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Nucleus-nucleus collisions at very high energies

Description: The present report covers the material of two lectures. The first part, contains a collection of useful formulae from relativistic kinematics and deals with invariant cross sections and multiplicities. The remainder of the paper is on strangeness production in relativistic heavy ion collisions. Some elementary rules for particle production in nucleon-nucleon interactions are presented. This paper also contains arguments on why one expects enhanced strange particle production from the quark-gluo… more
Date: January 1, 1990
Creator: Hansen, O.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Strangeness enhancement in 14. 6 A GeV/c Si+Au interactions

Description: The questions of strangeness enhancement and of J/{psi} suppression have become central in the discussion of high energy heavy ion physics. Both phenomena have been predicted as signs of the formation of a deconfined quark-gluon phase of matter, both have been observed and both may be explainable also in terms of ordinary hadronic matter. In this note the question of K{sup +} and K{sup {minus}} enhancement will be discussed from a much less elevated point of view, namely as a question of enhanc… more
Date: January 1, 1990
Creator: Hansen, O.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Environmental Compliance for Oil and Gas Exploration and Production

Description: The Appalachian/Illinois Basin Directors is a group devoted to increasing communication among the state oil and gas regulatory agencies within the Appalachian and Illinois Basin producing region. The group is comprised of representatives from the oil and gas regulatory agencies from states in the basin (Attachment A). The directors met to discuss regulatory issues common to the area, organize workshops and seminars to meet the training needs of agencies dealing with the uniqueness of their prod… more
Date: October 26, 1999
Creator: Hansen, Christine
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department

[Photograph of five men and cat]

Description: A photograph of Bruce Monroe (holding cat) as he moves to Washington D.C. to take a position with the National Holocaust Museum. From left to right: Rick Garlington, Rick Wunche, Bruce Monroe, Ken Flanagan, Craig Spaulding. Photograph taken by Andy Hansen.
Date: 1991
Creator: Hansen, Andy
Item Type: Refine your search to only Photograph
Partner: UNT Libraries Special Collections
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Frame work on an on-line regulations expert permit server, Semi-annual technical progress report, September 25, 1996--March 24, 1997

Description: The Interstate Oil and Gas Compact Commission and its member states have become increasingly concerned about environmental compliance costs for the petroleum exploration and production industry with estimated costs for 1990 at about $2 billion. Over the last decade, these costs have increased at a rate of 3 to 5% per year. At a time when regulatory and environmental needs and costs are increasing, major oil companies are restructuring and reducing staffs. The places an increased burden on the r… more
Date: March 24, 1997
Creator: Hansen, C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Framework on an On-Line Regulations Expert Permit Server

Description: This is a cooperative project between the Oil and Gas Compact Commission (OIGCC) and the oil and gas industry to use computerized communication technology as a means of providing information from state agencies. A major effort is the development of a framework for an on-line regulatory compliance and permit server system. Other aspects included provide feedback to state regulatory agencies with recommendations suggesting where procedures or regulations could be simplified or streamlined, identi… more
Date: December 31, 1997
Creator: Hansen, Christine
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Neutron scattering analysis with microscopic optical model potentials

Description: A review of microscopic optical model potentials used in the analysis of neutron scattering and analyzing power data below 100 MeV (5 {le}E{sub n}{le}100 MeV) is presented. The quality of the fits to the data over a wide massd ({sup 6}Li-{sup 239}Pu) and energy range is discussed. It is shown that reasonably good agreement with the data is obtained with only three parameters, {lambda}{sub V}, {lambda}{sub W}, and {lambda}{sub SO}, which show a smooth mass and energy dependence. These parameters… more
Date: September 3, 1991
Creator: Hansen, L. F.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

The hardware accelerator array for logic simulation

Description: Hardware acceleration exploits the parallelism inherent in large circuit simulations to achieve significant increases in performance. Simulation accelerators have been developed based on the compiled code algorithm or the event-driven algorithm. The greater flexibility of the event-driven algorithm has resulted in several important developments in hardware acceleration architecture. Some popular commercial products have been developed based on the event-driven algorithm and data-flow architectu… more
Date: May 1, 1991
Creator: Hansen, N H
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Yaw dynamics of horizontal axis wind turbines. Final report

