A5053046374- Physics of Superconductivity and Magnetism
- Superconducting Materials and Applications
- Advanced Condensed Matter Physics
- Magnetic properties of thin films
- Superconductivity in MgB2 and Alloys
- Magnetic and transport properties of perovskites and related materials
- Iron-based superconductors research
- Magneto-Optical Properties and Applications
- Magnetic Properties and Applications
- High-pressure geophysics and materials
- Theoretical and Computational Physics
- Surface and Thin Film Phenomena
- Medieval European Literature and History
- Magnetic Properties of Alloys
- HVDC Systems and Fault Protection
- Characterization and Applications of Magnetic Nanoparticles
- Gold and Silver Nanoparticles Synthesis and Applications
- Electrohydrodynamics and Fluid Dynamics
- Mycobacterium research and diagnosis
- Copper Interconnects and Reliability
- Rare-earth and actinide compounds
- Quantum and electron transport phenomena
- Basque language and culture studies
- Energetic Materials and Combustion
- Advancements in Semiconductor Devices and Circuit Design
South China University of Technology
2025
Guizhou Minzu University
2025
Suzhou Municipal Hospital
2024
Nanjing Medical University
2024
Anhui University of Science and Technology
2024
Chinese People's Armed Police General Hospital
2023
Chinese People's Armed Police Force
2023
University of Wisconsin System
1987-2005
University of Wisconsin–Madison
1995-2005
International Superconductivity Technology Center
1990-2001
An important predicted, but so far uncharacterized, property of the new superconductor MgB2 is electronic anisotropy arising from its layered crystal structure. Here we report on three c-axis oriented thin films, showing that upper critical field ratio Hc2par/Hc2perp 1.8 to 2.0, increasing with higher resistivity. Measurements magnetic field-temperature phase diagram show flux pinning disappears at H* ~ 0.8Hc2perp(T) in untextured samples. Hc2par(0) strongly enhanced by alloying 39 T for...
Samples of YBa2Cu3O7 have been prepared with rather sharp inductive transitions having in the best cases breadths 7 K and midpoint Tc values 88 K. The resistive midpoints are 92–95 transition widths ±1–2 Flux shielding at 4.2 is normally 100% flux expulsion reaches 95%. However, even small fields order 1 mT decouple some 15%–20% volume, allowing to enter samples. Resistive Hc2 measurements suggest that Hc2(0) varies from <1 >300 T, depending on criterion chosen. ac...
The authors have fabricated bulk samples of high-Tc oxide superconductors with narrow inductive Tc transitions ( approximately 3 K) and low resistivities rho (100 K):250-1000 mu Omega cm). They find such to improved transport critical current density (Jct) properties. Although Jct decreases rapidly increasing field for fields <1 T, is then independent over the range 2-15 T at 4.2 K; 77 K dependence also much reduced. about same whether applied parallel or perpendicular field. high-field...
Locality is an important foundation of local characteristics and image, encompassing the natural qualities inherent cultural features a place. Researching process mechanism behind reconstruction locality in Miao silver ornament, under context tourism development, holds significant importance for inheritance protection intangible heritage. This article based on theory locality, utilize grounded to interview transcript data find that: (1) Tourism has transformed ornaments Qiandongnan from...
We have observed anomalous voltage excursions as a function of temperature and magnetic field in samples Y-Ba-Cu-O above 100 K. These transient voltages are attributed to flux jumps which characteristic granular superconductors. The dependence the effect strongly supports this interpretation. conclude that there exists grains sample with superconducting transition temperatures at least high 160
The commonly observed linear sections in the voltage - current characteristics of Ag-sheathed BSCCO-2212 and BSCCO-2223 composites were studied. One source such is due to ohmic losses silver at feed points. Characteristic transfer lengths are order millimetres 4.2 K tenths 77 K. However, components can also be well away from These found associated with regions locally reduced critical current, which provoke local excess into Ag, thus producing local, V I characteristics. Because finite...
