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Three-dimensional temperature history of a multipass filled weldment. Part 2. [HEATINGS]

Description: Computer simulation of the three-dimensional temperature history in a multipass filled weldment was attempted by modifying a transient heat transfer code, HEATING5. The model includes temperature-dependent physical parameters, radiation and convection heat losses, turbulent and laminar convection in the molten pool, and variable arc velocity, intensity, and weld geometry. The model requires approximately 28 CPU min to simulate one second of welding. 15 figures, 8 tables.
Date: December 21, 1976
Creator: Pinkowish, J.A. & Whitman, P.K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Occurrence and use of complex resonances (poles in scattering and radiation problems)

Description: In a wide variety of physics problems, especially those which involve wave phenomena such as in electromagnetics and acoustics, a behavior results that can be described by systems of linear (partial) differential equations. Solutions to such problems often can be expressed simply in the form of an exponential series. Some specific background material for this approach is discussed, and a variety of example applications is summarized. (WHK)
Date: December 15, 1981
Creator: Miller, E. K.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Analysis of production data from the Krafla geothermal field, Iceland

Description: The analysis of flow rate and enthalpy data from several wells completed in the same two-phase zone of Krafla geothermal reservoir has yielded consistent relative permeability parameters. It is found that k/sub rl/ + k/sub rv/ = 1 over the entire range of two-phase flow conditions from immobile liquid to immobile vapor. The available data provide relative permeability parameters as a function of flowing enthalpy only. The relationship between flowing enthalpy and in-place vapor saturation remai… more
Date: December 1, 1983
Creator: Pruess, K.; Bodvarsson, G. S. & Stefansson, V.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Stanford Geothermal Program, reservoir and injection technology

Description: This annual report of the Stanford Geothermal Program presents major projects in reservoir and injection technology. The four include: (1) an application of the boundary element method to front tracking and pressure transient testing; (2) determination of fracture aperture, a multi-tracer approach; (3) an analysis of tracer and thermal transients during reinjection; and, (4) pressure transient modeling of a non-uniformly fractured reservoir. (BN)
Date: December 1, 1988
Creator: Horne, R.; Ramey, H.J. Jr.; Miller, F.G.; Brigham, W.E. & Kruger, P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Cladding failure by local plastic instability

Description: Cladding failure is one of the major considerations in analysis of fuel-pin behavior during hypothetical accident transients since time, location, and nature of failure govern the early postfailure material motion and reactivity feedback. Out-of-pile thermal transient tests of both irradiated and unirradiated fast-reactor cladding show that local plastic instability, or bulging, often precedes rupture and that the extent of local instability limits the initial rip length. To investigate the det… more
Date: December 1, 1977
Creator: Kramer, J. M. & Deitrich, L. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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An Integral Design Technique for Wideband Multistage Transistor Amplifiers

Description: A philosophy for designing wideband multistage transistor amplifiers is presented. The amplifier was visualized as an integral unit, the interstage networks constituting the elements of the amplifier unit. By designing the amplifier as a unit and adjusting the over-all response (gain and bandwidth) with the interstage time constants, an increase in gain-bandwidth product was realized over the iteratively designed amplifiers. The resulting increase in gainbandwidth product resulted from absence … more
Date: December 14, 1961
Creator: Scott, L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Reservoir and injection technology and Heat Extraction Project

Description: For the Stanford Geothermal Program in the fiscal year 1989, the task areas include predictive modeling of reservoir behavior and tracer test interpretation and testing. Major emphasis is in reservoir technology, reinjection technology, and heat extraction. Predictive modeling of reservoir behavior consists of a multi-pronged approach to well test analysis under a variety of conditions. The efforts have been directed to designing and analyzing well tests in (1) naturally fractured reservoirs; (… more
Date: December 31, 1989
Creator: Horne, R.N.; Ramey, H.H. Jr.; Miller, F.G.; Brigham, W.E. & Kruger, P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Elastic-wave radiation from spherical sources

