Degree Department

89 Matching Results

Results open in a new window/tab.

Economic Development: Formal Monitoring Approaches Needed to Help Ensure Compliance with Restrictions on Funding Employer Relocations (open access)

Economic Development: Formal Monitoring Approaches Needed to Help Ensure Compliance with Restrictions on Funding Employer Relocations

A letter report issued by the Government Accountability Office with an abstract that begins "Congress imposed restrictions on some federal programs to prevent funding of business relocations. Congress expressed concerns about state and local governments using federal funds to attract jobs to one community at a loss of jobs to another and about compliance with relocation restrictions. This report (1) identifies large federal economic development programs that state and local governments can use as incentives, (2) identifies which programs contain statutory prohibitions on funding relocations, and (3) assesses whether federal agencies had established and implemented procedures to help ensure compliance with prohibitions. To address these objectives, GAO searched federal databases, reviewed relevant statutes and regulations, and conducted limited testing of agency procedures."
Date: September 10, 2007
Creator: United States. Government Accountability Office.
Object Type: Report
System: The UNT Digital Library
Critical Infrastructure Protection: Multiple Efforts to Secure Control Systems Are Under Way, but Challenges Remain (open access)

Critical Infrastructure Protection: Multiple Efforts to Secure Control Systems Are Under Way, but Challenges Remain

A letter report issued by the Government Accountability Office with an abstract that begins "Control systems--computer-based systems that monitor and control sensitive processes and physical functions--perform vital functions in many of our nation's critical infrastructures, including electric power, oil and gas, water treatment, and chemical production. The disruption of control systems could have a significant impact on public health and safety, which makes securing them a national priority. GAO was asked to (1) determine cyber threats, vulnerabilities, and the potential impact of attacks on critical infrastructure control systems; (2) determine the challenges to securing these systems; (3) identify private sector initiatives to strengthen the cybersecurity of control systems; and (4) assess the adequacy of public sector initiatives to strengthen the cybersecurity of control systems. To address these objectives, we met with federal and private sector officials to identify risks, initiatives, and challenges. We also compared agency plans to best practices for securing critical infrastructures."
Date: September 10, 2007
Creator: United States. Government Accountability Office.
Object Type: Report
System: The UNT Digital Library
Information Technology: DHS's Human Capital Plan Is Largely Consistent with Relevant Guidance, but Improvements and Implementation Steps Are Still Needed (open access)

Information Technology: DHS's Human Capital Plan Is Largely Consistent with Relevant Guidance, but Improvements and Implementation Steps Are Still Needed

A letter report issued by the Government Accountability Office with an abstract that begins "In performing its missions, the Department of Homeland Security (DHS) relies extensively on information technology (IT). Recognizing this, DHS's fiscal year 2006 appropriations act required its Chief Information Officer (CIO) to submit a report to congressional appropriations committees that includes, among other things, an IT human capital plan, and the act directs GAO to review the report. GAO's review addressed (1) whether the IT human capital plan is consistent with federal guidance and associated best practices and (2) the status of the plan's implementation. In performing its review, GAO compared DHS's plan and supporting documentation with 27 practices in the Human Capital Assessment and Accountability Framework of the Office of Personnel Management, and examined plan implementation activities at three DHS component agencies."
Date: September 10, 2007
Creator: United States. Government Accountability Office.
Object Type: Report
System: The UNT Digital Library
Agricultural Conservation: Farm Program Payments Are an Important Factor in Landowners' Decisions to Convert Grassland to Cropland (open access)

Agricultural Conservation: Farm Program Payments Are an Important Factor in Landowners' Decisions to Convert Grassland to Cropland

A letter report issued by the Government Accountability Office with an abstract that begins "The nation's remaining grassland has several important benefits, such as providing land for grazing and wildlife habitat for many at-risk species. However, over the past 3 centuries about half of the grassland has been converted to other uses, principally cropland. In addition to losing important grassland values, such conversions may result in increased spending on federal farm programs, such as crop insurance, especially in marginal areas. GAO examined (1) the extent of grassland conversions to cropland and the cost of farm program payments for these newly converted cropland acres; (2) the relative importance of farm program payments versus other factors in producers' decisions to convert grassland to cropland; and (3) any impact the Sodbuster conservation provision--which places soil erosion standards on certain converted land--has had on limiting grassland conversions."
Date: September 10, 2007
Creator: United States. Government Accountability Office.
Object Type: Report
System: The UNT Digital Library
Extraterritorial Application of American Criminal Law (open access)

