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376 Matching Results
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SPIN-TORQUE IN SYSTEMS WITH INHOMOGENEOUS MAGETIZATION
The work performed during the grant period focused on the phenomenon of spin-transfer torque. This is a quantum mechanical effect whereby the angular momentum of conduction electrons is transferred to the magnetization of ferromagnetic structures. Our work on this subject began with phenomenological drift-diffusion and Landau-Lifshitz-Gilbert equations to demonstrate unambiguously that unpolarized current flow from a nonmagnet into a ferromagnet can produce a precession-type instability of the magnetization. We then used Boltzmann calculations appropriate to spin-valve type magnetic heterostructures composed of a non-magnetic thin film sandwiched between two thin film layers with uniform magnetization. Perhaps our most important paper dealt with quantum and semi-classical calculations of spin-transfer torque in systems with domain walls and other inhomogeneous distributions of magnetization. The latter work caused us to suggest that the Landau-Lifshitz approach to magnetic damping provided a clearer picture of the physics than the more popular (but formally equivalent) Gilbert approach to damping. Finally, we returned to our Boltzmann calculations and made a serious effort to analyze experimental data on current-induced magnetization in switching in magnetic spin-valve structures. Our work was part of a world-wide effort to study and harness the transport of the electron's spin and was one of the first …
Date:
April 23, 2013
Creator:
Zangwill, Andrew
Object Type:
Report
System:
The UNT Digital Library
Systematic Effects in Type-1a Supernovae Surveys from Host Galaxy Spectra
The physical relation between the properties of Type Ia supernovae and their host galaxies is investigated. Such supernovae are used to constrain the properties of dark energy, making it crucial to understand their physical properties and to check for systematic effects relating to the stellar populations of the progenitor stars from which these supernovae arose. This grant found strong evidence for two distinct populations of supernovae, and correlations between the progenitor stellar populations and the nature of the supernova light curves.
Date:
August 23, 2013
Creator:
Strauss, Michael A.
Object Type:
Report
System:
The UNT Digital Library
Long-Term Testing of Rhodium-Based Catalysts for Mixed Alcohol Synthesis – 2013 Progress Report
The U.S. Department of Energy’s Pacific Northwest National Laboratory has been conducting research since 2005 to develop a catalyst for the conversion of synthesis gas (carbon monoxide and hydrogen) into mixed alcohols for use in liquid transportation fuels. Initially, research involved screening possible catalysts based on a review of the literature, because at that time, there were no commercial catalysts available. The screening effort resulted in a decision to focus on catalysts containing rhodium and manganese. Subsequent research identified iridium as a key promoter for this catalyst system. Since then, research has continued to improve rhodium/manganese/iridium-based catalysts, optimizing the relative and total concentrations of the three metals, examining baseline catalysts on alternative supports, and examining effects of additional promoters. Testing was continued in FY 2013 to evaluate the performance and long-term stability of the best catalysts tested to date. Three tests were conducted. A long-term test of over 2300 hr duration at a single set of operating conditions was conducted with the best carbon-supported catalyst. A second test of about 650 hr duration at a single set of operating conditions was performed for comparison using the same catalyst formulation on an alternative carbon support. A third test of about 680 …
Date:
September 23, 2013
Creator:
Gerber, Mark A.; Gray, Michel J. & Thompson, Becky L.
Object Type:
Report
System:
The UNT Digital Library
On High Order Finite-Difference Metric Discretizations Satisfying GCL on Moving and Deforming Grids
None
Date:
May 23, 2013
Creator:
Sjogreen, B.; Yee, H. C. & Vinokur, M.
Object Type:
Report
System:
The UNT Digital Library
A parametric study of BCS RF surface impedance with magnetic field using the Xiao Code
N/A
Date:
September 23, 2013
Creator:
E., Reece C. & B., Xiao
Object Type:
Article
System:
The UNT Digital Library
Cooper Review (Cooper, Tex.), Vol. 133, No. 21, Ed. 1 Thursday, May 23, 2013
Weekly newspaper from Cooper, Texas that includes local, state, and national news along with advertising.
Date:
May 23, 2013
Creator:
Roller, Cindy
Object Type:
Newspaper
System:
The Portal to Texas History
Van Zandt News (Wills Point, Tex.), Vol. 33, No. 7, Ed. 1 Sunday, June 23, 2013
Weekly newspaper from Wills Point, Texas that includes local, state, and national news along with advertising.
Date:
June 23, 2013
Creator:
Vaughan, Julie
Object Type:
Newspaper
System:
The Portal to Texas History
Electra Star-News (Electra, Tex.), Vol. 106, No. 39, Ed. 1 Thursday, May 23, 2013
Weekly newspaper from Electra, Texas that includes local, state, and national news along with advertising.
Date:
May 23, 2013
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Yoakum Herald-Times (Yoakum, Tex.), Vol. 121, No. 4, Ed. 1 Wednesday, January 23, 2013
Weekly newspaper from Yoakum, Texas that includes local, state, and national news along with advertising.
Date:
January 23, 2013
Creator:
McCracken, Michael S.
