States

Language

Strange Goings on in Quark Matter. (open access)

Strange Goings on in Quark Matter.

We review recent work on how the superfluid state of three flavor quark matter is affected by non-zero quark masses and chemical potentials. The study of hadronic matter at high baryon density has recently attracted a lot of interest. At zero baryon density chiral symmetry is broken by a quark-anti-quark condensate. At high density condensation in the quark-anti-quark channel is suppressed. Instead, attractive interactions in the color anti-symmetric quark-quark channel favor the formation of diquark condensates. As a consequence, cold dense quark matter is expected to be a color superconductor. The symmetry breaking pattern depends on the density, the number of quark flavors, and their masses. A particularly symmetric phase is the color-flavor-locked (CFL) phase of three flavor quark matter. This phase is believed to be the true ground state of ordinary matter at very large density.
Date: June 5, 2001
Creator: Schafer, T.
Object Type: Article
System: The UNT Digital Library
CSEWG SYMPOSIUM, A CSWEG RETROSPECTIVE. 35TH ANNIVERSARY CROSS SECTION EVALUATION WORKING GROUP, NOV. 5, 2001, BROOKHAVEN NATIONAL LABORATORY. (open access)

CSEWG SYMPOSIUM, A CSWEG RETROSPECTIVE. 35TH ANNIVERSARY CROSS SECTION EVALUATION WORKING GROUP, NOV. 5, 2001, BROOKHAVEN NATIONAL LABORATORY.

This publication has been prepared to record some of the history of the Cross Section Evaluation Working Group (CSEWG). CSEWG is responsible for creating the evaluated nuclear data file (ENDF/B) which is widely used by scientists and engineers who are involved in the development and maintenance of applied nuclear technologies. This organization has become the model for the development of nuclear data libraries throughout the world. The data format (ENDF) has been adopted as the international standard. On November 5, 2001, a symposium was held at Brookhaven National Laboratory to celebrate the 50 th meeting of the CSEWG organization and the 35 th anniversary of its first meeting in November 1966. The papers presented in this volume were prepared by present and former CSEWG members for presentation at the November 2001 symposium. All but two of the presentations are included. I have included an appendix to list all of the CSEWG members and their affiliations, which has been compiled from the minutes of each of the CSEWG meetings. Minutes exist for all meetings except the 4 th meeting held in January 1968. The list includes 348 individuals from 71 organizations. The dates for each of the 50 CSEWG meetings are …
Date: November 5, 2001
Creator: DUNFORD, C.; HOLDEN, N. & PEARLSTEIN, S.
Object Type: Report
System: The UNT Digital Library
Texas Register, Volume 26, Number 1, Pages 1-266, January 5, 2001 (open access)

Texas Register, Volume 26, Number 1, Pages 1-266, January 5, 2001

A weekly publication, the Texas Register serves as the journal of state agency rulemaking for Texas. Information published in the Texas Register includes proposed, adopted, withdrawn and emergency rule actions, notices of state agency review of agency rules, governor's appointments, attorney general opinions, and miscellaneous documents such as requests for proposals. After adoption, these rulemaking actions are codified into the Texas Administrative Code.
Date: January 5, 2001
Creator: Texas. Secretary of State.
Object Type: Journal/Magazine/Newsletter
System: The Portal to Texas History
Texas Register, Volume 26, Number 40, Pages 7663-7948, October 5, 2001 (open access)

Texas Register, Volume 26, Number 40, Pages 7663-7948, October 5, 2001

A weekly publication, the Texas Register serves as the journal of state agency rulemaking for Texas. Information published in the Texas Register includes proposed, adopted, withdrawn and emergency rule actions, notices of state agency review of agency rules, governor's appointments, attorney general opinions, and miscellaneous documents such as requests for proposals. After adoption, these rulemaking actions are codified into the Texas Administrative Code.
Date: October 5, 2001
Creator: Texas. Secretary of State.
Object Type: Journal/Magazine/Newsletter
System: The Portal to Texas History
Defense Budget: Need to Better Inform Congress on Funding for Army Division Training (open access)

Defense Budget: Need to Better Inform Congress on Funding for Army Division Training

