ARTICLES

39. D. Comanescu, The steady states of antitone electric systems, Math. Meth. Appl. Sci., 24 March 2024, https://doi.org/10.1002/mma.10071  - arXiv - AUTHOREA

38. P. Birtea, I. Casu, D. Comanescu, Laplace-Beltrami operator on the orthogonal group in ambient (Euclidean) coordinates, Applied and Computational Harmonic Analysis, Volume 69, March 2024, 101619 - arXiv - SSRN

 37. D. Comanescu, The steady states of isotone electric systems, Math. Meth. Appl. Sci., Vol. 46, Issue 14 (2023), 15244-15258, doi: 10.1002/mma.9375.- arXiv - AUTHOREA

36. P. Birtea, I. Casu, D. Comanescu, Constraint optimization and SU(N) quantum control landscapes, J. Phys. A: Math. Theor., vol. 55 (2022), No. 11, 115301  - arXiv.  

35. P. Birtea, I. Casu, D. Comanescu, Second order optimality on orthogonal Stiefel manifolds, Bulletin des Sciences Mathématiques, Volume 161, July 2020, 102868 - arXiv. 

34. P. Birtea, I. Casu, D. Comanescu, Characterization of the critical points for the shear-stretch strain energy of a Cosserat problem ,  Z. Angew. Math. Phys. (2020) 71:67, doi: 10.1007/s00033-020-1291-z - Springer Nature SharedIt initiative  - arXiv. 

33. P. Birtea, I. Casu, D. Comanescu, Optimization on the real symplectic group, Monatshefte für Mathematik,191 (2020), 465–485. - Springer Nature SharedIt initiative - arXiv.

32. P. Birtea, I. Casu, D. Comanescu, First order optimality conditions and steepest descent algorithm on orthogonal Stiefel manifolds, Optim. Lett., Vol. 13, Issue 8 (2019), pp. 1773-1791. https://doi.org/10.1007/s11590-018-1319-x. - Springer Nature SharedIt initiative - arXiv.

31. D. Comanescu, Lyapunov matrix equation A^H X+XA+C=O_r with A a Jordan matrix, oct. 2018. - arXiv. 

30. D. Comanescu,  A note on stability of spacecrafts and underwater vehicles, Mathematical Methods in the Applied Sciences, Vol. 41, Issue 4 (2018), pp. 1518-1526, doi: 10.1002/mma.4682. - arXiv.

29. P. Birtea, D. Comanescu, A note on stability of nongeneric equilibria for an underwater vehicle, J. Geom. Phys., Vol. 117 (2017), pp. 99-104. - arXiv.

28. P. Birtea, D. Comanescu, Newton Algorithm on Constraint Manifolds and the 5-electron Thomson problem, J OPTIMIZ THEORY APP, Vol. 173, Issue 2 (2017), pp. 563-583. - Springer Nature SharedIt initiative - arXiv.

27. P. Birtea, D. Comanescu, Hessian operators on Constraint Manifolds, J. Nonlinear science, Vol. 25, Issue 6 (2015), pp. 1285-1305. - arXiv.

26. P. Birtea, D. Comanescu, C.A. Popa, Averaging on Manifolds by Embedding Algorithm, Journal of Mathematical Imaging and Vision, Volume 49, Issue 2 (2014), pp 454-466. - arXiv.

25. D. Comanescu, A note on stability of the vertical uniform rotations of the heavy top, ZAMM, Vol 93, Issue 9 (2013), pp. 697-699. - arXiv.

24. D. Comanescu, Stability of equilibrium states in the Zhukovski case of heavy gyrostat using algebraic methods, Mathematical Methods in the Applied Sciences, Volume 36, Issue 4 (2013) , pp. 373-382. - arXiv.

23. S.S. Dragomir, D. Comanescu, E. Kikianty, Torricellian points in normed linear spaces, Journal of Inequalities and Applications (2013), 2013:258, doi:10.1186/1029-242X-2013-258. 

22. P. Birtea, D. Comanescu, Geometrical Dissipation for Dynamical Systems, Communications in Mathematical Physics, Vol. 316 (2012), pp. 375-394. - arXiv.

21. P. Birtea, I. Casu, D. Comanescu, Sufficient conditions for instability of equilibrium for circulatory and gyroscopic systems, Physica D: Nonlinear Phenomena, Volume 241, Issue 19 (2012), Pages 1655–1659. - arXiv.

20. D. Comanescu, The stability problem for the torque-free gyrostat investigated by using algebraic methods, Appl. Math. Lett., Vol. 25, Issue 9 (2012), pp. 1185–1190. - arXiv.

