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in subjects: "Bearings"

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Porous graphite air-bearing components as applied to machine tools

No Description Available.

Date: January 1, 1974

Creator: Rasnick, W. H.; Arehart, T. A.; Littleton, D. E. & Steger, P. J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Ceramic technology for Advanced Heat Engines Project

Significant accomplishments in fabricating ceramic components for advanced heat engine programs have provided evidence that the operation of ceramic parts in high-temperature engine environments is feasible. However, these programs have also demonstrated that additional research is needed in materials and processing development, design methodology, and database and life prediction before industry will have a sufficient technology base from which to produce reliable cost-effective ceramic engine… more

Date: July 1, 1991

Creator: Johnson, D. R.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Superconductivity: Past, present, and future

This paper provides an overview of superconductor research and development activities, with emphasis on the potential of high-{Tc} materials for future applications. Superconductor applications are grouped under the following categories: electronics/instrumentation, bulk material/castings, research devices, industrial/commercial, electric power, and transportation/propulsion. Near-term applications are typically based on thin film and cast forms of high-{Tc} materials, while large-scale applica… more

Date: January 1, 1992

Creator: Uherka, K.L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Recent advances in high-temperature superconductor wire fabrication and applications development

In this paper, recent advances in fabrication of HTS wires are summarized, and detailed discussion is provided for developments in near- and intermediate-term applications. Near-term applications, using presently obtainable current densities, include: liquid-nitrogen depth sensors, cryostat current leads, and magnetic bearings. Intermediate-term applications, using current densities expected to be available in the near future include fault-current limiters and short transmission lines. 25 refs.

Date: January 1, 1992

Creator: Hull, J.R. & Uherka, K.L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Evaluation of selected drive components for a flywheel powered commuter vehicle. Phase I. Final report

The results of tests performed to evaluate the performance of selected high-speed flywheel bearings and shaft seals are reported, and work performed on the development of a high-speed composite flywheel rotor is described. The overall program objective is to develop a composite flywheel system for primary energy storage in a flywheel powered vehicle. These initial tests were intended to evaluate the performance of full-size composite rotor elements, high-speed bearings and shaft seals for that … more

Date: June 30, 1977

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Geothermal drilling and completion technology development program. Quarterly progress report, January-March 1980

The progress, status, and results of ongoing Research and Development (R and D) within the Geothermal Drilling and Completion Technology Development Program are described. The program emphasizes the development of geothermal drilling hardware, drilling fluids, completion technology, and lost circulation control methods. Advanced drilling systems are also under development. The goals of the program are to develop the technology required to reduce well costs by 25% by 1983 and by 50% by 1987.

Date: April 1, 1980

Creator: Varnado, S.G. (ed.)

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Mechanical tests for validation of seismic isolation elastomer constitutive models

High damping laminated elastomeric bearings are becoming the preferred device for seismic isolation of large buildings and structures, such as nuclear power plants. The key component of these bearings is a filled natural rubber elastomer. This material exhibits nonlinear behavior within the normal design range. The material damping cannot be classified as either viscous or hysteritic, but it seems to fall somewhere in between. This paper describes a series of tests that can be used to character… more

Date: January 1, 1992

Creator: Kulak, R.F. & Hughes, T.H.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Geothermal drilling and completion technology development program. Quarterly progress report, April-June 1980

The progress, status, and results of ongoing research and development (R and D) within the Geothermal Drilling and Completion Technology Development Program are reported. The program emphasizes the development of geothermal drilling hardware, drilling fluids, completion technology, and lost circulation control methods. Advanced drilling systems are also under development. The goals of the program are to develop the technology required to reduce well costs by 25% by 1983 and by 50% by 1987.

Date: July 1, 1980

Creator: Varnado, S. G.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Geothermal drilling ad completion technology development program. Semi-annual progress report, April-September 1979

The progress, status, and results of ongoing Research and Development (R and D) within the Geothermal Drilling and Completion Technology Development Program are described. The program emphasizes the development of geothermal drilling hardware, drilling fluids, and completion technology. Advanced drilling systems are also under development. The goals of the program are to develop the technology required to reduce well costs by 25% by 1982 and by 50% by 1986.

Date: May 1, 1980

Creator: Varnado, S.G. (ed.)