A letter report issued by the General Accounting Office with an abstract that begins "Congress has expressed concern about the extent to which the Department of Defense has moved funds that directly affect military readiness, such as those that finance training, to pay for other subactivities within its operation and maintenance (O&M) account, such as real property maintenance and base operations. This report reviews the (1) Army's obligation of O&M division training funds and (2) readiness of the Army's divisions. GAO found that the Army continued to use division training funds for purposes other than training during fiscal year 2000. However, the reduced funding did not interfere with the Army's planned training events or exercises. The Army's tank units also reported that, despite the reduced funding and their failure to meet their tank mileage performance goal, their readiness remained high. Specifically, many tank units reported that they could be fully trained for their wartime mission within a short time period. Units that reported that they would need more time to become fully trained generally cited personnel issues rather than the lack of training funds as the reason. Even so, starting in fiscal year 2001, the Army has taken action to …
Date: July 5, 2001
Creator: United States. General Accounting Office.
Object Type: Report
System: The UNT Digital Library
Dairy Products: Imports, Domestic Production, and Regulation of Ultra-filtered Milk (open access)

Dairy Products: Imports, Domestic Production, and Regulation of Ultra-filtered Milk

A letter report issued by the General Accounting Office with an abstract that begins "The ultra-filtration process for milk, developed in the 1970s, removes most of the fluid components, leaving a high concentration of milk protein that allows cheese and other manufacturers to produce their products more efficiently. No specific data on amount of ultra-filtered milk imports exists because these imports fall under the broader U.S. Customs Service classification of milk protein concentrate. Exporters of milk protein concentrates face minimal U.S. import restrictions, and the Food and Drug Administration (FDA) believes the milk protein concentrates pose minimal safety risks. Similarly, there is little data on the amount and use of domestically produced ultra-filtered milk in U.S. cheese making plants. According to the Department of Agriculture and state sources, a total of 22 dairy plants nationwide and five large dairy farms in New Mexico and Texas produce ultra-filtered milk. The plants primarily produce and use ultra-filtered milk in the process of making cheese. The five farms transport their product primarily to cheese-making plants in the Midwest, where most is used to make standardized cheeses. FDA relies on its own inspections, and those it contracts with 37 states, to enforce its standards …
Date: March 5, 2001
Creator: United States. General Accounting Office.
Object Type: Report
System: The UNT Digital Library
Comments on Obligations Incurred by TRICARE Management Activity (open access)

Comments on Obligations Incurred by TRICARE Management Activity

Other written product issued by the General Accounting Office with an abstract that begins "This report provides information on the legal requirements for recognizing and recording obligations under the Defense Health Program (DHP), specifically focusing on (1) the legal basis for obligations incurred by TRICARE Management Activity for, among other services, medical services provided directly by the Department of Defense (DOD) to beneficiaries as well as medical services provided by civilian contractors who subsequently bill DHP for those services, (2) the legal basis for obligations for costs of change orders or other negotiated settlements, and (3) whether the Antideficiency Act applies to DHP obligations and expenditures. GAO held that (1) DOD 's practices in obligating funds are consistent with federal regulations, (2) DOD should record obligations for change orders against the appropriation current at the time the services are rendered, and (3) DOD may enter into obligations in excess of available resources, but it must obtain appropriations sufficient to liquidate those obligations."
Date: July 5, 2001
Creator: United States. General Accounting Office.
Object Type: Text
System: The UNT Digital Library
Interconnecting Single-Phase Generation to the Utility Distribution System (open access)

Interconnecting Single-Phase Generation to the Utility Distribution System

One potentially large source of underutilized distributed generation (DG) capacity exists in single-phase standby backup gensets on farms served from single-phase feeder laterals. Utilizing the excess capacity would require interconnecting to the utility system. Connecting single-phase gensets to the utility system presents some interesting technical issues that have not been previously investigated. This paper addresses several of the interconnection issues associated with this form of DG including voltage regulation, harmonics, overcurrent protection, and islanding. A significant amount of single-phase DG can be accommodated by the utility distribution system, but there are definite limitations due to the nature and location of the DG. These limitations may be more restrictive than is commonly assumed for three-phase DG installed on stronger parts of the electric distribution system.
Date: December 5, 2001
Creator: Dugan, Roger C.
Object Type: Report
System: The UNT Digital Library
Melt-processing high-T{sub c} superconductors under an elevated magnetic field [Final report no. 2] (open access)