Description: Designers of a horizontal axis wind turbine yaw mechanism are faced with a difficult decision. They know that if they elect to use a yaw- controlled rotor then the system will suffer increased initial cost and increased inherent maintenance and reliability problems. On the other hand, if they elect to allow the rotor to freely yaw they known they will have to account for unknown and random, though bounded, yaw rates. They will have a higher-risk design to trade-off against the potential for cos… more
Date: May 1, 1992
Creator: Hansen, A. C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Evaluation of midband analog fiber optic telemetry links

Description: Midband (1KHz -- 500MHz) analog fiber optic data links were purchased for evaluation from three suppliers. Ortel Corp., Alhambra, CA, provided units built to the specifications. Kaman Sciences Corp, Colorado Springs, CO and Laser Diode Inc., Princeton, NJ, provided units similar to the specification but with significant differences. The final version of the Ortel units met the specification but were marginal in dynamic range. The other units failed to meet the specification but showed promise f… more
Date: May 1, 1993
Creator: Hansen, G. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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A comparison of the shielding performances of the AT-400A, Model FL and Model AL-R8 containers

Description: A comparison of the neutron and photon dose rates at different locations on the outside surface of the Model AL-RB, Model FL and the AT-400A containers for a given pit load has been done in order to understand the shielding characteristics of these containers. The Model AL-R8 is not certified for transport and is only used for storage of pits, while the Model FL is a certified Type B pit transportation container. The AT-400A is being developed as a type B pit storage and transportation containe… more
Date: April 28, 1995
Creator: Hansen, L. F.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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The use of sequential indicator simulation to characterize geostatistical uncertainty; Yucca Mountain Site Characterization Project

Description: Sequential indicator simulation (SIS) is a geostatistical technique designed to aid in the characterization of uncertainty about the structure or behavior of natural systems. This report discusses a simulation experiment designed to study the quality of uncertainty bounds generated using SIS. The results indicate that, while SIS may produce reasonable uncertainty bounds in many situations, factors like the number and location of available sample data, the quality of variogram models produced by… more
Date: October 1, 1992
Creator: Hansen, K.M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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National Environmental Policy Act (NEPA) Compliance Guide, Sandia National Laboratories

Description: This report contains a comprehensive National Environmental Policy Act (NEPA) Compliance Guide for the Sandia National Laboratories. It is based on the Council on Environmental Quality (CEQ) NEPA regulations in 40 CFR Parts 1500 through 1508; the US Department of Energy (DOE) N-EPA implementing procedures in 10 CFR Part 102 1; DOE Order 5440.1E; the DOE ``Secretarial Policy Statement on the National Environmental Policy Act`` of June 1994- Sandia NEPA compliance procedures-, and other CEQ and D… more
Date: August 1, 1995
Creator: Hansen, R.P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Analog fiber optic multiplexing techniques and results from the Hunters Trophy Experiment

Description: Due to the growth in the use of analog fiber optic data transmission systems at the Nevada Test Site and other locations, Sandia National Laboratories (SNL) has recognized the need to be able to multiplex several data channels per fiber. Wavelength-division, frequency-division, and time-division multiplex techniques have been investigated. A time-division system using optically-multiplexed laser transmitters driving a common receiver was fielded on the HUNTERS TROPHY event at the NTS. Stability… more
Date: November 1, 1993
Creator: Hansen, G. J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Shielding requirements for the transport of nuclear warhead components under decommissioning

Description: The requirements to carry out accurate shielding calculations involved with the safe off-site transportation of packages containing nuclear warhead components, special assemblies and radioactive materials are discussed. The need for (a) detailed information on the geometry and material composition of the packaging and radioactive load, (b) accurate representation of the differential energy spectra (dN/dE) for the neutron and gamma spectra emitted by the radioactive materials enclosed in the pac… more
Date: September 1, 1994
Creator: Hansen, L. F.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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{sup 3}He[pol]({rvec e}, e{prime})X and the neutron electromagnetic form factors

