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39,126 Matching Results
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Porous graphite air-bearing components as applied to machine tools
None
Date:
January 1, 1974
Creator:
Rasnick, W. H.; Arehart, T. A.; Littleton, D. E. & Steger, P. J.
Object Type:
Article
System:
The UNT Digital Library
COMP: a BASIC language nonlinear least-squares curve fitting program
COMP is an interactive nonlinear least squares routine written in BASIC language and used to obtain estimates of parameters in nonlinear functions and to approximate their associated statistical errors. The program uses the linearizing (or Taylor Series) expansion of partial derivatives outlined in Draper and Smith, (1966, pp. 267 to 270). Therefore, partial derivatives must be supplied (as well as the function) by the user for any new models not currently contained in the programs. When a linearizing method is used to estimate parameters in a nonlinear model, all the usual procedures of linear regression theory can be applied. However, the results so obtained are only valid insofar as the linearized form approximates the true model. All of the statistics computed by COMP should be viewed with this restriction in mind. The output of COMP includes the variance-covariance matrix, t-tests for parameters, Von Neumann's ratio, observed, predicted and residual values, the error mean square, and an optional procedure to evaluate heteroscedasticity.
Date:
November 1, 1977
Creator:
Thomas, J. M.; Cochran, M. I.; Watson, C. R. & Eberhardt, L. L.
Object Type:
Report
System:
The UNT Digital Library
Note on the cryostatic stability of superconducting composites
A careful discussion is given of the ''equal area condition'' developed by Maddock et al. In order to make the essential points as clear as possible, analytical solutions are derived under simplifying assumptions (simple model for heat transfer by nucleate and film boiling liquid helium; constant heat conduction and specific heat) instead of using more realistic but less controllable computer calculations. A quantitative definition of the concept of a long wire is given. Numerical examples for the Maddock transition characterized by the equal area condition are given for a long superconducting composite with linear cooling and for a liquid helium-cooled resistance wire of finite length. In addition, cases are shown where instead of applying the equal area stability condition, time-dependent solutions should be considered.
Date:
February 1, 1978
Creator:
Gauster, W. F.
Object Type:
Report
System:
The UNT Digital Library
Comparative assessment of energy-economy interactions
This analysis is concerned with the impact of energy-policy measures on the level, growth, and structure of the US economy. In particular, the nature and magnitude of the causal relationship between variations in the prices of various energy forms and economic performance, as measured by real gross national product (GNP), is studied. The combined Brookhaven National Laboratory/Dale W. Jorgenson Associates (BNL/DHA) energy-economy model system is used to determine the economic effects of three energy-price futures combined with an invariant set of energy policies. The price alternatives are intended to characterize the uncertainty that exists in the policy-planning environment. In addition, the results are compared to those obtained from another DOE-sponsored analysis which used the Data Resources, Incorporated (DRI) quarterly macroeconomic model to assess the effects of these same three cases. Significant numerical differences in the results from these modeling systems are observed and are attributed to structural differences between the two methodologies. The methodological issues emerging from this comparison have important policy implications which are independent of the specific numerical conclusions. Since it is uncertain which, if either, of the models is correct, the use of one for policy analysis entails the risk that policy will be predicated on inaccurate …
Date:
December 1, 1978
Creator:
Goettle, R.J. IV; Hudson, E.A. & Lukachinski, J.
Object Type:
Report
System:
The UNT Digital Library
Studies of photosynthetic energy conversion. Comprehensive three-year report, September 1, 1972--August 31, 1975
None
Date:
January 1, 1975
Creator:
Clayton, R. K.
Object Type:
Report
System:
The UNT Digital Library
Defects in metal crystals. Progress report, May 1, 1973--April 30, 1974
Progress was made in the following areas: FIM (field ion microscopy) studies of defects in W irradiated with W ions or electrons; FIM studies of Au irradiated with Au or Xe ions; FIM and electrical resistivity study of vacancy defects in quenched W; FIM studies of dilute Pt alloys; measurement of the range of focused replacement sequences in Au; investigation of grain boundary strtucture (using Au); FIM observation of dissociated screw dislocations in Mo; calculation of properties of point defects in metals; and atom probe FIM. (auth)
Date:
January 1, 1974
Creator:
Balluffi, R.W. & Seidman, D.N.
