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Mn Interstitial Diffusion in (Ga, Mn)As

Description: This article describes a combined theoretical and experimental study of the ferromagnetic semiconductor (Ga, Mn)As which explains the remarkably lard changes observed on low-temperature annealing.
Date: January 23, 2004
Creator: Edmonds, Kevin; Boguslawski, Piotr; Wang, K. Y.; Campion, Richard Paul; Novikov, Sergei; Farley, N. R. S. et al.
Partner: UNT College of Arts and Sciences
open access

Rapid Analysis of Legume Root Nodule Development Using Confocal Microscopy

Description: This article discusses the rapid analysis of legume root nodule development using confocal microscopy.
Date: 2004
Creator: Haynes, Janine G.; Czymmek, Kirk J.; Carlson, Carol A.; Veereshlingam, Harita; Dickstein, Rebecca & Sherrier, D. Janine
Partner: UNT College of Arts and Sciences
open access

Relation between structural and optical properties of InN andInxGa1-xN thin films

Description: Transmission Electron Microscopy (TEM) and opticalmeasurements obtained from InN and In1-xGaxNfilms (0<x<0.54)grown by Molecular Beam Epitaxy are presented. Energy gaps measuredbyabsorption, PR, and PL for InN films grown on c-plane Al2O3 were in therange of 0.7 eV. No In or otherinclusions were observed in these films,ruling out the possibility of a strong Mie scattering mechanism. IntheIn1-xGaxN films the relationship between the structural properties andthe optical properties, inparticular t… more
Date: July 20, 2004
Creator: Liliental-Weber, Z.; Zakharov, D. N.; Jasinski, J.; Yu, K. M.; Wu, J. W.; Ager, J. W., III et al.
Partner: UNT Libraries Government Documents Department
open access

Soft X-ray synchrotron radiation investigations of actinidematerials systems utilizing X-ray emission spectroscopy and resonantinelastic X-ray scattering

Description: Synchrotron radiation (SR) methods have been utilized with increasing frequency over the past several years to study topics in actinide science, ranging from those of a fundamental nature to those that address a specifically-targeted technical need. In particular, the emergence of microspectroscopic and fluorescence-based techniques have permitted investigations of actinide materials at sources of soft x-ray SR. Spectroscopic techniques with fluorescence-based detection are useful for actinide … more
Date: January 3, 2004
Creator: Shuh, D.K.; Butorin, S.M.; Guo, J.-H. & Nordgren, J.
Partner: UNT Libraries Government Documents Department
open access

Hohlraum-driven ignition-like double-shell implosions on the Omega laser facility

Description: High-convergence ignition-like double-shell implosion experiments have been performed on the Omega laser facility [T.R. Boehly et al., Opt. Commun. 133, 495 (1997)] using cylindrical gold hohlraums with 40 drive beams. Repeatable, dominant primary (2.45 MeV) neutron production from the mix-susceptible compressional phase of a double-shell implosion, using fall-line design optimization and exacting fabrication standards, is experimentally inferred from time-resolved core x-ray imaging. Effective… more
Date: October 1, 2004
Creator: Amendt, P.; Robey, H. F.; Park, H. S.; Tipton, R. E.; Turner, R. E.; Milovich, J. L. et al.
Partner: UNT Libraries Government Documents Department
open access

Performance characteristics of a cosmology package on leading HPCarchitectures

Description: The Cosmic Microwave Background (CMB) is a snapshot of the Universe some 400,000 years after the Big Bang. The pattern of anisotropies in the CMB carries a wealth of information about the fundamental parameters of cosmology. Extracting this information is an extremely computationally expensive endeavor, requiring massively parallel computers and software packages capable of exploiting them. One such package is the Microwave Anisotropy Dataset Computational Analysis Package (MADCAP) which has be… more
Date: January 1, 2004
Creator: Carter, Jonathan; Borrill, Julian & Oliker, Leonid
Partner: UNT Libraries Government Documents Department
open access

qSF wavefront triplication in a transversely isotropicmaterial

Description: Triplication of a wavefront, also classically known as birefringence, can and does occur in transversely isotropic (TI) media. With the growing interest in shear waves, and in particular, converted shear waves, it becomes necessary to study this phenomenon, and the bright spots that accompany it. In a plane that includes the medium's rotational symmetry axis, there may exist a range of angles within which the qSV wave, whose polarization lies in that plane, may propagate at three distinct veloc… more
Date: June 1, 2004
Creator: Schoenberg, Michael & Daley, Thomas M.
Partner: UNT Libraries Government Documents Department
open access

