Access
Partner
UNT Libraries Government Documents Department
595
UNT Libraries
26
UNT Libraries Special Collections
23
Oklahoma Historical Society
21
TCU Mary Couts Burnett Library
14
Sterling Municipal Library
8
UNT College of Arts and Sciences
5
Concordia University Texas
4
National Museum of the Pacific War/Admiral Nimitz Foundation
4
San Antonio Public Library
4
37 More
Collection
Texas Laws and Resolutions Archive
486
Texas Digital Newspaper Program
78
Congressional Research Service Reports
49
Office of Scientific & Technical Information Technical Reports
49
Tocker Foundation Grant
23
Oklahoma Digital Newspaper Program
22
Texas Society Sons of the American Revolution (TXSSAR)
15
Civil Rights in Black and Brown
14
The Greensheet
12
The Baytown Sun
8
74 More
Country
States
Decade
Month
Day
Language
754 Matching Results
Results open in a new window/tab.
Electron and Photon Interactions in the Regime of Strong LPM Suppression
Most searches for ultra-high energy (UHE) astrophysical neutrinos look for radio emission from the electromagnetic and hadronic showers produced in their interactions. The radio frequency spectrum and angular distribution depend on the shower development, so are sensitive to the interaction cross sections. At energies above about 1016 eV (in ice), the Landau-Pomeranchuk-Migdal (LPM) effect significantly reduces the cross sections for the two dominant electromagnetic interactions: bremsstrahlung and pair production. At higher energies, above about 1020 eV, the photonuclear cross section becomes larger than that for pair production, and direct pair production and electronuclear interactions become dominant over bremsstrahlung. The electron interaction length reaches a maximum around 1021 eV, and then decreases slowly as the electron energy increases further. In this regime, the growth in the photon cross section and electron energy loss moderates the rise in nu e shower length, which rises from ~;;5 m at 1016 eV to ~;;40 m at 1019 eV and ~;;100 m at 1020 eV, but only to ~;;300 m at 1024 eV. In contrast, without photonuclear and electronuclear interactions, the shower length would be over 10 km at 1024 eV.
Date:
June 10, 2010
Creator:
Gerhardt, L. & Klein, S.
Object Type:
Article
System:
The UNT Digital Library
Controlled Hydrogen Fleet and Infrastructure Analysis
This presentation summarizes controlled hydrogen fleet & infrastructure analysis undertaken for the DOE Fuel Cell Technologies Program.
Date:
June 10, 2010
Creator:
Wipke, K.; Sprik, S.; Kurtz, J. & Ramsden, T.
Object Type:
Presentation
System:
The UNT Digital Library
A Prognostic Method for Scheduling Maintenance on the P2- Marx Modulator
The SLAC National Accelerator Laboratory is developing a second generation Marx-type modulator for the ILC, the P2-Marx. The modulator is expected to operate reliably in excess of 10{sup 5} hours with minimum downtime. A prognostic system is being implemented with the development of the P2-Marx to monitor and track the health of key high voltage components. This paper discusses the way in which the prognostic system will be implemented and used to monitor the health of the P2-Marx modulator.
Date:
June 10, 2010
Creator:
Benwell, Andrew; Burkhart, Craig; Kemp, Mark; Macken, Koen; Nguyen, Minh; MacNair, Dave et al.
