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3-D numerical investigation of the mantle dynamics associated with the breakup of Pangea
Three-dimensional finite element calculations in spherical geometry are performed to study the response of the mantle with platelike blocks at its surface to an initial condition corresponding to subduction along the margins of Pangea. The mantle is treated as an infinite Prandtl number Boussinesq fluid inside a spherical shell with isothermal, undeformable, free-slip boundaries. Nonsubducting rigid blocks to model continental lithosphere are included in the topmost layer of the computational mesh. At the beginning of the numerical experiments these blocks represent the present continents mapped to their approximate Pangean positions. Asymmetrical downwelling at the margins of these nonsubducting blocks results in a pattern of stresses that acts to pull the supercontinent apart. The calculations suggest that the breakup of Pangea and the subsequent global pattern of seafloor spreading was driven largely by the subduction at the Pangean margins.
Date:
October 1, 1992
Creator:
Baumgardner, J. R.
Object Type:
Article
System:
The UNT Digital Library
7-GeV Advanced Photon Source Instrumentation Initiative. Conceptual Design Report
In this APS Instrumentation Initiative, 2.5-m-long and 5-m-long insertion-device x-ray sources will be built on 9 straight sections of the APS storage ring, and an additional 9 bending-magnet sources will also be put in use. The front ends for these 18 x-ray sources will be built to contain and safeguard access to these bright x-ray beams. In addition, funds will be provided to build state-of-the-art insertion-device beamlines to meet scientific and technological research demands well into the next century. This new initiative will also include four user laboratory modules and a special laboratory designed to meet the x-ray imaging research needs of the users. The Conceptual Design Report (CDR) for the APS Instrumentation Initiative describes the scope of all the above technical and conventional construction and provides a detailed cost and schedule for these activities. According to these plans, this new initiative begins in FY 1994 and ends in FY 1998. The document also describes the preconstruction R & D plans for the Instrumentation Initiative activities and provides the cost estimates for the required R & D.
Date:
October 1992
Creator:
Argonne National Laboratory
Object Type:
Report
System:
The UNT Digital Library
9-1-1 Caller, Volume 4, Number 5, October/November 1992
Bimonthly newsletter of the Texas Advisory Commission on State Emergency Communications discussing news and activities of the organization as well as other information related to 9-1-1 services and other emergency communication within Texas.
Date:
October 1992
Creator:
Texas. Advisory Commission on State Emergency Communications.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
2727-S Nonradioactive Dangerous Waste Storage Facility Closure Plan. Revision 3A
This report contains Sections 4 and 5 of the Nonradioactive Dangerous Waste Storage Facility Closure Plan, which summarizes closure activities for the site. Sampling procedures for the building, concrete and soils are given. Plans for building disposal, equipment decontamination, site restoration, and providing cost estimates are outlined. Section 5 discusses plans to develop a health and safety contingency plan before initiation of sampling activities.
Date:
October 1, 1992
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
3D-Flow Processor for a Programmable Level-1 Trigger (Feasibility Study)
A feasibility study has been made to use the 3D-Flow processor in a pipelined programmable parallel processing architecture to identify particles such as electrons, jets, muons, etc., in high-energy physics experiments.
Date:
October 1, 1992
Creator:
Crosetto, D.
Object Type:
Report
System:
The UNT Digital Library
Accelerator transmutation of {sup 129}I
Iodine-129 is one of several long-lived reactor products that is being considered for transmutation by the Los Alamos Accelerator Transmutation of Waste (ATW) program. A reasonable rate of transmutation of 1291 is possible in this system because of the anticipated high neutron flux generated from the accelerator. This report summarizes previous papers dealing with the transmutation of 1291 where reactor technologies have been employed for neutron sources. The transmutation process is considered marginal under these conditions. Presented here are additional information concerning the final products that could be formed from the transmutation process in the ATW blanket. The transmutation scheme proposes the use of solid iodine as the target material and the escape of product xenon from the containers after van Dincklange (1981). Additional developmental plans are considered.
Date:
October 1, 1992
Creator:
Attrep, M. Jr.
Object Type:
Article
System:
The UNT Digital Library
Activist Alert: October 1992
October 1992 newsletter of Activist Alert from the NGLTF.
Date:
October 1992
Creator:
National Gay and Lesbian Task Force (U.S.)
