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The 8.4 MW Modulator/Regulator Power Systems for the Electron Cyclotron Heating Facility Upgrade at DIII-D
Over the next three years the DIII-D National Fusion Facility at General Atomics will upgrade its electron cyclotron heating (ECH) capability from the present 3 MW at 110 GHz to 10 MW of injected microwave power. There will be ten gyrotron tubes supplied by five 8.4 MW modulator/regulator (M/R) power systems. The project has gained considerable leverage from the acquisition of surplus hardware from the MFTF program that was conducted at LLNL in the early 1980s. One of these systems had been refurbished and converted for use as an ECH power supply earlier. The experience gained and the lessons learned from operating that system have proved valuable in guiding the engineering of the new systems. This paper provides an overview of the power system design and a report on the present status of the project.
Date:
December 1999
Creator:
Pronko, S. G. E. & Baggest, D. S.
Object Type:
Article
System:
The UNT Digital Library
The 110 GHz Gyrotron System on DIII-D: Gyrotron Tests and Physics Results
The DIII-D tokamak has installed a system with three gyrotrons at the 1 MW level operating at 110 GHz. Physics experiments on electron cyclotron current drive, heating, and transport have been performed. Good efficiency has been achieved both for on-axis and off-axis current drive with relevance for control of the current density profile leading to advanced regimes of tokamak operation, although there is a difference between off-axis ECCD efficiency inside and outside the magnetic axis. Heating efficiency is excellent and electron temperatures up to 10 keV have been achieved. The gyrotron system is versatile, with poloidal scan and control of the polarization of the injected rf beam. Phase correcting mirrors form a Gaussian beam and focus it into the waveguide. Both perpendicular and oblique launch into the tokamak have been used. Three different gyrotron designs are installed and therefore unique problems specific to each have been encountered, including parasitic oscillations, mode hops during modulation and polarization control problems. Two of the gyrotrons suffered damage during operations, one due to filament failure and one due to a vacuum leak. The repairs and subsequent testing will be described. The transmission system uses evacuated, windowless waveguide and the three gyrotrons have output windows …
Date:
December 1, 1999
Creator:
Lohr, J.; Calahan, P.; Callis, R. W.; Chu, T. S.; deGrassie, J. S.; Gorelov, I. et al.
Object Type:
Article
System:
The UNT Digital Library
1999 Pacific Northwest Loads and Resources Study.
The Pacific Northwest Loads and Resources Study (White Book) is published annually by BPA and establishes the planning basis for supplying electricity to customers. It serves a dual purpose. First, the White Book presents projections of regional and Federal system load and resource capabilities, along with relevant definitions and explanations. Second, the White Book serves as a benchmark for annual BPA determinations made pursuant to its regional power sales contracts. Specifically, BPA uses the information in the White Book for determining the notice required when customers request to increase or decrease the amount of power purchased from BPA. The White Book will not be used in calculations for the 2002 regional power sales contract subscription process. The White Book compiles information obtained from several formalized resource planning reports and data submittals, including those from the Northwest Power Planning Council (Council) and the Pacific Northwest Utilities Conference Committee (PNUCC). The White Book is not an operational planning guide, nor is it used for determining BPA revenues. Operation of the Federal Columbia River Power System (FCRPS) is based on a set of criteria different from that used for resource planning decisions. Operational planning is dependent upon real-time or near-term knowledge of system …
Date:
December 1, 1999
Creator:
United States. Bonneville Power Administration.
Object Type:
Report
System:
The UNT Digital Library
N-Acylethanolamines in Signal Transduction of Elicitor Perception. Attenuation of Alkalinization Response and Activation of Defense Gene Expression
Article on N-acylethanolamines in signal transduction of elicitor perception and the attenuation of alkalinization response and activation of defense gene expression.
Date:
December 1999
Creator:
Tripathy, Swati; Venables, Barney J. & Chapman, Kent D.
