BrainMap

Mircea Nasui

- UNIVERSITATEA TEHNICA DIN CLUJ - NAPOCA

Researcher | Teaching staff

Web of Science ResearcherID: C-2594-2012

Expertise & keywords

Nano-engineered Magnetic Pinning Centers in High Temperature Superconducting Epitaxial Thin Films Call name: Projects for Young Research Teams - RUTE -2014 call
PN-II-RU-TE-2014-4-2848 2015 - 2017

Role in this project: Key expert

Coordinating institution: UNIVERSITATEA TEHNICA DIN CLUJ - NAPOCA

Project partners: UNIVERSITATEA TEHNICA DIN CLUJ - NAPOCA (RO)

Affiliation: UNIVERSITATEA TEHNICA DIN CLUJ - NAPOCA (RO)

Project website: http://proiect-magpin.weebly.com/

Abstract:

The main objective of the present project is to investigate the potential of magnetic pinning for the enhancement of the transport properties of high temperature superconducting (HTS) epitaxial films close to the critical temperature, where, due to the thermal activation, the condensation energy pinning is not effective. As HTS films the YBa2Cu3O7 (YBCO) epitaxial films will be considered due to their technological relevance in the fabrication of HTS coated conductors. Two different innovative approaches are taken into consideration in order to create nanometric magnetic pinning centers in the YBCO film: magnetic nanoparticle surface decoration using polymer based methods and YBCO/ferromagnetic core-shell nanocomposites films. It is to be noted that the proposed methods are scalable and, therefore, they could rapidly be implemented at an industrial level.

Thick YBa2Cu3O7 films with improved parameters for superconducting coatings Call name: Joint Applied Research Projects - PCCA-2011 call, Type 1
PN-II-PT-PCCA-2011-3.1-0258 2012 - 2016

Role in this project: Key expert

Coordinating institution: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA

Project partners: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA (RO); UNIVERSITATEA TEHNICA DIN CLUJ - NAPOCA (RO); INSTITUTUL NATIONAL DE CERCETARE DEZVOLTARE PENTRU FIZICA LASERILOR, PLASMEI SI RADIATIEI - INFLPR RA (RO)

Affiliation: UNIVERSITATEA TEHNICA DIN CLUJ - NAPOCA (RO)

Project website: http://lab20.infim.ro/projects/TYBCO/index.html

Abstract:

The project is devoted to the fabrication of thick YBa2Cu3O7 (YBCO) films with improved critical current density Jc for superconducting coatings. It is well known that Jc decreases with increasing film thickness, and our aim is to introduce combined artificial pinning centres and to grow super-lattices in a few micron thick films so that Jc to remain well above 1 MA/cm2 (at 77 K and self field). The fabrication route will involve Pulsed Laser Deposition (PLD) and chemical deposition (CSD), and the optimal conditions will be decided after the structural characterization (XRD, SEM, TEM, AFM, STM) of nanostructured thick YBCO superconducting films, correlated with a detailed investigation of the supercurrent transport properties (resistive measurements and SQUID magnetometry). The novelty of this proposal is to use a combined vortex pinning effect resulting from the presence of columnar defects, randomly distributed nanoparticles, and the substrate decoration with metal nanodots, as well as the quasi-multilayer approaches, in order to diminish the detrimental effects of various vortex excitations. The starting materials will be mainly those for YBCO with various inclusions, and different substrates, including LZO and Gd-added CeO2-buffered textured substrates (RABiTS approach), will be probed. The proposed project is multi-disciplinary one: materials science, surface science, nanotechnology, chemistry, condensed matter physics, applied and superconductivity and magnetism. A special care will be devoted to the changes in the vortex dynamics (dissipation processes) appearing with the modification of the complex film microstructure, which necessitates a better understanding of the effects of many vortex excitations and vortex creep regimes appearing in this situation: half vortex loops, double vortex kinks, super-kinks, variable range vortex hopping, plastic and elastic vortex creep.

