Now showing items 19048-19067 of 19159

    • X-56A Dart: Dynamically-Scaled Aircraft for Research and Testing

      Shkarayev, Sergey; Bether, Rosanna Renee; Greenberg, Phillip; Powell, Harry; Grembowski, Brianna; Drozd, Kristofer (The University of Arizona., 2015)
      The X-56A DART: Dynamically-scaled Aircraft for Research and Testing is a project where our team was tasked with creating a half-size dynamically scaled working model of the X-56A MUTT (Multi Utility Technological Testbed), a research aircraft operated by NASA and developed by Lockheed Martin. We were tasked with not only developing the exact 50% scale model, but also the creation of a straight wing version of the aircraft with the same aerodynamic characteristics. In order to accomplish this, a tail was added, the wing span and chord length investigated, and the internals and landing gear designed from scratch. For support of the internals and to absorb the loads experienced by the plane during all aspects of flight, a "stress grid" was devised and made from balsa wood, carbon fiber, and fiberglass. To solve the issue that NASA had with landing gear positioning during takeoff and because of the changing center of gravity for different planforms of the DART, a sliding track mechanism was developed for the main landing gear. Finally, construction of the straight-wing plane was started. Molds were designed and cut for the aircraft, and the fuselage was successfully constructed out of fiberglass.
    • X-Ray Beaming and Mass Transfer in HZ Her

      Strittmatter, P. A.; Scott, J. S.; Whelan, J. A. J.; Wickramasinghe, D. T.; Univ Arizona, Steward Observ (Steward Observatory, The University of Arizona (Tucson, Arizona), 1973)
      The optical and X -ray properties of HZ Her are analyzed within the framework of a model in which the primary is illuminated by X -ray radiation from a degenerate secondary companion. System parameters are derived on the basis of a simplified model and yield a minimum distance to HZ Her of - 5 kpc. It is shown that the X -ray pulses and 35 day on -off characteristics as well as the shape and modulation of the optical light curve can be understood if (i) the primary is illuminated by X -ray emitted in a beam fixed in a rotating neutron star secondary undergoing forced precession and (ii) energy is supplied by mass transfer from primary to secondary resulting in the formation of a disc around the X -ray source which contributes significantly to the total light.
    • X-Ray Crystallographic Studies of Dyrk1a, a Kinase Linked to Down Syndrome

      Montfort, William; Gomez Casarez, Axel Omer (The University of Arizona., 2017)
      Down syndrome (DS) is a chromosomal aberration that causes learning disability and neurodegeneration. Previous studies suggest that the overexpression of the dual-specificity tyrosine phosphorylation-regulated kinase 1A (DYRK1A) contributes to the early onset of DS symptoms. This study was conducted to find key binding interactions between DYRK1A and both AMP-PNP and the novel inhibitor DYR219. X-ray quality crystals of DYRK1A-AMPPNP and preliminary crystals of DYRK1A-DYR219 complexes were obtained. The crystal structure of the DYRK1A-AMPPNP complex was determined at a resolution of 2.7 Å. The structure identifies residues involved in the binding of AMP-PNP. Ser169, Glu239, and Leu241 form a hydrogen bond network with the ATP analogue. Asn292 and Asp307 coordinate the AMP-PNP molecule via a Mg#$ ion. Finally, a hydrophobic pocket binds the adenine ring of the AMP-PNP molecule. The structure of the DYRK1A-AMPPNP complex was compared with other DYRK1A structures to identify differences in conformation of the protein and ligand binding. ATP binding sites for various kinases from the CMGC group were also compared to identify similarities and differences in the ATP pocket. The structure of the DYRK1A-AMPPNP complex showed a distinct conformation at residue Phe170 and movement in the activation loop. Successful crystallization of the DYRK1A-DYR219 complex should result in a crystal structure and will enable detailed characterization of binding of DYR219 in the ATP pocket. These data are fundamental for the designing of new potent DYRK1A inhibitors.
    • XOS: A SERVICE FOR DEPLOYING VPNS IN THE CLOUD

      Hartman, John H.; MOWERY, JEREMY DALE (The University of Arizona., 2016)
      XOS is an Everything as a Service operating system designed for the modern 1 cloud that uses the OpenStack platform. XOS makes it easy to create and deploy new cloud services. For this project I developed two new services for XOS, the first a tutorial service that is used as a framework for the current tutorial documentation for XOS, and a OpenVPN service that allows operators to create new VPNs using OpenVPN. The OpenVPN service is the subject of this document, it provides an easy to use interface for creating secure VPN servers and adding clients to VPNs. The benefit of using a VPN is security. All computers connected to a VPN can communicate privately and securely in isolation2. In many situations this is useful, such as database servers that should be isolated from a larger network. Future plans for the OpenVPN service are to support replication across multiple sites, adding entire slices as clients to a VPN, and adding an entire service as a client to a VPN. The research for this thesis came primarily from understanding XOS to create the tutorial service, and from understanding OpenVPN and its security requirements including managing a Public Key Infrastructure.
    • XTM-DITA structure at Human-Computer Interaction Service