Object Type:
Report
System:
The UNT Digital Library
Applications of induction linac technology to heavy ion fusion
Evaluation of the application of heavy ion accelerators to ignite d-t pellets in a thermonuclear reactor is discussed. Accelerator design requirements considered include transport-limited current, beam injection conditions, and pulse bunching and focusing characteristics. The desirability of resonant and non-resonant accelerating structures is comparatively examined. The required power system switch tubes are discussed. It is concluded that heavy ion accelerators could offer a promising solution to the pellet-igniter problem. The advantages pointed out for this approach include electric efficiency greater than 10 percent, the possibility of high repetition rates (1 to 10 Hz), and a mature technological base. (RME)
Date:
July 1, 1977
Creator:
Faltens, A. & Keefe, D.
Object Type:
Article
System:
The UNT Digital Library
Development of a High Velocity Solid Particle Launcher for Laboratory Erosion Studies. [Reentry Vehicle Heat Shields]
A solid particle launcher for laboratory erosion studies has been developed and successfully demonstrated. Performance of the launcher is predicted by a two-dimensional, time-dependent theoretical analysis to within the experimental uncertainty. The present device accelerates 100 μm diameter glass spheres to velocities of 2.1+/- 0.6 km/sec. The system is safe, reliable, and has a test repetition of about 2 shots/hour.
Date:
March 1, 1975
Creator:
Aeschliman, D. P.; Mulac, A. J.; Guzman, J. A.; Eaton, R. R. & Fox, R. L.
Object Type:
Report
System:
The UNT Digital Library
Ecology of the plankton of the Chesapeake Bay. Progress report, 1 August 1974--31 July 1975. [/sup 14/C and /sup 15/N tracer studies]
None
Date:
April 1, 1975
Creator:
Taylor, W. Rowland & Taft, Jay L.
Object Type:
Report
System:
The UNT Digital Library
Sintering of polycrystalline ionic conductors:. beta. ''-Al/sub 2/O/sub 3/ and NASICON
The densification kinetics for both ..beta..''-alumina and NASICON are dramatically different. ..beta..''-Alumina sinters by a reactive liquid process whereas NASICON densifies by a solid state method. More importantly, a qualitative examination of particle and agglomerate distributions, phase composition, linear shrinkage analysis, and heating rate effects can result in a concise determination of sintering processes without recourse to more quantitative techniques. Such a simple procedural method should be a basis for any beginning investigative study into the densification mechanism of new multicomponent ceramic materials.
Date:
January 1, 1979
Creator:
McEntire, B. J.; Miller, G. R. & Gordon, R. S.
Object Type:
Article
System:
The UNT Digital Library
Solar-thermal energy conversion and storage: cyclohexane dehydrogenation. Progress report, 30 September 1977-30 June 1978
The objective of this project is to provide research support for the benzene/cyclohexane heat pipe development program at Sandia. The kinetics of the cyclohexane decomposition (energy collection) reaction over a commercially available naphtha reforming catalyst (RD-150, Englehard Industries) in the temperature range 400 to 800/sup 0/F and pressures of 1 to 40 atmospheres were measured. Significant amounts of side products such as toluene and butane were identified at temperatures above 550/sup 0/F at atmospheric pressure and significant mass transfer limitations on conversions were observed at the higher space velocities and higher temperatures. No significant decreases in catalyst activity were measured at temperatures below 800/sup 0/F. However, at 800/sup 0/F there was a significant decrease in catalyst activity which does not appear to be a poisoning problem but a thermal limitation on catalyst effectiveness. A test facility has been fabricated to study the behavior of the benzene/cyclohexane (or any other gas phase catalytic reaction) system and its catalysts under long term cycling at temperatures up to 1000/sup 0/F, and pressures up to 1000 psig at a wide variety of space velocities. A mathematical model was developed which simulates the dynamic behavior of the collector (endothermic) reactor and allows the evaluation of …
Date:
July 1, 1978
Creator:
Ritter, A.B.; DeLancey, G.B.; Schneider, J. & Silla, H.
