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Extracting Short Rise-Time Velocity Profiles with Digital Down-Shift Analysis of Optically Up-Converted PDV Data
This work describes the digital down-shift (DDS) technique, a new method of extracting short rise-time velocity profiles in the analysis of optically up-converted PDV data. The DDS technique manipulates the PDV data by subtracting a constant velocity (i.e., the DDS velocity νDDS) from the velocity profile. DDS exploits the simple fact that the optically up-converted data ride on top of a base velocity (ν0, the apparent velocity at no motion) with a rapid rise to a high velocity (νf) of a few km/s or more. Consequently, the frequency content of the signal must describe a velocity profile that increases from ν0 to ν0 + νf. The DDS technique produces velocity reversals in the processed data before shock breakout when ν0 < νDDS < ν0 + νf. The DDS analysis process strategically selects specific DDS velocities (velocity at which the user down shifts the data) that produce anomalous reversals (maxima and/or minima), which are predictable and easy to identify in the mid-range of the data. Additional analysis determines when these maxima and minima occur. By successive application of the DDS technique and iterative analysis, velocity profiles are extracted as time as a function of velocity rather than as a function of …
Date:
September 8, 2010
Creator:
Abel Diaz, Nathan Riley, Cenobio Gallegos, Matthew Teel, Michael Berninger, Thomas W. Tunnell
Object Type:
Article
System:
The UNT Digital Library
Hezbollah: Background and Issues for Congress
This report discusses Lebanon's Hezbollah, a Shiite Islamist militia, political party, social welfare organization, and U.S. State Department-designated terrorist organization. The report discusses recent Hezbollah-related conflicts, Hezbollah's relationship with other Lebanese political parties, and U.S. policy regarding Hezbollah.
Date:
October 8, 2010
Creator:
Addis, Casey L. & Blanchard, Christopher M.
Object Type:
Report
System:
The UNT Digital Library
Trade Primer: Qs and As on Trade Concepts, Performance, and Policy
This report is divided into four sections in a question-and-answer format: trade concepts, U.S. trade performance, formulation of U.S. trade policy, and trade and investment issues. The first section on "Trade Concepts" deals with why countries trade, the consequences of trade expansion, and the relationship between globalization and trade. The second section, on trade performance, focuses on the U.S. trade deficit and its impact on industries. The third section deals with the roles played by the Executive Branch, Congress, the private sector, and the Judiciary in the formulation of U.S. trade policy. The fourth section, on U.S. trade and investment policy, asks questions related to trade negotiations and agreements and to imports, exports, and investments.
Date:
December 8, 2010
Creator:
Ahearn, Raymond J.
Object Type:
Report
System:
The UNT Digital Library
MHD Simulations of Core Collapse Supernovae with Cosmos++
None
Date:
July 8, 2010
Creator:
Akiyama, S & Salmonson, J
Object Type:
Article
System:
The UNT Digital Library
The 2010 Oil Spill: Natural Resource Damage Assessment Under the Oil Pollution Act
The 2010 Deepwater Horizon oil spill leaked an estimated 4.1 million barrels of oil into the Gulf of Mexico, damaging the waters, shores, and marshes, and the fish and wildlife that live there. When resources in the public trust are harmed by contamination, federal, state, foreign, and tribal governments may seek compensation for damage to natural resources under certain laws. This is done in two steps: first, by assessing the harm; then, by determining how and what restoration will take place. Compensation for natural resource damage is intended to restore the natural resources to their condition before the damage and to compensate the public for the lost use of those resources. This report discusses legislation that provides a framework for assessing and mitigating the damage caused by such spills.
Date:
September 8, 2010
Creator:
Alexander, Kristina
Object Type:
Report
System:
The UNT Digital Library
Abiotic Degradation Rates for Carbon Tetrachloride and Chloroform: Progress in FY 2010
This report documents the progress made through FY 2010 on a project initiated in FY 2006 to help address uncertainties related to the rates of hydrolysis in groundwater at the Hanford Site for carbon tetrachloride (CT) and chloroform (CF). The study also explores the possible effects of contact with minerals and sediment (i.e., heterogeneous hydrolysis) on these rates. The research was initiated to decrease the uncertainties in abiotic degradation rates of CT and chloroform CF associated with temperature and possible heterogeneous effects. After 2 years of data collection, the first evidence for heterogeneous effects was identified for hydrolysis of CT, and preliminary evidence for the effects of different mineral types on CF hydrolysis rates also was reported. The CT data showed no difference among mineral types, whereas significant differences were seen in the CF results, perhaps due to the fact that CF hydrolyzes by both neutral and base-catalyzed mechanisms whereas CT follows only the neutral hydrolysis path. In this report, we review the project objectives, organization, and technical approaches taken, update the status and results of the hydrolysis-rate experiments after 4 years of experimentation (i.e., through FY 2010), and provide a brief discussion of how these results add to scientific …
Date:
December 8, 2010
Creator:
Amonette, James E.; Jeffers, Peter M.; Qafoku, Odeta; Russell, Colleen K.; Humphrys, Daniel R.; Wietsma, Thomas W. et al.