Description: The radiation of spherical compressional waves from a spherical cavity in an ideal elastic solid is treated. The equations for the radiation source and field are written in terms of the reduced-displacement potential. The source equation is studied in terms of characteristic frequencies, corresponding periods and wavelengths, and damping. The field equations for the stresses, strains, radial displacement, etc., are reviewed with regard to the transitions between the near and far fields. The nat… more
Date: December 7, 1979
Creator: Rodean, H.C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Finite-element method for above-core structures. [LMFBR]

Description: Three-dimensional finite-element models for the treatment of the nonlinear, transient response of a fast breeder reactor's above-core structures are described. For purposes of treating arbitrarily large rotations, node orientations are described by unit vectors and the deformable elements are treated by a corotational formulation in which the coordinate system is embedded in the elements. Deformable elements may be connected either to nodes directly or through rigid bodies. The time integration… more
Date: December 1, 1979
Creator: Kennedy, J. M. & Belytschko, T. B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Thermal-hydraulic analysis of the dual-function gamma thermometer

Description: A computational study was performed to investigate the potential of a modified gamma thermometer (GT) as a monitor of both the localized power level and the core cooling in a PWR. The volumetric heat source within the thermometer was updated to include heat deposited by neutrons as well as heat deposited by decay gammas and neutron-induced gammas. Utilizing this source, along with a more detailed thermal-hydraulics model, a series of thermal-hydraulic calculations were performed to simulate cer… more
Date: December 1, 1981
Creator: Johnson, J.O. & Burns, T.J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Object Classification at the Nearby Supernova Factory

Description: We present the results of applying new object classification techniques to the supernova search of the Nearby Supernova Factory. In comparison to simple threshold cuts, more sophisticated methods such as boosted decision trees, random forests, and support vector machines provide dramatically better object discrimination: we reduced the number of nonsupernova candidates by a factor of 10 while increasing our supernova identification efficiency. Methods such as these will be crucial for maintaini… more
Date: December 21, 2007
Creator: Aragon, Cecilia R.; Bailey, Stephen; Aragon, Cecilia R.; Romano, Raquel; Thomas, Rollin C.; Weaver, B. A. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Temporal Entropy Generation in the Viscous Layers of Laterally-converging Duct Flows

Description: Since insight into entropy generation is a key to increasing efficiency and thereby reducing fuel consumption and/or waste and -- for wall-bounded flows -- most entropy is generated in the viscous layer, we examine the transient behavior of its dominant contributor there for a non-canonical flow. New measurements in oil flow are presented for the effects of favorable streamwise mean pressure gradients on temporal entropy generation rates and, in the process, on key Reynolds-stress-producing eve… more
Date: December 1, 2008
Creator: McEligot, Donald M.; Brodkey, Robert S. & Eckelmann, Helmut
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Characterization of the Transient Response of the ILS with One Module Installed to Heatup Changes in Power Level and Cooldown

Description: This report provides documentation of the initial startup and testing of the first electrolysis module in the Idaho National Laboratory (INL) High Temperature Steam Electrolysis Integrated Laboratory Scale (ILS) facility. Initial shakedown testing of the INL ILS experimental facility commenced on August 22, 2007. This fulfilled a DOE Level 2 milestone. Heatup of the first ILS module started at approximately 4:10 PM on September 24, 2007. Initial module testing continued for 420 hours. The test … more
Date: December 1, 2007
Creator: Condie, K. G.; Stoots, C. M.; O'Brien, J. E. & Herring, J. S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Ultrafast Control of Magnetism in Ferromagnetic Semiconductors via Photoexcited Transient Carriers

Description: The field of spintronics offers perspectives for seamless integration of coupled and inter-tunable electrical and magnetic properties in a single device. For integration of the spin degree of freedom with current electronic technology, new semiconductors are needed that show electrically-tunable magnetic properties at room temperature and above. Dilute magnetic semiconductors derived from III-V compounds, like GaMnAs and InMnAs, show coupled and tunable magnetic, transport, and optical properti… more
Date: December 12, 2008
Creator: Cotoros, Ingrid A.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries Government Documents Department
open access

