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Office of Scientific & Technical Information Technical Reports
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460
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203
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112
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106
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67
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64
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42
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34
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27
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15,324 Matching Results
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Volatiles combustion in fluidized beds. Quarterly technical progress report, September 4, 1993--December 3, 1993
The goal of this project is to investigate the conditions in which volatiles will burn within both the dense and freeboard regions of fluidized beds. Experiments using a fluidized bed operated at incipient fluidization will be performed to characterize the effect of particle surface area, initial fuel concentration, and particle type on the inhibition of volatiles within a fluidized bed. The work conducted during the period 4 September, 1993 through 3 December, 1993 is reported in this technical progress report. The experimental work during this time period consists primarily of reactor start-up and data collection. Results of stoichiometric combustion of propane in air at three temperatures and a residence time of approximately 3 s are reported. The results of a detailed chemical kinetic model of propane and methane are reported for the theoretical work for this quarter. These results give further evidence that the inhibition of propane and methane combustion is caused by the sand particles.
Date:
December 31, 1993
Creator:
Hesketh, R. P. & Pendergrass, R. A.
Object Type:
Report
System:
The UNT Digital Library
Volatiles combustion in fluidized beds. Technical progress report, 4 March 1993--3 June 1993
The goal of this project is to investigate the conditions in which volatiles will burn within both the dense and freeboard regions of fluidized beds. Experiments using a fluidized bed operated at incipient fluidization will be performed to characterize the effect of particle surface area, initial fuel concentration, and particle type on the inhibition of volatiles within a fluidized bed. The work conducted during the period 4 March, 1993 through 3 June, 1993 is reported in this technical progress report. The work during this time period consists primarily of the startup and trouble shooting of the fluidized bed reactor and gas phase modeling of methane and propane.
Date:
September 1, 1993
Creator:
Hesketh, R. P.
Object Type:
Report
System:
The UNT Digital Library
Volatiles combustion in fluidized beds. Technical progress report, December 1992--February 1993
The goal of this project is to investigate the conditions in which volatiles will burn within both the dense and freeboard regions of fluidized beds. Experiments using a fluidized bed operated at incipient fluidization will be performed to characterize the effect of particle surface area, initial fuel concentration, and particle type on the inhibition of volatiles within a fluidized bed. The work conducted during the period 4 December, 1992 through 3 March, 1993 is reported in this technical progress report. The work during this time period consists primarily of constructing the fluidized bed reactor and some preliminary modeling. The feed into the flow reactor is a mixture of compressed air, nitrogen, and fuel gas. These gases are preheated to between 400 and 500{degrees}C.
Date:
July 1, 1993
Creator:
Hesketh, R. P.
Object Type:
Report
System:
The UNT Digital Library
Volcanology and volcanic activity with a primary focus on potential hazard impacts for the Hawaii geothermal project
This annotated bibliography reviews published references about potential volcanic hazards on the Island of Hawaii that are pertinent to drilling and operating geothermal wells. The first two sections of this annotated bibliography list the most important publications that describe eruptions of Kilauea volcano, with special emphasis on activity in and near the designated geothermal subzones. References about historic eruptions from Mauna Loa`s northeast rift zone, as well as the most recent activity on the southern flank of dormant Mauna Kea, adjacent to the Humu`ula Saddle are described. The last section of this annotated bibliography lists the most important publications that describe and analyze deformations of the surface of Kilauea and Mauna Loa volcanoes.
Date:
October 1, 1993
Creator:
Moore, R. B.; Delaney, P. T. & Kauahikaua, J. P.
Object Type:
Report
System:
The UNT Digital Library
Volume H[sup [minus]] ion source development at LAMPF
One method of increasing the intensity of the LAMPF proton Storage Ring is to use a brighter H[sup [minus]] ion source. To develop such a source, the performance of the small LBL dipole filter and the BNL toroidal filter volume H[sup [minus]] sources are being investigated. Results of testing a new high-duty-factor design of the BNL toroidal filter volume source are discussed. Results of experiments to reduce the electron to H[sup [minus]] ratio and modulate the beam intensity in the small LBL source are presented.
Date:
January 1, 1993
Creator:
York, R.L.; Tupa, D.; Swenson, D.R. & Damjanovich, R.
