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2-D and 3-D computations of curved accelerator magnets
In order to save computer memory, a long accelerator magnet may be computed by treating the long central region and the end regions separately. The dipole magnets for the injector synchrotron of the Advanced Photon Source (APS), now under construction at Argonne National Laboratory (ANL), employ magnet iron consisting of parallel laminations, stacked with a uniform radius of curvature of 33.379 m. Laplace's equation for the magnetic scalar potential has a different form for a straight magnet (x-y coordinates), a magnet with surfaces curved about a common center (r-{theta} coordinates), and a magnet with parallel laminations like the APS injector dipole. Yet pseudo 2-D computations for the three geometries give basically identical results, even for a much more strongly curved magnet. Hence 2-D (x-y) computations of the central region and 3-D computations of the end regions can be combined to determine the overall magnetic behavior of the magnets. 1 ref., 6 figs.
Date:
January 1, 1991
Creator:
Turner, L. R.
Object Type:
Article
System:
The UNT Digital Library
9-1-1 Caller, Volume 3, Number 1, January/February 1991
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:
January 1991
Creator:
Texas. Advisory Commission on State Emergency Communications.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
40- angstrom FEL designs for the PEP storage ring
We explore the use of the 2.2-km PEP storage ring at SLAC to drive a 40-{Angstrom} free-electron laser in the self-amplified spontaneous emission configuration. Various combinations for electron-beam and undulator parameters, as well as special undulator designs, are discussed. Saturation and high peak, in-band, coherent power (460 MW) are possible with a 67-m, hybrid permanent-magnet undulator in a ring bypass. A 100-m, cusp-field undulator can achieve high average, in-band, coherent power (0.25 W) in the main ring. The existing, 25.6-m, Paladin undulator at LLNL, with the addition of optical-klystron dispersive sections, is considered for both peak and average power. 35 refs., 4 figs., 1 tab.
Date:
January 1, 1991
Creator:
Fisher, A. S.; Gallardo, J. C. (Brookhaven National Lab., Upton, NY (United States)); Nuhn, H. D.; Tatchyn, R.; Winick, H. (Stanford Univ., CA (United States). Stanford Synchrotron Radiation Lab.) & Pellegrini, C. (California Univ., Los Angeles, CA (United States). Dept. of Physics)
Object Type:
Article
System:
The UNT Digital Library
65 Minutes, January-February 1991
Bimonthly newsletter of Denton Boy Scout Troop 65 containing a list of upcoming events, news and announcements, and other information for members.
Date:
January 1991
Creator:
Boy Scouts of America. Troop 65 (Denton, Tex.)
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
180 MW demonstration of advanced tangentially-fired combustion techniques for the reduction of nitrogen oxide (NO sub x ) emissions from coal-fired boilers
ABB CE's Low NOx Bulk Furnace Staging (LNBFS) System and Low NOx Concentric Firing System (LNCFS) are demonstrated in stepwise fashion. These systems incorporate the concept of advanced overfire air (AOFA), clustered coal nozzles, and offset air. A complete description of the installed technologies is provided in the following section. The primary objective of the Plant Lansing Smith demonstration is to determine the long-term effects of commercially available tangentially-fired low NOx combustion technologies on NOx emissions and boiler performance. Short-term tests of each technology are also being performed to provide engineering information about emissions and performance trends. A target of achieving fifty percent NOx reduction using combustion modifications has been established for the project.
Date:
January 1, 1991
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
15th Street News (Midwest City, Okla.), Vol. 19, No. 15, Ed. 1 Friday, January 18, 1991
Newspaper from Rose State College in Midwest City, Oklahoma that includes national, local, and campus news along with advertising.