Response of variable impedance stripline to pulse excitation

Description: We describe a simple method to predict the transient response of variable impedance stripline to pulse excitation. The method uses a finite difference based, quasi-static impedance formulation to calculate the reflection coefficient at each point along the direction of pulse propagation and the subsequent short pulse behavior of a variable impedance structure. A Fortran computer program is written to determine the quasi-static impedance. Excellent agreement of better than 1% between the finite … more
Date: December 15, 1984
Creator: McWright, G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Simplified containment event tree analysis for the Sequoyah Ice Condenser containment

Description: An evaluation of a Pressurized Water Reactor (PWR) ice condenser containment was performed. In this evaluation, simplified containment event trees (SCETs) were developed that utilized the vast storehouse of information generated by the NRC's Draft NUREG-1150 effort. Specifically, the computer programs and data files produced by the NUREG-1150 analysis of Sequoyah were used to electronically generate SCETs, as opposed to the NUREG-1150 accident progression event trees (APETs). This simplificatio… more
Date: December 1, 1990
Creator: Galyean, W. J.; Schroeder, J. A. & Pafford, D. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Preliminary tests of overburden material filtration and capture bag concept: Phase II

Description: The experimental work described in this report was performed to provide test data for the Nuclear Emergency Search Team (NEST) Damage Limitation Working Group. These tests extended our previous test results of shock absorption and aerosol filtration under transient air-flow conditions. Two types of experiments were run using two separate apparatus. Nylon fabric capture bags were structurally tested on a small shock tube similar to the shock tube used in the Phase I tests but capable of higher-p… more
Date: December 1, 1981
Creator: Horak, H. L.; Gregory, W. S.; Smith, P. R. & Grothus, H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Initial Estimate of Transmission Line Effects in SSC Design D Magnets

Description: The response of the SSC accelerator magnet string to transient excitation from the power supply is considered. Some criteria for the selection of the optimum damping resistors for the SSC magnets are discussed. Once the damping resistors are chosen, the transient response of the load to power supply transients, including the effect of the power supply filter is analyzed. A comparative analysis is made of the differences between two possible configurations in the distribution of the magnets (wit… more
Date: December 1, 1985
Creator: Calvo, O. & Tool, G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Assessment of modelling needs for safety analysis of current HTGR concepts

Description: In view of the recent shift in emphasis of the DOE/Industry HTGR development efforts to smaller modular designs it became necessary to review the modelling needs and the codes available to assess the safety performance of these new designs. This report provides a final assessment of the most urgent modelling needs, comparing these to the tools available, and outlining the most significant areas where further modelling is required. Plans to implement the required work are presented. 47 refs., 20… more
Date: December 1, 1985
Creator: Kroeger, P. G. & Van Tuyle, G. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Flow in geothermal wells. Part IV. Transition criteria for two-phase flow patterns

Description: Detailed considerations justifying the criteria for transitions between flow patterns are presented. The following are covered: transition from bubble to plug (or slug) flow, transition from plug flow to froth flow, transition from froth to annular mist flow, and model comparisons. (MHR)
Date: December 1, 1980
Creator: Bilicki, Z. & Kestin, J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Hydraulic transients for loss of coolant accidents

Description: This paper discusses calculations related to hydraulics in a loss of coolant reactor accident. Earlier calculations ignored the effect of emergency coolant injection. Present results show that if the ECS flow is considered, reactor coolant flow is maintained for much longer periods. A computer program used to carry out the calculations is included in this report. (JDH)
Date: December 19, 1986
Creator: Hinton, J H
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Characteristics of identifying linear dynamic models from impulse response data using Prony analysis

Description: The purpose of the study was to investigate the characteristics of fitting linear dynamic models to the impulse response of oscillatory dynamic systems using Prony analysis. Many dynamic systems exhibit oscillatory responses with multiple modes of oscillations. Although the underlying dynamics of such systems are often nonlinear, it is frequently possible and very useful to represent the system operating about some set point with a linear model. Derivation of such linear models can be done usin… more
Date: December 1, 1992
Creator: Trudnowski, D.J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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