      Garrido, Piedad; Tramullas, Jesús; Coll, Manuel; Martínez, Francisco; Plaza, Inmaculada (Universidad de Castilla-La Mancha, 2008)
      This work describes a software engine which works with textual documents containing historical information. The purpose of this work three-fold: firstly to show the validity of the developed engine to correctly identify and label the entities of the universe of discourse with a labelled-combined XTM-DITA model. Secondly to analyze the improvements achieved in the interaction between people (users) and computers with a practical application of the designed methodology to a real-world problem in the semantic web area and thirdly to plan its future integration into a traceability system.
    • XYZ (11)

      Flandrau Science Center & Planetarium, University of Arizona (1987)
    • XYZ (12)

      Flandrau Science Center & Planetarium, University of Arizona (1987)
    • XYZ (13)

      Flandrau Science Center & Planetarium, University of Arizona (1987)
    • Y, Ȳ Diagram Analysis of Two-Surface Optical Systems with Zero Third-Order Spherical Aberration

      Powell, Frank M. (Optical Sciences Center, University of Arizona (Tucson, Arizona), 1970-05)
      A y,Ȳ diagram analysis has been made of two -surface optical systems. The surfaces are spherical and are rotationally symmetric about the optical axis. When the systems are normalized and one of the conjugate planes is at infinity, unique relationships exist between the radii and separations of the optical systems and the y,Ȳ diagram parameters. The aberration coefficients are obtained in terms of the first-order constraints of the y,Ȳ diagram. The y,Ȳ diagram parameters of two-surface systems having zero third-order spherical aberration are represented by a one -parameter family of solutions. The pupil position may be obtained by eliminating zero third-order astigmatism. When the two two-surface systems are placed back to back, each system having zero third -order spherical aberration, a free parameter defines the relationship between the two systems.
    • Yanawant Paiute Places and Landscapes in the Arizona Strip: Volume Two Of The Arizona Strip Landscapes and Place Name Study

      Austin, Diane; Dean, Erin; Gaines, Justin; Bureau of Applied Research in Anthropology, University of Arizona (Bureau of Applied Research in Anthropology, University of Arizona, 2005-12-12)
    • Yanawant: Paiute Places and Landscape in the Arizona Strip: Presentation of Findings

      Stoffle, Richard W.; Van Vlack, Kathleen; Carroll, Alex K.; Chmara-Huff, Fletcher; Martinez, Aja; Bureau of Applied Research in Anthropology, University of Arizona (2005)
    • Yanawant: Paiute Places and Landscapes in the Arizona Strip Volume One of the Arizona Strip Landscapes and Place Name Study

      Stoffle, Richard W.; Van Vlack, Kathleen; Carroll, Alex; Chmara-Huff, Fletcher; Martinez, Aja; Bureau of Applied Research in Anthropology, University of Arizona (Bureau of Applied Research in Anthropology, University of Arizona, 2005)
    • yard fence v west

      Towner, Ronald H.; Laboratory of Tree-Ring Research, University of Arizona (2007-05-21)
    • Yavapai County Annual Narrative Report, from December 1, 1958 to November 30, 1959

      University of Arizona. Agricultural Extension Service. County Agricultural Agents.; Allen, Alvin; Hughes, Lucinda E. (University of Arizona, 1959)
    • Yavapai County Annual Narrative Report, from December 1, 1959 to November 30, 1960

      University of Arizona. Agricultural Extension Service. County Agricultural Agents.; Allen, Alvin; Ashby, Leland E., Jr.; Hughes, Lucinda E. (University of Arizona, 1960)
    • Yavapai County Annual Narrative Report, from December 1, 1960 to November 30, 1961

      University of Arizona. Agricultural Extension Service. County Agricultural Agents.; Allen, Alvin; Hughes, Lucinda E. (University of Arizona, 1961)
    • Yavapai County Annual Narrative Report, from December 1, 1961 to December 31, 1962

      University of Arizona. Agricultural Extension Service. County Agricultural Agents.; Allen, Alvin; Hughes, Lucinda E. (University of Arizona, 1962)
    • Yavapai County Annual Narrative Report, from December 1, 1962 to December 31, 1963

      University of Arizona. Agricultural Extension Service. County Agricultural Agents. (University of Arizona, 1963)
    • Yavapai County Annual Narrative Report, from January 1, 1964 to December 31, 1964

      University of Arizona. Agricultural Extension Service. County Agricultural Agents. (University of Arizona, 1964)
    • Yavapai County Annual Narrative Report, from January 1, 1965 to December 31, 1965

      University of Arizona. Agricultural Extension Service. County Agricultural Agents.; Allen, Alvin; Brittingham, Katherine L. (University of Arizona, 1965)