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Chaotic vibrations of nonlinearly supported tubes in crossflow
By means of the unsteady-flow theory and a bilinear mathematical model, a theoretical study is presented for chaotic vibrations associated with the fluidelastic instability of nonlinearly supported tubes in a crossflow. Effective tools, including phase portraits, power spectral density, Poincare maps, Lyapunov exponent, fractal dimension, and bifurcation diagrams, are utilized to distinguish periodic and chaotic motions when the tubes vibrate in the instability region. The results show periodic and chaotic motions in the region corresponding to fluid-damping-controlled instability. Nonlinear supports, with symmetric or asymmetric gaps, significantly affect the distribution of periodic, quasiperiodic, and chaotic motions of a tube exposed to various flow velocities in the instability region of the tube-support-plate-inactive mode.
Date:
February 1, 1992
Creator:
Cai, Y. & Chen, S.S.
Object Type:
Report
System:
The UNT Digital Library
Testimony by J. William Currie, Ph. D Manager, Energy Systems Modernization Office, Battelle, Pacific Northwest Laboratories before The Senate Committee on Governmental Affairs Washington D. C
This report consists of the testimony by J. William Currie, Manager, Energy Systems Modernization Office, Battelle, Pacific Northwest Laboratories before The Senate Committee on Governmental Affairs, Washington, DC on February 18, 1992. He states It is a pleasure to have the opportunity to talk with this distinguished committee about energy conservation technologies and policies, especially as they relate to federal energy use and the commercialization of energy-efficiency technologies. Clearly, using energy more efficiently offers the potential for tremendous cost savings and environmental benefits in the United States and throughout the rest of the world. The challenge, especially with regard to the federal sector, is to lay the foundation for ensuring that the citizens of our nation realize the maximum savings and environmental benefit over the long run. This is the primary focus of my comments today.''
Date:
February 18, 1992
Creator:
Currie, J. W.
Object Type:
Report
System:
The UNT Digital Library
Pyrolysis and gasification of coal at high temperatures
The macropore structure of chars is a major factor in determining their reactivity during the gasification stage. The major objectives of this contract were to (a) quantify by direct measurements the effect of pyrolysis conditions of the macropore structure, and (b) establish how the macropores affected the reactivity pattern, the ignition behavior and the fragmentation of the char particles during gasification in the regime of strong diffusional limitations. Results from this project provide much needed information on the factors that affect the quality of the solid products (chars) of coal utilization processes (for example, mild gasification processes). The reactivity data will also provide essential parameters for the optimal design of coal gasification processes. (VC)
Date:
February 10, 1992
Creator:
Zygourakis, K.
Object Type:
Report
System:
The UNT Digital Library
Public involvement in integrated resource planning: A study of demand-side management collaboratives
Many utilities and nonutility parties (NUPs) across the country have tried a new approach to reaching agreement on Demand-Side Management (DSM) program design and policy issues. Through this, which is called the DSM collaborative process, parties who have often been adversaries in the past attempt to reach consensus rather than using traditional litigation to resolve differences. We examined nine cases of DSM collaboration involving 24 utilities and approximately 50 NUPs in 10 states. This is the first comprehensive, in-depth review and assessment of collaboratives and it allows conclusions to be drawn about the collaborative process and the factors that contribute to successful efforts of this type. Collaboratives are described in terms of four major contextual and organizational characteristics: regulatory and legal history, parties involved and parties excluded, collaborative scope, and the collaborative process itself.
Date:
February 1, 1992
Creator:
Raab, J. (Raab (J.), Boston, MA (United States)) & Schweitzer, M. (Oak Ridge National Lab., TN (United States))
Object Type:
Report
System:
The UNT Digital Library
Research at LAMPF
During the past decade, both the science program and the experimental facilities at LAMPF have undergone some significant changes. This report is a concise description of the current research initiatives and of new directions being proposed for the future research program at LAMPF. Traditionally the LAMPF physics program has explored nuclear systems with hadronic probes: pions, protons, and neutrons. In recent years the exploitation of the intense lepton beams -- neutrinos and muons -- at LAMPF has received increasing emphasis. Explorations of issues in electroweak physics and precision tests of quantum electrodynamics have been significant areas of experimentation. A new concept of the program is an increased emphasis on the role of weak interactions in hadronic systems. Here the electroweak force is treated as a well-understood interaction, which can be used to reveal the wave functions and properties of hadronic systems. The manifestations of the electroweak force may be discussed either in the language of quarks interacting through the exchange of W and Z bosons or in terms of nucleons interacting through the exchange of mesons described by both strong and weak coupling constants. Taken together, these topics provide a rich and vital program of fundamental interest in nuclear physics. …
Date:
February 1, 1992
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Near-Site Transportation Infrastructure Project
There are 122 commercial nuclear facilities from which spent nuclear fuel will be accepted by the Federal Waste Management System (FWMS). Since some facilities share common sites and some facilities are on adjacent sites, 76 sites were identified for the Near-Site Transportation Infrastructure (NSTI) project. The objective of the NSTI project was to identify the options available for transportation of spent-fuel casks from each of these commercial nuclear facility sites to the main transportation routes -- interstate highways, commercial rail lines and navigable waterways available for commercial use. The near-site transportation infrastructure from each site was assessed, based on observation of technical features identified during a survey of the routes and facilities plus data collected from referenced information sources. The potential for refurbishment of transportation facilities which are not currently operational was also assessed, as was the potential for establishing new transportation facilities.
