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Nicolae POPA
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CURRICULUM VITAE

Education:

  • 1968: M. Sc in Physics, Faculty of Physics, University of Bucharest
  • 1988: PhD in Physics, Institute of Physics and Nuclear Engineering “Horia Hulubei”, Bucharest
PNicolae

Professional skills:

  • Solid state physics
  • X-ray and neutron scattering (mostly diffraction)
  • Crystallography
  • Numerical analysis and programming

Research contributions on topics of:

  • Optics of the X-ray and neutron scattering instruments
  • Secondary extinction in single crystal X-ray and neutron diffraction
  • Domain structure in ferroelectrics and ferroelastics by single crystals neutron diffraction
  • Thermal diffuse scattering correction in single crystal neutron diffraction
  • Microstructure by powder diffraction
  • Improvement of the Rietveld method and extension of its applications
    • Implementation in the Rietveld method of the modern theory of texture: extension of the method to quantitative texture analysis
    • Models of anisotropic crystallite size and microstrain in the Rietveld codes for all Laue classes
    • Crystallite size distributions by diffraction and the whole powder pattern fitting (Rietveld included)
    • Macro strain/stress effects (residual or load) by diffraction:
      • Reuss model in the Rietveld programs for all Laue classes
      • New approach based on generalized spherical harmonics representation of macro strain/stress
  • Fundamentals in crystallography: atoms in general positions obeying reflection conditions of special positions

Professional experience acquired abroad (working stages):

  • 1974: fellowship of I.A.E.A. at the University of Rio de Janeiro, Brazil, (one year)
  • 1982-1987: researcher, Neutron Physics Laboratory, Joint Institute for Nuclear Research, Dubna, Russia
  • 1996–1998: NATO Collaborative Research Grant, at Oxford University(two visits of three weeks each)
  • 2000 – 2001: guest researcher, National Institute for Standards and Technology, Boulder, Colorado, USA
  • 2002 – 2007: Deputy Director, Neutron Physics Laboratory, Joint Institute for Nuclear Research, Dubna, Russia

Awards:

  • First Prize of the Joint Institute for Nuclear Research, Dubna, Russia, for the year 1987
  • Award for Physics “Dragomir Hurmuzescu” of the Romanian Academy of Science for the year 1998

Member in international journals editorial staff:

  • Co-Editor of the journal “Texture, Stress and Microstructure”, Hindawi Publishing Corporation. (see http://www.hindawi.com and also http://www.hindawi.com/journals/tsm/editors.html )

Selected recent publications:

 Pseudo extra reflection conditions
Popa Nicolae C.
ACTA CRYSTALLOGRAPHICA SECTION A, Volume: 67, Pages: 310-314, DOI: 10.1107/S0108767311009202, Part: Part 3, Published: MAY 2011

 

 Strain and stress tensors of rolled uranium plate by Rietveld refinement of TOF neutron-diffraction data
Balzar D.; Popa N. C.; Vogel S.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, Volume: 528, Issue: 1, Pages: 122-126, DOI: 10.1016/j.msea.2010.06.002, Published: NOV 25 2010

 

 New analytical approximation of diffraction size broadened peak profile for spherical crystallites with a lognormal distribution
Popa N. C.; Teodorescu C. M.; Frunza S.
JOURNAL OF APPLIED CRYSTALLOGRAPHY, Volume: 43, Pages: 1027-1030, DOI: 10.1107/S0021889810024829, Part: Part 5, Published: OCT 2010

 

 Size-strain line-broadening analysis of the ceria round-robin sample
Balzar D; Audebrand N; Daymond MR; et al.
JOURNAL OF APPLIED CRYSTALLOGRAPHY, Volume: 37, Pages: 911-924, DOI: 10.1107/S0021889804022551 , Part: Part 6, Published: DEC 2004

 

 U4O9: atoms in general sites giving the hkl extinctions of special sites
Popa NC; Willis BTM
ACTA CRYSTALLOGRAPHICA SECTION A, Volume: 60, Pages: 318-321, DOI: 10.1107/S0108767304012188 , Part: Part 4, Published: JUL 2004

 

 Elastic-strain tensor and inhomogeneous strain in thin films by X-ray diffraction
Balzar D; Popa NC
Conference:Symposium on Optical and X-Ray Metrology for Advanced Device Materials CharacterizationLocation: Strasbourg, FRANCEDate: JUN 10-13, 2003
Sponsor(s): European Mat Res Soc
THIN SOLID FILMS, Volume: 450, Issue: 1, Pages: 29-33, DOI: 10.1016/j.tsf.2003.10.043, Published: FEB 22 2004

 

 An analytical approximation for a size-broadened profile given by the lognormal and gamma distributions
Popa NC; Balzar D
JOURNAL OF APPLIED CRYSTALLOGRAPHY, Volume: 35, Pages: 338-346, DOI: 10.1107/S0021889802004156 , Part: Part 3, Published: JUN 2002

 

 Elastic strain and stress determination by Rietveld  refinement: generalized treatment for textured polycrystals for all Laue classes
Popa NC; Balzar D
JOURNAL OF APPLIED CRYSTALLOGRAPHY, Volume: 34, Pages: 187-195, DOI: 10.1107/S0021889801002060 , Part: Part 2, Published: APR 1 2001

 

 The instrumental profile for a neutron powder diffractometer in focusing geometry
Popa NC; Ionita I
Conference:2nd European Conference on Neutron Scattering (ECNS 99)Location: BUDAPEST, HUNGARYDate: SEP 01-04, 1999
Sponsor(s): European Neutron Scattering Assoc; Budapest  Neutron Ctr; Atominstitut Vienna; Forsch Zentrum Julich; HMI Berlin; ILL Grenoble; IRI Delft; ISIS Didcot; LLB Saclay; NFL Sudsvik; NPI Rez;  Nuclear & Technol Inst Lisbon; PSI Villigen; Riso Natl Lab; TU  Munich; Australian Nuclear Sci & Technol Org; European Phys Soc;  Hungarian Acad Sci; Hungarian Minist Educ; Neutronentechn Komponenten  GmbH; Ordela Inc; Oxford Instruments; Ingenieurburo Stronciwilk; Swiss  Neutron; Neutron Round Table; OMFB, Natl Comm Technol Dev; Paks Nuclear  Power Plant; Adv Ceram Copr; CERCA; Eurisys Mesures; Goodfellow  Cambridge Ltd; KJ Lesker Co; Mirrotron Ltd
PHYSICA B, Volume: 276, Pages: 192-194, DOI: 10.1016/S0921-4526(99)01243-0, Published: MAR 2000

 

 Diffraction-line shift caused by residual stress in polycrystal for all Laue groups in classical approximations
Popa NC
JOURNAL OF APPLIED CRYSTALLOGRAPHY, Volume: 33, Pages: 103-107, DOI: 10.1107/S0021889899013357 , Part: Part 1, Published: FEB 2000

 

 Design for a focusing high-resolution neutron crystal diffractometer
Ionita I; Stoica AD; Popovici M; et al.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, Volume: 431, Issue: 3, Pages: 509-520, DOI: 10.1016/S0168-9002(99)00280-6, Published: JUL 21 1999

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Updated: 31 ian 2012 - Ionel Stavarache: stavarache@infim.ro