Superconductor
Mostrando 1-12 de 56 artigos, teses e dissertações.
-
1. Novel Design of a Hybrid Superconducting Fault Current Limiter with Controlled Solid-State Device
Abstract Fault current limiters are essential devices used to protect the power system and its equipment against high levels of fault current, which are growing up due to the increase of new power sources. This paper proposes a novel design of a Hybrid Superconducting Fault Current Limiter (Hybrid SFCL), which is composed basically by thyristors in series wi
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2021-06
-
2. Kinetics of Vacancy Doping in SrTiO3 Studied by in situ Electrical Resistivity
The kinetics of annealing to transform stoichiometric SrTiO3 insulator into a vacancy-doped semiconductor-superconductor was revisited by in situ electrical resistivity measurements. SrTiO3 single crystals were grown by Floating Zone Method. Using a homemade apparatus several electrical resistivity as a function of time were measured at different temperature
Mat. Res.. Publicado em: 03/05/2018
-
3. Fe-Doping Effect on the Bi3Ni Superconductor Microstructure
The substitution effects of Fe ion on the structure of the intermetallic Bi3Ni1-xFex (0 ≤ x ≤ 0.10) superconductor were studied. The morphology of samples consists of an inhomogeneous laminar slab-like microstructure. The main phase corresponds to Bi3Ni1-xFex with an orthorhombic structure (Pnma), but with very small quantities of impurities of BiNi and
Mat. Res.. Publicado em: 13/03/2017
-
4. Preparation and characterization of a homemade Josephson junction prepared from a thin film sintered in a domestic microwave oven
A homemade Josephson junction was successfully obtained using a superconductor thin film of the BSCCO system. The film was deposited on a lanthanum aluminate, produced from a commercial powder with a nominal composition Bi1.8Pb0.4Sr2CaCu2Ox, was thermally treated by a domestic microwave oven. The XRD analysis of the film indicated the coexistence of Bi-2212
Mat. Res.. Publicado em: 08/03/2016
-
5. Development and test of a small resistive fault current limiting device based on Hg, Re-1223 and Sm-123 ceramics
Several reports describing Superconducting Fault Current Limiter (SFCL) containing members of the bismuth or yttrium ceramics were already described. However, none of these included the mercury and samarium cuprates. Consequently, we have conducted a study of a resistive-type superconductor fault current limiter based on Hg0.82Re0.18Ba2Ca2Cu3O8+d samples and
Mat. Res.. Publicado em: 03/06/2014
-
6. Dynamic analysis of superconductor at high temperature for antennas array
The analysis and new results of the resonance frequency and radiation pattern of antennas array, for glass fiber FR-4 substrate using superconductor and copper patch, are presented. The linear superconducting rectangular antennas array uses the new materials SnBaCaCuOy at temperature of 160 K with conductivity equal 1.5 x 10(5) S/m. The concise full wave Tra
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2013-12
-
7. PROCESSAMENTO, CARACTERIZAÇÃO E ESTUDO DOS FENÔMENOS CRÍTICOS NO SUPERCONDUTOR (Gd1 xCex)Ba2Cu3O7- δ
This work presents a systematic study of the effects of CeO2 addition to the superconductor system (Gd1-xCex)Ba2Cu3O7δ, with 0,0 x 0,05, in polycrystalline form. Samples were obtained following the solid state reaction standard technique in which high purity chemical precursors (99,99%) were employed, Gd2O3, CeO2, BaCO3 and CuO. For the structural chara
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 09/03/2012
-
8. Desenvolvimento em um biogradiômetro multicanal supercondutor com SQUIDs DC para registro de medidas de magnetocardiografia fetal / Development of a Superconductor Multichannel Biogradiometer with SQUIDs DC for use in FoetalMagnetocardiography. Dissertation(Master)
Neste projeto trabalhou-se no desenvolvimento de uma nova instrumentação para registrar medidas de campos magnéticos de origem biológica baseados em sensores SQUID e sistemas auxiliares, com o objetivo de usar este arranjo na aquisição de medidas de magnetocardiografia fetal (MCGf), que consiste no registro dos campos magnéticos gerados pela atividade
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 26/07/2011
-
9. Hg0.8Re0.2Ba2Ca2Cu 3O8.8 thick film produced by Laser Ablation
This paper describes the development of Hg0.8Re0.2Ba2Ca2Cu 3O8.8 thick film prepared with a precursor Ba2Ca2Cu3O5+d thick film, which was layered by Laser Ablation technique on PrBa2Cu3O7 substrate. The precursor thick film was thermally treated under mercury atmosphere using an encapsulate quartz tube technique. DC critical current measurements below T C de
Journal of Microwaves, Optoelectronics and Electromagnetic Applications. Publicado em: 2011-06
-
10. Single-phase resistive superconductor electrical current limiter
This paper presents the analysis, design, construction and ac test results of low voltage single-phase resistive superconductor electrical current limiters. Two different types of resistive superconductor current limiter are presented: the first one is built with three concentric, cylindrical and helicoidal coils connected in parallel and the second one is b
Publicado em: 2011
-
11. Single layer cylindrical and helicoidal coil with voids between successive turns electromagnetic field calculation to be used in superconductor current limiter simulator for design purpose
A very accurate mathematical method, named Helicoidal Method, to calculate the flux density vector B produced by the current circulating in the resistive single-phase superconductor electrical current limiter (RSCL) coils, at any point of the its whole space, using the Biot-Savart’s Law is presented in this paper. It is very important to remember that thes
Publicado em: 2011
-
12. Fast single layer cylindrical and helicoidal coil with voids between turns electromagnetic field calculation to be used in superconducting current limiter simulator for design purpose
This paper presents a mathematical method to quickly calculate the flux density vector B produced by the current circulating in a resistive single-phase superconducting electrical current limiter (RSCL), at any point of its whole space, using the Biot-Savart’s Law. As the calculation using the exact form of the turns of each coil (single layer cylindrical
Publicado em: 2011