Results 51 to 60 of about 387,846 (192)

Releasing scalar fields: cosmological simulations of scalar-tensor theories for gravity beyond the static approximation

open access: yes, 2013
Several extensions of General Relativity and high energy physics include scalar fields as extra degrees of freedom. In the search for predictions in the non-linear regime of cosmological evolution, the community makes use of numerical simulations in ...
Llinares, Claudio, Mota, David
core   +1 more source

Stability and quasi-normal modes of charged black holes in Born-Infeld gravity

open access: yes, 2005
In this paper we study the stability and quasi-normal modes of scalar perturbations of black holes. The static charged black hole considered here is a solution to Born-Infeld electrodynamics coupled to gravity.
A. A. Tseytlin   +38 more
core   +5 more sources

Creep and Fracture in Concrete: A Fractional Order Rate Approach [PDF]

open access: yes, 2002
The paper analyses the interaction between strain-softening and time-dependent behaviour in the case of quasi-static fracture of concrete. A viscous element based on a fractional order rate law is coupled with a micromecanical model for the fracture ...
Barenblatt   +17 more
core   +1 more source

Finite element formulation and analysis of Timoshenko beam excited by transversely fluctuating supports due to a real seismic wave

open access: yesNuclear Engineering and Technology, 2018
Using the concept of quasi-static decomposition and using three-noded isoparametric locking-free element, this article presents a formulation of the finite element method for Timoshenko beam subjected to spatially different time-dependent motions at ...
Yong-Woo Kim, Seung Chan Cha
doaj   +1 more source

Comment on "Optical Response of Strongly Coupled Nanopraticles in Dimer Arrays" (Phys. Rev. B 71(4), 045404, 2005)

open access: yes, 2006
I have re-calculated the extinction spectra of aggregates of two silver nanospheres shown in Figs.~2 and 3 of Ref.~8. I have used the approximate method of images according to Ref.~8 and an exact numerical technique.
D. J. Bergman   +3 more
core   +1 more source

Optimization of Soft Actuator Control in a Continuum Robot

open access: yesActuators
This study presents a quasi-static optimization framework for the pressure-based control of a multi-segment soft continuum manipulator. The proposed method circumvents traditional curvature and length-based modeling by directly identifying the quasi ...
Oleksandr Sokolov   +3 more
doaj   +1 more source

Optimal Methods of RTK-GPS/Accelerometer Integration to Monitor the Displacement of Structures

open access: yesSensors, 2012
The accurate measurement of diverse displacements of structures is an important index for the evaluation of a structure’s safety. In this study, a comparative analysis was conducted to determine the integrated RTK-GPS/accelerometer method that can ...
Sungnam Hong   +4 more
doaj   +1 more source

Studies on the Seismic Design of Low-Rise Steel Buildings [PDF]

open access: yes, 1977
The behavior of low-rise steel shear buildings, moment frame buildings, and X-braced buildings, subjected to earthquake base motion, is studied using inelastic time-history analysis.
Hall, W.J., Montgomery, C.J.
core  

Determination of the Constants of GTN Damage Model Using Experiment, Polynomial Regression and Kriging Methods

open access: yesApplied Sciences, 2017
Damage models, particularly the Gurson–Tvergaard–Needleman (GTN) model, are widely used in numerical simulation of material deformations. Each damage model has some constants which must be identified for each material.
Foad Rahimidehgolan   +3 more
doaj   +1 more source

Effect of Displacement Current on the Finite-Difference Modeling of Natural Source Electromagnetic Diffusion

open access: yesApplied Sciences, 2020
For electromagnetic (EM) modeling based on the electric-field formulation at low frequencies, the quasi-static approximation (i.e., only the conduction current is considered and the displacement current is ignored) is commonly applied, and a small ...
Yahui Xue   +5 more
doaj   +1 more source

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