Object Type:
Newspaper
System:
The Portal to Texas History
De Leon Free Press (De Leon, Tex.), Vol. 123, No. 47, Ed. 1 Thursday, May 23, 2013
Weekly newspaper from De Leon, Texas that includes local, state and national news along with advertising.
Date:
May 23, 2013
Creator:
Kestner, Laura
Object Type:
Newspaper
System:
The Portal to Texas History
Seminole Sentinel (Seminole, Tex.), Vol. 105, No. 7, Ed. 1 Wednesday, October 23, 2013
Semiweekly newspaper from Seminole, Texas that includes local, state, and national news along with advertising.
Date:
October 23, 2013
Creator:
Wright, Dustin
Object Type:
Newspaper
System:
The Portal to Texas History
Palacios Beacon (Palacios, Tex.), Vol. 106, No. 4, Ed. 1 Wednesday, January 23, 2013
Weekly newspaper from Palacios, Texas that includes local, state, and national news along with advertising.
Date:
January 23, 2013
Creator:
West, Bert
Object Type:
Newspaper
System:
The Portal to Texas History
Jackson County Herald-Tribune (Edna, Tex.), Vol. 106, No. 48, Ed. 1 Wednesday, October 23, 2013
Weekly newspaper from Edna, Texas that includes local, state, and national news along with advertising.
Date:
October 23, 2013
Creator:
Lundstrom, Chris
Object Type:
Newspaper
System:
The Portal to Texas History
The Ennis Daily News (Ennis, Tex.), Ed. 1 Thursday, May 23, 2013
Daily newspaper from Ennis, Texas that includes local, state and national news along with advertising.
Date:
May 23, 2013
Creator:
Todaro, Nick
Object Type:
Newspaper
System:
The Portal to Texas History
Jackson County Herald-Tribune (Edna, Tex.), Vol. 106, No. 9, Ed. 1 Wednesday, January 23, 2013
Weekly newspaper from Edna, Texas that includes local, state, and national news along with advertising.
Date:
January 23, 2013
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Ennis Daily News (Ennis, Tex.), Ed. 1 Tuesday, April 23, 2013
Daily newspaper from Ennis, Texas that includes local, state and national news along with advertising.
Date:
April 23, 2013
Creator:
Todaro, Nick
Object Type:
Newspaper
System:
The Portal to Texas History
The Winkler County News (Kermit, Tex.), Vol. 78, No. 20, Ed. 1 Thursday, May 23, 2013
Weekly newspaper from Kermit, Texas that includes local, state and national news along with advertising.
Date:
May 23, 2013
Creator:
Parks, Phil
Object Type:
Newspaper
System:
The Portal to Texas History
Brownwood Bulletin (Brownwood, Tex.), Vol. 113, No. 159, Ed. 1 Tuesday, April 23, 2013
Weekly newspaper from Brownwood, Texas that includes local, state and national news along with advertising.
Date:
April 23, 2013
Creator:
Stuckly, Derrick
Object Type:
Newspaper
System:
The Portal to Texas History
Brownwood Bulletin (Brownwood, Tex.), Vol. 113, No. 135, Ed. 1 Saturday, March 23, 2013
Weekly newspaper from Brownwood, Texas that includes local, state and national news along with advertising.
Date:
March 23, 2013
Creator:
Stuckly, Derrick
Object Type:
Newspaper
System:
The Portal to Texas History
The Stonewall Courier (Aspermont, Tex.), Vol. 26, No. 16, Ed. 1 Thursday, May 23, 2013
Weekly newspaper from Aspermont, Texas that includes local, state, and national news along with advertising.
Date:
May 23, 2013
Creator:
Hodgin, Wayne
Object Type:
Newspaper
System:
The Portal to Texas History
Brownwood Bulletin (Brownwood, Tex.), Vol. 114, No. 8, Ed. 1 Wednesday, October 23, 2013
Weekly newspaper from Brownwood, Texas that includes local, state and national news along with advertising.
Date:
October 23, 2013
Creator:
Stuckly, Derrick
Object Type:
Newspaper
System:
The Portal to Texas History
Brownwood Bulletin (Brownwood, Tex.), Vol. 113, No. 112, Ed. 1 Saturday, February 23, 2013
Weekly newspaper from Brownwood, Texas that includes local, state and national news along with advertising.
Date:
February 23, 2013
Creator:
Stuckly, Derrick
Object Type:
Newspaper
System:
The Portal to Texas History
Brownwood Bulletin (Brownwood, Tex.), Vol. 113, No. 86, Ed. 1 Wednesday, January 23, 2013
Weekly newspaper from Brownwood, Texas that includes local, state and national news along with advertising.
Date:
January 23, 2013
Creator:
Stuckly, Derrick
Object Type:
Newspaper
System:
The Portal to Texas History
Denton Record-Chronicle (Denton, Tex.), Vol. 109, No. 355, Ed. 1 Tuesday, July 23, 2013
Daily newspaper from Denton, Texas that includes local, state, and national news along with advertising.
Date:
July 23, 2013
Creator:
Cobb, Dawn
Object Type:
Newspaper
System:
The Portal to Texas History