Object Type:
Article
System:
The UNT Digital Library
Volume H{sup {minus}} ion source development at LAMPF
One method of increasing the intensity of the LAMPF proton Storage Ring is to use a brighter H{sup {minus}} ion source. To develop such a source, the performance of the small LBL dipole filter and the BNL toroidal filter volume H{sup {minus}} sources are being investigated. Results of testing a new high-duty-factor design of the BNL toroidal filter volume source are discussed. Results of experiments to reduce the electron to H{sup {minus}} ratio and modulate the beam intensity in the small LBL source are presented.
Date:
June 1, 1993
Creator:
York, R. L.; Tupa, D.; Swenson, D. R. & Damjanovich, R.
Object Type:
Article
System:
The UNT Digital Library
Volunteer Dimensions, August 1993
Monthly newsletter of the Texas Department of Mental Health and Mental Retardation, discussing topics related to managing volunteers in TXMHMR facilities.
Date:
August 1993
Creator:
Texas. Department of Mental Health and Mental Retardation.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Volunteer Dimensions, November 1993
Monthly newsletter of the Texas Department of Mental Health and Mental Retardation, discussing topics related to managing volunteers in TXMHMR facilities.
Date:
November 1993
Creator:
Texas. Department of Mental Health and Mental Retardation.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Volunteer Dimensions, October 1993
Monthly newsletter of the Texas Department of Mental Health and Mental Retardation, discussing topics related to managing volunteers in TXMHMR facilities.
Date:
October 1993
Creator:
Texas. Department of Mental Health and Mental Retardation.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Volunteer Dimensions, September 1993
Monthly newsletter discussing various ideas for managing volunteers and volunteer programs.
Date:
September 1993
Creator:
Texas. Department of Mental Health and Mental Retardation. Community Relations Office.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Vortex diode jet performance and theory
Fluidics is the technology dealing with the use of a flowing liquid or gas in various devices for controls and fluid transfers. Existing fluidic technology transfers fluid at approximately the same rate as air lifts and jets. A vortex diode combined in parallel with a jet (vortex diode jet) produces significantly higher transfer rates` and retains the fluidic system advantages. This paper presents the proof of concept research and gives design parameters for the vortex diode jet. The goal of this research was to develop a vortex diode jet that would improve fluidic system transfer rates, and to develop and verify the,design equations. Proven design equations could then be used to design, and model vortex diode jet systems. This research has shown that vortex diode jets improve fluidic system transfer rate by up to 60 percent and can be modelled with the design equations.
Date:
December 1, 1993
Creator:
Houck, E. D.
Object Type:
Report
System:
The UNT Digital Library
Vortex dynamics and correlated disorder in high-{Tc} superconductors
We develop a theory for the vortex motion in the presence of correlated disorder in the form of the twin boundaries and columnar defects. Mapping vortex trajectories onto boson world lines enables us to establish the duality of the vortex transport in the systems with correlated disorder and hopping conductivity of charged particles in 2D systems. A glassy-like dynamics of the vortex lines with zero linear-resistivity and strongly nonlinear current-voltage behavior as V {proportional_to} exp[{minus} const/J{sup {mu}}] in a Bose glass state is predicted.
Date:
August 1, 1993
Creator:
Vinokur, V. M.
Object Type:
Report
System:
The UNT Digital Library
Vortex methods
Vortex methods originated from the observation that in incompressible inviscid flow vorticity (or, more accurately, circulation) is a conserved quantity, as can be readily deduced from the absence of tangential stresses. Thus, if the vorticity is known at time t=0, one can find the flow at a later time by simply following the vorticity. In this narrow context, a vortex method is a numerical method that follows vorticity. The author restricts himself in these lectures to a special class of numerical vortex methods, those that are based on a Lagrangian transport of vorticity in hydrodynamics by smoothed particles (blobs) and those whose analysis contributes to the understanding of blob methods. Blob methods started in the 1930`s.
Date:
June 1, 1993
Creator:
Chorin, A. J.
Object Type:
Article
System:
The UNT Digital Library
Vortex methods and vortex statistics
Vortex methods originated from the observation that in incompressible, inviscid, isentropic flow vorticity (or, more accurately, circulation) is a conserved quantity, as can be readily deduced from the absence of tangential stresses. Thus if the vorticity is known at time t = 0, one can deduce the flow at a later time by simply following it around. In this narrow context, a vortex method is a numerical method that makes use of this observation. Even more generally, the analysis of vortex methods leads, to problems that are closely related to problems in quantum physics and field theory, as well as in harmonic analysis. A broad enough definition of vortex methods ends up by encompassing much of science. Even the purely computational aspects of vortex methods encompass a range of ideas for which vorticity may not be the best unifying theme. The author restricts himself in these lectures to a special class of numerical vortex methods, those that are based on a Lagrangian transport of vorticity in hydrodynamics by smoothed particles (``blobs``) and those whose understanding contributes to the understanding of blob methods. Vortex methods for inviscid flow lead to systems of ordinary differential equations that can be readily clothed in …
Date:
May 1, 1993
Creator:
Chorin, A. J.
