Investigation of transport mechanisms induced by filament-coupling bridges- network in Bi-2212 wires

2021 ◽  
Author(s):  
Achille Angrisani Armenio ◽  
Alessandro Leveratto ◽  
Gianluca De Marzi ◽  
Andrea Traverso ◽  
Cristina Bernini ◽  
...  
Keyword(s):  
Treatment Process ◽  
Magnetic Measurements ◽  
Electrical Coupling ◽  
Effective Length ◽  
Ac Losses ◽  
Transport Mechanisms ◽  
High Critical Current Density ◽  
Magnet Design ◽  
Partial Melt ◽  
Precursor Powders

Abstract One of the features unique in Bi-2212/Ag wires is the network of bridges between the filaments formed by grains grown through the Ag matrix during the partial-melt heat treatment process. Although these interconnections favor a redistribution of the current among the filaments allowing high critical current density, they represent a strong electrical coupling between the filaments themself. Such a coupling increases the AC losses, present also in case of charge and discharge of DC magnets, principal applications of this kind of superconductor. In this work, through transport and magnetic measurements and their comparison, we study the behavior of these bridges as a function of applied magnetic field and temperature and the implications they have on the electrical coupling. The experiment has been performed on two multifilamentary wires prepared by GDG-PIT process starting from two commercial Bi-2212 precursor powders: Nexans and Engi-Mat. The reported results provide information on the effective length scale on which the filaments are coupled as a function of the field and temperature and we believe that such findings can be useful in magnet design.

High critical current density in grain‐oriented bulk YBa2Cu3Oxprocessed by partial melt growth

1990 ◽  
Vol 57 (24) ◽  
pp. 2606-2608 ◽  
Author(s):  
Donglu Shi ◽  
M. M. Fang ◽  
Justin Akujieze ◽  
Ming Xu ◽  
J. G. Chen ◽  
...  
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
High Critical Current Density ◽  
Melt Growth ◽  
Partial Melt

Critical state and AC losses in multifilamentary BiSrCaCuO-2223/Ag tapes studied by transport and magnetic measurements

1997 ◽  
Vol 279 (1-2) ◽  
pp. 39-46 ◽  
Author(s):  
F. Gömöry ◽  
L. Gherardi ◽  
R. Mele ◽  
D. Morin ◽  
G. Crotti
Keyword(s):  
Critical State ◽  
Magnetic Measurements ◽  
Ac Losses

scholarly journals Modified heat-treatment process of precursor powders for Bi-2212 tapes preparation

2012 ◽  
Vol 27 ◽  
pp. 268-271 ◽  
Author(s):  
Q.B. Hao ◽  
C.S. Li ◽  
S.N. Zhang ◽  
L.F. Bai ◽  
X.B. Ma ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Treatment Process ◽  
Heat Treatment Process ◽  
Precursor Powders

Energizing Epithelial Transport with the Vacuolar H+-ATPase

Physiology ◽  
2001 ◽  
Vol 16 (4) ◽  
pp. 145-151 ◽  
Author(s):  
Klaus W. Beyenbach
Keyword(s):  
Energy Source ◽  
Plasma Membranes ◽  
Epithelial Transport ◽  
Electrical Coupling ◽  
Primary Energy ◽  
Electrogenic Pump ◽  
Transport Mechanisms ◽  
Conceptual Foundation ◽  
Transport Pathways

The Ussing model has long provided the conceptual foundation for understanding epithelial transport mechanisms energized by the Na+-K+-ATPase. Plasma membranes may also use the vacuolar (V-type) H+-ATPase as the primary energy source of membrane and epithelial transport. A pure electrogenic pump, the V-type H+-ATPase energizes not only membranes it inhabits but also other transport pathways via electrical coupling.

scholarly journals Magnetic Properties and AC Losses in AFe2O4(A = Mn, Co, Ni, Zn) Nanoparticles Synthesized from Nonaqueous Solution

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Oleksandr Yelenich ◽  
Sergii Solopan ◽  
Taras Kolodiazhnyi ◽  
Yuliya Tykhonenko ◽  
Alexandr Tovstolytkin ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Measurements ◽  
Spinel Ferrite ◽  
Blocking Temperature ◽  
Ac Losses ◽  
X Ray Diffraction ◽  
Average Magnetic Moment ◽  
Heating Efficiency ◽  
Cobalt Nickel ◽  
Transmission Electron

Nanosized particles of AFe2O4(A = Mn, Co, Ni, or Zn) spinel ferrites were synthesized by coprecipitation from nonaqueous solutions using nitrate salts as starting reagents. The particles were characterized by X-ray diffraction, transmission electron microscopy, and magnetic measurements. Quasistatic magnetic measurements show superparamagnetic behavior with blocking temperature below room temperature for cobalt, nickel, and zinc spinel ferrite nanoparticles. Characteristic magnetic parameters of the particles including average magnetic moment of an individual nanoparticle and blocking temperature have been determined. The specific loss power which is released on the exposure of an ensemble of synthesized particles to a magnetic field is calculated and measured experimentally. It is shown that among all nanoferrites under study, the ZnFe2O4nanoparticles demonstrate the highest heating efficiency in AC magnetic fields. The key parameters responsible for the heating efficiency in AC magnetic field have been determined. The directions to enhance the SLP value have been outlined.

Physical Properties of Isolated Perfused Renal Tubular Basement Membranes

1971 ◽  
Vol 29 ◽  
pp. 390-391
Author(s):  
Jared Grantham ◽  
Larry Welling
Keyword(s):  
Basement Membrane ◽  
Basement Membranes ◽  
Transport Mechanisms ◽  
Permeability Characteristics ◽  
Peritubular Capillaries ◽  
Strategic Location ◽  
Tubular Lumen ◽  
Glomerular Filtrate ◽  
Urine Formation ◽  
Renal Tubular

In the course of urine formation in mammalian kidneys over 90% of the glomerular filtrate moves from the tubular lumen into the peritubular capillaries by both active and passive transport mechanisms. In all of the morphologically distinct segments of the renal tubule, e.g. proximal tubule, loop of Henle and distal nephron, the tubular absorbate passes through a basement membrane which rests against the basilar surface of the epithelial cells. The basement membrane is in a strategic location to affect the geometry of the tubules and to influence the movement of tubular absorbate into the renal interstitium. In the present studies we have determined directly some of the mechanical and permeability characteristics of tubular basement membranes.

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