Results 31 to 40 of about 5,773 (194)

Generalized Langevin equation for solute dynamics in fluids with time-dependent friction

open access: yesResults in Physics, 2023
The generalized Langevin equation (GLE) for a Brownian particle (BP) in a bath under the influence of a moving external harmonic potential is derived. It is assumed that the friction coefficients of the bath particles depend on time.
Jana Tóthová, Vladimír Lisý
doaj   +1 more source

Load-relaxation properties of the human trunk in response to prolonged flexion: measuring and modeling the effect of flexion angle. [PDF]

open access: yesPLoS ONE, 2012
Experimental studies suggest that prolonged trunk flexion reduces passive support of the spine. To understand alterations of the synergy between active and passive tissues following such loadings, several studies have assessed the time-dependent behavior
Nima Toosizadeh   +3 more
doaj   +1 more source

Instantaneous Modulus Test of Solid Propellant and the Impact on the Structural Integrity of the Charge [PDF]

open access: yesHangkong bingqi
Hydroxyl-terminated polybutadiene (HTPB) propellant is investigated in this study. At three initial tensile strain rates of 100 %/s, 50 %/s and 12 %/s, the propellant relaxation modulus tests are carried out, and the relaxation modulus curves of the ...
Wang Yibo, Tang Qi, Dong Meng, Jiang Pengchen
doaj   +1 more source

Energies of Mechanical Fractional-Order Elements: Causal Concept and Kernel Effects

open access: yesApplied Sciences, 2023
The energies of the classical Maxwell mechanical model of viscoelastic behavior have been studied as a template with a variety of relaxation kernels in light of a causal formulation of the force–displacement relationship.
Jordan Hristov
doaj   +1 more source

Reconstruction of Planar Domains from Partial Integral Measurements [PDF]

open access: yes, 2011
We consider the problem of reconstruction of planar domains from their moments. Specifically, we consider domains with boundary which can be represented by a union of a finite number of pieces whose graphs are solutions of a linear differential equation ...
Batenkov, Dmitry   +2 more
core   +2 more sources

Application of micro-computer tomography and inverse finite element analysis for characterizing the visco-hyperelastic response of bulk liver tissue using indentation

open access: yesSN Applied Sciences, 2021
In-vitro mechanical indentation experimentation is performed on bulk liver tissue of lamb to characterize its nonlinear material behaviour. The material response is characterized by a visco-hyperelastic material model by the use of 2-dimensional inverse ...
Rajeswara R. Resapu, Roger D. Bradshaw
doaj   +1 more source

2-D Prony-Huang Transform: A New Tool for 2-D Spectral Analysis [PDF]

open access: yes, 2014
This work proposes an extension of the 1-D Hilbert Huang transform for the analysis of images. The proposed method consists in (i) adaptively decomposing an image into oscillating parts called intrinsic mode functions (IMFs) using a mode decomposition ...
Borgnat, Pierre   +4 more
core   +2 more sources

Vibration characteristic design of a multi-modal and multi-axis dynamic vibration absorber consists of viscoelastic material containing embedded ball-like mass

open access: yesNihon Kikai Gakkai ronbunshu, 2022
Recently, one of the authors proposed a multi-modal and multi-axis vibration reduction device against elastic vibrations of structures. The device is called eMDVA (embedded Mass Dynamic Vibration Absorber). The eMDVA consists of a ball-like mass embedded
Hikaru ISHIZAWA, Takahiro TOMIOKA
doaj   +1 more source

Wrinkling of Orthotropic Viscoelastic Membranes [PDF]

open access: yes, 2010
This paper presents a simplified simulation technique for orthotropic viscoelastic films. Wrinkling is detected by a combined stress-strain criterion and an iterative scheme searches for the wrinkle angle using a pseudo-elastic material stiffness ...
Deng, X., Pellegrino, S.
core   +1 more source

Numerical Integration of the Extended Variable Generalized Langevin Equation with a Positive Prony Representable Memory Kernel

open access: yes, 2013
Generalized Langevin dynamics (GLD) arise in the modeling of a number of systems, ranging from structured fluids that exhibit a viscoelastic mechanical response, to biological systems, and other media that exhibit anomalous diffusive phenomena. Molecular
Baczewski, Andrew D., Bond, Stephen D.
core   +1 more source

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