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1,366 Matching Results
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Advanced development of a pressurized ash agglomerating fluidized-bed coal gasification system. Fourth quarter progress report, July 1-September 30, 1982
The overall objective of the Westinghouse coal gasification program is to demonstrate the viability of the Westinghouse pressurized, fluidized bed, gasification system for the production of medium-Btu fuel gas for syngas, electrical power generation, chemical feedstocks, or industrial fuels and to obtain performance and scaleup data for the process and hardware. Technical progress summaries and reports are presented for the following tasks: (1) process development unit (PDU) test operations and results (gasifier test TP-033-1 and maintenance and modifications); (2) process analysis (environmental characterization results, coal gas combustion results, and fines elutriation and consumption results); (3) cold flow scaleup (modifications and maintenance, operations, and data analysis); (4) process and component engineering and design (hot fines recycle modifications, and hot recycled fines); (5) laboratory support studies (gas-solids flow modeling and coal/ash behavior). 23 figures, 23 tables.
Date:
February 17, 1983
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Fluidized-Bed Waste-Heat Recovery System development. Semiannual report, 1 August 1982-31 January 1983
The Fluidized-Bed Waste-Heat Recovery (FBWHR) System is designed to preheat this combustion air using the heat available in dirty flue gas streams. In this system, a recirculating medium is heated by the flue gas in a fluidized bed. The hot medium is then removed from the bed and placed in a second fluidized bed where it is fluidized by the combustion air. Through this process, the combustion air is heated. The cooled medium is then returned to the first bed. Initial development of this concept is for the aluminum smelting industry.
Date:
February 1, 1983
Creator:
Cole, W.E.; DeSaro, R. & Joshi, C.
Object Type:
Report
System:
The UNT Digital Library
Zircaloy-oxidation and hydrogen-generation rates in degraded-core accident situations
Oxidation of Zircaloy cladding is the primary source of hydrogen generated during a degraded-core accident. In this paper, reported Zircaloy oxidation rates, either measured at 1500 to 1850/sup 0/C or extrapolated from the low-temperature data obtained at <1500/sup 0/C, are critically reviewed with respect to their applicability to a degraded-core accident situation in which the high-temperature fuel cladding is likely to be exposed to and oxidized in mixtures of hydrogen and depleted steam, rather than in an unlimited flux of pure steam. New results of Zircaloy oxidation measurements in various mixtures of hydrogen and steam are reported for >1500/sup 0/C. The results show significantly smaller oxidation and, hence, hydrogen-generation rates in the mixture, compared with those obtained in pure steam. It is also shown that a significant fraction of hydrogen, generated as a result of Zircaloy oxidation, is dissolved in the cladding material itself, which prevents that portion of hydrogen from reaching the containment building space. Implications of these findings are discussed in relation to a more realistic method of quantifying the hydrogen source term for a degraded-core accident analysis.
Date:
February 1, 1983
Creator:
Chung, H. M. & Thomas, G. R.
Object Type:
Article
System:
The UNT Digital Library
[Mike Richards at Desert Mountains, 1983]
A photograph of Mike Richards standing and resting his arm on a viewer in a desert mountain setting. Written on the back of the card is the date, "Feb. 23, 1983."
Date:
February 23, 1983
Creator:
unknown
Object Type:
Photograph
System:
The UNT Digital Library
Tube Vibration in Industrial-Size Test Heat Exchanger (90° Square Layout)
Tube vibrations in heat exchangers are being systematically investigated in a series of tests performed with an industrial-size test exchanger. Results from water-flow tests of eleven different tube bundles, in six- and eight-cross-pass configurations on a 90 degree square layout with a pitch-to-diameter ratio of 1.25 are reported. The test cases include full tube bundles, no-tubes-in-window bundles, finned tube bundles, and proposed field and design fixes. The testing focused on identification of the lowest critical flow-rate to initiate fluid-elastic instability (large amplitude tube motion) and the location within the bundle of the tubes which first experience instability. The test results are tabulated to permit comparison with results obtained from previous tests with a 30 degree triangular layout tube bundle. Instability criteria are evaluated preliminarily. Pressure drop data are also generated and reported.
Date:
February 1983
Creator:
Halle, Henry & Wambsganss, M. W.
Object Type:
Report
System:
The UNT Digital Library
Experiments on Tubes Conveying Fluid
Tests are conducted for tubes conveying fluid for six types of support conditions. The objectives are to understand the dynamic characteristics of such systems for different support conditions and to explore the methods to control tube stability. Transition from one instability mechanism to another is examined, and the feasibility of using feedback control to increase the critical flow velocity is demonstrated.
Date:
February 1983
Creator:
Jendrzejczyk, J. A. & Chen, S. S.
