2023

Time evolution of natural orbitals in ab initio molecular dynamics
XVII Iberian Joint Meeting on Atomic and Molecular Physics (IBER 2023), Physics Department of The Faculty of Science and Technology of the University of Coimbra, Coimbra, Portugal (Talk) 
Time evolution of natural orbitals in ab initio molecular dynamics
European Conference on Computational & Theoretical Chemistry (EuChemS CompChem 2023), Olympic Museum of Thessaloniki, Thessaloniki, Greece (Invited Talk) 
GNOF: Balanced treatment of electron correlation
3rd QUANTUM INTERNATIONAL FRONTIERS 2023 (QIF3), Lodz University of Technology, Lodz, Poland (Invited Talk)
2022

BornOppenheimer molecular dynamics in NOF theory
Eleventh International Meeting on Photodynamics and Related Aspects (XI Photodynamics), University of Havana, La Habana, Cuba (Invited Talk) 
Global Natural Orbital Functional
Reduced Density Matrix Functional Theory: Improving its foundations (RDMFT2022), European Centre for Theoretical Studies in Nuclear Physics and related areas (ECT*), Trento, Italy (Invited Talk) 
Benchmarking GNOF against FCI in challenging systems
6th International Conference on Molecular Electronic Structure (MES2022), Institut Supérieur d’informatique et de Mathématiques de Monastir – University of Monastir, Tunisia (Invited Talk) 
Global Natural Orbital Functional: Towards the complete description of the electron correlation
12th Triennial Congress of the World Association of Theoretical and Computational Chemists (WATOC), Vancouver Convention Centre – Vancouver, Canada (Invited Talk) 
RDM2022
International Conference on Reduced Density Matrix Theory for Quantum ManyFermion Systems, Palacio Miramar, Donostia – San Sebastián, Euskadi, Spain (Organizer & Host)
2021

From 1RDMFT to NOF Approximations
International Symposium on Correlated Electrons (SymCorrel21), Munich Center for Quantum Science and Technology (MCQST) (Invited talk)
2019

Natural Orbital Functional for Multiplets
Ninth Conference of AsiaPacific Association of Theoretical and Computational Chemists (APATCC9), Sydney, Australia (Invited talk)

Natural Orbital Functional for Multiplets
24th International Workshop on Quantum Systems in Chemistry, Physics and Biology (QSCPXXIV), Odessa, Ukraine (Invited talk)

Natural Orbital Functional for Multiplets
2nd International Vigo Meeting on Advanced Computational Chemistry (2nd IViMACC), University of Vigo, Vigo, Spain (Invited talk)
2018

Recent Advances in Natural Orbital Functional Theory
23rd International Workshop on Quantum Systems in Chemistry, Physics and Biology (QSCPXXIII), University of Venda, Kruger National Park, South Africa (Invited talk)

Global method for electron correlation based on the NOF theory
11th Congress on Electronic Structure Principles and Applications (ESPA 2018), Universidad de Castilla y la Mancha, Toledo, Spain (Invited talk)

