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.
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Showing 1 to 20 of 619 for “"Nb"”.
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Planar tunneling spectroscopy of thin-film Nb, Nb/normal metal and Nb/semiconductor structures
… on high-quality, DC-magnetron sputter deposited Nb on single-crystal sapphire. The DC resistivity was measured as a function of ternperature to evaluate the film quality and determine Tc. The critical temperature was found to monotonically decrease with decreasing thickness, consistent with …
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Superconductivity in low-dimensional Nb nanostructures
L'abstract è presente nell'allegato / the abstract is in the attachment
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Simultaneous oxidation/sulfidation of Cr-Nb alloys
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1994.
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Video annotation for choreographers on the NB platform
The NB Platform, originally developed to host discussion on class materials, has been adapted to suit the needs of dance choreographers. A Video Annotator was developed, and features requested by choreographers were added to help suit the platform to their needs. The updated annotator was then …
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Rapidly solidified Nb-Al powder : production and characterization
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1991.
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Resistivity in Thinfilm PD/H and NB/H Systems
Made available in DSpace on 2017-07-06T18:55:42Z (GMT). No. of bitstreams: 3 Onumah_Henrietta_E_E_MS.pdf: 10771234 bytes, checksum: 1916231d8bf13c8b5f88e264f85bce36 (MD5) Onumah_Henrietta_E_E_MS_ABS.pdf: 165855 bytes, checksum: 01c8bb6f4723d3a09e3647db24a6f533 (MD5) license.txt: 4813 bytes, …
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Scalable methods for navigating large annotation collections in NB
NB is an online tool where students can annotate readings and lecture notes, while also discussing with other classmates and instructors. Currently, classes that are using NB have hundreds of students, which results in thousands of annotations per document. After discussing with users of NB, and …
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Characterization of Nb₃Sn superconducting strand under pure bending
… the strain-dependent behavior of technological Nb₃Sn superconducting strand has been an important subject of research for the past 25 years. Most of the effort has focused on understanding the uniaxial tension and compression effects and applying this information to improve predictive scaling …
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The properties of amorphous and microcrystalline Ni - Nb alloys.
Thesis: Metal. E., Massachusetts Institute of Technology, Department of Materials Science and Engineering, 1978
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Atomistic simulation of defect structure in Nb-Ti-Al
… ductility. However, a B2 phase in the ternary Nb-Ti-Al system has been discovered which exhibits considerable ductility at room temperature. Three different alloy compositions which exhibit this ductile phase were examined by computer simulation using the Embedded Atom Method. The site …
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Development of NB modified AISI H13/H11 type tool steels
Includes bibliographical references (pages 186-199).
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Bauschinger effect in Nb and V microalloyed line pipe steels
… In this project the microstructure of two Nb- and V-microalloyed steels has been studied with optical, scanning and transmission electron microscopy. The dislocation density and (Ti,Nb,V,Cu)-rich particle diameter, volume fraction and number density were measured for as-rolled and annealed …
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Diffusion of titanium and niobium in b.c.c. Ti-Nb alloys
… simultaneously measured in Ti, Ti94.6, Ti80.4, Nb19.6 and Ti64.3Nb35.7 over the temperature range from 9S0°C to 1511°C using 643 3S standard lathe sectioning techniques. The samples were initially heat treated by annealing above the a-B phase transition temperature and then either cooling slowly …
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Atomistic simulation of deformation induced rotation in Cu-Nb composites
… roll bonding (ARB) of three copper-niobium (Cu-Nb) nano-composite models is simulated using molecular statics techniques to assess the rotational stability of Cu-Nb interfaces at high strains up to 90% thickness reduction. Crystals strain and rotate under compression, and certain Cu-Nb …
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Optimization of the filament size in multifilamentary Nb₃Sn superconducting composite
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1984.
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Template Directed Growth of Nb doped SrTiO₃ using Pulsed Laser Deposition
… For example, niobium doped strontium titanate (SrNbxTi<sub>1-x</sub>O₃ or simply Nb:STO) has a power factor comparable to that of bismuth telluride. Semiconductor nanostructures have demonstrated a decrease in thermal conductivity (κ) resulting in an increase in the thermoelectric figure of merit …
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An ultrasonic study of trapped hydrogen tunneling systems in Nb and Ta
… of trapped hydrogen tunneling systems in Nb and the analogous systems, H in Ta, and D in Nb have been studied with ultrasonic techniques at low temperature. Attenuation due to H in Ta was measured between 0.5 K and 10 K for frequencies between 10 MHz and 55 MHz. The sound velocity change …
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Electrodeposition of Nb, Ta, Zr and Cu from Ionic Liquid for Nanocomposites Preparation
… reactor. Immiscible systems constituted by Cu/Nb or Cu/Ta multilayers exhibit higher thermal stability and improved mechanical properties with respect to bulk Nb, bulk Ta and bulk Cu. Refractory metals present high melting point, high hardness and high resistance against strong acids and bases. …
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Estudo das propriedades supercondutoras de filmes e bicamadas de Nb, Sn e Pb
… filmes de chumbo (Pb), germânio (Ge) e nióbio (Nb) e a tricamada Pb/Ge/Nb na presença de centros de ancoragem. Os centros de ancoragem foram construídos de membrana de alumina porosa (AAO) preenchida com nanofios de níquel (Ni). O crescimento das membranas se deu por meio de processo …
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