular Dynamics and Ab Initio Modeling of Discrete Breathers in Graphene

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.258.81 ◽

2016 ◽

Vol 258 ◽

pp. 81-84

Author(s):

Ivan P. Lobzenko ◽

George M. Chechin ◽

Sergey V. Dmitriev

Keyword(s):

Molecular Dynamics ◽

Normal Mode ◽

High Frequency ◽

Density Functional ◽

Uniaxial Strain ◽

Functional Theory ◽

Classical Molecular Dynamics ◽

Zigzag Direction ◽

Discrete Breathers ◽

Amplitude Dependency

A density functional theory based method was used to model dynamics of high frequency delocalized normal mode and discrete breathers in graphene at T = 0 K. For the normal mode the comparison of results was made with modeling by means of classical molecular dynamics. Discrete breathers have been found only in presence of uniaxial strain applied in “zigzag” direction. The oscillations of breather core atoms appeared to be polarized along “arm-chair” direction. In the case of “arm-chair” uniaxial strain there were no breathers found. The frequency on the amplitude dependency of DBs in graphene corresponds to the soft nonlinearity type that is due to the soft nonlinearity type of the high frequency normal mode on which breather is constructed.

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