Object Type:
Report
System:
The UNT Digital Library
Geothermal resources in California: the problems and the potential
The report is presented under the following section headings: introduction; conclusions and recommendations; legislative activity in 1973; United Nations Geothermal Conference; International Geothermal Conference--1975; National Conference on Geothermal Energy, May 10--11, Palm Springs, Calif.; Imperial Valley field trip and joint interim hearing October 16--17, 1973 (Senate Committee on Natural Resources and Wildlife on Senate Bill 577 in San Diego); hearing of the Subcommittee on Geothermal Resources and the Senate Committee on Public Utilities and Corporations, Nov. 12, 1973 in San Francisco (public access to steam at The Geysers); hearing of the Senate Committee on Natural Resources and Wildlife on the continued availability of natural gas and other sources of energy, Nov. 15, 1973, in Martinez, Calif; and Appendix. (JGB)
Date:
January 1, 1973
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Tumor production in Syrian hamsters following inhalation of PuO/sub 2/--ZrO/sub 2/ aerosol
Syrian golden hamsters of both sexes were exposed to aerosols of ZrO/sub 2/ containing PuO/sub 2/. The starting material in the aerosol generator also had a small amount of /sup 57/Co added as a tracer. The mixture of all three constituents was nebulized and the droplets passed through a heating column at 1000/sup 0/C. Aerosol sampling was accomplished with a cascade impactor and electrostatic precipitator. The median aerodynamic diameters in all inhalation runs were approximately 2 ..mu..m with a geometric standard deviation of 2. One exposed group of 60 hamsters had 6-day lung burdens averaging 100 nCi. This group had a lung tumor incidence of 44% with an even distribution of adenomas and carcinomas. Two other groups had average 6-day lung burdens of 80 to 90 nCi plus 55 nCi of intravenously injected spheres localized in the lung. These animals had tumor incidences of approximately 30%.
Date:
January 1, 1978
Creator:
Thomas, R. G. & Smith, D. M.
Object Type:
Article
System:
The UNT Digital Library
Radon alpha-track survey of a potential geothermal resource area. [Buffalo Valley, Nevada]
None
Date:
October 1, 1974
Creator:
Wollenberg, H.A.
Object Type:
Report
System:
The UNT Digital Library
Preliminary analyses of soils and vegetation in the vicinity of the Mohave Generating Station in southern Nevada
None
Date:
April 1, 1975
Creator:
Turner, F. B.; Romney, E. M.; Logan, R. F.; Leavitt, V. D.; Ackerman, T. L.; Alexander, G. V. et al.
Object Type:
Report
System:
The UNT Digital Library
Redox reactions involving chromium, plutonium, and manganese in soils
Plutonium speciation in soils is discussed. Chromium was selected as a model for studying soil Pu. Similarities between Cr and Pu are pointed out, and a hypotheses concerning Pu speciation in soils is presented. Findings from Cr oxidation studies that may be relevant to the problem of Pu oxidation in soils are discussed. (JGB)
Date:
January 1, 1979
Creator:
Amacher, M.C. & Baker, D.E.
Object Type:
Report
System:
The UNT Digital Library
Video monitoring system for enriched uranium casting furnaces
A closed-circuit television (CCTV) system was developed to upgrade the remote-viewing capability on two oralloy (highly enriched uranium) casting furnaces in the Y-12 Plant. A silicon vidicon CCTV camera with a remotely controlled lens and infrared filtering was provided to yield a good-quality video presentation of the furnace crucible as the oralloy material is heated from 25 to 1300/sup 0/C. Existing tube-type CCTV monochrome monitors were replaced with solid-state monitors to increase the system reliability.
