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ADVANCED TECHNOLOGIES FOR STRIPPER GAS WELL ENHANCEMENT
As part of Task 1 in Advanced Technologies for Stripper Gas Well Enhancement, Schlumberger-Holditch Reservoir Technologies (H-RT) has joined with two Appalachian Basin producers, Great Lakes Energy Partners, LLC, and Belden & Blake Corporation to develop methodologies for identification and enhancement of stripper wells with economic upside potential. These industry partners have provided us with data for more than 700 wells in northwestern Pennsylvania. Phase 1 goals of this project are to develop and validate methodologies that can quickly and cost-effectively identify wells with enhancement potential. We have continued to enhance and streamline our software, and we are testing the final stages of our new Microsoft{trademark} Access/Excel based software. We are continuing to process the information and are identifying potential candidate wells that can be used in Phase 2 to validate the new methodologies. In addition, preparation of the final technical report is underway. During this quarter, we have presented our project and discussed the software to numerous Petroleum Technology Transfer Council (PTTC) workshops located in various regions of the United States.
Date:
January 1, 2002
Creator:
Boyer, Charles M., II & MacDonald, Ronald J.
Object Type:
Report
System:
The UNT Digital Library
The advancement of public awareness, concerning TRU waste characterization, using a virtual document.
Building public trust and confidence through openness is a goal of the DOE Carlsbad Field Office for the Waste Isolation Pilot Plant (WIPP). The objective of the virtual document described in this paper is to give the public an overview of the waste characterization steps, an understanding of how waste characterization instrumentation works, and the type and amount of data generated from a batch of drums. The document is intended to be published on a web page andlor distributed at public meetings on CDs. Users may gain as much information as they desire regarding the transuranic (TRU) waste characterization program, starting at the highest level requirements (drivers) and progressing to more and more detail regarding how the requirements are met. Included are links to: (1) drivers (which include laws, permits and DOE Orders) (2) various characterization steps required for transportation and disposal under WIPP's Hazardous Waste Facility Permit (3) physical/chemical basis for each characterization method (4) types of data produced (5) quality assurance process that accompanies each measurement
Date:
January 1, 2002
Creator:
West, Thomas B.; Burns, Timothy P.; Estill, Wesley G.; Riggs, M. J. (Matt J.); Taggart, Daniel P. & Punjak, Wayne A.
Object Type:
Article
System:
The UNT Digital Library
Advances in recording scattered light changes in crustacean nerve with electrical activation
We investigated optical changes associated with crustacean nerve stimulation using birefringent and large angle scattered light. Improved detection schemes disclosed high temporal structure of the optical signals and allowed further investigations of biophysical mechanisms responsible for such changes. Most studies of physiological activity in neuronal tissue use techniques that measure the electrical behavior or ionic permeability of the nerve, such as voltage or ion sensitive dyes injected into cells, or invasive electric recording apparatus. While these techniques provide high resolution, they are detrimental to tissue and do not easily lend themselves to clinical applications in humans. Electrical and chemical components of neural excitation evoke physical responses observed through changes in scattered and absorbed light. This method is suited for in-vivo applications. Intrinsic optical changes have shown themselves to be multifaceted in nature and point to several different physiological processes that occur with different time courses during neural excitation. Fast changes occur concomitantly with electrical events, and slow changes parallel metabolic events including changes in blood flow and oxygenation. Previous experiments with isolated crustacean nerves have been used to study the biophysical mechanisms of fast optical changes. However, they have been confounded by multiple superimposed action potentials which make it difficult …
Date:
January 1, 2002
Creator:
Carter, Kathleen M.; Rector, David M.; Martinez, Anne T.; Guerra, Francisco M. & George, John S.
Object Type:
Article
System:
The UNT Digital Library
The Advocate, Volume 7, Issue 1, January-March 2002
Quarterly update providing information on environmental regulations for small businesses and local governments in Texas.
Date:
January 2002
Creator:
Texas Commission on Environmental Quality. Small Business and Environmental Assistance Division.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
AHF Booster Tracking with SIMPSONS.
The booster lattice for the Advanced Hydrotest Facility at Los Alamos was tracked in 3-D with the program SIMPSONS, using the full, symplectic lattice from TEAPOT, using the full set of magnet and misalignment errors, as well as full space-charge effects. The only corrections included were a rough closed-orbit correction and chromaticity correction. The lattice was tracked for an entire booster cycle, from multi-turn injection through acceleration to the top energy of 4 GeV, approximately 99,000 turns. An initial injection intensity of 4x1Ol2, injected in 25 turns, resulted in a final intensity of 3 . 2 {approx} 1 0a' {approx}t 4 GeV. Results of the tracking, including emittance growth, particle loss, and particle tune distributions are presented.
