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2-D Finite Element Cable and Box IEMP Analysis
A 2-D finite element code has been developed for the solution of arbitrary geometry cable SGEMP and box IEMP problems. The quasi- static electric field equations with radiation- induced charge deposition and radiation-induced conductivity y are numerically solved on a triangular mesh. Multiple regions of different dielectric materials and multiple conductors are permitted.
Date:
December 17, 1998
Creator:
Scivner, G.J. & Turner, C.D.
Object Type:
Article
System:
The UNT Digital Library
9 M.y. record of southern Nevada climate from Yucca Mountain secondary minerals
Yucca Mountain, Nevada, is presently the object of intense study as a potential permanent repository for the Nation`s high-level radioactive wastes. The mountain consists of a thick sequence of volcanic tuffs within which the depth to water table ranges from 500 to 700 meters below the land surface. This thick unsaturated zone (UZ), which would host the projected repository, coupled with the present day arid to semi-arid climate, is considered a favorable attribute of the site. Evaluation of the site includes defining the relation between climate variability, as the input function or driver of site- and regional-scale ground-water flow, and the possible future transport and release of radionuclides to the accessible environment. Secondary calcite and opal have been deposited in the UZ by meteoric waters that infiltrated through overlying soils and percolated through the tuffs. The oxygen isotopic composition ({delta}{sup 18}O values) of these minerals reflect contemporaneous meteoric waters and the {delta}{sup 13}C values reflect soil organic matter, and hence the resident plant community, at the time of infiltration. Recent U/Pb age determinations of opal in these occurrences, coupled with the {delta}{sup 13}C values of associated calcite, allow broadbrush reconstructions of climate patterns during the past 9 M.y.
Date:
December 1998
Creator:
Whelan, Joseph F. & Moscati, Richard J.
Object Type:
Article
System:
The UNT Digital Library
An 800-MeV proton radiography facility for dynamic experiments
The capability has been successfully developed at the Los Alamos Nuclear Science Center (LANSCE) to utilize a spatially and temporally prepared 800-MeV proton beam to produce proton radiographs. A series of proton bursts are transmitted through a dynamically varying object and transported, via a unique magnetic lens system, to an image plane. The magnetic lens system permits correcting for the effects of multiple coulomb scattering which would otherwise completely blur the spatially transmitted information at the image plane. The proton radiographs are recorded on either a time integrating film plate or with a recently developed multi-frame electronic imaging camera system. The latter technique permits obtaining a time dependent series of proton radiographs with time intervals (modulo 358 ns) up to many microseconds and variable time intervals between images. One electronically shuttered, intensified, CCD camera is required per image. These cameras can detect single protons interacting with a scintillating fiber optic array in the image plane but also have a dynamic range which permits recording radiographs with better than 5% statistics for observation of detailed density variations in the object. A number of tests have been carried out to characterize the quality of the proton radiography system for absolute mass determination, …
Date:
December 1, 1998
Creator:
King, N.S.P.; Adams, K. & Ables, E.
Object Type:
Article
System:
The UNT Digital Library
129Iodine: a new tracer for surface water/groundwater interaction
We measured <sup>129</sup>I/<sup>127</sup>I ratios in about 30 major rivers and found a strong signal of anthropogenic <sup>129</sup>I in all of them (Moran et al., 1998). The effect of local point sources ,such as the Savannah River Facility and Hanford Facility are easily observed in the Savannah and Columbia Rivers, respectively. Likewise, the Rhine and Rhone rivers in Switzerland, have ratios well above �background� due to their proximity to the main global source in northwest Europe. Away from local point sources, one observes a mixing trend between atmospherically-delivered <sup>129</sup>I from European nuclear fuel reprocessing facilities, and low-ratio iodine derived from soil weathering (Moran et al., 1998). This anthropogenic <sup>129</sup>I should be easily observable in soil water and shallow groundwater anywhere in the northern hemisphere.
