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High-pressure low-symmetry phases of cesium halides

Description: In this article, the relative stability of different high-pressure phases of various cesium halides is studied from first principles and analyzed using the Landau theory of phase transitions.
Date: April 1, 1995
Creator: Buongiorno Nardelli, Marco; Baroni, Stefano & Giannozzi, Paolo
Partner: UNT College of Arts and Sciences
open access

Field Errors in Hybrid Insertion Devices

Description: Hybrid magnet theory as applied to the error analyses usedin the design of Advanced Light Source (ALS) insertion devices isreviewed. Sources of field errors in hybrid insertion devices arediscussed.
Date: February 3, 1995
Creator: Schlueter, R.D.
Partner: UNT Libraries Government Documents Department
open access

Crystalline Beam Properties as Predicted for the Storage Ring ASTRID and TSR

Description: Employing a previously developed formalism 1, we have performed ground-state and melting calculations of the expected crystalline beams in ion storage rings ASTRID and TSR.
Date: March 1, 1995
Creator: Wei, J.; Li, X. P. & Sessler, Andrew M.
Partner: UNT Libraries Government Documents Department
open access

SEPARATION OF TRITIATED WATER FROM WATER USING COMPOSITE MEMBRANES

Description: The work in this task involves the use of composite membranes to remove tritium from contaminated water at DOE sites. Experience with membrane systems in industry indicates that they are inherently energy efficient. Furthermore, membrane technologies such as reverse-osmosis have been well developed for desalination and other industrial/municipal applications. Aromatic polyphosphazenes were chosen as the polymeric material for the membranes being investigated because they have excellent radiolog… more
Date: December 18, 1995
Creator: JB, DUNCAN & DA, NELSON
Partner: UNT Libraries Government Documents Department
open access

Feasibility of Measuring the Cosmological Constant [LAMBDA]and Mass Density [Omega]using Type Ia Supernovae

Description: We explore the feasibility of resurrecting the apparent magnitude-redshift relation for a 'standard candle' to measure the cosmological constant and mass density. We show that type Ia supernovae, if measured with 0.15 mag uncertainty out to a redshift of z = 1, may provide a good standard candle or calibrated candle for this purpose. The recent discovery of probable type Ia supernovae in the redshift range z = 0.3 to 0.5 (Perlmutter et al. 1994a, and 1994b) indicates that the flux of optical ph… more
Date: April 1, 1995
Creator: Goobar, A. & Perlmutter, S.
Partner: UNT Libraries Government Documents Department
open access

Use of Volatile Tracers to Determine the Contribution ofEnvironment Tobacco Smoke to Concentrations of Volatile Organic Compoundsin Smoking Environments

Description: Three volatile nitrogen-containing compounds, 3-ethenylpyridine (3-EP), pyridine and pyrrole, were investigated as potential tracers for determining the contribution of environmental tobacco smoke (ETS) to concentrations of volatile organic compounds (VOCs) in indoor environments with smoking. The source emission rates of the three tracers and ten selected VOCs in ETS were first measured in a room-size environmental chamber for a market-weighted selection of six commercial cigarettes. The ratio… more
Date: December 1, 1995
Creator: Hodgson, A. T.; Daisey, J. M.; Alevantis, L. E.; Mahanama, K. R. R. & Ten Brinke, J.
Partner: UNT Libraries Government Documents Department
open access

A Generalized {ital K} Correction for Type Ia Supernovae: Comparing {ital R}-band Photometry Beyond {ital z=9.2} with B,V, and {ital R}-band Nearby Photometry

Description: Photometric measurements show that, as a group, nearby Type Ia supernovae follow similar light curves and reach similar peak magnitudes (Branch & Tammann 1992). Thus, these supernovae may serve as standard candles or calibrated candles at cosmological distances. Magnitudes of local and distant supernovae, both in the same filter band, are compared using a K correction to account for the different spectral regions incident on that filter. A generalized approach compares magnitudes in different b… more
Date: November 1, 1995
Creator: Kim, Alex; Goodbar, Ariel & Perlmutter, Saul
Partner: UNT Libraries Government Documents Department
open access

