Results 101 to 110 of about 520,948 (231)

Chen’s Ricci inequalities and topological obstructions on null hypersurfaces of a Lorentzian manifold

open access: yesJournal of Inequalities and Applications, 2018
Given a null hypersurface of a Lorentzian manifold, we isometrically immerse a null hypersurface equipped with the Riemannian metric (induced on it by the rigging) into a Riemannian manifold suitably constructed on the Lorentzian manifold.
Karimumuryango Ménédore
doaj   +1 more source

Aquadi-n-butyl(5-methylpyrazine-2-carboxylato)tin(IV) methanol solvate

open access: yesActa Crystallographica Section E, 2008
In the monomeric title compound, [Sn(C4H9)2(C6H5N2O2)2(H2O)]·CH3OH, the Sn atom is seven-coordinate, displaying a distorted pentagonal bipyramidal SnC2N2O3 geometry with the two C atoms in the axial sites. In the crystal structure, intermolecular O&#
Zhongjun Gao
doaj   +1 more source

Poly[(μ3-biphenyl-3,4′-dicarboxylato-κ4O3:O3′:O4′,O4′′)(1H-imidazo[4,5-f][1,10]phenanthroline-κ2N7,N8)manganese(II)]

open access: yesActa Crystallographica Section E, 2010
In the title compound, [Mn(C14H8O4)(C13H8N4)]n, the MnII atom is six-coordinated in a distorted octahedral geometry by four O atoms from three different carboxylate groups and two N atoms from one imidazo[4,5-f][1,10]phenanthroline molecule.
Fu-Ming Wang
doaj   +1 more source

The missing link: Riemann's “Commentatio,” differential geometry and tensor analysis

open access: yesHistoria Mathematica, 1990
AbstractRiemann's Collected Works contains a seldom mentioned paper on heat conduction, written in Latin and unsuccessfully submitted for a prize to the Académie des Sciences in Paris in 1861. This paper has been presented by many, including Riemann's editors, as a contribution to the development of his geometrical ideas, first outlined in his famous ...
Ruth Farwell, Christopher Knee
openaire   +2 more sources

Recovering the polyhedral geometry of fragmentsThe manuscript contains the link to the data

open access: yesMethodsX
Not only is the geometry of rock fragments often well approximated by ideal convex polyhedra having few faces and vertices, but these numbers carry vital geophysical information on the fragmentation process.Despite their significance, the identification ...
János Török, Gábor Domokos
doaj  

Including widespread geometry schemas into Linked Data-based BIM applied to built heritage [PDF]

open access: gold, 2019
Mathias Bonduel   +4 more
openalex   +1 more source

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