Results 21 to 30 of about 1,087,957 (214)

Reversing orientation homeomorphisms of surfaces

open access: yesPracì Mìžnarodnogo Geometričnogo Centru, 2021
Let $M$ be a connected compact orientable surface, $f:M\to \mathbb{R}$ be a Morse function, and $h:M\to M$ be a diffeomorphism which preserves $f$ in the sense that $f\circ h = f$. We will show that if $h$ leaves invariant each regular component of each
Iryna Kuznietsova, Sergiy Maksymenko
doaj   +1 more source

Covariant singularities in quantum field theory and quantum gravity

open access: yesNuclear Physics B, 2021
It is rather well-known that spacetime singularities are not covariant under field redefinitions. A manifestly covariant approach to singularities in classical gravity was proposed in [1].
Roberto Casadio   +2 more
doaj   +1 more source

Dynamic consequences of nonlinear radiative heat flux and heat generation/absorption effects in cross-diffusion flow of generalized micropolar nanofluid

open access: yesCase Studies in Thermal Engineering, 2021
The double diffusion thermal mechanism of viscoelastic nano-materials has been suggested under the dynamic consequence of nonlinear thermal radiation and temperature absorption/production phenomenon.
M. Ijaz Khan   +6 more
doaj   +1 more source

Analytical solution for the motion of a pendulum with rolling wheel: stability analysis

open access: yesScientific Reports, 2022
The current work focuses on the motion of a simple pendulum connected to a wheel and a lightweight spring. The fundamental equation of motion is transformed into a complicated nonlinear ordinary differential equation under restricted surroundings.
Galal M. Moatimid, T. S. Amer
doaj   +1 more source

Topological Nambu monopole in two Higgs doublet models

open access: yesPhysics Letters B, 2020
We show that a topological Nambu monopole exists as a regular solution for a large range of parameters in two Higgs doublet models, contrary to the standard model admitting only non-topological Nambu monopoles.
Minoru Eto   +3 more
doaj   +1 more source

Non-linear convective flow of the thin film nanofluid over an inclined stretching surface

open access: yesScientific Reports, 2021
To enhance the surface properties of solids the mechanism of thin films is frequently used. Penetration, degradation, stiffness, illumination, diffusion, absorption, and electric performance are all characteristics of a bulk substance medium that a thin ...
Anwar Saeed   +4 more
doaj   +1 more source

The smooth Whitehead spectrum of a point at odd regular primes [PDF]

open access: yes, 2003
Let p be an odd regular prime, and assume that the Lichtenbaum-Quillen conjecture holds for K(Z[1/p]) at p. Then the p-primary homotopy type of the smooth Whitehead spectrum Wh(*) is described.
Adams   +32 more
core   +5 more sources

The K-theory of toric varieties in positive characteristic [PDF]

open access: yes, 2012
We show that if X is a toric scheme over a regular ring containing a field then the direct limit of the K-groups of X taken over any infinite sequence of nontrivial dilations is homotopy invariant. This theorem was known in characteristic 0.
Cortiñas, Guillermo   +3 more
core   +3 more sources

Approximate Analytical Solutions of the Regularized Long Wave Equation Using the Optimal Homotopy Perturbation Method

open access: yesThe Scientific World Journal, 2014
The paper presents the optimal homotopy perturbation method, which is a new method to find approximate analytical solutions for nonlinear partial differential equations.
Constantin Bota, Bogdan Căruntu
doaj   +1 more source

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