Date:
February 1, 1992
Creator:
Viebrock, J.M. & Mote, N. (Nuclear Assurance Corp., Norcross, GA (United States))
Object Type:
Report
System:
The UNT Digital Library
Tensile and burst tests in support of the cadmium safety rod failure evaluation
The reactor safety rods may be subjected to high temperatures due to gamma heating after the core coolant level has dropped during the ECS phase of hypothetical LOCA event. Accordingly, an experimental safety rod testing subtask was established as part of a task to address the response of reactor core components to this accident. This report discusses confirmatory separate effects tests conducted to support the evaluation of failures observed in the safety rod thermal tests. As part of the failure evaluation, the potential for liquid metal embrittlement (LME) of the safety rod cladding by cadmium (Cd) -- aluminum (Al) solutions was examined. Based on the test conditions, literature data, and U-Bend tests, its was concluded that the SS304 safety rod cladding would not be subject to LME by liquid Cd-Al solutions under conditions relevant to the safety rod thermal tests or gamma heating accident. To confirm this conclusion, tensile tests on SS304 specimens were performed in both air and liquid Cd-Al solutions with the range of strain rates, temperatures, and loading conditions spanning the range relevant to the safety rod thermal tests and gamma heating accident.
Date:
February 1, 1992
Creator:
Thomas, J.K.
Object Type:
Report
System:
The UNT Digital Library
Z yields jets+. gamma. as a signal for R-parity violation
Supersymmetric models with explicit R-parity violation can induce new rare decay modes of the Z boson into single supersymmetric particles. Here, the rate and signature for one such decay, Z {yields} {tilde {upsilon}} {gamma}, is examined, where it is found that the rate is at least an order of magnitude smaller than that for the process Z{yields} H{gamma}, even with larger values of the R-parity violating couplings.
Date:
February 1, 1992
Creator:
Hewett, J.L.
Object Type:
Article
System:
The UNT Digital Library
On the measuremnt of. pi
Inspired by Stillman Drake's definition of Galilean Units as those for which (L/T{sup 2} = ({pi}{sup 2}/8)g) where g is any finite, constant acceleration measured in units of L and T, we construct a kinematical dimensional analysis based only on two universal, dimensionless constants. For the linear relation between L and T we use Einsteinian Units L/ = (1)c. For orbiting masses negligible compared to some mass unit M, we use Keplerian Units based on his second law (L{sup 2}/T = (1/2{pi})h/M). Then the unit for orbital angular momentum is {Dirac h}, independent of the mass scale. This allows us to define dimensionless coupling constants f{sup 2} = {beta} = v/c where v is the orbital velocity. We find that most of relativistic quantum mechanics requires only kinematical units. Dynamical units require a mass scale with universal significance, set by the orbital velocity v = c (or f{sup 2} = 1). In dimensional form this becomes M = (1)({Dirac h}c/G){sup 1/2}. Assuming baryon number conservation, the fact that the proton is the lightest stable baryon allows us to calculate {Dirac h}c/Gm{sub p}{sup 2} {approx} 1.7 {times} 10{sup 38} as the Beckenstein number of the proton--the number of bits of information …
Date:
February 1, 1992
Creator:
Noyes, H. Pierre
Object Type:
Article
System:
The UNT Digital Library
Vibration study of the APS storage ring vacuum-chamber/girder assembly
The overall objective of this study is to obtain insights into the dynamic coupling between the storage ring vacuum chamber and girder, and an assessment of the potential for unacceptable vibration amplitudes that would require redesign of the vacuum chamber supports. Specific objectives include determination of the vibrational characteristics (natural frequencies and modes) of the coupled vacuum-chamber/girder system, measurement of response amplitudes to forced excitation and ambient floor motion, and calculation of magnification factors associated with the various coupled vibration modes. 1 ref.