Description: Recent data for the spin-dependent A{sub T}, and A{sub TL}, asymmetries in {sup 3}He[pol]({rvec e}, e{prime}) quasielastic scattering are reviewed. The neutron electric and magnetic form factors are extracted from the data using a plane wave impulse approximation (PWIA) model, and the model uncertainties are estimated. The extracted G{sub M}{sup n} is in agreement with the dipole prediction as well as with other recent experiments. No meaningful result for G{sub E}{sup n} is obtained due to lar… more
Date: December 31, 1995
Creator: Hansen, J.O.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Nevada Test Site Wetlands Assessment

Description: This report identifies 16 Nevada Test Site (NTS) natural water sources that may be classified by the U.S. Army Corps of Engineers (USACE) as jurisdictional wetlands and identifies eight water sources that may be classified as waters of the United States. These water sources are rare, localized habitats on the NTS that are important to regional wildlife and to isolated populations of water tolerant plants and aquatic organisms. No field investigations on the NTS have been conducted in the past t… more
Date: May 1, 1997
Creator: Hansen, D. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Key Geomechanics Issues at the Waste Isolation Pilot Plant Geomechanics

Description: Mechanical and hydrological properties of rock salt provide excellent bases for geological isolation of hazardous materials. Regulatory compliance determinations for the Waste Isolation Pilot Plant (WIPP) stand as testament to the widely held conclusion that salt provides excellent isolation properties. The WIPP saga began in the 1950s when the U.S. National Academy of Sciences (NAS) recommended a salt vault as a promising solution to the national problem of nuclear waste disposal. For over 20 … more
Date: September 1, 1999
Creator: Hansen, Francis D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Scalability of preconditioners as a strategy for parallel computation of compressible fluid flow

Description: Parallel implementations of a Newton-Krylov-Schwarz algorithm are used to solve a model problem representing low Mach number compressible fluid flow over a backward-facing step. The Mach number is specifically selected to result in a numerically {open_quote}stiff{close_quotes} matrix problem, based on an implicit finite volume discretization of the compressible 2D Navier-Stokes/energy equations using primitive variables. Newton`s method is used to linearize the discrete system, and a preconditi… more
Date: May 1, 1996
Creator: Hansen, Glen A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Streamlining the process: A strategy for making NEPA work better and cost less

Description: When the National Environmental Policy Act (NEPA) was enacted in 1969, neither Congress nor the Federal Agencies affected anticipated that implementation of the NEPA process would result in the intolerable delays, inefficiencies, duplication of effort, commitments of excessive financial and personnel resources, and bureaucratic gridlock that have become institutionalized. The 1975 Council on Environmental Quality (CEQ) regulations, which were intended to make the NEPA process more efficient and… more
Date: May 1, 1998
Creator: Hansen, R.P.; Hansen, J.D. & Wolff, T.A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Geometric optimization

Description: An algorithm is presented which describes an application independent method for reducing the number of polygonal primitives required to faithfully represent an object. Reducing polygon count without a corresponding reduction in object detail is important for: achieving interactive frame rates in scientific visualization, reducing mass storage requirements, and facilitating the transmission of large, multi-timestep geometric data sets. This paper shows how coplanar and nearly coplanar polygons c… more
Date: September 1, 1993
Creator: Hinker, P. & Hansen, C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Preliminary assessment report for Olney Military Reservation, Installation 24175, Olney, Maryland. Installation Restoration Program

Description: This report presents the results of the preliminary assessment (PA) conducted by Argonne National Laboratory at the Maryland Army National Guard property near Olney, Maryland. Preliminary assessments of federal facilities are being conducted to compile the information necessary for completing preremedial activities and to provide a basis for establishing corrective actions in response to releases of hazardous substances. The principal objective of the PA is to characterize the site accurately a… more
Date: July 1, 1993
Creator: Hansen, J. & Rose, C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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