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First JAM results on the determination of polarized parton distributions
The Jefferson Lab Angular Momentum (JAM) Collaboration is a new initiative to study the angular momentum dependent structure of the nucleon. First results on the determination of spin-dependent parton distribution functions at intermediate and large x from world data on polarized deep-inelastic scattering are presented. Different aspects of global QCD analysis are discussed, including the effects of nuclear structure of deuterium and {sup 3}He targets, target mass corrections and higher twist contributions to the g{sub 1} and g{sub 2} structure functions.
Date:
January 1, 2014
Creator:
Accardi, Alberto; Jimenez-Delgado, Pedro & Melnitchouk, Wally
Object Type:
Article
System:
The UNT Digital Library
Commentary on "Study of Assorted Interactions of an Ionic Liquid in Significant Solvent Systems using Compensated Equation of Fuoss Conductance and Vibrational Mode"
Article offering commentary on the article titled "Study of assorted interactions of an ionic liquid in significant solvent systems using compensated equation of fuoss conductance and vibrational mode."
Date:
May 1, 2014
Creator:
Acree, William E. (William Eugene)
Object Type:
Article
System:
The UNT Digital Library
Extracting TMDs from CLAS12 data
We present studies of double longitudinal spin asymmetries in semi-inclusive deep inelastic scattering using a new dedicated Monte Carlo generator, which includes quark intrinsic transverse momentum within the generalized parton model based on the fully differential cross section for the process. Additionally we employ Bessel-weighting to the MC events to extract transverse momentum dependent parton distribution functions and also discuss possible uncertainties due to kinematic correlation effects.
Date:
January 1, 2014
Creator:
Aghasyan, Mher M. & Avakian, Harut A.
Object Type:
Article
System:
The UNT Digital Library
Assessing the Costs of Climate Change and Adaptation in South Asia
.This Asian Development Bank (ADB) study examined the economic costs associated with the impacts of climate change and the cost and benefits of adaptation in Bangladesh,Bhutan, India, the Maldives, Nepal, and Sri Lanka. The study aimed to (i) assess the biophysical impacts of climate change in the region, including individual country impacts, and (ii) estimate the total economic loss to the countries in the region by 2100, taking into account the different scenarios and impacts projected across vulnerable sectors, and then to estimate the magnitude of funding for adaptation measures required to avert such potential losses. Results of the study will aid development of future policies and programs for climate change adaptation in the region, including initiatives for regional cooperation and capacity building in climate change management. The study covered the following sectors: agriculture, terrestrial ecosystems, water, marine and coastal resources (except Bhutan and Nepal), health, and energy.
Date:
June 1, 2014
Creator:
Ahmed, Mahfuz & Suphachol Suphachalasai
Object Type:
Text
System:
The UNT Digital Library
Export-Import Bank Reauthorization: Frequently Asked Questions
This report addresses frequently asked questions about Ex-Im Bank, grouped in the following categories: congressional interest and the Ex-Im Bank reauthorization debate; market context; international context; organizational structure and management; programs; statutory requirements and policies; risk management; budget and appropriations; implications of a sunset in authority; and historical and current approaches to reauthorization.
Date:
August 1, 2014
Creator:
Akhtar, Shayerah Ilias; Carpenter, David H.; Levit, Mindy R. & Taylor, Julia
Object Type:
Report
System:
The UNT Digital Library
Export-Import Bank Reauthorization: Frequently Asked Questions
This report addresses frequently asked questions about Ex-Im Bank, grouped in the following categories: congressional interest and the Ex-Im Bank reauthorization debate; market context; international context; organizational structure and management; programs; statutory requirements and policies; risk management; budget and appropriations; implications of a sunset in authority; and historical and current approaches to reauthorization.
Date:
August 1, 2014
Creator:
Akhtar, Shayerah Ilias; Levit, Mindy R. & Taylor, Julia
Object Type:
Report
System:
The UNT Digital Library
The Colony Courier-Leader (The Colony, Tex.), Vol. 33, No. 18, Ed. 1 Sunday, June 1, 2014
Weekly newspaper from The Colony, Texas that includes local, state, and national news along with advertising.
