Results 31 to 40 of about 7,729 (158)

Stability Analysis of Nondifferentiable Systems

Studies in Applied Mathematics, Volume 154, Issue 1, January 2025.
ABSTRACT Differential equations with right‐hand side functions that are not everywhere differentiable are referred to as nondifferentiable systems. This paper introduces three novel methods to address stability issues in nondifferentiable systems.
Jiwoon Sim, Tianxu Wang, Hao Wang
wiley   +1 more source

The second Yamabe invariant with boundary

Advances in Nonlinear Analysis
Let (M,∂M,g)\left(M,\partial M,g) be a compact Riemannian manifold with boundary. As a generalization of the Yamabe invariant with boundary Y(M,∂M,g)Y\left(M,\partial M,g), we define the kth Yamabe invariant with boundary Yk(M,∂M,g){Y}_{k}\left(M ...
Ho Pak Tung, Pyo Juncheol
doaj   +1 more source

Successful Treatment With Evocalcet Against Familial Hypocalciuric Hypercalcemia Type 3 (FHH3) Identified by AP2S1 Gene Mutation (p.Arg15Leu)

Case Reports in Endocrinology, Volume 2025, Issue 1, 2025.
Background: Familial hypocalciuric hypercalcemia type 3 (FHH3) is a rare hereditary disorder caused by a heterozygous AP2S1 gene mutation, characterized by hypocalciuria and hypercalcemia due to impaired intracellular signal transduction of calcium (Ca)‐sensing receptors (CaSRs).
Ai Chida, Yutaka Hasegawa, Toshie Segawa, Daisuke Yamabe, Hirotaka Yan, Yusuke Chiba, Hiraku Chiba, Hirofumi Kinno, Tomoyasu Oda, Yoshihiko Takahashi, Koji Nata, Yasushi Ishigaki, Toshihiro Kita   +12 more
wiley   +1 more source

Comprehensive Safety Assessment of Hydrogen: From Production to Application in Energy Systems

International Journal of Energy Research, Volume 2025, Issue 1, 2025.
In the quest for sustainable and clean energy alternatives to fossil fuels, hydrogen emerges as a front‐runner due to its high energy yield and environmentally friendly combustion byproduct, water. This study delves into the comprehensive lifecycle of hydrogen energy, from its production through various methods, storage, and transportation, to its ...
Ahmed Nazmus Sakib, Tashfiqul Islam, Philip M. Resnick, A. K. M. Ahsanul Habib, Sadikur Rahman Chowdhury, Denis Osinkin   +5 more
wiley   +1 more source

2‐Conformal Vector Fields on the Model Sol Space and Hyperbolic Ricci Solitons

Journal of Mathematics, Volume 2025, Issue 1, 2025.
In this study, we present the notion of 2‐conformal vector fields on Riemannian and semi‐Riemannian manifolds, which are an extension of Killing and conformal vector fields. Next, we provide suitable vector fields in Sol space that are 2‐conformal. A few implications of 2‐conformal vector fields in hyperbolic Ricci solitons are investigated.
Rawan Bossly, Ghodratallah Fasihi-Ramandi, Mohd Danish Siddiqi, Antonio Masiello   +3 more
wiley   +1 more source

Conformally invariant random fields, Liouville quantum gravity measures, and random Paneitz operators on Riemannian manifolds of even dimension

Journal of the London Mathematical Society, Volume 110, Issue 5, November 2024.
Abstract For large classes of even‐dimensional Riemannian manifolds (M,g)$(M,g)$, we construct and analyze conformally invariant random fields. These centered Gaussian fields h=hg$h=h_g$, called co‐polyharmonic Gaussian fields, are characterized by their covariance kernels k which exhibit a precise logarithmic divergence: |k(x,y)−log1d(x,y)|≤C$\big ...
Lorenzo Dello Schiavo, Ronan Herry, Eva Kopfer, Karl‐Theodor Sturm   +3 more
wiley   +1 more source

A factorization of the GJMS operators of special Einstein products and applications

Journal of the London Mathematical Society, Volume 110, Issue 5, November 2024.
Abstract We show that the GJMS operators of a special Einstein product factor as a composition of second‐ and fourth‐order differential operators. In particular, our formula applies to the Riemannian product Hℓ×Sd−ℓ$H^{\ell } \times S^{d-\ell }$. We also show that there is an integer D=D(k,ℓ)$D = D(k,\ell)$ such that if d⩾D$d \geqslant D$, then for any
Jeffrey S. Case, Andrea Malchiodi
wiley   +1 more source

SVT quest: The adventure diagnosing narrow QRS tachycardia

Journal of Arrhythmia, Volume 40, Issue 4, Page 767-785, August 2024.
The SVT mechanism includes atrial tachycardia (AT), orthodromic reciprocating tachycardia (ORT) via an atrioventricular accessory pathway (AP), nodoventricular pathway (NVP), nodofascicular pathway (NFP) or His‐ventricular pathway, and atrioventricular nodal reentrant tachycardia (AVNRT).
Koichi Nagashima, Gregory F. Michaud, Reginald T. Ho, Yasuo Okumura   +3 more
wiley   +1 more source

A note on extremal functions for sharp Sobolev inequalities

Electronic Journal of Differential Equations, 2007
In this note we prove that any compact Riemannian manifold of dimension $ngeq 4$ which is non-conformal to the standard n-sphere and has positive Yamabe invariant admits infinitely many conformal metrics with nonconstant positive scalar curvature on
Marcos Montenegro, Ezequiel R. Barbosa
doaj  

Solving the Yamabe Problem by an Iterative Method on a Small Riemannian Domain [PDF]

, 2021
Steven Rosenberg, Jie Xu
openalex   +1 more source