Date:
January 1, 2002
Creator:
Johnson, David E. & Neri, Filippo
Object Type:
Article
System:
The UNT Digital Library
Los Alamos beam halo experiment: comparing theory, simulation and experiment.
We compare macroparticle simulations with measurements from a proton beam-halo experiment in a 52-quadrupole periodic-focusing channel. Three different initial distributions with the same Courant-Snyder parameters and emittances, but different shapes, predict different beam profiles in the transport system. Input distributions with greater population in the tails produce larger rates of emittance growth, a result that is qualitatively consistent with the particle-core model of halo formation in mismatched beams. The simulations underestimate the growth rate of halo and emittance for mismatched beams. Better agreement between simulations and experiment may require an input distribution that represents more accurately the tails of the real input beam.
Date:
January 1, 2002
Creator:
Wangler, Thomas P., & Qiang, J. (Ji)
Object Type:
Article
System:
The UNT Digital Library
Algorithmic aspects of topology control problems for ad hoc networks
Topology control problems are concerned with the assignment of power values to nodes of an ad hoc network so that the power assignment leads to a graph topology satisfying some specified properties. This paper considers such problems under several optimization objectives, including minimizing the maximum power and minimizing the total power. A general approach leading to a polynomial algorithm is presented for minimizing maximum power for a class of graph properties, called monotone properties. The difficulty of generalizing the approach to properties that are not monoione is pointed out. Problems involving the minimization of total power are known to be NP-complete even for simple graph properties. A general approach that leads to an approximation algorithm for minimizing the total power for some monotone properties is presented. Using this approach, a new approximation algorithm for the problem of minimizing the total power for obtaining a 2-node-connected graph is obtained. It is shown that this algorithm provides a constant performance guarantee. Experimental results from an implementation of the approximation algorithm are also presented.
Date:
January 1, 2002
Creator:
Liu, Rui; Lloyd, Errol L.; Marathe, Madhav V.; Ramanathan, Ram & Ravi, S. S.
Object Type:
Article
System:
The UNT Digital Library
Analysis of americium-beryllium neutron source composition using the FRAM code
The FRAM code was originally developed to analyze high-resolution gamma spectra from plutonium items. Its capabilities have since been expanded to include analysis of uranium spectra. The flexibility of the software also enables a capable spectroscopist to use FRAM to analyze spectra in which neither plutonium nor uranium is present in significant amounts. This paper documents the use of FRAM to determine the {sup 239}Pu/{sup 241}Am, {sup 243}Am/{sup 241}Am, {sup 237}Np/{sup 241}Am, and {sup 239}Np/{sup 241}Am ratios in americium-beryllium neutron sources. The effective specific power of each neutron source was calculated from the ratios determined by FRAM in order to determine the americium mass of each of these neutron sources using calorimetric assay. We will also discuss the use of FRAM for the general case of isotopic analysis of nonplutonium, nonuranium items.
Date:
January 1, 2002
Creator:
Hypes, P. A. (Philip A.); Bracken, D. S. (David S.); Sampson, Thomas E. & Taylor, W. A. (Wayne A.)
Object Type:
Article
System:
The UNT Digital Library
Analysis of digital timing methods with BaF(sub 2) scintillators
Various digital methods were examined for determining the relative arrival times of pulses from to 5.08 x 2.54 cm BaF{sub 2} scintillators. In this study, pulses from the photomultiplier tubes were digitized by a 1 Gs/s analog to digital converter and post processed with multiple techniques. These techniques include: (1) leading edge discrimination, (2) moment-analysis, (3) constant fraction discrimination, (4) digital constant traction discrimination, (5) triangular pulse shaping with a leading edge linear regression, and (6) pulse-shape fitting. Average timing resolutions of 456 {+-} 8 ps were obtained with constant fraction discrimination, which is slightly higher than the analog average resolution of 419 {+-} 7 ps. This study explores the application of these digital techniques for pulse-timing applications and their potential advantages and limitations.
Date:
January 1, 2002
Creator:
Nelson, M. A. (Mark A.); Rooney, B. D. (Brian D.); Dinwiddie, D. R. (Derek R.) & Brunson, G. S. (Glenn S.)
Object Type:
Article
System:
The UNT Digital Library
Analysis of gas constituents from sealed containers of plutonium oxide materials.