Object Type:
Article
System:
The UNT Digital Library
Ab initio Based Modeling of Radiation Effects in Multi-Component Alloys: Final Scientific/Technical Report
The project began March 13, 2006, allocated for three years, and received a one year extension from March 13, 2009 to March 12, 2010. It has now completed 48 of 48 total months. The project was focused on using ab initio methods to gain insights into radiation induced segregation (RIS) in Ni-Fe-Cr alloys. The project had the following key accomplishments • Development of a large database of ab initio energetics that can be used by many researchers in the future for increased understanding of this system. For example, we have the first calculations showing a dramatic stabilization effect of Cr-Cr interstitial dumbbells in Ni. • Prediction of both vacancy and interstitial diffusion constants for Ni-Cr and Ni-Fe for dilute Cr and Fe. This work included generalization of widely used multifrequency models to make use of ab initio derived energetics and thermodynamics. • Prediction of qualitative trends of RIS from vacancy and interstitial mechanisms, suggesting the two types of defect fluxes drive Cr RIS in opposite directions. • Detailed kinetic Monte Carlo modeling of diffusion by vacancy mechanism in Ni-Cr as a function of Cr concentration. The results demonstrate that Cr content can have a significant effect on RIS. • Development …
Date:
June 10, 2010
Creator:
Morgan, Dane
Object Type:
Report
System:
The UNT Digital Library
Heterotrophic Soil Respiration in Warming Experiments: Using Microbial Indicators to Partition Contributions from Labile and Recalcitrant Soil Organic Carbon. Final Report
The central objective of the proposed work was to develop a genomic approach (nucleic acid-based) that elucidates the mechanistic basis for the observed impacts of experimental soil warming on forest soil respiration. The need to understand the mechanistic basis arises from the importance of such information for developing effective adaptation strategies for dealing with projected climate change. Specifically, robust predictions of future climate will permit the tailoring of the most effective adaptation efforts. And one of the greatest uncertainties in current global climate models is whether there will be a net loss of carbon from soils to the atmosphere as climate warms. Given that soils contain approximately 2.5 times as much carbon as the atmosphere, a net loss could lead to runaway climate warming. Indeed, most ecosystem models predict that climate warming will stimulate microbial decomposition of soil carbon, producing such a positive feedback to rising global temperatures. Yet the IPCC highlights the uncertainty regarding this projected feedback. The uncertainty arises because although warming-experiments document an initial increase in the loss of carbon from soils, the increase in respiration is short-lived, declining to control levels in a few years. This attenuation could result from changes in microbial physiology with temperature. …
Date:
June 10, 2010
Creator:
Bradford, M. A.; Melillo, J. M.; Reynolds, J. F.; Treseder, K. K. & Wallenstein, M. D.
Object Type:
Report
System:
The UNT Digital Library
Results from the Cooler and Lead Tests
The report presents the results of testing MICE spectrometer magnet current leads on a test apparatus that combines both the copper leads and the high temperature superconducting (HTS) leads with a single Cryomech PT415 cooler and liquid helium tank. The current is carried through the copper leads from 300 K to the top of the HTS leads. The current is then carried through the HTS leads to a feed-through from the vacuum space to the inside of a liquid helium tank. The experiment allows one to measure the performance of both cooler stages along with the performance of the leads. While the leads were powered we measured the voltage drops through the copper leads, through the HTS leads, through spliced to the feed-through, through the feed-through and through the low-temperature superconducting loop that connects one lead to the other. Measurements were made using the leads that were used in spectrometer magnet 1A and spectrometer magnet 2A. These are the same leads that were used for Superbend and Venus magnets at LBNL. The IL/A for these leads was 5.2 x 10{sup 6} m{sup -1}. The leads turned out to be too long. The same measurements were made using the leads that …
Date:
June 10, 2010
Creator:
Green, Michael A.
Object Type:
Report
System:
The UNT Digital Library
Consolidation of K Basin Sludge Data and Experiences on Agglomerate Formation
The formation of high sludge strength agglomerates is a key concern to the Sludge Treatment Project (STP) to ensure the sludge can be retrieved after planned storage for up to 10 years in Sludge Transport and Storage Containers (STSC) at T Plant. This report addresses observations of agglomerate formation, conditions that the data shows lead to agglomeration, the frequency of agglomerate formation and postulated physiochemical mechanisms that may lead to agglomeration. Although the exact underlying chemistry of K Basin sludge agglomerate formation is not known, the factors that lead to agglomeration formation, based on observations, are as follows: (1) High Total Uranium Content (i.e., sample homogeneity and influence from other constituents); (2) Distribution of Uranium Phases (i.e., extent of conversion from uraninite to uranium oxide hydroxide compounds); (3) Sample Dry-out (loss of cover water); (4) Elevated temperature; (5) Solubility ofU(IV) phases vs. U(VI) phases; and (6) Long storage times. Agglomerated sludge has occurred infrequently and has only been observed in four laboratory samples, five samples subjected to hydrothermal testing (performed for 7 to 10 hours at {approx}185 C and 225 psig), and indirectly during six sampling events in the KE Basin. In the four laboratory samples where agglomerates were observed, …
Date:
June 10, 2010
Creator:
Hill, S.R.
