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Kolkata, India

Mukhopadhyay K.,University of Burdwan | Ghosh M.,ICAS | Mallick P.K.,University of Burdwan | Chakrabarti P.K.,University of Burdwan
Materials Science and Engineering B: Solid-State Materials for Advanced Technology | Year: 2014

Multiferroic (MF) nanoparticles of GaFeO3 (GFO) were prepared by sol-gel method. To modulate the magneto-dielectric property, nanoparticles of GFO are incorporated in Ni0.40Zn0.40Cu 0.20Fe2O4 (NZCF). Crystallographic phases of all the samples are confirmed by analyzing the X-ray diffractograms using FULLPROF program. The hysteretic behavior observed in the polarization vs. electric field loops recorded at room temperature (RT) confirmed the ferroelectric ordering of GFO and (GaFeO3)0.50(Ni 0.40Zn0.40Cu0.20Fe2O 4)0.50 (GFO-NZCF). Temperature dependent dielectric constant of GFO and GFO-NZCF shows the ferroelectric to paraelectric transition at 625 and 680 K, respectively. The dielectric constant measured in presence and absence of magnetic field confirmed that the samples are MFs with positive magneto-capacitance (MC) co-efficient. Interestingly, electric polarization and MC co-efficient of GFO are increased in GFO-NZCF. Room temperature Raman spectra of GFO and NZCF have been compared with that of GFO-NZCF and the observed changes have been co-related with the enhanced polarization of GFO-NZCF. © 2014 Elsevier B.V. All rights reserved. Source


Mahapatra A.S.,University of Burdwan | Mitra A.,University of Burdwan | Mallick A.,University of Burdwan | Ghosh M.,ICAS | Chakrabarti P.K.,University of Burdwan
Materials Letters | Year: 2016

To enhance the magnetic property of LaFeO3 (LFO), a well known antiferromagnetic multiferroic, Ho3+ doping [La0.9Ho0.1FeO3 (LHFO)] is considered using solid state reaction method. The crystallographic phase is confirmed by Rietveld analysis of X-ray diffractograms. Raman spectra observed at room temperature also ruled out the formation of any impurity phase. Magnetisation vs. field loops of LHFO recorded at different temperatures in the range of 300-5 K show considerable enhancement of magnetization of LHFO compared to that of LFO. MH loops recorded at low temperatures suggests antiferromagnetic to ferromagnetic transition in LHFO which is also in agreement with the measurements of magnetisation vs. temperature curve under zero field cooled and field cooled conditions. Modulation of magnetic behaviour in LHFO compared to that of LFO will enhance the quality of application in electronic devices. © 2016 Published by Elsevier B.V. Source


TurtU S.,ENEA | Righetti R.,ICAS | Quagliata F.,CRIOTEC
20th IMEKO TC4 Symposium on Measurements of Electrical Quantities: Research on Electrical and Electronic Measurement for the Economic Upturn, Together with 18th TC4 International Workshop on ADC and DCA Modeling and Testing, IWADC 2014 | Year: 2014

Actually, the ITER (International Thermonuclear Experimental Reactor) project mission is to endow the scientific and engineering feasibility for fusion energy. Built LHC (Large Hadron Collider) at CERN, ITER has become the largest project in applied superconductivity and, besides its technical complexity, ITER represent a management challenge as it bases on a unique worldwide collaboration of seven partners (China, EU, India, Japan, US, Russia and South Korea), who provide 90% of the components as in-kind contributions. Among ITER components, magnet system for plasma confinement is one of the most complex and advanced superconducting magnet systems ever designed, and its production is involving six of the ITER partners (all but India). In the following, quality assurance/quality control programs that have been implemented by ITER Organization (IO) to ensure conductor production uniformity and full traceability of intermediate assemblies across numerous suppliers will be illustrated. Source


Moldovan I.C.,Transilvania University of Brasov | Sofletea N.,Transilvania University of Brasov | Curtu A.L.,Transilvania University of Brasov | Abrudan I.V.,Transilvania University of Brasov | And 2 more authors.
Notulae Botanicae Horti Agrobotanici Cluj-Napoca | Year: 2010

The chloroplast DNA of 34 sessile oak (Quercus petraea) and 27 pedunculate oak (Q. robur) populations covering the entire natural distribution of the two oak species in Eastern Romania was investigated using four large regions of the chloroplast genome by PCR and RFLP technique. A total of seven chloroplast DNA haplotypes sensu lato have been observed by analysing 305 mature trees. However, due to the high resolution of the electrophoresis method a total of 22 chloroplast variants could have been detected, with new mutations and fragment combinations in two of the amplified regions: psbC/trnD and trnT/trnF. All of the haplotypes belong to the phylogenetic lineages A and E, which originate from the Balkan Peninsula. Most of genetic diversity is distributed among populations (GST=0.779). The chloroplast DNA haplotypes are shared by the two oak species. Different dispersal abilities may explain the higher value of genetic differentiation among populations in sessile oak than in pedunculate oak. Source


Della Corte A.,ENEA | Di Zenobio A.,ENEA | Muzzi L.,ENEA | Turtu S.,ENEA | And 13 more authors.
IEEE Transactions on Applied Superconductivity | Year: 2013

The European and the Korean contributions to the ITER Project in terms of cable-in-conduit conductors have been assigned to the Italian Consortium for Applied Superconductivity (ICAS). ICAS' charter members are: ENEA, with the role of general supervision and monitoring, CRIOTEC Impianti S.r.l., in charge of jacketing activities, and TRATOS Cavi S.p.A., with the duty of cable manufacturing. The ITER production consists of about 40 km of Nb3Sn toroidal field (TF) conductor and 22 km of NbTi poloidal field (PF) conductor, for coils 1 and 6. As part of the EU contribution to the construction of the JT-60SA Japanese Tokamak Reactor, ICAS is also in charge of producing about 28 km of NbTi TF conductor, required for the whole TF magnet system. Thanks to the high level and unique expertise available at ICAS, the consortium has been also assigned to manufacture the ITER Central Solenoid conductor samples to be tested in SULTAN for the final, positive, assessment of the updated design. In the present paper, the steps leading to the successful qualification of the main production processes will be described. What is more, the manufacturing of the first conductor unit lengths of the 'production phase,' i.e., the ones that will be wound to operate in the actual ITER TF and JT-60SA TF superconducting magnets, will be reported. The fabrication of the ITER CS conductor samples will be illustrated as well. © 2012 IEEE. Source

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