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Ablation Front Rayleigh-Taylor Growth Experiments in Spherically Convergent Geometry
Experiments were performed on the Nova laser, using indirectly driven capsules mounted in cylindrical gold hohlraums, to measure the Rayleigh-Taylor growth at the ablation front by time-resolved radiography. Modulations were preformed on the surface of Ge-doped plastic capsules. With initial modulations of 4 {micro}m, growth factors of about 6 in optical depth were seen, in agreement with simulations using the radiation hydrocode FCI2. With initial modulations of 1 {micro}m, growth factors of about 100-150 in optical depth were seen. The Rayleigh-Taylor (RT) instability at the ablation front in an inertial confinement fusion capsule has been the subject of considerable investigation. Much of this research has been concentrated on planar experiments, in which RT growth is inferred from radiography. The evolution is somewhat different in a converging geometry; the spatial wavelength decreases (affecting the onset of nonlinear saturation), and the shell thickens and compresses rather than decompressing as in a planar geometry. In a cylindrically convergent geometry, the latter effect is proportional to the radius, while in spherically convergent geometry, the latter effect is proportional to the radius squared. Experiments were performed on the Nova and Omega lasers in cylindrical geometry (using both direct and indirect drive) and have been performed …
Date:
November 3, 1999
Creator:
Glendinning, S. G.; Cherfils, C.; Colvin, J.; Divol, L.; Galmiche, D.; Haan, S. et al.
Object Type:
Article
System:
The UNT Digital Library
Abner Norman Statue
Photograph of a statue of Abner Norman, founder of Norman, OK.
Date:
November 3, 1999
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Abner Norman Statue
Photograph of a statue of Abner Norman, founder of Norman, OK.
Date:
November 3, 1999
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 100, No. 194, Ed. 1 Wednesday, November 3, 1999
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
November 3, 1999
Creator:
Bush, Michael
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Alvin Advertiser (Alvin, Tex.), Ed. 1 Wednesday, November 3, 1999
Weekly newspaper from Alvin, Texas that includes local, state, and national news along with advertising.
Date:
November 3, 1999
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Application of Integrated Reservoir Management and Reservoir Characterization to Optimize Infill Drilling
The eighteen 10-acre infill wells which were drilled as part of the field demonstration portion of the project are all currently in service with no operational problems. These wells consist of fourteen producing wells and four injection wells. The producing wells are currently producing a total of approximately 376 bopd, down from a peak rate of 900 bopd. The four injection wells are currently injecting a total of 140 bwipd. Unit production is currently averaging approximately 2,600 bopd, 12,000 bwpd and 18,000 bwipd.
Date:
November 3, 1999
Creator:
Company, Fina Oil and Chemical
Object Type:
Report
System:
The UNT Digital Library
The Baytown Sun (Baytown, Tex.), Vol. 78, No. 3, Ed. 1 Wednesday, November 3, 1999
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
November 3, 1999
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
The Challenge of Massively Parallel Computing
Since the mid-1980's, there have been a number of commercially available parallel computers with hundreds or thousands of processors. These machines have provided a new capability to the scientific community, and they been used successfully by scientists and engineers although with varying degrees of success. One of the reasons for the limited success is the difficulty, or perceived difficulty, in developing code for these machines. In this paper we discuss many of the issues and challenges in developing scalable hardware, system software and algorithms for machines comprising hundreds or thousands of processors.
Date:
November 3, 1999
Creator:
Womble, David E.
Object Type:
Article
System:
The UNT Digital Library
Characteristics of ICF Relevant Hohlraums Driven by X-Rays from a Z-Pinch
Radiation environments characteristic of those encountered during the low-temperature foot pulse and subsequent higher-temperature early-step pulses (without the foot pulse) required for indirect-drive ICF ignition on the National ignition Facility have been produced in hohlraums driven by x-rays from a z-pinch. These environments provide a platform to better understand the dynamics of full-scale NIF hohlraums, ablator material, and capsules prior to NIF completion. Radiation temperature, plasma fill, and wall motion of these hohlraums are discussed.
Date:
November 3, 1999
Creator:
Bowers, R. L.; Chandler, Gordon A.; Hebron, David E.; Leeper, Ramon J.; Matuska, W.; Mock, Raymond Cecil et al.
Object Type:
Article
System:
The UNT Digital Library
Chemical and Physical Changes in a Hydrolyzed Poly(ester urethane)
Hydrolytic degradation has been shown to be a significant problem for poly(ester urethane) elastomers exposed to high humidity environments. The ester group in the soft segment is particularly susceptible to hydrolysis. One of the products of this reaction is a carboxylic acid group that catalyses further hydrolysis. The resulting reduction in molecular weight leads to deterioration of the elastomer's mechanical properties. In this paper we have measured the extent of the hydrolysis reaction by {sup 13}C NMR spectroscopy. In addition we have measured the spin-spin relaxation time of the soft phase and followed the increase in mobility of these segments. Both measurements were performed on the solid polymer. These measurements provide an excellent monitoring tool of the chemical and physical state of polymer during the aging process.