Object Type:
Report
System:
The UNT Digital Library
Determination of ionization energies of CnN (n=4-12): Vacuum-ultraviolet (VUV) photoionization experiments and theoretical calculations
Results from single photon vacuum ultraviolet photoionization of astrophysically relevant CnN clusters, n = 4 - 12, in the photon energy range of 8.0 eV to 12.8 eV are presented. The experimental photoionization efficiency curves, combined with electronic structure calculations, provide improved ionization energies of the CnN species. A search through numerous nitrogen-terminated CnN isomers for n=4-9 indicates that the linear isomer has the lowest energy, and therefore should be the most abundant isomer in the molecular beam. Comparison with calculated results also shed light on the energetics of the linear CnN clusters, particularly in the trends of the even-carbon and the odd-carbon series. These results can help guide the search of potential astronomical observations of these neutral molecules together with their cations in highly ionized regions or regions with a high UV/VUV photon flux (ranging from the visible to VUV with flux maxima in the Lyman- region) in the interstellar medium.
Date:
June 10, 2010
Creator:
Kostko, Oleg; Zhou, Jia; Sun, Bian Jian; Lie, Jie Shiuan; Chang, Agnes H.H.; Kaiser, Ralf I. et al.
Object Type:
Article
System:
The UNT Digital Library
Texas Attorney General Opinion: GA-1008
Document issued by the Office of the Attorney General of Texas in Austin, Texas, providing an interpretation of Texas law. It provides the opinion of the Texas Attorney General, Greg Abbott, regarding a legal question submitted for clarification: Whether the Texas Medical Board may allow its investigators who hold a concealed handgun license to carry a concealed handgun while on duty without subjecting the Board to liability (RQ-11 04-GA).
Date:
June 10, 2013
Creator:
Texas. Attorney-General's Office.
Object Type:
Text
System:
The Portal to Texas History
84th Texas Legislature, Regular Session, House Bill 2507, Chapter 410
Bill introduced by the Texas House of Representatives relating to a sales and use tax exemption for certain equipment used for digital audio broadcasting.
Date:
June 10, 2015
Creator:
Texas. Legislature. House of Representatives.
Object Type:
Legislative Document
System:
The Portal to Texas History
84th Texas Legislature, Regular Session, House Bill 2712, Chapter 412
Bill introduced by the Texas House of Representatives relating to the temporary exemption of certain tangible personal property related to large data center projects from the sales and use tax.
Date:
June 10, 2015
Creator:
Texas. Legislature. House of Representatives.
Object Type:
Legislative Document
System:
The Portal to Texas History
84th Texas Legislature, Regular Session, House Bill 122, Chapter 387
Bill introduced by the Texas House of Representatives relating to the Texas Mobility Fund.
Date:
June 10, 2015
Creator:
Texas. Legislature. House of Representatives.
Object Type:
Legislative Document
System:
The Portal to Texas History
84th Texas Legislature, Regular Session, House Bill 3067, Chapter 417
Bill introduced by the Texas House of Representatives relating to the amount that may be donated by contract by certain populous counties to crime stoppers or crime prevention organizations.
Date:
June 10, 2015
Creator:
Texas. Legislature. House of Representatives.
Object Type:
Legislative Document
System:
The Portal to Texas History
84th Texas Legislature, Regular Session, House Concurrent Resolution 65
Concurrent resolution introduced by the Texas House of Representatives and Senate designating the western honey bee as the official State Pollinator of Texas.
