Results 91 to 100 of about 96,126 (203)

Surfaces of Constant Curvature in the Pseudo-Galilean Space

International Journal of Mathematics and Mathematical Sciences, 2012
We develop the local theory of surfaces immersed in the pseudo-Galilean space, a special type of Cayley-Klein spaces. We define principal, Gaussian, and mean curvatures.
Željka Milin Šipuš, Blaženka Divjak
doaj   +1 more source

Functional traits explain growth response to successive hotter droughts across a wide set of common and future tree species in Europe

Plant Biology, Volume 28, Issue 3, Page 827-845, April 2026.
Functional traits can explain significant tree growth reductions in response to the 2018–2020 drought for a wide set of 71 species including angiosperms and gymnosperms. Moreover, four distinct response types emerged: ‘Sufferer’, ‘Late sufferer’, ‘Recoverer’ and ‘Resister’, with gymnosperms predominately appearing as ‘Sufferer’ and ‘Late sufferer ...
L. Kretz, F. Schnabel, R. Richter, A. Raabgrund, J. Kattge, K. Andraczek, A. Kahl, T. Künne, C. Wirth   +8 more
wiley   +1 more source

Efficient high-order finite difference methods for nonlinear Klein–Gordon equations. I: Variants of the phi-four model and the form-I of the nonlinear Klein–Gordon equation

Nonlinear Analysis, 2015
In this paper, the problem of solving some nonlinear Klein–Gordon equations (KGEs) is considered. Here, we derive different fourth- and sixth-order explicit and implicit algorithms to solve the phi-four equation and the form-I of the nonlinear Klein ...
Ascensión Hernández Encinas, Jesus Martín-Vaquero, Araceli Queiruga-Dios, Víctor Gayoso-Martínez   +3 more
doaj   +1 more source

Asymptotic completeness for superradiant Klein-Gordon equations and applications to the De Sitter Kerr metric [PDF]

, 2014
We show asymptotic completeness for a class of superradiant Klein-Gordon equations. Our results are applied to the Klein-Gordon equation on the De Sitter Kerr metric with small angular momentum of the black hole.
Georgescu, Vladimir, Gérard, Christian, Häfner, Dietrich   +2 more
core   +1 more source

Surface Observations From Atmospheric Radiation Measurement Sites Constrain the Anthropogenic Contribution to Cloud Droplet Number

Geophysical Research Letters, Volume 53, Issue 5, 16 March 2026.
Abstract Uncertainty in anthropogenic forcing driven by aerosol‐cloud interactions (aci) limits our ability to infer the sensitivity of the Earth system to forcing from historical records. The driver of aci is the change in cloud droplet number concentration (Nd) due to changes in aerosol serving as cloud condensation nuclei (CCN).
Dani B. Jones, Hunter Y. Brown, Jacqueline M. Nugent, August Mikkelsen, Ci Song, Damao Zhang, Susannah M. Burrows, Hamish Gordon, Andrew Kirby, Daniel T. McCoy   +9 more
wiley   +1 more source

A Lagrangian for mass dimension one fermionic dark matter

Physics Letters B, 2016
The mass dimension one fermionic field associated with Elko satisfies the Klein–Gordon but not the Dirac equation. However, its propagator is not a Green's function of the Klein–Gordon operator.
Cheng-Yang Lee
doaj   +1 more source

Smooth Solutions and Discrete Imaginary Mass of the Klein-Gordon Equation in the de Sitter Background [PDF]

, 2011
Using methods in the theory of semisimple Lie algebras, we can obtain all smooth solutions of the Klein-Gordon equation on the 4-dimensional de Sitter spacetime (dS^4).
Zhou, Bin, Zhou, Zhen-Hua
core  

C∞‐Structures for Liénard Equations and New Exact Solutions to a Class of Klein–Gordon Equations

Mathematical Methods in the Applied Sciences, Volume 49, Issue 4, Page 2795-2822, 15 March 2026.
ABSTRACT Liénard equations are analyzed using the recent theory of 𝒞∞‐structures. For each Liénard equation, a 𝒞∞‐structure is determined by using a Lie point symmetry and a 𝒞∞‐symmetry. Based on this approach, a novel method for integrating these equations is proposed, which consists in solving sequentially two completely integrable Pfaffian equations.
Beltrán de la Flor, Adrián Ruiz, Concepción Muriel   +2 more
wiley   +1 more source

Classical and Quantum Description of the Kapitza-Dirac Effect [PDF]

EPJ Web of Conferences
In this work we explore the classical and quantum descriptions of the Kapitza-Dirac effect, the scattering of charged particles by a standing wave electromagnetic field.
Banu Darius-Matei, Radu Richard-Andrei, Boca Madalina   +2 more
doaj   +1 more source

𝐿² asymptotes for the Klein-Gordon equation [PDF]

Proceedings of the American Mathematical Society, 1971
An approximation a ( x , t ) a(x,t) is obtained for solutions u ( x , t ) u(x,t) of the Klein-Gordon equation. a ( x , t ) a(x,t) can be expressed in terms of the Fourier ...
openaire   +2 more sources