Extraterritorial Application of American Criminal Law

Crime is ordinarily proscribed, tried and punished according to the laws on the place where it occurs. American criminal law applies beyond the geographical confines of the United States, however, under some limited circumstances. The federal exceptions to the general rule usually involve crimes like drug trafficking, terrorism, or crimes committed aboard a ship or airplane. State prosecution for overseas misconduct is limited almost exclusively to multijurisdictional crimes, i.e., crimes where some elements of the offense are committed within the state and others are committed abroad. The Constitution, Congress, and state law define the circumstances under which American criminal law may be used against crimes occurring, in whole or in part, outside the United States
Date: September 10, 2007
Creator: Doyle, Charles
Object Type: Report
System: The UNT Digital Library
The polarized SRF gun experiment. (open access)

The polarized SRF gun experiment.

RF electron guns are capable of producing electron bunches with high brightness, which outperform DC electron guns and may even be able to provide electron beams for the ILC without the need for a damping ring. However, all successful existing guns for polarized electrons are DC guns because the environment inside an RF gun is hostile to the GaAs cathode material necessary for polarization. While the typical vacuum pressure in a DC gun is better than 10{sup -11} torr the vacuum in an RF gun is in the order of 10{sup -9} torr. Experiments at BINP Novosibirsk show that this leads to strong ion back-bombardment and generation of dark currents, which destroy the GaAs cathode in a short time. The situation might be much more favorable in a (super-conducting) SRF gun. The cryogenic pumping of the gun cavity walls may make it possible to maintain a vacuum close to 10{sup -12} torr, solving the problem of ion bombardment and dark currents. Of concern would be contamination of the gun cavity by evaporating cathode material. This report describes an experiment that Brookhaven National Laboratory (BNL) in collaboration with Advanced Energy Systems (AES) is conducting to answer these questions.
Date: September 10, 2007
Creator: Kewisch, J.; Ben-Zvi, Ilan; Rao, T.; Burrill, A.; Pate, D.; Grover, R. et al.
Object Type: Article
System: The UNT Digital Library
Nuclear Dynamics in Resonant Electron Collisions with SmallPolyatomic Molecules (open access)

Nuclear Dynamics in Resonant Electron Collisions with SmallPolyatomic Molecules

None
Date: September 10, 2007
Creator: Rescigno, Thomas N.; McCurdy, C. William; Haxton, Daniel J.; Trevisan, Cynthia S. & Orel, Ann E.
Object Type: Article
System: The UNT Digital Library
Analysis of Images from Experiments Investigating Fragmentation of Materials (open access)

Analysis of Images from Experiments Investigating Fragmentation of Materials

Image processing techniques have been used extensively to identify objects of interest in image data and extract representative characteristics for these objects. However, this can be a challenge due to the presence of noise in the images and the variation across images in a dataset. When the number of images to be analyzed is large, the algorithms used must also be relatively insensitive to the choice of parameters and lend themselves to partial or full automation. This not only avoids manual analysis which can be time consuming and error-prone, but also makes the analysis reproducible, thus enabling comparisons between images which have been processed in an identical manner. In this paper, we describe our approach to extracting features for objects of interest in experimental images. Focusing on the specific problem of fragmentation of materials, we show how we can extract statistics for the fragments and the gaps between them.
Date: September 10, 2007
Creator: Kamath, C & Hurricane, O
Object Type: Report
System: The UNT Digital Library
Final Hazard Categorization for the Remediation of the 116-C-3 Chemical Waste Tanks (open access)

Final Hazard Categorization for the Remediation of the 116-C-3 Chemical Waste Tanks

This final hazard categorization (FHC) document examines the hazards, identifies appropriate controls to manage the hazards, and documents the commitments for the 116-C-3 Chemical Waste Tanks Remediation Project. The remediation activities analyzed in this FHC are based on recommended treatment and disposal alternatives described in the Engineering Evaluation for the Remediation to the 116-C-3 Chemical Waste Tanks (BHI 2005e).
Date: September 10, 2007
Creator: Blakley, T. M. & Schofield, W. D.
Object Type: Report
System: The UNT Digital Library
Recent Progress in a Beam-Beam Simulation Code for Circular Hadron Machines (open access)

