Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 69 for “"high T"”.
-
Josephson Interferometry Measurements in High-T(c) Grain Boundary Junctions
… formed at grain boundary interfaces in the high-Tc cuprate materials. The inherent properties of these Josephson junctions depend strongly on the pairing symmetry and the electronic structure at the interface and can be used to determine the pairing symmetry as well as the structure of the …
-
Light Scattering Studies of Heavy Fermion and High T(c) Superconductors
… diverse excitation spectra of heavy fermion and high T$\sb{\rm c}$ superconductors.
-
A low temperature calorimetric study of several high-T(c) superconductors
Sintered powders of La$\sb{1.85}$Ba$\sb{0.15}$CuO$\sb4$, La$\sb{1.8}$Sr$\sb{0.2}$CuO$\sb4$, YBa$\sb2$Cu$\sb3$O$\sb{\rm7-x}$, and GdBa$\sb2$Cu$\sb3$O$\sb{\rm 7-x}$ were prepared by solid state reaction. The samples were carefully characterized for impurities by x-ray diffraction and Raman …
-
[mu]SR measurement of the magnetic penetration depth and coherence length in the high-T superconductor YBa₂Cu₃O₆ 95
… and the Ginzburg-Landau parameter K A/e in the high temperature superconductor YBa2Cu306.95 as observed by OR measurements of the local field inhomogeneity produced by the vortex state. Measurements were taken on a mosaic of single crystals in applied fields in three field regimes: low (A < L), …
-
Stability of High-Temperature Superconducting Conductors Using the Finite Element Method
… is one of the most promising approaches. Because high-temperature (high-$T\sb{c}$) superconductors can maintain superconducting properties in much higher magnetic fields than low-temperature superconductors, their use in fusion magnet designs may be preferred. An important issue for high-$T\sb{c}$ …
-
Calculation of the optical conductivity for the Anderson impurity model using the slave boson technique
… mass enhancement is f ound to be large while a t high t emperatures, the mass enhancement is sma ll. The conductivity i s f ound to be Drude like with frequency dependent effective mass and scattering time for low independent effective mass and temperatures and scattering time f requency for high …
-
Processing Effects on (110K) Phase Development and Properties in Bismuth-Strontium-Calcium-Copper-Oxygen Superconducting System
The high T$\sb{\rm c}$ (110K) $\rm Bi\sb2Sr\sb2Ca\sb2Cu\sb3O\sb{x}$ (2223) phase was prepared by distributed liquid phase sintering of combined oxide precursors, $\rm Bi\sb2O\sb3.2SrO$ and (2CaO + 3CuO) from a starting composition of (2.8 224). The samples were characterized using four point probe …
-
Processing and microstructural characterization of a lithium doped and undoped polycrystalline bismuth(2) strontium(2) calcium copper(2) oxygen(x)
The high T$\sb{\rm c}$ superconducting oxide Bi$\sb2$Sr$\sb2$CaCu$\sb2$O$\sb{\rm x}$ (Bi2212) is very promising for the magnet and device applications.
-
Magnetism in strongly correlated electron systems
… in strongly correlated electron systems, the high-T$\sb{c}$ materials and heavy fermions.
-
The Hall effect in untwinned single-crystal superconducting yttrium barium(2) copper(3) oxygen(7-y)
… YBa$\sb2$Cu$\sb3$O$\sb{\rm 7-y}$, a high-T$\sb{\rm c}$ superconductor. The crystals were grown using a technique that we invented, in which untwinned domains are produced naturally without applying stress to the sample.
-
Electron microscopy studies in electrical ceramics: Dielectric composites and high critical temperature superconductors
… was also extended to recent developments in high T$\sb{\rm c}$ ceramic superconductors in the Bi-Ca-Sr-Cu oxide system.
-
Oxygen-17 nuclear magnetic resonance studies of high-temperature superconductors
… and magnetically oriented samples of various high-$T\sb{c}$ superconductors. Systems under investigation include: (BaK)BiO$\sb3$, La$\sb{1.85}$Sr$\sb{0.15}$CuO$\sb4$, YBa$\sb2$Cu$\sb3$O$\sb{\rm 7-x}$, Bi$\sb2$Sr$\sb2$CaCu$\sb2$O$\sb8$ and Tl$\sb2$Ba$\sb2$CaCu$\sb2$O$\sb8$. Measurements of the …
-
Maternal thyroid hormones in Japanese quail eggs
… in embryos from eggs of hens given the highest dose of T₄. Specifically, alkaline phosphatase activity (a marker of differentiation) and pelvic cartilage weights were significantly greater in embryos from high T₄ eggs than in controls. However, chicks from high T₄ eggs did not have …
-
Processing-property relationships for high critical temperature ceramic superconductors in the bismuth-calcium-strontium-copper-oxygen system
This thesis reports research on high T$\sb{\rm c}$ Bi-Ca-Sr-Cu-O (BCSC) superconductors. The BCSC family of superconductors has three known superconducting phases: Bi$\sb2$Sr$\sb2$Cu$\sb1$O$\sb6$ (abbreviated as 2021, with a reported T$\sb{\rm c}$ of 22 K), Bi$\sb2$Ca$\sb1$Sr$\sb2$Cu$\sb2$O$\sb8$ …
-
Solid state nuclear magnetic resonance spectroscopic studies of quadrupolar nuclei in inorganic systems and determination of optical parameters in optical waveguides
… (and related systems), and the copper-free high T$\sb{\rm c}$ superconductor (Ba$\sb{0.6}$K$\sb{0.4}$BiO$\sb3$), and related systems. Overall, I have tried to use solid-state NMR to give new information about structure in a variet of interesting and important conducting compounds, …
-
Markers of Prognosis in Neurodegenerative Dementia
… with DLB PDD. Results: I. Patients with very high T-tau levels performed worse on cognitive tests at baseline, and exhibited a more rapid cognitive decline during follow up. Very high T-tau levels were also associated with a deviating cognitive profile characterized by symptoms from the medial …
-
Mineral equilibria constraints on open-system melting and consequences of melt loss in metabasic rocks
… within orogenic metamorphic terranes, and the high temperature (T), suprasolidus behaviour of these lithologies provide an important contribution to the process of internal differentiation in the continental crust. The recent development of thermodynamic activity-composition (a-x) relations for …
-
High-temperature superconductivity in a family of iron pnictide materials
… worked to design a variety of methods to create high-quality samples of various Iron Pnictide superconductors, to dope them with various chemicals and to characterise the resulting crystalline samples. I discuss in depth the signature of good quality crystals and the various experiments that they …
-
Strain heterogeneity during creep of Carrara marble
… localized in bands spanning several grains. At high T, strain is more localized along grain boundaries. Furthermore, the wavelength of heterogeneities decreases to a quarter of the grain size, in parallel with an increase in their amplitude. This evolution is also seen at a grain scale and is …
Page 1 of 4