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369 Matching Results
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Scale effects in sliding friction: An experimental study
Solid friction is considered by some to be a fundamental property of two contacting materials, while others consider it to be a property of the larger tribosystem in which the materials are contained. A set of sliding friction experiments were designed to investigate the hypothesis that the unlubricated sliding friction between two materials is indeed a tribosystems-related property and that the relative influence of the materials properties or those of the machine on friction varies from one situation to another. Three tribometers were used: a friction microprobe (FMP), a typical laboratory-scale reciprocating pin-on-flat device, and a heavy-duty commercial wear tester. The slider material was stainless steel (AISI 440C) and the flat specimen material was an ordered alloy of Ni{sub 3}Al (IC-50). Sphere-on-flat geometry was used at ambient conditions and at normal forces ranging from 0.01 N to 100 N and average sliding velocities of 0.01 to 100.0 mm/s. The nominal, steady-state sliding friction coefficient tended to decrease with increases in normal force for each of the three tribometers, and the steady state value of sliding friction tended to increase as the mass of the machine increased. The variation of the friction force during sliding was also a characteristic of the …
Date:
July 24, 1991
Creator:
Blau, P.J.
Object Type:
Article
System:
The UNT Digital Library
Full-Scale Demonstration Low-NOx Cell Burner retrofit
The overall objective of the Full-Scale Low-NOx Cell (LNC) Burner Retrofit project is to demonstrate the cost-effective reduction of NOx generated by a large, base-loaded (70% capacity factor or greater), coal-fired utility boiler. Specific objectives include: at least 50% NOx reduction over standard two-nozzle cell burners, without degradation of boiler performance or life; acquire and evaluate emission and boiler performance data before and after the retrofit to determine NOx reduction and impact on overall boiler performance; and demonstrate that the LNC burner retrofits are the most cost-effective alternative to emerging, or commercially- available NOx control technology for units equipped with cell burners. The focus of this demonstration is to determine maximum NOx reduction capabilities without adversely impacting plant performance, operation and maintenance.
Date:
May 24, 1991
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Theory-based transport simulations of TFTR L-mode temperature profiles
The temperature profiles from a selection of TFTR L-mode discharges are simulated with the 1-1/2-D BALDUR transport code using a combination of theoretically derived transport models, called the Multi-Mode Model. The present version of the Multi-Mode Model consists of effective thermal diffusivities resulting from trapped electron modes and ion temperature gradient ({eta}{sub i}) modes, which dominate in the core of the plasma, together with resistive ballooning modes, which dominate in the periphery. Within the context of this transport model and the TFTR simulations reported here, the scaling of confinement with heating power comes from the temperature dependence of the {eta}{sub i} and trapped electron modes, while the scaling with current comes mostly from resistive ballooning modes. 24 refs., 16 figs., 3 tabs.
Date:
October 24, 1991
Creator:
Bateman, G.
Object Type:
Report
System:
The UNT Digital Library
The effect of yield strength on side-bonding upset welds
During the course of 9{degree} tapered side-bonding resistance upset weld development at Mound, various studies have been conducted to evaluate the effect of yield strength on welds in 304L stainless steel. The results of these studies have concluded that at high yield strengths there may be a minor reduction in the length of Class 2 or better bond. Satisfactory welds have been produced with materials having yield strengths ranging from 36.0 to 141.0 ksi. However, when body yield strengths exceed 80.0 ksi a minor decrease in bond lengths begins. A significant inverse relationship between stem yield strength and bond length was shown to exist. 8 refs., 9 figs., 10 tabs.
Date:
September 24, 1991
Creator:
Miller, R. G. & Perkins, M. A.
Object Type:
Report
System:
The UNT Digital Library
[Agenda: March on Austin meeting 1991]
Meeting agenda for March on Austin 1991 in August.
Date:
August 24, 1991
Creator:
March on Austin
Object Type:
Text
System:
The UNT Digital Library
The Tulia Herald (Tulia, Tex.), Vol. 83, No. 43, Ed. 1 Thursday, October 24, 1991
Weekly newspaper from Tulia, Texas that includes local, state and national news along with extensive advertising.