Object Type:
Article
System:
The UNT Digital Library
Voth 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:
1993
Creator:
Geological Survey (U.S.)
Object Type:
Map
System:
The Portal to Texas History
Vugraph presentations of the fourth DOE Industry/University/Lab Forum on Robotics for Environmental Restoration and Waste Management
This document is a compilation of various presentations from the Fourth DOE Industry/University/Lab Forum on Robotics for Environmental Restoration and Waste Management held in Albuquerque, New Mexico July 19--21, 1993. Separate abstracts were prepared for each presentation of this report.
Date:
October 1, 1993
Creator:
unknown
Object Type:
Article
System:
The UNT Digital Library
Vulnerability assessment using two complementary analysis tools
To analyze the vulnerability of nuclear materials to theft or sabotage, Department of Energy facilities have been using, since 1989, a computer program called ASSESS, Analytic System and Software for Evaluation of Safeguards and Security. During the past year Sandia National Laboratories has begun using an additional program, SEES, Security Exercise Evaluation Simulation, enhancing the picture of vulnerability beyond what either program achieves alone. Assess analyzes all possible paths of attack on a target and, assuming that an attack occurs, ranks them by the probability that a response force of adequate size can interrupt the attack before theft or sabotage is accomplished. A Neutralization module pits, collectively, a security force against the interrupted adversary force in a fire fight and calculates the probability that the adversaries are defeated. SEES examines a single scenario and simulates in detail the interactions among all combatants. its output includes shots fired between shooter and target, and the hits and kills. Whereas ASSESS gives breadth of analysis, expressed statistically and performed relatively quickly, SEES adds depth of detail, modeling tactical behavior. ASSESS finds scenarios that exploit the greatest weakness of a facility. SEES explores these scenarios to demonstrate in detail how various tactics to nullify …
Date:
July 1, 1993
Creator:
Paulus, W. K.
Object Type:
Article
System:
The UNT Digital Library
Vulnerability Assessment Using Two Complementary Analysis Tools
To analyze the vulnerability of nuclear materials to theft or sabotage, Department of Energy facilities have been using, since 1989, a computer program called ASSESS, Analytic System and Software for Evaluation of Safeguards and Security. During the past year Sandia National Laboratories has began using an additional program, SEES, Security Exercise Evaluation Simulation, enhancing the picture of vulnerability beyond what either program achieves alone. ASSESS analyzes all possible paths of attack on a target and, assuming that an attack occurs, ranks them by the probability that a response force of adequate size can interrupt the attack before theft or sabotage is accomplished. A Neutralization module pits, collectively, a security force against the interrupted adversary force in a fire fight and calculates the probability that the adversaries are defeated. SEES examines a single scenario and simulates in detail the interactions among all combatants. Its output includes shots fired between shooter and target, and the hits and kills. Whereas ASSESS gives breadth of analysis, expressed statistically and performed relatively quickly, SEES adds depth of detail, modeling tactical behavior. ASSESS finds scenarios that exploit the greatest weaknesses of a facility. SEES explores these scenarios to demonstrate in detail how various tactics to nullify …
Date:
July 1, 1993
Creator:
Paulus, William K.
Object Type:
Article
System:
The UNT Digital Library
Vulnerability of hot LX-17 to lightning strikes on exposed detonator and actuator cables
Capacitor bank discharges with peak currents up to 700 kA were used to explode test sections of detonator cable and launch the dielectric material on top of the exploding conductor as a fast flyer plate. Velocity of the launched material, pressure profiles from the impact of the launched material and impact marks formed in aluminum witness plates were used to study the stimulus that could be transmitted to high explosive in the vicinity of the exploding cable. To quantify the risk of initiating the main charge or booster insensitive high explosive (IHE) in a weapon, one must know the threshold stimulus required for shock initiation. LX-17 samples, heated to temperatures up to 250C were impacted by 3 to 10-mm-wide stripes of 0.12-mm-thick Kapton to determine the initiation threshold velocity at ambient and elevated temperatures, The strips simulate the impact of the cover coat of a flat detonator cable which has been exploded by a lighting strike. The data allow us to assess the likelihood that a lightning strike on the cable would be able to initiate a detonation of the LX- 17 main charge.
