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[The Dallas Morning News, December 25, 1994] (open access)

[The Dallas Morning News, December 25, 1994]

An article in The Dallas Morning News that was written by Shermakaye Bass that discusses different university programs and art groups. The UNT NTIEVA and Dallas Museum of Art pairing is one of the featured groups.
Date: December 25, 1994
Creator: Bass, Shermakaye
System: The UNT Digital Library
An analysis of the Cured-in-Place Pipe (CIPP) subproject of the sanitary sewer rehabilitation project (open access)

An analysis of the Cured-in-Place Pipe (CIPP) subproject of the sanitary sewer rehabilitation project

The comprehensive rehabilitation of the Lawrence Livermore National Laboratory Sanitary Sewer System centers around a Cured-in-Place Pipe project. Driven by regulatory requirements to eliminate the potential for exfiltration, a careful condition assessment of the existing infrastructure was conducted. Under programmatic constraints to maintain continuous operations, the INLINER USA cured-in-place pipe system was selected as the appropriate technology, and the project is currently under contract.
Date: January 25, 1994
Creator: Morrow, W. & Siemiatkoski, S.
System: The UNT Digital Library
Fabrication and testing of a silicon immersion grating for infrared spectroscopy (open access)

Fabrication and testing of a silicon immersion grating for infrared spectroscopy

Recent advances in silicon micromachining techniques (e.g. anisotropic etching) allow the fabrication of very coarse infrared echelle gratings. When used in immersion mode, the dispersion is increased proportionally to the refractive index. This permits a very significant reduction in the overall size of a spectrometer while maintaining the same resolution. We have fabricated a right triangular prism (30{times}60{times}67 mm with a rectangular entrance face 30{times}38 mm) from silicon with a grating etched into the face of the hypotenuse. The grating covers an area of 32 mm by 64 mm and has a 97.5 PM periodicity with a blaze angle of 63.4{sup o}. The groove surfaces are very smooth with a roughness of a few manometers. Random defects in the silicon are the dominant source of grating scatter ({approx} 12% at 3.39 {mu}m). We measure a grating ghost intensity of 1.2%. The diffraction peak is quite narrow, slightly larger than the Airy disc diameter at F/12. However due to wavefront aberrations, perhaps 15--20% of the diffracted power is in the peak with the rest distributed in a diameter roughly five times the Airy disc.
Date: July 25, 1994
Creator: Kuzmenko, P. J.; Ciarlo, D. R. & Stevens, C. G.
System: The UNT Digital Library
Managing electronic records: A guideline (open access)

Managing electronic records: A guideline

A committee at Martin Marietta Energy Systems (MMES) has drafted a guideline to assist offices in the management of electronic records. This paper will address the activities surrounding its creating. The guideline is for use by creators, users, and custodians of any type of electronic information. The guideline supports and supplements requirements from DOE and the National Archives and Records Administration (NARA), other internal processes such as system reviews, and the comprehensive records management program. While an in-house publication, it could prove useful to other organizations implementing an electronic records management program.
Date: October 25, 1994
Creator: Stewart, J. G.
System: The UNT Digital Library
Scintillating-fiber imaging detector for 14-MeV neutrons (open access)

Scintillating-fiber imaging detector for 14-MeV neutrons

The authors have created a detector to image the neutrons emitted by imploded inertial-confinement fusion targets. The 14-MeV neutrons, which are produced by deuterium-tritium fusion events in the target, pass through an aperture to create an image on the detector. The neutron radiation is converted to blue light (430 nm) with a 20-cm-square array of plastic scintillating fibers. Each fiber is 10-cm long with a 1-mm-square cross section; approximately 35-thousand fibers make up the array. The resulting blue-light image is reduced and amplified by a sequence of fiber-optic tapers and image intensifiers, then acquired by a CCD camera. The fiber-optic readout system was tested optically for overall throughput the resolution. The authors plan to characterize the scintillator array reusing an ion-beam neutron source as well as DT-fusion neutrons emitted by inertial confinement targets. Characterization experiments will measure the light-production efficiency, spatial resolution, and neutron scattering within the detector. Several neutron images of laser-fusion targets have been obtained with the detector. Several neutron images of laser-fusion targets have been obtained with the detector. They describe the detector and their characterization methods, present characterization results, and give examples of the neutron images.
Date: July 25, 1994
Creator: Ress, D.; Lerche, R. A.; Ellis, R. J.; Heaton, G. W.; Nelson, M. B.; Mant, G. et al.
System: The UNT Digital Library
On the period of VY Ursae Majoris (open access)

On the period of VY Ursae Majoris

This article contains visual observation data of the carbon star VY Ursae Majoris.
Date: May 25, 1994
Creator: Ofek, Efran; Shemmer, Ohad & Gabzo, Ofer
System: The UNT Digital Library
Optical detection system for multispectral UV fluorescence laser remote sensing measurements (open access)

Optical detection system for multispectral UV fluorescence laser remote sensing measurements

A mobile laser remote sensing system is being developed for multispectral UV fluorescence detection of vapor, liquid, and solid effluents. TM system uses laser wavelengths between 250 and 400 nm to excite UV fluorescence spectra that can be used to detect and identify species in multicomponent chemical mixtures. With a scanning mirror assembly, the system is designed to map chemical concentrations with a range resolution of {approximately}5 m. In this paper we describe the optical detection system (scanning mirror assembly, 76 cm diameter collection telescope, relay optics, spectrometers, and detectors) associated data acquisition and control electronics. We also describe unique diagnostic software that is used for instrument setup and control.
Date: May 25, 1994
Creator: Tisone, G. C.; Clark, B.; Wakefield-Reyes, C.; Hargis, P. H., Jr.; Michie, B.; Downey, T. L. et al.
System: The UNT Digital Library