Date:
October 24, 1991
Creator:
Reynolds, Jim
Object Type:
Newspaper
System:
The Portal to Texas History
The Tulia Herald (Tulia, Tex.), Vol. 83, No. 4, Ed. 1 Thursday, January 24, 1991
Weekly newspaper from Tulia, Texas that includes local, state and national news along with extensive advertising.
Date:
January 24, 1991
Creator:
Reynolds, Jim
Object Type:
Newspaper
System:
The Portal to Texas History
[Letter from Pat Godbold to Abelardo Sanchez - May 24, 1991]
Letter from Pat Goldbold to Abelardo Sanchez in response to a postcard sent by Abelardo Sanchez requesting information about the timeline of Dr. J. C. Darracott's practice in Marfa, Texas, while researching the death of Ambrose Bierce. Mrs. Goldbold includes a short biography of Dr. Darracott in reference to Marfa, according to the Marfa Museum records.
Date:
May 24, 1991
Creator:
Goldbold, Pat
Object Type:
Text
System:
The Portal to Texas History
[News Clip: Christmas tree]
B-roll video footage from the WBAP-TV television station in Fort Worth, Texas, covering a news story.
Date:
December 24, 1991, 5:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Drive-by shooting]
B-roll video footage from the WBAP-TV television station in Fort Worth, Texas, covering a news story.
Date:
April 24, 1991
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Arsenic death]
Video footage from the KXAS-TV television station in Fort Worth, Texas, covering a news story.
Date:
April 24, 1991, 10:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Carswell]
B-roll video footage from the WBAP-TV television station in Fort Worth, Texas, covering a news story.
Date:
March 24, 1991, 10:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: War]
B-roll video footage from the WBAP-TV television station in Fort Worth, Texas, covering a news story.
Date:
February 24, 1991, 5:30 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Cop suspect]
Video footage from the KXAS-TV television station in Fort Worth, Texas, covering a news story.
Date:
April 24, 1991, 5:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
[News Clip: Police react]
Video footage from the KXAS-TV television station in Fort Worth, Texas, covering a news story.
Date:
April 24, 1991, 10:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
Theoretical studies on the electronic structure and properties of complex ceramic crystals and glasses
This progress report summarizes the accomplishment of the DOE-support research program at the University of Missouri-Kansas City for the period July 1, 1991--June 30, 1992. This is the second year of a three-year renewal. The major accomplishments for the year are: (a) Initiation of fundamental studies on the electronic properties of C{sub 60} and related crystals; (b) study of electronic structures and optical properties of several important ceramic crystals, especially on AlN, SiO{sub 2} and Al{sub 2}O{sub 3}; (c) first-principles calculation of total energies and structural phase transitions in oxides, nitrides, and borides; (d) theory of magnetism in Nd{sub 2}Fe{sub 14}B permanent magnetic alloy. The major focus for the next year's effort will be on the following areas: (1) Continuation of the fundamental studies on the buckminsterfullerene system with particular emphasis on the alkali-doped superconducting fullerides. (2) Fundamental studies on the structure and properties of Boron and B-related compounds. (3) Basic studies on the structural and electronic properties of metallic glasses with particular emphasis on the magnetic glasses. (4) Further development of the first-principles OLCAO method for applications to super-complex systems.
Date:
January 24, 1991
Creator:
Ching, Wai-Yim.
Object Type:
Report
System:
The UNT Digital Library
SPH (smoothed particle hydrodynamics) simulations of hypervelocity impacts
The smoothed particle hydrodynamics (SPH) method has been used to simulate several cases of hypervelocity impact in an exploratory study to determine the suitability of the method for such problems. The calculations compare favorably with experimental results and with other numerical simulations. We discuss the requirements that must be satisfied for SPH to produce accurate simulations of such problems. 18 refs., 9 figs.
Date:
January 24, 1991
Creator:
Cloutman, L.D.
