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Binder/HMX interaction in PBX9501 at Elevated Temperatures (open access)

Binder/HMX interaction in PBX9501 at Elevated Temperatures

Plastic bonded explosives (PBX) generally consist of 85 - 95 % by weight energetic material, such as HMX, and 5 - 15 % polymeric binder. Understanding of the structure and morphology at elevated temperatures and pressures is important for predicting of PBX behavior in accident scenarios. The crystallographic behavior of pure HMX has been measured as functions of temperature and grain size. The investigation is extended to the high temperature behavior of PBX 9501 (95% HMX, 2.5 % Estane, 2.5 % BDNPA/F). The results show that the HMX {beta}-phase to {delta}-phase transition in PBX 9501 is similar to that in neat HMX. However, in the presence of the PBX 9501 binder, {delta}-phase HMX readily converts back to {beta}-phase during cooling. Using the same temperature profile, the conversion rate decreases for each subsequent heating and cooling cycle. As observed in earlier experiments, no reverse conversion is observed without the polymer binder. It is proposed that the reversion of {delta}-phase to {beta}-phase is due to changes in the surface molecular potential caused by the influence of the polymer binder on the surface molecules of the {delta}-phase. Upon thermal cycling, the polymer binder segregates from the HMX particles and thus reduces the influence …
Date: October 2, 2003
Creator: K., S C & M., T C
Object Type: Article
System: The UNT Digital Library
As-built model generation for a cylindrical test object (open access)

As-built model generation for a cylindrical test object

The goal of the As Built Model Development (ABMD) project in ADAPT is to determine how to produce finite element (FEM) meshes from information obtained from nondestructive inspection of parts and assemblies. These meshes could then be used in computational analysis tools to predict the actual performance of the parts, as opposed to the design performance that is obtained using meshes derived from design information. Information derived from several inspection methods could be used to derive the meshes, with some methods sensitive to geometry and others to material properties.
Date: October 2, 2003
Creator: Chambers, D. H.; Goodman, D. M. & Leach, R. R.
Object Type: Report
System: The UNT Digital Library
The Canadian Record (Canadian, Tex.), Vol. 113, No. 40, Ed. 1 Thursday, October 2, 2003 (open access)

The Canadian Record (Canadian, Tex.), Vol. 113, No. 40, Ed. 1 Thursday, October 2, 2003

Weekly newspaper from Canadian, Texas that includes local, state and national news along with some advertising.
Date: October 2, 2003
Creator: Brown, Laurie Ezzell
Object Type: Newspaper
System: The Portal to Texas History
Capital Income Tax Revisions and Effective Tax Rates (open access)

Capital Income Tax Revisions and Effective Tax Rates

This report discusses several temporary provisions affecting the taxation of capital income that were adopted in the 2001-2003 period. These provisions include lower individual tax rates, bonus depreciation, and lower individual income tax rates on dividends and capital gains.
Date: October 2, 2003
Creator: Gravelle, Jane G.
Object Type: Report
System: The UNT Digital Library
Clean Water Act Issues in the 108th Congress (open access)

Clean Water Act Issues in the 108th Congress

In this report several other Clean Water Act issues are likely to receive congressional attention, through oversight hearings and possibly in legislative proposals. Among the topics of interest is whether and how the Administration will revise the current program for restoration of pollution-impaired waters (the Total Maximum Daily Load, or TMDL program), in view of controversy over regulatory changes made during the Clinton Administration and continuing disagreement among states, cities, industry, and environmental advocates about program effectiveness and efficiency.
Date: October 2, 2003
Creator: Copeland, Claudia
Object Type: Report
System: The UNT Digital Library
Comanche Chief (Comanche, Tex.), No. 22, Ed. 1 Thursday, October 2, 2003 (open access)

Comanche Chief (Comanche, Tex.), No. 22, Ed. 1 Thursday, October 2, 2003

Weekly newspaper from Comanche, Texas that includes local, state, and national news along with advertising.
Date: October 2, 2003
Creator: Wilkerson, James C., III
Object Type: Newspaper
System: The Portal to Texas History
Commercial Spent Nuclear Fuel Waste Package Misload Analysis (open access)

