Results 11 to 20 of about 1,310,010 (183)

Modeling of micro flows using perturbation method [PDF]

open access: yes, 2011
This paper was presented at the 3rd Micro and Nano Flows Conference (MNF2011), which was held at the Makedonia Palace Hotel, Thessaloniki in Greece.
Shirani, E   +4 more
core   +6 more sources

Applications of cosmological perturbation theory [PDF]

open access: yes, 2011
PhDCosmological perturbation theory is crucial for our understanding of the universe. The linear theory has been well understood for some time, however developing and applying the theory beyond linear order is currently at the forefront of research in
Christopherson, Adam J.
core   +4 more sources

Logarithmic speeds for one-dimensional perturbed random walk in random environment [PDF]

open access: yes, 2007
We study the random walk in random environment on Z+ = f0; 1; 2; : : :g, where the environment is subject to a vanishing (random) perturbation. The two particular cases that we consider are: (i) random walk in random environment perturbed from Sinai's ...
Menshikov, MV   +7 more
core   +4 more sources

Accuracy of microwave cavity perturbation measurements. [PDF]

open access: yes, 2001
Techniques based on the perturbation of cavity resonators are commonly used to measure the permittivity and permeability of samples of dielectric and ferrite materials at microwave frequencies.
Carter, Richard G.
core   +4 more sources

Hille–Nehari type criteria and conditionally oscillatory half-linear differential equations

open access: yesElectronic Journal of Qualitative Theory of Differential Equations, 2019
We study perturbations of the generalized conditionally oscillatory half-linear equation of the Riemann–Weber type. We formulate new oscillation and nonoscillation criteria for this equation and find a perturbation such that the perturbed Riemann–Weber ...
Simona Fišnarová, Zuzana Pátíková
doaj   +1 more source

Perturbed generalized half-linear Riemann–Weber equation – further oscillation results

open access: yesElectronic Journal of Qualitative Theory of Differential Equations, 2017
We establish new oscillation and nonoscillation criteria for the perturbed generalized Riemann–Weber half-linear equation with critical coefficients \begin{equation*} (\Phi(x'))'+\left(\frac{\gamma_p}{t^p}+\sum_{j=1}^n\frac{\mu_p}{t^p\mbox{Log}_j^2 t ...
Simona Fišnarová, Zuzana Pátíková
doaj   +1 more source

Perturbatıon Solution for a Cracked Euler-Bernoulli Beam

open access: yesSakarya Üniversitesi Fen Bilimleri Enstitüsü Dergisi, 2022
The natural frequencies and mode shapes of an Euler-Bernoulli beam with a rectangular cross- section, which has a surface crack, is investigated. The crack is modeled as a change (sudden or gradual) in the cross-section of the beam, and a modified ...
Lütfi Emir Sakman
doaj   +1 more source

Constraints on General Relativity Geodesics by a Covariant Geometric Uncertainty Principle

open access: yesPhysics, 2021
The classical uncertainty principle inequalities are imposed over the general relativity geodesic equation as a mathematical constraint. In this way, the uncertainty principle is reformulated in terms of proper space–time length element, Planck length ...
David Escors, Grazyna Kochan
doaj   +1 more source

Sectorial perturbation of vortex beams: Shannon entropy, orbital angular momentum and topological charge [PDF]

open access: yesКомпьютерная оптика, 2019
Transformations of the vortex beams structure subjected to sectorial perturbation were theoretically and experimentally studied. The analysis was based on computing (measuring) the vortex spectrum that enables us to find the orbital angular momentum (OAM)
Alexander Volyar   +4 more
doaj   +1 more source

PERTURBATION THEORY FOR ELECTROMAGNETIC WAVE SCATTERING IN RANDOM LAYERED STRUCTURES [PDF]

open access: yes, 2010
The problem of electromagnetic wave scattering in 3-D random layered structures, is analytical treated by relying on original results of the Boundary Perturbation Theory (BPT) and Volumetric-Perturbative Reciprocal Theory (VPRT), whose structured ...
Imperatore, Pasquale
core   +1 more source

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