Date:
January 18, 1991
Creator:
Garland, S. E.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
1989 Walker Branch Watershed Surveying and Mapping Including a Guide to Coordinate Transformation Procedures
Walker Branch Watershed is a forested, research watershed marked throughout by a 264 ft grid that was surveyed in 1967 using the Oak Ridge National Laboratory (X-10) coordinate system. The Tennessee Valley Authority (TVA) prepared a contour map of the watershed in 1987, and an ARC/INFO{trademark} version of the TVA topographic map with the X-10 grid superimposed has since been used as the primary geographic information system (GIS) data base for the watershed. However, because of inaccuracies observed in mapped locations of some grid markers and permanent research plots, portions of the watershed were resurveyed in 1989 and an extensive investigation of the coordinates used in creating both the TVA map and ARC/INFO data base and of coordinate transformation procedures currently in use on the Oak Ridge Reservation was conducted. They determined that the positional errors resulted from the field orientation of the blazed grid rather than problems in mapmaking. In resurveying the watershed, previously surveyed control points were located or noted as missing, and 25 new control points along the perimeter roads were surveyed. In addition, 67 of 156 grid line intersections (pegs) were physically located and their positions relative to mapped landmarks were recorded. As a result, coordinates …
Date:
January 1, 1991
Creator:
Timmins, S.
Object Type:
Report
System:
The UNT Digital Library
The 1990 Clean Air Act Amendments and the Great Lakes Economy: Challenges and Opportunities
This paper deals with the market for SO{sub 2} emission allowances over time and electric utility compliance choices. For currently high emitting plants ( > 2.5 lb SO{sub 2}/MMBtu), the 1990 Clean Air Act Amendments (CAAA) provide for about twice as many SO{sub 2} allowances to be issued per year in Phase 1 (1995--1999) than in Phase 2. Also, considering the scrubber incentives in Phase 1, there is likely to be substantial emission banking for use in Phase 2. Allowance prices are expected to increase over time at a rate less than the return on alternative investments, so utilities which are risk neutral or other potential speculators in the allowance market are not expected to bank allowances. The allowances will be banked by risk averse utilities or the utilities may buy forward contracts for SO{sub 2} allowances. However, speculators may play an important role by selling forward contracts for SO{sub 2} allowances to the risk averse utilities. The Argonne Utility Simulation Model (ARGUS) is being revised to incorporate the provisions of the CAAA acid rain title and to simulate SO{sub 2} allowance prices, compliance choices, capacity expansion, system dispatch, fuel use, and emissions. The revised model (ARGUS2) incorporates unit-level performance …
Date:
January 1, 1991
Creator:
Hanson, D.; Molburg, J.; Pandola, G.; Taxon, T.; Lurie, G.; Fisher, R. et al.
Object Type:
Article
System:
The UNT Digital Library
1991 Annual report on scientific programs: A broad research program on the sciences of complexity
1991 was continued rapid growth for the Santa Fe Institute (SFI) as it broadened its interdisciplinary research into the organization, evolution and operation of complex systems and sought deeply the principles underlying their dynamic behavior. Research on complex systems--the focus of work at SFI--involves an extraordinary range of topics normally studied in seemingly disparate fields. Natural systems displaying complex behavior range upwards from proteins and DNA through cells and evolutionary systems to human societies. Research models exhibiting complexity include nonlinear equations, spin glasses, cellular automata, genetic algorithms, classifier systems, and an array of other computational models. Some of the major questions facing complex systems researchers are: (1) explaining how complexity arises from the nonlinear interaction of simples components, (2) describing the mechanisms underlying high-level aggregate behavior of complex systems (such as the overt behavior of an organism, the flow of energy in an ecology, the GNP of an economy), and (3) creating a theoretical framework to enable predictions about the likely behavior of such systems in various conditions. The importance of understanding such systems in enormous: many of the most serious challenges facing humanity--e.g., environmental sustainability, economic stability, the control of disease--as well as many of the hardest scientific questions--e.g., …
Date:
January 1, 1991
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
A 1K Shadow RAM for circumvention applications
A 1K bit Shadow RAM has been developed for storage of critical data in a high transient radiation environment. The circuit includes a 1K bit (128 {times} 8) static RAM with two non-volatile (NV) shadows. The NV shadows are used to back-up the data in the static RAM allowing the circuit to be powered down during transient radiation without losing critical data. This paper will describe the circuit's operation and characterization results.
Date:
January 1, 1991
Creator:
Murray, J.R.
Object Type:
Article
System:
The UNT Digital Library
32nd Annual Report
The ACIR Library is composed of publications that study the interactions between different levels of government. This document is an annual report.
Date:
January 1991
Creator:
United States. Advisory Commission on Intergovernmental Relations.