Date:
June 1, 2014
Creator:
Aldaz, Gina
Object Type:
Newspaper
System:
The Portal to Texas History
Data Mining Techniques for Predicting Breast Cancer Survivability Among Women in the United States
Poster for the 2014 UNT Graduate Exhibition in the Computer Science and Information Technology category. This poster discusses data mining techniques for predicting breast cancer survivability among women in the United States.
Date:
March 1, 2014
Creator:
Alshammari, Sultanah M.; Shah, Tawfiq M. & Huang, Yan
Object Type:
Poster
System:
The UNT Digital Library
Extraction of Transversity and Collins Functions
We present a global re-analysis of recent experimental data on azimuthal asymmetries in semi-inclusive deep inelastic scattering, from the HERMES and COMPASS Collaborations, and in e{sup +}e{sup -} --> h_1h_2X processes, from the Belle Collaboration. The transversity distribution and the Collins functions are extracted simultaneously, in a revised analysis which also takes into account a new parameterization of the unknown functions.
Date:
January 1, 2014
Creator:
Anselmino, Mauro; Boglione, Mariaelena; D'Alesio, Umberto; Melis, Stefano; Murgia, Francesco & Prokudin, Alexei
Object Type:
Article
System:
The UNT Digital Library
On the role of the Sivers effect in A{sub N} for inclusive particle production in pp collisions
Single spin asymmetries, A{sub N} , for inclusive particle production in pp collisions are considered within a generalized parton model with inclusion of spin and tranverse momentum effects. We consider the potential role of the Sivers effect in A{sub N} , as extracted from a careful analysis of azimuthal asymmetries in SIDIS, and discuss its phenomenological consequences in connection with a recently updated study of the Collins effect.
Date:
January 1, 2014
Creator:
Anselmino, Mauro; Boglione, Mariaelena; D'Alesio, Umberto; Melis, Stefano; Murgia, Francesco & Prokudin, Alexei
Object Type:
Article
System:
The UNT Digital Library
Daily Tribune (Mount Pleasant, Tex.), Vol. 140, No. 128, Ed. 1 Tuesday, July 1, 2014
Daily newspaper from Mount Pleasant, Texas that includes local, state, and national news along with advertising.
Date:
July 1, 2014
Creator:
Antonelli, Lou & Borders, Gary
Object Type:
Newspaper
System:
The Portal to Texas History
Daily Tribune (Mount Pleasant, Tex.), Vol. 140, No. 151, Ed. 1 Friday, August 1, 2014
Daily newspaper from Mount Pleasant, Texas that includes local, state, and national news along with advertising.
Date:
August 1, 2014
Creator:
Antonelli, Lou & Borders, Gary
Object Type:
Newspaper
System:
The Portal to Texas History
Daily Tribune (Mount Pleasant, Tex.), Vol. 140, No. 194, Ed. 1 Wednesday, October 1, 2014
Daily newspaper from Mount Pleasant, Texas that includes local, state, and national news along with advertising.
Date:
October 1, 2014
Creator:
Antonelli, Lou & Borders, Gary
Object Type:
Newspaper
System:
The Portal to Texas History
U.S.-EU Cooperation Against Terrorism
This report examines the evolution of counterterrorism cooperation between the United States and the European Union (EU), particularly since the September 11, 2001 terrorist attacks. It includes a discussion of U.S.-EU cooperation progress and ongoing challenges, as well as perspectives and issues for Congress.
Date:
December 1, 2014
Creator:
Archick, Kristin
Object Type:
Report
System:
The UNT Digital Library
A determination of the spatial concordance between Lyme disease incidence and habitat probability of its primary vector Ixodes scapularis (black-legged tick)
This article involves mapping the probability of occurrence that the disease vector exists in the environment, mapping the incidence of Lyme disease in the human population and examining the spatial concordance between the probability map and incidence map.
Date:
November 1, 2014
Creator:
Atkinson, Samuel F.; Sarkar, Sahotra; Avina, Aldo; Schuermann, Jim A. & Williamson, Phillip C.
Object Type:
Article
System:
The UNT Digital Library
Studies of the 3D structure of the proton at Jlab
In recent years parton distributions, describing longitudinal momentum, helicity and transversity distributions of quarks and gluons, have been generalized to account also for transverse degrees of freedom. Two new sets of more general distributions, Transverse Momentum Distributions (TMDs) and Generalized Parton Distributions (GPDs) were introduced to describe transverse momentum and spatial distributions of partons. Great progress has been made since then in measurements of different Single Spin Asymmetries (SSAs) in semi-inclusive and hard exclusive processes, providing access to TMDs and GPDs, respectively. Studies of TMDs and GPDs are also among the main driving forces of the JLab 12 GeV upgrade project.