Commercial Spent Nuclear Fuel Waste Package Misload Analysis

The purpose of this calculation is to estimate the probability of misloading a commercial spent nuclear fuel waste package with a fuel assembly(s) that has a reactivity (i.e., enrichment and/or burnup) outside the waste package design. The waste package designs are based on the expected commercial spent nuclear fuel assemblies and previous analyses (Macheret, P. 2001, Section 4.1 and Table 1). For this calculation, a misloaded waste package is defined as a waste package that has a fuel assembly(s) loaded into it with an enrichment and/or burnup outside the waste package design. An example of this type of misload is a fuel assembly designated for the 21-PWR Control Rod waste package being incorrectly loaded into a 21-PWR Absorber Plate waste package. This constitutes a misloaded 21-PWR Absorber Plate waste package, because the reactivity (i.e., enrichment and/or burnup) of a 21-PWR Control Rod waste package fuel assembly is outside the design of a 21-PWR Absorber Plate waste package. These types of misloads (i.e., fuel assembly with enrichment and/or burnup outside waste package design) are the only types that are evaluated in this calculation. This calculation utilizes information from ''Frequency of SNF Misload for Uncanistered Fuel Waste Package'' (CRWMS M&O 1998) as …
Date: October 2, 2003
Creator: Knudson, J.K.
Object Type: Report
System: The UNT Digital Library
Contract Management: Restructuring GSA's Federal Supply Service and Federal Technology Service (open access)

Contract Management: Restructuring GSA's Federal Supply Service and Federal Technology Service

Testimony issued by the General Accounting Office with an abstract that begins "The General Services Administration's (GSA) Federal Supply Service (FSS) and Federal Technology Service (FTS) play an important role in assisting agencies procure a wide range of products and services. Over the past several years, FSS and FTS purchases have significantly increased, with IT products and services being the primary source of this growth. In April 2002, we identified overlap in FSS' and FTS' IT procurement programs. A management consultant similarly found overlaps in FTS' and FSS' IT sales and marketing functions and contract offerings. To enhance FSS and FTS operational efficiency and effectiveness--in both its IT and non-IT business lines--GSA has undertaken a performance improvement initiative. This testimony focuses on GSA's actions to implement its initiative. It also discusses the importance of enhancing GSA's ability to help agencies strategically purchase products and services."
Date: October 2, 2003
Creator: United States. General Accounting Office.
Object Type: Text
System: The UNT Digital Library
Cooper Review (Cooper, Tex.), Vol. 123, No. 40, Ed. 1 Thursday, October 2, 2003 (open access)

Cooper Review (Cooper, Tex.), Vol. 123, No. 40, Ed. 1 Thursday, October 2, 2003

Weekly newspaper from Cooper, Texas that includes local, state, and national news along with advertising.
Date: October 2, 2003
Creator: Pinson, Beth
Object Type: Newspaper
System: The Portal to Texas History
Drop Tests for the 6M Specification Package Closure Investigation (open access)

Drop Tests for the 6M Specification Package Closure Investigation

Results of tests of drum-type RAM packages employing conventional clamp-ring closures have caused concern within the DOE Complex over the Department of Transportation 6M Specification Package. To clarify these issues, the Savannah River Site's Radioactive Material Packaging Technology Group was commissioned to conduct a series of tests to determine the response of the clamp-ring closure to the regulatory Hypothetical Accident Condition drop tests, for packages at maximum allowable weight, 640 lb. Additionally, three enhanced closure designs were also tested: the Clamshell, plywood disk reinforcement, and J-Clip. The results of the tests showed that the standard closure was unable to retain its lid for both Center-of-Gravity-Over-Corner and Shallow-Angle cases, for the standard package, at its maximum allowed weight. Similar results were found for packages dropped from a reduced height. The Clamshell design provided the best performance of the enhanced closures.
Date: October 2, 2003
Creator: Smith, A. C.
Object Type: Report
System: The UNT Digital Library
The Dublin Citizen (Dublin, Tex.), Vol. 14, No. 5, Ed. 1 Thursday, October 2, 2003 (open access)

The Dublin Citizen (Dublin, Tex.), Vol. 14, No. 5, Ed. 1 Thursday, October 2, 2003

Weekly newspaper from Dublin, Texas that includes local, state, and national news along with advertising.
Date: October 2, 2003
Creator: unknown
Object Type: Newspaper
System: The Portal to Texas History
Electra Star-News (Electra, Tex.), Vol. 98, No. 6, Ed. 1 Thursday, October 2, 2003 (open access)

Electra Star-News (Electra, Tex.), Vol. 98, No. 6, Ed. 1 Thursday, October 2, 2003

Weekly newspaper from Electra, Texas that includes local, state, and national news along with advertising.
Date: October 2, 2003
Creator: unknown
Object Type: Newspaper
System: The Portal to Texas History

Ensemble: 2003-10-02 – Concert Band

Access: Use of this item is restricted to the UNT Community
Concert presented at the UNT College of Music Winspear Performance Hall.
Date: October 2, 2003
Creator: University of North Texas. Concert Band.
Object Type: Sound
System: The UNT Digital Library