Object Type:
Report
System:
The UNT Digital Library
Comparison of Testing Methods for Latent-Heat-Storage Devices
ASHRAE Standard 94-77, Method of Testing Thermal Storage Devices Based on Thermal Performance, was developed to allow manufacturers of thermal energy storage devices to compare their products in a meaningful way. When Standard 94-77 was used for thermal energy storage products based on latent heat storage, the Standard was found to be inadequate for comparison of these devices. Standard Project Committee SPC 94.1 was established to devise a Standard that would be adequate for comparing latent heat systems. The purpose of this report is to describe several alternatives to Standard 94-77 and discuss the advantages and disadvantages of each alternative. The discussion focuses on two proposed replacement standards and includes experimental results for each. The experimental results are from tests conducted on a PCM storage tank that uses sodium thiosulfate as the PCM and water as the heat transfer fluid. The experimental arrangement is discussed in detail.
Date:
February 1983
Creator:
Cole, Roger Lynn; Hull, J. R.; Lwin, Y. & Cha, Y. S.
Object Type:
Report
System:
The UNT Digital Library
High gain free electron laser at ETA
A single pass, tapered electron wiggler and associated beam transport has been constructed at the Experimental Test Accelerator (ETA) at Lawrence Livermore National Laboratory (LLNL). The system is designed to transport 1 kA of 4.5 MeV electrons with an emittance of 30 millirad-cm. The planar wiggler is provided by a pulsed electromagnet. The interaction region is an oversized rectangular waveguide. Quadrupole fields stabilize the beam in the plane parallel to the wiggler field. The 3 meter long wiggler has a 9.8 cm period. The Free Electron Laser (FEL) will serve as an amplifier for input frequencies of 35 GHz and 140 GHz. The facility is designed to produce better than 500 Megawatts peak power.
Date:
February 9, 1983
Creator:
Orzechowski, T.J.; Prosnitz, D.; Halbach, K.; Kuenning, R.; Paul, A.; Hopkins, D. et al.
Object Type:
Article
System:
The UNT Digital Library
Light-scattering studies of silica aerogels
Due to its combination of transparency and low thermal conductivity, aerogel holds considerable promise for use as insulating window materials for residential and commercial applications. This paper reports on the preliminary investigation of the optical and scattering properties of silica aerogels. It briefly describes the properties of aerogels important for window glazing applications. The optical properties are then described, followed by a discussion of the scattering measurements and their interpretation.
Date:
February 1, 1983
Creator:
Hunt, A.J.
Object Type:
Article
System:
The UNT Digital Library
Passive-solar-cooling system concepts for small office buildings. Final report
This report summarizes the efforts of a small group of building design professionals and energy analysis experts to develop passive solar cooling concepts including first cost estimates for small office buildings. Two design teams were brought together at each of two workshops held in the fall of 1982. Each team included an architect, mechanical engineer, structural engineer, and energy analysis expert. This report presents the passive cooling system concepts resulting from the workshops. It summarizes the design problems, solutions and first-cost estimates relating to each technology considered, and documents the research needs identified by the participants in attempting to implement the various technologies in an actual building design. Each design problem presented at the workshops was based on the reference (base case) small office building analyzed as part of LBL's Cooling Assessment. Chapter II summarizes the thermal performance, physical specifications and estimated first-costs of the base case design developed for this work. Chapters III - VI describe the passive cooling system concepts developed for each technology: beam daylighting; mass with night ventilation; evaporative cooling; and integrated passive cooling systems. The final Chapters, VII and VIII present the preliminary implications for economics of passive cooling technologies (based on review of the …
Date:
February 1, 1983
Creator:
Whiddon, W. I. & Hart, G. K.
Object Type:
Report
System:
The UNT Digital Library
Radiation transport in numerical astrophysics
In this article, we discuss some of the numerical techniques developed by Jim Wilson and co-workers for the calculation of time-dependent radiation flow. Difference equations for multifrequency transport are given for both a discrete-angle representation of radiation transport and a Fick's law-like representation. These methods have the important property that they correctly describe both the streaming and diffusion limits of transport theory in problems where the mean free path divided by characteristic distances varies from much less than one to much greater than one. They are also stable for timesteps comparable to the changes in physical variables, rather than being limited by stability requirements.
Date:
February 1, 1983
Creator:
Lund, C.M.