Melt-processing high-T{sub c} superconductors under an elevated magnetic field [Final report no. 2]

This report presents models for crystallographic texture development for high temperature superconducting oxides processed in the absence of a magnetic field and in the presence of a high magnetic field. The results of the models are confirmed through critical experiments. Processing thick films and tapes of high temperature superconducting oxides under a high magnetic field (5-10T) improves the critical current density exhibited.
Date: September 5, 2001
Creator: Sande, John B. Vander
Object Type: Report
System: The UNT Digital Library
Development of simulation tools for virus shell assembly. Final report (open access)

Development of simulation tools for virus shell assembly. Final report

Prof. Berger's major areas of research have been in applying computational and mathematical techniques to problems in biology, and more specifically to problems in protein folding and genomics. Significant progress has been made in the following areas relating to virus shell assembly: development has been progressing on a second-generation self-assembly simulator which provides a more versatile and physically realistic model of assembly; simulations are being developed and applied to a variety of problems in virus assembly; and collaborative efforts have continued with experimental biologists to verify and inspire the local rules theory and the simulator. The group has also worked on applications of the techniques developed here to other self-assembling structures in the material and biological sciences. Some of this work has been conducted in conjunction with Dr. Sorin Istrail when he was at Sandia National Labs.
Date: January 5, 2001
Creator: Berger, Bonnie
Object Type: Report
System: The UNT Digital Library
Chirped-Pulse Inverse Free Electron Laser: A Tabletop, High-Gradient Vacuum Laser Accelerator (open access)

Chirped-Pulse Inverse Free Electron Laser: A Tabletop, High-Gradient Vacuum Laser Accelerator

The inverse free-electron laser (IFEL) interaction is studied both theoretically and numerically in the case where the drive laser intensity approaches the relativistic regime, and the pulse duration is only a few optical cycles long. We show that by using an ultrashort, ultrahigh-intensity drive laser pulse, the IFEL interaction bandwidth and accelerating gradient are increased considerably, thus yielding large energy gains. Using a chirped pulse and negative dispersion focusing optics allows one to take further advantage of the laser optical bandwidth and produce a chromatic line focus maximizing the gradient. The combination of these novel ideas results in a compact vacuum laser accelerator capable of accelerating picosecond electron bunches with a high gradient (GeV/m) and very low energy spread. A computer code which takes into account the three-dimensional nature of the interaction is currently in development and results are expected this Spring.
Date: March 5, 2001
Creator: Hartemann, F. V.; Troha, A. L. & Baldis, H. A.
Object Type: Report
System: The UNT Digital Library
Analysis of Geomechanical Behavior for the Drift Scale Test (open access)

Analysis of Geomechanical Behavior for the Drift Scale Test

The Drift Scale Test (DST) now underway at Yucca Mountain has been simulated using a Drift Scale Distinct Element (DSDE) model. Simulated deformations show good agreement with field deformation measurements. Results indicate most fracture deformation is located above the crown of the Heated Drift. This work is part of the model validation effort for the DSDE model, which is used to assess thermal-mechanical effects on the hydrology of the rock mass surrounding a potential repository.
Date: March 5, 2001
Creator: Blair, S. C.; Carlson, S. R. & Wagoner, J. L.
Object Type: Article
System: The UNT Digital Library
Photothermal Properties of Shape Memory Polymer Micro-Actuators for Treating Stroke (open access)

Photothermal Properties of Shape Memory Polymer Micro-Actuators for Treating Stroke

Objective--In this paper the photothermal design aspects of novel shape memory polymer (SMP) microactuators for treating stroke are presented. Materials and Methods--A total of three devices will be presented: two interventional ischemic stroke devices (coil and umbrella) and one device for releasing embolic coils (microgripper). The optical properties of SMP, methods for coupling laser light into SMP, heating distributions in the SMP devices and the impact of operating the thermally activated material in a blood vessel are presented. Results--Actuating the devices requires device temperatures in the range of 65 C-85 C. Attaining these temperatures under flow conditions requires critical engineering of the SMP optical properties, optical coupling into the SMP, and device geometries. Conclusion--Laser-activated SMP devices are a unique combination of laser-tissue and biomaterial technologies. Successful deployment of the microactuator requires well-engineered coupling of the light from the diffusing fiber through the blood into the SMP.
Date: March 5, 2001
Creator: Maitland, D J; Metzger, M F; Schumann, D; Lee, A & Wilson, T S
Object Type: Article
System: The UNT Digital Library
Campaign Finance Bills in the 107th Congress: Comparison of S. 27 (McCain-Feingold), H.R. 2356 (Shays-Meehan), H.R. 2360 (Ney-Wynn), and Current Law (open access)

