Results 11 to 20 of about 2,094,916 (148)

Closed Form Solution in the Buckling Optimization Problem of Twisted Shafts

open access: yesApplied Mechanics, 2023
The counterpart for Euler’s buckling problem is Greenhill’s problem, which studies the forming of a loop in an elastic beam under torsion. In the context of twisted shafts, the optimal shape of the beam along its axis is searched.
Vladimir Kobelev
doaj   +2 more sources

A Short Note on a Mus-Cheeger-Gromoll Type Metric

open access: yesJournal of New Theory, 2023
In this paper, we first show that the complete lift $U^{c}$ to $TM$ of a vector field $U$ on $M$ is an infinitesimal fiber-preserving conformal transformation if and only if $U$ is an infinitesimal homothetic transformation of $(M,g)$.
Murat Altunbaş
doaj   +2 more sources

Activation of Students in Homothetic Transformation

open access: green, 2020
Nurlan Tashimov   +2 more
openalex   +3 more sources

Green Investment Changes in China: A Shift-Share Analysis. [PDF]

open access: yesInt J Environ Res Public Health, 2021
As China’s economic development has entered a new phase, China needs to seek a new path of green transformation development to coordinate the economic growth with environmental mitigation.
Sheng R, Zhou R, Zhang Y, Wang Z.
europepmc   +2 more sources

The Maxwell Lagrangian in purely affine gravity [PDF]

open access: yes, 2008
The purely affine Lagrangian for linear electrodynamics, that has the form of the Maxwell Lagrangian in which the metric tensor is replaced by the symmetrized Ricci tensor and the electromagnetic field tensor by the tensor of homothetic curvature, is ...
Eddington A. S.   +10 more
core   +1 more source

Morphological diversity of saber-tooth upper canines and its functional implications. [PDF]

open access: yesAnat Rec (Hoboken)
Abstract Elongated upper canine teeth, commonly known as saber‐teeth, have evolved three times within the sub‐order Feliformia. The species that wielded them flourished throughout the Cenozoic and have historically been separated into two morphological groups: the dirk‐tooths with longer, flatter canines, and the scimitar‐tooths with shorter, serrated ...
Shelbourne CD, Lautenschlager S.
europepmc   +2 more sources

Spherically Symmetric, Self-Similar Spacetimes [PDF]

open access: yes, 2001
Self-similar spacetimes are of importance to cosmology and to gravitational collapse problems. We show that self-similarity or the existence of a homothetic Killing vector field for spherically symmetric spacetimes implies the separability of the ...
A. Ori   +7 more
core   +2 more sources

Super parallel immersions in Euclidean space

open access: yesInternational Journal of Mathematics and Mathematical Sciences, 2002
Two submanifolds of Euclidean n-space En are called super parallel if the affine normal spaces are homothetic at the corresponding points. Characterizations are given for the action of conformal transformation on super parallel mates.
Tarek Fathy Mersal   +1 more
doaj   +1 more source

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