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Effects of Particulate Debris Morphology on the Rolling Wear Behavior of All-Steel and Si(Sub 3)N(Sub 4)-Steel Bearing Element Couples
Rolling contact fatigue experiments were performed on all-steel and hybrid Si{sub 3}N{sub 4}-M50 steel rolling bearing systems using particulate contaminated lubricants. The particulate contaminants used were glycothermally synthesized {alpha}-Al{sub 2}O{sub 3} platelets or Arizona test dust. The effects of contaminant composition and morphology on rolling contact fatigue and wear behavior were explored. The effects of bearing element material properties on fatigue and wear behavior were also examined. Rolling wear behavior is related to bearing component material configuration and the type of particulate contaminant present in the lubricant. Component and particulate material properties such as hardness and elastic modulus are observed to affect rolling wear behavior. Wear mechanisms such as contact stress fatigue, indenting, cutting and plowing are observed.
Date:
January 25, 1999
Creator:
Adair, J.H.; Mecholsky, J.J., Jr. & Mitchell, D.J.
Object Type:
Article
System:
The UNT Digital Library
CENRTC Project {number_sign}2F3EOA, OCB A-376, acceptance test procedure
This test procedure provides the steps necessary to verify correct functional operation of controls, annunciators, alarms, protective relays and related systems impacted by CENRTC {number_sign}2F3E0A, Microwave Transfer Trip Project, modification work performed under work package 6B-93-00041/M. This procedure separates three tests into separate sections: energization of A-376 duplex panel and circuits; SCADA tests; and A-376 local trip tests.
Date:
January 25, 1995
Creator:
Akerson, A. W.
Object Type:
Report
System:
The UNT Digital Library
Novel reactor configuration for synthesis gas conversion to alcohols
Our objectives during this quarter was to complete studies on the kinetics of methanol synthesis reaction in the slurry reactor with long periods of on stream studies, start experimentation in the trickle bed reactor assembly, investigate simulation studies using the piston-exchange (PE) and piston-dispersion-exchange (PDE) models, and introduce water gas shift reaction as the second reaction in our simulation studies.
Date:
January 25, 1992
Creator:
Akgerman, A. & Anthony, R. G.
Object Type:
Report
System:
The UNT Digital Library
Novel reactor configuration for synthesis gas conversion to alcohols. Quarterly report, October 1, 1991--December 31, 1991
Our objectives during this quarter was to complete studies on the kinetics of methanol synthesis reaction in the slurry reactor with long periods of on stream studies, start experimentation in the trickle bed reactor assembly, investigate simulation studies using the piston-exchange (PE) and piston-dispersion-exchange (PDE) models, and introduce water gas shift reaction as the second reaction in our simulation studies.
Date:
January 25, 1992
Creator:
Akgerman, A. & Anthony, R. G.
Object Type:
Report
System:
The UNT Digital Library
The Boerne Star (Boerne, Tex.), Vol. 91, No. 4, Ed. 1 Wednesday, January 25, 1995
Weekly newspaper from Boerne, Texas that includes local, state, and national news along with advertising.
Date:
January 25, 1995
Creator:
Aldridge, Leon
Object Type:
Newspaper
System:
The Portal to Texas History
The Oklahoma Daily (Norman, Okla.), Vol. 83, No. 90, Ed. 1 Monday, January 25, 1999
Student newspaper of the University of Oklahoma in Norman, Oklahoma that includes national, local, and campus news along with advertising.
Date:
January 25, 1999
Creator:
Allam, Heather
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Optical Properties of InGaAsN: A New 1eV Bandgap Material System
InGaAsN is a new semiconductor alloy system with the remarkable property that the inclusion of only 2% nitrogen reduces the bandgap by more than 30%. In order to help understand the physical origin of this extreme deviation from the typically observed nearly linear dependence of alloy properties on concentration, we have investigated the pressure dependence of the excited state energies using both experimental and theoretical methods. We report measurements of the low temperature photohnninescence energy of the material for pressures between ambient and 110 kbar. We describe a simple, density-functional-theory-based approach to calculating the pressure dependence of low lying excitation energies for low concentration alloys. The theoretically predicted pressure dependence of the bandgap is in excellent agreement with the experimental data. Based on the results of our calculations, we suggest an explanation for the strongly non-linear pressure dependence of the bandgap that, surprisingly, does not involve a nitrogen impurity band. Addhionally, conduction-band mass measurements, measured by three different techniques, will be described and finally, the magnetoluminescence determined pressure coefficient for the conduction-band mass is measured.
Date:
January 25, 1999
Creator:
Allerman, A. A.; Fritz, I. J.; Jones, E. D.; Kurtz, S. R.; Modine, N. A.; Tozer, S. T. et al.
Object Type:
Article
System:
The UNT Digital Library
An Investigation of Cross-Borehole Ground Penetrating Radar Measurements for Characterizing the 2D Moisture Content Distribution in the Vadose Zone
The use of cross-borehole ground penetrating radar (GPR) imaging for determining g the two dimensional (2D) in situ moisture content distribution within the vadose zone is being investigated. The ultimate goal is to use the GPR images as input to a 2D hydrologic inversion scheme for recovering the van Genuchten parameters governing unsaturated ,hydraulic flow. Initial experiments conducted on synthetic data have shown that at least in theory, cross-borehole GPR measurements can provide realistic estimates of the spatial variation in moisture content that are needed for this type of hydrologic inversion scheme. However, the method can not recover exact values of moisture content due to the break down of the empirical expression often employed to convert GPR velocity images to moisture content, and to the smearing nature of the imaging algorithm. To test the applicability of this method in a real world environment cross- borehole GPR measurements were made at a hydrologic/geophysical vadose zone test site in Socorro, New Mexico. Results show that the GPR images compare well with the uncalibrated borehole neutron log data. GPR data acquisition will continue once an infiltration test has started, and the results from these measurements will be employed in a 2D hydrologic inverse …
Date:
January 25, 1999
Creator:
Alumbaugh, D. & Paprocki, L.