Date:
December 1, 1998
Creator:
Hoehn, E; Oktay, S & Santschi, P H
Object Type:
Article
System:
The UNT Digital Library
15th Street News (Midwest City, Okla.), Vol. 28, No. 12, Ed. 1 Friday, December 4, 1998
Newspaper from Rose State College in Midwest City, Oklahoma that includes national, local, and campus news along with advertising.
Date:
December 4, 1998
Creator:
Pace, Joshua
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
15th Street News (Midwest City, Okla.), Vol. 28, No. 13, Ed. 1 Friday, December 11, 1998
Newspaper from Rose State College in Midwest City, Oklahoma that includes national, local, and campus news along with advertising.
Date:
December 11, 1998
Creator:
Pace, Joshua
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
[16th annual "Black Music and the Civil Rights Movement" concert commercial for KXAS]
Video footage from The Black Academy of Arts and Letters of a short 15-second commercial aired on the KXAS news channel for the 16th annual Black Music and the Civil Rights Movement Concert held on January 17th, 1999 at the Meyerson symphony center. The footage begins at the 00:14 second mark and shows a brief clip of a choir singing under a narrator's voice giving the date and location of the concert.
Date:
December 21, 1998
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
1998 Annual Report - Environmental Restoration Division
This is a 1998 annual report for Environmental Restoration. Environmental Restoration's accomplishments were significant in 1998. The division, including its support organizations, completed one year without a lost time accident. It also met 111 enforceable agreement milestones on time, with more than 80% ahead of schedule. Funds used to meet these milestones were effectively utilized and $9.63 million in regulatory scope was added. Twelve new, innovative technologies were deployed, enabling ER to achieve significant progress on major field remediation projects, including: Remediation of 25 acres of radioactive burial ground; Removal of 1,300 batteries for recycling; Removal and safe storage of a radioactive underground tank; Extraction of 115,000 pounds of solvent; and Installation of 9 new recirculation wells and a second GeoSiphon Cell for additional removal of solvent Final Records of Decision were made for 9 base unit sites. No Further Action decisions were made for 61 additional sites.
Date:
December 30, 1998
Creator:
Davis, L.B.
Object Type:
Report
System:
The UNT Digital Library
1998 Complex Systems Summer School
For the past eleven years a group of institutes, centers, and universities throughout the country have sponsored a summer school in Santa Fe, New Mexico as part of an interdisciplinary effort to promote the understanding of complex systems. The goal of these summer schools is to provide graduate students, postdoctoral fellows and active research scientists with an introduction to the study of complex behavior in mathematical, physical, and living systems. The Center for Nonlinear Studies supported the eleventh in this series of highly successful schools in Santa Fe in June, 1998.
Date:
December 15, 1998
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
1998 Pacific Northwest Loads and Resources Study: The White Book.
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 the 1981 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 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 inventory planning to determine 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 conditions, including expectations of river flows and runoff, market opportunities, availability of reservoir storage, …
Date:
December 1, 1998
Creator:
United States. Bonneville Power Administration.
Object Type:
Report
System:
The UNT Digital Library
2D neural hardware versus 3D biological ones
This paper will present important limitations of hardware neural nets as opposed to biological neural nets (i.e. the real ones). The author starts by discussing neural structures and their biological inspirations, while mentioning the simplifications leading to artificial neural nets. Going further, the focus will be on hardware constraints. The author will present recent results for three different alternatives of implementing neural networks: digital, threshold gate, and analog, while the area and the delay will be related to neurons' fan-in and weights' precision. Based on all of these, it will be shown why hardware implementations cannot cope with their biological inspiration with respect to their power of computation: the mapping onto silicon lacking the third dimension of biological nets. This translates into reduced fan-in, and leads to reduced precision. The main conclusion is that one is faced with the following alternatives: (1) try to cope with the limitations imposed by silicon, by speeding up the computation of the elementary silicon neurons; (2) investigate solutions which would allow one to use the third dimension, e.g. using optical interconnections.
Date:
December 1998
Creator:
Beiu, V.
Object Type:
Article
System:
The UNT Digital Library
[5th annual Christmas and Kwanzaa concert: "Celebrate!"]
