Results 101 to 110 of about 715 (188)

Method of fundamental solutions based on geodesic distance for in homogeneous inverse heat conduction problems in anisotropic medium(基于测地距离的基本解方法求解非齐次各向异性IHCP问题)

Zhejiang Daxue xuebao. Lixue ban, 2009
提出了一种求解非齐次各向异性热传导方程一类反问题IHCP(inverse heat conduction problem）的无网格方法,该方法通过借助基于测地距离的Multiquadric(MQ）作为基函数得到整个时间空间区域上的一个近似特解,然后用基于测地距离的基本解方法直接在整个时间空间区域上对相应的齐次问题进行求解.用截断奇异值分解(TSVD)法求解所得病态线性方程组,用L-曲线准则确定正则化参数.用数值例子验证了该方法的有效性,并分析了数值解的精度与参数T、c的关系.
WANGJin-yu(王金玉), SUNFang-yu(孙方裕)   +1 more
doaj   +1 more source

Stability of the geodesic flow for the energy [PDF]

, 2002
summary:We study the stability of the geodesic flow $\xi$ as a critical point for the energy functional when the base space is a compact orientable quotient of a two-point homogeneous ...
González-Dávila, J. C., Boeckx, E., Vanhecke, L.   +2 more
core  

Quantification of ground surface movements on sorted circles using time‐lapse structure‐from‐motion photogrammetry in a karst cave, Slovenia

Earth Surface Processes and Landforms, Volume 51, Issue 6, June 2026.
We present ground surface movements on sorted circles in a karst cave using time‐lapse photogrammetry with accuracies of up to ±2 mm. Data with 3‐hourly resolution revealed average vertical movements of up to 50 mm and horizontal movements of up to 15 mm during individual freeze–thaw cycles.
Jaroslav Obu, Matej Blatnik, Julia Boike, Franci Gabrovšek, Luc Girod, Andreas M. Kääb, Norikazu Matsuoka, Paul P. Overduin, Mihaela Triglav Čekada, Marko Zore   +9 more
wiley   +1 more source

Bioclimatic Reorganization of Carbon–Water–Energy Coupling Revealed by Eddy Covariance and Interpretable Machine Learning

Global Change Biology Communications, Volume 1, Issue 2, June 2026.
Ecosystem carbon, water, and energy exchange reorganize systematically along climatic gradients from humid to dry conditions. Tapering shapes indicate shifts in the relative importance of environmental drivers and ecosystem fluxes across climate space, with thicker ends representing greater influence or magnitude.
Koong Yi, Margaret S. Torn, Gabriel B. Senay, Lixin Wang, Kosana Suvočarev, Joshua B. Fisher, Arman Ahmadi, Housen Chu, Gil Bohrer, Georgianne W. Moore, Stephen P. Good, Steven A. Kannenberg, Justine E. C. Missik, Kanishka Mallick, Kul Khand, Youngryel Ryu, Kuno Kasak, A. Christopher Oishi, David E. Reed, Xiangzhong Luo, Carl J. Bernacchi, Dennis D. Baldocchi   +21 more
wiley   +1 more source

Computed Tomography–Based Quantitative Morphometry Reveals Distinct Airway Remodelling in COVID-19 versus Community-Acquired Pneumonia

Journal of Basic and Applied Research in Biomedicine
Purpose: To quantitatively characterize airway structural changes in COVID-19 and compare them to those observed in community-acquired pneumonia (CAP), using computed tomography (CT)-based Morphometry. The study aims to evaluate whether COVID-19 and CAP
Gihad Ibrahim
doaj   +1 more source

Kahler manifolds and their relatives

, 2010
Let M1 and M2 be two K¨ahler manifolds. We call M1 and M2 relatives if they share a non-trivial K¨ahler submanifold S, namely, if there exist two holomorphic and isometric immersions (K¨ahler immersions) h1 : S → M1 and h2 : S → M2. Moreover, two K¨ahler
Loi, A., Di Scala, Antonio Jose'
core  

On the Computation of Tensor Functions under Tensor‐Tensor Multiplications with Linear Maps

Numerical Linear Algebra with Applications, Volume 33, Issue 3, June 2026.
ABSTRACT In this paper, we study the computation of both algebraic and non‐algebraic tensor functions under the tensor‐tensor multiplication with linear maps. In the case of algebraic tensor functions, we prove that the asymptotic exponent of both the tensor‐tensor multiplication and the tensor polynomial evaluation problem under this multiplication is
Jeong‐Hoon Ju, Susana López‐Moreno
wiley   +1 more source

Background Instability of Quintessence Model in Light of Entropy and Distance Conjecture

Fortschritte der Physik, Volume 74, Issue 6, June 2026.
ABSTRACT We apply the covariant entropy bound argument supporting the de Sitter swampland conjecture to the quintessence model, to find out the condition for the background to be unstable. More concretely, the background is unstable when the matter entropy given by the species number of the effective field theory increases more rapidly than the ...
Min‐Seok Seo
wiley   +1 more source

Future geodesic completeness of some spatially homogeneous solutions of the vacuum Einstein equations in higher dimensions

, 2010
It is known that all spatially homogeneous solutions of the vacuum Einstein equations in four dimensions which exist for an infinite proper time towards the future are future geodesically complete.
Goedeke, A., Alan D Rendall, Arne Gödeke, Rendall, A.   +3 more
core   +1 more source

Ringdown Modulation of Acceleration Radiation in the Schwarzschild Background

Fortschritte der Physik, Volume 74, Issue 6, June 2026.
ABSTRACT We derive an analytic first‐order description of how Schwarzschild ringdown affects a detector‐based detailed‐balance diagnostic in a near‐horizon, single‐mode setting. A freely falling two‐level system couples to a cavity‐filtered outgoing mode of fixed asymptotic frequency, whose static Schwarzschild response gives geometric photon ...
Reggie C. Pantig
wiley   +1 more source