NOFMP2: Global method for electron correlation
255th American Chemical Society National Meeting, New Orleans, LA, USA (Invited talk)
2017
 Natural Orbital Functional Theory
1st International Vigo Meeting on Advanced Computational Chemistry (IViMACC), Vigo, Spain (Invited talk)
 NOFMP2: A global method for the electron correlation
17th European Seminar on Computational Methods in Quantum Chemistry (ESCMQC 2017), Shropshire, United Kingdom (Invited talk)
 NOFMP2: A global method for the electron correlation
11th Triennal Congress of the World Association of Theoretical and Computational Chemists (WATOC 2017), Munich, Germany (Talk)
 NOFMP2: A global method for the electron correlation
International Workshop on ‘New challenges in Reduced Density Matrix Functional Theory: Symmetries, timeevolution and entanglement’, Lausanne, Switzerland (Invited talk)
2016
 NOF Theory: an alternative to DFT
Transborder Theoretical Chemistry Days, Baiona, France (Invited talk)
 The role of the interpair electron correlation in Natural Orbital Functional Theory
8th Molecular Quantum Mechanics, Uppsala, Sweden (Invited talk)
 The role of interpair electron correlation in NOF Theory
9th International Meeting on Photodynamics and related aspects, Mendoza, Argentina (Invited talk)
 Natural Orbital Functional Theory: an alternative to DFT
Kobe workshop for material design on strongly correlated electrons in molecules and materials, Kobe, Japan (Invited talk)
2015
 Performance of the NOF theory in the description of the fourelectron harmonium atom in the singlet state, MOL2NET, International Conference on Multidisciplinary Sciences, MDPI Sciforum, HQ UPV/EHU, Bizkaia, Spain
 Towards an Nrepresentable 1RDM theory
PSIK 2015 Conference (PsiK 2015), San Sebastian, Spain (Talk)  Towards an Nrepresentable NOF theory
Recent Advances in Electronic Structure Theory (RAEST 2015), Nanjing, China (Invited talk)  Towards an Nrepresentable Natural Orbital Functional Theory
The 15th International Congress of Quantum Chemistry (ICQC 15), Beijing, China (Poster)  Towards an Nrepresentable 1RDM theory
10th Seminars of Advanced Studies on Molecular Design and Bioinformatics (SEADIM 10), Varadero, Cuba (Invited talk)
2014
 NOF theory as an alternative to DFT
Current Topics in Theoretical Chemistry, Nha Trang, Vietnam (Invited talk)  PNOF6: A model of interacting pairs in NOF theory
New Approaches in Theoretical Chemistry, Santiago, Chile (Invited talk)  Interacting pairs in natural orbital functional theory
10th Congress of the World Association of Theoretical and Computational Chemists (WATOC 2014), Santiago, Chile (Invited talk)  Nrepresentable 1RDM Theory
XL Congreso de Químicos Teóricos de Expresión Latina (QUITEL 2014), Isla San Cristobal, Ecuador (Invited talk, Plenary)
2013
 The intrapair and interpair electron correlation in Natural Orbital Functional Theory
Symposium in honor of Norman H. March, Namur, Belgium (Invited talk)  Secondorder perturbative corrections in Natural Orbital Functional Theory
FísicoQuímica en América Latina (FQAL), Foz de Iguazu, Brasil (Invited talk)  PNOF5PT2: A useful method for dealing with strongly correlated systems
The VIIIth Congress of the International Society of Theoretical Chemical Physics (ISTCP 8), Budapest, Hungary (Talk)  New Advances in Natural Orbital Functional Theory: PNOF5PT2
9th Seminars of Advanced Studies on Molecular Design and Bioinformatics: Energy (SEADIM9), Varadero, Cuba (Invited talk)  Recent Developments in Natural Orbital Functional Theory: PNOF5PT2
7th Molecular Quantum Mechanics, Lugano, Switzerland (Poster)
2012
 Recent Developments in the Density Matrix Functional Theory
M. Piris, J. M. Matxain, E. Matito, F. Ruipérez, X. Lopez, J. M. Ugalde
7th International Meeting on Photodynamics, Maresias, Sao Paulo, Brazil (Invited talk)  Density Matrix Functional Theory of the Molecular Electronic Structure
M. Piris, J. M. Matxain, F. Ruipérez, X. Lopez, J. M. Ugalde
Theory and Applications of Computational Chemistry (TACC 2012), University of Pavia, Italy (Invited talk)  Designed porous solids based on endohedrally doped CdS nanoclusters
E. JimenezIzal, J.M. Matxain, M. Piris, J. M. Ugalde
Modelling realistic inorganic nanostructures: bridging the gap between theory and experiment, University of Zaragoza, Spain (Invited talk)  The Molecular Orbitals in Natural Orbital Functional Theory
M. Piris, J.M. Matxain, X. Lopez, F. Ruipérez, J. Uranga, G. Merino, J. M. Mercero, E. Matito, J. M. Ugalde
Workshop on ab initio Valence Bond Theory, Paris, France (Invited talk)  The Molecular Orbitals in Density Matrix Functional Theory
M. Piris, J.M. Matxain, X. Lopez, F. Ruipérez, J. Uranga, G. Merino, J. M. Mercero, E. Matito, J. M. Ugalde
Theoretical Chemistry in Rio, Rio de Janeiro, Brazil (Invited talk)  The Piris Natural Orbital Functional (PNOF): towards biological applications.
E. Matito, M. Piris, J.M. Matxain, X. Lopez, J. M. Ugalde
X Girona Seminar on Theoretical and Computational Chemistry for the Modeling of Biochemical Systems: From Theory to Applications, Girona, Spain (talk)  Can NOFT bridge the gap between DFT and WFT?