Object Type:
Article
System:
The UNT Digital Library
Adhesion/Diffusion Barrier Layers for Copper Integration: Carbon-Silicon Polymer Films and Tantalum Substrates
The Semiconductor Industry Association (SIA) has identified the integration of copper (Cu) with low-dielectric-constant (low-k) materials as a critical goal for future interconnect architectures. A fundamental understanding of the chemical interaction of Cu with various substrates, including diffusion barriers and adhesion promoters, is essential to achieve this goal. The objective of this research is to develop novel organic polymers as Cu/low-k interfacial layers and to investigate popular barrier candidates, such as clean and modified tantalum (Ta) substrates. Carbon-silicon (C-Si) polymeric films have been formed by electron beam bombardment or ultraviolet (UV) radiation of molecularly adsorbed vinyl silane precursors on metal substrates under ultra-high vacuum (UHV) conditions. Temperature programmed desorption (TPD) studies show that polymerization is via the vinyl groups, while Auger electron spectroscopy (AES) results show that the polymerized films have compositions similar to the precursors. Films derived from vinyltrimethyl silane (VTMS) are adherent and stable on Ta substrates until 1100 K. Diffusion of deposited Cu overlayers is not observed below 800 K, with dewetting occurred only above 400 K. Hexafluorobenzene moieties can also be incorporated into the growing film with good thermal stability. Studies on the Ta substrates demonstrate that even sub-monolayer coverages of oxygen or carbide on polycrystalline …
Date:
December 1999
Creator:
Chen, Li
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
An aerial radiological survey of the Nevada Test Site
A team from the Remote Sensing Laboratory conducted an aerial radiological survey of the US Department of Energy's Nevada Test Site including three neighboring areas during August and September 1994. The survey team measured the terrestrial gamma radiation at the Nevada Test Site to determine the levels of natural and man-made radiation. This survey included the areas covered by previous surveys conducted from 1962 through 1993. The results of the aerial survey showed a terrestrial background exposure rate that varied from less than 6 microroentgens per hour (mR/h) to 50 mR/h plus a cosmic-ray contribution that varied from 4.5 mR/h at an elevation of 900 meters (3,000 feet) to 8.5 mR/h at 2,400 meters (8,000 feet). In addition to the principal gamma-emitting, naturally occurring isotopes (potassium-40, thallium-208, bismuth-214, and actinium-228), the man-made radioactive isotopes found in this survey were cobalt-60, cesium-137, europium-152, protactinium-234m an indicator of depleted uranium, and americium-241, which are due to human actions in the survey area. Individual, site-wide plots of gross terrestrial exposure rate, man-made exposure rate, and americium-241 activity (approximating the distribution of all transuranic material) are presented. In addition, expanded plots of individual areas exhibiting these man-made contaminations are given. A comparison is made …
Date:
December 1, 1999
Creator:
Hendricks, T J & Riedhauser, S R
Object Type:
Report
System:
The UNT Digital Library
The Afro-British Slave Narrative: The Rhetoric of Freedom in the Kairos of Abolition
Access:
Use of this item is restricted to the UNT Community
The dissertation argues that the development of the British abolition movement was based on the abolitionists' perception that their actions were kairotic; they attempted to shape their own kairos by taking temporal events and reinterpreting them to construct a kairotic process that led to a perceived fulfillment: abolition. Thus, the dissertation examines the rhetorical strategies used by white abolitionists to construct an abolitionist kairos that was designed to produce salvation for white Britons more than it was to help free blacks. The dissertation especially examines the three major texts produced by black persons living in England during the late eighteenth centuryIgnatius Sancho's Letters of the Late Ignatius Sancho (1782), Ottobauh Cugoano's Thoughts and Sentiments on the Evil of Slavery (1787), and Olaudah Equiano's The Interesting Narrative of the Life of Olaudah Equiano, or Gustavus Vassa, the African (1789)to illustrate how black rhetoric was appropriated by whites to fulfill their own kairotic desires. By examining the rhetorical strategies employed in both white and black rhetorics, the dissertation illustrates how the abolitionists thought the movement was shaped by, and how they were shaping the movement through, kairotic time. While the dissertation contends that the abolition movement was rhetorically designed to provide redemption, …
Date:
December 1999
Creator:
Evans, Dennis F.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
The Age, Volume 22, Number 12, December 1999
Monthly publication containing information related to Chambers County, Texas, including current events of the Chambers County Historical Commission, the Wallisville Heritage Park, and the Chambers County historical and genealogical societies; reprinted newspaper articles about county events and citizens; and historical news and records.
