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 3311 for “"Fe"”.
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The thermodynamics of the ZnO-Fe₂O₃-Fe₃O₄ system
… in three isothermal sections of the zinc oxide - ferric oxide - magnetite phase diagram, (2) to experimentally determine some of the thermodynamic properties of the zinc oxide - ferric oxide - magnetite system, (3) to use the thermodynamic properties of the zinc oxide - ferric oxide - magnetite …
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Mössbauer spectroscopy of Fe-N and Fe-C solid solutions.
Thesis. 1976. Ph.D.--Massachusetts Institute of Technology. Dept. of Materials Science and Engineering.
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Santa Fe, modelo urbano
… lo que se sabe respecto a la fundación de Santa Fe y su posterior evolución como ciudad, pasando también por el estudio de los edificios históricos que quedaron integrados en la trama de Santa Fe. - El estudio de la fundación de Santa Fe comienza con una introducción histórica, necesaria para …
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Synthesis and characterization of Fe-containing oxide powders and carbon nanotube-Fe-oxide nanocomposites
… PhD research project were firstly to prepare Fe/Al2O3 solid solution powders and foams and Fe/Al6Si2O13 powders and to use them as catalytic materials for the synthesis of CNT-Fe-oxyde nanocomposites, and secondly to perform a profound investigation of all the materials by 57Fe Mössbauer …
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Understanding the [Fe Fe]-Hydrogenase H-Cluster: Insights From Chemical Modelling and Advanced Spectroscopy
… on synthetic mimics of the active site of [Fe Fe]-hydrogenases and explores their reactivity towards protons and electrons. Chapter 1 gives a brief overview of the chemistry taking place in hydogenase enzymes with a particular focus on the [Fe Fe]-hydrogenase. The evolution of synthetic …
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Structural and magnetic characterization of Nd-based Nd-Fe and Nd-Fe-Co-Al metastable alloys
… characterize a metastable hard magnetic phase referred to as "A1" in Nd-Fe alloys, which forms as a part of the fine eutectic depending on the composition and cooling rate. In order to define the range of composition for the formation of A1, Nd100-xFex (x = 20, 25, 40) alloys are cooled …
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The hot working characteristics of Al-0.65% Fe, and Al-0.5% Fe-0.5% Co conductor alloys
Recrystallized, rolled rods of the two conductor alloys were deformed in continuous torsion tests between 200 and 500C̕ and 0.02 and 5 s -1 , and in interrupted torsion tests at 400 and 450C̕, and 0.1 and 1.0 s -1 . The flow stresses were found to depend on the strain rate through a hyperbolic sine …
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Fe pública local i administració electrònica
… funcionaris reservades i, particularment, la fe pública dels secretaris, que és l'objecte d'aquest TFM, són transformades per les noves tecnologies, demandant de la professió una revisió del seu rol en els municipis, on, sovint, se'ls atribueix funcions de caràcter directiu.La finalitat de la …
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Organometallic Chemistry in Fe–S Clusters
The organometallic chemistry of Fe–S clusters has emerged as a new area in Fe–S enzyme biochemistry. In particular, alkylated [Fe₄S₄] clusters are now thought to be important intermediates in several classes of enzymes, including radical S-adenosyl-L-methionine (SAM) enzymes and enzymes involved in …
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Dielectric reliability and spin dependent transport in Co-Fe-B/MgO/Co-Fe-B magnetic tunnel junctions
… the electrons by a magnetic field. Thus, in ferromagnetic (FM) materials, the motion of an electron depends on its spin orientation with respect to local magnetization. This gives rise to interesting new effects to the field of spintronics. Spintronic effects occur on a length scale in which …
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'For the Hills of Santa Fe': The Texan Santa Fe Expedition of 1841 and the Southwest Market Economy
This thesis examines the ill-fated Texan Santa Fe Expedition of 1841 to analyze the state of a lucrative market network in the Southwest. Cut off from Santa Fe, the hub of the network, Texas struggled economically as an independent nation. Commercially isolated and dealing with near- worthless …
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Promoting student retention in two FE colleges
The central question of this thesis is: How effective are strategies aimed at promoting student retention in Further Education (FE) colleagues? Non-completion is typically the result of combinations of risk factors, including demographic characteristics, financial constraints, students’ motivation, …
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Accurate FE-simulation of three-dimensional microstructures
… simulation results obtained by finite element (FE) computations. It is especially designed to meet the requirements that are present when simulating micro-electro-mechanical systems (MEMS). The software tool aims to improve the solution accuracy of the computed fields from the coupled …
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The effect of hydration state, Fe, and spin state of Fe on the elasticity of mantle minerals at high pressure
… of discrepancies in current studies of the effect of water on elastic properties of wadsleyite. To rule out the systematic errors in the determination of water content measured by different methods, I measured water content of wadsleyite using the Fourier Transform Infrared method. The results …
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Electronic structure and energetics of Fe-based superconductors: Effects of chemical and magnetic disorder in (Ba-X)(Fe-Y)2As2
The Fe-based superconductors (Fe-SCs) have reinvigorated the community of high-Tc researchers worldwide. Like copper-oxide superconductors (Cu-SCs), they are layered compounds in proximity to an antiferromagnetic (AFM) state. The Fe-SC systems are amenable to controlled chemical doping/alloying, …
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Mn(salen)- und Fe(porph)-katalysierte enantioselektive Epoxidierungen
… zu > 95:5). Als Hauptprodukte werden für die offenkettigen Allylalkohole IIa,e,f die threo-konfigurierten Epoxyalkohole III erhalten, während die cyclischen Allylakohole IIb-d die entsprechenden cis-Epoxyalkohole III lieferen. 1,1-Dimethyl-1,2-dihydro-2-naphthol (IIc) ist hierbei eine Ausnahme, …
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