M. Piris, J.M. Matxain, F. Ruipérez, X. Lopez, E. Matito, J. M. Ugalde
Kathmandu Workshop on Theoretical Chemistry, Kathmandu, Nepal (Invited talk)  Density Matrix Functional Theory of the Molecular Electronic Structure
M. Piris, J.M. Matxain, F. Ruipérez, X. Lopez, J. M. Ugalde
Symposium Challenges in Density Matrix and Density Functional Theory, Ghent, Belgium (Invited talk)  NOF theory approach to strong electron correlation in chemistry
M. Piris, J.M. Matxain, F. Ruipérez, X. Lopez, J. M. Ugalde
The 52nd Sanibel Symposium, St. Simons Island, Georgia, USA (Invited talk)
2011
 Chemical accuracy in NOF theory
M. Piris, J.M. Matxain, F. Ruipérez, X. Lopez, J. M. Ugalde
XXXVII Congreso de Químicos Teóricos de Expresión Latina (QUITEL), Riviera Maya, Mexico (Invited talk)  Towards chemical accuracy in natural orbital functional theory
M. Piris, X. Lopez, J.M. Matxain, F. Ruipérez, J. M. Ugalde
14th Intern. Conf. on the Applic. of Density Functional Theory in Chemistry and Physics (DFT 2011), Athens, Greece (Talk)  Natural Orbital Functional Theory and Implementation
M. Piris, X. Lopez, J.M. Matxain, F. Ruipérez, J. M. Ugalde
Ninth Triennial Congress of the WORLD ASSOCIATION OF THEORETICAL AND COMPUTATIONAL CHEMISTS (WATOC), Santiago de Compostela, Spain (Invited talk)  Theoretical Foundations of PNOF
M. Piris, X. Lopez, J. M. Matxain, F. Ruipérez, J. M. Ugalde
Ninth Triennial Congress of the WORLD ASSOCIATION OF THEORETICAL AND COMPUTATIONAL CHEMISTS (WATOC), Santiago de Compostela, Spain (Poster)  From the IBCS method to the NOF theory.
M. Piris, X. Lopez, J. M. Matxain, F. Ruipérez, J. M. Ugalde
8th Seminars of Advanced Studies on Molecular Design and Bioinformatics: Light and Molecules (SEADIM 8), Universidad de la Habana, Cuba (Invited talk)  Application of Natural Orbital Functional Theory to the description of Reactive Oxygen Species
M. Piris, J. M. Matxain, F. Ruipérez, X. Lopez and J. M. Ugalde
5th Symposium on Theoretical Biophysics (THEOBIO), Madeira, Portugal (Poster)
2010
 Accurate description of atoms and molecules by NOF theory
M. Piris, J. M. Matxain, X. Lopez and J. M. Ugalde
6th International Meeting on Photodynamics, La Habana, Cuba (Poster)  New advances in NOF theory: paving the way towards chemical accuracy.
M. Piris, J.M. Matxain, X. Lopez, J. M. Ugalde
IX Girona Seminars 2010, Girona, Spain (Invited talk)
2009
 Description of biological important systems by the PNOF1
M. Piris, J. M. Matxain, X. Lopez and J. M. Ugalde
4th Symposium on Theoretical Biophysics (THEOBIO), Roscoff, France (Poster)  Iterative diagonalization for orbital optimization in NOF theory
M. Piris and J. M. Ugalde
Applications of Density Functional Theory (DFT09), Lyon, France (Poster)  Iterative diagonalization for orbital optimization in natural orbital functional theory
M. Piris and J. M. Ugalde
International Conference of Computational Methods in Sciences and Engineering (ICCMSE09), Rhodes, Greece (Poster)
2008
 TFON: Una alternativa viable en la química computacional
M. Piris
XXXIV Congresso dei Chimici Teorici di Espressione Latina (CHITEL08), Cetraro, Italy (Invited talk)  NOF: Making its way towards a reliable computational method
M. Piris
VIII Girona Seminars 2008, Girona, Spain (Invited talk)  PNOF dissociation study of the radical helium dimer
M. Piris, J. M. Matxain and J. M. Ugalde
6th Congress on Electronic Structure: Principles and Applications (ESPA08), Palma de Mallorca, Spain (Poster)  Avances recientes en la Teoría del Funcional de Orbitales Naturales
M. Piris
19 Conferencia de Quimica, Santiago de Cuba, Cuba (Invited talk)
2007
 van der Waals interactions within the NOFT
M. Piris, X. Lopez, J. M. Ugalde
Theoretical Biophysics Symposium (THEBIO07), Cetraro, Italy (Poster)  New solids based on B12N12 fullerenes
J. M. Matxain, J. M. Mercero, X. Lopez, M. Piris, J. M. Ugalde, L. A. Eriksson, J. Poater, E. Matito, M. Sola
Trends in Nanotechnology (TNT2007), San Sebastian, Spain (Poster)  The helium dimer within the NOFT
M. Piris, J. M. Matxain and J. M. Ugalde
Applications of Density Functional Theory (DFT07), Amsterdam, The Netherlands (Poster)  Interacciones de dispersión en la teoría del funcional de orbitales naturales
M. Piris, X. Lopez, J. M. Ugalde
XXXIII Congreso de Químicos Teoricos de Expresion Latina (QUITEL07), La Habana, Cuba (Invited talk)
2006
 Funcional de Orbitales Naturales
M. Piris
Seminario de estudios avanzados sobre diseño molecular y bioinformatica (SEADIMB VI), La Habana, Cuba (Invited Talk)  Multidecker sandwichlike complexes of the aromatic square Al4_2 with gold
M. Piris, J. M. Mercero, D. SanchezPortal, J. M. Ugalde
3rd NanoSpain Workshop, Pamplona, Spain (Poster)  NOF Theory based on a new approach for the twoelectron cumulant
M. Piris, X. Lopez and J. M. Ugalde
Electronic Structure: Principles and Applications (ESPA06), Santiago de Compostela, Spain (Poster)  Dispersion interactions within NOFT
M. Piris
Donostia Quantum Chemistry Symposium (DQCS06), San Sebastian, Spain (Invited talk)
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