Date:
February 1, 1991
Creator:
Jendrzejczyk, J.A.; Wambsganss, M.W. & Smith, R.K.
Object Type:
Report
System:
The UNT Digital Library
Establishment and maintenance of a coal sample bank and data base
Headspace oxygen contents of several designated drums containing {minus}l inch and {minus}{1/4} inch coal were measured. These measurements were later discontinued by agreement with the Project Manager, as the leakage of plastic drums and buckets has been well documented. During the current reporting period a total of 65 data printouts were distributed. In addition, 10 special data requests were fulfilled by either search/sort and printout or creation of a data disk, resulting in distribution of limited information on 4,479 samples. Several preliminary requests for Sample Bank and Data Base information and price quotations have also been handled. Four hundred copies of the 61-page second edition of the booklet The Penn State Coal Sample Bank and Data Base'' were received from the printer. Changes in format have allowed increased content in fewer pages, to reduce printing and mailing costs. Three hundred thirty-nine copies were distributed. Data generated on samples DECS-1 through DECS-14 were added to the Penn State Coal Data Base. Map reference data were verified for all 14 samples.
Date:
February 6, 1991
Creator:
Davis, A.
Object Type:
Report
System:
The UNT Digital Library
The thermodynamic properties of 2-methylaniline and trans-(R,S)- decahydroquinoline
Measurements leading to the calculation of the ideal-gas thermodynamic properties for 2-methylaniline and trans-(R,S)-decahydroquinoline are reported. Experimental methods included combustion calorimetry, adiabatic heat-capacity calorimetry, comparative ebulliometry, inclined-piston gauge manometry, and differential-scanning calorimetry (dsc). Entropies, enthalpies, and Gibbs energies of formation were derived for the ideal gas at selected temperatures for both compounds. Critical properties were determined for 2-methylaniline with the dsc. Measured combustion enthalpies, vapor pressures, critical properties, and ideal-gas entropies were compared with estimated and experimental literature values. 59 refs., 7 figs., 15 tabs.
Date:
February 1, 1990
Creator:
Steele, W. V.; Chirico, R. D.; Nguyen, A. & Knipmeyer, S. E.
Object Type:
Report
System:
The UNT Digital Library
Pump down rate for SRF cavities
This note is about calculations aimed at quantifying adequate pumping speeds of evacuation of normally humid clean-room air from typical Superconducting Radiofrequency (SRF) cavities. The subject is of high relevance to the semiconductor industry, where the yield of VLSI (Very Large Scale Integration) chip production is affected by micron size particles which may cause fatal defects to their micron and sub-micron features. The recent availability of particle counters capable of operating in vacuum has stimulated measurements at reduced pressures in this subject.
Date:
February 1, 1992
Creator:
Kuchnir, M. (Fermi National Accelerator Lab., Batavia, IL (United States)) & Knobloch, J. (Cornell Univ., Ithaca, NY (United States). Lab. of Nuclear Studies)
Object Type:
Report
System:
The UNT Digital Library
Inverse phase transitions: Does baryogenesis lead to dark matter
The phase structure of a field theory can have two qualitatively different forms- the less familiar of which involves high temperature symmetry breaking and low temperature symmetry restoration and is dubbed an inverse phase transition. After a general discussion of such inverse phase transitions we present an application of this phenomenon in which the symmetry under consideration is baryon number. The model has the virtues of generating the observed quark-antiquark asymmetry (with no explicit baryon number violating interactions) while simultaneously providing the dark matter known to exist in galactic halos and clusters of galaxies. Constraints from cosmology and particle physics highly constrain the mass of this dark matter candidate: 40GeV < m{sub phi} < 50GeV. In this way we demonstrate our main conclusion: the exotic phase structure of the inverted form can give rise to novel, predictive and testable cosmological phenomenon.