Date:
December 1999
Creator:
Wallisville Heritage Park (Organization)
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Aktau Plastics Plant Explosives Material Report
The U.S. Department of Energy (DOE) has been cooperating with the Republic of Kazakhstanin Combined Threat Reduction (CTR) activities at the BN350 reactor located at the Mangyshlak Atomic Energy Complex (MAEC) in the city of Aktau, Kazakhstan since 1994. DOE contract personnel have been stationed at this facility for the last two years and DOE representatives regularly visit this location to oversee the continuing cooperative activities. Continued future cooperation is planned. A Russian news report in September 1999 indicated that 75 metric tons of organic peroxides stored at the Plastics Plant near Aktau were in danger of exploding and killing or injuring nearby residents. To ensure the health and safety of the personnel at the BN350 site, the DOE conducted a study to investigate the potential danger to the BN350 site posed by these materials at the Plastics Plant. The study conclusion was that while the organic peroxides do have hazards associated with them, the BN350 site is a safe distance from the Plastics Plant. Further, because the Plastics Plant and MAEC have cooperative fire-fighting agreements,and the Plastics Plant had exhausted its reserve of fire-fighting foam, there was the possibility of the Plastics Plant depleting the store of fire-fighting foam …
Date:
December 1, 1999
Creator:
CASE JR.,ROGER S.
Object Type:
Report
System:
The UNT Digital Library
Altus Times (Altus, Okla.), Vol. 100, No. 219, Ed. 1 Wednesday, December 1, 1999
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
December 1, 1999
Creator:
Bush, Michael
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Alvin Advertiser (Alvin, Tex.), Ed. 1 Wednesday, December 1, 1999
Weekly newspaper from Alvin, Texas that includes local, state, and national news along with advertising.
Date:
December 1, 1999
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
An Analysis of the Ability of an Instrument to Measure Quality of Library Service and Library Success
This study consisted of an examination of how service quality should be measured within libraries and how library service quality relates to library success. A modified version of the SERVQUAL instrument was evaluated to determine how effectively it measures library service quality. Instruments designed to measure information center success and information system success were evaluated to determine how effectively they measure library success and how they relate to SERVQUAL. A model of library success was developed to examine how library service quality relates to other variables associated with library success. Responses from 385 end users at two U.S. Army Corps of Engineers libraries were obtained through a mail survey. Results indicate that library service quality is best measured with a performance-based version of SERVQUAL, and that measuring importance may be as critical as measuring expectations for management purposes. Results also indicate that library service quality is an important factor in library success and that library success is best measured with a combination of SERVQUAL and library success instruments. The findings have implications for the development of new instruments to more effectively measure library service quality and library success as well as for the development of new models of library service …
Date:
December 1999
Creator:
Landrum, Hollis T.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
'...and one of time.': A Composition for Full Orchestra with Narration
Access:
Use of this item is restricted to the UNT Community
‘...and one of time.' is a reinterpretation of a small musical moment from Philip Glass' opera, Einstein on the Beach, centered around the phrase "Berne, Switzerland 1905." This reinterpretation is realized through the use of several different compositional techniques including spectral composition, micropolyphony and dodecaphony, as well as the application of extra-musical models developed by Alan Lightman, John Gardner, Italo Calvino and Albert Einstein.
Date:
December 1999
Creator:
Rinker, John Thomas
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Application of stochastic and artificial intelligence methods for nuclear material identification
Nuclear materials safeguard efforts necessitate the use of non-destructive methods to determine the attributes of fissile samples enclosed in special, non-accessible containers. To this end, a large variety of methods has been developed at the Oak Ridge National Laboratory (ORNL) and elsewhere. Usually, a given set of statistics of the stochastic neutron-photon coupled field, such as source-detector, detector-detector cross correlation functions, and multiplicities are measured over a range of known samples to develop calibration algorithms. In this manner, the attributes of unknown samples can be inferred by the use of the calibration results. The organization of this paper is as follows: Section 2 describes the Monte Carlo simulations of source-detector cross correlation functions for a set of uranium metallic samples interrogated by the neutrons and photons from a {sup 252}Cf source. From this database, a set of features is extracted in Section 3. The use of neural networks (NN) and genertic programming to provide sample mass and enrichment values from the input sets of features is illustrated in Sections 4 and 5, respectivelyl. Section 6 is a comparison of the results, while Section 7 is a brief summary of the work.