Date:
March 1, 1978
Creator:
Turner, P. C.
Object Type:
Report
System:
The UNT Digital Library
Stress corrosion cracking of uranium--niobium alloys
The stress corrosion cracking behavior of U-2/sup 1///sub 4/, 4/sup 1///sub 2/, 6 and 8 wt % Nb alloys was evaluated in laboratory air and in aqueous Cl/sup -/ solutions. Thresholds for crack propagation were obtained in these environments. The data showed that Cl/sup -/ solutions are more deleterious than air environments. Tests were also conducted in pure gases to identify the species in the air responsible for cracking. These data showed the primary stress corrodent is water vapor for the most reactive alloy, U-2/sup 1///sub 4/% Nb, while O/sub 2/ is primarily responsible for cracking in the more corrosion resistant alloys, U-6 and 8% Nb. The 4/sup 1///sub 2/% alloy was found to be susceptible in both H/sub 2/O and O/sub 2/ environments.
Date:
March 1, 1978
Creator:
Magnani, N.J.
Object Type:
Report
System:
The UNT Digital Library
Selected constituents in the smoke of domestic low tar cigarettes
Thirty-two brands of domestic commercial low tar and nicotine cigarettes were analyzed for their production of tar, nicotine, nitrogen oxides (as nitric oxide), hydrogen cyanide, acrolein, carbon monoxide and carbon dioxide under standard analytical smoking conditions. Results are compared with published data for certain brands.
Date:
December 1, 1977
Creator:
Griest, W. H.; Quincy, R. B. & Guerin, M. R.
Object Type:
Report
System:
The UNT Digital Library
/sup 16/O + /sup 40/Ca inelastic scattering and the elastic scattering wave function
The /sup 16/O + /sup 40/Ca inelastic scattering has been measured at 60-MeV incident energy, and evidence has been found in support of an explicit coupling between direct and elastic channels. The measurements were extended over a large angular range and in particular to very forward angles. The ratio of cross sections between extreme forward and backward angles proved very useful in studying the underlying reaction mechanism.
Date:
January 1, 1977
Creator:
Rehm, K.E.; Henning, W.; Erskine, J.R. & Kovar, D.G.
Object Type:
Article
System:
The UNT Digital Library
TNS Doublet tokamak ohmic-heating power supply study
Separate abstracts were prepared for each of the six included sections. (MOW)
Date:
January 1, 1978
Creator:
Rogers, J.D. (comp.)
Object Type:
Report
System:
The UNT Digital Library
Pilot plant test plan, Task IX: technical support. Industrial Low-Btu Fuel Gas Demonstration-Plant Program
The objective of the AAG pilot plant operation is to provide process data for the gasification and related sections of the demonstration plant. Since the pilot plant will not operate at the actual pressure of the demonstration plant, it is planned to perform tests at two different pressures to obtain a sound basis for pressure scale-up. Other objectives are listed briefly.
Date:
January 1, 1978
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Effects of light intensity and PH on photosynthesis in Elodea densa
None
Date:
August 1, 1975
Creator:
Weber, J.A. & Gates, D.M.
Object Type:
Article
System:
The UNT Digital Library
Intermediate-depth geothermal temperature study. Gradient holes: 11-33 and 63-33, Soda Lake, NV
During 1979, Chevron Resources Company drilled two 2000 ft holes near Soda Lake in the Nevada Carson Sink area to obtain subsurface data for inclusion in the US Department of Energy's Northern Basin and Range geothermal reservoir assessment program. Drilling information together with detailed lithologic, geophysical and temperature log data were compiled for each hole and is summarized in this report. Maximum stabilized temperatures of 297/sup 0/F and 367/sup 0/F were encountered at total depth in each of the holes, respectively.
Date:
October 1, 1979
Creator:
Hill, D.G.
Object Type:
Report
System:
The UNT Digital Library