The safe storage of pure and impure plutonium oxide materials in sealed containers is a current Department of Energy (DOE) concern. Plutonium oxides sorb moisture from the atmosphere, and the subsequent radiolytic and/or chemical decomposition of the water has been thought to generate excessive hydrogen pressures inside sealed containers. Eleven sealed containers with ten grams each of plutonium oxide materials have been studied for up to four years. The sealed materials were representative materials from the DOE complex and contain less than 0.5 weight percent water. The samples were kept at ambient conditions. We report the final gas analysis of the headspace gas of these containers using gas chromatography, mass spectrometry and Raman spectroscopy. The results show that none of the containers have pressurized significantly, and that hydrogen was not generated in significant quantities.
Date:
January 1, 2002
Creator:
Worl, L. A. (Laura A.); Veirs, D. K. (Douglas Kirk); Allen, Tom; Berg, J. M. (John M.); Harradine, D. M. (David M.) & Padilla, D. D. (Dennis D.)
Object Type:
Article
System:
The UNT Digital Library
Analysis of lightning-related risk in outdoor high explosive research.
The behavior of materials at high strain rates can be studied using high explosives (HE) as an energy source. Such hydrodynamic experiments may be performed on full-scale systems, requiring kilogram quantities of HE and therefore are performed at outdoor facilities. One such facility is DARHT-the Dual-Axis Radiographic Hydrodynamic Test facility located at Los Alamos National Laboratory in northern New Mexico. DARHT is a very large flash x-ray machine. The high-intensity, short-duration x-ray pulses are beamed through the hydrodynamic experiment to an x-ray camera. Density variations in the materials produce variations in the transmitted beam that are recorded by the camera. The information in these images is used to understand the basic behavior of materials subjected to very high dynamic pressures and to evaluate the accuracy of computer codes used to model the associated phenomena.
Date:
January 1, 2002
Creator:
Eisenhawer, S. W. (Stephen W.) & Bott, T. F. (Terrence F.)
Object Type:
Article
System:
The UNT Digital Library
Analyzing the effect of routing protocols on media access control protocols in radio networks
We study the effect of routing protocols on the performance of media access control (MAC) protocols in wireless radio networks. Three well known MAC protocols: 802.11, CSMA, and MACA are considered. Similarly three recently proposed routing protocols: AODV, DSR and LAR scheme 1 are considered. The experimental analysis was carried out using GloMoSim: a tool for simulating wireless networks. The main focus of our experiments was to study how the routing protocols affect the performance of the MAC protocols when the underlying network and traffic parameters are varied. The performance of the protocols was measured w.r.t. five important parameters: (i) number of received packets, (ii) average latency of each packet, (iii) throughput (iv) long term fairness and (v) number of control packets at the MAC layer level. Our results show that combinations of routing and MAC protocols yield varying performance under varying network topology and traffic situations. The result has an important implication; no combination of routing protocol and MAC protocol is the best over all situations. Also, the performance analysis of protocols at a given level in the protocol stack needs to be studied not locally in isolation but as a part of the complete protocol stack. A novel …
Date:
January 1, 2002
Creator:
Barrett, C. L. (Christopher L.); Drozda, M. (Martin); Marathe, A. (Achla) & Marathe, M. V. (Madhav V.)
Object Type:
Article
System:
The UNT Digital Library
Annual Report RCRA Post-Closure Monitoring and Inspections for CAU 112: Area 23 Hazardous Waste Trenches, Nevada Test Site, Nevada, for the period October 2000-July 2001
This annual Neutron Soil Moisture Monitoring report provides an analysis and summary for site inspections, meteorological information, and neutron soil moisture monitoring data obtained at the Area 23 Hazardous Waste Trenches Resource Conservation and Recovery Act (RCRA) unit, located in Area 23 of the Nevada Test Site, Nye County, Nevada, during the October 2000--July 2001 monitoring period. Inspections of the Area 23 Hazardous Waste Trenches RCRA unit are conducted to determine and document the physical condition of the covers, facilities, and any unusual conditions that could impact the proper operation of the waste unit closure. Physical inspections of the closure were completed quarterly and indicated that the site is in good condition with no significant findings noted. An annual subsidence survey of the elevation markers was conducted in July 2001. There has been no subsidence at any of the markers since monitoring began eight years ago. Precipitation for the period October 2000 through July 2001 was 9.42 centimeters (cm) (3.71 inches [in]) (U.S. National Weather Service, 2001). The prior year annual rainfall (January 2000 through December 2000) was 10.44 cm (4.1 1 in.). The recorded average annual rainfall for this site from 1972 to January 2000 is 14.91 cm (5.87 …
Date:
January 1, 2002
Creator:
Tobiason, D. S.
