Institute annual report 2025 (in progress)

version: July 7, 2025.

updates: …

Human resources

Researchers

The Numerical Analysis and Approximation Theory workgroup:

• Dr. Emil Cătinaş
• Prof. Dr. Octavian Agratini (workgroup coordinator)
• Dr. Mihai Nechita
• Dr. Diana Otrocol
• Imre Boros
• Andra Malina
• Eduard Grigoriciuc

The Numerical Modeling workgroup:

• Prof. Dr. Radu Precup, corresponding member of the Romanian Academy
• Dr. Călin-Ioan Gheorghiu (workgroup coordinator)
• Dr. rer. nat. habil. Nicolae Suciu
• Dr. Maria Crăciun
• Andrei Stan
• Andrei Gasparovici (till June, 2025)

Doctoral students/postdocs:

Doctoral students in 2025:

• Eduard Grigoriciuc, at UBB Cluj
• Andra Malina, Metode de aproximare a functiilor de mai multe variabile, at UBB Cluj
• Andrei Stan, Nash type equilibria for systems of nonlinear equations, at UBB Cluj.
• Andrei Gasparovici, (title to be completed), at UBB Cluj (hired since August 2024)

Postdoc students in 2025: –

PhD advisors

Prof. dr. Radu Precup, corresponding member of the Romanian Academy
PhD students (2025):

• Alexandru Hofman, Control problems for systems of Kolmogorov type, at UBB Cluj
• David Brumar, The analysis of some mathematical models in fluid dynamics, at UBB Cluj.
• … (to be completed)

Coordination of doc and postdoc students: Nataliia Kolun (Ukraine).
Mentor in some research projects: Lorand Parajdi, Mihai Nechita, Maria Neuss-Radu.

Prof. Univ. dr. Octavian Agratini
(no PhD students in 2025)

Dr. rer. nat. habil. Nicolae Suciu
(no PhD students in 2025)

Papers published in 2025

Papers in JCR journals from abroad

1. T. Catinas, A. Malina, Spherical Shepard-Bernoulli operator, J. Appl. Math. Comput., 71 (2025), pp. 1267–1283, https://doi.org/10.1007/s12190-024-02285-z
2. N. Suciu, S. Nepal, Y. Wondmagegne, M. Ögren, A. Muntean, Global random walk for one-dimensional one-phase Stefan-type moving-boundary problems: Simulation results, Comp. Appl. Math., 44 (2025), art. no. 377. https://doi.org/10.1007/s40314-025-03334-4
3. R. Bunoiu, R. Precup, Localization and multiplicity for stationary Stokes systems with variable viscosity, Communications in Mathematical Analysis and Applications, 4 (2025) no. 2, pp. 151–178. https://doi.org/10.4208/cmaa.2025-0001,
4. Precup, A. Stan, Wei-Shih Du, Control of semilinear differential equations with moving singularities, Fractal and Fractional, 9 (2025), 198, 1-14, https://doi.org/10.3390/fractalfract9040198
5. Al. Hofman, R. Precup, A fixed-point approach to control problems for Kolmogorov type second-order equations and systems, Journal of Fixed Point Theory and Applications, 27 (2025), art. no. 7, https://doi.org/10.1007/s11784-024-01160-5
6. R. Precup, A. Stan, Fixed point results and the Ekeland variational principle in vector B-metric spaces, Axioms, 14 (2025), 250, 1-19, https://doi.org/10.3390/axioms14040250
7. U. Abel, O. Agratini, R. Păltănea, Szász–Mirakjan–Durrmeyer operators defined by multiple Appell polynomials, Positivity, 29 (2025), art. no. 17, https://doi.org/10.1007/s11117-024-01108-6
8. A. Pop, M. Craciun, Two complementary approaches of the periodicity detection in astronomical time series, Experimental Astronomics, 59 (2025) art. no. 24, https://doi.org/10.1007/s10686-025-09995-7
9. C.I. Gheorghiu, Chebyshev collocation solutions to some nonlinear and singular third-order problems relevant to thin-film flows, Journals Modern Mathematical Physics, 1 (2025) no. 1, art. no. 5, 15 pp., https://doi.org/10.3390/mmphys1010005
10. C.I. Gheorghiu, Accurate Chebfun solutions to third-order nonlinear BVPs on the half-line. Applications in boundary layer theory, Physica Scripta, 2025, https://doi.org/10.1088/1402-4896/adc51a 
11. A. Stan, Role of partial functionals in the study of variational systems, TMNA, 2025. https://doi.org/10.12775/TMNA.2024.033
12. …

