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Office of Scientific & Technical Information Technical Reports
1,336
Congressional Research Service Reports
770
Defense Base Closure and Realignment Commission
472
Government Accountability Office Reports
185
Texas Attorney General Opinions
51
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49
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NATO in Afghanistan: A Test of the Transatlantic Alliance
This report discusses the mission of the North Atlantic Treaty Organization (NATO) in Afghanistan, the purpose of which is to stabilize and reconstruct Afghanistan by combating emerging threats such as terrorism and the proliferation of weapons of mass destruction. This report also discusses how the Obama Administration has made the Afghanistan conflict a policy priority, and what this stance could mean for potential future endeavors.
Date:
July 2, 2009
Creator:
Morelli, Vincent & Belkin, Paul
Object Type:
Report
System:
The UNT Digital Library
Ocean Acidification
With increasing concentrations of carbon dioxide (CO2) in the atmosphere, the extent of effects on the ocean and marine resources is an increasing concern. One aspect of this issue is the ongoing process whereby seawater becomes acidified (i.e., ocean acidification) as more CO2 dissolves in it, causing hydrogen ion concentration in seawater to increase. While not yet fully understood, the ecological and economic consequences of ocean acidification could be substantial. Congress is beginning to focus attention on better understanding ocean acidification and determining how this concern might be addressed.
Date:
July 2, 2009
Creator:
Buck, Eugene H. & Folger, Peter
Object Type:
Report
System:
The UNT Digital Library
Ocean Acidification
With increasing concentrations of carbon dioxide (CO2) in the atmosphere, the extent of effects on the ocean and marine resources is an increasing concern. One aspect of this issue is the ongoing process whereby seawater becomes acidified (i.e., ocean acidification) as more CO2 dissolves in it, causing hydrogen ion concentration in seawater to increase.
Date:
July 2, 2009
Creator:
Buck, Eugene H. & Folger, Peter
Object Type:
Report
System:
The UNT Digital Library
Ocean Acidification
With increasing concentrations of carbon dioxide (CO2) in the atmosphere, the extent of effects on the ocean and marine resources is an increasing concern. One aspect of this issue is the ongoing process whereby seawater becomes acidified (i.e., ocean acidification) as more CO2 dissolves in it, causing hydrogen ion concentration in seawater to increase.
Date:
July 2, 2009
Creator:
Buck, Eugene H. & Folger, Peter
Object Type:
Report
System:
The UNT Digital Library
SCIENCE AND TECHNOLOGY ACTIVITIES FOR CHROMIUM IN THE 100 AREAS
{sm_bullet} Primary Objective: Protect the Columbia River - Focus is control and treatment of contamination at or near the shoreline, which is influenced by bank storage {sm_bullet} Secondary Objective: Reduce hexavalent chromium to <48 parts per billion (ppb) in aquifer (drinking water standard) - Large plumes with isolated areas of high chromium concentrations (> 40,000 ppb), - Unknown source location(s); probably originating in reactor operation areas
Date:
July 2, 2009
Creator:
SW, PETERSEN
Object Type:
Article
System:
The UNT Digital Library
Scientific Grand Challenges: Challenges in Climate Change Science and the Role of Computing at the Extreme Scale
The U.S. Department of Energy (DOE) Office of Biological and Environmental Research (BER) in partnership with the Office of Advanced Scientific Computing Research (ASCR) held a workshop on the challenges in climate change science and the role of computing at the extreme scale, November 6-7, 2008, in Bethesda, Maryland. At the workshop, participants identified the scientific challenges facing the field of climate science and outlined the research directions of highest priority that should be pursued to meet these challenges. Representatives from the national and international climate change research community as well as representatives from the high-performance computing community attended the workshop. This group represented a broad mix of expertise. Of the 99 participants, 6 were from international institutions. Before the workshop, each of the four panels prepared a white paper, which provided the starting place for the workshop discussions. These four panels of workshop attendees devoted to their efforts the following themes: Model Development and Integrated Assessment; Algorithms and Computational Environment; Decadal Predictability and Prediction; Data, Visualization, and Computing Productivity. The recommendations of the panels are summarized in the body of this report.
Date:
July 2, 2009
Creator:
Khaleel, Mohammad A.; Johnson, Gary M. & Washington, Warren M.
Object Type:
Report
System:
The UNT Digital Library
Solving a Class of Nonlinear Eigenvalue Problems by Newton's Method
We examine the possibility of using the standard Newton's method for solving a class of nonlinear eigenvalue problems arising from electronic structure calculation. We show that the Jacobian matrix associated with this nonlinear system has a special structure that can be exploited to reduce the computational complexity of the Newton's method. Preliminary numerical experiments indicate that the Newton's method can be more efficient for small problems in which a few smallest eigenpairs are needed.