Object Type:
Book
System:
The UNT Digital Library
3d Image Reconstruction for PET by Multi-Slice Rebinning and Axial Filtering. [Positron Emission Tomography (Pet)]
Two different approaches are used at present to reconstruct from 3D coincidence data in PET. We refer to these approaches as the single-slice rebinning approach and the fully-3D approach. The single-slice rebinning approach involves geometrical approximations, but it requires the least possible amount of computation. Fully-3D reconstruction algorithms, both iterative and non-iterative, do not make such approximations, but require much more computation. Multi-slice rebinning with axial filtering is a new approach which attempts to achieve the geometrical accuracy of the fully-3D approach with the simplicity and modest amount of computation of the single-slice rebinning approach. The first step (multi-slice rebinning) involves rebinning of coincidence lines into a stack of 2D sinograms, where multiple sinograms are incremented for each oblique coincidence line. This operation is followed by an axial filtering operation, either before or after slice-by-slice reconstruction, to reduce the blurring in the axial direction. Tests with simulated and experimental data indicate that the new method has better geometrical accuracy than single-slice rebinning, at the cost of only a modest increase in computation. 11 refs.
Date:
January 1, 1991
Creator:
Lewitt, R. M.; Muehllehner, G. & Karp, J. S.
Object Type:
Article
System:
The UNT Digital Library
3D vadose zone modeling using geostatistical inferences
In developing a 3D model of the 600 ft thick interbedded basalt and sediment complex that constitutes the vadose zone at the Radioactive Waste Management Complex (RWMC) at the Idaho National Engineering Laboratory (INEL) geostatistical data were captured for 12--15 parameters (e.g. permeability, porosity, saturation, etc. and flow height, flow width, flow internal zonation, etc.). This two scale data set was generated from studies of subsurface core and geophysical log suites at RWMC and from surface outcrop exposures located at the Box Canyon of the Big Lost River and from Hell's Half Acre lava field all located in the general RWMC area. Based on these currently available data, it is possible to build a 3D stochastic model that utilizes: cumulative distribution functions obtained from the geostatistical data; backstripping and rebuilding of stratigraphic units; an expert'' system that incorporates rules based on expert geologic analysis and experimentally derived geostatistics for providing: (a) a structural and isopach map of each layer, (b) a realization of the flow geometry of each basalt flow unit, and (c) a realization of the internal flow parameters (eg permeability, porosity, and saturation) for each flow. 10 refs., 4 figs., 1 tab.
Date:
January 1, 1991
Creator:
Knutson, C.F. & Lee, C.B.
Object Type:
Article
System:
The UNT Digital Library
[72nd Texas Legislature, Regular Session, Senate Bill, No. 134]
Bill introduced by the Texas Senate relating to establishing Martin Luther King, Jr. Day as a state holiday and changing Confederate Heroes Day to June 3rd.
Date:
January 14, 1991
Creator:
Texas. Legislature. Senate.
Object Type:
Legislative Document
System:
The Portal to Texas History
[72nd Texas Legislature, Regular Session, Senate Bill, No. 134]
Bill introduced by the Texas Senate relating to establishing Martin Luther King, Jr. Day as a state holiday and changing Confederate Heroes Day to June 3rd.
Date:
January 14, 1991
Creator:
Texas. Legislature. Senate.
Object Type:
Legislative Document
System:
The Portal to Texas History
7th DOE workshop on computer-aided engineering
This report contains the abstracts and the program for the 7th DOE workshop on Computer-Aided Engineering. (LSP)
Date:
January 1, 1991
Creator:
unknown
Object Type:
Article
System:
The UNT Digital Library
7th international symposium on photosynthetic prokaryotes
This book contains the abstracts of all the presentations made either in oral or poster form, at the VII International Symposium on Photosynthetic Prokaryotes.
Date:
January 1, 1991
Creator:
Fuller, R.C.
Object Type:
Article
System:
The UNT Digital Library
[8th annual "Black Music and the Civil Rights Movement Concert", tape 1 of 6]
Video recording from The Black Academy of Arts and Letters recorded during the eighth annual Black Music and the Civil Rights Movement Concert in 1991 at the Meyerson Symphony Center in Dallas Texas. The concert featured Cissy Houston and a 200 voice choir. The tape includes the opening of the concert with a large gospel choir singing and swaying to the music followed by two male speakers who speak for the remainder of the tape.