Object Type:
Report
System:
The UNT Digital Library
Electronic and magnetic structure of GaxFe1-x thin films
The electronic as well as magnetic properties of Ga{sub x}Fe{sub 1-x} films were studied by soft x-ray measurements. Using x-ray magnetic circular dichroism the Fe majority-spin band was found to be completely filled for x {approx} 0.3. With further enhanced Ga content, the Fe moment as well as the angular dependence of the x-ray magnetic linear dichroism decrease strongly, which we attribute to the formation of D0{sub 3} precipitates. Moreover, the magnetocrystalline anisotropy drops significantly.
Date:
September 8, 2010
Creator:
Arenholz, E.; van der Laan, G.; McClure, A. & Idzerda, Y.
Object Type:
Article
System:
The UNT Digital Library
Ultrafast observation of shocked states in a precompressed material
None
Date:
July 8, 2010
Creator:
Armstrong, M R; Crowhurst, J C; Bastea, S & Zaug, J M
Object Type:
Article
System:
The UNT Digital Library
The Debt Limit: History and Recent Increases
This report discusses how the total debt of the federal government can increase, an historical overview of debt limits, and how the current economic slowdown has led to higher deficits and thereby a series of debt limit increases, as well as legislation related to these increases.
Date:
September 8, 2010
Creator:
Austin, D. Andrew & Levit, Mindy R.
Object Type:
Report
System:
The UNT Digital Library
Impeachment: An Overview of Constitutional Provisions, Procedure, and Practice
On June 19, 2009, the House voted to impeach U.S. District Judge Samuel B. Kent of the U.S. District Court for the Southern District of Texas. The impeachment process provides a mechanism for removal of the President, Vice President, and other federal civil officers found to have engaged in "treason, bribery, or other high crimes and misdemeanors." This report explains the impeachment process, including its history and the process itself.
Date:
April 8, 2010
Creator:
Bazan, Elizabeth B. & Henning, Anna C.
Object Type:
Report
System:
The UNT Digital Library
Environmental Laws: Summaries of Major Statutes Administered by the Environmental Protection Agency
This report summarizes several federal statutes providing legal authority for the Environmental Protection Agency's (EPA) programs and activities. These include: the Clean Air Act (CAA), the Clean Water Act (CWA), the Ocean Dumping Act, the Safe Drinking Water Act (SDWA), the Solid Waste Disposal Act, the Resource Conservation and Recovery Act (RCRA), the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA), the Toxic Substances Control Act (TSCA), the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA), the Pollution Prevention Act (PPA), the Emergency Planning Act, and the Community Right-to-Know Act (EPCRA).
Date:
October 8, 2010
Creator:
Bearden, David M.; Copeland, Claudia; Luther, Linda; McCarthy, James E.; Schierow, Linda-Jo & Tiemann, Mary
Object Type:
Report
System:
The UNT Digital Library
South Texas Catholic (Corpus Christi, Tex.), Vol. 45, No. 1, Ed. 1 Friday, January 8, 2010
Semi-monthly newspaper from Corpus Christi, Texas published by the Diocese of Corpus Christi that includes news of interest to Diocese members along with advertising.
Date:
January 8, 2010
Creator:
Beaton, Paula J.
Object Type:
Newspaper
System:
The Portal to Texas History
FY2010 Supplemental for Wars, Disaster Assistance, Haiti Relief, and Other Programs
This report discusses the $64 billion in requested supplemental appropriations for FY2010, which includes $2.8 billion for Haiti earthquake-related reconstruction and foreign aid and $243 million for activities related to the Deepwater Horizon oil spill and more.