Video footage from The Black Academy of Arts and Letters recorded during their 5th annual Christmas and Kwanzaa concert entitled "Celebrate!" held on December 18th, 1998. The footage covers the entire concert of six DISD mixed-gender high school choirs performing four categories of choral styles including classical, spiritual, Christmas, and gospel totaling 16 songs.
Date:
December 18, 1998
Creator:
unknown
Object Type:
Video
System:
The UNT Digital Library
Abilene Philharmonic Playbill: December 5-January 30, 1999
Program for an Abilene Philharmonic concert that ran from December 5th, 1998 to January 30th during the 49th season. It includes information about the pieces performed, artists and musicians, and advertising from local companies.
Date:
December 1998
Creator:
Abilene Philharmonic
Object Type:
Pamphlet
System:
The Portal to Texas History
Absolute Intensities of the Vacuum Ultraviolet Spectra in a Metal-Etch Plasma Processing Discharge
In this paper we report absolute intensities of vacuum ultraviolet and near ultraviolet emission lines (4.8 eV to 18 eV ) for aluminum etching discharges in an inductively coupled plasma reactor. We report line intensities as a function of wafer type, pressure, gas mixture and rf excitation level. IrI a standard aluminum etching mixture containing C12 and BC13 almost all the light emitted at energies exceeding 8.8 eV was due to neutral atomic chlorine. Optical trapping of the WV radiation in the discharge complicates calculations of VUV fluxes to the wafer. However, we see total photon fluxes to the wailer at energies above 8.8 eV on the order of 4 x 1014 photons/cm2sec with anon- reactive wafer and 0.7 x 10 `4 photons/cm2sec with a reactive wtier. The maj ority of the radiation observed was between 8.9 and 9.3 eV. At these energies, the photons have enough energy to create electron-hole pairs in Si02, but may penetrate up to a micron into the Si02 before being absorbed. Relevance of these measurements to vacuum-W photon-induced darnage of Si02 during etching is discussed.
Date:
December 9, 1998
Creator:
Woodworth, J. R.; Blain, M. G.; Jarecki, R. L.; Hamilton, T. W. & Aragon, B. P.
Object Type:
Article
System:
The UNT Digital Library
Accelerated Durability Testing of Electrochromic Windows
Prototype electrochromic windows made by several different U.S. companies have been tested in our laboratory for their long-term durability. Samples were subjected to alternate coloring and bleaching voltage cycles while exposed to simulated on 1-sun irradiance in a temperature-controlled environmental chamber with low relative humidity. The samples inside the chamber were tested under a matrix of different conditions. These conditions include: cycling at different temperatures (65 C, 85 C, and 107 C) under the irradiance, cycling versus no-cycling under the same irradiance and temperature, testing with different voltage waveforms and duty cycles with the same irradiance and temperature, cycling under various filtered irradiance intensities, and simple thermal exposure with no irradiance or cycling. The electro-optical characteristics of the samples were measured between 350 and 1,100 nm every 4,000 cycles for up to 20,000 cycles. Photographs of the samples were taken periodically wi th a digital camera to record cosmetic defects, the extent of residual coloration, and overall coloration and bleaching uniformity of the samples. Our results indicate that the most important cause of degradation is the combination of continuous cycling, elevated temperature, and irradiance. The relative importance of these variables, when considered synergistically or separately, depends on the particular device …
Date:
December 29, 1998
Creator:
Tracy, C. E.; Zhang, J. G.; Benson, D. K.; Czanderna, A. W. & Deb, S. K.
Object Type:
Article
System:
The UNT Digital Library
Acceleration of polarized proton beams
The acceleration of polarized beams in circular accelerators is complicated by the numerous depolarizing spin resonances. Using a partial Siberian snake and a rf dipole that ensure stable adiabatic spin motion during acceleration has made it possible to accelerate polarized protons to 25 GeV at the Brookhaven AGS. Full Siberian snakes are being developed for RHIC to make the acceleration of polarized protons to 250 GeV possible. A similar scheme is being studied for the 800 GeV HERA proton accelerator.
Date:
December 31, 1998
Creator:
Roser, T.