Ensemble: 2003-10-02 – Symphonic Band

Access: Use of this item is restricted to the UNT Community
Concert presented at the UNT College of Music Winspear Performance Hall.
Date: October 2, 2003
Creator: University of North Texas. Symphonic Band.
Object Type: Sound
System: The UNT Digital Library
Evaluation of the Emission, Transport, and Deposition of Mercury, Fine Particulate Matter, and Arsenic From Coal-Based Power Plants in the Ohio River Valley Region Progress Report (open access)

Evaluation of the Emission, Transport, and Deposition of Mercury, Fine Particulate Matter, and Arsenic From Coal-Based Power Plants in the Ohio River Valley Region Progress Report

Ohio University, in collaboration with CONSOL Energy, Advanced Technology Systems, Inc (ATS) and Atmospheric and Environmental Research, Inc. (AER) as subcontractors, is evaluating the impact of emissions from coal-fired power plants in the Ohio River Valley region as they relate to the transport and deposition of mercury, arsenic, and associated fine particulate matter. This evaluation will involve two interrelated areas of effort: ambient air monitoring and regional-scale modeling analysis. The scope of work for the ambient air monitoring will include the deployment of a surface air monitoring (SAM) station in southeastern Ohio. The SAM station will contain sampling equipment to collect and measure mercury (including speciated forms of mercury and wet and dry deposited mercury), arsenic, particulate matter (PM) mass, PM composition, and gaseous criteria pollutants (CO, NO{sub x}, SO{sub 2}, O{sub 3}, etc.). Laboratory analysis of time-integrated samples will be used to obtain chemical speciation of ambient PM composition and mercury in precipitation. Near-real-time measurements will be used to measure the ambient concentrations of PM mass and all gaseous species including Hg{sup 0} and RGM. Approximately of 18 months of field data will be collected at the SAM site to validate the proposed regional model simulations for episodic and …
Date: October 2, 2003
Creator: Crist, Kevin
Object Type: Report
System: The UNT Digital Library
Excitations, optical absorption spectra, and optical excitonic gaps of heterofullerenes: I. C60, C59N+ and C48N12 (open access)

Excitations, optical absorption spectra, and optical excitonic gaps of heterofullerenes: I. C60, C59N+ and C48N12

Low-energy excitations and optical absorption spectrum of C{sub 60} are computed by using time-dependent (TD) Hartree-Fock (HF), TD-density functional theory (TD-DFT), TD-DFT-based tight-binding (TD-DFT-TB) and a semiempirical ZINDO method. A detailed comparison of experiment and theory for the excitation energies, optical gap and absorption spectrum of C{sub 60} is presented. It is found that electron correlations and collective effects of exciton pairs play important roles in assigning accurately the spectral features of C{sub 60} and the TD-DFT method with non-hybrid functionals or a local spin density approximation leads to more accurate excitation energies than with hybrid functionals. The level of agreement between theory and experiment for C{sub 60} justifies similar calculations of the excitations and optical absorption spectrum of a monomeric azafullerene cation C{sub 59}N{sup +} exhibits distinguishing spectral features different from C{sub 60}: (1) the first singlet is dipole-allowed and the optical gap is redshifted by 1.44 eV; (2) several weaker absorption maxima occur in the visible region; (3) the transient triplet-triplet absorption at 1.60 eV (775 nm) is much broader and the decay of the triplet state is much faster. The calculated spectra of C{sub 59}N{sup +} characterize and explain well our measured ultraviolet-visible (UV-vis) and transient absorption …
Date: October 2, 2003
Creator: Xie, Rui-Hua; Bryant, Garnett W.; Sun, Guangyu; Nicklaus, Mark C.; Heringer, David; Frauenheim, Th. et al.
Object Type: Article
System: The UNT Digital Library
The Express-Star (Chickasha, Okla.), Ed. 1 Thursday, October 2, 2003 (open access)

The Express-Star (Chickasha, Okla.), Ed. 1 Thursday, October 2, 2003

Daily newspaper from Chickasha, Oklahoma that includes local, state, and national news along with advertising.
Date: October 2, 2003
Creator: Bush, Kent
Object Type: Newspaper
System: The Gateway to Oklahoma History
The FBI: Past, Present, and Future (open access)

The FBI: Past, Present, and Future

This report contains information on the history of the FBI, the organization and culture of the FBI, current major investigative programs, pertinent relationships, and related information.
Date: October 2, 2003
Creator: Masse, Todd & Krouse, William
Object Type: Report
System: The UNT Digital Library
Federal Research and Development Funding: FY2004 (open access)