Date:
June 8, 2010
Creator:
Belasco, Amy; Else, Daniel H.; Lindsay, Bruce R.; Margesson, Rhoda; Nakamura, Kennon H. & Taft-Morales, Maureen
Object Type:
Report
System:
The UNT Digital Library
NSLS-II: Nonlinear Model Calibration for Synchrotrons
This tech note is essentially a summary of a lecture we delivered to the Acc. Phys. Journal Club Apr, 2010. However, since the estimated accuracy of these methods has been naive and misleading in the field of particle accelerators, i.e., ignores the impact of noise, we will elaborate on this in some detail. A prerequisite for a calibration of the nonlinear Hamiltonian is that the quadratic part has been understood, i.e., that the linear optics for the real accelerator has been calibrated. For synchrotron light source operations, this problem has been solved by the interactive LOCO technique/tool (Linear Optics from Closed Orbits). Before that, in the context of hadron accelerators, it has been done by signal processing of turn-by-turn BPM data. We have outlined how to make a basic calibration of the nonlinear model for synchrotrons. In particular, we have shown how this was done for LEAR, CERN (antiprotons) in the mid-80s. Specifically, our accuracy for frequency estimation was {approx} 1 x 10{sup -5} for 1024 turns (to calibrate the linear optics) and {approx} 1 x 10{sup -4} for 256 turns for tune footprint and betatron spectrum. For a comparison, the estimated tune footprint for stable beam for NSLS-II is …
Date:
October 8, 2010
Creator:
Bengtsson, J.
Object Type:
Report
System:
The UNT Digital Library
Using wesBench to Study the Rendering Performance of Graphics Processing Units
Graphics operations consist of two broad operations. The first, which we refer to here as vertex operations, consists of transformation, lighting, primitive assembly, and so forth. The second, which we refer to as pixel or fragment operations, consist of rasterization, texturing, scissoring, blending, and fill. Overall GPU rendering performance is a function of throughput of both these interdependent stages: if one stage is slower than the other, the faster stage will be forced to run more slowly and overall rendering performance will be adversely affected. This relationship is commutative: if the later stage has a greater workload than the earlier stage, the earlier stage will be forced to 'slow down.' For example, a large triangle that covers many screen pixels will incur a very small amount of work in the vertex stage while at the same time incurring a relatively large amount of work in the fragment stage. Rendering performance of a scene consisting of many large-area triangles will be limited by throughput of the fragment stage, which will have relatively more work than the vertex stage. There are two main objectives for this document. First, we introduce a new graphics benchmark, wesBench, which is useful for measuring performance of …
Date:
January 8, 2010
Creator:
Bethel, Edward W
Object Type:
Report
System:
The UNT Digital Library
Certain Temporary Tax Provisions Scheduled to Expire in 2009 (“Extenders”)
This report discusses numerous temporary tax provisions exist in the tax code. Often referred to as “extenders,” these provisions were originally enacted with an expiration date that has then been temporarily extended, in some cases numerous times.
Date:
September 8, 2010
Creator:
Bickley, James M.
Object Type:
Report
System:
The UNT Digital Library
Controlled incorporation of mid-to-high Z transition metals in CVD diamond
We report on a general method to fabricate transition metal related defects in diamond. Controlled incorporation of Mo and W in synthetic CVD diamond was achieved by adding volatile metal precursors to the diamond chemical vapor deposition (CVD) growth process. Effects of deposition temperature, grain structure and precursor exposure on the doping level were systematically studied, and doping levels of up to 0.25 at.% have been achieved. The metal atoms are uniformly distributed throughout the diamond grains without any indication of inclusion formation. These results are discussed in context of the kinetically controlled growth process of CVD diamond.
Date:
January 8, 2010
Creator:
Biener, M M; Biener, J; Kucheyev, S O; Wang, Y M; El-Dasher, B; Teslich, N E et al.
Object Type:
Article
System:
The UNT Digital Library
Time-Temperature-Transformation (TTT) Diagrams for Future Waste Compositions
As a part of the Waste Acceptance Product Specifications (WAPS) for Vitrified High-Level Waste Forms defined by the Department of Energy - Office of Environmental Management, the waste form stability must be determined for each of the projected high-level waste (HLW) types at the Savannah River Site (SRS). Specifically, WAPS 1.4.1 requires the glass transition temperature (T{sub g}) to be defined and time-temperature-transformation (TTT) diagrams to be developed. The T{sub g} of a glass is an indicator of the approximate temperature where the supercooled liquid converts to a solid on cooling or conversely, where the solid begins to behave as a viscoelastic solid on heating. A TTT diagram identifies the crystalline phases that can form as a function of time and temperature for a given waste type or more specifically, the borosilicate glass waste form. In order to assess durability, the Product Consistency Test (PCT) was used and the durability results compared to the Environmental Assessment (EA) glass. The measurement of glass transition temperature and the development of TTT diagrams have already been performed for the seven Defense Waste Processing Facility (DWPF) projected compositions as defined in the Waste Form Compliance Plan (WCP) and in SRNL-STI-2009-00025. Additional phase transformation information …
Date:
July 8, 2010
Creator:
Billings, A. & Edwards, T.
