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20,183 Matching Results
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Thermal Expansion and Phase Inversion of Rare-Earth Oxides
Thermal expansion and phase inversion measurements are reported on oxides of Sc, Y, La, and 12 lanthanide series elements up to 1350 deg C. (J.R.D.)
Date:
October 1, 1960
Creator:
Stecura, S. & Campbell, W.J.
Object Type:
Report
System:
The UNT Digital Library
Modeling of Integrated Environmental Control Systems for Coal-Fired Power Plants Quarterly Report: June-September 1989
The general goal of this research project is to enhance, and transfer to DOE, a new computer simulation model for analyzing the performance and cost of environmental control systems for coal-fired power plants. Systems utilizing pre-combustion, combustion, or post-combustion control methods, individually or in combination, may be considered. A unique capability of this model is the probabilistic representation of uncertainty in model input parameters. This stochastic simulation capability allows the performance and cost of environmental control systems to be quantified probabilistically, accounting for the interactions among all uncertain process and economic parameters. This method facilitates more rigorous comparisons between conventional and advanced clean coal technologies promising improved cost and/or effectiveness for SO{sub 2} and NO{sub x} removal. Detailed modeling of several pre-combustion and post-combustion processes of interest to DOE/PETC have been selected for analysis as part of this project.
Date:
October 1, 1989
Creator:
Rubin, E. S.
Object Type:
Report
System:
The UNT Digital Library
Fixed bed gasification for production of industrial fuel gas
This report summarizes the results of technical and economic evaluations of six commercially available, fixed-bed coal gasification processes for the production of industrial fuel gas. The study was performed for DOE and is intended to assist industrial companies in exploring the feasibility of producing gaseous fuels for both retrofit and new industrial plant situations. The report includes a technical analysis of the physical configuration, performance capabilities, and commercial experiments to-date for both air-blown and oxygen-blown fixed bed gasifiers. The product gas from these gasifiers is analyzed economically for three different degrees of cleanliness: (1) hot raw gas, (2) dust-, tar-, and oil-free gas, and (3) dust-, tar-, oil-free and desulfurized gas. The evaluations indicate that low-Btu gases produced from fixed bed gasifiers constitute one of the most logical short-term solutions for helping ease the shortage of natural gas for industrial fuel applications because the technology is well-proven and has been utilized on a commercial scale for several decades both in this country and overseas; time from initiation of design to commercial operation is about two years; the technology is not complicated to construct, operate, or maintain; and a reliable supply of product gas can be generated on-site. The advantages and …
Date:
October 1, 1977
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Compendium of federal and state radioactive materials transportation laws and regulations: Transportation Legislative Database (TLDB)
The Transportation Legislative Database (TLDB) is an on-line information service containing detailed information on legislation and regulations regarding the transportation of radioactive materials in the United States. The system is dedicated to serving the legislative and regulatory information needs of the US Department of Energy and other federal agencies; state, tribal, and local governments; the hazardous materials transportation industry; and interested members of the general public. In addition to the on-line information service, quarterly and annual Legal Developments Reports are produced using information from the TLDB. These reports summarize important changes in federal and state legislation, regulations, administrative agency rulings, and judicial decisions over the reporting period. Information on significant legal developments at the tribal and local levels is also included on an as-available basis. Battelle's Office of Transportation Systems and Planning (OTSP) will also perform customized searches of the TLDB and produce formatted printouts in response to specific information requests.
Date:
October 1, 1989
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Temperature control system for liquid-fed ceramic melters
A temperature-feedback system has been developed for controlling electrical power to liquid-fed ceramic melters (LFCM). Software, written for a microcomputer-based data acquisition and process monitoring system, compares glass temperatures with a temperature setpoint and adjusts the electrical power accordingly. Included in the control algorithm are steps to reject failed thermocouples, spatially average the glass temperatures, smooth the averaged temperatures over time using a digital filter, and detect foaming in the glass. The temperature control system has proved effective during all phases of melter operation including startup, steady operation, loss of feed, and shutdown. This system replaces current, power, and resistance feedback control systems used previously in controlling the LFCM process.
Date:
October 1, 1986
Creator:
Westsik, J. H. Jr.
