Results 41 to 50 of about 8,183 (128)

A Fitted Linear Multistep Approach for Singularly Perturbed Parabolic‐Type Reaction–Diffusion Problems Using Shishkin Meshes

International Journal of Mathematics and Mathematical Sciences, Volume 2025, Issue 1, 2025.
This paper presents a class of singularly perturbed parabolic‐type reaction diffusion problems. Due to the presence of a small parameter ε, (0 < ε ≪ 1) as a diffusion coefficient, the proposed problem exhibits twin boundary layers in the neighborhood of the end points of the spatial domain near x = 0 and x = 1.
Amare Worku Demsie, Awoke Andargie Tiruneh, Endalew Getnet Tsega, Theodore Simos   +3 more
wiley   +1 more source

Structure of 5-nitro-2-tosylaminobenzaldehyde di(morpholin-4-yl)aminal Complex with Carbon Tetrachloride [PDF]

, 1998
The 5-nitro-2-tosylaminobenzaldehyde di(morpholin-4-yl)aminal forms a stable complex with carbon tetrachloride in the crystal phase. X-ray structural study of this complex indicates an essentially shortened intermolecular contact of 2.89 Å between the ...
Gribanova, T. N., Khrustalev, V. N., Lindeman, Sergey V., Orlova, G. I., Shishkin, O. V., Ukhin, L. Yu   +5 more
core   +1 more source

Particle Creation in a universe filled by radiation and dust-like matter

, 1993
In this article the particle creation process of scalar and spin 1/2 particles in a spatially open cosmological model associated with a universe filled by radiation and dustlike matter.
Villalba, Victor M.
core   +1 more source

Fitted Operator Method for Singularly Perturbed Delay Parabolic Problems With Boundary Turning Points

International Journal of Mathematics and Mathematical Sciences, Volume 2025, Issue 1, 2025.
In this paper, a numerical scheme for time‐delay singularly perturbed parabolic convection‐diffusion problems with boundary turning points is presented. The solution of the problem shows a steep gradient or rapid variation at the left region of the spatial domain as the perturbation parameter approaches zero.
Yimesgen Mehari Kebede, Awoke Andargie Tiruneh, Endalew Getnet Tsega, Nian-Sheng Tang   +3 more
wiley   +1 more source

Hybrid Fitted Mesh Strategy for Singularly Perturbed Time‐Dependent Convection‐Diffusion Problems Featuring Boundary Turning Points

International Journal of Mathematics and Mathematical Sciences, Volume 2025, Issue 1, 2025.
This work investigates the solution of convection‐diffusion parabolic partial‐differential problems with boundary turning points that are singularly perturbed. These types of problems are stiff for the following reason: the small parameter multiplying coefficient of the diffusion term and the presence of boundary turning points.
Yimesgen Mehari Kebede, Awoke Andargie Tiruneh, Endalew Getnet Tsega, Mohamed A. Eltaher   +3 more
wiley   +1 more source

RUSSIAN PAINTING IN THE SECOND HALF OF THE XIX CENTURY IN THE WEST EUROPEAN AND NATIVE CRITICISM

Концепт: философия, религия, культура, 2017
Analyzing the mainstream of the Russian realistic painting of the second half of the 19th century reflected in the West European press, which covered Russian artists' participation in World Fairs in London (1862; 1872), Vienna (1873) and Paris (1878 ...
E. G. Meshcherina
doaj  

Dirac spinor in a nonstationary Godel-type cosmological Universe

, 1993
In the present article we solve, via separation of variables, the massless Dirac equation in a nonstationary rotating, causal G\"odel-type cosmological universe, having a constant rotational speed in all the points of the space.
Centro De Física, Víctor M. Villalba
core   +2 more sources

A Uniformly Convergent Scheme for Singularly Perturbed Unsteady Reaction–Diffusion Problems

Journal of Applied Mathematics, Volume 2025, Issue 1, 2025.
In the present work, a class of singularly perturbed unsteady reaction–diffusion problem is considered. With the existence of a small parameter ε, (0 < ε ≪ 1) as a coefficient of the diffusion term in the proposed model problem, there exist twin boundary layer regions near the left end point x = 0 and right end point x = 1 of the spatial domain.
Amare Worku Demsie, Awoke Andargie Tiruneh, Endalew Getnet Tsega, Tudor Barbu   +3 more
wiley   +1 more source

Results of the first Russian survey of retinologists “SETCHAtochkaRU”

Российский офтальмологический журнал
Disorders of the posterior segment of the eye are traditionally one of the most important medical and social problem. The rapid development in the ophthalmology field in the 20th and 21st centuries has led to a significant improvement in the knowledge on
E. V. Bobykin, R. R. Fayzrakhmanov, S. Yu. Golubev, T. I. Dibaev, O. V. Zaytseva, V. N. Kazaikin, E. A. Larina, D. S. Maltsev, N. V. Neroeva, P. A. Nechiporenko, I. E. Panova, A. A. Plyukhova, S. N. Tultseva, A. Zh. Fursova, F. E. Shadrichev, M. M. Shishkin   +15 more
doaj   +1 more source

The multiferroic phase of DyFeO$_{3}$:an ab--initio study

, 2010
By performing accurate ab-initio density functional theory calculations, we study the role of $4f$ electrons in stabilizing the magnetic-field-induced ferroelectric state of DyFeO$_{3}$.
, Alessandro Stroppa, Binek C, Georg Kresse, Jiang H, Marsman M, Martijn Marsman, Perdew J P, Richter M, Silvia Picozzi   +9 more
core   +1 more source