DOPING AND SIZE EFFECTS ON THE MAGNETIC, STRUCTURAL AND MORPHOLOGICAL PROPERTIES AND SPIN DYNAMICS IN MICRO AND NANOSTRUCTURED FERROMAGNETIC OXIDES. Call name: Complex Exploratory Research Projects - PCCE-2008 call
PN-II-ID-PCCE-2008-0106 2010 - 2013

Role in this project: Key expert

Coordinating institution: Universitatea Tehnica din Cluj Napoca

Project partners: Universitatea Tehnica din Cluj Napoca (RO); Institutul National de Cercetare Dezvoltare pentru Tehnologii Izotopice si Moleculare-INCDTIM-Cluj Napoca (RO); Institutul National de Cercetare Dezvoltare pentru Fizica Tehnica-INCDFT-Iasi (RO); Institutul National pentru Fizica Materialelor-INCDFM-Bucuresti (RO); INSTITUTUL NATIONAL DE CERCETARE-DEZVOLTARE PENTRU METALE NEFEROASE SI RARE (RO); Universitatea Politehnica din Bucuresti (RO)

Affiliation: Universitatea Tehnica din Cluj Napoca (RO)

Project website: http://c4s.utcluj.ro/Current%20projects%20-PNII.html

Abstract:

Diluted magnetic oxides (DMO) are expected to play an important role in interdisciplinary materials science and future electronics because charge and spin degree of freedom coexist into single material. The control of the high temperature ferromagnetism and of the spin and charge transport in DMO micro- and nanostructures represent a necessary condition for the achievement and miniaturization of spintronic devices which could operate at and above the ambient temperature. The project involves a competitive and complementary partnership between 2 Technical Universities and 4 National R&D Institutes and has the main goal to obtain top research results based on the experimental and theoretical researches which will be performed on micro- and nanostructured semiconducting ferromagnetic oxide systems synthesized by innovating methods. By means of that, it will be answered to the still controversial problems in the fundamental research referring to the effects induced by the low dimensionality, magnetic ions doping degree and by the synthesis methods on the propitious characteristics necessarily to get the high temperature ferromagnetism in II-VI oxide semiconductors.

FROM MICRO TO MACRO - CONTINUUM SCALE MODELING OF ADVANCED MATERIALS IN VIRTUAL FABRICATION Call name: Complex Exploratory Research Projects - PCCE-2008 call
PN-II-ID-PCCE-2008-0100 2010 - 2013

Role in this project: Key expert

Coordinating institution: Universitatea Tehnica din Cluj Napoca, CENTRUL DE CERCETARE IN TEHNOLOGIA DEFORMARII TABLELOR

Project partners: Universitatea Tehnica din Cluj Napoca, CENTRUL DE CERCETARE IN TEHNOLOGIA DEFORMARII TABLELOR (RO); Universitatea Tehnica din Cluj Napoca, LABORATOR DE MICROSCOPIE ELETRONICA (RO); Universitatea Tehnica din Cluj Napoca, LABORATOR DE STIINTA MATERIALELOR, FILME SUBTIRI (RO); Universitatea Tehnica din Cluj Napoca, CENTRUL DE CERCETAREIN PRELUCRAREA IMAGINILOR SI RECUNOASTEREA FORMELOR (RO); Institutul de Matematica Simion Stoilov al Academiei Romane (RO); Universitatea din Bucuresti (RO)

Affiliation: Universitatea Tehnica din Cluj Napoca, LABORATOR DE STIINTA MATERIALELOR, FILME SUBTIRI (RO)

Project website: http://www.comod.utcluj.ro

Abstract:

The purpose of the project consists in the development material models at microscopic scale and their transfer to macroscopic scale by implementation in computer programmes for the simulation of sheet metal forming processes. In order to achieve this purpose, four objectives have been defined. The first objective consists in the experimental characterization of the materials selected for testing at micro- and macro-level. By achieving this objective, a database referring to the plastic behaviour of the tested materials will be created. The second objective consists in the development of plasticity models at micro- and macro-level. By achieving this objective, the members of the consortium will have a set of realistic and robust plasticity models able to describe the anisotropic behaviour of materials. The third objective consists in the implementation of the previously developed models in computer programmes for the simulation of the sheet metal forming processes. By achieving this objective, the consortium will have a set of robust and efficient computer programmes for the numerical simulation of hydraulic bulging, deep-drawing of cylindrical parts and prediction of the forming limit curves. The last objective of the project consists in the experimental validation the simulation programmes previously elaborated. By achieving this objective, a set of simulation programmes having a high accuracy will be available for the use in industrial applications with the aim of obtaining a realistic and robust virtual prototype. The achievement of the general purpose needs the cooperation between experts from interdisciplinary domains and having a rich expertise in modelling, numerical methods, experimental procedures, with a comprehensive understanding of the phenomena that occur at micro- and macroscopic scale. With this aim in view, an interdisciplinary and complementary consortium as concerns the scientific background and the laboratory equipment has been established.

FILE DESCRIPTION	DOCUMENT
List of research grants as project coordinator or partner team leader
Significant R&D projects for enterprises, as project manager
R&D activities in enterprises
Peer-review activity for international programs/projects