Object Type:
Article
System:
The UNT Digital Library
Upper Sand Mountain Parish Solar Construction Workshops. Final performance report
The Upper Sand Mountain Parish continues to employ its initial strategy for involving high school vocational students with the pre cutting and instructional assembly aid to area families. The parish project works with high school vocational classes in pre fabbing solar devices into kit form. Then, students are employed to serve as instructors for Saturday construction workshops at the local electric cooperative. Trained teams of older and unemployed adults work with youth in building solar greenhouses for those able to pay labor. Over three years, the project has assisted and built 50 to 60 attached solar greenhouses with construction teams realizing in excess of $26,000 in labor for newly developed skills. The project continues to assist owners in monitoring and developing horticulturally as well as energy producing greenhouses. During the spring of 1982, the parish assisted greenhouse owners in marketing over 60,000 bedding plants worth over $3000. Monthly Greenhouse Owner Fellowship meetings have been a helpful setting for sharing of ideas and exchange of insights. A low interest solar loan fund, offering 5% loans for three years, has assisted over 30 families in going solar. The principle for this revolving fund has almost reached the $15,000 mark. The track record …
Date:
February 1, 1983
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Evaluation of Construction Loads in Multistory Concrete Buildings
Report issued by the National Bureau of Standards over construction loads of multistory concrete buildings. Evaluations of the construction loads are discussed. This report includes illustrations, and photographs.
Date:
February 1983
Creator:
Fattal, S. G.
Object Type:
Report
System:
The UNT Digital Library
A Training Seminar in Human Relations and a Personality Trait Study of Internal Auditors
Little research has been done on the personality of internal auditors. However, there does exist a negative stereotype. They are seen as hostile and unsympathetic. The purpose of this research was to see if the negative stereotype was indeed true and to see if undesirable behavior could be changed through training.
Date:
February 1983
Creator:
Bull, Dennis L. (Dennis Lee)
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Southwest Retort, Volume 35, Number 6, February 1983
This publication of the Dallas-Fort Worth Section of the American Chemical Society includes information about research, prominent scientist, organizational business, and various other stories of interest to the community.
Date:
February 1983
Creator:
American Chemical Society. Dallas/Fort Worth Section.
Object Type:
Journal/Magazine/Newsletter
System:
The UNT Digital Library
The Panola Panorama (Carthage, Tex.), Vol. 33, No. 8, Ed. 1 Monday, February 14, 1983
Semimonthly student newspaper from Panola Junior College in Carthage, Texas that includes news of interest to the Panola Junior College community along with advertising.
Date:
February 14, 1983
Creator:
Kaun, Paul
Object Type:
Newspaper
System:
The Portal to Texas History
Core-debris quenching-heat-transfer rates under top- and bottom-reflood conditions. [PWR; BWR]
This paper presents recent experimental data for the quench-heat-transfer characteristics of superheated packed beds of spheres which were cooled, in separate experiments, by top- and bottom-flooding modes. Experiments were carried out with beds of 3-mm steel spheres of 330-mm height. The initial bed temperature was 810 K. The observed heat-transfer rates are strongly dependent on the mode of water injection. The results suggest that top-flood bed quench heat transfer is limited by the rate at which water can penetrate the bed under two-phase countercurrent-flow conditions. With bottom-reflood the heat-transfer rate is an order-of-magnitude greater than under top-flood conditions and appears to be limited by particle-to-fluid film boiling heat transfer.
Date:
February 1, 1983
Creator:
Ginsberg, T.; Tutu, N.; Klages, J.; Schwarz, C. E. & Sanborn, Y.
Object Type:
Article
System:
The UNT Digital Library
Tube vibration in industrial-size test heat exchanger (90/sup 0/ square layout)
Tube vibrations in heat exchangers are being systematically investigated in a series of tests performed with an industrial-size test exchanger. Results from waterflow tests of eleven different tube bundles, in six- and eight-crosspass configurations on a 90/sup 0/ square layout with a pitch-to-diameter ratio of 1.25 are reported. The test cases include full tube bundles, no-tubes-in-window bundles, finned tube bundles, and proposed field and design fixes. The testing focused on identification of the lowest critical flowrate to initiate fluidelastic instability (large amplitude tube motion) and the location within the bundle of the tubes which first experience instability. The test results are tabulated to permit comparison with results obtained from previous tests with a 30/sup 0/ triangular layout tube bundle. Instability criteria are evaluated preliminarily. Pressure drop data are also generated and reported.
Date:
February 1, 1983
Creator:
Halle, H. & Wambsganss, M.W.
Object Type:
Report
System:
The UNT Digital Library
Effective Lagrangian for supersymmetric QCD
I present a Lagrangian which describes the spontaneous breaking of chiral symmetries in strongly interacting supersymmetric Yang-Mills theory with matter fields. This Lagrangian predicts that supersymmetry is spontaneously broken if the matter fields have precisely zero mass.
Date:
February 1, 1983
Creator:
Peskin, M.E.