Campaign Finance Bills in the 107th Congress: Comparison of S. 27 (McCain-Feingold), H.R. 2356 (Shays-Meehan), H.R. 2360 (Ney-Wynn), and Current Law

This report summarizes and compares three major campaign finance reform bills before the 107th Congress and current law (in most cases, the Federal Election Campaign Act, or FECA, 2 U.S.C. § 431 et seq.).
Date: July 5, 2001
Creator: Cantor, Joseph E. & Whitaker, L. Paige
Object Type: Report
System: The UNT Digital Library
Focus on NIF September 2001 (open access)

Focus on NIF September 2001

As of the end of August, the National Ignition Facility (NIF) is satisfactorily meeting its technical performance, cost and schedule milestones. Hensel Phelps Construction Company (HPCC) turned over the Laser Building to the Beampath Infrastructure System (BIS) Commissioning and Operations team for beneficial occupancy.
Date: September 5, 2001
Creator: Warner, B
Object Type: Thesis or Dissertation
System: The UNT Digital Library
X-Ray Dose and Spot Size Calculations for the DARHT-II Distributed Target (open access)

X-Ray Dose and Spot Size Calculations for the DARHT-II Distributed Target

The baseline DARHT-II converter target consists of foamed tantalum within a solid-density cylindrical tamper. The baseline design has been modified by D. Ho to further optimize the integrated line density of material in the course of multiple beam pulses. LASNEX simulations of the hydrodynamic expansion of the target have been performed by D. Ho (documented elsewhere). The resulting density profiles have been used as inputs in the MCNP radiation transport code to calculate the X-ray dose and spot size assuming a incoming Gaussian electron beam with {sigma} = 0.65mm, and a PIC-generated beam taking into account the ''swept'' spot emerging from the DARHT-II kicker system. A prerequisite to these calculations is the absorption spectrum of air. In order to obtain this, a separate series of MCNP runs was performed for a set of monoenergetic photon sources, tallying the energy deposited in a volume of air. The forced collision feature was used to improve the statistics since the photon mean free path in air is extremely long at the energies of interest. A sample input file is given below. The resulting data for the MCNP DE and DF cards is shown in the beam-pulse input files, one of which is listed …
Date: April 5, 2001
Creator: McCarrick, J
Object Type: Report
System: The UNT Digital Library
Nanosecond frame cameras (open access)

Nanosecond frame cameras

The advent of CCD cameras and computerized data recording has spurred the development of several new cameras and techniques for recording nanosecond images. We have made a side by side comparison of three nanosecond frame cameras, examining them for both performance and operational characteristics. The cameras include; Micro-Channel Plate/CCD, Image Diode/CCD and Image Diode/Film; combinations of gating/data recording. The advantages and disadvantages of each device will be discussed.
Date: January 5, 2001
Creator: Frank, A M & Wilkins, P R
Object Type: Article
System: The UNT Digital Library
Functional Categories of the Federal Budget (open access)

Functional Categories of the Federal Budget

This report lists the different functional and subfunctional categories that represents the major purposes of the federal government.
Date: March 5, 2001
Creator: Heniff, Bill, Jr.
Object Type: Report
System: The UNT Digital Library
Credit Union Membership Access Act: Background and Issues (open access)

Credit Union Membership Access Act: Background and Issues

This report provides an overview of the Credit Union Membership Access Act. The Act provides for future multiple-group formations subject to limitations that the NCUA must consider when authorizing charters.
Date: January 5, 2001
Creator: Smale, Pauline H.
Object Type: Report
System: The UNT Digital Library
Horizontal Path Laser Communications Employing MEMS Adaptive Optics Correction (open access)