Recent Progress in a Beam-Beam Simulation Code for Circular Hadron Machines

While conventional tracking codes can readily provide higher-order optical quantities and give an estimate of dynamic apertures, they are unable to provide directly measurable quantities such as lifetimes and loss rates. The particle tracking framework Plibb aims at modeling a storage ring with sufficient accuracy and a sufficiently high number of turns and in the presence of beam-beam interactions to allow for an estimate of these quantities. We provide a description of new features of the codes; we also describe a novel method of treating chromaticity in ring sections in a symplectic fashion.
Date: September 10, 2007
Creator: Kabel, Andreas; Fischer, Wolfram & Sen, Tanaji
Object Type: Article
System: The UNT Digital Library
Ionization of polarized 3He+ ions in EBIS trap with slanted electrostatic mirror. (open access)

Ionization of polarized 3He+ ions in EBIS trap with slanted electrostatic mirror.

Methods of producing the nuclear polarized {sup 3}He{sup +} ions and their ionization to {sup 3}H{sup ++} in ion trap of the electron Beam Ion Source (EBIS) are discussed. Computer simulations show that injection and accumulation of {sup 3}He{sup +} ions in the EBIS trap with slanted electrostatic mirror can be very effective for injection times longer than the ion traversal time through the trap.
Date: September 10, 2007
Creator: Pikin, A.; Zelenski, A.; Kponou, A.; Alessi, J.; Beebe, E.; Prelee, K. et al.
Object Type: Article
System: The UNT Digital Library
p-Carbon polarimetry at RHIC. (open access)

p-Carbon polarimetry at RHIC.

The polarization measurement through elastic ({rvec p},C) reaction plays a crucial role in the polarized proton beam operation of Relativistic Heavy Ion collider at Brookhaven National Laboratory. As well as measuring the polarization, the unknown analyzing power A{sub N} of elastic ({rvec p},C) is determined as well in combination with the absolute polarization measurement by a H-jet polarimeter. The systematic uncertainty of the Run05 measurements are discussed as well as introducing the experimental apparatus of the polarimeter system.
Date: September 10, 2007
Creator: Nakagawa,I.; Makdisi,Y.; Alekseev, I.; Bazilesky, A.; Bravar, A.; Bunce, G. et al.
Object Type: Article
System: The UNT Digital Library
HIGH ENERGY HADRON POLARIMETRY. (open access)

HIGH ENERGY HADRON POLARIMETRY.

Proton polarimetry at RHIC uses the interference of electromagnetic (EM) and hadronic scattering amplitudes. The EM spin-flip amplitude for protons is responsible for the proton's anomalous magnetic moment, and is large. This then generates a significant analyzing power for small angle elastic scattering. RHIC polarimetry has reached a 5% uncertainty on the beam polarization, and seem capable of reducing this uncertainty further. Polarized neutron beams ax also interesting for RHIC and for a polarized electron-polarized proton/ion collider in the fume. In this case, deuterons, for example, have a very small anomalous magnetic moment, making the approach used for protons impractical. Although it might be possible to use quasielastic scattering from the protons in the deuteron to monitor the polarization. 3-He beams can provide polarized neutrons, and do have a large anomalous magnetic moment, making a similar approach to proton polarimetry possible.
Date: September 10, 2007
Creator: BUNCE,G.
Object Type: Article
System: The UNT Digital Library
Absolute Polarimetry at RHIC (open access)

Absolute Polarimetry at RHIC

Precise and absolute beam polarization measurements are critical for the RHIC spin physics program. Because all experimental spin-dependent results are normalized by beam polarization, the normalization uncertainty contributes directly to final physics uncertainties. We aimed to perform the beam polarization measurement to an accuracy Of {Delta}P{sub beam}/P{sub beam} < 5%. The absolute polarimeter consists of Polarized Atomic Hydrogen Gas Jet Target and left-right pairs of silicon strip detectors and was installed in the RHIC-ring in 2004. This system features proton-proton elastic scattering in the Coulomb nuclear interference (CNI) region. Precise measurements of the analyzing power A{sub N} of this process has allowed us to achieve {Delta}P{sub beam}/P{sub beam} = 4.2% in 2005 for the first long spin-physics run. In this report, we describe the entire set up and performance of the system. The procedure of beam polarization measurement and analysis results from 2004-2005 are described. Physics topics of AN in the CNI region (four-momentum transfer squared 0.001 < -t < 0.032 (GeV/c){sup 2}) are also discussed. We point out the current issues and expected optimum accuracy in 2006 and the future.
Date: September 10, 2007
Creator: Okada, H.; Bravar, A.; Bunce, G.; Gill, R.; Huang, H.; Makdisi, Y. et al.
Object Type: Article
System: The UNT Digital Library
Sona transition studies in the RHIC OPPIS. (open access)

Sona transition studies in the RHIC OPPIS.