Object Type:
Journal/Magazine/Newsletter
System:
The UNT Digital Library
Adaptation of the Minerals Management Service's Oil-Weathering Model for Use in the Gulf of Mexico Region
The Minerals Management Service's open-ocean, oil-weathering model has been updated extensively for use on personal computers to determine what oil-weathering processes are wind and/or temperature dependent. Provides detailed user's instructions on how to use the model, examples demonstrating the model, and program listings.
Date:
October 1992
Creator:
Kirstein, Bruce E.
Object Type:
Text
System:
The UNT Digital Library
An adaptive crystal bender for high power synchrotron radiation beams
Perfect crystal monochromators cannot diffract x-rays efficiently, nor transmit the high source brightness available at synchrotron radiation facilities, unless surface strains within the beam footprint are maintained within a few arcseconds. Insertion devices at existing synchrotron sources already produce x-ray power density levels that can induce surface slope errors of several arcseconds on silicon monochromator crystals at room temperature, no matter how well the crystal is cooled. The power density levels that will be produced by insertion devices at the third-generation sources will be as much as a factor of 100 higher still. One method of restoring ideal x-ray diffraction behavior, while coping with high power levels, involves adaptive compensation of the induced thermal strain field. The design and performance, using the X25 hybrid wiggler beam line at the National Synchrotron Light Source (NSLS), of a silicon crystal bender constructed for this purpose are described.
Date:
October 1, 1992
Creator:
Berman, L. E. & Hastings, J. B.
Object Type:
Article
System:
The UNT Digital Library
Addition of photosensitive dopants to the D0 liquid argon calorimeter
The addition of photosensitive dopants to liquid argon greatly enhances the signal from heavily ionizing particles. Since binding energy losses we correlated with the heavily ionizing component in hadronic showers, the addition of photosensitive dopants has been suggested as a mechanism to tune the e/[pi] ratio in liquid argon calorimeters. A measurement was performed at the FNAL test beam, adding 4 ppM tetramethylgermanium to the D[phi] uranium-liquid argon calorimeter. An increase in response for electromagnetic and hadronic showers was observed, with no net change in the e/[pi] ratio.
Date:
October 1, 1992
Creator:
Amos, N.A. & Anderson, D.F.
Object Type:
Article
System:
The UNT Digital Library
Addition of photosensitive dopants to the D0 liquid argon calorimeter
The addition of photosensitive dopants to liquid argon greatly enhances the signal from heavily ionizing particles. Since binding energy losses we correlated with the heavily ionizing component in hadronic showers, the addition of photosensitive dopants has been suggested as a mechanism to tune the e/{pi} ratio in liquid argon calorimeters. A measurement was performed at the FNAL test beam, adding 4 ppM tetramethylgermanium to the D{phi} uranium-liquid argon calorimeter. An increase in response for electromagnetic and hadronic showers was observed, with no net change in the e/{pi} ratio.
Date:
October 1992
Creator:
Amos, Norman A.; Anderson, David F. & Collaboration, The D0
Object Type:
Article
System:
The UNT Digital Library
Adsorption of a binary gas mixture which laterally interacts on a random heterogeneous surface
Analytical expressions for the adsorption of a binary gas mixture which laterally interacts on a heterogeneous surface are developed. The lateral interactions are of the Bragg-Williams type and the surface heterogeneity is modeled via a random distribution of sites described by a uniform distribution of Henry`s Law constants. The parametric study shows that complex phase behavior can be predicted, including azeotropes and sigmoidal shaped X-Y diagrams. Also, this model may be useful for modeling and designing adsorption processes as it requires few iterations to simultaneously solve the implicit and coupled algebraic expressions.
Date:
October 1, 1992
Creator:
Ritter, J. A.
