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28,369 Matching Results

Start Over Access Open Access Year 1990 Language English

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Results: 1 - 24 of 28,369 next

Dallas Museum of Art Installation: Pre-Columbian Art, 1990-1992 [Photographs]

Photographs of the installation of Pre-Columbian art at the Dallas Museum of Art in 1990 and 1992. Photographs documenting this installation include twenty-eight views of artworks installed in galleries on the museum’s third floor.

Date: {1990,1992}

Creator: Dallas Museum of Art

Object Type: Collection

System: The Portal to Texas History

captions transcript

[Sammonds Family Videos, No. 16 - Summer Vacation, 1990]

This home movie excerpt documents a portion of the Sammonds family summer vacation and includes visiting an unidentified location and zoo. Also included is the family socializing. The video ends with brief footage of the family at Glacier National Park.

Date: {1990-07-02,1990-07-05,1990-07-09}

Creator: Sammonds, Ron, Jr.

Object Type: Video

System: The Portal to Texas History

captions transcript

[Sammonds Family Videos, No. 17 - Summer Vacation, 1990]

This home movie excerpt documents the Sammonds family's 1990 summer vacation. Footage includes Glacier National Park, Monument Valley, Four Points Monument, and a trip to a lake. Much of the footage is narrated by Mr. Sammonds.

Date: {1990-07-11,1990-07-16,1990-07-17}

Creator: Sammonds, Ron, Jr.

Object Type: Video

System: The Portal to Texas History

(open access)

A 1. 5--4 Kelvin detachable cold-sample transfer system: Application to inertially confined fusion with spin-polarized hydrogens fuels

A compact cold-transfer apparatus for engaging and retrieving samples at liquid helium temperatures (1.5--4K), maintaining the samples at such temperatures for periods of hours, and subsequently inserting them in diverse apparatuses followed by disengagement, is described. The properties of several thermal radiation-insulating shrouds, necessary for very low sample temperatures, are presented. The immediate intended application is transportable target-shells containing highly spin-polarized deuterons in solid HD or D{sub 2} for inertially confined fusion (ICF) experiments. The system is also valuable for unpolarized high-density fusion fuels, as well as for other applications which are discussed. 9 refs., 6 figs.

Date: January 1, 1990

Creator: Alexander, N.; Barden, J.; Fan, Q. & Honig, A.

Object Type: Report

System: The UNT Digital Library

(open access)

3-D Depth Migration via McClellan Transformations

Three-dimensional seismic wavefields may be extrapolated in depth, one frequency at a time, by two-dimensional convolution with a circularly symmetric, frequency- and velocity-dependent filter. This depth extrapolation, performed for each frequency independently, lies at the heart of 3-D finite-difference depth migration. The computational efficiency of 3-D depth migration depends directly on the efficiency of this depth extrapolation. McClellan transformations provide an efficient method for both designing and implementing two-dimensional digital filters that have a particular form of symmetry, such as the circularly symmetric depth extrapolation filters used in 3-D depth migration. Given the coefficients of one-dimensional, frequency- and velocity-dependent filters used to accomplish 2-D depth migration, McClellan transformations lead to a simple and efficient algorithm for 3-D depth migration. 21 refs., 12 figs.

Date: 1990~

Creator: Hale, D.

Object Type: Report

System: The UNT Digital Library

[3 Women and a Man Talking]

Photograph of three women and a man talking. One of the women is wearing a Russian gold star and holding a pen.

Date: 1990~

Creator: unknown

Object Type: Photograph

System: The Portal to Texas History

(open access)

A 4. pi. tracking TPC magnetic spectrometer for RHIC

The primary physics objective of the 4{pi} TPC magnetic spectrometer proposal is to search for the Quark-Gluon Plasma. In previous workshops we have discussed what the possible hadronic signatures of such a state of matter would be. Succinctly, the QGP is a direct prediction of non-perturbative QCD. Therefore the question of the existence of this new state of matter bears directly on the validity of non-perturbative QCD. However, since non-perturbative QCD has never been established, it is apparent that what may await us is a host of new phenomena that will go beyond the standard model.

Date: January 1, 1990

Creator: Danby, G.; Eiseman, S. E.; Etkin, A.; Foley, K. J.; Hackenburg, R. W.; Longacre, R. S. et al.

Object Type: Article

System: The UNT Digital Library

[12 panel handmade paper and silk artwork]

The artwork consists of twelve panels in varying hues of pinks, blues, browns with some angular textured lines resembling furrows and some blue lines resembling water run through and across the panels.

Date: 1990~

Creator: Spear, Shigeko

Object Type: Artwork

System: The UNT Digital Library

(open access)

50 kA, 50 kV DC international and switching systems for the Los Alamos ZTH experiment

Los Alamos National Laboratory has completed the engineering design and development for the high power electrical switching networks for the ZTH experiment. ZTH is Reversed Field Pinch (RFP) plasma experiment with a 4 MA plasma current capability. Power to the ohmic heating (OH), equilibrium field (EF), and toroidal field (TF) coils will be provided from a 1.43 GVA turbo-alternator, which has over 600 MJ of extractable energy. The DC interrupting switch will handle 2.4 GVA, 150 MJ during initial machine operations. An additional 150 to 200 MJ are required for flat-topping the plasma current. A new ultra-high power switch, designed and tested at Los Alamos, will be used to reconfigure the power supply connections so that the supplies can be switched from parallel to series operation. In this manner, the same supplies can be used to charge and then flat-top the OH coils. The inexpensive cost of these switches results in significant economy of power supplies and systems. Detailed engineering information will be presented for the family of 25 kA and 50 kA, 50kV fast isolation and transfer switches, including testing of special water-cooled units capable of 50,000 amperes continuous duty. Similarly, detailed engineering data will be provided for the …

Date: January 1, 1990

Creator: Reass, W. A.; Cordova, R. J. & Garcia, J. G.

Object Type: Article

System: The UNT Digital Library

(open access)

65 Minutes, January-February 1990

Bimonthly newsletter of Denton Boy Scout Troop 65 containing a list of upcoming events, news and announcements, and other information for members.

Date: January 1990

Creator: Boy Scouts of America. Troop 65 (Denton, Tex.)

Object Type: Journal/Magazine/Newsletter

System: The Portal to Texas History

90-208, Voyager

Light shades of pinkish grays create the background juxtaposed with linear pattern and layered with small multi-hued geometric shapes and a linear drawing of a ship and silhouettes of two figures.

Date: 1990

Creator: Falsetta, Vincent

Object Type: Artwork

System: The UNT Digital Library

[100 W. Oak]

Photograph of the front and side of the Kolstad Jewelry store, located at 100 W. Oak in Palestine, Texas, taken from the corner of Oak and Sycamore streets. It is a two-story brick building with decorative architectural elements around the upper-story windows and roofline. On the first floor, the walls around the store are tiled and there is a striped awning over the sidewalk with the text "Texas' Oldest Store" above the entrance. Signs above the awning say "Thomas C. Smith, Proprietor," "Kolstad," and "George Handson: Jeweler, Calligrapher, Clock Repair" on the front of the store and "Kolstad [...] Texas' Oldest Store" on the side. A part of an adjacent building is visible on the far right.

Date: 1990~

Creator: McReynolds, Oliver

Object Type: Photograph

System: The Portal to Texas History