Date:
November 3, 1999
Creator:
Assink, Roger A.; Celina, Mathias C. & Lang, David P.
Object Type:
Article
System:
The UNT Digital Library
The Clifton Record (Clifton, Tex.), Vol. 104, No. 88, Ed. 1 Wednesday, November 3, 1999
Semi-weekly newspaper from Clifton, Texas that includes local, state, and national news along with advertising.
Date:
November 3, 1999
Creator:
Smith, W. Leon
Object Type:
Newspaper
System:
The Portal to Texas History
The Collegian (Hurst, Tex.), Vol. 12, No. 10, Ed. 1 Wednesday, November 3, 1999
Weekly student newspaper published in Hurst, Texas and serving the Tarrant County College District that includes school news and information along with advertising.
Date:
November 3, 1999
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Commercial Maritime Industry: Updated Information on Federal Assessments
Testimony issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO discussed federal assessments--user fees, taxes, and other charges--levied on the commercial maritime industry, focusing on: (1) the federal agencies that levied assessments in fiscal year (FY) 1998 compared with FY 1991, the number of assessments levied, and the amounts they collected; (2) who pays the assessments and in which funds they were deposited in fiscal years 1991-1998; (3) new federal assessments that have been recently proposed; and (4) the status of the Harbor Maintenance Trust Fund, and the projected annual balances of the fund."
Date:
November 3, 1999
Creator:
United States. General Accounting Office.
Object Type:
Text
System:
The UNT Digital Library
Committee Funding Resolutions and Processes, 106th Congress
This report describes the procedures under which committee funding resolutions are considered in the two chambers, and 106th Congress action to review and approve committee operating budgets. Also noted are changes in the Senate’s committee funding processes to move from a session-based biennial funding process to one more closely matched to a fiscal year cycle. Tables at the end of the report show funds approved for the 105th Congress, and the funds requested, recommended, and approved for the 106th Congress for each House and Senate committee.
Date:
November 3, 1999
Creator:
Rundquist, Paul S. & Bullock, Faye M.
Object Type:
Report
System:
The UNT Digital Library
Continuous, automated manufacturing of string ribbon Si PV modules. PVMaT Phase 5A2 Subcontract: First Annual Report, 21 May 1998--20 May 1999
This report describes the first year of a 3-year PVMaT Phase 5A2 program. Evergreen Solar will soon be expanding into a multi-megawatt facility and the PVMaT work will be used to further the objective of a high-throughput automated production line in every aspect of PV module making from producing silicon ribbon to making a finished module. The project has four task areas for this first year: crystal growth; cell manufacturing; modules; and factory layout and automation. The vast majority of the work this first year has been in the crystal growth and cell manufacturing areas. Evergreen Solar has its own unique technology in each of these areas. In crystal growth, a key goal of this PVMaT project has been developing and deploying an improved string material. The high-temperature string materials are used to stabilize the edges of the growing silicon ribbon in the String Ribbon silicon sheet growth. The result has been one of the major successes of this first year. Significant cost reductions and yield improvements have emerged from this improved string material. In addition, some of the groundwork for automation of the String Ribbon crystal growth process has been laid and shows much promise. A method for controlling …
Date:
November 3, 1999
Creator:
Hanoka, J. I.
Object Type:
Report
System:
The UNT Digital Library
Cost-Effective Remediation of Depleted Uranium (DU) at Environmental Restoration Sites
Numerous sites in the United States and around the world are contaminated with depleted uranium (DU) in various forms. A prevalent form is fragmented DU originating from various scientific tests involving high explosives and DU during weapon-development programs, at firing practice ranges, or in war theaters where DU was used in armor-piercing projectiles. The contamination at these sites is typically very heterogeneous, with discrete, visually identifiable DU fragments mixed with native soil. The bulk-averaged DU activity is quite low, whereas DU fragments, which are distinct from the soil matrix, have much higher specific activity. DU is best known as a dark metal that is nearly twice as dense as lead, but DU in the environment readily weathers (oxidizes) to a distinctive bright yellow color that is quite visible. While the specific activity (amount of radioactivity per mass of soil) of DU is relatively low and presents only a minor radiological hazard, the fact that DU is radioactive and visually identifiable makes it desirable to remove the DU ''contamination'' from the environment. The typical approach to conducting this DU remediation is to use radiation-detection instruments to identify the contaminant and then to separate it from the adjacent soil, packaging it for …
Date:
November 3, 1999
Creator:
Miller, Mark; Galloway, Robert B.; Vanderpoel, Glenn; Johnson, E. D.; Copland, John & Salazar, Michael
Object Type:
Article
System:
The UNT Digital Library
Cost of Survival for Large Rapidity Gaps
None
Date:
November 3, 1999
Creator:
Levin, E.
Object Type:
Article
System:
The UNT Digital Library
A design method for an intuitive web site
The paper describes a methodology for designing a web site for human factor engineers that is applicable for designing a web site for a group of people. Many web pages on the World Wide Web are not organized in a format that allows a user to efficiently find information. Often the information and hypertext links on web pages are not organized into intuitive groups. Intuition implies that a person is able to use their knowledge of a paradigm to solve a problem. Intuitive groups are categories that allow web page users to find information by using their intuition or mental models of categories. In order to improve the human factors engineers efficiency for finding information on the World Wide Web, research was performed to develop a web site that serves as a tool for finding information effectively. The paper describes a methodology for designing a web site for a group of people who perform similar task in an organization.