Object Type:
Article
System:
The UNT Digital Library
An advanced data-acquisition system for wind energy projects
NREL has subcontracted with Zond Systems, Inc. to develop an advanced data-acquisition system (ADAS) for wind energy projects. The ADAS can be used to simplify the process of making accurate measurements and analyzing. The system utilizes state-of-the-art electronics and telemetry to provide distributed multi-source, multi-channel data acquisition. Local stand-alone microprocessor-based data acquisition modules (DAMs) can be located near sources of measurement. These allow analog data values to be digitized close to the measurement source, thus eliminating the need for long data runs and slip rings. Signals from digital sensors and transducers can also be directly input to the local DAMS. A PC-based ground station is used to coordinate data transmission to and from all remote DAMS, display real-time values, archive data sets, and process and analyze results. The system is capable of acquiring synchronized time-series data from sensors and transducers under a variety of test configurations in an operational wind-park environment. Data acquisition needs of the wind industry differ significantly from those of most other technologies. Most conventional system designs do not handle data coming from multiple distributed sources, nor do they provide telemetry or the ability to mesh multiple incoming digital data streams. This paper describes the capabilities of …
Date:
October 1, 1992
Creator:
Simms, D.A. (National Renewable Energy Lab., Golden, CO (United States)) & Cousineau, K.L. (Zond Systems, Inc., Tehachapi, CA (United States))
Object Type:
Article
System:
The UNT Digital Library
Advanced Light Source instrumentation overview
The accelerator instrumentation played a vital role in commissioning the ALS injector accelerator. It helped us to see whether electron dynamics agreed with our theoretical predictions and important beam parameters met the design specifications. It helped us to see where beam losses occurred and why. In this paper we will start with a brief description of the ALS accelerator complex and the expected performance of it. Then we will describe each diagnostics instrument by its construction, operational principle, requirements, and our experiences with it. We will describe the wall current monitor, the scintillator, the Faraday cup, the beam collimator, the beam position monitor, the direct-current current transformer (DCCT), the traveling wave electrodes the Sabersky finger, and other special instruments. Finally, we will go into some detail on how we measured the beam emittances, the closed orbit, and the betatron tunes.
Date:
October 1, 1992
Creator:
Kim, C. H. & Hinkson, J.
Object Type:
Article
System:
The UNT Digital Library
Advanced moisture sensor research and development
During this period, testing of the system continued at the American Fructose (AF) plant in Dimmitt, Texas. Testing at the first two sites (dryer output and dryer input) was completed. Following the testing at the second site, the sensor was returned to the Southwest Research Institute (SwRI) laboratories for modifications and for fitting of the additional components required to allow sampling of the material to be measured at the third site. These modifications were completed during this reporting period, and the system is scheduled to be installed at the third site (Rotary Vacuum Filter output) early in the next period. Laboratory measurements of corn germ (to be measured at the fourth site) and a variety of fruits and vegetables (one of which will be measured at the fifth site) have also continued during this period.
Date:
October 31, 1992
Creator:
De Los Santos, A.
Object Type:
Report
System:
The UNT Digital Library
Advanced moisture sensor research and development. Quarterly progress report, August 1, 1992--October 31, 1992
During this period, testing of the system continued at the American Fructose (AF) plant in Dimmitt, Texas. Testing at the first two sites (dryer output and dryer input) was completed. Following the testing at the second site, the sensor was returned to the Southwest Research Institute (SwRI) laboratories for modifications and for fitting of the additional components required to allow sampling of the material to be measured at the third site. These modifications were completed during this reporting period, and the system is scheduled to be installed at the third site (Rotary Vacuum Filter output) early in the next period. Laboratory measurements of corn germ (to be measured at the fourth site) and a variety of fruits and vegetables (one of which will be measured at the fifth site) have also continued during this period.
Date:
October 31, 1992
Creator:
De Los Santos, A.
Object Type:
Report
System:
The UNT Digital Library
Advanced separation technology for flue gas cleanup. [Hollow fiber contactors]
The objective of this work is to develop a novel system for regenerable S0[sub 2] and NO. scrubbing of flue gas that focuses on (a) a novel method for regeneration of spent S0[sub 2] scrubbing liquor and (b) novel chemistry for reversible absorption of NO[sub x]. In addition, high efficiency hollow fiber contactors (HFC) are proposed as die devices for scrubbing the S0[sub 2] and NO[sub x] from the flue gas. The system will be designed to remove more than 95% of the SO[sub x] and more than 75% of the NO[sub x] from flue gases typical of pulverized coal-fired power plants at a cost that is at least 20% less than combined wet limestone scrubbing of SO[sub x] and selective catalytic reduction of NO[sub x]. In addition, the process will make only marketable byproducts, if any (no waste streams). The major cost item in existing technology is capital investment therefore, our approach is to reduce the capital cost by using high efficiency hollow fiber devices for absorbing and desorbing the SO[sub 2] and NO[sub x]. We will also introduce new process chemistry to minimize traditionally well-known problems with SO[sub 2] and NO[sub x] absorption and desorption. For example, we …