Horizontal Path Laser Communications Employing MEMS Adaptive Optics Correction

Horizontal path laser communications are beginning to provide attractive alternatives for high-speed optical communications, In particular, companies are beginning to sell fiberless alternatives for intranet and sporting event video. These applications are primarily aimed at short distance applications (on the order of 1 km pathlength). There exists a potential need to extend this pathlength to distances much greater than a 1km. For cases of long distance optical propagation, atmospheric turbulence will ultimately limit the maximum achievable data rate. In this paper, we propose a method of improved signal quality through the use of adaptive optics. In particular, we show work in progress toward a high-speed, small footprint Adaptive Optics system for horizontal path laser communications. Such a system relies heavily on recent progress in Micro-Electro-Mechanical Systems (MEMS) deformable mirrors as well as improved communication and computational components. In this paper we detail two Adaptive Optics approaches for improved through-put, the first is the compensated receiver (the traditional Adaptive Optics approach), the second is the compensated transmitter/receiver. The second approach allows for correction of the optical wavefront before transmission from the transmitter and prior to detection at the receiver.
Date: September 5, 2001
Creator: Thompson, C. A.; Wilks, S. C.; Brase, J. M.; Young, R. A.; Johnson, G. W. & Ruggiero, A. J.
Object Type: Article
System: The UNT Digital Library
Pressure drop in D0 Run2B stave (open access)

Pressure drop in D0 Run2B stave

The D0 Run2b stave structure has been tested to determine the pressure drop along the cooling line and suggest a possible cooling pipe size. The measured pressure drop, charted versus the flow rate, shows good agreement with what is theoretically predicted, the latter underestimating the experimental data in the worst case with a 5.5% error. At a fixed flow rate of 175-ml/min and bulk temperature of -15 C, a cooling pipe formed from a 0.158 inch (4.0mm) ID tube would meet the 3.0 psi target pressure drop. With the same piping and a bulk temperature of -10 C the pressure drop is around 2.3 psi.
Date: December 5, 2001
Creator: Lanfranco, Giobatta
Object Type: Report
System: The UNT Digital Library
Manganin Gauge and Reactive Flow Modeling Study of the Shock Initiation of PBX 9501 (open access)

Manganin Gauge and Reactive Flow Modeling Study of the Shock Initiation of PBX 9501

A series of 101mm diameter gas gun experiments was fired using manganin pressure gauges embedded in the HMX-based explosive PBX 9501 at initial temperatures of 20 C and 50 C. Flyer plate impact velocities were chosen to produce impact pressure levels in PBX 9501 at which the growth of explosive reaction preceding detonation was measured on most of the gauges and detonation pressure profiles were recorded on some of the gauges placed deepest into the explosive targets. All measured pressure histories for initial temperatures of 25 C and 50 C were essentially identical. Measured run distances to detonation at several input shock pressures agreed with previous results. An existing ignition and growth reactive flow computer model for shock initiation and detonation of PBX 9501, which was developed based on LANL embedded particle velocity gauge data, was tested on these pressure gauge results. The agreement was excellent, indicating that the embedded pressure and particle velocity gauge techniques yielded consistent results.
Date: June 5, 2001
Creator: Tarver, C M; Forbes, J W; Garcia, F & Urtiew, P A
Object Type: Article
System: The UNT Digital Library
Image-driven mesh optimization (open access)

Image-driven mesh optimization

We describe a method of improving the appearance of a low vertex count mesh in a manner that is guided by rendered images of the original, detailed mesh. This approach is motivated by the fact that greedy simplification methods often yield meshes that are poorer than what can be represented with a given number of vertices. Our approach relies on edge swaps and vertex teleports to alter the mesh connectivity, and uses the downhill simplex method to simultaneously improve vertex positions and surface attributes. Note that this is not a simplification method--the vertex count remains the same throughout the optimization. At all stages of the optimization the changes are guided by a metric that measures the differences between rendered versions of the original model and the low vertex count mesh. This method creates meshes that are geometrically faithful to the original model. Moreover, the method takes into account more subtle aspects of a model such as surface shading or whether cracks are visible between two interpenetrating parts of the model.
Date: January 5, 2001
Creator: Lindstrom, P & Turk, G
Object Type: Article
System: The UNT Digital Library
Consideration of the Budget Resolution (open access)

Consideration of the Budget Resolution

This report provides information about the Consideration of the Budget Resolution.
Date: March 5, 2001
Creator: Heniff, Bill, Jr.
Object Type: Report
System: The UNT Digital Library