Object Type:
Report
System:
The UNT Digital Library
The anomalous suppression of [pi][sub 2](1670)->b[sub 1](1235)[pi]
We show that current experimental data indicate that the strong decay mode {pi}{sub 2} {yields} b{sub 1}{pi} is anomalously small (more than 3 times smaller than all other decay modes of the {pi}{sub 2}). This acts as a powerful discriminator for and against various decay models. Nonrelativistic quark models with spin-1 pair creation, e.g. {sup 3}P{sub 0} (flux-tube breaking) and {sup 3}S{sub 1} and {sup 3}D{sub 1} (chromo-electric string-breaking) models, as well as lowest order one-boson (in this case {pi}) emission models, can accommodate the experimental data because of a quark-spin selection rule. Models that violate the selection rule, e.g. higher order one-boson emission decay mechanisms, as well as mixing with other Fock states and relativistic effects, may be constrained by the small {pi}{sub 2} {yields} b{sub 1}{pi} decay.
Date:
January 1, 2002
Creator:
Page, P. R. (Philip R.)
Object Type:
Article
System:
The UNT Digital Library
Anthony Quadrangle
Topographic map of a portion of Texas from the United States Geological Survey (USGS) project. The map includes towns, historic or notable sites, bodies of water, and other geologic features. Scale 1:24000
Date:
2002
Creator:
Geological Survey (U.S.)
Object Type:
Map
System:
The Portal to Texas History
Application of EPA wetland research program approach to a floodplain wetland restoration assessment.
Kolka, R.K., C.C. Trettin, E.A. Nelson, C.D. Barton, and D.E. Fletcher. 2002. Application of the EPA Wetland Research Program Approach to a floodplain wetland restoration assessment. J. Env. Monitoring & Restoration 1(1):37-51. Forested wetland restoration assessment is difficult because of the timeframe necessary for the development of a forest ecosystem. The development of a forested wetland ecosystem includes the recovery of hydrology, soils, vegetation, and faunal communities. To assess forested wetland restoration projects, measures need to be developed that are sensitive to early changes in community development and are predictive of future conditions. In this study we apply the EPS's Wetland Research Program's (WRP) approach to assess the recovery of two thermally altered riparian wetland systems in South Carolina. In one of the altered wetland systems, approximately 75% of the wetland was planted with bottomland tree seedlings in an effort to hasten recovery. Individual studies addressing hydrology, soils, vegetation, and faunal communities indicate variable recovery responses.
Date:
January 1, 2002
Creator:
Kolka, R. K.; Trettin, C. C.; Nelson, E. A.; Barton, C. D. & Fletcher, D. E.
Object Type:
Article
System:
The UNT Digital Library
Application of the RCP01 Code to Depletion of a PWR Spent Nuclear Fuel Sample
An essential component of a proposed burnup credit methodology for commercial PWR spent nuclear fuel (SNF) is the validation of the tools used for isotopic and criticality calculations. A number of benchmark experiments have been analyzed to establish the validation of the tools and to determine biases and corrections. To benchmark the RCP01 Monte Carlo computer code, an isotopic validation study was conducted for one of the benchmark experiments, a SNF sample taken from the Calvert Cliffs PWR Unit-1 (CCPU1). Modeling considerations and nuclear data associated with the RCP01 transport/depletion calculations are discussed. The accuracy of RCP01 calculations is demonstrated to be very good when RCP01 results are compared to destructive chemical assay data for major actinides and important fission products in the SNF sample.
Date:
January 1, 2002
Creator:
Joo, Hansem
Object Type:
Article
System:
The UNT Digital Library
An approach to multiplicity counting for a versatile new sensor for plutonium assay with a very short die-away time, and independent measurements of neutrons and gamma rays
A unique detector design incorporating a {sup 6}Li-based capture medium, ZnS scintillator, and wavelength shifting optical fibers is the basis of a new neutron coincidence counter for measurements of plutonium in highly-impure residues. The sensor elements have a high efficiency for detecting neutrons and exhibit excellent gamma-ray discrimination based on pulse-shape analysis. The short die-away time of the counter that is based on these detector elements allows coincidence-gate settings shorter than 10 microseconds. This qualifies the technology for measurements of materials with high yields of uncorrelated neutrons from {sup 241}Am(alpha,n) reactions. The characteristics of the new neutron counter will be illustrated with test data from measurements of plutonium, {sup 252}Cf, and gamma-ray sources. The integrated electronics design of the new detector also permits the simultaneous but independent measurement of both neutrons and gamma rays. Recent test results that illustrate some unique applications of the sensor's versatility will also be presented.