Object Type:
Report
System:
The UNT Digital Library
Optical and environmentally protective coatings for potassium dihydrogen phosphate (KDP) harmonic converter crystals
Potassium dihydrogen phosphate (KDP) crystals have been used as harmonic converters on the Nova laser at LLNL for over six years. All crystals were coated with a single layer, quarterwave AR coating of porous silica with a refractive index of 1.22. This was prepared by a sol-gel process and was applied from a colloidal suspension by spin coating at room temperature. A few crystals were also coated with a methyl silicone coating prior to the application of the AR coating for environmental protection. The initial optical performance of all crystals was very good but there has been some deterioration over the years because of environmental and laser damage degradation. The deterioration in the silicone samples was, however, much less than the others. We are now in the process of replacing all ten KDP arrays with new crystals and will apply the silicone undercoat to all samples. Recently we have been evaluating a new perfluorinated organic polymer coating which has a refractive index of 1.29. This material is soluble in fluorinated solvents and can be applied by dip coating from solution at room temperature. We hope that this can provide environmental protection when applied to KDP and also act as an …
Date:
June 24, 1991
Creator:
Thomas, I. M.
Object Type:
Article
System:
The UNT Digital Library
[Clipping: Secret role of women fliers recalled]
Newspaper clipping of an article about WASP being hidden from public knowledge, including the U.S. Department of Defense withholding veteran status from the women who served in WWII. The article includes a photograph of a group of young women in jumpsuits walking away from a small propeller plane. On the back of the clipping is a large advertisement for a sale, and part of an article about Fort Concho.
Date:
November 24, 1991
Creator:
unknown
Object Type:
Clipping
System:
The Portal to Texas History
Oxidation of Coal and Coal Pyrite Mechanisms and Influence on Surface Characteristics
The objective of this research is to develop a mechanistic understanding of the oxidation of coal and coal pyrite, and to correlate the intrinsic physical and chemical properties of these minerals, along with changes resulting from oxidation, with those surface properties that influence the behavior in physical coal cleaning processes. The results will provide fundamental insight into oxidation, in terms of the bulk and surface chemistry, the microstructure, and the semiconductor properties of the pyrite. During the fourth quarter, characterization and oxidation tests were done on Upper Freeport coal from the Troutville {number sign}2 Mine, Clearfield County, Pennsylvania. In addition, standard test methods for characterizing pyrite-bearing materials were studied. 3 figs., 2 tabs.
Date:
September 24, 1991
Creator:
Doyle, F. M.
Object Type:
Report
System:
The UNT Digital Library
Cherokeean/Herald (Rusk, Tex.), Vol. 142, No. 51, Ed. 1 Thursday, January 24, 1991
Weekly newspaper from Rusk, Texas that includes local, state and national news along with extensive advertising.
Date:
January 24, 1991
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Cherokeean/Herald (Rusk, Tex.), Vol. 143, No. 38, Ed. 1 Thursday, October 24, 1991
Weekly newspaper from Rusk, Texas that includes local, state and national news along with extensive advertising.
Date:
October 24, 1991
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Texas Register, Volume 16, Number 71, Pages 5241-5288, September 24, 1991
A weekly publication, the Texas Register serves as the journal of state agency rulemaking for Texas. Information published in the Texas Register includes proposed, adopted, withdrawn and emergency rule actions, notices of state agency review of agency rules, governor's appointments, attorney general opinions, and miscellaneous documents such as requests for proposals. After adoption, these rulemaking actions are codified into the Texas Administrative Code.
Date:
September 24, 1991
Creator:
Texas. Secretary of State.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Texas Register, Volume 16, Number 39, Pages 2843-2925, May 24, 1991
A weekly publication, the Texas Register serves as the journal of state agency rulemaking for Texas. Information published in the Texas Register includes proposed, adopted, withdrawn and emergency rule actions, notices of state agency review of agency rules, governor's appointments, attorney general opinions, and miscellaneous documents such as requests for proposals. After adoption, these rulemaking actions are codified into the Texas Administrative Code.
Date:
May 24, 1991
Creator:
Texas. Secretary of State.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History