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  • Characterization of Heterostructured Nanocrystalline Metals Processed by High-Pressure Torsion

    Creator:
    Han, Jae-Kyung
    Abstract:
    High-pressure torsion (HPT) is an effective severe plastic deformation (SPD) technique to produce bulk nanostructured materials (BNMs). These BNMs often show a combination of exceptional mechanical and physical properties. Processing of single metals and alloys by HPT has been understood that the homogenous microstructures can be achieved throughout the disk...
    Resource Type:
    Dissertation
    Full Text:
    AN ABSTRACT OF THE DISSERTATION OF Jae-Kyung Han for the degree of Doctor of Philosophy in

  • Synthesis and Analysis of Heterostructural Semiconductor Alloy Sn1-xCaxCh (Ch=S, Se) and Nitrides Zn1-xWxN and Zn1-x(W1-yMoy)xN

    Creator:
    Matthews, Bethany E.
    Abstract:
    This work explores the synthesis and characterization of the metastable alloys Sn1-xCaxCh (Ch= S, Se) and nitride compounds Zn-W-Mo-N, which have recently been predicted by theorists. Single phase thin films of Sn1-xCaxS are prepared by pulsed laser deposition and radio-frequency magnetron sputtering and of Sn1-xCaxSe are prepared by pulsed laser...
    Resource Type:
    Dissertation
    Full Text:
    briefly discussed along with a short example. 1 J.E. Saal, S. Kirklin, M. Aykol, B. Meredig, and C

  • The chemistry and device applications of amorphous thin-film interfaces

    Creator:
    Knutson, Christopher C.
    Abstract:
    Solid-state amorphous materials show amazing promise in thin-film electronics. The interface-to-bulk ratio of thin films makes interfacial chemistries of these systems of utmost importance. Thin films of amorphous metals, dielectrics and semiconductors have novel chemistries that are not only based upon their elemental constituent makeup, but also based upon the...
    Resource Type:
    Dissertation
    Full Text:
    ). (4) Deville, H. S. C. Ann. Chim. Phys. 1854, 43, 31-33. (5) Riordan, M. The Silicon Dioxide

  • Development of organocatalyzed, intramolecular heteroatom Michael addition and application towards alkaloid synthesis

    Creator:
    Carlson, Erik
    Abstract:
    Effective methods for the enantiopure formation of substituted piperidine rings are significantly important due to their presence in alkaloid products. A valuable method to form these ring systems would be via an intramolecular heteroatom Michael addition from the corresponding enone or enal. Described herein is a methodolgy that has been...
    Resource Type:
    Masters Thesis
    Full Text:
    . ["]D +14.2 (c = 0.8, CHCl3), 1H NMR (400 MHz, CDCl3) $ 7.33-7.42 (m, 5H), 5.17 (s, 2H), 4.50-4.60 (m

  • Synthesis and Characterization of an Ultrafine-Grained Aluminum-Copper System through High-Pressure Torsion

    Creator:
    Liang, Guangyuan
    Abstract:
    Aluminum and copper and their alloys have been widely used due to relatively high strength-to-weight ratios compared with conventional steels. Processing of these alloys is typically conducted at high temperatures over extended time periods. High-pressure torsion (HPT) is a promising processing technique for introducing significant grain refinement leading to excellent...
    Resource Type:
    Masters Thesis
    Full Text:
    measurements at strain rates of (a) 1.25 × 10-4 s-1, (b) 2.5 × 10-4 s-1 (c) 5.0 × 10-4 s-1 and (d) 1.0 × 10-3

  • Fabrication of CuInGaSe₂ thin film solar cells using low-cost air-stable inks

    Creator:
    Wang, Wei
    Abstract:
    CuInGaSe₂ (CIGS), a promising thin film solar cell material, has gained lots of attention in decades due to its high energy conversion efficiency and potential lower manufacture cost over conventional Si solar cells. As a cheaper processing method compared to vacuum-based techniques, solution-based deposition has been successfully applied to fabricate...
    Resource Type:
    Dissertation
    Full Text:
    members: Dr. Chong Fang, Dr. Christine Kelly, Dr. Gregory S. Herman, Dr. Brady Gibbons, Dr. Daniel R

  • Structure-Property Relationships of Disordered Electronic Materials : From Crystalline to Amorphous

    Creator:
    Surta, Todd Wesley, Jr.
    Abstract:
    Two perovskite materials (Bi0.5(A)0.5)(Sc0.5Nb0.5)O3, where A = K+ and Na+ were synthesized phase pure for the first time. Their structures were determined by indexing synchrotron X-ray diffraction data and subsequent combined Rietveld refinement on neutron and synchrotron X-ray diffraction data revealing significant disorder on the A-sites of these materials. A...
    Resource Type:
    Dissertation
    Full Text:
    in A = K+, but the tilting of BO6 octahedra along the c-axis was found to be disordered. A 15% tilt

  • Structure-property relationships of layered oxypnictides

    Creator:
    Muir, Sean W.
    Abstract:
    Investigating the structure-property relationships of solid state materials can help improve many of the materials we use each day in life. It can also lead to the discovery of materials with interesting and unforeseen properties. In this work the structure property relationships of newly discovered layered oxypnictide phases are presented...
    Resource Type:
    Dissertation
    Full Text:
    primarily based, Muir, S., Sleight, A.W., Subramanian, M.A., 2010. Mat. Res. Bull. 45, 392–395

  • Power System Planning for Sustainable, Reliable, and Accessible Electricity: Models, Methods, and Metrics

    Creator:
    Cicilio, Phylicia R.
    Abstract:
    Generation resources are shifting from centralized, high inertial, fossil fuel based to decentralized, no inertia, and variable renewable resources. The evolution of generation resources in electrical grids requires the transformation of the electrical grid infrastructure, and operation and planning procedures and standards. This dissertation takes four investigations into how to...
    Resource Type:
    Dissertation
    Full Text:
    ig n T o ol s P ar t 1 [3 –1 1] T o o l P ro d u ce r C os t G en er at io n T y p

  • An Experimental and Numerical Investigation of Tall Mechanically Stabilized Earth Walls

    Creator:
    Strahler, Andrew W.
    Abstract:
    The implementation and construction of Mechanically Stabilized Earth (MSE) walls has undergone substantial expansions in recent years, owing to its relatively low cost, ease of construction, and high efficiency compared to conventional retaining methods. As a result, MSE walls are being constructed to greater heights with complex features (e.g. multiple...
    Resource Type:
    Dissertation
    Full Text:
    ...................................................................278 Appendix C: Design of the Multi-strip Pullout Box