Results 121 to 130 of about 112,777 (272)
Anais da Academia Brasileira de Ciências, 2002 In this paper we generalize and extend to any Riemannian manifold maximum principles for Euclidean hypersurfaces with vanishing curvature functions obtained by Hounie-Leite.Neste trabalho nós generalizamos e estendemos para uma variedade Riemanniana ...
FRANCISCO X. FONTENELE, SÉRGIO L. SILVA
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Stereodynamism in Chiral Polyaromatic Phosphepines
Chemistry – A European Journal, Volume 31, Issue 34, June 17, 2025.Stereodynamism of phosphahelicenoid scaffolds can be used to afford diastereoisomers of polyaromatics fused with a chiral seven‐membered P‐ring. In particular, a complex interplay between the inversion at the P centre and helicenoid epimerization, as well as a competition with a rearomatization reaction, takes place.
Mengling Lyu +7 more
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Hypersurfaces that are not stably rational [PDF]
Journal of the American Mathematical Society, 2015 We show that a wide class of hypersurfaces in all dimensions are not stably rational. Namely, for all d ≥ 2 ⌈ ( n + 2 ) / 3 ⌉ d\geq 2\lceil (n+2)/3\rceil and n ≥ 3 n\geq 3 , a very general complex ...
openaire +3 more sources
M\"obius and Laguerre geometry of Dupin Hypersurfaces
, 2015 In this paper we show that a Dupin hypersurface with constant M\"{o}bius curvatures is M\"{o}bius equivalent to either an isoparametric hypersurface in the sphere or a cone over an isoparametric hypersurface in a sphere.
Li, Tongzhu, Qing, Jie, Wang, Changping
core
On the order of an automorphism of a smooth hypersurface [PDF]
, 2011 In this paper we give an effective criterion as to when a positive integer q is the order of an automorphism of a smooth hypersurface of dimension n and degree d, for every d ≥ 3, n ≥ 2, (n, d) ≠ (2, 4), and gcd(q, d) = gcd(q, d − 1) = 1.
V. González-Aguilera, Alvaro Liendo
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Embedded positive constant r-mean curvature hypersurfaces in Mm × R
Anais da Academia Brasileira de Ciências, 2005 Let M be an m-dimensional Riemannian manifold with sectional curvature bounded from below. We consider hypersurfaces in the (m + 1)-dimensional product manifold M x R with positive constant r-mean curvature.
Cheng Xu, Rosenberg Harold
doaj
MathematicsIn this article, we investigate Ricci solitons occurring on spacelike hypersurfaces of Einstein Lorentzian manifolds. We give the necessary and sufficient conditions for a spacelike hypersurface of a Lorentzian manifold, equipped with a closed conformal ...
Norah Alshehri, Mohammed Guediri
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Advanced Science, Volume 12, Issue 21, June 5, 2025.Laser ablation in liquid still holds great potential for the synthesis of multicomponent non‐equilibrium nanomaterials. Here, time‐resolved experiments reveal that gas‐evolving additives both have chemical effects and reduce shockwave pressure. This approach offers a strategy to control the atomic structure of the nanoalloys, easily switching from ...
Vito Coviello +8 more
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The Value of Device Characterization for the Optimization of Organic Solar Cells
Advanced Energy Materials, Volume 15, Issue 24, June 24, 2025.Using the example of organic photovoltaics (OPV), this study examines whether and when additional measurements can be helpful in process optimization. A virtual laboratory based on real solar cells serves as a benchmark function to compare two different approaches for process optimization, namely black‐box optimization (black circle) and model‐based ...
Leonard Christen +4 more
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Transactions on Emerging Telecommunications Technologies, Volume 36, Issue 6, June 2025.This paper explicitly reviews the state‐of‐the‐art RIS‐assisted wireless networks, especially open challenges relating to the B5G and 6G networks. This work presents an intensive study of recent research on RIS to provide an in‐depth understanding of the underlying principles surrounding RIS operations, composition, and effect on EM waves.
Chukwuemeka Nwufo +2 more
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