Despre noi

Grupul de cercetare se reuneşte săptămânal – marţi de la 14 la 16 în sala “e” a clădirii Mathematica.

Şedinţele au caracter de informare şi documentare relativ la direcţiile de cercetare promovate de colectiv.

Bilunar au loc expuneri plenare.

Direcţii de cercetare:

  • teoria aproximării
  • metode numerice
  • procese liniare de aproximare
  • procese aleatoare
  • ecuaţii stohastice
  • calcul paralel
  • matematici financiare

In anul universitar 2020-2021 activitatile se desfasoara exclusiv online.

Colectivul

Prof. Dr. Agratini Octavian

COORDONATOR

Conf. Dr. Habil. Cӑtinaş Teodora

Conf. Dr. Chiorean Ioana

Conf. Dr. Habil. Lisei Hannelore

Conf. Dr. Habil. Micula Sanda

Conf. Dr. Roșca Alin Vasile

Conf. Dr. Roșca Natalia

Conf. Dr. Róth Ágoston

Conf. Dr. Soós Anna

Conf. Dr. Trîmbițaș Radu

Lect. Dr. Radu Voichița-Adriana

Lect. Dr. Somogyi Ildikó

La seminarii participă toți
STUDENȚII DOCTORANZI
care elaborează lucrarea în domeniul de cercetare al grupului.

Seminarii de cercetare

Anul universitar 2020-2021, semestrul I

  • 13 octombrie

Vizualizare cu restictii impuse folosind operatorul de interpolare Shepard-Bernoulli (conf. univ. habil. Teodora Cătinaș

  • 3 noiembrie
Evaluarea vitezei de convergenta in caz multidimensional a unei clase de operatori de tip integral (prof. univ. Octavian Agratini) 
  • 24 noiembrie

Asupra unei metode iterative de rezolvare a ecuatiilor neliniare (invitat: cercet. pr. Emil Cătinaș, Inst. de Calcul T. Popoviciu, Acad. Romana)

  • 8 decembrie

Asupra unor metode numerice iterative pentru ecuatii integrale Fredholm cu nucleu singular (conf. univ. habil. Sanda Micula)

  • 12 ianuarie
  • Punctul de stagnare a unui nanofluid peste o placa nealiniata ce se dilata/contracta cu viteza de alunecare de ordin doi (conf. univ. Natalia Rosca)

 

 

Articole notabile

Articole notabile ale membrilor colectivului, aparute incepand cu anul universitar 2017-2018:

  • T. Cătinaş,, Nielson interpolation operators on an arbitrary triangle with one curved side, BIT Numerical Mathematics, 2021, doi: 10.1007/s10543-021-00842-7 [cuartila 1]
  • Alin V. Roşca, Natalia C. Roşca, Ioan Pop, Mixed convection stagnation point flow of a hybrid nanofluid past a vertical flat plate with a second order velocity model, Vol. 31 (2021), no. 1, pp. 75 – 91, INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW [cuartila 1]
  • Jafarimoghaddam, Natalia C. Roşca, Alin V. Roşca, Ioan Pop, The universal Blasius problem: New results by Duan–Rach Adomian Decomposition Method with Jafarimoghaddam contraction mapping theorem and numerical solutions, Vol. 187 (2021), no. 9, pp. 60 – 76, MATHEMATICS AND COMPUTERS IN SIMULATION [cuartila 2]
  • Jafarimoghaddam, M. Turkyilmazoglu, Alin V. Roşca, Ioan Pop, Complete theory of the elastic wall jet: A new flow geometry with revisited two-phase nanofluids, Vol. 86 (2021), pp. 25– 36, EUROPEAN JOURNAL OF MECHANICS B-FLUIDS [cuartila 2]
  • Ghalambaz, Natalia C. Roşca, Alin V. Roşca, Ioan Pop, Mixed convection and stability analysis of stagnation-point boundary layer flow and heat transfer of hybrid nanofluids over a vertical plate, INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW, Vol. 30 (2020), no. 7, pp. 3737 – 3754. [cuartila 1]
  • A.M. Acu, M. Dancs, V.A. Radu, Representations for the inverses of certain operators, Communications on Pure and Applied Analysis, 19(8) (2020), 4097-4109.    [cuartila 2]
  • Agratini, O.Properties of discrete non-multiplicative operators,  ANALYSIS AND MATHEMATICAL PHYSICS, Vol. 9, Issue 1, 2019, 131 – 141.      [cuartila 1]
  • S. Micula, On some iterative numerical methods for mixed Volterra-Fredholm integral equations, Symmetry, Vol. 11(10), 1200, 2019, 1-10,  doi:10.3390/sym11101200    [cuartila 2]
  • M. Acu, O. Dogru, C.V. Muraru, V.A. Radu, Approximation Properties of Certain Bernstein–Stancu Type Operators, Journal of Mathematical Inequalities, 13 (3) (2019), 687-702.   [cuartila 2]
  •  M. Acu, T. Acar, C.V. Muraru, V.A. Radu, Some approximation properties by a class of bivariate operators, Mathematical Methods in the Applied Sciences, 42 (2019), 1-15, https://doi.org/10.1002/mma.5515    [cuartila 2]
  • M. Acu, T. Acar, V.A. Radu, Approximation by modified $U^{\rho}_n$ operators, Revista de la Real Academia de Cientias Exactas Fisicas Y Naturales Serie A-Matematicas (RACSAM), 113 (3) (2019), 2715-2729, s13398-019-00655-y.    [cuartila 1]
  • Roşca, N.C., Roşca, A.V., Pop, I., Unsteady separated stagnation point flow and heat transfer past a stretching/shrinking sheet in a copper-water nanofluid,  International Journal of Numerical Methods for Heat and Fluid Flow, Vol. 29, Issue 8, pp. 2588-2605, 2019 [cuartila 2].
  • Roşca, A.V., Roşca, N.C., Pop, I., Stagnation point flow of a nanofluid past a non-aligned stretching/shrinking sheet with a second order slip velocity, International Journal of Numerical Methods for Heat and Fluid Flow, Vol. 29, Issue 2, pp. 738-762, 2019 [cuartila 2].
  • Agratini, O., Approximation with arbitrary order by certain linear positive operators,  POSITIVITY, Vol. 22, Issue 5, 2018, 1241 – 1254.    [cuartila 2]
  • Abel, U., Agratini, O., Păltănea, R., A complete asymptotic expansion for the quasi- interpolants of Gauss-Weierstrass operators, MEDITERRANEAN JOURNAL OF MATHEMATICS, Vol. 15, Issue 4, 2018, Article 156, 10 pages.    [cuartila 1]
  • Micula, S., An iterative numerical method for fractional integral equations of the second kind, J. Comput. Appl. Math., Vol. 339, 2018, 124-133, doi:10.1016/j.cam.2017.12.006.    [cuartila 1]
  • Micula, S., Cattani, C., On a numerical method based on wavelets for Fredholm-Hammerstein integral equations of the second kind, Math. Method. Appl. Sci., Vol. 41(18), 2018. 9103-9115, doi:10.1002/mma.4952.   [cuartila 2]
  • Sheremet, M.A., Roşca, N.C., Roşca, A.V., Pop, I., Mixed convection heat transfer in a square porous cavity filled with a nanofluid with suction/injection effect, Computers & Mathematics with Applications, Vol. 76, Issues 11–12, pp. 2665-2677, 2018 [cuartila 1].
  • Borrelli, A., Giantesio, G., Patria, Roşca, N.C.,Roşca, A.V., Pop, I., Influence of temperature and magnetic field on the oblique stagnation-point flow for a nanofluid past a vertical stretching/shrinking sheet, International Journal of Numerical Methods for Heat and Fluid Flow, Vol. 28, Issue 12, pp. 2874-2894, 2018 [cuartila 2].
  • Pop, I., Roşca, N.C.,Roşca, A.V., MHD stagnation-point flow and heat transfer of a nanofluid over a stretching/shrinking sheet with melting, convective heat transfer and second-order slip, International Journal of Numerical Methods for Heat and Fluid Flow, Vol. 28, Issue 9, pp. 2089-2110, 2018   [cuartila 2]
  • Lisei H., Varga Cs., Vas O., Localization method for the solutions of nonhomogeneous operator equations, Applied Mathematics and Computation 329,  64–83 (2018)    [cuartila 1]
  • Sheremet, M.A., Roşca, A.V., Pop, I., The influence of thermal radiation on unsteady free convection in inclined enclosures filled by a nanofluid with sinusoidal boundary conditions, International Journal of Numerical Methods for Heat and Fluid Flow, Vol. 28, Issue 8, pp. 1738-1753, 2018    [cuartila 2]
  • Agratini, O., Aral, A., Deniz, E., On two classes of approximation processes of integral type, POSITIVITY, Vol. 21, Issue 3, 2017, 1189 – 1199.    [cuartila 2]
  • Cătinaş, T., Extension of some particular interpolation operators to a triangle with one curved side, Applied Mathematics and Computation 315 (2017) 286-297.    [cuartila 1]
  • Micula, S.,  On some iterative numerical methods for a Volterra functional integral equation of the second kind, J.Fixed Point Theory Appl., Vol. 19, 2017, 1815–1824, doi:10.1007/s11784-016-0336-6.    [cuartila 2]
  • Giantesio, G., Verna, A., Roşca, N.C., Roşca, A.V., Pop, I.,  MHD mixed convection oblique stagnation-point flow on a vertical plate, INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW, Vol. 27, no. 12, pp. 2744 – 2767, 2017;    [cuartila 2]
  • Roşca, N.C., Roşca, A. V., Merkin, J., Pop, I., Mixed convection flow, heat transfer, species concentration near the stagnation point on a vertical flat plate with Stefan coupled blowing, INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW, Vol. 27, no. 1, pp. 77 – 103, 2017;   [cuartila 2]
  • Borrelli, A., Giantesio, G., Patria, M.C., Roşca, N.C., Roşca, A.V., Pop, I., Buoyancy effects on the 3D MHD stagnation-point flow of a Newtonian fluid, COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION, Vol. 43, pp. 1-13, 2017;   [cuartila 1]
  • Roşca, N.C., Pop, I.,  A numerical study of the axisymmetric rotational stagnation point flow impinging radially a permeable stretching/shrinking surface in a nanofluid, INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW, Vol. 27, no. 11, pp. 2415 – 2432, 2017.     [cuartila 2]
  • Roşca, N.C., Pop, I., Axisymmetric rotational stagnation point flow impinging radially a permeable stretching/shrinking surface in a nanofluid using Tiwari and Das model, SCIENTIFIC REPORTS, Vol. 7, 40299, pp. 1-11, 2017.    [cuartila 1]
  • Juhász, I.,  Róth, A.Adjusting the energies of curves defined by control points, Computer-Aided Design, 107 : 77 – 88,   https://doi.org/10.1016/j.cad.2018.09.003;     [cuartila 1]
  • Róth, A.Algorithm 992: An OpenGL- and C++-based function library for curve and surface modeling in a large class of extended Chebyshev spaces, ACM Transactions on Mathematical Software, Vol. 45, No. 1, Article 13, https://doi.org/10.1145/3284979;     [cuartila 1]