Date:
July 2, 2009
Creator:
Gao, Weiguo; Yang, Chao & Meza, Juan C.
Object Type:
Report
System:
The UNT Digital Library
Trafficking in Persons: U.S. Policy and Issues for Congress
Trafficking in persons (TIP) for the purposes of exploitation is believed to be one of the most prolific areas of international criminal activity and is of significant concern to the United States and the international community. This report discusses the global and ongoing problem of TIP in detail, as well as anti-TIP programs and U.S. and international efforts to combat TIP.
Date:
July 2, 2009
Creator:
Wyler, Liana Sun; Siskin, Alison & Seelke, Clare Ribando
Object Type:
Report
System:
The UNT Digital Library
Trafficking in Persons: U.S. Policy and Issues for Congress
Trafficking in persons (TIP) for the purposes of exploitation is both an international and a domestic crime that involves violations of labor, public health, and human rights standards. This report focuses on human trafficking both internationally and within the United States. The report begins with an overview of human trafficking including a discussion of the definition of human trafficking, the scope of the problem globally, and an examination of the victims. It follows with an analysis of global anti-trafficking efforts by the United States and the international community. The report then focuses on trafficking into and within the United States, examining relief for trafficking victims in the United States and discussing U.S. law enforcement efforts to combat domestic trafficking. The report concludes with an overview of anti-trafficking legislation and an analysis of policy issues related to human trafficking.
Date:
July 2, 2009
Creator:
Wyler, Liana Sun
Object Type:
Report
System:
The UNT Digital Library
Troop Levels in the Afghan and Iraq Wars, FY2001-FY2012: Cost and Other Potential Issues
In February and March 2009, the Obama Administration announced its overall plans to increase troop levels in Afghanistan and decrease troop levels in Iraq for 2009 through 2011. Using several Department of Defense (DOD) data reports, this report describes, analyzes, and estimates deployed troop strength from the 9/11 attacks to FY2012 to provide Congress with a tool to assess current and future DOD war funding requests; implications for the U.S. military presence in the region; and deployment burdens on individual service members and each of the services.
Date:
July 2, 2009
Creator:
Belasco, Amy
Object Type:
Report
System:
The UNT Digital Library
Urban Area Security Initiative: FEMA Lacks Measures to Assess How Regional Collaboration Efforts Build Preparedness Capabilities
A letter report issued by the Government Accountability Office with an abstract that begins "From fiscal year 2003 through fiscal year 2009, the Department of Homeland Security (DHS) allocated about $5 billion for the Urban Area Security Initiative (UASI) grant program to enhance regional preparedness capabilities in the nation's highest risk urban areas (UASI regions). The Federal Emergency Management Agency (FEMA) administers this program. The Implementing Recommendations of the 9/11 Commission Act of 2007 (9/11 Act) required FEMA to change the size of the geographical areas used to assess UASI regions' risk. The conference report accompanying the Consolidated Appropriations Act for fiscal year 2008 directed GAO to assess FEMA's efforts to build regional preparedness through the UASI program, and determine how the 9/11 Act change affected UASI regions. This report addresses (1) the extent to which FEMA assesses how UASI regions' collaborative efforts build preparedness capabilities, and (2) how UASI officials described their collaboration efforts and changes resulting from the 9/11 Act. GAO surveyed all 49 UASI regions that received funding prior to the 9/11 Act change, and visited 6 regions selected based on factors such as length of participation. GAO also reviewed FEMA's grant guidance and monitoring systems."
Date:
July 2, 2009
Creator:
United States. Government Accountability Office.
Object Type:
Report
System:
The UNT Digital Library
3 GeV Booster Synchrotron Conceptual Design Report
Synchrotron light cna be produced from a relativistic particle beam circulating in a storage ring at extremely high intensity and brilliance over a large spectral region reaching from the far infrared regime to hard x-rays. The particles, either electrons or positrons, radiate as they are deflected in the fields of the storage ring bending magnets or of magnets specially optimized for the production of synchrotron light. The synchrotron light being very intense and well collimated in the forward direction has become a major tool in a large variety of research fields in physics, chemistry, material science, biology, and medicine.