Date:
December 1, 1993
Creator:
Chau, H. H.; Osher, J. E.; Von Holle, W. G.; Lee, R. S. & Moua, K.
Object Type:
Report
System:
The UNT Digital Library
VVER-440 dosimetry and neutron spectrum benchmark
Light Water Reactor (LWR) benchmark experiments performed in the United States under the Surveillance Dosimetry Improvement Program (SDIP), in general, reported measured reaction rates and not neutron flux spectrum. The VVER-440 benchmark experiments, using a combination of spherical hydrogen-filled proportional counters and a stilbene scintillator detector, were measurements that provided a direct verification of the transport neutron flux spectrum. The original SAILOR cross-section library from ENDF/B-IV were used, except that the iron, hydrogen, and oxygen values from ENDF/B-VI were inserted. A linear-least-squares analysis showed that the average difference between calculations and measurements below 10 MeV was (a) less than 6% at the surveillance position; (b) less than 5% at the pressure vessel (PV) inner surface; (c) less than 6% at 1/3 thickness into the PV (1/3 T); (d) less than 17% at 2/3 thickness into the PV (2/3 T); and (e) less than 24% at the PV outer surface.
Date:
November 1, 1993
Creator:
Sajot, E. & Kam, F. B. K.
Object Type:
Article
System:
The UNT Digital Library
A VXI-based high speed x-ray CCD detector
For time-resolved x-ray scattering, one ideally wants a high speed detector that also is capable of giving position sensitive information. Charge Coupled Devices (CCDS) have been used successfully as x-ray detectors. Unfortunately, they are inherently slow because of the serial readout EEV has developed a CCD that has eight channels of parallel readout, thus increasing the speed eight fold. Using state-of-the-art VXI electronics, we have developed a readout system that could read the entire array in 2.5 ms using a 20-MHz readout clock. For testing and characterization the device was clocked at a significantly slower speed of 30 kHz. The data is preamplified and all eight channels of output are simultaneously digitized to 12 bits and stored in buffer memory. The system is controlled by a 486-based PC through an MXI bus and VXI controller using commercially available software. The system is also capable of real-time image display and manipulation.
Date:
October 1, 1993
Creator:
Huang, Qiang; Hopf, R. & Rodricks, B.
Object Type:
Article
System:
The UNT Digital Library
VxWorks v5.1 benchmark tests
We measure the performance of the VxWorks Real-time Operating System on various VME single-board computers and compare VxWorks (v5.02) and VxWorks(v5.1).
Date:
May 1, 1993
Creator:
Botlo, M.; Jagielski, M. & Romero, A.
Object Type:
Report
System:
The UNT Digital Library
W{sup {plus_minus}} and Z{sup 0} event rates and background estimates for the STAR detector at RHIC in pp collisions
The estimates for W{sup {plus_minus}} and Z{sup 0} production rates and various background contributions in the STAR detector with the barrel electromagnetic calorimeter are presented. These results were obtained by Monte-Carlo simulations with the PYTHIA V5.6/JETSET V7.3 of the LUND set of routines and GEANT V3.15.
Date:
December 1, 1993
Creator:
Rykov, V. L. & Shestermanov, K. E.
Object Type:
Report
System:
The UNT Digital Library
Wabash River Coal Gasification Combined Cycle Repowering Project: Clean Coal Technology Program. Environmental Assessment
The proposed project would result in a combined-cycle power plant with lower emissions and higher efficiency than most existing coal-fired power plants of comparable size. The net plant heat rate (energy content of the fuel input per useable electrical generation output; i.e., Btu/kilowatt hour) for the new repowered unit would be a 21% improvement over the existing unit, while reducing SO{sub 2} emissions by greater than 90% and limiting NO{sub x} emissions by greater than 85% over that produced by conventional coal-fired boilers. The technology, which relies on gasified coal, is capable of producing as much as 25% more electricity from a given amount of coal than today`s conventional coal-burning methods. Besides having the positive environmental benefit of producing less pollutants per unit of power generated, the higher overall efficiency of the proposed CGCC project encourages greater utilization to meet base load requirements in order to realize the associated economic benefits. This greater utilization (i.e., increased capacity factor) of a cleaner operating plant has global environmental benefits in that it is likely that such power would replace power currently being produced by less efficient plants emitting a greater volume of pollutants per unit of power generated.
Date:
May 1, 1993
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library