· N. Cotfas (in collaboration with Daniela Dragoman):

Discrete Wigner function and finite Gaussians

*Bucharest University Faculty of Physics 2011 Meeting*, Bucharest, June 20, 2014.

· N. Cotfas (in collaboration with Daniela Dragoman, Jean-Pierre Gazeau and Apostol Vourdas):

On a phase space approach to finite quantum systems

*The XXIX International Colloquium on Group-Theoretical Methods in Physics*,

20-24 August 2012, Tianjin (Nankai), China.

· N. Cotfas (in collaboration with Daniela Dragoman, Jean-Pierre Gazeau and Apostol Vourdas):

On a phase space approach to finite quantum systems

*Central European Workshop on Quantum Optics*, 2 - 6 July 2012, Sinaia, Romania.

· N. Cotfas: Finite-dimensional Hilbert space and frame quantization

*Bucharest University Faculty of Physics 2011 Meeting*, Bucharest, June 17, 2011.

· N. Cotfas: Explicitly solvable Schrodinger type equations

*University of Bucharest, Faculty of Physics*, Bucharest, March 24, 2011.

· N. Cotfas: Coverings with regular polygons obtained by projection,

*Quasicrystals. The Silver Jubilee*, Tel Aviv, Israel, Oct. 14-19, 2007.

· N. Cotfas: Permutation representations with application to quasicrystals and carbon nanotubes,

* 17 ^{th} Symposium on Condensed Matter Physics- SFKM 2007 *, Vrsac, Serbia, Sept. 16-20, 2007.

· N. Cotfas: Modified version of the strip projection method and applications,

* International Conference on Aperiodic Crystals *, Zao, Miyagi, Japan, Sept. 17-22, 2006.

· N. Cotfas: Group representations with application to quasicrystals and carbon nanotubes,

* 26 ^{th} International Colloquium on Group Theoretical Methods in Physics *, New York, June 26-30, 2006.

· N. Cotfas: Shape invariant hypergeometric type operators and applications,

* MASSEE International Congress on Mathematics MICOM-2006*, Paphos, Cyprus, May 31- June 4, 2006.

· N. Cotfas: Associated hypergeometric-type functions and coherent states,

* 8 ^{th} WSEAS International Conference on APPLIED MATHEMATICS*,

Puerto De La Cruz, Tenerife, Dec. 16-18, 2005.

· N. Cotfas: Symmetries of hypergeometric type special functions,

* 4 ^{th} International Symposium "Quantum Theory and Symmetries"* incorporating

· N. Cotfas: An alternate mathematical model for single-wall carbon nanotubes,

* 6 ^{th} International Conference on the Science and Application of Nanotubes*, Goteborg, June 26-July 1, 2005.

· N. Cotfas: On the self-similarities of the mathematical models used in quasicrystal physics,

* Second Conference on Self-Similarity and Applications*, Toulouse, June 20-24, 2005.

· N. Cotfas: Permutation representations defined by G-clusters with application to quasicrystal physics,

* Discrete Groups and Geometric Structures with Applications IV*, Oostende, May 31-June 3, 2005.

· N. Cotfas: Representations of the symmetry groups of carbon nanotubes and applications,

* Discrete Groups and Geometric Structures with Applications IV*, Oostende, May 31-June 3, 2005.

· N. Cotfas: On the strip projection method and symmetry properties of the window,

* 9 ^{th} International Conference on Quasicrystals ICQ9*, Ames (Iowa-USA), May 22-26, 2005.

· N. Cotfas: Quasiperiodic packings of icosahedral clusters obtained by projection,

* 2 ^{th} National Conference on Theoretical Physics*, Constanta, August 26-29, 2004.

· N. Cotfas: Quasiperiodic packings of icosahedral clusters obtained by projection,

* 11 ^{th} International Conference "Symmetry Methods in Physics"*, Prague, June 21-24, 2004.

· N. Cotfas: Quasiperiodic packings of icosahedral clusters obtained by projection,

* Fourth European Congress of Mathematics*, Stockholm, June 27-July 2, 2004.

· N. Cotfas: Systems of orthogonal polynomials defined by hypergeometric type equations,

* Fourth European Congress of Mathematics*, Stockholm, June 27-July 2, 2004.

· N. Cotfas: Systems of orthogonal polynomials defined by hypergeometric type equations,

*International Workshop on Orthogonal Polynomials: Orthogonal Polynomials and Mathematical Physics*, Leganes, July 5-8, 2004.

· N. Cotfas: Representations of the icosahedral group with application to quasicrystals,

* International Conference on Aperiodic Crystals*, Bello Horizonte (Brazil), Sept. 8-13, 2003.

· N. Cotfas: Hypergeometric type functions in a supersymmetric approach,

* XIV International Congress on Mathematical Physics*, Lisbon, July 28-August 2, 2003.

· N. Cotfas: Raising and lowering operators in the theory of hypergeometric type equations,

*5 ^{th} Congress of Romanian Mathematicians*, Pitesti, June 22-28, 2003.

· N. Cotfas: Special functions, raising and lowering operators,

*XXIV International Colloquium on Group Theoretical Methods in Physics* , Paris, July 15-20, 2002.

· N. Cotfas: A group-theoretic approach to quasicrystals,

* International Conference on Aperiodic Crystals*, Nijmegen (Holland), July 2000.

· N. Cotfas: Finite graphs associated with a cut-and-project set,

* DI-CRM Workshop on Mathematical Physics*, Prague, June, 2000.

· N. Cotfas: Self-similarities of model sets and their diffraction spectrum,

* 7 ^{th} International Conference on Quasicrystals*, Stuttgart, Sept. 1999.

· N. Cotfas and J._L. Verger-Gaugry: Models of quasicrystals defined by G-clusters and their self-similarities,

*Mathematics of Quasicrystals*, Paris, Sept. 23-25, 1998.

· N. Cotfas and J.-L. Verger-Gaugry: G-clusters and quasicrystals,

* International Conference on Aperiodic Crystals*, Alpe d'Huez, August, 1997.

· N. Cotfas: Cluster models of quasicrystals obtained by using n-dimensional permutation representations

of finite groups associated wuth their orbits, *Colloque Quasicristaux *, Paris , June 5-7, 1996.

· N. Cotfas: 4-Dimensional crystallography and the diamond structure,

*Quasicrystals International School * Balatonfured , Hungary, May 13-20, 1995.

· N. Cotfas: Une classe d'operateurs O_{h}^{7}-invariants et applications dans la physique des semiconducteurs,

*Colloque franco-roumain de mathematiques purres et appliquees *, Paris, May 1-8, 1994.

Pagină actualizată la 20 Iulie 2017.