Date:
January 1, 2002
Creator:
Belian, A. B. (Anthony B.); Browne, M. C. (Michael C.); Clay, W. A. (William A.); Geist, W. H. (William H.); Nguyen, H.; Ianakiev, K. D. et al.
Object Type:
Article
System:
The UNT Digital Library
AQUEOUS BIPHASE EXTRACTION FOR PROCESSING OF FINE COAL
The objective of this research project is to develop an aqueous biphase extraction process for the treatment of fine coals. Aqueous biphase extraction is an advanced separation technology that relies on the ability of an aqueous system consisting of a water-soluble polymer and another component, e.g., another polymer, an inorganic salt, or a nonionic surfactant, to separate into two immiscible aqueous phases. The principle behind the partition of solid particles in aqueous biphase systems is the physicochemical interaction between the solid surface and the surrounding liquid solution. In order to remove sulfur and mineral matter from fine coal with aqueous biphasic extraction, it is necessary to know the partitioning behavior of coal, as well as the inorganic mineral components. Therefore, in this research emphasis was placed on the partitioning behavior of fine coal particles as well as model fine inorganic particles in aqueous biphase systems.
Date:
January 1, 2002
Creator:
Osseo-Asare, K. & Zeng, X.
Object Type:
Report
System:
The UNT Digital Library
The Archaeological Potential of a Northeast Denton County Ecotone: An Archaeological Evaluation of Additions to the Mustang Water Supply Corporation
Report of archaeological evaluation and investigation of proposed new pipeline routes in northeastern Denton County, Texas.
Date:
2002
Creator:
Tood, Jesse & Skinner, S. Alan
Object Type:
Report
System:
The Portal to Texas History
The Arctic Ocean and Climate Change: A Scenario for the US Navy
This report is an edited compilation of the views of the panel of experts convened by the United States Arctic Research Commission to assist the Navy in considering the effects of climate change on their operations in and around the Arctic Ocean in the mid to lat Twenty First Century.
Date:
2002
Creator:
United States. Arctic Research Commission.
Object Type:
Report
System:
The UNT Digital Library
Arlington Quadrangle
Topographic map of a portion of Texas from the United States Geological Survey (USGS) project. The map includes towns, historic or notable sites, bodies of water, and other geologic features. Scale 1:24000
Date:
2002
Creator:
Geological Survey (U.S.)
Object Type:
Map
System:
The Portal to Texas History
Asbestos Programs Branch Update, Volume 9, Number 1, January-April 2002
Newsletter of the Texas Department of Health Asbestos Programs Branch discussing news and updates of the agency; changes to laws, regulations, and other policies related to asbestos usage and removal; and other asbestos-related information.
Date:
January 2002
Creator:
Texas. Department of Health. Asbestos Programs Branch.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Asotin Creek Instream Habitat Alteration Projects : Habitat Evaluation, Adult and Juvenile Habitat Utilization and Water Temperature Monitoring : 2001 Progress Report.
Asotin Creek originates from a network of deeply incised streams on the slopes of the Blue Mountains of southeastern Washington. The watershed drains an area of 322 square miles that provides a mean annual flow of 74 cfs. The geomorphology of the watershed exerts a strong influence on biologic conditions for fish within the stream. Historic and contemporary land-use practices have had a profound impact on the kind, abundance, and distribution of anadromous salmonids in the watershed. Fish habitat in Asotin Creek and other local streams has been affected by agricultural development, grazing, tilling practices, logging, recreational activities and implementation of flood control structures (Neilson 1950). The Asotin Creek Model Watershed Master Plan was completed in 1994. The plan was developed by a landowner steering committee for the Asotin County Conservation District (ACCD), with technical support from various Federal, State and local entities. Actions identified within the plan to improve the Asotin Creek ecosystem fall into four main categories: (1) Stream and Riparian, (2) Forestland, (3) Rangeland, and (4) Cropland. Specific actions to be carried out within the stream and in the riparian area to improve fish habitat were: (1) create more pools, (2) increase the amount of large organic …
Date:
January 2002
Creator:
Bumgarner, Joseph D.
Object Type:
Report
System:
The UNT Digital Library