Papers in JCR journals from Romania

• D. Otrocol, V. Ilea, A. Novac, Fixed point results for non-self operators R₊m-metric spaces, Fixed Point Theory, 26 (2025) no. 1, 177-188, https://doi.org/10.24193/fpt-ro.2025.1.10

Chapters in books in recognized publishing houses/proceedings

• N. Suciu, F.A. Radu, J.S. Stokke, E. Cătinaș, A. Malina, Computational orders of convergence of iterative methods for Richards’ equation, in: Sequeira, A., Silvestre, A., Valtchev, S.S., Janela, J. (eds) Numerical Mathematics and Advanced Applications ENUMATH 2023, vol. 2. ENUMATH 2023. Lecture Notes in Computational Science and Engineering, vol. 154 (2025), pp. 379–388. Springer, Cham. https://doi.org/10.1007/978-3-031-86169-7_39

Papers published in Scopus journals

Papers in other proceedings

Papers accepted and published online

• E.Ş. Grigoriciuc, g-Loewner chains and the Graham–Kohr extension operator in complex Banach spaces, Comput. Methods Funct. Theory, (2025), https://doi.org/10.1007/s40315-025-00581-8

Preprints in Arxiv/submitted/accepted

• R. Precup, A. Stan, On equilibrium in control problems with applications to evolution systems, arXiv:2409.09805, 2024.
• A. Stan Localization of critical points in annular conical sets via the method of Nehari manifold, Preprint, 2025. https://doi.org/10.48550/arXiv.2503.12371
• A. Stan, Free-surface equatorial flows with surface tension in spherical coordinates, Preprint, 2024. https://doi.org/10.48550/arXiv.2412.04763
• …

Prizes, outstanding achievements

• Prof. Dr. R. Precup has H-index ISI 16: https://www.webofscience.com/wos/author/rid/B-8158-2011 (h-index Google Scholar 23)
• Dr. rer. nat. habil. N. Suciu has H-index ISI 13: https://www.webofscience.com/wos/author/rid/N-7971-2017 (h-index Google Scholar 14)
• Prof. Dr. O. Agratini has H-index ISI 10: https://www.webofscience.com/wos/author/rid/B-6607-2012 (h-index Google Scholar 20)

Since 2022, O. Agratini is professor emeritus at the Faculty of Mathematics and Computer Science (Babeş-Bolyai University).

Editorial activity

Editors-in-Chief/deputy/senior editors of JCR/ISI or Scopus journals

• R. Precup, Editor-in-Chief of Studia UBB Math. (ISI/ESCI)
• R. Precup, Deputy Editor-in-Chief of Fixed Point Theory (Cluj) (ISI)
• O. Agratini, Editor-in-Chief of J. Numer. Anal. Approx. Theory (Scopus)
• E. Cătinaş, Editor-in-Chief of J. Numer. Anal. Approx. Theory (Scopus)
• O. Agratini, senior Editor of Studia UBB Math. (ISI/ESCI)

Members of editorial boards of JCR/ISI journals

– JCR/ISI journals abroad

• R. Precup, section Editor of Fixed Point Theory and Algorithms for Sciences and Engineering (Springer);
• R. Precup, editor of Journal of Inequalities and Special Functions.

