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1,212 Matching Results
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Frustrated spin correlations in diluted spin ice Ho2-xLaxTi2O7
We have studied the evolution of the structural properties as well as the static and dynamic spin correlations of spin ice Ho2Ti2O7, where Ho was partially replaced by non-magnetic La. The crystal structure of diluted samples Ho2-xLaxTi2O7 was characterized by x-ray and neutron diffraction and by Ho L-III-edge and Ti K-edge extended x-ray absorption fine structure (EXAFS) measurements. It is found that the pyrochlore structure remains intact until about x = 0.3, but a systematic increase in local disorder with increasing La concentration is observed in the EXAFS data, especially from the Ti K edge.Quasi-elastic neutron scattering and ac susceptibility measurements show that, in x<= 0.4 samples at temperatures above macroscopic freezing, the spin -spin correlations are short ranged and dynamic in nature. The main difference with pure spin ice in the dynamics is the appearance of a second, faster, relaxation process.
Date:
April 30, 2008
Creator:
Ehlers, Georg; Ehlers, G.; Mamontov, E.; Zamponi, M.; Faraone, A.; Qiu, Y. et al.
Object Type:
Article
System:
The UNT Digital Library
The Clifton Record (Clifton, Tex.), Vol. 113, No. 21, Ed. 1 Wednesday, May 21, 2008
Weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.
Date:
May 21, 2008
Creator:
Smith, W. Leon
Object Type:
Newspaper
System:
The Portal to Texas History
The Clifton Record (Clifton, Tex.), Vol. 113, No. 15, Ed. 1 Wednesday, April 9, 2008
Weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.
Date:
April 9, 2008
Creator:
Smith, W. Leon
Object Type:
Newspaper
System:
The Portal to Texas History
The Clifton Record (Clifton, Tex.), Vol. 113, No. 23, Ed. 1 Wednesday, June 4, 2008
Weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.
Date:
June 4, 2008
Creator:
Smith, W. Leon
Object Type:
Newspaper
System:
The Portal to Texas History
The Clifton Record (Clifton, Tex.), Vol. 113, No. 20, Ed. 1 Wednesday, May 14, 2008
Weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.
Date:
May 14, 2008
Creator:
Smith, W. Leon
Object Type:
Newspaper
System:
The Portal to Texas History
The Clifton Record (Clifton, Tex.), Vol. 113, No. 18, Ed. 1 Wednesday, April 30, 2008
Weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.
Date:
April 30, 2008
Creator:
Smith, W. Leon
Object Type:
Newspaper
System:
The Portal to Texas History
The Clifton Record (Clifton, Tex.), Vol. 113, No. 17, Ed. 1 Wednesday, April 23, 2008
Weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.
Date:
April 23, 2008
Creator:
Smith, W. Leon
Object Type:
Newspaper
System:
The Portal to Texas History
The Clifton Record (Clifton, Tex.), Vol. 113, No. 11, Ed. 1 Wednesday, March 12, 2008
Weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.
Date:
March 12, 2008
Creator:
Smith, W. Leon
Object Type:
Newspaper
System:
The Portal to Texas History
The Clifton Record (Clifton, Tex.), Vol. 113, No. 22, Ed. 1 Wednesday, May 28, 2008
Weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.
Date:
May 28, 2008
Creator:
Smith, W. Leon
Object Type:
Newspaper
System:
The Portal to Texas History
The Clifton Record (Clifton, Tex.), Vol. 113, No. 42, Ed. 1 Wednesday, October 15, 2008
Weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.
Date:
October 15, 2008
Creator:
Smith, W. Leon
Object Type:
Newspaper
System:
The Portal to Texas History
The Clifton Record (Clifton, Tex.), Vol. 113, No. 8, Ed. 1 Wednesday, February 20, 2008
Weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.
Date:
February 20, 2008
Creator:
Smith, W. Leon
Object Type:
Newspaper
System:
The Portal to Texas History
The Clifton Record (Clifton, Tex.), Vol. 113, No. 10, Ed. 1 Wednesday, March 5, 2008
Weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.
