Results 81 to 90 of about 13,144,199 (261)
Regularity of degenerate Hessian equations [PDF]
, 2019 We show a second order a priori estimate for solutions to the complex k-Hessian equation on a compact Kähler manifold provided the (k−1)st root of the right hand side is C1,1. This improves an estimate of Hou-Ma-Wu (Math Res Lett 17:547-561, 2010).
Pliś, Szymon +5 more
core +1 more source
Two Two‐Tier Stochastic Frontier Replications
Journal of Applied Econometrics, EarlyView.ABSTRACT We replicate the two foundational studies which proposed the two‐tier stochastic frontier model, first in the cross‐sectional setting and then for the fixed effects panel data model. We explore matters of software then and now, different mathematical formulations of the likelihood, and alternative current software tools.
Alecos Papadopoulos +1 more
wiley +1 more source
Introducing sapphire: Towards Hybrid Physics-informed, Data-driven Modeling of Galaxy Formation
The Astrophysical JournalSemianalytic models (SAMs) have been treating galaxy populations as dynamical systems for ≳50 yr, but their evolution equations remain poorly constrained. We introduce sapphire , a modular, automatically differentiable, GPU-accelerated SAM written in JAX
Viraj Pandya +20 more
doaj +1 more source
An All‐At‐Once Solver for Visco‐Acoustic Full Waveform Inversion in the Time‐Domain
Mathematical Methods in the Applied Sciences, EarlyView.ABSTRACT Full waveform inversion (FWI) is the cutting‐edge seismic imaging technique used to reconstruct subsurface material properties such as wave velocities, mass density, and attenuation from measurements of reflected wavefields. In this article, we present the first implementation of FWI in the visco‐acoustic regime, based on a new time‐domain all‐
Christian Rheinbay, Andreas Rieder
wiley +1 more source
Local solvability of the $k$-Hessian equations
, 2014 accepted for publication in SCIENCE CHINA MathematicsIn this work, we study the existence of local solutions in $\mathbb{R}^{n}$ to $k$-Hessian equation,for which the nonhomogeneous term $f$ is permitted to change the sign or be non negative; if $f$ is $
Tian, G, Wang, Qi, Xu, C.-J
core
Oikos, EarlyView.Climatic conditions shape phenotypic evolution by driving adaptations that optimise organismal function. Invasive species provide valuable systems to study these processes, as they often encounter novel climatic conditions in their introduced ranges. The European rabbit Oryctolagus cuniculus, native to the Iberian Peninsula, has established populations
Rishab Pillai +11 more
wiley +1 more source
$C^{1, 1}$ Solution of the Dirichlet Problem for Degenerate $k$-Hessian Equations
, 2013 18pages
Xu, Chao-Jiang, Wang, Qi
openaire +4 more sources
Caring with forests: Human and more‐than‐human care in forest occupations in Germany
People and Nature, EarlyView.Abstract Drawing on ongoing ethnographic and participatory action research within forest occupations in Germany, this paper develops the concept of ‘caring with forests’ to theorise the mutual, multidimensional relationships of care that emerge between humans and more‐than‐human beings in environmental protest settings.
Sebastian Garbe
wiley +1 more source
Data‐driven emulation of flow‐dependent background‐error variance in variational data assimilation
Quarterly Journal of the Royal Meteorological Society, EarlyView.A machine‐learning approach is developed to emulate flow‐dependent background‐error variance within a variational data assimilation framework. The method reproduces uncertainty information that would normally require a 50‐member ensemble using only five members, while maintaining comparable observation fit and forecast performance.
Wei Pan +3 more
wiley +1 more source
On polyharmonic regularizations of $k-$Hessian equations: Variational methods
, 2015 This work is devoted to the study of the boundary value problem \begin{eqnarray}\nonumber (-1)^αΔ^αu = (-1)^k S_k[u] + λf, \qquad x &\in& Ω\subset \mathbb{R}^N, \\ \nonumber u = \partial_n u = \partial_n^2 u = \cdots = \partial_n^{α-1} u = 0, \qquad x &\in& \partial Ω, \end{eqnarray} where the $k-$Hessian $S_k[u]$ is the $k^{\mathrm{th}}
openaire +2 more sources