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385 Matching Results

Start Over Year 2002 Day 24th

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Results: 1 - 24 of 385 next

(open access)

Trade and the Americas

None

Date: May 24, 2002

Creator: Ahearn, Raymond J.

Object Type: Report

System: The UNT Digital Library

(open access)

U.S.-European Union Trade Relations: Issues and Policy Challenges

None

Date: October 24, 2002

Creator: Ahearn, Raymond J.

Object Type: Report

System: The UNT Digital Library

(open access)

Western Hemisphere Trade Developments

None

Date: June 24, 2002

Creator: Ahearn, Raymond J.

Object Type: Report

System: The UNT Digital Library

(open access)

Developing high brightness and high current beams for HIF injectors

The US Heavy Ion Fusion Virtual National Laboratory is continuing research into ion sources and injectors that simultaneously provide high current (0.5-1.0 Amps) and high brightness (normalized emittance better than 1.0 {pi}-mm-mr). The central issue of focus is whether to continue pursuing the traditional approach of large surface ionization sources or to adopt a multiaperture approach that transports many smaller ''beamlets'' separately at low energies before allowing them to merge. For the large surface source concept, the recent commissioning of the 2-MeV injector for the High Current eXperiment has increased our understanding of the beam quality limitations for these sources. We have also improved our techniques for fabricating large diameter aluminosilicate sources to improve lifetime and emission uniformity. For the multiaperture approach, we are continuing to study the feasibility of small surface sources and a RF induced plasma source in preparation for beamlet merging experiments, while continuing to run computer simulations for better understanding of this alternate concept. Experiments into both architectures will be performed on a newly commissioned ion source test stand at LLNL called STS-500. This stand test provides a platform for testing a variety of ion sources and accelerating structures with 500 kV, 17-microsecond pulses. Recent progress …

Date: May 24, 2002

Creator: Ahle, Larry; Grote, Dave & Kwan, Joe

Object Type: Article

System: The UNT Digital Library

(open access)

Scalable Analysis Techniques for Microprocessor Performance Counter Metrics

Contemporary microprocessors provide a rich set of integrated performance counters that allow application developers and system architects alike the opportunity to gather important information about workload behaviors. These counters can capture instruction, memory, and operating system behaviors. Current techniques for analyzing data produced from these counters use raw counts, ratios, and visualization techniques to help users make decisions about their application source code. While these techniques are appropriate for analyzing data from one process, they do not scale easily to new levels demanded by contemporary computing systems. Indeed, the amount of data generated by these experiments is on the order of tens of thousands of data points. Furthermore, if users execute multiple experiments, then we add yet another dimension to this already knotty picture. This flood of multidimensional data can swamp efforts to harvest important ideas from these valuable counters. Very simply, this paper addresses these concerns by evaluating several multivariate statistical techniques on these datasets. We find that several techniques, such as statistical clustering, can automatically extract important features from this data. These derived results can, in turn, be feed directly back to an application developer, or used as input to a more comprehensive performance analysis environment, such as …

Date: July 24, 2002

Creator: Ahn, D H & Vetter, J S

Object Type: Article

System: The UNT Digital Library

(open access)

Light-ion therapy in the U.S.: From the Bevalac to ??

While working with E.O. Lawrence at Berkeley, R.R. Wilson in 1946 noted the potential for using the Bragg-peak of protons (or heavier ions) for radiation therapy. Thus began the long history of contributions from Berkeley to this field. Pioneering work by C.A. Tobias et al at the 184-Inch Synchrocyclotron led ultimately to clinical applications of proton and helium beams, with over 1000 patients treated through 1974 with high-energy plateau radiation; placing the treatment volume (mostly pituitary fields) at the rotational center of a sophisticated patient positioner. In 1974 the SuperHILAC and Bevatron accelerators at the Lawrence Berkeley Laboratory were joined by the construction of a 250-meter transfer line, forming the Bevalac, a facility capable of accelerating ions of any atomic species to relativistic energies. With the advent of these new beams, and better diagnostic tools capable of more precise definition of tumor volume and determination of the stopping point of charged-particle beams, large-field Bragg-peak therapy with ion beams became a real possibility. A dedicated Biomedical experimental area was developed, ultimately consisting of three distinct irradiation stations; two dedicated to therapy and one to radiobiology and biophysics. These facilities included dedicated support areas for patient setup and staging of animal and …

Date: September 24, 2002

Creator: Alonso, Jose R. & Castro, Joseph R.