Date:
February 1, 1992
Creator:
Dodelson, S. (Fermi National Accelerator Lab., Batavia, IL (United States)); Greene, B.R. (Cornell Univ., Ithaca, NY (United States). Newman Lab. of Nuclear Studies) & Widrow, L.M. (Toronto Univ., ON (Canada). Canadian Inst. for Theoretical Astrophysics)
Object Type:
Article
System:
The UNT Digital Library
Measurements of surface ocean carbon dioxide partial pressure during WOCE
Progress during the past year of research under Measurements of Surface Ocean Carbon Dioxide Partial Pressure During WOCE'' has been significant. As was described in our previous progress report, the startup phase of this research was severely frustrated by delays in the US WOCE Hydrographic Program (WHP), which in turn were caused by delays in the mid-life refit of the R/V Knorr. As a result the high latitude southeastern Pacific work (WHP lines P19S and P16S) originally scheduled for the 1990 austral summer has still not been carried out. As a substitute, the smaller R/V Thomas Washington was pressed into service during mid-1991 to carry out lower-latitude portions of the WHP P16 and P17 lines - the TUNES Expedition. Because this ship is much smaller than the R/V Knorr, she could not carry a full complement of WHP programs and seagoing personnel and was restricted by her size and the time of year to lower-latitude work. Our original proposal for carbon dioxide measurements was designed to divide the work between legs in which we participated as part of the WHP dissolved CFC program (under separate NSF funding) and legs in which we entrusted the operation of our system to other …
Date:
February 25, 1992
Creator:
Weiss, R.F.
Object Type:
Report
System:
The UNT Digital Library
Information systems for engineering sustainable development
The ability of a country to follow sustainable development paths is determined to a large extent by the capacity or capabilities of its people and its institutions. Specifically, capacity-building in the UNCED terminology encompasses the country's human, scientific, technological, organizational, institutional, and resource capabilities. A fundamental goal of capacity-building is to enhance the ability to pose, evaluate and address crucial questions related to policy choices and methods of implementation among development options. As a result the United Nations Conference on Environment and Development (UNCED) Agenda 21 planning process has identified the need for better methods by which information can be transferred between industrialized nations and developing nations. The reasons for better methods of information transfer include facilitating decisions related to sustainable development and building the capacity of developing nations to better plan their future in both an economical and environmentally sound manner. This paper is a discussion on mechanisms for providing information and technologies available for presenting the information to a variety of cultures and levels of technical literacy. Consideration is given to access to information technology as well as to the cost to the user. One concept discussed includes an Engineering Partnership'' which brings together the talents and resources …
Date:
February 27, 1992
Creator:
Leonard, R.S.
Object Type:
Article
System:
The UNT Digital Library
Canby Area Service Project : Substation and Associated Transmission Line : Environmental Assessment.
Bonneville Power Administration (BPA) provides power to Surprise Valley Electrification Corporation (SVEC) in Modoc County, California. BPA uses PacificCorp's substation and transmission facilities between Alturas and Canby, California to transfer power to SVEC's Canby Substation. In the next year, SVEC expects increased industrial, agricultural, and residential electric loads on their 69-kV transmission system south of Canby. SVEC's substation can accommodate only about 10 percent of the expected additional electric load. BPA's proposed action is intended to meet SVEC's increasing electric load. BPA proposes to meet SVEC's increasing energy load by tapping into BPA's existing BPA Malin-Warner 230-kV transmission line, and building an 7.9-mile transmission line to a new BPA substation. BPA proposes to build the new substation next to the west side of SVEC's Canby Substation (Figure 1). This new substation will allow SVEC to move the additional power over their existing transmission or distribution lines. This report is the environmental assessment of the potential impact of the proposed project. The assessment determined that no environmental impact statement'' is not required.
Date:
February 1, 1992
Creator:
United States. Bonneville Power Administration.
Object Type:
Report
System:
The UNT Digital Library
Measured energy savings and economics of retrofitting existing single-family homes: An update of the BECA-B database
The energy bill for US single-family households was over $77 billion in 1987 (excluding auto fuel purchases), accounting for approximately 20% of national energy expenditures. Large sums are spent on residential retrofits by individual homeowners, government agencies, and utilities. As of late 1987, over 21 million households indicated that they had added at least one energy-saving measure in the previous two years, while a recent Electric Power Research Institute (EPRI) study estimated that nearly 15 million residential customers have participated in some kind of demand-side management (DSM) program. Given the level of continuing investments in residential energy efficiency, accurate estimates of savings from various conservation measures are increasingly necessary, especially as new technologies become more sophisticated and incremental efficiency gains more difficult to achieve. This report provides a comparative analysis of measured data on the performance and cost-effectiveness of energy-saving measures in existing single-family homes, based on information in the Buildings Energy-Use Compilation and Analysis (BECA) data base. The initial BECA report on measured data for single-family retrofits was completed seven years ago. In updating the single-family database, we have added 135 data points, representing over 33,000 houses, to the original database of 145 retrofit projects. The report is organized …
Date:
February 1, 1991
Creator:
Cohen, S.D.; Goldman, C.A. & Harris, J.P.