– JCR/ISI journals from Romania

• R. Precup, member of the Editorial Board of Proceedings of the Romanian Academy- Series A
• R. Precup, member of the Editorial Board of Carpathian Journal of Mathematics
• R. Precup, Deputy Editor-in-Chief of Fixed Point Theory (Cluj)
• R. Precup, Editor-in-Chief of Studia UBB Math.
• O. Agratini, senior Editor of Studia UBB Math.
• O. Agratini, member of the Editorial Board of J. Science and Arts.
• M. Nechita, secretary of Studia UBB Math.

Members of editorial boards of journals of the Romanian Academy

• O. Agratini, Editor-in-Chief of J. Numer. Anal. Approx. Theory
• E. Cătinaş, Editor-in-Chief of J. Numer. Anal. Approx. Theory
• M. Nechita, secretary of J. Numer. Anal. Approx. Theory
• A. Malina, secretary of J. Numer. Anal. Approx. Theory
• A. Stan, secretary of J. Numer. Anal. Approx. Theory
• R. Precup, member of the Editorial Board of Mathematica (Cluj)
• O. Agratini, member of the Editorial Board of Mathematica (Cluj)

Members of editorial boards of other journals from abroad

• R. Precup, member of the Editorial Board of Discussiones Mathematicae Differential Inclusions, Control and Optimization (Poland);
• O. Agratini, member of the Editorial Board of Open Journal of Discrete Mathematics;
• R. Precup, member of the Editorial Board of Mathematics in Engineering, Science and Aerospace (USA).

Members of editorial boards of other journals from Romania

• R. Precup, member of the Editorial Board of Transylvanian Journal of Mathematics and Mechanics;
• N. Suciu, member of the Editorial Board of ROMAI Journal
• C.I. Gheorghiu, member of the Editorial Board of ROMAI Journal

Conferences

Conferences organized by the Institute

• The international conference Numerical Analysis, Numerical Modeling, Approximation Theory (NA-NM-AT 2025), will be organized by ICTP in this autumn.

Institute members in the scientific committees of international or national conferences

Institute members in the organizing committees of international or national conferences

Invited speakers:

Talks given/conferences attended by the members of the Institute

International conferences

National conferences

Presentations at seminars

Scientific collaborations

ICTP has signed in July 2023 a collaboration protocol with Data and Predictive Analytics Center (DPAC – Rochester University, USA), based on some existing collaborations. The agreement aims in solving some problems in the analysis, processing and modelling of some time series from astronomy.

International scientific collaborations

• N. Suciu, collaboration with F.A. Radu, from Univ. of Bergen, Norway
• N. Suciu, collaboration with A. Muntean, from Karlstad University, Sweden
• N. Suciu, collaboration with I.S. Pop, from Univ. of Hasselt, Belgium
• E. Cătinaş, collaboration with F.A. Radu, from Univ. of Bergen, Norway
• R. Precup, collaboration with Jorge Rodriguez-Lopez, from Univ. of Santiago de Compostela, Spain
• R. Precup, collaboration with Sylvain Koumla, from Univ. Abéché, Chad;
• R. Precup, collaboration with Christian Guenther, from Univ. Hannover, Germany;
• R. Precup, collaboration with Maria Neuss-Radu, ffrom FAU Erlangen-Nürnberg, Germany;
• R. Precup, collaboration with Renata Bunoiu, from Univ. Lorraine, France;
• M. Nechita, collaboration with Erik Burman, from University College London;
• M. Nechita, collaboration with Lauri Oksanen, from University of Helsinki;
• M. Nechita, collaboration with Miguel A. Fernández, from INRIA Paris;
• M. Nechita, collaboration with Muriel Boulakia, from Université de Versailles;
• M. Nechita, collaboration with Maria Neuss-Radu, from FAU Erlangen-Nürnberg, Germany;
  
