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14,914 Matching Results
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Parallel Detonation Shock Dynamics Algorithm for Insensitive Munitions using ALE3D
None
Date:
March 28, 2011
Creator:
Pfau, D.; Najjar, F.; McCandless, B.; Yao, J. & Nichols, A., III
Object Type:
Article
System:
The UNT Digital Library
Age-related changes in the plasticity and toughness of human cortical bone at multiple length-scales
The structure of human cortical bone evolves over multiple length-scales from its basic constituents of collagen and hydroxyapatite at the nanoscale to osteonal structures at nearmillimeter dimensions, which all provide the basis for its mechanical properties. To resist fracture, bone’s toughness is derived intrinsically through plasticity (e.g., fibrillar sliding) at structural-scales typically below a micron and extrinsically (i.e., during crack growth) through mechanisms (e.g., crack deflection/bridging) generated at larger structural-scales. Biological factors such as aging lead to a markedly increased fracture risk, which is often associated with an age-related loss in bone mass (bone quantity). However, we find that age-related structural changes can significantly degrade the fracture resistance (bone quality) over multiple lengthscales. Using in situ small-/wide-angle x-ray scattering/diffraction to characterize sub-micron structural changes and synchrotron x-ray computed tomography and in situ fracture-toughness measurements in the scanning electron microscope to characterize effects at micron-scales, we show how these age-related structural changes at differing size-scales degrade both the intrinsic and extrinsic toughness of bone. Specifically, we attribute the loss in toughness to increased non-enzymatic collagen cross-linking which suppresses plasticity at nanoscale dimensions and to an increased osteonal density which limits the potency of crack-bridging mechanisms at micron-scales. The link between these …
Date:
August 10, 2011
Creator:
Zimmermann, Elizabeth A.; Schaible, Eric; Bale, Hrishikesh; Barth, Holly D.; Tang, Simon Y.; Reichert, Peter et al.
Object Type:
Article
System:
The UNT Digital Library
Modeling pulsed-laser melting of embedded semiconductor nanoparticles
Pulsed-laser melting (PLM) is commonly used to achieve a fast quench rate in both thin films and nanoparticles. A model for the size evolution during PLM of nanoparticles confined in a transparent matrix, such as those created by ion-beam synthesis, is presented. A self-consistent mean-field rate equations approach that has been used successfully to model ion beam synthesis of germanium nanoparticles in silica is extended to include the PLM process. The PLM model includes classical optical absorption, multiscale heat transport by both analytical and finite difference methods, and melting kinetics for confined nanoparticles. The treatment of nucleation and coarsening behavior developed for the ion beam synthesis model is modified to allow for a non-uniform temperature gradient and for interacting liquid and solid particles with different properties. The model allows prediction of the particle size distribution after PLM under various laser fluences, starting from any particle size distribution including as-implanted or annealed simulated samples. A route for narrowing the size distribution of embedded nanoparticles is suggested, with simulated distribution widths as low as 15% of the average size.
Date:
May 18, 2011
Creator:
Sawyer, C. A.; Guzman, J.; Boswell-Koller, C. N.; Sherburne, M. P.; Mastandrea, J. P.; Bustillo, K. C. et al.
Object Type:
Article
System:
The UNT Digital Library
Nanocoatings for High-Efficiency Industrial Hydraulic and Tooling Systems
Industrial manufacturing in the U.S. accounts for roughly one third of the 98 quadrillion Btu total energy consumption. Motor system losses amount to 1.3 quadrillion Btu, which represents the largest proportional loss of any end-use category, while pumps alone represent over 574 trillion BTU (TBTU) of energy loss each year. The efficiency of machines with moving components is a function of the amount of energy lost to heat because of friction between contacting surfaces. The friction between these interfaces also contributes to downtime and the loss of productivity through component wear and subsequent repair. The production of new replacement parts requires additional energy. Among efforts to reduce energy losses, wear-resistant, low-friction coatings on rotating and sliding components offer a promising approach that is fully compatible with existing equipment and processes. In addition to lubrication, one of the most desirable solutions is to apply a protective coating or surface treatment to rotating or sliding components to reduce their friction coefficients, thereby leading to reduced wear. Historically, a number of materials such as diamond-like carbon (DLC), titanium nitride (TiN), titanium aluminum nitride (TiAlN), and tungsten carbide (WC) have been examined as tribological coatings. The primary objective of this project was the development …
Date:
January 7, 2011
Creator:
Higdon, Clifton B., III
Object Type:
Report
System:
The UNT Digital Library
Enabling graphene nanoelectronics.