Object Type:
Report
System:
The UNT Digital Library
Data telecommunications at the CSCF
At Brookhaven National Laboratory data telecommunication for remote job entry, interactive time sharing, networking, graphics, and special purpose links became increasingly important--they now rival the more traditional over-the-counter traffic. The BNL Central Scientific Computing Facility (CSCF) responded to this need with a number of developments. The latest and most comprehensive of these is a ''front-end'' communications system built around MODCOMP II computers. To put this project into its proper framework, some historical background is presented describing predecessor systems, the development of specifications, and the factors considered in the decision to turn to MODCOMP. The hardware is based around dual MODCOMP II-233 processors with a specially developed link to the larger CSCF machines, two Control Data 6600 computers and one CDC 7600. The MODCOMP software is based upon an existing system developed by Chrysler Corporation, running under MAXCOM. On the Control Data side Scope 3.4/INTERCOM 4 is used as a basis. The developments and modifications, both hardware and software, necessary for these components to meet Brookhaven's specifications are described. Certain related special-purpose data link applications are described. Among them are a research project in national resource sharing networks using ARPANET, and a connection to the National Weather Service machines in Suitland, …
Date:
October 1, 1977
Creator:
Peskin, A. M.
Object Type:
Article
System:
The UNT Digital Library
A Simulation of the EGCR Steam Generator
An analog model of the EGCR steam generator was developed and operated on the ORNL analog computer as part of a program to simulate the operation and control of the EGCR reactor plant. Equilibrium operation and the transient response of the steam generator unit to system perturbations were studied. A simultaneous solution of the basic heat transfer equations representing the performance of the unit was obtained. The model was operated initially at steady- state conditions, and then perturbations were made to gas flow, gas inlet temperature, and steam throttle valve position. The response characteristics of the model during the transients were recorded. The steam generator gas outlet temperature showed a marked degree of insensitivity to changes in gas inlet temperature. The effect of gas flow changes on gas exit temperature was slightly more pronounced. The transient behavio-r of the unit was reasonable, and the model developed indicated satisfactory operation within the design range of 20 to l00% of full power. (auth)
Date:
October 1, 1961
Creator:
Yarosh, M.M. & Ball, S.J.
Object Type:
Report
System:
The UNT Digital Library
Conventional magnet storage rings for x-ray lithography
A first pass at the design of a conventional magnet storage ring for x-ray lithogrphy is presented. Electron beam size and power specifications are given, followed by a first pass at a lattice - a 4-fold symmetric, gradient FODO cell lattice using B = 1.6 Tesla C-magnets. (LEW)
Date:
October 1, 1986
Creator:
Bassetti, M.; Batchelor, K.; Galayda, J.; Halama, H.; Heese, R.; Hsieh, H. et al.
Object Type:
Report
System:
The UNT Digital Library
A Broad View of Model Validation
The safety assessment of a nuclear waste repository requires the use of models. Such models need to be validated to ensure, as much as possible, that they are a good representation of the actual processes occurring in the real system. In this paper we attempt to take a broad view by reviewing step by step the modeling process and bringing out the need to validating every step of this process. This model validation includes not only comparison of modeling results with data from selected experiments, but also evaluation of procedures for the construction of conceptual models and calculational models as well as methodologies for studying data and parameter correlation. The need for advancing basic scientific knowledge in related fields, for multiple assessment groups, and for presenting our modeling efforts in open literature to public scrutiny is also emphasized. 16 refs.
Date:
October 1, 1989
Creator:
Tsang, C. F.
Object Type:
Article
System:
The UNT Digital Library
NASA/DOE advanced thermionic technology program. Progress report No. 28
Surface studies of thermionic emitters and collectors in the surface characterization chamber are described. Plasma studies including converter theory, experimental plasma analyses, and enhanced mode conversion experiments are discussed. Progress in thermionic converter development, the component hardware program, and the combustion-heated thermionic device program are outlined. (WHK)
Date:
October 1, 1977
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Hanford Waste Vitrification Plant
The Hanford Waste Vitrification Plant (HWVP) is being designed to immobilize pretreated Hanford high-level waste and transuranic waste in borosilicate glass contained in stainless steel canisters. Testing is being conducted in the HWVP Technology Development Project to ensure that adapted technologies are applicable to the candidate Hanford wastes and to generate information for waste form qualification. Empirical modeling is being conducted to define a glass composition range consistent with process and waste form qualification requirements. Laboratory studies are conducted to determine process stream properties, characterize the redox chemistry of the melter feed as a basis for controlling melt foaming and evaluate zeolite sorption materials for process waste treatment. Pilot-scale tests have been performed with simulated melter feed to access filtration for solids removal from process wastes, evaluate vitrification process performance and assess offgas equipment performance. Process equipment construction materials are being selected based on literature review, corrosion testing, and performance in pilot-scale testing. 3 figs., 6 tabs.