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Dragline roller track improvement. Volume 2. Field measurement of dragline roller circle loading. Final report, September 30, 1976-July 30, 1980

The period from September 1977 to September 1978 covered laboratory rolling contact rig tests to evaluate typical low hardness dragline track materials. The results of this work are covered by DOE/ET/9121-1 Final Report, Volume I. The period from September 1978 to July 1980 covered field measurements of dragline roller circle loadings. The results of this work are covered by DOE/ET/9121-2 Final Report, Volume II. During May 1979, a field test group visited the Beltona Mines in Warrior, Alabama,… more

Date: January 1, 1980

Creator: Gambs, G.; Tuft, R.; Yankanich, J. & Rumbarger, J.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Dragline roller track improvement. Volume I. Evaluation of low hardness dragline track materials in rolling contact. Final report, September 30, 1976-July 30, 1980

The Franklin Research Center (FRC), a Division of the Franklin Institute, was contracted by the Bureau of Mines to improve walking dragline roller tracks. The contract was subsequently transferred to the Department of Energy. The period from September 1977 to September 1978 covered laboratory rolling contact rig tests to evaluate typical low hardness dragline track materials. The results of this work are covered by DOE/ET/9121-1 Final Report, Volume I. The period from September 1978 to July 198… more

Date: January 1, 1980

Creator: Dunfee, J.; Leonard, L. & Rumbarger, J.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Materials and lubrication for gear and bearing surfaces in uhv

During design and construction of the SLAC polarized LEED (PLEED) system, a search was made for a dependable gear, bearing, and lubrication system for the computer-controlled Faraday cup used to measure diffracted beams. Components must be nonmagnetic, bakeable to 250/sup 0/C, and at room temperature must operate at pressures in the 10/sup -9/ to 10/sup -10/ Pa range. A test system was constructed which incorporated a meshed pair of dissimilar pitch diameter spur gears, one of which was confine… more

Date: June 1, 1980

Creator: Kirby, R. E.; Collet, G. J. & Garwin, E. L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Status of Rankine-cycle technology for space nuclear power applications

A substantial effort on the development of the liquid metal Rankine cycle space nuclear power system was carried out in programs jointly sponsored by the National Aeronautics and Space Administration (NASA) and the Atomic Energy Commission (AEC) during the period of 1960--1972. Component tests were conducted which have established a considerable technology base for the concept. The development effort and technology status of each component are presented. The key technology issues remaining for … more

Date: January 1, 1991

Creator: Holcomb, R.S.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Field Drilling Tests on Improved Geothermal Unsealed Roller-Cone Bits. Final Report

The development and field testing of a 222 mm (8-3/4 inch) unsealed, insert type, medium hard formation, high-temperature bit are described. Increased performance was gained by substituting improved materials in critical bit components. These materials were selected on bases of their high temperature properties, machinability and heat treatment response. Program objectives required that both machining and heat treating could be accomplished with existing rock bit production equipment. Six of th… more

Date: May 1, 1980

Creator: Hendrickson, R. R.; Jones, A. H.; Winzenried, R. W. & Maish, A. B.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Development of a Numerical Simulator for Analyzing the Geomechanical Performance of Hydrate-Bearing Sediments

In this paper, we describe the development and application of a numerical simulator that analyzes the geomechanical performance of hydrate-bearing sediments, which may become an important future energy supply. The simulator is developed by coupling a robust numerical simulator of coupled fluid flow, hydrate thermodynamics, and phase behavior in geologic media (TOUGH+HYDRATE) with an established geomechanical code (FLAC3D). We demonstrate the current simulator capabilities and applicability for … more

Date: June 1, 2008

Creator: Rutqvist, Jonny; Rutqvist, J. & Moridis, G.J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

A Novel Treatment for Acid Mine Drainage Utilizing Reclaimed Limestone Residual

The viability of utilizing Reclaimed Limestone Residual (RLR) to remediate Acid Mine Drainage (AMD) was investigated. Physical and chemical characterization of RLR showed that it is composed of various minerals that contain significant quantities of limestone or calcium bearing compounds that can be exploited for acid neutralization. Acid Neutralization Potential (ANP) test results showed that RLR has a neutralization potential of approximately 83% as calcium carbonate (CaCO{sub 3}). Neutraliza… more

Date: August 31, 2004

Creator: Moo-Young, Horace K. & Ochola, Charles E.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

M5Si3(M=Ti, Nb, Mo) Based Transition-Metal Silicides for High Temperature Applications

Transition metal silicides are being considered for future engine turbine components at temperatures up to 1600 C. Although significant improvement in high temperature strength, room temperature fracture toughness has been realized in the past decade, further improvement in oxidation resistance is needed. Oxidation mechanism of Ti{sub 5}Si{sub 3}-based alloys was investigated. Oxidation behavior of Ti{sub 5}Si{sub 3}-based alloy strongly depends on the atmosphere. Presence of Nitrogen alters th… more