Object Type: Article

System: The UNT Digital Library

(open access)

How well do we know the electromagnetic form factors of the proton?

Recent measurements of recoil polarization in elastic scattering have been used to extract the ratio of the electric to the magnetic proton form factors. These results disagree with Rosenbluth extractions from cross section measurements, indicating either an inconsistency between the two techniques, or a problem with either the polarization transfer or cross section measurements. To obtain precise knowledge of the proton form factors, they must first understand the source of this discrepancy.

Date: September 24, 2002

Creator: Arrington, J.

Object Type: Article

System: The UNT Digital Library

(open access)

League of Women Voters: Water Pollution Survey

None

Date: January 24, 2002

Creator: Aspen Market Research

Object Type: Text

System: The UNT Digital Library

(open access)

Federal Disaster Policies After Terrorists Strike: Issues and Options for Congress

This report is intended to assist Congress as it considers options for consequence management legislation. It provides information on federal policies that would be implemented in the event that terrorist attacks in an attempt to answer the question: Based on experiences gained thus far, should Congress consider changes in federal consequence management policies to address the effects of possible future attacks? The report explores two types of issues--selected administrative issues pertinent to the delivery of assistance, and selected policy issues about the assistance provided.

Date: June 24, 2002

Creator: Bea, Keith

Object Type: Report

System: The UNT Digital Library

(open access)

Coupled-Oscillator Model for Nonlinear Optical Activity

Describes linear optical activity which studies non linear optical activity of dimer-like chiral molecules.

Date: April 24, 2002

Creator: Belkin, M. A.; Shen, Y. R. & Flytzanis, C.

Object Type: Article

System: The UNT Digital Library

(open access)

SMALL, GEOLOGICALLY COMPLEX RESERVOIRS CAN BENEFIT FROM RESERVOIR SIMULATION

The Cascade Sand zone of the Mission-Visco Lease in the Cascade Oil field of Los Angeles County, California, has been under water flood since 1970. Increasing water injection to increase oil production rates was being considered as an opportunity to improve oil recovery. However, a secondary gas cap had formed in the up-dip portion of the reservoir with very low gas cap pressures, creating concern that oil could be displaced into the gas cap resulting in the loss of recoverable oil. Therefore, injecting gas into the gas cap to keep the gas cap pressurized and restrict the influx of oil during water injection was also being considered. Further, it was recognized that the reservoir geology in the gas cap area is very complex with numerous folding and faulting and thus there are potential pressure barriers in several locations throughout the reservoir. With these conditions in mind, there were concerns regarding well to well continuity in the gas cap, which could interfere with the intended repressurization impact. Concerns about the pattern of gas flow from well to well, the possibilities of cycling gas without the desired increased pressure, and the possible loss of oil displaced into the gas cap resulted in …

Date: June 24, 2002

Creator: Bennett, Richard E.

Object Type: Report

System: The UNT Digital Library

(open access)

Military Medical Care Services: Questions and Answers

None

Date: June 24, 2002

Creator: Best, Richard A., Jr.

Object Type: Report

System: The UNT Digital Library

(open access)

Local Atomic Structure of Semiconductor Alloys Using Pair Distribution Function Analysis

We have been taking advantage of recent experimental developments, which involve utilizing diffraction data from x-rays or neutrons out to very large wave-vectors, to obtain a detailed structural characterization of semiconductor alloys. This approach allows an accurate Pair Distribution Function (PDF) to be obtained to 20A and beyond and reveals the local structure of the alloy directly. These data can be modeled explicitly to learn about local correlations and short-range order in materials. We are combining theory, modeling and experiments to study a range of materials from semiconductors to thermoelectrics and proton conductors.

Date: June 24, 2002

Creator: Billinge, S.J.L. & Thorpe, M.F.