Date:
October 1, 1991
Creator:
Larson, D. E.; Allen, C. R. (Pacific Northwest Lab., Richland, WA (United States)); Kruger, O. L. & Weber, E. T. (Westinghouse Hanford Co., Richland, WA (United States))
Object Type:
Article
System:
The UNT Digital Library
Lead-Glass Wall addition to the Spear Mark I Magnetic Detector
A ''Lead-Glass Wall,'' consisting of 318 lead-glass Cherenkov shower counters and three wire spark chambers, has been added to one octant of the SPEAR Mark I Magnetic Detector. The wall covers a solid angle of approximately 6 percent of 4..pi.. steradians and has been used to identify and measure the energies of electrons and photons produced in electron-positron collisions. The design, calibration, gain-monitoring, and performance of the system are described.
Date:
October 1, 1977
Creator:
Feller, J. M.; Barbaro-Galtieri, A. & Dorfan, J. M.
Object Type:
Article
System:
The UNT Digital Library
Economic Analysis of Replacement Cores for SM and PM Type Reactors
An economic analysis is presented for the fabrication of replacement cores for SM and PM type reactors, including analysis of various core types and core fabrication technologies. The analysis indicates that major savings are possible by utilizing Type 3 cores (40-mil plates, 25 wt% UO/sub 2/, welded assembly) in all SM and PM type reactors, and that significant savings are possible by multiple core procurement and reprocessing, and relaxation of cobalt and tantalum requirements in Type 347 stainless steel. (auth)
Date:
October 1, 1961
Creator:
Wilder, A. S.
Object Type:
Report
System:
The UNT Digital Library
Second-law efficiency of solar-thermal cavity receivers
Properly quantified performance of a solar-thermal cavity receiver must not only account for the energy gains and losses as dictated by the First Law of thermodynamics, but it must also account for the quality of that energy. However, energy quality can only be determined from the Second Law. In this paper an equation for the Second-Law efficiency of a cavity receiver is derived from the definition of available energy or availability (occassionally called exergy), which is a thermodynamic property that measures the maximum amount of work obtainable when a system is allowed to come into unrestrained equilibrium with the surrounding environment. The fundamental concepts of the entropy and availability of radiation are explored from which a convenient relationship among the reflected cone half angle, the insolation, and the concentrator geometric characteristics is developed as part of the derivation of the Second-Law efficiency. A comparison is made between First- and Second-Law efficiencies around an example of data collected from two receivers that were designed for different purposes. The author attempts to demonstrate that a Second-Law approach to quantifying the performance of a solar-thermal cavity receiver lends greater insight into the total performance than does the conventional First-Law method.
Date:
October 1, 1983
Creator:
Moynihan, P. I.
Object Type:
Report
System:
The UNT Digital Library
Sodium Iodide and Sodium Iodide Crystals: Their Use in Scintillation Counting and Spectrometry. A Bibliography
References (297) were obtained from Applied Science and Technology Index, Chemical Abstracts, Dissertations in Physics, Nuclear Science Abstracts, and Science Abstracts, Section A. The period covered was from 1948 through l960. The arrangement is alphabetical by title; personal author and subject indexes are included. (P.C.H.)
Date:
October 1, 1961
Creator:
Kepple, R.R.
Object Type:
Report
System:
The UNT Digital Library
Near-isotropic petroleum-coke based graphites for high temperature gas-cooled reactor core components
The standard covers procurement requirements for extruded graphite logs, 15 in. (381 mm) or greater in diameter, manufactured with near-isotropic petroleum cokes and coal-tar pitch binders which are candidates or reference materials for replaceable fuel and reflector blocks for High-Temperature Gas-Cooled Reactors (HTGRs). The requirements are designed to produce the degree of lot-to-lot reproducibility which is required to ensure consistent and predictable properties and irradiation performance for specific graphite grades and to ensure traceability of the graphite logs to production processes and raw materials that affect performance. The standard is intended for use in the procurement of developmental and commercial grades of nuclear graphite which are to be evaluated on Department of Energy (DOE) funded programs for use as core components in HTGRs.
Date:
October 1, 1977
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Confinement scaling and ignition in tokamaks
A drift wave turbulence model is used to compute the scaling and magnitude of central electron temperature and confinement time of tokamak plasmas. The results are in accord with experiment. Application to ignition experiments shows that high density (1 to 2) . 10/sup 15/ cm/sup -3/, high field, B/sub T/ > 10 T, but low temperature T approx. 6 keV constitute the optimum path to ignition.
Date:
October 1, 1985
Creator:
Perkins, F.W. & Sun, Y.C.