Object Type:
Article
System:
The UNT Digital Library
Accelerator production of tritium 700 MHz and 350 MHz klystron test results
The Accelerator Production of Tritium project (APT) utilizes a 1,700 MeV, 100 mA proton Linac. The radio frequency (RF) power is provided by 244 continuous wave (CW) klystron amplifiers at 350 MHz and 700 MHz. All but three of the klystrons operate at a frequency of 700 MHz. The 350 MHz klystrons have a nominal output power of 1.2 MW at a DC-to-RF conversion efficiency of 65%. They are modulating-anode klystrons and operate at a beam voltage and current of 95 kV and 20 A. The design is based on the CERN klystron. The 700 MHz klystron is a new development for APT. Three 700 MHz klystrons are currently under development. Two vendors are each developing a baseline klystron that has a nominal output power of 1.0 MW at a DC-to-RF conversion efficiency of 65%. A 700 MHz klystron is also under development that promises to provide an efficiency in excess of 70%. The 700 MHz klystrons operate at a maximum beam voltage of 95 kV and a maximum beam current of 17 A. The test results of these klystrons will be presented and the design features will be discussed.
Date:
December 31, 1998
Creator:
Rees, D.; Lynch, M. & Tallerico, P.
Object Type:
Report
System:
The UNT Digital Library
Accomplishments of the American-Polish Program for Elimination of Low Emissions in Krakow
Since 1990 the US Department of Energy (DOE) has been involved in a program aimed at reducing air pollution caused by small, coal-fired sources in Poland. The activity is focused on the city of Cracow, Poland with the intention that results will be applicable and extendable to the entire region. The effort under this program has been focused into 5 main areas of interest as follows: (1) energy conservation and extension of central station district heating; (2) replacement of coal- and coke-fired boilers with natural gas-fired boilers; (3) replacement of coal-fired home stoves with electric heating appliances; (4) reduction of emissions from stoker-fired boiler houses; and (5) reduction of emissions from coal-fired home heating stoves.
Date:
December 31, 1998
Creator:
Butcher, T. A. & Pierce, B.
Object Type:
Article
System:
The UNT Digital Library
Accretion onto black holes: The power generating mechanism
This is the final report of a three-year, Laboratory Directed Research and Development (LDRD) project at Los Alamos National Laboratory (LANL). The physical relationships among accretion disks, quasars, black holes, collimated radio sources and galactic dynamos previously has been only weakly related without explicit cause and effect. We have constructed a physical evolution from large, primordial density perturbations to {open_quotes}damped Lyman alpha clouds,{close_quotes} to galaxy formation, to black holes, jets, and the the galactic dynamo. We have derived the general relativistic distortions of radiation emitted from close to the black hole and thereby have a new observational test of the central engine. The physics of accretion disks, the astrophysical dynamo, and magnetic reconnection are the least understood physical phenomena in astrophysics. They are still less understood in the general relativity (GR) field close to the black hole. This lack of physical understanding frustrates a quantitative evaluation of observations that define the evolution from the early universe to star formation. We have made progress in this understanding.
Date:
December 31, 1998
Creator:
Colgate, S.A.; Hills, J.G. & Miller, W.A.
Object Type:
Report
System:
The UNT Digital Library
Accurate polyatomic quantum dynamics studies of combustion reactions. Final progress report, July 1, 1994--June 30, 1998
This program is designed to develop accurate yet practical computational methods, primarily based on time-dependent quantum mechanics, for studying the dynamics of polyatomic reactions beyond the atom-diatom systems. Efficient computational methodologies are developed and the applications of these methods to practical chemical reactions relevant to combustion processes are carried out. The program emphasizes the practical aspects of accurate quantum dynamics calculations in order to understand, explain and predict the dynamical properties of important combustion reactions. The aim of this research is to help provide not only qualitative dynamics information but also quantitative prediction of reaction dynamics of combustion reactions at the microscopic level. Through accurate theoretical calculations, the authors wish to be able to quantitatively predict reaction cross sections and rate constants of relatively small gas-phase reactions from first principles that are of direct interest to combustion. The long-term goal of this research is to develop practical computational methods that are capable of quantitatively predicting dynamics of more complex polyatomic gas-phase reactions that are of interest to combustion.