Date:
June 2, 2009
Creator:
Wiedemann, Helmut
Object Type:
Report
System:
The UNT Digital Library
Analytic one-loop amplitudes for a Higgs boson plus four partons
We compute the one-loop QCD amplitudes for the processes H{anti q}q{anti Q}Q and H{anti q}qgg, the latter restricted to the case of opposite-helicity gluons. Analytic expressions are presented for the color- and helicity-decomposed amplitudes. The coupling of the Higgs boson to gluons is treated by an effective interaction in the limit of large top quark mass. The Higgs field is split into a complex field {phi} and its complex conjugate {phi}{sup {dagger}}. The split is useful because amplitudes involving {phi} have different analytic structure from those involving {phi}{sup {dagger}}. We compute the cut-containing pieces of the amplitudes using generalized unitarity. The remaining rational parts are obtained by on-shell recursion. Our results for H{anti q}q{anti Q}Q agree with previous semi-numerical computations. We also show how to convert existing semi-numerical results for the production of a scalar Higgs boson into analogous results for a pseudoscalar Higgs boson.
Date:
June 2, 2009
Creator:
Dixon, Lance J. & Sofianatos, Yorgos
Object Type:
Article
System:
The UNT Digital Library
Congressional Oversight and Related Issues Concerning International Security Agreements Concluded by the United States
This report begins by providing a general background on the types of international agreements that are binding upon the United States, as well as considerations affecting whether they take the form of a treaty or an executive agreement. Next, the report discusses historical precedents as to the role that security agreements have taken. The report discusses the oversight role that Congress exercises with respect to entering and implementing international agreements involving the United States.
Date:
June 2, 2009
Creator:
Garcia, Michael J. & Mason, R. C.
Object Type:
Report
System:
The UNT Digital Library
Costa Rica: Background and U.S. Relations
This report provides information about the Background and U.S. Relations of Costa Rica. Costa Rica has established a diverse economy with a strong export sector.
Date:
June 2, 2009
Creator:
Meyer, Peter J.
Object Type:
Report
System:
The UNT Digital Library
Costa Rica: Background and U.S. Relations
Costa Rica is a relatively politically stable and economically developed nation with a long tradition of civilian democracy. Once a predominantly agricultural nation, Costa Rica has established a diversified economy with a strong export sector. This report examines recent political and economic developments in Costa Rica as well as issues in U.S.-Costa Rica relations.
Date:
June 2, 2009
Creator:
Meyer, Peter J.
Object Type:
Report
System:
The UNT Digital Library
Covariance Spectroscopy for Fissile Material Detection
Nuclear fission produces multiple prompt neutrons and gammas at each fission event. The resulting daughter nuclei continue to emit delayed radiation as neutrons boil off, beta decay occurs, etc. All of the radiations are causally connected, and therefore correlated. The correlations are generally positive, but when different decay channels compete, so that some radiations tend to exclude others, negative correlations could also be observed. A similar problem of reduced complexity is that of cascades radiation, whereby a simple radioactive decay produces two or more correlated gamma rays at each decay. Covariance is the usual means for measuring correlation, and techniques of covariance mapping may be useful to produce distinct signatures of special nuclear materials (SNM). A covariance measurement can also be used to filter data streams because uncorrelated signals are largely rejected. The technique is generally more effective than a coincidence measurement. In this poster, we concentrate on cascades and the covariance filtering problem.
Date:
June 2, 2009
Creator:
Rusty Trainham, Jim Tinsley, Paul Hurley, Ray Keegan
Object Type:
Article
System:
The UNT Digital Library
Cuban Migration to the United States: Policy and Trends
This report opens with a historical analysis of the unique immigration policy that evolved with Cuba and an explanation of its nexus with other federal policies. It follows with time series analysis of Cuban migration trends. The report concludes by discussing current challenges and issues.
Date:
June 2, 2009
Creator:
Wasem, Ruth Ellen
Object Type:
Report
System:
The UNT Digital Library
Data Parallel Bin-Based Indexing for Answering Queries on Multi-Core Architectures
The multi-core trend in CPUs and general purpose graphics processing units (GPUs) offers new opportunities for the database community. The increase of cores at exponential rates is likely to affect virtually every server and client in the coming decade, and presents database management systems with a huge, compelling disruption that will radically change how processing is done. This paper presents a new parallel indexing data structure for answering queries that takes full advantage of the increasing thread-level parallelism emerging in multi-core architectures. In our approach, our Data Parallel Bin-based Index Strategy (DP-BIS) first bins the base data, and then partitions and stores the values in each bin as a separate, bin-based data cluster. In answering a query, the procedures for examining the bin numbers and the bin-based data clusters offer the maximum possible level of concurrency; each record is evaluated by a single thread and all threads are processed simultaneously in parallel. We implement and demonstrate the effectiveness of DP-BIS on two multi-core architectures: a multi-core CPU and a GPU. The concurrency afforded by DP-BIS allows us to fully utilize the thread-level parallelism provided by each architecture--for example, our GPU-based DP-BIS implementation simultaneously evaluates over 12,000 records with an equivalent …
Date:
June 2, 2009
Creator:
Gosink, Luke; Wu, Kesheng; Bethel, E. Wes; Owens, John D. & Joy, Kenneth I.