Object Type:
Report
System:
The UNT Digital Library
The new definitive map of White Oak Lake
A map of White Oak Lake was drawn from points on the shoreline established with the use of an electronic distance-measuring theodolite and a hand-held reflecting prism. Average water depths were determined along six transects. A planimeter was used to estimate the area of each section. The volume of each section was determined by multiplying the surface area by the average depth. The total area and volume of White Oak Lake were estimated to be 6.88 ha (17.0 acres) and 43,893 m{sup 3}(1,546,330 ft{sup 3}), respectively. The lake's surface area has been reduced at an average rate of 0.7% per year, and its volume has been reduced at an average rate of 1.1% per year. The volume of the lake can be reliably estimated only from current depth measurements throughout the lake, not from stage heights at the dam. The lake should be remapped periodically, and an estimate of the sediment volume should be made. 6 refs., 3 figs., 1 tab.
Date:
October 1, 1991
Creator:
Cox, D. K.; Farrow, N. D.; Kyker, W. C.; Faulkner, M. A. & Stubbs, L. M.
Object Type:
Report
System:
The UNT Digital Library
Business developments of nonthermal solar technologies
Information on the developments of nonthermal solar technologies is presented. The focus is on the success of wind energy conversion systems (WECS) and photovoltaics. Detailed information on the installed generating capacity, market sectors, financing sources, systems costs and warranties of WECS and photovoltaic systems is summarized. (BCS)
Date:
October 1, 1985
Creator:
Smith, S.A.; Watts, R.L. & Williams, T.A.
Object Type:
Report
System:
The UNT Digital Library
Thermochemical water splitting cycles: oxygen liberating reactions
None
Date:
October 1, 1975
Creator:
Powers, E. J.
Object Type:
Report
System:
The UNT Digital Library
Characterization of the solid, airborne materials created when UF/sub 6/ reacts with moist air flowing in single-pass mode
A series of experiments has been performed in which UF/sub 6/ was released into flowing air in order to characterize the solid particulate material produced under non-static conditions. In two of the experiments, the aerosol was allowed to stagnate in a static chamber after release and examined further but in the other experiments characterization was done only on material collected a few seconds after release. Transmission electron microscopy and mass measurement by cascaded impactor were used to characterize the aerosol particles which were usually single spheroids with little agglomeration in evidence. The goal of the work is to determine the chemistry and physics of the UF/sub 6/-atmospheric moisture reaction under a variety of conditions so that information about resulting species and product morphologies is available for containment and removal (knockdown) studies as well as for dispersion plume modeling and toxicology studies. This report completes the milestone for reporting the information obtained from releases of UF/sub 6/ into flowing rather than static air. 26 figs., 3 tabs.
Date:
October 1, 1985
Creator:
Pickrell, P. W.
Object Type:
Report
System:
The UNT Digital Library
Formal analysis of name accessing in programming languages. [R]
None
Date:
October 1, 1975
Creator:
Smith, C. L.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Performance of the short-pulse oscillators for Argus and Shiva
The large Nd:glass laser-fusion systems, such as Argus and Shiva, require short-pulse oscillators that are very reliable and predictable. The requirements go well beyond what can reasonably be expected from a passively mode-locked laser. An actively mode-locked and Q-switched oscillator has now been developed that is extremely reliable and predictable, and satisfies all the requirements for the present Nd:glass laser systems. These systems require pulses that are adjustable from less than 100 ps to more than 1 ns, with less than 5% shot-to-shot variation in pulse energy and pulse width. Single-pulse energy from 100 ..mu..J to 1 mJ is sufficient. In this paper we will describe the principle of operation of this short-pulse oscillator, describe the Argus laser configuration, and the results obtained with this oscillator. We will then indicate further developments for the Shiva oscillator and discuss the performance of this laser.
Date:
October 1, 1977
Creator:
Kuizenga, D.J. & Martin, W.E.
Object Type:
Article
System:
The UNT Digital Library
RESEARCH ON THE EFFECTS OF MAGNETIC FIELDS ON THERMIONIC POWER GENERATION. Progress Report No. 1
Research concerned with a theoretical and experimental study of magneto- thermionic power generation is reported. This concept promises a number of advantsges over conventional thermionic generators. Low pressure Cs diodes suffer from an undesirable size limitation, because selfinduced magnetic fields reduce current transmission and hence, efficiency. Although this effect does not arise in the small devices tested to date, it becomes important in building larger generators. Analysis indicates that this problem can be virtually eliminnted by the application of a longitudinal magnetic field. An experimental and theoretical study was initiated to verify the predicted magnetic field effects, and to examine their possible use in a-c generation. (auth)
Date:
October 1, 1961
Creator:
Schock, A. & Kunen, A.E.
Object Type:
Report
System:
The UNT Digital Library