Results 81 to 90 of about 125,502 (226)

Many parameter Hoelder perturbation of unbounded operators

, 2009
If $u\mapsto A(u)$ is a $C^{0,\alpha}$-mapping, for $0< \alpha \le 1$, having as values unbounded self-adjoint operators with compact resolvents and common domain of definition, parametrized by $u$ in an (even infinite dimensional) space, then any ...
A. Frölicher, A. Kriegl, Andreas Kriegl, Armin Rainer, C.-A. Faure, C.-A. Faure, H. Weyl, J. Boman, J. Dieudonné, Peter W. Michor, R. Bhatia   +10 more
core   +1 more source

Linear Toroidal‐Inertial Waves on A Differentially Rotating Sphere with Application to Helioseismology: Modeling, Forward and Inverse Problems

Mathematical Methods in the Applied Sciences, EarlyView.
ABSTRACT This paper develops a mathematical framework for interpreting observations of solar inertial waves in an idealized setting. Under the assumption of purely toroidal linear waves on the sphere, the stream function of the flow satisfies a fourth‐order scalar equation.
Tram Thi Ngoc Nguyen, Damien Fournier, Laurent Gizon, Thorsten Hohage   +3 more
wiley   +1 more source

Neural network with signal parameters featuring for near‐surface velocity model building

Near Surface Geophysics, EarlyView.
Abstract This study presents a method that integrates spectral recomposition (SR) with a neural network to improve near‐surface seismic analysis. The approach incorporates SR‐derived wavelet‐timing attributes into a fully convolutional network (FCN) to enhance the characterization of shallow subsurface structures. Field evaluation was conducted using S‐
Nelson Ricardo Coelho Flores Zuniga
wiley   +1 more source

Double adjoints of Hammerstein functionals defined on continuous functions [PDF]

Annali di Matematica Pura ed Applicata, 1980
One of the main reasons for studying Hammerstein operators is their possible application to the analytic study of nonlinear differential equations. In fact, the kernel ϕ used to represent such operators has properties similar to ones that insure the existence of solutions to equations of the form\(\dot x\)(t)=ϕ(x(t), t) or\(\dot x\)(t)= ϕ(x(t)).
de Korvin, Andre, Roberts, Charles E. jun.   +1 more
openaire   +1 more source

Quasi-spectral decomposition of the heat potential

Electronic Journal of Differential Equations, 2016
In this article, by multiplying of the unitary operator $$ (Pf)(x,t)=f(x,T-t),\quad 0\leq t\leq T, $$ the heat potential turns into a self-adjoint operator.
Tynysbek Sh. Kal'menov, Gaukhar D. Arepova   +1 more
doaj  

Selfadjointness and Positiveness of the Differential Operators Generated by New Type Sturm-Liouville Problems

Cumhuriyet Science Journal, 2019
It is purpose of this paper to investigateSturm-Liouville equation on many-interval with the eigenvalue parameter appearing linearly in theboundary conditions and with two supplementary transmission conditions.
Hayati Olğar
doaj   +1 more source

A pilot variational coupled reanalysis based on the CESAM climate model

Quarterly Journal of the Royal Meteorological Society, EarlyView.
Variational data assimilation of in‐situ and satellite ocean data and reanalysis atmospheric data into an intermediate complexity Earth system model is possible by adjusting the surface fluxes and internal model parameters. This pilot application requires nearly complete information on the atmospheric state for synchronization.
Armin Köhl, Iuliia Polkova, Guokun Lyu, Frank Lunkeit, Abhirup Banerjee, Silke Schubert, Detlef Stammer   +6 more
wiley   +1 more source

SU(3) Gauge Theory with Adjoint Fermions

, 1998
We analyze the finite temperature phase diagram of QCD with fermions in the adjoint representation. The simulations performed with four dynamical Majorana fermions, which is equivalent to two Dirac fermions, show that the deconfinement and chiral phase ...
Boyd, Engels, F. Karsch, Iwasaki, Kogut, Kogut, M. Lütgemeier, Peskin, Shuryak   +8 more
core   +2 more sources

Operational all‐sky assimilation of geostationary infrared water‐vapour channels in the regional ICON‐D2 model with an ensemble Kalman filter

Quarterly Journal of the Royal Meteorological Society, EarlyView.
Though many studies have shown potential benefit in assimilating all‐sky infrared radiances from geostationary satellites, at numerical weather prediction centres it is still common practice to assimilate clear‐sky radiances. We present the operationalization of the all‐sky assimilation of the spinning enhanced visible and infrared imager (SEVIRI ...
Annika Schomburg, Christoph Schraff, Christina Köpken‐Watts, Klaus Stephan, Liselotte Schühl, Robin Faulwetter   +5 more
wiley   +1 more source

Continuous Adjoint to Proudman's Formula for Aeroacoustic Shape Optimization

International Journal for Numerical Methods in Fluids
ABSTRACTThis paper presents an approach for aeroacoustic optimization through the reduction of acoustic sources, based on the integration of Proudman's formula into a continuous adjoint framework coupled with the Reynolds‐averaged Navier–Stokes equations, for the first‐time. The development includes the adjoint to the turbulence model.
M. Erfan Farhikhteh, E. M. Papoutsis Kiachagias, K. C. Giannakoglou   +2 more
openaire   +2 more sources