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18,638 Matching Results
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Use of INSAR in surveillance and control of a large field project
In this paper, we introduce a new element of our [1] multilevel, integrated surveillance and control system: satellite Synthetic Aperture Radar interferometry (InSAR) images of oil field surface. In particular, we analyze five differential InSAR images of the Belridge Diatomite field, CA, between 11/98 and 12/99. The images have been reprocessed and normalized to obtain the ground surface displacement rate. In return, we have been able to calculate pixel-by-pixel the net subsidence of ground surface over the entire field area. The calculated annual subsidence volume of 19 million barrels is thought to be close to the subsidence at the top of the diatomite. We have also compared the 1999 rate of surface displacement from the satellite images with the surface monument triangulations between 1942 and 1997. We have found that the maximum rate of surface subsidence has been steadily increasing from -0.8 ft/year in 1988-97 to -1 ft/year in 1998-99. The respective rates of uplift of the field fringes also increased from 0.1 ft/year to 0.24 ft/year. In 1999, the observed subsidence rate exceeded by 4.5 million barrels the volumetric deficit of fluid injection.
Date:
June 1, 2000
Creator:
Patzek, T.W. & Silin, D.B.
Object Type:
Article
System:
The UNT Digital Library
THE USE OF MATERIAL PROTECTION, CONTROL AND ACCOUNTING (MPC&A) TECHNOLOGIES FOR CONTROL OF EXCESS NUCLEAR MATERIAL: ANALYSIS, SYNTHESIS AND DEMONSTRATION
None
Date:
June 1, 2000
Creator:
KROUGLOVA, L.; ISAEV, N. & AL, ET
Object Type:
Article
System:
The UNT Digital Library
The Use of Radar Methods to Determine Moisture Content in the Vadose Zone
The objective of our three-year research project is to determine the optimal way to use radar methods to obtain information about moisture content in the vadose zone. In our research we will focus on two specific aspects of the link between radar images and moisture content. The first aspect or question we address is: Can we use a measure of the dielectric constant of a volume of the subsurface to determine the moisture content of that volume? The second question we address is involved specifically with the issue of spatial heterogeneity. Rather than using radar data to get estimates of moisture content at specific locations, can we use the radar data to directly obtain information about the way in which the level of moisture content varies spatially?
Date:
June 1, 2000
Creator:
Knight, Rosemary
Object Type:
Report
System:
The UNT Digital Library
Using Allele-Specific PCR with Molecular Beams as a Means for Genotyping the Diallelic Indels
The first Specific Aim for this grant was to identify and characterize an average of 500 human insertion/deletion polymorphisms per grant year (1500 total). This task was carried out entirely at MMRF. They substantially exceeded this goal by confirming about 2,300 diallelic indels. Complete characterization information for these polymorphisms is available from the Marshfield web site. A manuscript describing results for the first 2,000 diallelic indels was published earlier this year in the American Journal of Human Genetics. The Second Specific Aim of the grant was to investigate and develop improved methods for analysis of diallelic polymorphisms using miniaturized DNA arrays. The initial genotyping technology efforts focused on various hybridization and extension protocols with oligo arrays on flow-through channel glass. Channel glass is a porous material that permits reagents to be passed through the arrays. They devoted roughly 19 months at the beginning of the grant in pursuit of this methodology, but for various technological reasons, progress was limited.
Date:
June 1, 2000
Creator:
Doktycz, M.J. & Weber, J.L. (Marshfield Medical Research Foundation)
Object Type:
Report
System:
The UNT Digital Library
USING TREES TO REMEDIATE GROUNDWATERS CONTAMINATED WITH CHLORINATED HYDROCARBONS
Research objectives: (1) increase the metabolic degradation of chlorinated hydrocarbons in plants and (2) understand the mechanism of CHC degradation in plant tissue
Date:
June 1, 2000
Creator:
Strand, Stuart E. & PI: Gordon, Milton P.
Object Type:
Report
System:
The UNT Digital Library
Utilization of Kinetic Isotope Effects for the Concentration of Tritium
Work is in progress to develop methods for concentrating tritium in water based on large primary isotope effects in catalytic redox processes. Basic research is being conducted to develop the chemistry of a complete cyclic process. The process will remove tritium from H2O by concentrating it with respect to protio-water. This research involves developing chemical cycles that produce high concentration factors for HTO based on the discrimination of CH and C-T bonds in oxidation reactions. Several steps are required in a cyclic process for the concentration of tritium in water. In the first step, the tritium is incorporated in an organic compound. H-T discrimination occurs as the tritium containing compound is oxidized in a step involving a Ru(IV) oxo complex. Strong primary kinetic isotope effects lead to the oxidation of C-H bonds in preference to C-T bonds, and this reaction leads to concentration of tritium in the organic compound. The reduced form of the ruthenium compound can be reoxidized so that the oxidation step can be made catalytic.
Date:
June 1, 2000
Creator:
Brown, Gilbert M.; Meyer, Thomas J. & Moyer, Bruce A.