Four Papers by the Supernova Cosmology Project

Description: Our search for high-redshift Type Ia supernovae discovered, in its first years, a sample of seven supernovae. Using a 'batch' search strategy, almost all were discovered before maximum light and were observed over the peak of their light curves. The spectra and light curves indicate that almost all were Type Ia supernovae at redshifts z = 0.35 - 0.5. These high-redshift supernovae can provide a distance indicator and 'standard clock' to study the cosmological parameters q{sub 0}, {Lambda}, {Ome… more
Date: June 1, 1995
Creator: Perlmutter, S. & al., et
Partner: UNT Libraries Government Documents Department
open access

Design of a relativistic Klystron Two-Beam Accelerator Prototype

Description: We are designing an experiment to study physics, engineering, and costing issues of an extended Relativistic Klystron Two-Beam Accelerator (RK-TBA). The experiment is a prototype for an RK-TBA based microwave power source suitable for driving a 1 TeV linear collider. Major components of the experiment include a 2.5-MV, 1.5-kA electron source, a 11.4-GHz modulator, a bunch compressor, and a 8-m extraction section. The extraction section will be comprised of 4 traveling-wave output structures, ea… more
Date: April 1, 1995
Creator: Westenskow, G.; Caporaso, G.; Chen, Y.; Houck, T.; Yu, S.; Chattopadhyay, S. et al.
Partner: UNT Libraries Government Documents Department
open access

Improving plasma shaping accuracy through consolidation of control model maintenance, diagnostic calibration, and hardware change control

Description: With the advent of more sophisticated techniques for control of tokamak plasmas comes the requirement for increasingly more accurate models of plasma processes and tokamak systems. Development of accurate models for DIII-D power systems, vessel, and poloidal coils is already complete, while work continues in development of general plasma response modeling techniques. Increased accuracy in estimates of parameters to be controlled is also required. It is important to ensure that errors in support… more
Date: December 1, 1995
Creator: Baggest, D. S.; Rothweil, D. A.; Pang, S.; Walker, M. L. & Nerem, A.
Partner: UNT Libraries Government Documents Department
open access

Multidimensional DDT modeling of energetic materials

Description: A nonequilibrium continuum mixture model has been incorporated into the CTH shock physics code to describe deflagration-to-detonation transition in granular energetic materials. This approach treats multiple thermodynamic and mechanics fields including the effects of relative material motion, rate-dependent compaction and interphase exchange of mass, momentum and energy. A finite volume description is formulated and internal state variables are solved using an operator-splitting method. Numeric… more
Date: August 1, 1995
Creator: Baer, M. R.; Hertel, E. S. & Bell, R. L.
Partner: UNT Libraries Government Documents Department
open access

Orientation selection and microstructural evolution of epitaxial platinum films on (001) magnesium oxide

Description: Thin platinum films were deposited at several different deposition rates and with varying thickness on (001)-cut MgO single crystal substrates by electron beam evaporation. A mixture of two epitaxial Pt orientations were detected in the films by X-ray diffraction and planar ion channeling experiments: (001)[100]Pt // (001)[100]MgO (the [open quotes]cube-on-cube[close quotes] orientation) and (111)[110]Pt // (001)[110]MgO. The effect of deposition rate on film orientation indicated the (111)Pt o… more
Date: January 1, 1995
Creator: McIntyre, P.C.; Maggiore, C.J. & Natasi, M.
Partner: UNT Libraries Government Documents Department
open access

[Support you local museum, June 11, 1995]

Description: An article written by Janet Tyson about the need to support local museums. The Amon Carter Museum is featured in the piece.
Date: June 11, 1995
Creator: Tyson, Janet
Partner: UNT Libraries Special Collections
open access

[Fort Worth Star-Telegram, July 7-13, 1995]

Description: An article in the Fort Worth Star-Telegram about the upcoming collections and events at the Amon Carter Museum in Fort Worth. It is titled Little Journeys and has information about tours and group visits.
Date: [1995-07-07..1995-07-13]
Creator: Fort Worth Star-Telegram
Partner: UNT Libraries Special Collections
open access