Date:
June 10, 2015
Creator:
Texas. Legislature. House of Representatives.
Object Type:
Legislative Document
System:
The Portal to Texas History
84th Texas Legislature, Regular Session, House Bill 797, Chapter 377
Bill introduced by the Texas House of Representatives relating to the Hunt Memorial Hospital District; authorizing the issuance of bonds.
Date:
June 10, 2015
Creator:
Texas. Legislature. House of Representatives.
Object Type:
Legislative Document
System:
The Portal to Texas History
84th Texas Legislature, Regular Session, House Bill 1146, Chapter 392
Bill introduced by the Texas House of Representatives relating to persons who may operate a public water supply system.
Date:
June 10, 2015
Creator:
Texas. Legislature. House of Representatives.
Object Type:
Legislative Document
System:
The Portal to Texas History
84th Texas Legislature, Regular Session, House Bill 745, Chapter 376
Bill introduced by the Texas House of Representatives relating to the installation of solar-powered stop signs by a property owners' association.
Date:
June 10, 2015
Creator:
Texas. Legislature. House of Representatives.
Object Type:
Legislative Document
System:
The Portal to Texas History
84th Texas Legislature, Regular Session, House Bill 1466, Chapter 396
Bill introduced by the Texas House of Representatives relating to Parks and Wildlife Department procedures for the transfer of ownership of boats or outboard motors; providing penalties; creating a criminal offense.
Date:
June 10, 2015
Creator:
Texas. Legislature. House of Representatives.
Object Type:
Legislative Document
System:
The Portal to Texas History
84th Texas Legislature, Regular Session, House Concurrent Resolution 110
Concurrent resolution introduced by the Texas House of Representatives and Senate recognizing May 2015 as Amyotrophic Lateral Sclerosis Month.
Date:
June 10, 2015
Creator:
Texas. Legislature. House of Representatives.
Object Type:
Legislative Document
System:
The Portal to Texas History
Cooper Review (Cooper, Tex.), Vol. 131, No. 23, Ed. 1 Wednesday, June 10, 2010
Weekly newspaper from Cooper, Texas that includes local, state, and national news along with advertising.
Date:
June 10, 2010
Creator:
Palmer, Roger
Object Type:
Newspaper
System:
The Portal to Texas History
Rains County Leader (Emory, Tex.), Vol. 127, No. 52, Ed. 1 Tuesday, June 10, 2014
Weekly newspaper from Emory, Texas that includes local, state, and national news along with advertising.
Date:
June 10, 2014
Creator:
Hill, Trey
Object Type:
Newspaper
System:
The Portal to Texas History
Oral History Interview with Dalila Dolenz, June 10 2015
Interview with Dalila Dolenz, a nurse and civil rights activist from Fort Worth, Texas. In the interview, she discusses her work, activism and interaction with Cesar Chavez
Date:
June 10, 2015
Creator:
Dolenz, Dalila; Enriquez, Sandra & Robles, David
Object Type:
Video
System:
The Portal to Texas History
Oral History Interview with Robert Medrano, June 10, 2015
Interview with Robert Medrano, businessman and elected official from Dallas, Texas. Medrano is the son of Francisco "Pancho" Medrano and brother of Ricardo Medrano, also local politicians. In his interview, Medrano discusses his his upbringing in the "Little Mexico" section of Dallas, his family's political activities, and Chicano activism in the 1960s and 1970s.
Date:
June 10, 2015
Creator:
Medrano, Robert & Acuña-Gurrola, Moisés
Object Type:
Video
System:
The Portal to Texas History
A Model for Integrating the Publication and Preservation of Journal Articles [Revision]
Revised version of a presentation for Open Repositories 2014 discussing a model for integrating the publication and preservation of journal articles.
Date:
June 10, 2014
Creator:
Hawkins, Kevin S.
Object Type:
Presentation
System:
The UNT Digital Library