Date:
January 1, 2014
Creator:
Avakian, Harut A.
Object Type:
Article
System:
The UNT Digital Library
Cladding Attachment Over Thick Exterior Insulating Sheathing
The addition of insulation to the exterior of buildings is an effective means of increasing the thermal resistance of both wood framed walls as well as mass masonry wall assemblies. For thick layers of exterior insulation (levels greater than 1.5 inches), the use of wood furring strips attached through the insulation back to the structure has been used by many contractors and designers as a means to provide a convenient cladding attachment location (Straube and Smegal 2009, Pettit 2009, Joyce 2009, Ueno 2010). The research presented in this report is intended to help develop a better understanding of the system mechanics involved and the potential for environmental exposure induced movement between the furring strip and the framing. BSC sought to address the following research questions: 1. What are the relative roles of the mechanisms and the magnitudes of the force that influence the vertical displacement resistance of the system? 2. Can the capacity at a specified deflection be reliably calculated using mechanics based equations? 3. What are the impacts of environmental exposure on the vertical displacement of furring strips attached directly through insulation back to a wood structure?
Date:
January 1, 2014
Creator:
Baker, P.; Eng, P. & Lepage, R.
Object Type:
Report
System:
The UNT Digital Library
Time Domain Partitioning of Electricity Production Cost Simulations
Production cost models are often used for planning by simulating power system operations over long time horizons. The simulation of a day-ahead energy market can take several weeks to compute. Tractability improvements are often made through model simplifications, such as: reductions in transmission modeling detail, relaxation of commitment variable integrality, reductions in cost modeling detail, etc. One common simplification is to partition the simulation horizon so that weekly or monthly horizons can be simulated in parallel. However, horizon partitions are often executed with overlap periods of arbitrary and sometimes zero length. We calculate the time domain persistence of historical unit commitment decisions to inform time domain partitioning of production cost models. The results are implemented using PLEXOS production cost modeling software in an HPC environment to improve the computation time of simulations while maintaining solution integrity.
Date:
January 1, 2014
Creator:
Barrows, C.; Hummon, M.; Jones, W. & Hale, E.
Object Type:
Report
System:
The UNT Digital Library
A portable cryostat for the cold transfer of polarized solid HD targets: HDice-I
A device has been developed with moveable liquid nitrogen and liquid helium volumes that is capable of reaching over two meters into the coldest regions of a cryostat or dilution refrigerator and reliably extracting or installing a target of solid, polarized hydrogen deuteride (HD). This Transfer Cryostat incorporates a cylindrical neodymium rare-earth magnet that is configured as a Halbach dipole, which is maintained at 77 K and produces a 0.1 T field around the HD target. Multiple layers provide a hermetic 77 K-shield as the device is used to maintain a target at 2 K during a transfer between cryostats. Tests with frozen-spin HD show negligible polarization loss for either H or D over typical transfer periods. Multiple target transfers with this apparatus have shown an overall reliability of about 95% per transfer, which is a significant improvement over earlier versions of the device.
Date:
February 1, 2014
Creator:
Bass, Christopher D.; Sandorfi, Andy M.; Bade, C.; Blecher, M.; Caracappa, A.; D'Angelo, A. et al.
Object Type:
Article
System:
The UNT Digital Library
Integrated Performance Testing Workshop - Supplemental Materials (Scripts and Procedures)
A variety of performance tests are described relating to: Material Transfers; Emergency Evacuation; Alarm Response Assessment; and an Enhanced Limited Scope Performance Test (ELSPT). Procedures are given for: nuclear material physical inventory and discrepancy; material transfers; and emergency evacuation.
Date:
February 1, 2014
Creator:
Baum, Gregory A.
Object Type:
Text
System:
The UNT Digital Library
Stephenville Empire-Tribune (Stephenville, Tex.), Vol. 114, No. 60, Ed. 1 Tuesday, April 1, 2014
Daily newspaper from Stephenville, Texas that includes local, state, and national news along with advertising.
