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AbstractAbstract
[en] The author presents a review of new results concerning the superconducting state stability under nonstationary conditions. The author considers the effect of small perturbations of the temperature δT and the electric field δE. A general approach is presented to the problem of superconducting state stability in a multifilamentary composite wire carrying a time-dependent transport current I(t). An equation is derived, determining the current-carrying capacity of this wire, i.e., the maximum superconducting current, Im. It is shown that Im depends on the physical properties of the multifilamentary superconducting composite, the geometry of the multifilamentary area, the cooling conditions, and the transport current ramp rate I. The author considers a quench propagation in a multifilamentary composite wire carrying a time-dependent transport current I(t). Concentration is placed on the effect of current ramp rate I and the superconducting state instability on the normal zone propagation velocity v. An equation determining v in a multifilamentary composite wire as a function of I is presented
Source
Reed, R.P.; Fickett, F.R.; Summers, L.T.; Stieg, M. (eds.); 984 p; 1994; p. 569-578; Plenum Press; New York, NY (United States); International cryogenic materials conference (ICMC); Albuquerque, NM (United States); 12-16 Jul 1993; Plenum Publishing Corp., 233 Spring Street, New York, NY 10013 (United States)
Record Type
Book
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Conference
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INIS VolumeINIS Volume
INIS IssueINIS Issue
Vellego, G.; Zacheo, W.; Oliveira Junior, N.F.
Proceedings of the 13. National Meeting on Condensed Matter Physics1990
Proceedings of the 13. National Meeting on Condensed Matter Physics1990
AbstractAbstract
[en] Published in summary form only
Original Title
Fios de 61 e 361 filamentos de NbTi para magnetos supercondutores
Primary Subject
Source
Almeida Fonseca, A.L. de (Brasilia Univ., DF (Brazil)); Koiler, B. (Pontificia Univ. Catolica do Rio de Janeiro, RJ (Brazil)); Brescansin, L.M. (Universidade Estadual de Campinas, SP (Brazil)) (and others); Sociedade Brasileira de Fisica, Rio de Janeiro, RJ (Brazil); 284 p; 1990; p. 249; 13. National Meeting on COndensed Matter Physics; Caxambu, MG (Brazil); 8-12 May 1990; Available from the Library of Comissao Nacional de Energia Nuclear, RJ, Brazil
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Miscellaneous
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Vellego, G.; Otubo, J.; Oliveira Junior, N.F.; Bindilatti, V.
Proceedings of the 9. National Meeting on Condensed Matter Physics1986
Proceedings of the 9. National Meeting on Condensed Matter Physics1986
AbstractAbstract
No abstract available
Original Title
Magnetos supercondutores para sistemas de baixo consumo de Helio
Primary Subject
Source
Sociedade Brasileira de Fisica, Sao Paulo; 194 p; 1986; p. 94; 9. National Meeting on Condensed Matter Physics; Pocos de Caldas, MG (Brazil); 23-26 Apr 1986; Published in summary form only.
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AbstractAbstract
[en] The industrial development of multifilamentary superconducting wires has in the past been essentially concentrated on the two cubic materials (NbTi and Nb/sub 3/Sn, which can be produced with continuous filaments. Progress on Nb/sub 3/Sn wires was obtained by substituting ternary additives (B > 14 T) or by using composite cores (Β = 10 - 12 T). J/sub c/ of Nb/sub 3/Sn wires has been found to vary quite strongly when applying axial and transverse stresses. More recently, monofilamentary wires of complex, noncubic phases as PbMo/sub 6/S/sub 8/ (rhombohedral) and YBa/sub 2/Cu/sub 3/O/sub 7/ (orthorhombic) have been prepared by powdermetallurgical processes. A brief review of the state of art in producing wires of the various systems is given, with a particular emphasis on the material aspect on the current carrying capacity
Primary Subject
Source
10. international conference on magnet technology (MT-10); Boston, MA (USA); 21-25 Sep 1987; CONF-870901--
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Journal Article
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AbstractAbstract
[en] Ag-sheathed SmFeAsO0.7F0.3-δ (Sm-1111) superconducting wires were prepared by a one-step solid state reaction at temperatures as low as 850-900 0C, instead of commonly used temperatures of 1150-1250 0C. The x-ray diffraction pattern of the as-sintered samples is well indexed on the basis of the tetragonal ZrCuSiAs-type structure. We characterized the transport critical current density Jc of the SmFeAsO0.7F0.3-δ wires in increasing and subsequently decreasing fields, by a resistive four-probe method. A transport Jc as high as ∼ 1300 A cm-2 at 4.2 K and self-field has been observed for the first time in Sm-1111 type polycrystalline superconductors. The Jc also shows a rapid depression in small applied fields as well as a magnetic-history dependence, indicating weak-linked grain boundaries. The low-temperature synthesis method can be very beneficial for fabricating the RE-1111 iron oxypnictides in a convenient and safe way.