Object Type:
Report
System:
The UNT Digital Library
Hanford Site Environmental Surveillance Master Sampling Schedule for Calendar Year 2010
Environmental surveillance of the Hanford Site and surrounding areas is conducted by Pacific Northwest National Laboratory for the U.S. Department of Energy (DOE). Sampling is conducted to evaluate levels of radioactive and nonradioactive pollutants in the Hanford Site environs per regulatory requirements. This document contains the calendar year 2010 schedule for the routine collection of samples for the Surface Environmental Surveillance Project and the Drinking Water Monitoring Project. Each section includes sampling locations, sampling frequencies, sample types, and analyses to be performed. In some cases, samples are scheduled on a rotating basis. If a sample will not be collected in 2010, the anticipated year for collection is provided. Maps showing approximate sampling locations are included for media scheduled for collection in 2010.
Date:
January 8, 2010
Creator:
Bisping, Lynn E.
Object Type:
Report
System:
The UNT Digital Library
International Population Assistance and Family Planning Programs: Issues for Congress
This report provides the issues for congress on the international population assistance and family planning programs.
Date:
July 8, 2010
Creator:
Blanchfield, Luisa
Object Type:
Report
System:
The UNT Digital Library
Science & Technology Review April/May 2010
This month's issue has the following articles: (1) Fifty Years of Stellar Laser Research - Commentary by Edward I. Moses; (2) A Stellar Performance - By combining computational models with test shot data, scientists at the National Ignition Facility have demonstrated that the laser is spot-on for ignition; (3) Extracting More Power from the Wind - Researchers are investigating how atmospheric turbulence affects power production from wind turbines; (4) Date for a Heart Cell - Carbon-14 dating reveals that a significant number of heart muscle cells are regenerated over the course of our lives; and (5) Unique Marriage of Biology and Semiconductors - A new device featuring a layer of fat surrounding a thin silicon wire takes advantage of the communication properties of both biomolecules and semiconductors.
Date:
March 8, 2010
Creator:
Blobaum, K M
Object Type:
Report
System:
The UNT Digital Library
War in Afghanistan: Strategy, Military Operations, and Issues for Congress
This report discusses the ongoing U.S. military operations in Afghanistan, begun in the aftermath of the terrorist attacks of September 11, 2001. The report, which will be updated as events warrant, describe and analyzes several issues, including the key players in the war in Afghanistan; the strategic outlooks of the Afghan government, the U.S. government, and NATO; and the threats to the security and stability of the Afghan state and its people.
Date:
June 8, 2010
Creator:
Bowman, Steve & Dale, Catherine
Object Type:
Report
System:
The UNT Digital Library
ELIST 8.7 Transportation Model
None
Date:
January 8, 2010
Creator:
Braun, M. D.; Craig, B. A.; Van Groningen, C. N. & Sciences, Decision and Information
Object Type:
Report
System:
The UNT Digital Library
Use of Atomic Layer Deposition of Functionalization of Nanoporous Biomaterials
Due to its chemical stability, uniform pore size, and high pore density, nanoporous alumina is being investigated for use in biosensing, drug delivery, hemodialysis, and other medical applications. In recent work, we have examined the use of atomic layer deposition for coating the surfaces of nanoporous alumina membranes. Zinc oxide coatings were deposited on nanoporous alumina membranes using atomic layer deposition. The zinc oxide-coated nanoporous alumina membranes demonstrated antimicrobial activity against Escherichia coli and Staphylococcus aureus bacteria. These results suggest that atomic layer deposition is an attractive technique for modifying the surfaces of nanoporous alumina membranes and other nanostructured biomaterials.
Date:
February 8, 2010
Creator:
Brigmon, R.; Narayan, R.; Adiga, S.; Pellin, M.; Curtiss, L.; Stafslien, S. et al.
Object Type:
Article
System:
The UNT Digital Library