[Amon Carter director resigns after 15 years]

Description: An article written by Janet Kutner, the art critic for The Dallas Morning News, covering the resignation of Jan Muhlert from the Amon Carter Museum. It gives a short history of Muhlert's time at the museum and words from past co-workers.
Date: 1995
Creator: Kutner, Janet
Partner: UNT Libraries Special Collections
open access

[Fort Worth Star-Telegram Arts & Entertainment, January 30, 1995]

Description: An article written by Janet Tyson for the Arts & Entertainment section of the Fort Worth Star-Telegram titled 'Thumbnail Sketch'. The piece is a snapshot of who Dr. R. William McCarter is with direct quotes from him.
Date: January 30, 1995
Creator: Tyson, Janet
Partner: UNT Libraries Special Collections
open access

[Life and Arts, September 16, 1995]

Description: An article titled "School of Thought" written by Janet Tyson for the Life & Arts section of the Fort Worth Star Telegram. It covers a group of fifth-graders while they visit the at museums in the Fort Worth area.
Date: September 16, 1995
Creator: Tyson, Janet
Partner: UNT Libraries Special Collections
open access

[UNT InHouse, Vol. 4, No. 3, March 1995]

Description: An article written by Cass Brunner for UNT InHouse about a grant from the Edward and Betty Marcus Foundation that was awarded to the NTIEVA program in partnership with the Dallas Museum of Art. The grant totals $784,277 and aims to fund improvements and initiatives in the two groups.
Date: March 1995
Creator: Brunner, Cass
Partner: UNT Libraries Special Collections
open access

[UNT graduate students take center stage, April 9, 1995]

Description: An article written by April M. Washington for the Denton Record-Chronicle that covers two graduate students from UNT, Bader Alruwais and Matthew Mailman. Alruwais received the Prince Bandar ibn Sultan Annual Award for Cultural and Scientific Research and Mailman is conducting a recital performance.
Date: April 9, 1995
Creator: Washington, April M.
Partner: UNT Libraries Special Collections
open access

[Art Smart article, April 9, 1995]

Description: An article from the Fort Worth Star-Telegram written by Clara Herrera. The article covers Brandon Lewis and other students in art classes and the logistics behind what courses are available to them.
Date: April 9, 1995
Creator: Herrera, Clara G.
Partner: UNT Libraries Special Collections
open access

Technical and policy issues related to semantically and spatially incompatible geodata

Description: Both the Intelligent Transportation Systems (ITS) and National Information Infrastructure (NU) efforts have ambitious goals that are expected to improve the fundamental infrastructure, commerce, and society of the United States. Achieving these goals will require rapid development and deployment of information compatibility methods through technical and institutional standards. These standards will have to be scaleable and flexible to support new, and as-yet-undiscovered, data. Yet they will al… more
Date: July 1, 1995
Creator: Bespalko, Stephen J.; Ganter, John H. & Van Meter, Marsha D.
Partner: UNT Libraries Government Documents Department
open access

Advanced turbine cooling, heat transfer, and aerodynamic studies

Description: The contractual work is in three parts: Part I - Effect of rotation on enhanced cooling passage heat transfer, Part II - Effect of Thermal Barrier Coating (TBC) spallation on surface heat transfer, and Part III - Effect of surface roughness and trailing edge ejection on turbine efficiency under unsteady flow conditions. Each section of this paper has been divided into three parts to individually accommodate each part. Part III is further divided into Parts IIIa and IIIb.
Date: December 31, 1995
Creator: Han, Je-Chin & Schobeiri, Meinhard T.
Partner: UNT Libraries Government Documents Department
open access

Measurement of ultrashort pulses with a non-instantaneous nonlinearity

Description: We show how non-instantaneous nonlinearities can be used to characterize an ultrashort pulse in an extension of the Frequency-Resolved Optical Gating technique. We demonstrate this principle using the Raman effect in fused silica.
Date: February 1, 1995
Creator: DeLong, K. W.; Ladera, C. L.; Trebino, R.; Kohler, B. & Wilson, K. R.
Partner: UNT Libraries Government Documents Department
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