Date:
December 31, 1998
Creator:
Zhang, J. Z. H.
Object Type:
Report
System:
The UNT Digital Library
Achieving 800kW CW Beam Power and Continuing Energy Improvements in CEBAF
During the past year, CEBAF at Jefferson Lab has demonstrated its full capacity of sustained 800 kW beam power. All systems performed as intended. The energy stability at the design parameters of 4.0 GeV, 200 muA CW beam was measured to be better than 3x10{sup -5} rms. During the fall of 1997, physics experiments were conducted using 4.4 GeV beam. Having demonstrated the benefits of in situ helium/rf processing of SRF cavities for increasing the energy reach of CEBAF, we began a program of processing all installed cryomodules. This processing has proven effective against the principal gradiation limitation of the SRF cavities in CEBAF: discharges at the cold rf waveguide window, induced by electron field emission in the cavities. Such effects limit approximately half of the cavities. Regular operation at 5.0 GeV is just beginning, and preparations are underway to support 5.5 GeV in early 1999.
Date:
December 1, 1998
Creator:
Reece, Charlie
Object Type:
Article
System:
The UNT Digital Library
Achieving Sustainable Construction in Affordable Housing
An energy-efficient design and construction checklist and information sheets on energy-efficient design and construction are two products being developed. These products will help affordable housing providers take the first steps toward a whole-house approach to the design and implementation of energy-efficient construction practices. The checklist presents simple and clear guidance on energy improvements that can be readily addressed now by most affordable housing providers. The information sheets complement the checklist by providing installation instructions and material specifications that are accompanied by detailed graphics. The information sheets also identify benefits of recommended energy-efficiency measures and procedures including cost savings and impacts on health and comfort. This paper presents details on the checklist and information sheets and discusses their use in two affordable housing projects.
Date:
December 7, 1998
Creator:
Barcik, M. K.; Creech, D. B. & Ternes, M. P.
Object Type:
Article
System:
The UNT Digital Library
Acid-Base Interactions at the Molecular Level: Adhesion and Friction Studies with Interfacial Force Microscopy
To examine the forces of acid-base adhesive interactions at the molecular level, we utilize the scanning probe Interracial Force Microscope (IFM). Unlike cantilever-based atomic force microscopes, the EM is a non-compliant, mechanically stable probe that provides a complete adhesive profile without jump-to-contact. In this way, we are able to quantitatively measure the work of adhesion and bond energies at well-defined, nanometer-scale single asperity contacts. In particular, we will discuss the displacement-controlled adhesive forces between self-assembled monolayer of functionalized alkanethiols strongly bound to a gold substrate and a similarly functionalized tip. We also discuss a method utilizing decoupled lateral and normal force sensors to simultaneously observe the onset of both friction and chemical bond formation. Measurements show that friction can be directly attributed to bond formation and rupture well before repulsive contact.
Date:
December 9, 1998
Creator:
Burns, A. R.; Carpick, R. W.; Houston, J. E. & Michalske, T. A.
Object Type:
Article
System:
The UNT Digital Library
Acousto-optically tuned isotopic CO{sub 2} lasers for long-range differential absorption LIDAR
The authors are developing 2--100 kHz repetition rate CO{sub 2} lasers with milliJoule pulse energies, rapid acousto-optic tuning and isotopic gas mixes, for Differential Absorption LIDAR (DIAL) applications. The authors explain the tuning method, which uses a pair of acousto-optic modulators and is capable of random access to CO{sub 2} laser lines at rates of 100 kHz or more. The laser system is also described, and they report on performance with both normal and isotopic gas mixes.
Date:
December 1, 1998
Creator:
Thompson, D. C.; Busch, G. E.; Hewitt, C. J.; Remelius, D. K.; Shimada, Tsutomu; Strauss, C. E. M. et al.
Object Type:
Article
System:
The UNT Digital Library