19. P. Birtea, I. Casu, D. Comanescu, Hamilton-Poisson formulation for the rotational motion of a rigid body in the presence of an axisymmetric force field and a gyroscopic torque, Physics  Letters A, Volume 375, Issue 45, 31 October (2011), Pages 3941–3945. - arXiv.

18. P. Birtea, D. Comanescu, Invariant critical sets of conserved quantities, Chaos, Solitons and Fractals,  Volume 44, Issue 9, September (2011), Pages 693–701. - arXiv. 

17. E. Tulcan-Paulescu, D. Comanescu, M. Paulescu, On Quantum Hydrodynamic Models for Electronic Transport in Nanoscale Semiconductor Devices, Modern Physics Letters B, 24 (4-5) (2010), p. 401-409.

16. P. Birtea, D. Comanescu, Asymptotic Stability of Dissipated Hamilton–Poisson Systems, SIAM J. Appl. Dyn. Syst., Vol. 8, Issue 3 (2009), pp. 967–976.  - arXiv.

15. D. Comanescu, M. Ivan, G. Ivan, The Lyapunov stability for the ε-revised dynamics of the rigid body with three linear controls, J. Comput. Anal. Appl. 11 (2009), no. 3, pp. 546–559. - arXiv.

14. S.S. Dragomir, D. Comanescu, A generalization of the Klamkin inequality (2009).

13. S.S. Dragomir, D. Comanescu, On the Torricellian Point in Inner Product Spaces. Demonstratio Mathematica, XLI (3), (2008), pp. 639-650. - pdf.

12. D. Comanescu, E. Paulescu Tulcan, M. Paulescu, Nanoscale transport description via QHD simulation, Annals of the West University of Timisoara. Physics, Vol. 51 (2007), pp. 56-59.

11. E. Paulescu Tulcan, D. Comanescu, On the quantum correction in the hydrodynamic models for electronic transport in nanoscale semiconductors devices, Analele Univ. Oradea, Fizica, (2007).

10. D. Comanescu, Rectilinear motions of a rocket with variable mass in a force field created by two fixed bodies, Proc. 4-th Int. Conf. Nonlin. Prob. in Aviation and Aerospace ICNPAA. European Conference Publications, Cambridge, (2005), pp. 221-228. 

9. D. Comanescu, Rigid motions for a system with three particles, Proc. of ICNPAA 2004: Mathematical Problems in Engineering and Aerospace Sciences, June 2-4, (2004).

8. S.S. Dragomir, D. Comanescu, C.E.M. Pearce, Geometric means, index mappings and supermultiplicativity, In: Inequality Theory and Applications, Volume 2. Cho, Yeol Je and Kim, Jong Kyu and Dragomir, Sever S, eds. Nova Science Publishers, ‬Huntington, N.Y., (2003) pp. 193-201.    

7. D. Comanescu, S.S. Dragomir, and C.E.M. Pearce, Geometric Means, Index Mappings and Entropy, RGMIA research report collection, (2002) 5 (1). 

6. D. Comanescu, M. Pascal, S. Balint, The stability of a particular motion of a liquid-filled spacecraft, in a flight with continuous propulsion, Third International Conference on Nonlinear Problems in Aviation and Aerospace, Daytona Beach, FL; UNITED KINGDOM; 10-12 May 2000. pp. 179-186. (2001) 

5. S.S. Dragomir, D. Comanescu, Y.J. Cho, and S.S. Kim, On Toricelli's Problem in Inner Product Spaces, RGMIA research report collection, (1999) 2 (3). 

4. S.S. Dragomir, D. Comanescu, C.E.M. Pearce, On some mappings associated with geometric and arithmetic means, Bull. Austral. Math. Soc., Vol. 55 (1997), pp. 299-309.

3. M. Puta M., D. Comanescu, On the rigid body with three linear controls, Analele Universitatii de Vest din Timisoara, Seria Matematică-Informatică, Vol. XXXV, Issue 1, (1997), pp. 63-74. 

2. D. Comanescu, I. Muscutariu, A.M. Balint, St. Balint, O modelare matematica a procesului de crestere a cristalelor cu metoda hidrotermala, Academia Tehnica Militara, A XXVI-a sesiune de comunicari stiintifice cu participare internationala, Bucuresti, 16-17 noiembrie (1995), Vol. 6, pp. 245-252.

1. D. Comanescu, S.S. Dragomir, On Aczel's inequality for semi-inner products on normed linear spaces, Proceedings of the 6-th Symposium of Mathematics and its Applications, 3-4 November 1995, Ed. Mirton, Timisoara, (1995).