Primary Subject
Source
S0953-2048(10)49221-0; Available from http://dx.doi.org/10.1088/0953-2048/23/7/075005; Country of input: International Atomic Energy Agency (IAEA)
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Journal Article
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AbstractAbstract
[en] Intramagnetics General Corporation was founded in 1971 as a spin-off from the General Electric Company (GE). IGC is a world leader in superconductivity technology and applications. The US Department of Energy called IGC the United States' top commercial source of low-temperature superconducting wire, and also noted the company's superior performance in high-temperature superconducting wire. This article discusses the products of the company and its present/future plans. Organizational and commercial information is also presented
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Journal Article
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AbstractAbstract
No abstract available
Primary Subject
Source
Available from http://dx.doi.org/10.1070/PU1998v041n02ABEH000372; Abstract only; Country of input: International Atomic Energy Agency (IAEA)
Record Type
Journal Article
Journal
Physics Uspekhi; ISSN 1063-7869;
; v. 41(2); p. 226-230

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AbstractAbstract
[en] Elementary conductors constituted of a plurality of superconducting filaments in a metallic matrix are prepared and then twisted. Elementary conductors with a diameter between 0.05 and 0.25 mm without electric insulation are twisted after heating with a pitch of four time the diameter, finally the conductor is insulated
[fr]
On prepare d'abord des brins elementaires, chacun d'eux etant forme a partir d'une pluralite de filaments supraconducteurs noyes dans une matrice metallique puis torsade, caracterise par le fait que l'on assemble des brins elementaires presentant un diametre compris entre 0.05 mm et 0.25 mm sans isolation electrique prealable, qu'on les torsade ensemble a chaud avec un pas sensiblement egal a quatre fois leur diametre et que l'on effectue ensuite une operation d'isolation electrique du conducteurOriginal Title
Procede de fabrication d'un conducteur a brins multifilamentaires supraconducteurs, et conducteur en resultant
Primary Subject
Source
5 Oct 1990; 30 Mar 1989; 9 p; FR PATENT DOCUMENT 2645335/A/; FR PATENT APPLICATION 8904169; Available from Institut National de la Propriete Industriele, Paris (France); Application date: 30 Mar 1989
Record Type
Patent
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AbstractAbstract
[en] Studies of high aspect ratio structures with widths/thicknesses in the nanometer range - nanowires - have revealed extremely interesting behaviour associated with their reduced dimensionality [Fasol, 1998]. Metal nanowires in particular show interesting magnetic, superconducting and magnetotransport properties, but because it is so difficult to prepare nanowires of the same material with different crystal textures in a controlled fashion, it has been extremely hard to study how the texture affects the physical properties of such nanowires. In this study, an electrochemical system, which allows Pb nanowires to be deposited in nanoporous polycarbonate membranes was fully developed. Superconducting Pb nanowires with diameter ∼50 nm were deposited by pulse electrodeposition. It was shown that the texture of Pb nanowires may be manipulated by varying the pulse potential, either polycrystalline or single-crystal. TEM studies have confirmed that the structure control method is very reproducible and reliable
Original Title
FM/SC multilayer; One-dimensional superconductors
Source
May 1999; [np]; Available from British Library Document Supply Centre- DSC:DXN023981; Thesis (Ph.D.)
Record Type
Miscellaneous
Literature Type
Thesis/Dissertation
Country of publication
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Rodrigues Junior, D.; Pinatti, D.G.
Proceedings of the 13. National Meeting on Condensed Matter Physics1990
Proceedings of the 13. National Meeting on Condensed Matter Physics1990
AbstractAbstract
[en] Published in summary form only
Original Title
Analise de fios supercondutores de BN sub(3)Sn utilizando as teorias de aprisionamento coletivo de vortices
Source
Almeida Fonseca, A.L. de (Brasilia Univ., DF (Brazil)); Koiler, B. (Pontificia Univ. Catolica do Rio de Janeiro, RJ (Brazil)); Brescansin, L.M. (Universidade Estadual de Campinas, SP (Brazil)) (and others); Sociedade Brasileira de Fisica, Rio de Janeiro, RJ (Brazil); 284 p; 1990; p. 242; 13. National Meeting on Condensed Matter Physics; Caxambu, MG (Brazil); 8-12 May 1990; Available from the Library of Comissao Nacional de Energia Nuclear, RJ, Brazil
Record Type
Miscellaneous
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Conference
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