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 41 for “"samarium"”.
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Strontium and samarium diffusion in diopside
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Sciences, 1982.
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Magnetic properties of samarium-cobalt and cobalt-platinum.
Thesis: B.S., Massachusetts Institute of Technology, Department of Materials Science and Engineering, 1976
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Apparatus for the lifetime measurement of Samarium excited states
… measurement of the lifetime of the 9F1 level of Samarium by the Hanle effect ... A technique known as Optogalvanic spectroscopy was used to calibrate the laser wavelength ... A new method for the detection of the atomic beam of some materials is presented.
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Microstructural changes in plasma sprayed samarium cobalt permanent magnets.
Thesis. 1975. Sc.D.--Massachusetts Institute of Technology. Dept. of Materials Science and Engineering.
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Dynamic Nuclear Polarization in Samarium Doped Lanthanum Magnesium Nitrate
… nuclei by the solid effect in single crystals of samarium doped lanthanum magnesium nitrate (Sm:LMN) has been studied theoretically and experimentally. The equations of evolution governing the dynamic nuclear polarization by the solid effect have been derived in detail using the spin temperature …
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Samarium strontium cobalt oxide – samarium doped ceria carbonate (SSC-SDCC) as a new potential composite cathode material for low temperature solid oxide fuel cell
Systematic research regarding SSC-SDC carbonate (SSC-SDCC) as composite cathode is limited despite great chemical compatibility and cell performance achieved with other low temperature solid oxide fuel cell (LTSOFC) components. LTSOFC based on SDCC electrolyte display lower of area specific …
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Microstructure and Texture of Yttrium-Nickel-Borocarbide and Samarium-Cobalt Thin Films
… and texture of Yttrium-Nickel- Borocarbide and Samarium-Cobalt thin film heterostructures prepared by Pulsed Laser Deposition and to establish structure-property relations for these materials in order to improve their properties and design new structures. Coincidence site lattice epitaxy was …
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Evaluation of alkali and alkaline earth doped samarium oxide catalysts for the oxidative coupling of methane
… this thesis consisted of preparing and testing samarium oxide and alkali (Na and K) and alkaline earth (Mg and Ca) doped samarium oxide catalysts for the oxidative coupling of methane. The effects of the specific dopant used, varying dopant concentration (1:100 and 1:10 dopant:Sm mole ratio), …
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Solidification, microstructure and mechanical properties of mg-nd-gd-zn-zr cast magnesium alloy with yttrium, erbium and samarium additions
… effect of alloying elements Yttrium, Erbium and Samarium addition on the solidification characteristics, microstructure and mechanical properties of as-cast Mg-Nd-Gd-Zn-Zr magnesium alloy. The future automotive and aerospace industries will experience tremendous progress if magnesium alloys …
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Analysis of Chemical Elements in Basalts using Mislabeled Data, a Machine Learning Approach
… (Ho), <a href="https://en.wikipedia.org/wiki/Samarium" target="_blank">Samarium</a> (Sm), and <a href="https://en.wikipedia.org/wiki/Erbium" target="_blank">Erbium</a> (Er). The data used for the exploration contained many outliers. Therefore, an ensemble model was created to explore the …
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Terrestrial magma ocean solidification and formation of a candidate D" layer
… is enriched in incompatible elements such as samarium and neodymium regardless of distribution coefficients used for incompatible elements in mantle minerals such as perovskite. However, we found that this probable D" layer is more enriched in samarium than is to be expected for a planet's …
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Quantitative Photoacoustic Reaction-Rate Measurements Under Microcomputer Control
… addition, a quantitative calibration curve for samarium oxide was prepared by simply mixing controlled particle size distributions of samarium oxide and barium sulfate.
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High magnetic field study of strongly correlated electron systems
… measurements on the Kondo insulator samarium hexaboride. Shubnikov-de Haas oscillations observed in the former further our understanding of the nature of the normal states of these high temperature superconductors, crucial to unravel the origin of unconventional superconductivity in …
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Optimization of the MgS:Eu:Sm phosphor for potential use as an optically stimulated personnel dosimeter
Magnesium sulfide activated with europium and samarium is a candidate phosphor for laser stimulated personnel dosimeters. Optically stimulated luminescence (OSL) dosimeters are advantageous in that they provide a faster, isothermal dose measurement than conventional thermoluminescent dosimeters. …
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Radiation Damage in Permanent Magnet Lenses
… Studies on magnet samples suggest that Samarium Cobalt is at least a thousand times more radiation-tolerant and should be used as a replacement for NdFeB in magnetic lenses for high-dose proton radiography.
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Oscillator strength measurements in singly-ionized, doubly-ionized and neutral lanthanides and transition elements (sm, nd, pr, gd, cu, and fe) using laser-induced breakdown spectroscopy.
… 137 lines from 70 excited states in neutral samarium, 713 lines from 115 excited states in singly-ionized samarium, and 49 lines from 17 excited levels of doubly-ionized samarium. The degree of uncertainty for strong emission lines is 9.3%, for moderate lines 10.3%, and 23.3% for weak …
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An automated monitoring system for the production and measurement of metal fatigue
… This is achieved by attaching small, powerful, samarium-cobalt magnets to the ends of the tynes, enabling them to be driven efficiently by a "U"-core electromagnet. A small, piezoceramic strain gauge provides a method of picking up the vibrations. To maintain resonance, the signal is used in a …
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Anisotropic spin-lattice relaxation times of trivalent rare earth ions in anhydrous lanthanum trichloride
… been made for cerium, praseodymium, neodymium, samarium, terbium, and erbium , in single crystals of anhydrous lanthanum tric~loride. The experiments were performed on samples cqntaining ~ 2 at.% rpre earth doping using pulse-saturation techniques at X-ba~d frequencies. Angular m~asurements at …
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Magnetic studies of epitaxial neodymium
… films exhibit the crystal lattice of elemental samarium, but again at richer Nd concentrations than observed in bulk alloys. The films show magnetic responses that indicate long-range antiferromagnetic ordering occurs at temperatures 50% greater than ordering temperatures of elemental Nd. The …
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