Overpressure (OP) processing otherwise fully treated, commercial Ag-sheathed multifilament (Bi,Pb)2Sr2Ca2Cu3Ox (2223) composite conductors increased the critical current density Jc (0.1 T, 77 K) by 37% to 30.8 kA/cm2 and self-field (SF, 69.6 kA/cm2. These improvements were obtained on full-size high such that Ic reached 80.6 A 181.7 A, even though there was a very strong suppression of Ic. Estimated values for non-self-field-limited (0 235 90 Scanning electron microscopy superconducting...
The connectivity and flux pinning components of the critical current density Jc in a high-Jc Ag-clad, 19-filament (Bi,Pb)2Sr2Ca2Cu3Ox(Bi-2223) composite throughout important steps its thermomechanical treatment were investigated by mass measurement, microstructural observation extensive superconducting property characterization. mechanical integrity filaments was greatest after first heat treatment, because damage produced intermediate rolling not completely erased subsequent treatment....
Processing (Bi,Pb)/sub 2/Sr/sub 2/Ca/sub 2/Cu/sub 3/O/sub x/ (Bi-2223) tape by the oxide-powder-in-tube technique normally includes two heat treatments and one intermediate rolling. A three-step treatment was applied for second (HT2). Experimental procedures were designed understanding roles of each processing step in HT2 post anneal. It found that annealing improved critical temperature T/sub c/, current density J/sub c/ flux pinning characteristic field H/sub p/. The midpoint raised from...
Abstract To study the effect of internal particle size on microstructure properties and thermal decomposition characteristics site mixed emulsion explosive at different altitudes. Site was prepared with shear rate. The size, viscosity, sensitized bubbles, detonation velocity peak pressure were tested after stored simulated matrix three rotational speeds measured by thermogravimetric analyzer kinetic analysis performed non-isothermal model Kissinger–Akah–Sunose (KAS) method. results show that...
${\mathrm{Pb}}_{0.4}$${\mathrm{Bi}}_{1.6}$${\mathrm{Sr}}_{2}$${\mathrm{CaCu}}_{2}$${\mathrm{O}}_{8+\mathit{x}}$ [Bi(Pb)-2212] single-crystal samples were studied using transmission electron microscopy (TEM), ab-plane (${\mathrm{\ensuremath{\rho}}}_{\mathit{a}\mathit{b}}$) and c-axis (${\mathrm{\ensuremath{\rho}}}_{\mathit{c}}$) resistivity, high-resolution angle-resolved ultraviolet photoemission spectroscopy (ARUPS). TEM reveals that the modulation in b axis for Pb(0.4)-doped Bi(Pb)-2212 is...
We have measured and analyzed both the static dynamic contribution to anomalous nonmonotonic dependence of irreversible magnetization, M(B), for underdoped ${\mathrm{Bi}}_{2}$${\mathrm{Sr}}_{2}$${\mathrm{CaCu}}_{2}$${\mathrm{O}}_{8+\mathit{y}}$ overdoped (${\mathrm{Bi}}_{1.6}$${\mathrm{Pb}}_{0.4}$)${\mathrm{Sr}}_{2}$${\mathrm{CaCu}}_{2}$${\mathrm{O}}_{8+\mathit{y}}$ single crystals. extracted ``unrelaxed'' magnetization ${\mathit{M}}_{\mathit{c}}$(B) traced time evolution M(B,t) from short...
We observed pronounced peaks in the critical-current density ${J}_{b}(B)$ versus applied magnetic field $B$ ${\mathrm{YBa}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{7\mathrm{\ensuremath{-}}\mathrm{\ensuremath{\delta}}}$ bicrystals well above lower critical field. These correspond to fields for which spacing between intragrain vortices is commensurate with wavelength of periodic grain boundary facet structure same bicrystals. The were on a group boundaries that isolated from four bulk [001]-tilt...
The transport properties of eight individual bicrystals in melt-textured YBa/sub 2/Cu/sub 3/O/sub 6+x/ were investigated low and high fields at 4 K 77 K. Bicrystals cut from samples produced by the melt texture process with 10% 20% added Y/sub 2/BaCuO/sub 5/. Misorientations between crystals determined pole figure analysis, backscatter channeling patterns light microscopy. exhibited a wide range misorientations both ab planes c-axis direction all boundaries angle. Contrary to many reported...