Object Type:
Article
System:
The UNT Digital Library
Determination of the Atmospheric Neutrino Flux and Searches for New Physics with AMANDA-II
The AMANDA-II detector, operating since 2000 in the deep ice at the geographic South Pole, has accumulated a large sample of atmospheric muon neutrinos in the 100 GeV to 10 TeV energy range. The zenith angle and energy distribution of these events can be used to search for various phenomenological signatures of quantum gravity in the neutrino sector, such as violation of Lorentz invariance (VLI) or quantum decoherence (QD). Analyzing a set of 5511 candidate neutrino events collected during 1387 days of livetime from 2000 to 2006, we find no evidence for such effects and set upper limits on VLI and QD parameters using a maximum likelihood method. Given the absence of evidence for new flavor-changing physics, we use the same methodology to determine the conventional atmospheric muon neutrino flux above 100 GeV.
Date:
June 2, 2009
Creator:
Collaboration, IceCube; Klein, Spencer & Collaboration, IceCube
Object Type:
Article
System:
The UNT Digital Library
Effects of Beam Filling Pattern on Beam Ion Instability and Beam Loading In PEP-X
A proposed high-brightness synchrotron light source (PEP-X) is under design at SLAC. The 4.5-GeV PEP-X storage ring has four theoretical minimum emittance (TME) cells to achieve the very low emittance and two double-bend achromat (DBA) cells to provide spaces for IDs. Damping wigglers will be installed in zero-dispersion straights to reduce the emittance below 0.1 nm. Ion induced beam instability is one critical issue due to its ultra small emittance. Third harmonic cavity can be used to lengthen the bunch in order to improve the beam's life time. Bunch-train filling pattern is proposed to mitigate both the fast ion instability and beam loading effect. This paper investigates the fast ion instability and beam loading for different beam filling patterns.
Date:
June 2, 2009
Creator:
Wang, L.
Object Type:
Article
System:
The UNT Digital Library
Espisodic detachment of Martian crustal magnetic fields leading to bulk atmospheric plasma escape
We present an analysis of magnetic field and suprathermal electron measurements from the Mars Global Surveyor (MGS) spacecraft that reveals isolated magnetic structures filled with Martian atmospheric plasma located downstream from strong crustal magnetic fields with respect to the flowing solar wind. The structures are characterized by magnetic field enhancements and rotations characteristic of magnetic flux ropes, and characteristic ionospheric electron energy distributions with angular distributions distinct from surrounding regions. These observations indicate that significant amounts of atmosphere are intermittently being carried away from Mars by a bulk removal process: the top portions of crustal field loops are stretched through interaction with the solar wind and detach via magnetic reconnection. This process occurs frequently and may account for as much as 10% of the total present-day ion escape from Mars.
Date:
June 2, 2009
Creator:
Brain, D A; Baker, A H; Briggs, J; Eastwood, J P; Halekas, J S & Phan, T
Object Type:
Article
System:
The UNT Digital Library
Final Report PIPELINING RDP DATA TO THE "TAXOMATIC"
This project builds on the results of previously funded research by integrating data and software that had been previously used in building resources used in the preparation of Bergey?s Manual of Systematic Bacteriology, 2nd Edition (Volumes 1 & 2A-C) and the Ribosomal Database Project-II (RDP-II) so as to both enhance the value of the data and create a pipeline approach to keeping the data current. Earlier, we demonstrated the value of using exploratory data analysis (EDA) to visualize large sets of sequence data (notably SSU rRNA gene sequences used in constructing a comprehensive phylogeny of prokaryotes. While the Self- Organizing Self-Correcting Classification (SOSCC) algorithms we developed were computationally efficient and useful for unraveling problems within the underlying data (e.g., identification of annotation errors, detection of unresolved synonymies, taxonomic and nomenclatural errors), bottlenecks at the preprocessing stage limited deployment of our applications as tools for end-users. To overcome the bottlenecks (which included hand alignment and computation of large matrices of pair-wise evolutionary distances), we proposed building a data pipeline between the ?Taxomatic? application and RDP-II. The objectives were to accelerate the production and distribution of the updated versions of the prokaryotic taxonomy in lock-step with publication of new taxa and rearrangement …
Date:
June 2, 2009
Creator:
Garrity, George
Object Type:
Report
System:
The UNT Digital Library
Freight Issues in Surface Transportation Reauthorization
None
Date:
June 2, 2009
Creator:
Frittelli, John & Mallett, William J.
Object Type:
Report
System:
The UNT Digital Library