Recent work has shown that graphene, a 2D electronic material amenable to the planar semiconductor fabrication processing, possesses tunable electronic material properties potentially far superior to metals and other standard semiconductors. Despite its phenomenal electronic properties, focused research is still required to develop techniques for depositing and synthesizing graphene over large areas, thereby enabling the reproducible mass-fabrication of graphene-based devices. To address these issues, we combined an array of growth approaches and characterization resources to investigate several innovative and synergistic approaches for the synthesis of high quality graphene films on technologically relevant substrate (SiC and metals). Our work focused on developing the fundamental scientific understanding necessary to generate large-area graphene films that exhibit highly uniform electronic properties and record carrier mobility, as well as developing techniques to transfer graphene onto other substrates.
Date:
September 1, 2011
Creator:
Pan, Wei; Ohta, Taisuke; Biedermann, Laura Butler; Gutierrez, Carlos; Nolen, C. M.; Howell, Stephen Wayne et al.
Object Type:
Report
System:
The UNT Digital Library
Evidence for Direct CP Violation in the Measurement of the Cabibbo-Kobayashi-Maskawa Angle gamma with B-+ to D(*) K(*)-+ Decays
We report the measurement of the Cabibbo-Kobayashi-Maskawa CP-violating angle {gamma} through a Dalitz plot analysis of neutral D meson decays to K{sub S}{sup 0}{pi}{sup +}{pi}{sup -} and K{sub S}{sup 0} K{sup +}K{sup -} produced in the processes B{sup {-+}} {yields} DK{sup {-+}}, B{sup {-+}} {yields} D* K{sup {-+}} with D* {yields} D{pi}{sup 0}, D{gamma}, and B{sup {-+}} {yields} DK*{sup {-+}} with K*{sup {-+}} {yields} K{sub S}{sup 0}{pi}{sup {-+}}, using 468 million B{bar B} pairs collected by the BABAR detector at the PEP-II asymmetric-energy e{sup +}e{sup -} collider at SLAC. We measure {gamma} = (68 {+-} 14 {+-} 4 {+-} 3){sup o} (modulo 180{sup o}), where the first error is statistical, the second is the experimental systematic uncertainty and the third reflects the uncertainty in the description of the neutral D decay amplitudes. This result is inconsistent with {gamma} = 0 (no direct CP violation) with a significance of 3.5 standard deviations.
Date:
August 19, 2011
Creator:
del Amo Sanchez, P.; Lees, J. P.; Poireau, V.; Prencipe, E.; Tisserand, V.; Garra Tico, J. et al.
Object Type:
Article
System:
The UNT Digital Library
Search for b-->u transitions in B- --> DK- and B- --> D*K- Decays
We report results from an updated study of the suppressed decays B{sup -} --> DK{sup -} and B{sup -} --> D*K{sup -} followed by D --> K{sup +}{pi}{sup -}, where D{sup (*)} indicates a D{sup (*)0} or a {anti D}{sup (*)0} meson, and D{sup *} --> D{tau}{sup 0} or D{sup *} --> D{gamma}. These decays are sensitive to the CKM unitarity triangle angle {gamma} due to interference between the b --> c transition B{sup -} --> D{sup (*)0}K{sup -} followed by the double Cabibbo-suppressed decay D{sup 0} --> K{sup +}{pi}{sup -}, and the b --> u transition B{sup -} --> {anti D}{sup (*)0}K{sup -} followed by the Cabibbo-favored decay {anti D}{sup 0} --> K{sup +}{pi}{sup -}. We also report an analysis of the decay B{sup -} --> D{sup (*)}{pi}{sup -} with the D decaying into the doubly Cabibbo-suppressed mode D --> K{sup +}{pi}{sup -}. Our results are based on 467 million {Upsilon}(4S) --> B{anti B} decays collected with the BABAR detector at SLAC. We measure the ratios R{sup (*)} of the suppressed ([K{sup +}{pi}{sup -}]{sub D}K{sup -}/{pi}{sup -}) to favored ([K{sup -}{pi}{sup +}]{sub D}K{sup -}/{pi}{sup -}) branching fractions as well as the CP asymmetries A{sup (*)} of those modes. We …
Date:
August 11, 2011
Creator:
del Amo Sanchez, P.; Lees, J. P.; Poireau, V.; Prencipe, E.; Tisserand, V.; Garra Tico, J. et al.