Object Type: Report

System: The UNT Digital Library

(open access)

Research and Development for X-Ray Optics and Diagnostics on the Linac Coherent Source (LCLS)

The Linac Coherent Light Source (LCLS) is a 1.5 to 15 {angstrom} wavelength Free-Electron Laser (PEL), under development at the Stanford Linear Accelerator Center (SLAC). The photon output consists of high brightness, transversely coherent pulses with duration < 300 fs, together with a broad spontaneous spectrum. The output energy density per unit area, pulse duration, repetition rate, and small FEL spot size pose special challenges for optical components and diagnostics downstream of the undulator. Planning for the photon beam transport, manipulation and diagnostics downstream of the undulator has begun.

Date: September 24, 2002

Creator: Bionta, R. M.; Arthur, J.; Chapman, H.; Craig, B.; Klingmann, J.; Kuba, J. et al.

Object Type: Article

System: The UNT Digital Library

(open access)

Completion of an Undulator-Based X-ray Scattering Facility for Materials Research on Complex Fluids

A synchrotron radiation-based X-ray scattering facility for materials research on complex fluids has been completed on Sector 09 at the Advanced Photon Source at Argonne National Laboratory. It consists of a beamline on an undulator magnet source with doubly focusing X-ray optics and endstation spectrometers for both small angle X-ray scattering and liquid surface X-ray scattering.

Date: April 24, 2002

Creator: Blasie, J. Kent

Object Type: Report

System: The UNT Digital Library

(open access)

NOx Control Options and Integration for US Coal Fired Boilers Quarterly Progress Report: July-September 2002

This is the ninth Quarterly Technical Report for DOE Cooperative Agreement No: DE-FC26-00NT40753. The goal of the project is to develop cost effective analysis tools and techniques for demonstrating and evaluating low NOx control strategies and their possible impact on boiler performance for firing US coals. The Electric Power Research Institute (EPRI) is providing cofunding for this program. This program contains multiple tasks and good progress is being made on all fronts. Various subsystems of BYU's Catalyst Characterization System (CCS) were upgraded this quarter. Work on the CCS hardware and software will continue in the coming quarter. A preliminary test matrix of poisoning experiments in the CCS has been drafted that will explore the effects of at least three poisons: sodium, potassium and calcium. During this quarter, we attempted to resolve discrepancies in previous in situ measurements of catalyst sulfation. Modifications were made to the XPS analysis procedure that allowed analyses of uncrushed samples. Although the XPS and FTIR results are now more consistent in that both indicate that the surface is sulfating (unlike the results reported last quarter), they disagree with respect to which species sulfates. The CEM system for the multi-catalyst slipstream reactor arrived this quarter. Minor modifications …

Date: October 24, 2002

Creator: Bockelie, Mike; Cremer, Marc; Davis, Kevin; Senior, Connie; Hurt, Bob; Eddings, Eric et al.

Object Type: Report

System: The UNT Digital Library

(open access)

Chemical Weapons Convention: Issues for Congress

The Convention provides the most extensive and intrusive verification regime of any arms control treaty, extending its coverage to not only governmental but also civilian facilities. The Convention also requires export controls and reporting requirements on chemicals that can be used as warfare agents and their precursors. The CWC establishes the Organization for the Prohibition of Chemical Weapons (OPCW) to oversee the Convention's implementation. Chemical Weapons Convention implementing legislation, as S. 610, passed the Senate unanimously on May 23, 1997. This legislation, which was an amendment in the nature of a substitute reported from the Judiciary Committee, provides the statutory authority for domestic compliance with the Convention's provisions. It sets criminal and civil penalties for the development, production, acquisition, stockpiling, transfer, possession, or use of chemical weapons.

Date: June 24, 2002

Creator: Bowman, Steven R.

Object Type: Report

System: The UNT Digital Library

(open access)

Fruits and Vegetables: Issues for Congress

This report discusses the issues for Congress related to fruits & vegetables. The contents include federal activities, programs, farm bill issues, & trade issues.

Date: October 24, 2002

Creator: Branaman, Brenda

Object Type: Report

System: The UNT Digital Library