In Optically Pumped Polarized Ion Sources (OPPIS), the atomic beam is first electron polarized, and then this polarization is transferred to the nucleus by a suitable perturbing magnetic field. In the BNL OPPIS, the electron polarized atomic beam experiences the perturbing field when it traverses a region where the axial magnetic field reverses direction in a controlled manner, strength and gradient. This is the so-called Sona Transition region, named after P. G. Sona, who fist suggested the technique. We have extensively studied how the magnetic field profile in the Sona region affects beam polarization. In these studies, we have observed oscillations in polarization for certain field profiles, and tried to explain them. We report on these studies.
Date: September 10, 2007
Creator: Kponou,A.; Zelenski, A.; Kokhanovski, S. & Zubets, V.
Object Type: Article
System: The UNT Digital Library
The RHIC Optically-Pumped Polarized H Ion Source. (open access)

The RHIC Optically-Pumped Polarized H Ion Source.

The depolarization factors in the multi-step spin-transfer polarization technique and basic limitations on maximum polarization in the OPPIS (Optically-Pumped Polarized H{sup -} Ion Source) are discussed. Detailed studies of polarization losses in the RHIC OPPIS and the source parameters optimization resulted in the OPPIS polarization increase to 86-90%. This contributed to increasing polarization in the AGS and RHIC to 65-70%.
Date: September 10, 2007
Creator: Zelenski,A.; Zelenski, A.; Kokhanovski, S.; Kponou, A.; Ritter, J. & Zubets, V.
Object Type: Article
System: The UNT Digital Library
Storage and Aging Effects on Spherical Resorcinol-Formaldehyde Resin Ion Exchange Performance (open access)

Storage and Aging Effects on Spherical Resorcinol-Formaldehyde Resin Ion Exchange Performance

Bechtel National, Inc. (BNI) is evaluating the alternate Cs ion exchanger, spherical resorcinol-formaldehyde (RF), for use in the River Protection Project-Waste Treatment Plant (RPP-WTP).( ) Previous test activities with spherical RF indicate that it has adequate capacity, selectivity, and kinetics to perform in the plant according to the flowsheet needs. It appears to have better elution and hydraulic properties than the existing alternatives: ground-gel RF and SuperLig® 644 (SL 644).( ) To date, the spherical RF performance testing has been conducted on freshly manufactured resin (within ~2 months of manufacture). The ion exchange resins will be manufactured and shipped to the WTP up to 1 year before being used in the plant. Changes in the resin properties during storage could reduce the capacity of the resin to remove Cs from low-activity waste solutions. Active sites on organic SL-644 resin have been shown to degrade during storage (Arm et al. 2004). Additional testing was needed to study the effects of storage conditions and aging on spherical RF ion exchange performance. Variables that could have a significant impact on ion exchange resins during storage include storage temperature, medium, and time. Battelle—Pacific Northwest Division (PNWD) was contracted to test the effects of various …
Date: September 10, 2007
Creator: Fiskum, Sandra K.; Arm, Stuart T.; Edwards, Matthew K.; Steele, Marilyn J. & Thomas, Kathie K.
Object Type: Report
System: The UNT Digital Library
Design of a free-electron laser driven by the LBNLlaser-plasma-accelerator (open access)

Design of a free-electron laser driven by the LBNLlaser-plasma-accelerator

We discuss the design and current status of a compactfree-electron laser (FEL), generating ultra-fast, high-peak flux, VUVpulses driven by a high-current, GeV electron beam from the existingLawrence Berkeley National Laboratory (LBNL) laser-plasma accelerator,whose active acceleration length is only a few cm. The proposedultra-fast source would be intrinsically temporally synchronized to thedrive laser pulse, enabling pump-probe studies in ultra-fast science withpulse lengths of tens of fs. Owing to the high current (&10 kA) ofthe laser-plasma-accelerated electron beams, saturated output fluxes arepotentially greater than 1013 photons/pulse. Devices based both on SASEand high-harmonic generated input seeds, to reduce undulator length andfluctuations, are considered.
Date: September 10, 2007
Creator: Schroeder, C. B.; Fawley, W. M.; Montgomery, A. L.; Robinson, K. E.; Gruner, F.; Bakeman, M. et al.
Object Type: Article
System: The UNT Digital Library
Isothermal Martensitic and Pressure-Induced ? to ?? Phase Transformations in a Pu-Ga Alloy (open access)