Federal Research and Development Funding: FY2004

None
Date: October 2, 2003
Creator: Davey, Michael E.
Object Type: Report
System: The UNT Digital Library
Field measurements in the Fermilab electron cooling solenoid prototype (open access)

Field measurements in the Fermilab electron cooling solenoid prototype

To increase the Tevatron luminosity, Fermilab is developing a high-energy electron cooling system [1] to cool 8.9-GeV/c antiprotons in the Recycler ring. The schematic layout of the Recycler Electron Cooling (REC) system is shown in Figure 1. Cooling of antiprotons requires a round electron beam with a small angular spread propagating through a cooling section with a kinetic energy of 4.3 MeV. To confine the electron beam tightly and to keep its transverse angles below 10{sup -4} rad, the cooling section will be immersed into a solenoidal field of 50-150G. As part of the R&D effort, a cooling section prototype consisting of 9 modules (90% of the total length of a future section) was assembled and measured. This paper describes the technique of measuring and adjusting the magnetic field quality in the cooling section and presents preliminary results of solenoid prototype field measurements. The design of the cooling section solenoid is discussed in Chapter 2. Chapter 3 describes details of a dedicated measurement system, capable of measuring small transverse field components, while the system's measurement errors are analyzed in Chapter 4. Chapter 5 contains measured field distributions of individual elements of the cooling section as well as an evaluation of …
Date: October 2, 2003
Creator: al., A. C. Crawford et
Object Type: Report
System: The UNT Digital Library
Fire And Dynamics Of Granivory On A California Grasslands Forb (open access)

Fire And Dynamics Of Granivory On A California Grasslands Forb

This study examines the effects of burning and granivory on the reproductive success of the rare plant Amsinckia grandiflora (Boraginaceae). Fire is often used in California grasslands as a means of exotic species control, but the indirect effects of these controls on the reproductive ecology of a native plants are rarely assessed. The interaction of fire with granivory of A. grandiflora seeds was examined in California grasslands over five years (1998-2002). In 1998 and 1999, both burned and unburned plots had bird-exclusion (netted) and no-exclusion (open) treatments. Predation rates were high (51-99%) and final predation rates did not differ among treatments. In 2000, granivory rates in the unburned, open plots were lower than in previous years (14%), and rodent trapping yielded only a single animal. Low granivory rates were observed in 2001 for unburned, open plots (47%). In 2001, burned/open plots experienced significantly more granivory (87%) than either burned/netted plots (37%) or unburned/open plots (47%). In 2002, every seed was taken from burned, open plots. Granivory was highly variable, ranging from 4% to 100% per plot over a three-week period. Nearly all plots were discovered (>10% predation) by granivores in all trials in all years. When data from all treatments …
Date: October 2, 2003
Creator: Espeland, E; Carlsen, T & Macqueen, D
Object Type: Article
System: The UNT Digital Library
Garber Billings News (Garber, Okla.), Vol. 103, No. 49, Ed. 1 Thursday, October 2, 2003 (open access)

Garber Billings News (Garber, Okla.), Vol. 103, No. 49, Ed. 1 Thursday, October 2, 2003

Weekly newspaper from Garber, Oklahoma that includes local, state, and national news along with advertising.
Date: October 2, 2003
Creator: Hogan, Vickie Lee
Object Type: Newspaper
System: The Gateway to Oklahoma History
A General Treatment of Solubility. 1. The QSPR Correlation of Solvation Free Energies of Single Solutes in Series of Solvents (open access)

A General Treatment of Solubility. 1. The QSPR Correlation of Solvation Free Energies of Single Solutes in Series of Solvents

Article on a general treatment of solubility and the quantitative structure-property relationship (QSPR) correlation of solvation free energies of single solutes in series of solvents.
Date: October 2, 2003
Creator: Katritzky, Alan R.; Oliferenko, Alexander A.; Oliferenko, Polina V.; Petrukhin, Ruslan; Tatham, Douglas B.; Maran, Uko, 1966- et al.
Object Type: Article
System: The UNT Digital Library
The Higher Education Act: Reauthorization Status and Issues (open access)

The Higher Education Act: Reauthorization Status and Issues

This report discusses the funding authorizations for programs in the Higher Education Act (HEA). This legislation, administered by the U.S. Department of Education (ED), authorizes the federal government’s major student aid programs, as well as other significant initiatives.
Date: October 2, 2003
Creator: Stedman, James B.
Object Type: Report
System: The UNT Digital Library