Object Type:
Article
System:
The UNT Digital Library
Eikonal theory of the transition to phase incoherence
When a monochromatic electromagnetic wave propagates through a nonuniform plasma (of n dimensions), its refraction may be studied in terms of its family of rays in 2n-dimensional phase space (k,x). These rays generate and n-dimensional surface. Imbedded in the phase space. The wave amplitude and phase are defined on this surface. As the rays twist and separate (from the dynamics of the ray Hamiltonian), the surface develops pleats and becomes convoluted. Projection of the surface onto x-space then yields a multivalued k(x). The local spectral density, as a function of k for given x, exhibits sharp spikes at these k(x), in the ray-optics limit. The next correction yields a finite width to these spikes. As the surface becomes more and more pppleated, these spectral peaks overlap; the spectrum changes qualitatively from a line spectrum to a continuous spectrum. Correspondingly, the two-point spatial correlation function loses its long-range order, as the correlation volume contracts. This phenomenon is what we call the transition to incoherence.
Date:
February 1, 1983
Creator:
Kaufman, A. N. & Rosengaus, E.
Object Type:
Article
System:
The UNT Digital Library
Beam-shape distortion caused by transverse wake fields
As a particle bunch in a storage ring passes through a region with a transverse impedance, it generates a transverse wake electromagnetic field that is proportional to the transverse displacement of the bunch in the region. The field acts back on the bunch, causing various effects (such as instabilities) in the motion of the bunch. We study one such effect in which a transverse impedance causes the beam to be distorted in its shape. Observed at a fixed location in the storage ring, this distortion does not change from turn to turn; rather, the distortion is static in time. To describe the distortion, the bunch is considered to be divided longitudinally into many slices and the centers of change of the slices are connected into a curve. In the absence of transverse impedance, this curve is a straight line parallel to the direction of motion of the bunch. Perturbed by the transverse wake field, the curve becomes distorted. What we find in this paper is the shape of such a curve. The results obtained are applied to the PEP storage ring. The impedance is assumed to come solely from the rf cavities. We find that the beam shape is sufficiently …
Date:
February 1, 1983
Creator:
Chao, A.W. & Kheifets, S.
Object Type:
Article
System:
The UNT Digital Library
Heat-transfer characteristics of flowing and stationary particle-bed-type fusion-reactor blankets
The heat-transfer characteristics of flowing and stationary packed-particle beds have recently become of interest in connection with conceptual designs of fusion reactor blankets. A detailed literature survey has shown that the processes taking place in such beds are not fully understood despite their widespread use in the chemical industry and other engineering disciplines for more than five decades. In this study, two experimental investigations were pursued. In the first, a heat-transfer loop was constructed through which glass microspheres were allowed to flow by rgravity at controlled rates through an electrically heated stainless steel tubular test section. In the second, an annular packed bed was constructed in which heat was applied through the outer wall by electric heating of a stainless steel tube. Cooling occurred at the inner wall of the annular bed by flowing air through the central tube. A second air stream was allowed to flow through the voids of the packed bed. An error-minimization technique was utilized in order to obtain the two-dimensional one-parameter effective conductivity for the bed by comparing the experimental and theoretically predicted temperature profiles. Experiments were conducted for various modified Reynolds numbers less than ten.
Date:
February 1, 1983
Creator:
Nietert, R.E.
Object Type:
Report
System:
The UNT Digital Library
Atomic photoelectron-spectroscopy studies using synchrotron radiation
Photoelectron spectroscopy combined with tunable synchrotron radiation has been used to study the photoionization process in several atomic systems. The time structure of the synchrotron radiation source at the Stanford Synchrotron Radiation Laboratory (SSRL) was used to record time-of-flight (TOF) photoelectron spectra of gaseous Cd, Hg, Ne, Ar, Ba, and Mn. The use of two TOF analyzers made possible the measurement of photoelectron angular distributions as well as branching ratios and partial cross sections.
Date:
February 1, 1983
Creator:
Kobrin, P.H.
Object Type:
Report
System:
The UNT Digital Library
Fabrication of tungsten wire needles
Fine point needles for field emissoin are conventionally produced by electrolytically or chemically etching tungsten wire. Points formed in this manner have a typical tip radius of about 0.5 microns and a cone angle of some 30 degrees. The construction of needle matrix detector chambers has created a need for tungsten needles whose specifications are: 20 mil tungsten wire, 1.5 inch total length, 3 mm-long taper (resulting in a cone angle of about 5 degrees), and 25 micron-radius point (similar to that found on sewing needles). In the process described here for producing such needles, tungsten wire, immersed in a NaOH solution and in the presence of an electrode, is connected first to an ac voltage and then to a dc supply, to form a taper and a point on the end of the wire immersed in the solution. The process parameters described here are for needles that will meet the above specifications. Possible variations will be discussed under each approprite heading.
Date:
February 1, 1983
Creator:
Roder, A.
Object Type:
Report
System:
The UNT Digital Library