Date:
April 1, 2014
Creator:
Berge, Sara Vanden
Object Type:
Newspaper
System:
The Portal to Texas History
HTR-PROTEUS PEBBLE BED EXPERIMENTAL PROGRAM CORES 9 & 10: COLUMNAR HEXAGONAL POINT-ON-POINT PACKING WITH A 1:1 MODERATOR-TO-FUEL PEBBLE RATIO
PROTEUS is a zero-power research reactor based on a cylindrical graphite annulus with a central cylindrical cavity. The graphite annulus remains basically the same for all experimental programs, but the contents of the central cavity are changed according to the type of reactor being investigated. Through most of its service history, PROTEUS has represented light-water reactors, but from 1992 to 1996 PROTEUS was configured as a pebble-bed reactor (PBR) critical facility and designated as HTR-PROTEUS. The nomenclature was used to indicate that this series consisted of High Temperature Reactor experiments performed in the PROTEUS assembly. During this period, seventeen critical configurations were assembled and various reactor physics experiments were conducted. These experiments included measurements of criticality, differential and integral control rod and safety rod worths, kinetics, reaction rates, water ingress effects, and small sample reactivity effects (Ref. 3). HTR-PROTEUS was constructed, and the experimental program was conducted, for the purpose of providing experimental benchmark data for assessment of reactor physics computer codes. Considerable effort was devoted to benchmark calculations as a part of the HTR-PROTEUS program. References 1 and 2 provide detailed data for use in constructing models for codes to be assessed. Reference 3 is a comprehensive summary of …
Date:
March 1, 2014
Creator:
Bess, John D.
Object Type:
Report
System:
The UNT Digital Library
NEUTRON RADIOGRAPHY (NRAD) REACTOR 64-ELEMENT CORE UPGRADE
The neutron radiography (NRAD) reactor is a 250 kW TRIGA (registered) (Training, Research, Isotopes, General Atomics) Mark II , tank-type research reactor currently located in the basement, below the main hot cell, of the Hot Fuel Examination Facility (HFEF) at the Idaho National Laboratory (INL). It is equipped with two beam tubes with separate radiography stations for the performance of neutron radiography irradiation on small test components. The interim critical configuration developed during the core upgrade, which contains only 62 fuel elements, has been evaluated as an acceptable benchmark experiment. The final 64-fuel-element operational core configuration of the NRAD LEU TRIGA reactor has also been evaluated as an acceptable benchmark experiment. Calculated eigenvalues differ significantly (approximately +/-1%) from the benchmark eigenvalue and have demonstrated sensitivity to the thermal scattering treatment of hydrogen in the U-Er-Zr-H fuel.
Date:
March 1, 2014
Creator:
Bess, John D.
Object Type:
Report
System:
The UNT Digital Library
HTR-PROTEUS PEBBLE BED EXPERIMENTAL PROGRAM CORE 4: RANDOM PACKING WITH A 1:1 MODERATOR-TO-FUEL PEBBLE RATIO
In its deployment as a pebble bed reactor (PBR) critical facility from 1992 to 1996, the PROTEUS facility was designated as HTR-PROTEUS. This experimental program was performed as part of an International Atomic Energy Agency (IAEA) Coordinated Research Project (CRP) on the Validation of Safety Related Physics Calculations for Low Enriched HTGRs. Within this project, critical experiments were conducted for graphite moderated LEU systems to determine core reactivity, flux and power profiles, reaction-rate ratios, the worth of control rods, both in-core and reflector based, the worth of burnable poisons, kinetic parameters, and the effects of moisture ingress on these parameters. One benchmark experiment was evaluated in this report: Core 4. Core 4 represents the only configuration with random pebble packing in the HTR-PROTEUS series of experiments, and has a moderator-to-fuel pebble ratio of 1:1. Three random configurations were performed. The initial configuration, Core 4.1, was rejected because the method for pebble loading, separate delivery tubes for the moderator and fuel pebbles, may not have been completely random; this core loading was rejected by the experimenters. Cores 4.2 and 4.3 were loaded using a single delivery tube, eliminating the possibility for systematic ordering effects. The second and third cores differed slightly …
Date:
March 1, 2014
Creator:
Bess, John D. & Montierth, Leland M.
Object Type:
Report
System:
The UNT Digital Library