Isothermal Martensitic and Pressure-Induced ? to ?? Phase Transformations in a Pu-Ga Alloy

A Pu-2 at.% Ga alloy specimen is slowly compressed to {approx}1 GPa in a large volume moissanite anvil cell to induce the face-centered cubic {delta} to simple monoclinic {alpha}{prime} phase transformation. Optical microscopy, x-ray diffraction, and transmission electron microscopy of the specimen recovered to ambient pressure reveal that the vast majority of the microstructure consists of the {alpha}{prime} phase with grain sizes ranging from 10 nm to several hundred nm, with the remainder being {delta} phase dispersed between the {alpha}{prime} grains. This morphology is in contrast to the transformation product of the low-temperature isothermal martensite in which the lath-shaped {alpha}{prime} particles are {approx}20 {micro}m by 2 {micro}m.
Date: September 10, 2007
Creator: Schwartz, A. J.; Wall, M. A.; Farber, D. L.; Moore, K. T. & Blobaum, K. M.
Object Type: Article
System: The UNT Digital Library
Prospects for Acceleration of Deuterons and Helions. (open access)

Prospects for Acceleration of Deuterons and Helions.

In order to study the spin structure of the neutron at high energy, a beam rich in polarized neutrons needs to be developed. The neutron has no charge and cannot be accelerated, so either deuterons or helions must be considered. When it comes to spin manipulation and stability of the polarization in a circular accelerator, it is the anomalous part of the magnetic moment which is important. If the anomaly is too small, then manipulation becomes difficult as in the case of deuterons--spin rotators and Siberian snakes become ineffective. {sup 3}He nuclei appear to be the easiest choice for a polarized neutron beam. In this paper I discuss the prospects for both helions and deuterons as polarized beams in RHIC or in an electron-ion collider.
Date: September 10, 2007
Creator: MacKay, W. W.
Object Type: Article
System: The UNT Digital Library
Measuring the proton beam polarization from the source to RHIC. (open access)

Measuring the proton beam polarization from the source to RHIC.

Polarimeters are necessary tools for measuring the beam polarization during the acceleration process as well as a yardstick for performing spin physics experiments. In what follows, I will describe the principles of measuring the proton beam polarization and the techniques that are employed at various energies. I will present a tour of the polarimetry employed at the BNL Relativistic Heavy Ion collider (RHIC) polarized proton complex as it spans the full spectrum from the source to collider energies.
Date: September 10, 2007
Creator: Makdisi,Y.
Object Type: Article
System: The UNT Digital Library
Polarized Proton Acceleration in AGS and RHIC (open access)

Polarized Proton Acceleration in AGS and RHIC

As the first hadron accelerator and collider consisting of two independent superconducting rings RHIC has operated with a wide range of beam energies and particle species including polarized proton beams. The acceleration of polarized beams in both the injector and the collider rings is complicated by numerous depolarizing spin resonances. Partial and full Siberian snakes have made it possible to overcome the depolarization and beam polarizations of up to 65% have been reached at 100 GeV in RHIC.
Date: September 10, 2007
Creator: Roser, T.
Object Type: Article
System: The UNT Digital Library
Managing Electronic Waste: An Analysis of State E-Waste Legislation (open access)

Managing Electronic Waste: An Analysis of State E-Waste Legislation

As more states propose e-waste legislation, potentially regulated stakeholders (particularly electronics manufacturers and retailers) have expressed concern that they will be required to comply with a patchwork of state requirements throughout the United States. This concern has led to an increased call for federal legislation regarding e-waste management. To help policy makers better understand the impact of state e-waste legislation, this report discusses issues that have led to state action, common elements in state-waste laws and proposals, and an overview of each enacted state law.
Date: September 10, 2007
Creator: Luther, Linda
Object Type: Report
System: The UNT Digital Library
Markup in Senate Committee: Choosing a Text (open access)

Markup in Senate Committee: Choosing a Text

None
Date: September 10, 2007
Creator: unknown
Object Type: Report
System: The UNT Digital Library