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Spall Strength Measurements of Concrete for Varying Aggregate Sizes
Controlled impact experiments have been performed to determine the spall strength of four different concrete compositions. The four concrete compositions are identified as, `SAC-5, CSPC', ("3/4") large, and ("3/8") small, Aggregate. They differ primarily in aggregate size but with average densities varying by less than five percent. Wave profiles from sixteen experiments, with shock amplitudes of 0.07 to 0.55 GPa, concentrate primarily within the elastic regime. Free-surface particle velocity measurements indicate consistent pullback signals in the release profiles, denoting average span strength of approximately 40 MPa. It is the purpose of this paper to present spall measurements under uniaxial strain loading. Notwithstanding considerable wave structure that is a unique characteristic to the heterogeneous nature of the scaled concrete, the spall amplitudes appear reproducible and consistent over the pressure range reported in this study.
Date:
May 5, 1999
Creator:
Chhabildas, Lalit C.; Kipp, Marlin E.; Reinhart, William D. & Wilson, Leonard T.
Object Type:
Article
System:
The UNT Digital Library
The Boerne Star (Boerne, Tex.), Vol. 94, No. 2, Ed. 1 Tuesday, January 5, 1999
Semiweekly newspaper from Boerne, Texas that includes local, state, and national news along with advertising.
Date:
January 5, 1999
Creator:
Chionsini, Brandi
Object Type:
Newspaper
System:
The Portal to Texas History
The Boerne Star (Boerne, Tex.), Vol. 94, No. 11, Ed. 1 Friday, February 5, 1999
Semiweekly newspaper from Boerne, Texas that includes local, state, and national news along with advertising.
Date:
February 5, 1999
Creator:
Chionsini, Brandi
Object Type:
Newspaper
System:
The Portal to Texas History
The Boerne Star (Boerne, Tex.), Vol. 94, No. 19, Ed. 1 Friday, March 5, 1999
Semiweekly newspaper from Boerne, Texas that includes local, state, and national news along with advertising.
Date:
March 5, 1999
Creator:
Chionsini, Brandi
Object Type:
Newspaper
System:
The Portal to Texas History
The Sealy News (Sealy, Tex.), Vol. 112, No. 81, Ed. 1 Tuesday, October 5, 1999
Semiweekly newspaper from Sealy, Texas that includes local, state, and national news along with advertising.
Date:
October 5, 1999
Creator:
Chionsini, Brandi
Object Type:
Newspaper
System:
The Portal to Texas History
The Sealy News (Sealy, Tex.), Vol. 112, No. 90, Ed. 1 Friday, November 5, 1999
Semiweekly newspaper from Sealy, Texas that includes local, state, and national news along with advertising.
Date:
November 5, 1999
Creator:
Chionsini, Brandi
Object Type:
Newspaper
System:
The Portal to Texas History
High Peak Power Gain Switched Flared Waveguide Lasers
We gain-switch flared waveguide lasers to obtain 14.5 W peak powers and 0.5 nJ pulse energies with laser structures compatible with the generation of diffraction-limited beams. The results are in excellent agreement with a microscopic laser model.
Date:
August 5, 1999
Creator:
Chow, W.W.; Indik, R.; Koch, S.W.; Mar, Alan, Vawter, G. Allen & Moloney, J.
Object Type:
Article
System:
The UNT Digital Library
Increasing Waterflood Reserves in the Wilmington Oil Field through Improved Reservoir Characterization and Reservoir Management
This project used advanced reservoir characterization tools, including the pulsed acoustic cased-hole logging tool, geologic three-dimensional (3-D) modeling software, and commercially available reservoir management software to identify sands with remaining high oil saturation following waterflood. Production from the identified high oil saturated sands was stimulated by recompleting existing production and injection wells in these sands using conventional means as well as a short radius redrill candidate.
Date:
April 5, 1999
Creator:
Clarke, D.; Koerner, R.; D., Moos; Nguyen, J.; Phillips, C.; Tagbor, K. et al.
Object Type:
Report
System:
The UNT Digital Library
Altus Times (Altus, Okla.), Vol. 99, No. 253, Ed. 1 Tuesday, January 5, 1999
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
January 5, 1999
Creator:
Cole, Carol
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 99, No. 280, Ed. 1 Friday, February 5, 1999
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
February 5, 1999
Creator:
Cole, Carol
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 99, No. 304, Ed. 1 Friday, March 5, 1999
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
March 5, 1999
Creator:
Cole, Carol
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 100, No. 17, Ed. 1 Monday, April 5, 1999
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
April 5, 1999
Creator:
Cole, Carol
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 100, No. 42, Ed. 1 Wednesday, May 5, 1999
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
May 5, 1999
Creator:
Cole, Carol
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Altus Times (Altus, Okla.), Vol. 100, No. 91, Ed. 1 Monday, July 5, 1999
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
July 5, 1999
Creator:
Cole, Carol
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Test Plan for Radioactive Testing of a Vertical Direct Denitration Calciner
A vertical calciner will be used to demonstrate the direct denitration process for converting plutonium-bearing liquors to stable plutonium rich solids. The calciner and some of its associated equipment were previously tested with non-radioactive chemicals to demonstrate operability.
Date:
October 5, 1999
Creator:
Compton, J. A.
Object Type:
Report
System:
The UNT Digital Library
The Message, Volume 35, February 5, 1999
Newsletter of Congregation Beth Yeshurun in Houston, including news and events, upcoming services, member announcements, editorials, and other information of interest to congregants.
Date:
February 5, 1999
Creator:
Congregation Beth Yeshurun (Houston, Tex.)
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
The Message, Volume 35, March 5, 1999
Newsletter of Congregation Beth Yeshurun in Houston, including news and events, upcoming services, member announcements, editorials, and other information of interest to congregants. This issue includes a Passover Guide that discusses how to prepare the home for the holiday.
Date:
March 5, 1999
Creator:
Congregation Beth Yeshurun (Houston, Tex.)
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Hypersonic ground test capabilities for T and E testing above mach 8 ''a case where S and T meets T and E''
Simulation of hypersonic flight in ground test and evaluation (T and E) facilities is a challenging and formidable task, especially to fully duplicate the flight environment above approximately Mach 8 for most all hypersonic flight systems that have been developed, conceived, or envisioned. Basically, and for many years, the enabling technology to build such a ground test wind tunnel facility has been severely limited in the area of high-temperature, high-strength materials and thermal protection approaches. To circumvent the problems, various approaches have been used, including partial simulation and use of similarity laws and reduced test time. These approaches often are not satisfactory, i.e. operability and durability testing for air-breathing propulsion development and thermal protection development of many flight systems. Thus, there is a strong need for science and technology (S and T) community involvement in technology development to address these problems. This paper discusses a specific case where this need exists and where significant S and T involvement has made and continues to make significant contributions. The case discussed will be an Air Force research program currently underway to develop enabling technologies for a Mach 8-15 hypersonic true temperature wind tunnel with relatively long run time. The research is based …
Date:
October 5, 1999
Creator:
Constantino, M.; Miles, R.; Brown, G.; Laster, M. & Nelson, G.
Object Type:
Article
System:
The UNT Digital Library
Laser Field Imaging Through Fourier Transform Heterodyne
The authors present a detection process capable of directly imaging the transverse amplitude, phase, and Doppler shift of coherent electromagnetic fields. Based on coherent detection principles governing conventional heterodyned RADAR/LADAR systems, Fourier Transform Heterodyne incorporates transverse spatial encoding of the reference local oscillator for image capture. Appropriate selection of spatial encoding functions allows image retrieval by way of classic Fourier manipulations. Of practical interest: (1) imaging may be accomplished with a single element detector/sensor requiring no additional scanning or moving components, (2) as detection is governed by heterodyne principles, near quantum limited performance is achievable, (3) a wide variety of appropriate spatial encoding functions exist that may be adaptively configured in real-time for applications requiring optimal detection, and (4) the concept is general with the applicable electromagnetic spectrum encompassing the RF through optical.
Date:
April 5, 1999
Creator:
Cooke, Bradly J.; Laubscher, Bryan E.; Olivas, Nicholas L.; Galbraith, Amy E.; Strauss, Charlie E. & Grubler, Andrew C.
Object Type:
Article
System:
The UNT Digital Library
Analysis and System Design Framework for Infrared Spatial Heterodyne Spectrometers
The authors present a preliminary analysis and design framework developed for the evaluation and optimization of infrared, Imaging Spatial Heterodyne Spectrometer (SHS) electro-optic systems. Commensurate with conventional interferometric spectrometers, SHS modeling requires an integrated analysis environment for rigorous evaluation of system error propagation due to detection process, detection noise, system motion, retrieval algorithm and calibration algorithm. The analysis tools provide for optimization of critical system parameters and components including : (1) optical aperture, f-number, and spectral transmission, (2) SHS interferometer grating and Littrow parameters, and (3) image plane requirements as well as cold shield, optical filtering, and focal-plane dimensions, pixel dimensions and quantum efficiency, (4) SHS spatial and temporal sampling parameters, and (5) retrieval and calibration algorithm issues.
Date:
April 5, 1999
Creator:
Cooke, Bradly J.; Smith, Barham W.; Laubscher, Bryan E.; Villeneuve, Pierre V. & Briles, Scott D.
Object Type:
Article
System:
The UNT Digital Library
An Investigation of Tendon Corrosion-Inhibitor Leakage into Concrete
During inspections performed at US nuclear power plants several years ago, some of the prestressed concrete containment had experienced leakage of the tendon sheathing filler. A study was conducted to indicate the extent of the leakage into the concrete and its potential effects on concrete properties. Concrete core samples were obtained from the Trojan Nuclear Plant. Examination and testing of the core samples indicated that the appearance of tendon sheathing filler on the surface was due to leakage of the filler from the conduits and its subsequent migration to the concrete surface through cracks that were present. Migration of the tendon sheathing filler was confined to the cracks with no perceptible movement into the concrete. Results of compressive strength tests indicated that the concrete quality was consistent in the containment and that the strength had increased relative to the strength at 28 days age.
Date:
July 5, 1999
Creator:
Costello, J. F.; Naus, D. J. & Oland, C. B.
Object Type:
Article
System:
The UNT Digital Library
[Annotated letter to potential beneficiaries of the 1999 Black Tie Dinner]
Letter to potential beneficiaries of the 1999 Black Tie Dinner, with handwritten notes, about applying.
Date:
February 5, 1999
Creator:
Cox, Garry; Cox, Steven
Object Type:
Letter
System:
The UNT Digital Library
[Letter to local beneficiaries regarding the 1999 Black Tie Dinner]
Letter from Garry and Steven Cox about applying to be a beneficiary for the 1999 Black Tie Dinner.
Date:
February 5, 1999
Creator:
Cox, Garry; Cox, Steven
Object Type:
Letter
System:
The UNT Digital Library
[Letter to potential beneficiary for the 1999 Black Tie Dinner]
Letter to potential beneficiaries of the 1999 Black Tie Dinner about applying as a beneficiary.
Date:
February 5, 1999
Creator:
Cox, Steven; Cox, Garry
Object Type:
Letter
System:
The UNT Digital Library