Date:
January 13, 1991
Creator:
unknown
Object Type:
Video
System:
The UNT Digital Library
[8th annual "Black Music and the Civil Rights Movement Concert", tape 4 of 6]
Video footage from The Black Academy of Arts and Letters recorded during the eighth annual Black Music and the Civil Rights Movement Concert in 1991. The concert featured Cissy Houston and choir and was held at the Meyerson Symphony Center in Dallas Texas. The videotape shows Cissy Houston wearing a pink formal dress singing in front of a drum set, piano, and a large gospel choir. The video covers four songs of the concert
Date:
January 13, 1991
Creator:
King, Curtis & Houston, Cissy
Object Type:
Video
System:
The UNT Digital Library
[8th annual "Black Music and the Civil Rights Movement Concert", tape 6 of 6]
Video recording from The Black Academy of Arts and Letters recorded during the eighth annual Black Music and the Civil Rights Movement Concert in 1991 at the Meyerson Symphony Center in Dallas Texas. The concert featured Cissy Houston and a 200 voice choir. The tape includes the ending of the concert with Curtis King giving closing remarks.
Date:
January 13, 1991
Creator:
unknown
Object Type:
Video
System:
The UNT Digital Library
The A.N.L Electrochemical Program for D.O.E. on Electric Vehicle R. & D.
This report summarizes the objectives, background, technical progress, and status of ANL electric vehicle battery R D tasks for DOE-EHP during the period of January 1 through March 31, 1991. The work is organized into the following six task areas: Project management; battery systems technology; lithium/sulfide batteries; advanced sodium/metal chloride battery; aqueous batteries; and EV Battery performance/life evaluation.
Date:
January 1, 1991
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Ab initio quantum chemistry in parallel-portable tools and applications
In common with many of the computational sciences, ab initio chemistry faces computational constraints to which a partial solution is offered by the prospect of highly parallel computers. Ab initio codes are large and complex (O(10{sup 5}) lines of FORTRAN), representing a significant investment of communal effort. The often conflicting requirements of portability and efficiency have been successfully resolved on vector computers by reliance on matrix oriented kernels. This proves inadequate even upon closely-coupled shared-memory parallel machines. We examine the algorithms employed during a typical sequence of calculations. Then we investigate how efficient portable parallel implementations may be derived, including the complex multi-reference singles and doubles configuration interaction algorithm. A portable toolkit, modeled after the Intel iPSC and the ANL-ACRF PARMACS, is developed, using shared memory and TCP/IP sockets. The toolkit is used as an initial platform for programs portable between LANS, Crays and true distributed-memory MIMD machines. Timings are presented. 53 refs., 4 tabs.
Date:
January 1, 1991
Creator:
Harrison, R.J.; Shepard, R. (Argonne National Lab., IL (United States)) & Kendall, R.A. (Battelle Pacific Northwest Lab., Richland, WA (United States))
Object Type:
Report
System:
The UNT Digital Library
[Abilene City Council Minutes: 1991]
Ledger containing minutes of the City Council in Abilene, Texas documenting the group's discussions and activities from January 10, 1991 to December 19, 1991.
Date:
1991-01-10/1991-12-19
Creator:
Abilene (Tex.)
Object Type:
Book
System:
The Portal to Texas History
Ablation of material by front surface spallation
Laser irradiation can be utilized to remove (i.e., ablate) material in a controlled manner by a hydrodynamic process, referred to as front surface spallation. In this process, a thin layer next to a free surface is heated to a level (below vaporization) so rapidly that it cannot undergo thermal expansion during laser heating. This generates a stress pulse, which propagates both inward and toward the free surface, with an initial amplitude that can be calculated using the Grueneisen coefficient. As the pulse reflects from the free surface, a tensile tail can develop of sufficient amplitude, exceeding the material strength, that a layer will be spalled off, taking much of the laser-deposited energy with it. To achieve spallation conditions, the laser wavelength, pulselength and fluence must be tailored to the absorption depth, Grueneisen coefficient, and spall strength. Hydrodynamic calculations and analytical modeling are presented to explain the process and illustrate conditions under which it should be expected to occur. Under some conditions, front surface spallation can have advantages over ablation by thermal vaporization, where residual temperatures are generally higher. 9 refs., 7 figs.
Date:
January 1, 1991
Creator:
Dingus, R. S. & Scammon, R. J.
Object Type:
Article
System:
The UNT Digital Library