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 665 for “"Sn"”.
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Low temperature specific heat of Sn and Sn-In alloys
The normal state specific heats of pure tin and alloys consisting of 0.5, 1, 2, 4, and 6 atomic percent indium in tin have been measured between about 0.4 and 4. 2 oK. All of the alloys lie within the solid solubility limit of indium in tin. Measurements were made in an adiabatic calorimeter cooled …
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Sn attenuation in the Northeast China
… in northeast China is presented. Regional phase Sn wave is used to map lateral variations of shear wave Q. This method allows us to measure, in some detail, to map the effective shear wave attenuation for the uppermost mantle. Eventually these kind of measurements could be used in determining …
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Infrarotemission der SN 1987A nach 11 Jahren
Anhand von Beobachtungen der SN 1987A im mittleren Infrarot, die mit dem Infrared Space Observatory (ISO) 11 Jahre nach dem Supernovaausbruch durchgefuehrt wurden, wird die moegliche Staubemisson der in der Supernova gebildeten Kondensate und der schon vorher vorhandenen zirkumstellaren …
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Surface layer formation on Pb/Sn alloys
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1995.
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Novel approaches to low temperature transient liquid phase bonding in the In-Sn/Cu and In-Sn-Bi/Cu systems
… and 75°C using interlayer alloys from the In-Sn and In-Sn-Bi systems. Using thermodynamic models, three different compositions (wt. %) of base alloys were chosen to accomplish this task: 50In-43.6Sn-6.4Bi (Tm = 110°C) and eutectic 50.9In-49.1Sn (Tm = 120°C) alloys were used for bonding at …
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Synthesis and Characterization of Pt-Ru-Sn Catalysts
<p>Magnesia-supported trimetallic Pt-Ru-Sn catalysts prepared through a cluster and a conventional synthetic route have been investigated in terms of their structural properties and their catalytic activity for the hydrogenation of citral and crotonaldehyde. FTIR results indicate that the majority …
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The study of the complexation of Sn(ii)-APDDMP and Sn(iv)-PEIMP, considered as potential therapeutic agents for bone metastases
Includes bibliographical references (leaves 103-104).
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Characterization of Nb₃Sn superconducting strand under pure bending
… 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 laws …
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An Sn Application of Homotopy Continuation in Neutral Particle Transport
The objective of this dissertation is to investigate the usefulness of homotopy continuation applied in the context of neutral particle transport where traditional methods of acceleration degrade. This occurs in higher dimensional heterogeneous problems [51]. We focus on utilizing homotopy …
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Micro/Nano-Scale Investigation on SN Alloys and SNO2 Nanowires
<p>Tin (Sn) and its alloys have been at people's service since 3000 BC when bronze (alloy of tin and copper) was produced in large scale. They have unique properties and find applications in various engineering fields. Correspondingly, there is abundant information waiting to be clarified …
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Wettability of low Sn solders on integrated circuit package metallizations
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1983.
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FIR filter design using Jacobian elliptic Sn function with wavelet applications.
This thesis presents a new method of digital FIR filter design based on the Jacobian elliptic sine function. In addition to a general design, a special result is obtained for Quadrature Mirror Filters (QMF) for use in multi-resolution filter banks. These are called Quasi-Dyadic FIR filters. Most of …
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Optical anisotropy and vibrational properties of Sn, In, and Cs nanowires
… von Quantendrähten aus den Metallen Sn, In und Cs mit Hilfe der Reflexions Anisotropie Spektroskopie (RAS), sowie zusätzlich deren Schwingungsmoden mit der Ramanspektroskopie untersucht. Die durch selbstorganisiertes Wachstum des metallischen Materials auf sauberen …
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Pourbaix diagrams at elevated temperatures: a study of Zn and Sn
… safety. For instance, zircaloy (1.2-1.7 wt.% Sn) fuel rods are exposed to aqueous 250-310 oC coolant in CANDU reactors. The Pourbaix (EH-pH) diagram is a plot of electrochemical potential versus pH, which shows the domains of various metal species and by inference, corrosion susceptibility. …
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Massenspektrometrie kurzlebiger Sr- und Sn-Isotope und Aufbau der SHIPTRAP-Penningfallen
… bestimmt. Für den doppeltmagischen Kern ^132 Sn konnte zum ersten Mal die Masse auf direkte Weise bestimmt werden. ^76 Sr ist nun der schwerste N=Z-Kern, dessen Masse genauer als 50 keV bekannt ist. Die ISOLTRAP-Werte für die Massen der untersuchten Nuklide werden mit anderen Werten …
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High-Sn-content GeSn Alloy towards Room-temperature Mid Infrared Laser
… a wide range of applications. Group-IV alloy GeSn has drawn great attentions as a complementary metal–oxide–semiconductor compatible optoelectronic material for Si photonics. The devices based on GeSn alloy could be monolithically integrated into well-established and high-yield Si integrated …
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Phase stability and formation in the Cu-Zn-Sn-S system
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2020-05-01
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The milling of tin bronze with a Cu-24.6wt%Sn composition
… on tin bronze with the composition Cu-24.6wtSn have been examined using hardness testing, optical microscopy, scanning electron microscopy, transmission electron microscopy and x-ray diffraction. High energy milling has caused mechanical alloying of an elemental copper and tin powder blend, …
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