Object Type:
Report
System:
The UNT Digital Library
Catalyst dispersion and activity under conditions of temperature-staged liquefaction
The general objectives of this research are (1) to investigate the use of highly dispersed catalysts for the pretreatment of coal by mild hydrogenation, (2) to identify the active forms of the catalysts under reaction conditions and (3) to clarify the mechanisms of catalysis. The ultimate objective is to ascertain if mild catalytic hydrogenation resulting in very limited or no coal solubilization is an advantageous pretreatment for the transformation of coal into transportable fuels. The experimental program will focus upon the development of effective methods of impregnating coal with catalysts, evaluating the conditions under which the catalysts are most active and establishing the relative impact of improved impregnation on conversion and product distributions obtained from coal hydrogenation.
Date:
February 1, 1992
Creator:
Davis, A.; Schobert, H.H.; Mitchell, G.D. & Artok, L.
Object Type:
Report
System:
The UNT Digital Library
Control of energetic ion confinement by ion cyclotron range of frequency waves
It is shown that ICRF waves can induce fast convective radial transport of energetic ions in a tokamak geometry without affecting the background ion transport. Spatially inhomogeneous ICRF waves with directional parallel wave vectors are needed; otherwise, a net parallel flow of the energetic ions has to be present. 8 refs.
Date:
February 1, 1990
Creator:
Chang, C.S. (New York Univ., NY (USA). Courant Inst. of Mathematical Sciences)
Object Type:
Report
System:
The UNT Digital Library
Mort User's Manual: For use with the Management Oversight and Risk Tree analytical logic diagram
This report contains the User's Manual for MORT (Management Oversight and Risk Tree), a logic diagram in the form of a work sheet'' that illustrates a long series of interrelated questions. MORT is a comprehensive analytical procedure that provides a disciplined method for determining the causes and contributing factors of major accidents. Alternatively, it serves as a tool to evaluate the quality of an existing system. While similar in many respects to fault tree analysis, MORT is more generalized and presents over 1500 specific elements of an ideal universal'' management program for optimizing environment, safety and health, and other programs. This User's Manual is intended to be used with the MORT diagram dated February 1992.
Date:
February 1, 1992
Creator:
Knox, N.W. & Eicher, R.W.
Object Type:
Report
System:
The UNT Digital Library
The 17 keV neutrino and neutrino tagging
P-788 at FNAL proposed to search for neutrino oscillations in a tagged neutrino line. A K{sub L} beam and the decay modes K{sub L} {yields} {pi}{mu}{nu}{sub {mu}} and K {sub L} {yields} {pi}e{nu}{sub e} provides the neutrino flux. An upstream tagging spectrometer then identifies the hadron and lepton and reconstructs the K{sub L} decay; the lepton identification will specifies the neutrino as {nu}{sub e} or {nu}{sub {mu}} and distinguishes {nu} from {bar {nu}} at the decay vertex. A neutrino detector modeled after an existing deep-inelastic scattering spectrometer (rates have been worked out for the CCFR apparatus) can be used to associate the K{sub L} with a neutrino interaction, measure the neutrino energy, and analyze outgoing muons. Monte Carlo studies show that 30K {nu}{sub e} and 20K {nu}{sub {mu}} could be obtained in two fixed target runs at the Tevatron.
Date:
February 1, 1992
Creator:
Bernstein, R.H.
Object Type:
Article
System:
The UNT Digital Library
[Bifurcations and Patterns in Nonlinear Dissifative Systems]
This report discusses the following topics: Rayleigh-Benard convection with an imposed horizontal flow; Rayleigh-Benard convection in a gas under non-boussinesq conditions; electro- convection in a nematic liquid crystal; and Rayleigh-Benard convection in a nematic liquid crystal. (LSP)
Date:
February 26, 1992
Creator:
Ahlers, G. & Cannell, D. S.
Object Type:
Report
System:
The UNT Digital Library
(Study of flow properties of wet solids using laser induced photochemical anemometry)
Research continues on the flow properties of wet solids. During this period we have made: progress in the analysis of the accuracy of the technique, progress in firming the foundations of LIPA for Solid-Liquid Mixtures, progress in the construction of better prototype skimmers, continued progress in chemically manufacturing both more red europium imbedded CaF{sub 2} and Green liquid Flowlite, and progress in understanding the coupling of LIPA chemicals snd dynamic range and timing. (VC)
Date:
February 23, 1992
Creator:
Falco, B.
Object Type:
Report
System:
The UNT Digital Library