Object Type:
Article
System:
The UNT Digital Library
Study of B to X \gamma Decays and Determination of |V_{td}/V_{ts}|
Using a sample of 471 million B{bar B} events collected with the BABAR detector, we study the sum of seven exclusive final states B {yields} X{sub s(d){gamma}}, where X{sub s(d)} is a strange (non-strange) hadronic system with a mass of up to 2.0 GeV/c{sup 2}. After correcting for unobserved decay modes, we obtain a branching fraction for b {yields} d{gamma} of (9.2 {+-} 2.0(stat.) {+-} 2.3(syst.)) x 10{sup -6} in this mass range, and a branching fraction for b {yields} s{gamma} of (23.0 {+-} 0.8(stat.) {+-} 3.0(syst.)) x 10{sup -5} in the same mass range. We find {Beta}(b{yields}d{gamma})/{Beta}(b{yields}s{gamma}) = 0.040 {+-} 0.009(stat.) {+-} 0.010(syst.), from which we determine |V{sub td}/V{sub ts}| = 0.199 {+-} 0.022(stat.) {+-} 0.024(syst.) {+-} 0.002(th.).
Date:
August 22, 2011
Creator:
del Amo Sanchez, P.; Lees, J. P.; Poireau, V.; Prencipe, E.; Tisserand, V.; Garra Tico, J. et al.
Object Type:
Article
System:
The UNT Digital Library
Search for B+ meson decay to a1+ K*0
We present a search for the decay B{sup +} --> {alpha}{sup +}{sub 1}(1260)K*{sup 0}(892). The data, collected with the BABAR detector at the SLAC National Accelerator Laboratory, represent 465 million B{anti B} pairs produced in e{sup +}e{sup -} annihilation at the energy of the {Upsilon}(4S). We find no significant signal and set an upper limit at 90% confidence level on the product of branching fractions B(B{sup +} --> {alpha}{sup +}{sub 1}(1260)K*{sup 0}(892)) x B({alpha}{sup +}{sub 1}(1260) --> {pi}{sup +}{pi}{sup -}{pi}{sup +}) of 1.8 x 10{sup -6}.
Date:
August 11, 2011
Creator:
del Amo Sanchez, P.; Lees, J. P.; Poireau, V.; Prencipe, E.; Tisserand, V.; Garra Tico, J. et al.
Object Type:
Article
System:
The UNT Digital Library
Pre-Conceptual Design of a Fluoride-Salt-Cooled Small Modular Advanced High Temperature Reactor (SmAHTR)
This document presents the results of a study conducted at Oak Ridge National Laboratory during 2010 to explore the feasibility of small modular fluoride salt-cooled high temperature reactors (FHRs). A preliminary reactor system concept, SmATHR (for Small modular Advanced High Temperature Reactor) is described, along with an integrated high-temperature thermal energy storage or salt vault system. The SmAHTR is a 125 MWt, integral primary, liquid salt cooled, coated particle-graphite fueled, low-pressure system operating at 700 C. The system employs passive decay heat removal and two-out-of-three , 50% capacity, subsystem redundancy for critical functions. The reactor vessel is sufficiently small to be transportable on standard commercial tractor-trailer transport vehicles. Initial transient analyses indicated the transition from normal reactor operations to passive decay heat removal is accomplished in a manner that preserves robust safety margins at all times during the transient. Numerous trade studies and trade-space considerations are discussed, along with the resultant initial system concept. The current concept is not optimized. Work remains to more completely define the overall system with particular emphasis on refining the final fuel/core configuration, salt vault configuration, and integrated system dynamics and safety behavior.
Date:
February 1, 2011
Creator:
Greene, Sherrell R; Gehin, Jess C; Holcomb, David Eugene; Carbajo, Juan J; Ilas, Dan; Cisneros, Anselmo T et al.