Date: December 1, 2007

Creator: Tang, Zhihong

Item Type: Thesis or Dissertation

Partner: UNT Libraries Government Documents Department

open access

Carbon Capture and Storage

Carbon capture and sequestration (CCS) is the long-term isolation of carbon dioxide from the atmosphere through physical, chemical, biological, or engineered processes. This includes a range of approaches including soil carbon sequestration (e.g., through no-till farming), terrestrial biomass sequestration (e.g., through planting forests), direct ocean injection of CO{sub 2} either onto the deep seafloor or into the intermediate depths, injection into deep geological formations, or even direct … more

Date: October 3, 2007

Creator: Friedmann, S.

Item Type: Book

Partner: UNT Libraries Government Documents Department

open access

Using Carbon Dioxide to Enhance Recovery of Methane from Gas Hydrate Reservoirs: Final Summary Report

Carbon dioxide sequestration coupled with hydrocarbon resource recovery is often economically attractive. Use of CO2 for enhanced recovery of oil, conventional natural gas, and coal-bed methane are in various stages of common practice. In this report, we discuss a new technique utilizing CO2 for enhanced recovery of an unconventional but potentially very important source of natural gas, gas hydrate. We have focused our attention on the Alaska North Slope where approximately 640 Tcf of natural g… more

Date: September 1, 2007

Creator: McGrail, B. Peter; Schaef, Herbert T.; White, Mark D.; Zhu, Tao; Kulkarni, Abhijeet S.; Hunter, Robert B. et al.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

ISOLEUCYL-tRNA-SYNTHETASE A FLUORESCENCE STUDY OP THE BINDINGPROPERTIES OF THE SYNTHETASE FROM ESCHERICHIA COLI

Fluorescence properties of purified isoleucyl-tRNA-synthetase isolated from E. coli B have been studied. No changes in the quantum yield, energy or polarization of the emission were detected in the presence (either individually or in combinations) of the substrates and cofactors required for activation of L-isoleucine. In 2.5 M urea enzyme activity and intrinsic fluorescence intensity (at 340 nm) each decrease with time, showing similar kinetics and rate constants. The rate of this decay is red… more

Date: November 1, 1970

Creator: Penzer, Geoffrey R.; Bennett, Edward L. & Calvin, Melvin.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Technical specifications for the successful fabrication of laminated seismic isolation bearings

High damping laminated elastomeric bearings are becoming one of the preferred devices for isolating large buildings and structures. IN the United States, the current reference design for the Advanced Liquid Metal Reactor uses laminated bearings for seismic isolation. These bearing are constructed from alternating layers of rubber and steel plates. They are typically designed for shear strains between 50 to 100 percent and expected to sustain two to three times these levels for beyond design bas… more

Date: January 1, 1992

Creator: Kulak, R.F.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Summary of experimental tests of elastomeric seismic isolation bearings for use in nuclear reactor plants

This paper describes an experimental test program for isolator bearings which was developed to help establish the viability of using laminated elastomer bearings for base isolation of nuclear reactor plants. The goal of the test program is to determine the performance characteristics of laminated seismic isolation bearings under a wide range of loadings. Tests were performed on scale-size laminated seismic isolators both within the design shear strain range to determine the response of the bear… more

Date: January 1, 1992

Creator: Seidensticker, R.W.; Chang, Y.W. & Kulak, R.F.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Seismic base isolation: Elastomer characterization, bearing modeling and system response

This paper discusses several major aspects of seismic base isolation systems that employ laminated elastomer bearings. Elastomer constitutive models currently being used to represent the nonlinear elastic and hysteretic behavior are discussed. Some aspects of mechanical characterization testing of elastomers is presented along with representative tests results. The development of a finite element based mesh generator for laminated elastomer bearings is presented. Recent advances in the simulati… more

Date: January 1, 1991

Creator: Kulak, R. F.; Wang, C. Y. & Hughes, T. H.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Active feedback control for stabilization of vibration in rotating machinery (24. 034). Period covered: April 1-June 30, 1980

Some of the considerations involved in the use of feedback control as a means of reducing the unbalanced response of a rotor or of eliminating or alleviating rotor dynamic instability are discussed. A simple model of a mass on a flexible shaft is used to illustrate the application of feedback control concepts. A description is given of a system assembled at the University of Virginia which uses feedback control individually adjustable in the vertical and horizontal directions to support the sha… more

Date: January 1, 1980

Item Type: Report

Partner: UNT Libraries Government Documents Department