Date:
December 1, 1999
Creator:
Pozzi, S. & Segovia, F.J.
Object Type:
Report
System:
The UNT Digital Library
ASH EMISSIVITY CHARACTERIZATION AND PREDICTION
The increased use of western subbituminous coals has generated concerns regarding highly reflective ash disrupting heat transfer in the radiant zone of pulverized-fuel boilers. Ash emissivity and reflectivity is primarily a function of ash particle size, with reflective deposits expected to consist of very small refractory ash materials such as CaO, MgO, or sulfate materials such as Na{sub 2}SO{sub 4}. For biomass fuels and biomass-coal blends, similar reflectivity issues may arise as a result of the presence of abundant organically associated calcium and potassium, which can transform during combustion to fine calcium, and potassium oxides and sulfates, which may act as reflective ash. The relationship of reflectivity to ash chemistry is a second-order effect, with the ash particle size distribution and melting point being determined by the size and chemistry of the minerals present in the starting fuel. Measurement of the emission properties of ash and deposits have been performed by several research groups (1-6) using both laboratory methods and measurements in pilot- and full-scale combustion systems. A review of the properties and thermal properties of ash stresses the important effect of ash deposits on heat transfer in the radiant boiler zone (1).
Date:
December 1, 1999
Creator:
Zygarlicke, Christopher J.; McCollor, Donald P. & Crocker, Charlene R.
Object Type:
Report
System:
The UNT Digital Library
Asleep in the Arms of God
A work of creative fiction in the form of a short novel, Asleep in the Arms of God is a limited-omniscient and omniscient narrative describing the experiences of a man named Wafer Roberts, born in Jack County, Texas, in 1900. The novel spans the years from 1900 to 1925, and moves from the Keechi Valley of North Texas, to Fort Worth and then France during World War One, and back again to the Keechi Valley. The dissertation opens with a preface, which examines the form of the novel, and regional and other aspects of this particular work, especially as they relate to the postmodern concern with fragmentation and conditional identity. Wafer confronts in the novel aspects of his own questionable history, which echo the larger concern with exploitative practices including racism, patriarchy, overplanting and overgrazing, and pollution, which contribute to and climax in the postmodern fragmentation. The novel attempts to make a critique of the exploitative rage of Western civilization.
Date:
December 1999
Creator:
Clay, Kevin M.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
An assessment of the MCNP4C weight window
A new, enhanced weight window generator suite has been developed for MCNP version 4C. The new generator correctly estimates importances in either a user-specified, geometry-independent, orthogonal grid or in MCNP geometric cells. The geometry-independent option alleviates the need to subdivide the MCNP cell geometry for variance reduction purposes. In addition, the new suite corrects several pathologies in the existing MCNP weight window generator. The new generator is applied in a set of five variance reduction problems. The improved generator is compared with the weight window generator applied in MCNP4B. The benefits of the new methodology are highlighted, along with a description of its limitations. The authors also provide recommendations for utilization of the weight window generator.
Date:
December 1, 1999
Creator:
Culbertson, Christopher N. & Hendricks, John S.
Object Type:
Report
System:
The UNT Digital Library
An Audit Report on Medicaid Services at the Department of Mental Health and Mental Retardation
Report of the Texas State Auditor's Office related to evaluating the Department of Mental Health and Mental Retardation's (Department) management controls over Intermediate Care Facilities for the Mentally Retarded (ICF/MR) and Home and Community Services (HCS) programs.
Date:
December 1999
Creator:
Texas. Office of the State Auditor.