Date:
November 3, 1999
Creator:
Quinniey, M. L.; Diegert, K. V.; Baca, B. G.; Forsythe, J. C. & Grose, E.
Object Type:
Article
System:
The UNT Digital Library
Exploring the Limits to NIF Capsule Coupling
Our original ignition ''point designs'' (circa 1992) for the National Ignition Facility (NIF) were made energetically conservative to provide margin for uncertainties in laser absorption, x-ray conversion efficiency and hohlraum-capsule coupling. Since that time, extensive experiments on Nova and Omega and their related analysis indicate that NIF coupling efficiency may be almost ''as good as we could hope for''. Given close agreement between experiment and theory/modeling, we can credibly explore target enhancements which couple more of NIF's energy to an ignition capsule. We find that 3-4X increases in absorbed capsule energy appear possible, providing a potentially more robust target and {approx}10X increase in capsule yield.
Date:
November 3, 1999
Creator:
Suter, L.; Rothenberg, J.; Munro, D.; Van Wonterghem, B. & Haan, S.
Object Type:
Article
System:
The UNT Digital Library
Export Controls: International Space Station Technology Transfers
A letter report issued by the General Accounting Office with an abstract that begins "Pursuant to a congressional request, GAO reviewed the National Aeronautics and Space Administration's (NASA) implementation of federal export control regulations for International Space Station technology transfers, focusing on: (1) the licenses granted to NASA to export space station-related technology and commodities and plans to export encryption technology; (2) the results of internal and external assessments of NASA's export control program; and (3) NASA's actions to implement audit recommendations."
Date:
November 3, 1999
Creator:
United States. General Accounting Office.
Object Type:
Report
System:
The UNT Digital Library
The Express-Star (Chickasha, Okla.), Ed. 1 Wednesday, November 3, 1999
Daily newspaper from Chickasha, Oklahoma that includes local, state, and national news along with advertising.
Date:
November 3, 1999
Creator:
Bush, Kent
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Field demonstration and transition of SCAPS direct push VOC in-situ sensing technologies
This project demonstrated two in-situ volatile organic compound (VOC) samplers in combination with the direct sampling ion trap mass spectrometer (DSITMS). The technologies chosen were the Vadose Sparge and the Membrane Interface Probe (MIP) sensing systems. Tests at two demonstration sites showed the newer VOC technologies capable of providing in situ contaminant measurements at two to four times the rate of the previously demonstrated Hydrosparge sensor. The results of this project provide initial results supporting the utility of these new technologies to provide rapid site characterization of VOC contaminants in the subsurface.
Date:
November 3, 1999
Creator:
Davis, William M.
Object Type:
Report
System:
The UNT Digital Library
Fission-Based Electric Propulsion for Interstellar Precursor Missions
This paper reviews the technology options for a fission-based electric propulsion system for interstellar precursor missions. To achieve a total {Delta}V of more than 100 km/s in less than a decade of thrusting with an electric propulsion system of 10,000s Isp requires a specific mass for the power system of less than 35 kg/kWe. Three possible configurations are described: (1) a UZrH-fueled,NaK-cooled reactor with a steam Rankine conversion system,(2) a UN-fueled gas-cooled reactor with a recuperated Brayton conversion system, and (3) a UN-fueled heat pipe-cooled reactor with a recuperated Brayton conversion system. All three of these systems have the potential to meet the specific mass requirements for interstellar precursor missions in the near term. Advanced versions of a fission-based electric propulsion system might travel as much as several light years in 200 years.
Date:
November 3, 1999
Creator:
Houts, Michael G.; Lenard, Roger X.; Lipinski, Ronald J.; Patton, Bruce; Poston, David & Wright, Steven A.
Object Type:
Article
System:
The UNT Digital Library
Flawed Assumptions, Models and Decision Making: Misconceptions Concerning Human Elements in Complex System
The history of high consequence accidents is rich with events wherein the actions, or inaction, of humans was critical to the sequence of events preceding the accident. Moreover, it has been reported that human error may contribute to 80% of accidents, if not more (dougherty and Fragola, 1988). Within the safety community, this reality is widely recognized and there is a substantially greater awareness of the human contribution to system safety today than has ever existed in the past. Despite these facts, and some measurable reduction in accident rates, when accidents do occur, there is a common lament. No matter how hard we try, we continue to have accidents. Accompanying this lament, there is often bewilderment expressed in statements such as, ''There's no explanation for why he/she did what they did''. It is believed that these statements are a symptom of inadequacies in how they think about humans and their role within technological systems. In particular, while there has never been a greater awareness of human factors, conceptual models of human involvement in engineered systems are often incomplete and in some cases, inaccurate.
Date:
November 3, 1999
Creator:
FORSYTHE,JAMES C. & WENNER,CAREN A.
Object Type:
Article
System:
The UNT Digital Library