Object Type:
Report
System:
The UNT Digital Library
UV-Shifted Durable Silver Coating for Astronomical Mirrors
Silver has the highest reflectance of all of the metals, but it tarnishes in the presence of sulfides, chlorides, and oxides in the atmosphere. Also, the silver reflectance is very low at wavelengths below 400 nm making aluminum more desirable mirror coating for the UV region. They have found a way to prevent silver tarnishing by sandwiching the silver layer between two thin layers of NiCrN{sub x}, and to extend the metal's high reflectance down to 200 nm by depositing the (thin) Ag layer on top of Al. Thus, the uv is transmitted through the thin Ag layer below 400 nm wavelength, and is reflected from the Al layer underneath. This UV-shifted durable coating provides a valuable alternative to the aluminum coating for telescope mirror coatings where high throughput and durability are important considerations. The throughput for a telescope with, say, six reflections from silver coatings is (0.97){sup 6} = 83% compared to (0.92){sup 6} = 60% for aluminum coatings, or 28% less. The use of silver coatings allows more photons to be collected by primary mirror. Aluminum also has a reflectance dip at 850 nm caused by inter-band transitions which is eliminated by placing the thin Ag layer on …
Date:
June 1, 2000
Creator:
Thomas, N.L. & Wolfe, J.
Object Type:
Article
System:
The UNT Digital Library
VARIATIONAL METHODS FOR ELLIPTIC PROBLEMS IN FLUID MODELS
None
Date:
June 1, 2000
Creator:
Smolarkiewicz, P. K. & Margolin, L. G.
Object Type:
Article
System:
The UNT Digital Library
Verification of Candu Spent Fuel in Sealed Storage Casks
None
Date:
June 1, 2000
Creator:
Veal, K. D.; Abhold, M. E. & Menlove, H. O.
Object Type:
Article
System:
The UNT Digital Library
Waste Volume Reduction Using Surface Characterization and Decontamination by Lase Ablation
Laser ablation is being studied as a method both for removing and for measuring contaminated surface layers from concrete. The objectives of this research are to determine the mechanism and efficacy of laser ablation, to understand the chemistry of contaminated concrete surfaces, and to chemically and physically characterize the captured ablation effluent, which would become the stored waste. The method is attractive because it adds no additional waste, offers fine control over the amount of material removed, can work on cracked, curved or irregular surfaces, and can potentially be instrumented for real-time contamination analysis. While the focus of this project is on concrete, the technology should be applicable to any surface requiring contaminant removal.
Date:
June 1, 2000
Creator:
Pellin, Michael; Savina, Michael; Reed, Claude; Xu, Zhiyue & Wang, Yong
Object Type:
Report
System:
The UNT Digital Library
Water resources development in Santa Clara Valley, California: insights into the human-hydrologic relationship
Groundwater irrigation is critical to food production and, in turn, to humankind's relationship with its environment. The development of groundwater in Santa Clara Valley, California during the early twentieth century is instructive because (1) responses to unsustainable resource use were largely successful; (2) the proposals for the physical management of the water, although not entirely novel, incorporated new approaches which reveal an evolving relationship between humans and the hydrologic cycle; and (3) the valley serves as a natural laboratory where natural (groundwater basin, surface watershed) and human (county, water district) boundaries generally coincide. Here, I investigate how water resources development and management in Santa Clara Valley was influenced by, and reflective of, a broad understanding of water as a natural resource, including scientific and technological innovations, new management approaches, and changing perceptions of the hydrologic cycle. Market demands and technological advances engendered reliance on groundwater. This, coupled with a series of dry years and laissez faire government policies, led to overdraft. Faith in centralized management and objective engineering offered a solution to concerns over resource depletion, and a group dominated by orchardists soon organized, fought for a water conservation district, and funded an investigation to halt the decline of well …
Date:
June 1, 2000
Creator:
Reynolds, Jesse L. & Narasimhan, T.N.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
West Valley Demonstration Project site environmental report, calendar year 1999
This report represents a single, comprehensive source of off-site and on-site environmental monitoring data collected during 1999 by environmental monitoring personnel for the West Valley Demonstration Project (WVDP), West Valley, New York. The environmental monitoring program and results are discussed in the body of this report. The monitoring data are presented in the appendices. The data collected provide an historical record of radionuclide and radiation levels from natural and manmade sources in the survey area and document the quality of the groundwater on and around the WVDP and the quality of the air and water discharged by the WVDP.
Date:
June 1, 2000
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Winning, June 2000
Pamphlet containing information about Texas Lottery winners, scratch-off prizes, new games, and more.
Date:
June 2000
Creator:
Texas Lottery Commission
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
X-RAY YIELD SCALING STUDIES PERFORMED ON THE OMEGA LASER
None
Date:
June 1, 2000
Creator:
WORKMAN, J. B. & KYRALA, G. A.
Object Type:
Article
System:
The UNT Digital Library