Object Type:
Report
System:
The Portal to Texas History
Baseline Concentrations of Radionuclides and Trace Elements in Soils and Vegetation around the DARHT Facility: Construction Phase (1998)
The Mitigation Action Plan for the Dual-Axis Radiographic Hydrodynamic Test (DARHT) facility at Los Alamos National Laboratory mandates the establishment of baseline concentrations for potential environmental contaminants. To this end, concentrations of {sup 3}H, {sup 137}Cs, {sup 90}Sr, {sup 238}Pu, {sup 239,240}Pu, {sup 241}Am, and {sup tot}U and Ag, As, Ba, Be, Cd, Cr, Cu, Hg, Ni, Pb, Sb, Se, and Tl were determined in surface and subsurface soils, sediments, and vegetation (overstory and understory) around the DARHT facility during the construction phase in 1998 (this is the third of a four year baseline study). Also, volatile (VOC) and semivolatile (SVOC) organic compounds were measured in soils and sediments. Most radionuclides and trace metals in soil, sediment, and vegetation were similar to past years at DARHT and were within regional background concentrations. Exceptions were concentrations of {sup 90}Sr, Be, Ba, and total U in some samples--these elements exceeded upper limit regional background concentrations (e.g., >mean plus two std dev). No VOCs and very few SVOCs were detected in soils and sediments at DARHT. Mean ({+-} std dev) radionuclide and trace element concentrations measured in soil, sediment, and vegetation summarized over a three-year period (construction phase) are summarized.
Date:
December 1, 1999
Creator:
Fresquez, P. R.; Ebinger, M. H.; Haagenstad, H. T. & L. Naranjo, Jr.
Object Type:
Report
System:
The UNT Digital Library
Baytown Connection (Baytown, Tex.), Vol. 2, No. 6, Ed. 1 Wednesday, December 1, 1999
Newspaper from Baytown, Texas published by the Exxon Corporation that includes news and information of interest to current and former employees of the Baytown facilities.
Date:
December 1, 1999
Creator:
Pfennig, Glena
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 78, No. 27, Ed. 1 Wednesday, December 1, 1999
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
December 1, 1999
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
Benchmarks in American Higher Education: Selected Approaches for Distance Education Copyright and Intellectual Property Policies
An evaluation of American higher education distance education programs was conducted to explore how they approach intellectual property, copyright and information sharing/antitrust policy concerns for Internet-based programs. An evaluation of the current status of distance education and Internet-based training in higher education was conducted through a pilot study that included a random sample of 223 accredited institutions. Seventy-seven institutions responded to a survey, of which there were 14 Research I&II, 17 Doctorate I&II, and 46 Master's I&II institutions included in this study. A review of institutional policy approaches for these 77 institutions was conducted via Internet Web site and bulletin review. A multiple-case study was also conducted which included 10 of the top 30 accredited distance education institutions in America. Policy approaches were examined for all institutions and differences were discussed for public and private institutions as well as the following Carnegie Class institutions- Research I&II, Doctorate I&II and Master's I&II. Ten percent of all institutions that responded to the pilot study developed a written policy addressing antitrust/information-sharing concerns. Additionally, the data indicated that 22% of institutions in these Carnegie Class ranges published copyright and intellectual property policy on their institutions' Internet Web site. Ninety percent of the institutions in …
Date:
December 1999
Creator:
Smith, Kenneth D.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
A benthic carbon budget for the Continental Slope off Cape Hatteras, NC
None
Date:
December 1, 1999
Creator:
Blair, Neal
Object Type:
Report
System:
The UNT Digital Library
Bill of Materials (BOM) for FEMIS Version 1.4.7
This document describes the hardware and software required for the Federal Emergency Management Information System version 1.4.7 (FEMIS v1.4.7) released by Pacific Northwest National Laboratory (PNNL). Information included in this document about hardware and software requirements is subject to change.
Date:
December 1, 1999
Creator:
Arp, Jonathan A.; Downing, Timothy R.; Gackle, Philip P.; Homer, Brian J.; Johnson, Daniel M.; Johnson, Ranata L. et al.
Object Type:
Text
System:
The UNT Digital Library