Results 31 to 40 of about 1,470 (219)

Null Controllability for Parabolic Operators with Interior Degeneracy and One-Sided Control

SIAM Journal on Control and Optimization, 2019
For $ \in (0,2)$ we study the null controllability of the parabolic operator $$Pu= u_t - (\vert x \vert ^ u_x)_x\qquad ...
Cannarsa P., Ferretti R., Martinez P.
openaire   +5 more sources

Null controllability for a coupled system of degenerate/singular parabolic equations in nondivergence form

Electronic Journal of Qualitative Theory of Differential Equations, 2018
We deal with a control problem for a coupled system of two degenerate singular parabolic equations in non-divergence form with degeneracy and singularity appearing at an interior point of the space domain. In particular, we consider the well-posedness of
Jawad Salhi
doaj   +1 more source

Isotropic compact stars in four-dimensional Einstein–Gauss–Bonnet gravity coupled with scalar field: reconstruction of model

European Physical Journal C: Particles and Fields, 2023
It has been suggested that the Einstein–Gauss–Bonnet theory coupled with a scalar field (EGBS) may allow us to obtain physically viable models of celestial phenomena such that the scalar field effect is active in standard four dimensions. We consider the
G. G. L. Nashed, Shin’ichi Nojiri
doaj   +1 more source

On the weakly degenerate Allen-Cahn equation

Advances in Nonlinear Analysis, 2019
In this paper we consider a one-dimensional Allen-Cahn equation with degeneracy in the interior of the domain and Neumann boundary conditions. We allow the diffusivity coefficient vanish at some point of the space domain and we are addressed on the ...
Sônego Maicon
doaj   +1 more source

Classify and Explore the Diversity of Planetary Population and Interior Properties

The Astrophysical Journal, 2023
Classification is an essential method and has been developed widely in astronomy. However, planets still lack a universal classification framework, because the solar system planet sample is too small for statistical analysis.
Xiaoming Jiang, Jonathan H. Jiang, Remo Burn, Zong-Hong Zhu   +3 more
doaj   +1 more source

Schemes Convergent ε-Uniformly for Parabolic Singularly Perturbed Problems with a Degenerating Convective Term and a Discontinuous Source

Mathematical Modelling and Analysis, 2015
We consider the numerical approximation of a 1D singularly perturbed convection-diffusion problem with a multiply degenerating convective term, for which the order of degeneracy is 2p + 1, p is an integer with p ≥ 1, and such that the convective flux is ...
Carmelo Clavero, Jose Luis Gracia, Grigorii I. Shishkin, Lidia P. Shishkina   +3 more
doaj   +1 more source

Emergent classical spacetime from microstates of an incipient black hole

Journal of High Energy Physics, 2019
Black holes have an enormous underlying space of microstates, but universal macroscopic physics characterized by mass, charge and angular momentum as well as a causally disconnected interior.
Vijay Balasubramanian, David Berenstein, Aitor Lewkowycz, Alexandra Miller, Onkar Parrikar, Charles Rabideau   +5 more
doaj   +1 more source

Variational inequalities with lack of ellipticity. Part I: Optimal interior regularity and non-degeneracy of the free boundary [PDF]

Indiana University Mathematics Journal, 2003
This paper deals with obstacle problems for sub-Laplacians on Carnot groups and it provides the sub-elliptic extension of regularity for solutions of variational inequalities associated with uniformly elliptic second order operators (see e.g. the classical works of G. Stampacchia, H. Lewy, J. L. Lions, J. Frehse, L. A. Caffarelli, D.
D. Danielli, N. Garofalo, SALSA, SANDRO
openaire   +3 more sources

Dimethyl Fumarate, But Not Rituximab, Reduces Serum GFAP Levels and PIRMA in Relapsing–Remitting MS

Annals of Clinical and Translational Neurology, EarlyView.
ABSTRACT Objective Serum neurofilament light chain (sNfL) and glial fibrillary acidic protein (sGFAP) levels are believed to reflect mainly acute and chronic disease processes in multiple sclerosis (MS), respectively. In this study, we investigated whether dimethyl fumarate (DMF) and rituximab (RTX) differentially affect these biomarkers.
F. Shawket, J. Lycke, J. Salzer, F. Piehl, K. Fink, N. Lange, J. Mellergård, C. Malmeström, P. Sundström, I. Erngren, A. al‐Grety, E. Freyhult, K. Kultima, J. Burman, A. Svenningsson   +14 more
wiley   +1 more source

Application of Raman and Photoluminescence Spectroscopy to MgO‐C Refractories

Advanced Engineering Materials, EarlyView.
Visible to near infrared luminescence of MgO is studied on MgO‐C bricks and nominally pure MgO powder, with focus on two similar sharp high‐intensity signals, at 699 and 871 nm, each surrounded by symmetrical sidebands. The nature of these sidebands is investigated by temperature‐dependent spectroscopic measurements, confirming phonon involvement by ...
Julia Richter, Felix Drechsler, Till M. J. Stadtmüller, Cameliu Himcinschi, Christos G. Aneziris, Jens Kortus   +5 more
wiley   +1 more source