Date:
October 1, 1992
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Advanced Separation Technology for Flue Gas Cleanup. Quarterly Technical Report No. 2
The objective of this work is to develop a novel system for regenerable S0{sub 2} and NO. scrubbing of flue gas that focuses on (a) a novel method for regeneration of spent S0{sub 2} scrubbing liquor and (b) novel chemistry for reversible absorption of NO{sub x}. In addition, high efficiency hollow fiber contactors (HFC) are proposed as die devices for scrubbing the S0{sub 2} and NO{sub x} from the flue gas. The system will be designed to remove more than 95% of the SO{sub x} and more than 75% of the NO{sub x} from flue gases typical of pulverized coal-fired power plants at a cost that is at least 20% less than combined wet limestone scrubbing of SO{sub x} and selective catalytic reduction of NO{sub x}. In addition, the process will make only marketable byproducts, if any (no waste streams). The major cost item in existing technology is capital investment therefore, our approach is to reduce the capital cost by using high efficiency hollow fiber devices for absorbing and desorbing the SO{sub 2} and NO{sub x}. We will also introduce new process chemistry to minimize traditionally well-known problems with SO{sub 2} and NO{sub x} absorption and desorption. For example, we …
Date:
October 1, 1992
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Advanced sequenching technology. Second year progress report
This progress report briefly describes the laboratory`s advances in chemiluminescent detectors for sequencing DNA, sequence reading algorithm, and for automation of sequencing.(DT)
Date:
October 1, 1992
Creator:
Gesteland, R. F.
Object Type:
Report
System:
The UNT Digital Library
Advanced technology options for industrial heating equipment research
This document presents a strategy for a comprehensive program plan that is applicable to the Combustion Equipment Program of the DOE Office of Industrial Technologies (the program). The program seeks to develop improved heating equipment and advanced control techniques which, by improvements in combustion and beat transfer, will increase energy-use efficiency and productivity in industrial processes and allow the preferred use of abundant, low grade and waste domestic fuels. While the plan development strategy endeavors to be consistent with the programmatic goals and policies of the office, it is primarily governed by the needs and concerns of the US heating equipment industry. The program, by nature, focuses on energy intensive industrial processes. According to the DOE Manufacturing Energy Consumption Survey (MECS), the industrial sector in the US consumed about 21 quads of energy in 1988 in the form of coal, petroleum, natural gas and electricity. This energy was used as fuels for industrial boilers and furnaces, for agricultural uses, for construction, as feedstocks for chemicals and plastics, and for steel, mining, motors, engines and other industrial use over 75 percent of this energy was consumed to provide heat and power for manufacturing industries. The largest consumers of fuel energy were …
Date:
October 1, 1992
Creator:
Jain, R.C.
Object Type:
Report
System:
The UNT Digital Library
[Advocacy Strategies for Educational Transformation]
A detailed letter that illuminates the dynamic ideas and strategic approaches discussed for advocacy efforts with school board members and legislators.
Date:
October 7, 1992
Creator:
unknown
Object Type:
Letter
System:
The UNT Digital Library
Aerosol particle analysis by Raman scattering technique
Laser Raman spectroscopy is a very versatile tool for chemical characterization of micron-sized particles. Such particles are abundant in nature, and in numerous energy-related processes. In order to elucidate the formation mechanisms and understand the subsequent chemical transformation under a variety of reaction conditions, it is imperative to develop analytical measurement techniques for in situ monitoring of these suspended particles. In this report, we outline our recent work on spontaneous Raman, resonance Raman and non-linear Raman scattering as a novel technique for chemical analysis of aerosol particles as well as supersaturated solution droplets.
Date:
October 1, 1992
Creator:
Fung, K.H. & Tang, I.N.
Object Type:
Article
System:
The UNT Digital Library
Aerosol particle analysis by Raman scattering technique
Laser Raman spectroscopy is a very versatile tool for chemical characterization of micron-sized particles. Such particles are abundant in nature, and in numerous energy-related processes. In order to elucidate the formation mechanisms and understand the subsequent chemical transformation under a variety of reaction conditions, it is imperative to develop analytical measurement techniques for in situ monitoring of these suspended particles. In this report, we outline our recent work on spontaneous Raman, resonance Raman and non-linear Raman scattering as a novel technique for chemical analysis of aerosol particles as well as supersaturated solution droplets.
Date:
October 1, 1992
Creator:
Fung, K. H. & Tang, I. N.
Object Type:
Article
System:
The UNT Digital Library
The Age, Volume [13], Number 10, October 1992
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:
October 1992
Creator:
Wallisville Heritage Park (Organization)
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History