Date:
March 5, 2008
Creator:
Smith, W. Leon
Object Type:
Newspaper
System:
The Portal to Texas History
Final Technical Report
Most prokaryotes of interest to DOE are poorly understood. Even when full genomic sequences are available, the function of only a small number of gene products are clear. The critical question is how to best infer the most probable network architectures in cells that are poorly characterized. The project goal is to create a computational hypothesis testing (CHT) framework that combines large-scale dynamical simulation, a database of bioinformatics-derived probable interactions, and numerical parallel architecture data-fitting routines to explore many “what if ?” hypotheses about the functions of genes and proteins within pathways and their downstream effects on molecular concentration profiles and corresponding phenotypes. From this framework we expect to infer signal transduction pathways and gene expression networks in prokaryotes. Detailed mechanistic models of E. Coli have been developed that directly incorporate DNA sequence information. The CHT framework is implemented in the NIEngine network inference software. NIEngine has been applied to recover gene regulatory networks in E. coli to assess performance. Application to Shewanel la oneidensi and other organism of interest DOE will be conducted in partnership with Jim Collin's Lab at Boston University and other academic partners. The CHT framework has also found broad application in the automated learning of …
Date:
October 15, 2008
Creator:
Church, Bruce W
Object Type:
Report
System:
The UNT Digital Library
The Clifton Record (Clifton, Tex.), Vol. 113, No. 5, Ed. 1 Wednesday, January 30, 2008
Weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.
Date:
January 30, 2008
Creator:
Smith, W. Leon
Object Type:
Newspaper
System:
The Portal to Texas History
The Clifton Record (Clifton, Tex.), Vol. 113, No. 39, Ed. 1 Wednesday, September 24, 2008
Weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.
Date:
September 24, 2008
Creator:
Smith, W. Leon
Object Type:
Newspaper
System:
The Portal to Texas History
The Clifton Record (Clifton, Tex.), Vol. 113, No. 9, Ed. 1 Wednesday, February 27, 2008
Weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.
Date:
February 27, 2008
Creator:
Smith, W. Leon
Object Type:
Newspaper
System:
The Portal to Texas History
The Clifton Record (Clifton, Tex.), Vol. 113, No. 2, Ed. 1 Wednesday, January 9, 2008
Weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.
Date:
January 9, 2008
Creator:
Smith, W. Leon
Object Type:
Newspaper
System:
The Portal to Texas History
The Clifton Record (Clifton, Tex.), Vol. 113, No. 24, Ed. 1 Wednesday, June 11, 2008
Weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.
Date:
June 11, 2008
Creator:
Smith, W. Leon
Object Type:
Newspaper
System:
The Portal to Texas History
Final Report PetaScale Application Development Analysis Grant Number DE-FG02-04ER25629
The results obtained from this project will fundamentally change the way we look at computer performance analysis. These results are made possible by the precise definition of a consistent system of measurement with a set of primary units designed specifically for computer performance analysis. This system of units, along with their associated dimensions, allows us to apply the methods of dimensional analysis, based on the Pi Theorem, to define scaling and self-similarity relationships. These relationships reveal new insights into experimental results that otherwise seems only vaguely correlated. Applying the method to cache-miss data revealed scaling relationships that were not seen by those who originally collected the data. Applying dimensional analysis to the performance of parallel numerical algorithms revealed that computational force is a unifying concept for understanding the interaction between hardware and software. The efficiency of these algorithms depends, in a very intimate way, on the balance between hardware forces and software forces. Analysis of five different algorithms showed that performance analysis can be reduced to a study of the differential geometry of the efficiency surface. Each algorithm defines a set of curvilinear coordinates, specific to that algorithm, and different machines follow different paths along the surface depending on the …
Date:
June 20, 2008
Creator:
Numrich, Robert W.
Object Type:
Report
System:
The UNT Digital Library
The Clifton Record (Clifton, Tex.), Vol. 113, No. 4, Ed. 1 Wednesday, January 23, 2008
Weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.
Date:
January 23, 2008
Creator:
Smith, W. Leon
Object Type:
Newspaper
System:
The Portal to Texas History
The Clifton Record (Clifton, Tex.), Vol. 113, No. 32, Ed. 1 Wednesday, August 6, 2008
Weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.
Date:
August 6, 2008
Creator:
Smith, W. Leon
Object Type:
Newspaper
System:
The Portal to Texas History
The Clifton Record (Clifton, Tex.), Vol. 113, No. 40, Ed. 1 Wednesday, October 1, 2008
Weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.
Date:
October 1, 2008
Creator:
Smith, W. Leon
Object Type:
Newspaper
System:
The Portal to Texas History
History and Lore of Cleburne and Johnson County, Texas
Compilation of newspaper articles and personal reminiscences related to the history of Cleburne and the wider Johnson County area.
Date:
2008
Creator:
Watson, John W.
Object Type:
Book
System:
The Portal to Texas History
The Clifton Record (Clifton, Tex.), Vol. 113, No. 12, Ed. 1 Wednesday, March 19, 2008
Weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.
Date:
March 19, 2008
Creator:
Smith, W. Leon
Object Type:
Newspaper
System:
The Portal to Texas History