The semi-empirical construction of solitons using ordinary time-dependent nonlinear oscillations

1994 ◽  
Vol 4 (5) ◽  
pp. 801-814 ◽  
Author(s):  
E. Gluskin
Keyword(s):  
Nonlinear Oscillations ◽  
Time Dependent ◽  
Ordinary Time ◽  
Semi Empirical

Nonlinear oscillations of non-neutral plasmas in a time-dependent harmonic trap

2020 ◽  
Vol 27 (6) ◽  
pp. 062307
Author(s):  
Fernando Haas ◽  
Luiz Gustavo Ferreira Soares
Keyword(s):  
Nonlinear Oscillations ◽  
Harmonic Trap ◽  
Time Dependent

Unified Constitutive Modelling of Nonlinear Time-Dependent Materials

1989 ◽  
Vol 42 (11S) ◽  
pp. S78-S82
Author(s):  
P. G. Glockner ◽  
W. Szyszkowski
Keyword(s):  
Strain Softening ◽  
Strain Tensor ◽  
Damage Function ◽  
Constitutive Modelling ◽  
Constitutive Law ◽  
Time Dependent ◽  
Type Integral ◽  
Characteristic Features ◽  
Stress Dependent ◽  
Semi Empirical

A semi-empirical engineering constitutive law modelling in a unified and continuous manner the main characteristic features of time-dependent materials, including creep, strain softening, relaxation and recovery and tensile brittleness, is briefly reviewed. The model, which contains 13 parameters, is a hereditary single Volterra-type integral representation of material response with stress/strain nonlinearity assumed in the form of a power law, the strain tensor dependent on the entire stress history and the stress-anisotropy/brittleness feature handled by means of a tensile-stress dependent damage function. The capability/versatility of the model is illustrated by examples for several materials.

Models for the Directional Distribution of the Diffuse Sky Radiance

1990 ◽  
Vol 112 (2) ◽  
pp. 102-109 ◽  
Author(s):  
F. M. F. Siala ◽  
M. A. Rosen ◽  
F. C. Hooper
Keyword(s):  
Angular Distribution ◽  
Stochastic Models ◽  
Continuous Distribution ◽  
Time Dependent ◽  
Distribution Models ◽  
Directional Distribution ◽  
Sky Radiance ◽  
Semi Empirical ◽  
Sky Type

Both traditional and recently proposed models for the angular distribution of diffuse sky radiance are reviewed and compared. The models considered include basic models, sky-type-specific models, empirical and semi-empirical continuous distribution models, models which account for time-dependent cloud effects and stochastic models.

scholarly journals An improved semi-empirical model for the densification of Antarctic firn

2011 ◽  
Vol 5 (4) ◽  
pp. 1921-1948 ◽  
Author(s):  
S. R. M. Ligtenberg ◽  
M. M. Helsen ◽  
M. R. van den Broeke
Keyword(s):  
Steady State ◽  
Temporal Evolution ◽  
Time Dependent ◽  
Upward Motion ◽  
Density Profiles ◽  
Steady State Model ◽  
Dependent Model ◽  
Semi Empirical ◽  
The Antarctic ◽  
Time Dependent Model

Abstract. A firn densification model is presented that simulates steady-state Antarctic firn density profiles, as well as the temporal evolution of firn density and surface height. The model uses an improved firn densification expression that is tuned to fit depth-density observations. Liquid water processes (meltwater percolation, retention and refreezing) are also included. Two applications are presented. The steady-state model version is used to simulate the strong spatial variability in firn layer thickness across the Antarctic ice sheet. The time-dependent model is run for 3 Antarctic locations. It reveals a gentle upward motion of the surface during autumn, winter and spring, while during summer there is a more rapid lowering of the surface. Accumulation and (if present) melt introduce large inter-annual variability in surface height trends, possibly hiding ice dynamical thickening and thinning.

Numerical Algorithms for Application to Time-Dependent Problems in Quantum Chemistry

1997 ◽  
Vol 08 (02) ◽  
pp. 123-130
Author(s):  
A. M. Mazzone
Keyword(s):  
Monte Carlo ◽  
Quantum Chemistry ◽  
Ab Initio ◽  
Monte Carlo Methods ◽  
Numerical Algorithms ◽  
Time Dependent ◽  
Quantum Mechanical ◽  
Direct Numerical Integration ◽  
Semi Empirical ◽  
Time Dependent Problems

This study illustrates the application of Monte Carlo methods of quantum mechanical type and of direct numerical integration to the solution of a multi-particle, time-dependent Schrödinger equation of the type used for the evaluation of molecular properties. In this study the algorithms are presented and a comparison is made with ab initio and semi-empirical calculations.

Anomalous Fowler-Nordheim Tunneling through SiO2/4H-SiC Barrier Investigated by Temperature and Time Dependent Gate Current Measurements

2017 ◽  
Vol 897 ◽  
pp. 123-126
Author(s):  
Patrick Fiorenza ◽  
Antonino La Magna ◽  
Marilena Vivona ◽  
Filippo Giannazzo ◽  
Fabrizio Roccaforte
Keyword(s):  
Reverse Bias ◽  
Time Dependent ◽  
Interface Traps ◽  
Post Deposition Annealing ◽  
Gate Current ◽  
A Charge ◽  
Semi Empirical ◽  
Post Deposition ◽  
Nordheim Tunneling ◽  
Charge Discharge

This paper reports on the conduction mechanisms and trapping effects in SiO2/4H-SiC MOS-based devices subjected to post deposition annealing in N2O. In particular, the anomalous Fowler-Nordheim (FN) tunnelling through the SiO2/4H-SiC barrier observed under consecutive reverse bias sweeps was studied by temperature and time dependent gate current measurements. The excess of gate current with respect to the theoretical FN predictions was explained by a charge-discharge mechanism of Near Interface Traps (NITs) in the oxide. The gate current transient was described with a semi-empirical analytical model, modifying the standard FN model with a time-dependent electric field to account for the neutralization of trapped charges at NITs.

Sign in / Sign up

Export Citation Format

Share Document