Object Type:
Report
System:
The UNT Digital Library
Thermal Analysis of the Divertor Primary Heat Transfer System Piping During the Gas Baking Process
A preliminary analysis has been performed examining the temperature distribution in the Divertor Primary Heat Transfer System (PHTS) piping and the divertor itself during the gas baking process. During gas baking, it is required that the divertor reach a temperature of 350 C. Thermal losses in the piping and from the divertor itself require that the gas supply temperature be maintained above that temperature in order to ensure that all of the divertor components reach the required temperature. The analysis described in this report was conducted in order to estimate the required supply temperature from the gas heater.
Date:
February 1, 2011
Creator:
Yoder, Graydon L., Jr.; Harvey, Karen & Ferrada, Juan J
Object Type:
Report
System:
The UNT Digital Library
Intermediate Blends Infrastructure Materials Compatibility Study
None
Date:
March 1, 2011
Creator:
Kass, Michael D.; Janke, Christopher James; Pawel, Steven J; Lewis, Samuel Arthur, Sr. & Theiss, Timothy J
Object Type:
Report
System:
The UNT Digital Library
Iraq: Politics, Governance, and Human Rights
This Congressional Research Service Report for Congress details political transitions, elections, and related governance issues pertaining to Iraq.
Date:
December 6, 2011
Creator:
Katzman, Kenneth
Object Type:
Report
System:
The UNT Digital Library
Iran: U.S. Concerns and Policy Responses
This CRS Report for Congress contains descriptions of U.S. policy response, legislation, and sanctions pertaining to Iran. Updated April 7, 2011.
Date:
April 7, 2011
Creator:
Katzman, Kenneth
Object Type:
Report
System:
The UNT Digital Library
Iran: U.S. Concerns and Policy Responses
This CRS Report for Congress contains descriptions of U.S. policy response, legislation, and sanctions pertaining to Iran. November 15, 2011.
Date:
November 15, 2011
Creator:
Katzman, Kenneth
Object Type:
Report
System:
The UNT Digital Library
Iraq: Politics, Governance, and Human Rights
This Congressional Research Report for Congress describes political transitions, first elections, political infighting, and related governance issues pertaining to Iraq.
Date:
August 9, 2011
Creator:
Katzman, Kenneth
Object Type:
Report
System:
The UNT Digital Library
Iran: U.S. Concerns and Policy Responses
This CRS Report for Congress contains descriptions of U.S. policy response, legislation, and sanctions pertaining to Iran. Updated June 9, 2011.
Date:
June 9, 2011
Creator:
Katzman, Kenneth
Object Type:
Report
System:
The UNT Digital Library
Questions and Answers About: Status and Trends of Wetlands in the Conterminous United States 2004 to 2009
A paper which offers questions and answers about wetlands.
Date:
September 28, 2011
Creator:
U.S. Fish and Wildlife Service
Object Type:
Report
System:
The UNT Digital Library
CR News, Volume 16, Number 4, October-December 2011
Quarterly newsletter of the Texas Department of Public Safety Crime Records Division discussing news and activities of the organization as well as other information related to crime records and other safety issue within Texas, along with a departmental directory.
Date:
October 2011
Creator:
Texas. Crime Records Division.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Intelligence Issues for Congress
None
Date:
October 5, 2011
Creator:
Best, Richard A. Jr.
Object Type:
Report
System:
The UNT Digital Library
Intelligence Issues for Congress
None
Date:
June 14, 2011
Creator:
Best, Richard A. Jr.
Object Type:
Report
System:
The UNT Digital Library
Intelligence Issues for Congress
None
Date:
April 28, 2011
Creator:
Best, Richard A. Jr.
Object Type:
Report
System:
The UNT Digital Library
Intelligence Issues for Congress
None
Date:
June 21, 2011
Creator:
Best, Richard A. Jr.
Object Type:
Report
System:
The UNT Digital Library
The Keystone, Fall 2011
Semiannual newsletter of the Special Collections at the Texas State University Alkek Library discussing news, and events related to the Collections' staff, acquisitions, exhibitions, and other relevant topics.
Date:
Autumn 2011
Creator:
Wittliff Collections (Albert B. Alkek Library)
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History