Object Type:
Article
System:
The UNT Digital Library
Bench scale testing of micronized magnetite beneficiation. Quarterly technical progress report 4, October--December, 1993
This project is aimed at development of a process that, by using ultra fine magnetite suspension, would expand the application of heavy media separation technology to processing fine, {minus}28 mesh coals. These coal fines, produced during coal mining and crushing, are separated in the conventional coal preparation plant and generally impounded in a tailings pond. Development of an economic process for processing these fines into marketable product will expand the utilization of coal for power production in an environmentally acceptable and economically viable way. This process has been successfully researched at PETC but has not been studied on a continuous bench-scale unit, which is a necessary step towards commercial development of this promising technology. The goal of the program is to investigate the technology in a continuous circuit at a reasonable scale to provide a design basis for larger plants and a commercial feasibility data.
Date:
January 25, 1994
Creator:
Anast, K.
Object Type:
Report
System:
The UNT Digital Library
Prediction of the Inert Strength Distribution of Si3N4 Diesel Valves
Censored Weibull strength distributions were generated with NT551 silicon nitride four-point flexure data using the ASTM C1161-B and 5.0 mm diameter cylindrical specimens. Utilizing finite element models and AlliedSignal's life prediction codes, the inert or fast fracture strength failure probability of a ceramic diesel valve was estimated from these data sets. The failure probability prediction derived from each data set were found to be more conservative than valve strength data. Fractographic analysis of the test specimens and valves showed that the cylindrical specimens failed from a different flaw population than the prismatic flexure bars and the valves. The study emphasizes the prerequisite of having coincident flaw populations homogeneously distributed in both the test specimen and the ceramic component. Lastly, it suggests that unless material homogeneity exists, that any meaningful life prediction or reliability analysis of a component may not be possible.
Date:
January 25, 1999
Creator:
Andrews, M. J.; Breder, K. & Wereszczak, A. A.
Object Type:
Article
System:
The UNT Digital Library
[Photograph 2012.201.B0308B.0213]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Lauro and trainer Greg Jarrell take a breather from morning training activities."
Date:
January 25, 1990
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0309B.0415]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Amber Thompson of Norman Longfellow makes her way around Ardmore's Shelly Jackson during first round of action of the Norman Whittier seventh-grade basketball tournament."
Date:
January 25, 1990
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0409.1024]
Photograph used for a newspaper owned by the Oklahoma Publishing Company.
Date:
January 25, 1991
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0935.0164]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Charlie Nicholson blows lint from a record at his music shop, Charlie's Jazz & Rhythm & Blues Record Store, the home of 10,000 long-playing (LPs) and more than 700 of the 78 rpm records from past recording artists."
Date:
January 25, 1993
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0935.0165]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "The Johnny Griffith album is worth $50, and record-album covers from jazz artist line the walls at Charlie Nicholson's shop."
Date:
January 25, 1993
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0935.0166]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "The Johnny Griffith album is worth $50, and record-album covers from jazz artist line the walls at Charlie Nicholson's shop."
Date:
January 25, 1993
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0935.0167]
Photograph used for a newspaper owned by the Oklahoma Publishing Company. Caption: "Customers look at old records at Charlie's Jazz & Rhythm & Blues Record Store."
Date:
January 25, 1993
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0935.0168]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Music can be heard from more than just the records. (record store owner Charlie Nicholson)"
Date:
January 25, 1993
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0987.1160]
Photograph used for a newspaper owned by the Oklahoma Publishing Company.
Date:
January 25, 1990
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B0987.1161]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Kory Owens, who has 13 horses on the grounds, should make the trainer standings interesting at Remington Park."
Date:
January 25, 1990
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B1072.0417]
Photograph used for a newspaper owned by the Oklahoma Publishing Company.
Date:
January 25, 1990
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B1156.0550]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "At the pulpit in Clinton's First Church of God, the Rev. Lawrence B. Scott prepares his sermon for today. The annual service celebrates his birthday, and on Monday, he will be 104 years old."
Date:
January 25, 1995
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B1283.0301]
Photograph used for a story in the Daily Oklahoman newspaper. Caption: "Hundreds of stuffed animals, mounds of flower wreaths, ribbons, cards, letters and clothing left on the fence around the Murrah Building site are being inventoried and saved by the Oklahoma Historical Society."
Date:
January 25, 1996
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History
[Photograph 2012.201.B1349.0851]
Photograph used for a newspaper owned by the Oklahoma Publishing Company. Caption: "War, Persian Gulf, Operation Desert Storm, Support Rally, Sandy Newton of Edmond is supporting her brother Army soldier Douglas Newton who has been in Saudi since Oct. 17 1991."
Date:
January 25, 1991
Creator:
Argo, Jim
Object Type:
Photograph
System:
The Gateway to Oklahoma History