Now showing items 2454-2468 of 2468

    • X-ray and neutron diffraction investigations of the structural phase transformation sequence under electric field in 0.7Pb(Mg1/3Nb2/3)-0.3PbTiO(3) crystal 

      Bai, Feiming; Wang, Naigang; Li, Jiefang; Viehland, Dwight D.; Gehring, Peter M.; Xu, Guangyong; Shirane, Gen (American Institute of Physics, 2004-08-01)
      The structural phase transformations of 0.7Pb(Mg1/3Nb2/3)O-3-0.3PbTiO(3) (PMN-30%PT) have been studied using x-ray diffraction (XRD) and neutron scattering as a function of temperature and electric field. We observe the ...
    • X-ray and XPS studies of evaporated cuxs thin-films 

      Uppal, P. N.; Burton, Larry C. (American Institute of Physics, 1983-04-01)
      The structural changes in Cu x S films have been monitored by x_ray diffraction and correlated to the chemical changes taking place on the Cu x S surface, the latter monitored by XPS. The results show: evaporated Cu x S ...
    • X-ray diffraction study of the pressure-induced bcc-to-hcp phase transition in the highly magnetostrictive Fe0.81Ga0.19 alloy 

      Ahart, Muhtar; Devreugd, Christopher P.; Li, Jiefang; Viehland, Dwight D.; Gehring, Peter M.; Hemley, Russell J. (American Physical Society, 2013-11-07)
      High-pressure x-ray diffraction measurements were performed at room temperature on single crystals of the highly magnetostrictive alloy Fe0.81Ga0.19 (galfenol). This alloy has a bcc crystal structure at ambient pressure ...
    • X-ray Grating-based Imaging - Waves Work Wonderfully 

      Wang, Ge (2008-06-17)
      Current x-ray imaging is of critical for clinical and pre-clinical applications but it is fundamentally restricted by the attenuation mechanism. X-ray grating-based imaging represents outstanding opportunities and major ...
    • XcisClique: analysis of regulatory bicliques 

      Pati, Amrita; Vasquez-Robinet, Cecilia; Heath, Lenwood S.; Grene, Ruth; Murali, T. M. (2006-04-21)
      Abstract Background Modeling of cis-elements or regulatory motifs in promoter (upstream) regions of genes is a challenging computational problem. In this work, set of regulatory motifs simultaneously present in the promoters ...
    • XML for ETDs 

      Prabhune, Aniket; Fox, Edward A. (Department of Computer Science, Virginia Polytechnic Institute & State University, 2002), TR-02-28
    • An XML Log Standard and Tool for Digital Library Logging Analysis 

      Goncalves, Marcos A.; Luo, Ming; Shen, Rao; Ali, Mir Farooq; Fox, Edward A. (2002-09-01)
      Log analysis can be a primary source of knowledge about how digital library patrons actually use DL systems and services and how systems behave while trying to support user information seeking activities. Log recording and ...
    • X‐ray diffraction analysis of concentration and residual stress gradients in nitrogen‐implanted niobium and molybdenum 

      Rao, Satish I.; He, Baoping; Houska, Charles R.; Grabowski, Kenneth (American Institute of Physics, 1991-06-15)
      Large biaxial residual strains are developed after a 5-at.% implantation of N into Nb and Mo. The results indicate that the dominant source of internal strain arises from N located in interstitial sites. For Nb implanted ...
    • X‐ray diffraction approach to grain boundary and volume diffusion 

      Unnam, Jalaiah; Carpenter, Joseph A.; Houska, Charles R. (American Institute of Physics, 1973)
      A generalized two‐dimensional diffusionmodel has been developed which consists of an array of boundaries coupled to the free surface and to the substrate lattice. The model makes use of three nonlinear partial differential ...
    • X‐ray diffraction from d spacing gradients along ion‐implanted zones 

      Rao, Satish I.; Houska, Charles R. (American Institute of Physics, 1991-06-15)
      Three kinematic diffraction models are described for interpreting diffraction profiles from ion-implanted samples. Each deals with relatively large d spacing gradients. The first treats the full zone as coherent which ...
    • X‐ray diffuse scattering from a nitrogen‐implanted niobium film 

      Rao, Satish I.; Houska, Charles R.; Grabowski, Kenneth; Ice, Gene E.; Sparks, C. J. (American Institute of Physics, 1991-06-15)
      A 2500-angstrom niobium single-crystal film was deposited onto a sapphire substrate and subsequently implanted with nitrogen to an average concentration of 0.5 at. %. Synchrotron radiation was used to measure the difference ...
    • An x‐ray study of diffusion in the Cu‐Ag system 

      Unnam, Jalaiah; Houska, Charles R. (American Institute of Physics, 1976)
      The interdiffusion coefficients for both solid phases of the Ag‐Cu system have been determined from x‐ray diffraction and electron microprobe data. Specimens containing 3.2 μm of Ag on a (111) ‐oriented Cu crystal were ...
    • You've Got Mail! Calendar, Weather and More: Customizable Phone Access to Personal Information 

      Pérez-Quiñones, Manuel A.; Rode, Jochen (Department of Computer Science, Virginia Polytechnic Institute & State University, 2004), TR-04-21
    • Young's modulus and hysteretic losses of 0.7Pb(Mg1/3Nb2/3)O-3-0.3PbTiO(3): single versus polycrystalline forms 

      Viehland, Dwight D.; Li, Jiefang (American Institute of Physics, 2003-12-15)
      Young's modulus (Y) of 0.7Pb(Mg1/3Nb2/3)O-3-0.3PbTiO(3) has been investigated for polycrystals and single crystals oriented along <001>, <110>, and <111>. The value of Y-<001> and Y-<110> for single crystals was dramatically ...
    • Zro2 Thin-Film-Based Sapphire Fiber Temperature Sensor 

      Wang, Jiajun; Lally, Evan M.; Wang, Xiaoping; Gong, Jianmin; Pickrell, Gary R.; Wang, Anbo (Optical Society of America, 2012-10-01)
      A submicrometer-thick zirconium dioxide film was deposited on the tip of a polished C-plane sapphire fiber to fabricate a temperature sensor that can work to an extended temperature range. Zirconium dioxide was selected ...