The dihadron fragmentation function and its evolution

Description: Dihadron fragmentation functions and their evolution arestudied in the process of e+e- annihilation. Under the collinearfactorization approximation and facilitated by the cut-vertex technique,the two hadron inclusive cross section at leading order (LO) is shown tofactorize into a short distance parton cross section and a long distancedihadron fragmentation function. We provide the definition of such adihadron fragmentation function in terms of parton matrix elements andderive its DGLAP evolutio… more
Date: February 24, 2004
Creator: Majumder, Abhijit & Wang, Xin-Nian
Partner: UNT Libraries Government Documents Department
open access

Scheduling in Heterogeneous Grid Environments: The Effects of DataMigration

Description: Computational grids have the potential for solving large-scale scientific problems using heterogeneous and geographically distributed resources. However, a number of major technical hurdles must be overcome before this goal can be fully realized. One problem critical to the effective utilization of computational grids is efficient job scheduling. Our prior work addressed this challenge by defining a grid scheduling architecture and several job migration strategies. The focus of this study is to… more
Date: January 1, 2004
Creator: Oliker, Leonid; Biswas, Rupak; Shan, Hongzhang & Smith, Warren
Partner: UNT Libraries Government Documents Department
open access

Proc. Agent 2004 Conf. on Social Dynamics : Interaction, Reflexivity and Emergence

Description: I'd like to welcome you to the Agent 2004 conference. As most of you are aware, this conference is the fifth in a series of meetings that began in 1999. A conference followed the next year in 2000. The 2001 conference was skipped because of some conflicts with other conferences, and the conferences have proceeded annually since then. We have the proceedings of the previous conferences available here on CDs. One CD has the proceedings from 1999, 2000, and 2002; the other contains last year's pro… more
Date: January 1, 2004
Creator: C. M. Macal, D. Sallach, M. J. North, eds.
Partner: UNT Libraries Government Documents Department
open access

Two Dimensional Simulations of Plastic-Shell, Direct-Drive Implosions on OMEGA

Description: Multidimensional hydrodynamic properties of high-adiabat direct-drive plastic-shell implosions on the OMEGA laser system [T. R. Boehly et al., Opt. Commun. 133, 495 (1997)] are investigated using the multidimensional hydrodynamic code, DRACO. Multimode simulations including the effects of nonuniform illumination and target roughness indicate that shell stability during the acceleration phase plays a critical role in determining target performance. For thick shells that remain integral during th… more
Date: September 27, 2004
Creator: Radha, P. B.; Goncharov, V. N.; Collins, T. B.; Delettrez, J. A.; Elbaz, Y.; Glebov, V. Y. et al.
Partner: UNT Libraries Government Documents Department
open access

Low-frequency asymptotic analysis of seismic reflection from afluid-saturated medium

Description: Reflection of a seismic wave from a plane interface betweentwo elastic media does not depend on the frequency. If one of the mediais poroelastic and fluid-saturated, then the reflection becomesfrequency-dependent. This paper presents a low-frequency asymptoticformula for the reflection of seismic plane p-wave from a fluid-saturatedporous medium. The obtained asymptotic scaling of the frequency-dependentcomponent of the reflection coefficient shows that it is asymptoticallyproportional to the sq… more
Date: April 14, 2004
Creator: Silin, D.B.; Korneev, V.A.; Goloshubin, G.M. & Patzek, T.W.
Partner: UNT Libraries Government Documents Department
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