• O. Agratini, collaboration with Ulrich Abel, from Technische Hochschule Mittelhessen, Friedberg, Germany;
• O. Agratini, collaboration with Harun Karsli, from Abant Izzet Baysal University, Bolu, Turkey;
• O. Agratini, collaboration with Francesco Altomare, from University of Bari Aldo Moro, Italy;
• O. Agratini, collaboration with Ralf Rigger, from Friedberg, Germany;
• O. Agratini, collaboration with Tanmoy Som, from Indian Institute of Technology (BHU) Varanasi;
• O. Agratini, collaboration with Quy Muoi Oham;
• M. Craciun, collaboration with Mihai Barbosu, Rochester Institute of Technology, New York, USA;
• A. Stan, collaboration with Du Wei-Shih, National Kaohsiung Normal University, Taiwan;
• A. Stan, collaboration with Calin Iulian Martin, University of Vienna.

National scientific collaborations

• O. Agratini, collaboration with Mircea Ivan, Technical University Cluj-Napoca;
• O. Agratini, collaboration with Radu Păltănea, Transilvania University of Brașov;
• M. Craciun, collaboration with Tiberiu Harko, from Babes-Bolyai University, Cluj-Napoca;
• M. Craciun, collaboration with Alexandru Pop, Astronomical Institute, Astronomical Observatory Cluj-Napoca, Romanian Academy;
• A. Malina, collaboration with Teodora Catinas, from Babes-Bolyai University, Cluj-Napoca;
• E. Grigoriciuc, collaboration with Mirela Kohr, from Babes-Bolyai University, Cluj-Napoca;
• R. Precup, collaboration with Petru Jebelean, from West University, Timisoara;
• R. Precup, collaboration with Mirela Kohr, from Babes-Bolyai University, Cluj-Napoca
• R. Precup, collaboration with Nataliia Kolun, from Babes-Bolyai University, Cluj-Napoca;
• R. Precup, collaboration with Lorand Parajdi, from Babes-Bolyai University, Cluj-Napoca;
• R. Precup, collaboration with Veronica Ilea, from Babes-Bolyai University, Cluj-Napoca;
• R. Precup, collaboration with Adela Novac, from Technical University Cluj-Napoca;
• R. Precup, collaboration with Stefan Haplea, from Iuliu Hațieganu University of Medicine and Pharmacy Cluj-Napoca;
• A. Stan, collaboration with Cristina Gheorghe from Babes-Bolyai University, Cluj-Napoca.

Membership in professional organizations

• R. Precup, O. Agratini, D. Otrocol: SSMR (Societatea de Științe Matematice din România) members.
• E. Cătinaş, SIAM (Society for Industrial and Applied Mathematics) member  (since 2007), SSMR (Societatea de Științe Matematice din România).
• E. Grigoriciuc: SSMR (Romanian Mathematical Society) member (since 2020), AMS (American Mathematical Society) member (since 2021), LMS (London Mathematical Society) member (since 2021), EMS (European Mathematical Society) member (since 2021), SIAM (Society for Industrial and Applied Mathematics) member (since 2024).
• C.I. Gheorghiu, ROMAI (Societatea Română de Matematică Aplicată și Industrială), GAMM (Gesellschaft für angewandte Mathematik und Mechanik), ECMI (European Consortium for Mathematics in Industry) member.
• O. Agratini: AMS (American Mathematical Society) member.
• M. Crăciun, SIAM (Society for Industrial and Applied Mathematics) member.
• M. Nechita, SIAM (Society for Industrial and Applied Mathematics) member.
• A. Malina, SIAM (Society for Industrial and Applied Mathematics), AMS (American Mathematical Society) member.

Grants/contracts/scholarships

Peer review

Members of national committees

• –

Members of PhD/habilitation evaluation committees

Members of PhD supervising committees

Referee reports for peer reviewed journals:

Expert evaluators:

• –

Book reviews:

• A. Stan: 1 book review.
• E. Grigoriciuc: 1 book review.

Reviews (written in 2024)

for Mathematical Reviews:

• O. Agratini:
• R. Precup:
• C. Mustăța (honorary member): 

For ZBL Math:

• R. Precup:
• C.I. Gheorghiu: