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[Letter from Jack Davis to Janice Wiggins, April 7, 1995]
Photocopy of a letter from Jack Davis, co-director of North Texas Institute for Educators on the Visual Arts, to Janice Wiggins, Dallas ISD. Discussing the use of grant money. Wiggins requested that the grant money, intended to be used for support of Dallas I.S.D's participation in the Secondary Institute be used to stipends for participants of the Elementary Institute instead. Davis writes back that this is not possible for several reason which he encloses in the letter, the first being that he does not want to jeopardize the relationship with his funders by using the grants for something that was not made clear in the condition when the money was given. Davis explains that if the money is not used for its original intended purpose for which they were in agreement, then they are obligated to return the money back. Copied on the letter is Bill Cormack.
Date:
April 7, 1995
Creator:
Davis, Donald Jack
Object Type:
Letter
System:
The UNT Digital Library
Geotomography applied at the Stripa Mine in Sweden
LLNL made ultrahigh-frequency (450-MHz) electromagnetic borehole-to-borehole transmissions in the Stripa Mine near Guldsmedshyttan, Sweden, in April 1979. Transmission loss measurements were made between four sets of 76-mm boreholes 30 m long, located at the end of a drift. Distances between the boreholes varied from 2 to 22 m. More than 25,000 data points were taken. A geotomograph was constructed to show the variation of attenuation between boreholes. The observed spatial variation of electromagnetic attenuation may be related to the expected stress relief created by the mine. Transmission loss measurements were also made between two converging boreholes drilled from the surface to points near the mine. Data taken at 21 MHz show a nearly uniform attenuation within this sampled region. These experiments demonstrate that geotomographic data collection/interpretation provides high-resolution images of the underground environment and can provide useful input to those charged with providing the detailed site characterizations needed for both short- and long-term monitoring of underground nuclear waste repositories.
Date:
April 7, 1980
Creator:
Okada, J.T.; Laine, E.F.; Lytle, R.J. & Daily,W.D.
Object Type:
Report
System:
The UNT Digital Library
Spatial averaging algorithms for ultrasonic inspection of austenitic stainless steel welds
Interpretation of ultrasonic inspection data from stainless steel welds is difficult because the signal-to-noise ratio is very low. The three main reasons for this are the granular structure of the weld, the high attenuation of stainless steel, and electronic noise. Averaging in time at the same position in space reduces electronic noise, but does not reduce ultrasonic noise from grain boundary scattering. Averaging wave-forms from different spatial positions helps reduce grain noise, but desired signals can destructively interfere if they shift in time. If the defect geometry is known, the ultrasonic waveforms can be shifted before averaging, ensuring signal reinforcement. The simplest geometry results in a linear time shift. An averaging algorithm has been developed which finds the optimum shift. This algorithm computes the averaged, or composite waveform as a function of the time shift. The optimum occurs when signals from a reflector become aligned in time, producing a large amplitude composite waveform. This algorithm works very well, but requires significant computer time and storage. This paper discusses this linear shift averaging algorithm, and considers an implementation using frequency domain techniques. Also, data from several weld defects are presented and analyzed.
Date:
April 7, 1980
Creator:
Horn, J. E.; Cooper, C.S. & Michaels, T.E.
Object Type:
Article
System:
The UNT Digital Library
[News Clip: Weed - Woman]
Video footage from the KXAS-TV/NBC station in Fort Worth, Texas, to accompany a news story.
Date:
April 7, 1994, 10:00 p.m.
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
Application of the Argonne Advanced Acceleration Test Facility to development for conventional accelerators
The Argonne Advanced Acceleration Test Facility is designed as a powerful tool to test ideas for very high gradient acceleration schemes based on direct beam excitation of plasmas, metal structures, dielectrics, etc. The characteristic size in these systems is )approximately) 1 cm, corresponding to frequencies )approximately) 10 GHz. The question addressed here is whether the special features of this facility have application as well to the development of components for the more conventional, lower frequency, accelerators now operating or under development. It is suggested that the usefulness of the facility for the development of conventional systems could be enhanced by a provision for longer time delay between driver and witness beam pulses. 9 refs., 2 figs.
Date:
April 7, 1988
Creator:
MacLachlan, J.A.
Object Type:
Report
System:
The UNT Digital Library
Suppression of transverse beam breakup modes in an induction accelerator by gas focusing
The effect of beam-generated positive ions on the beam-breakup instability in linear electron accelerators is calculated using simple models. The strongly nonlinear dependence of the ion focusing force on radius makes a complete suppression of the mode growth possible, in contrast to solenoidal focusing. The predicted gas pressures for significant stabilization of the mode growth in a machine configuration like ATA is relatively low (10/sup -5/ to 10/sup -4/ torr), even for high-Q modes.
Date:
April 7, 1980
Creator:
Briggs, R. J.
Object Type:
Report
System:
The UNT Digital Library
Role of human- and animal-sperm studies in the evaluation of male reproductive hazards
Human sperm tests provide a direct means of assessing chemically induced spermatogenic dysfunction in man. Available tests include sperm count, motility, morphology (seminal cytology), and Y-body analyses. Over 70 different human exposures have been monitored in various groups of exposed men. The majority of exposures studied showed a significant change from control in one or more sperm tests. When carefully controlled, the sperm morphology test is statistically the most sensitive of these human sperm tests. Several sperm tests have been developed in nonhuman mammals for the study of chemical spermatotoxins. The sperm morphology test in mice has been the most widely used. Results with this test seem to be related to germ-cell mutagenicity. In general, animal sperm tests should play an important role in the identification and assessment of potential human reproductive hazards. Exposure to spermatotoxins may lead to infertility, and more importantly, to heritable genetic damage. While there are considerable animal and human data suggesting that sperm tests may be used to detect agents causing infertility, the extent to which these tests detect heritable genetic damage remains unclear. (ERB)
Date:
April 7, 1982
Creator:
Wyrobek, A.J.; Gordon, L. & Watchmaker, G.
Object Type:
Article
System:
The UNT Digital Library
Cost effectiveness of long life incandescent lamps and energy buttons
Long-life replacement lamps for the incandescent lamp have been evaluated with regard to their cost effectiveness. The replacements include the use of energy buttons that extend lamp life as well as an adaptive fluorescent circline lamp that will fit into existing incandescent lamp sockets. The initial, operating, and replacement costs for one million lumen hours are determined for each lamp system. It is found that the most important component lighting cost is the operating cost. Using lamps that are less efficient or devices that cause lamps to operate less efficiently are not cost-effective. The adaptive fluorescent circline lamp, even at an initial unit cost of $20.00, is the most cost-effective source of illumination compared to the incandescent lamp and lamp systems examined.
Date:
April 7, 1980
Creator:
Verderber, R. & Morse, O.
Object Type:
Report
System:
The UNT Digital Library
Liquid chromatographic analysis of coal surface properties
The main objectives of this proposed research work are to refine further the inverse liquid chromatography technique for the study of surface properties of raw coals, treated coals and coal minerals in water, to evaluate relatively surface properties of raw coals, treated coals and coal minerals by inverse liquid chromatography, and to evaluate flotability of various treated coals in conjunction with surface properties of coals. Coals such as Pittsburgh seam coal, Illinois No. 6 coal, Wyodak coal are chosen as representatives of high-rank bituminous coal, high volatile bituminous coal and subbituminous coal, respectively. Coal minerals such as pyrite and dolomite are chosen as representative coal minerals.
Date:
April 7, 1992
Creator:
Kwon, K.C.
Object Type:
Report
System:
The UNT Digital Library
Guthrie Daily News. (Guthrie, Okla. Terr.), Vol. 5, No. 1452, Ed. 1 Saturday, April 7, 1894
Daily newspaper from Guthrie, Oklahoma Territory that includes local, territorial, and national news along with advertising.
Date:
April 7, 1894
Creator:
unknown
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Oklahoma Democrat. (Altus, Okla.), Vol. 4, No. 1, Ed. 1 Thursday, April 7, 1910
Weekly newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
April 7, 1910
Creator:
Ruthruff, C. E.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Mangum Star. (Mangum, Okla. Terr.), Vol. 16, No. 40, Ed. 1 Thursday, April 7, 1904
Weekly newspaper from Mangum, Oklahoma that includes local, territorial, and national news along with advertising.
Date:
April 7, 1904
Creator:
Echols, R. C. & Townsend, G. B.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Oklahoma State Register. (Guthrie, Okla.), Vol. 13, No. 17, Ed. 1 Thursday, April 7, 1904
Weekly newspaper from Guthrie, Oklahoma Territory that includes local, territorial, and national news along with advertising.
Date:
April 7, 1904
Creator:
unknown
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Logan County News. (Crescent, Okla.), Vol. 13, No. 22, Ed. 1 Friday, April 7, 1916
Weekly newspaper from Crescent, Oklahoma that includes local, state, and national news along with advertising.
Date:
April 7, 1916
Creator:
Frishman, Joseph
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Mangum Star. (Mangum, Okla.), Vol. 22, No. 41, Ed. 1 Thursday, April 7, 1910
Weekly newspaper from Mangum, Oklahoma that includes local, state, and national news along with advertising.
Date:
April 7, 1910
Creator:
Farris, Giles W.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Southwest World (Guthrie, Okla.), Vol. 1, No. 6, Ed. 1 Saturday, April 7, 1900
Weekly newspaper from Guthrie, Oklahoma Territory that includes local, territorial, and national news along with advertising.
Date:
April 7, 1900
Creator:
Prouty, Frank G.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Guthrie Daily Star (Guthrie, Okla.), Vol. 9, No. 24, Ed. 1 Sunday, April 7, 1912
Daily newspaper from Guthrie, Oklahoma that includes local, state, and national news along with advertising.
Date:
April 7, 1912
Creator:
Hornaday, W. H.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Tyrone Observer. (Tyrone, Okla.), Vol. 6, No. 35, Ed. 1 Thursday, April 7, 1910
Weekly newspaper from Tyrone, Oklahoma that includes local, state, and national news along with advertising.
Date:
April 7, 1910
Creator:
unknown
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Sentinel Leader. (Sentinel, Okla.), Vol. 7, No. 36, Ed. 1 Friday, April 7, 1911
Weekly newspaper from Sentinel, Oklahoma that includes local, state, and national news along with advertising.
Date:
April 7, 1911
Creator:
Inglish, G. L.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Cushing Independent. (Cushing, Okla.), Vol. 9, No. 19, Ed. 1 Thursday, April 7, 1910
Weekly newspaper from Cushing, Oklahoma that includes local, state, and national news along with advertising.
Date:
April 7, 1910
Creator:
Holland, Al. H.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Canadian Valley News. (Canadian, Oklahoma), Vol. 1, No. 21, Ed. 1 Friday, April 7, 1911
Weekly newspaper from Canadian, Oklahoma that includes local, state, and national news along with advertising.
Date:
April 7, 1911
Creator:
Tignor, J. D.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Guymon Herald. (Guymon, Okla.), Vol. 31, No. 6, Ed. 1 Thursday, April 7, 1921
Weekly newspaper from Guymon, Oklahoma that includes local, state, and national news along with advertising.
Date:
April 7, 1921
Creator:
unknown
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Kiowa Sentinel. (Kiowa, Indian Terr.), Vol. 2, No. 15, Ed. 1 Friday, April 7, 1905
Weekly newspaper from Kiowa, Indian Territory that includes local, territorial, and national news along with advertising.
Date:
April 7, 1905
Creator:
Vernon, John C.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Guymon Herald. (Guymon, Okla.), Vol. 20, No. 4, Ed. 1 Thursday, April 7, 1910
Weekly newspaper from Guymon, Oklahoma that includes local, state, and national news along with advertising.
Date:
April 7, 1910
Creator:
Zimmerman, Warren
Object Type:
Newspaper
System:
The Gateway to Oklahoma History