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  • Weitere Quellen  (458)
  • INSTRUMENTATION AND PHOTOGRAPHY  (287)
  • NONMETALLIC MATERIALS  (171)
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  • 1985-1989  (458)
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  • 1
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    Selected spectroscopic and magnetic properties of lanthanide complexes in polyimide XU-218 (1987)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: Polyimide XU-218 films containing approximately 5 wt pct of Eu(III), Gd(III), Tb(III), and Er(III) were prepared, and the effects of complexing each of the metals with the following four ligands were investigated: N-phenylphthalamate (NPPA), 2,4-pentanedionate (AcAc), 1,3-diphenyl 1,3-propanedionate (DBM), and a new hexa-aza-macrocyclic (MAC) ligand. The tris-chelated complexes of the mononegative ligands NPPA, AcAc, and DBM produced transparent, flexible films, which had magnetic and spectral properties very similar to those of the parent lanthanide complexes, while complexes of MAC showed problems due to the presence of lattice water and yielded dark brittle films. AcAc caused little or no effect on the glass transition temperature (Tg), while NPPA and DBM complexes lowered Tg to 269-290 C, and MAC indicated moisture by inflexion at 95-100 C with a true Tg at 320 C. All lanthanide-containing films were paramagnetic.
    Schlagwort(e): NONMETALLIC MATERIALS
    Materialart: ; : AIAA Flight Simula
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  • 2
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    An intercomparison of nitric oxide measurement techniques (1985)
    In:  Other Sources
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    Publikationsdatum: 2011-08-19
    Beschreibung: Results from an intercomparison of techniques to measure tropospheric levels of nitric oxide (NO) are discussed. The intercomparison was part of the National Aeronautics and Space Administration's Global Tropospheric Experiment and was conducted at Wallops Island, VA, in July 1983. Instruments intercompared included a laser-induced fluorescence system and two chemiluminescence instruments. The intercomparisons were performed with ambient air at NO mixing ratios ranging from 10 to 60 pptv and NO-enriched ambient air at mixing ratios from 20 to 170 pptv. All instruments sampled from a common manifold. The techniques exhibited a high degree of correlation among themselves and with changes in the NO mixing ratio. Agreement among the three techniques was placed at approximately + or - 30 percent. Within this level of agreement, no artifacts or species interferences were identified.
    Schlagwort(e): INSTRUMENTATION AND PHOTOGRAPHY
    Materialart: Journal of Geophysical Research (ISSN 0148-0227); 90; 12
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  • 3
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    A ground-based experimental test program to duplicate and study the spacecraft glow phenomenon (1985)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: The use of a plasma device, the Advanced Concepts Torus-I, for producing atoms and molecules to study spacecraft glow mechanisms is discussed. A biased metal plate, located in the plasma edge, is used to accelerate and neutralize plasma ions, thus generating a neutral beam with a flux approx. 5 x 10 to the 14th power/sq cm/sec at the end of a drift tube. Our initial experiments are to produce a 10 eV molecular and atomic nitrogen beam directed onto material targets. Photon emission in the spectral range 2000 to 9000 A from excited species formed on the target surface will be investigated.
    Schlagwort(e): INSTRUMENTATION AND PHOTOGRAPHY
    Materialart: NASA. Marshall Space Flight Center 2d Workshop on Spacecraft Glow; p 202-211
    Format: application/pdf
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  • 4
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    Telemycology - A novel approach to monitoring environmental microbial load in Space Station Freedom (1989)
    In:  Other Sources
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    Publikationsdatum: 2019-06-28
    Beschreibung: The currently available methods for monitoring environmental microbial load call for the cultivation of microbes on laboratory media, a time- and material-consuming task that is potentially hazardous. Telemycology proposed in this communication is designed to eliminate the need for growing microbes, especially fungi, on board the spacecraft and to shift the bulk of the work-load to the ground-based Microbiology Laboratory. The system is based on the principle of trapping microbial propagules on a membrane filter, treating it with a microbe-enhancing reagent, and examining under a microscope down-linked to the central laboratory equipped with a synchronized televideo, telerobotics, and image banking system.
    Schlagwort(e): INSTRUMENTATION AND PHOTOGRAPHY
    Materialart: SAE PAPER 891542
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  • 5
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    'Diamondlike' carbon films - Optical absorption, dielectric properties, and hardness dependence on deposition parameters (1985)
    In:  Other Sources
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    Publikationsdatum: 2019-06-28
    Beschreibung: An RF plasma deposition system was used to prepare amorphous 'diamondlike' carbon films. The source gases for the RF system include methane, ethylene, propane, and propylene, and the parameters varied were power, dc substrate bias, and postdeposition anneal temperature. Films were deposited on various substrates. The main diagnostics were optical absorption in the visible and in the infrared, admittance as a function of frequency, hardness, and Auger and ESCA spectroscopy. Band gap is found to depend strongly on RF power level and band gaps up to 2.7 eV and hardness up to 7 Mohs were found. There appears to be an inverse relationship between hardness and optical band gap.
    Schlagwort(e): NONMETALLIC MATERIALS
    Materialart: Journal of Vacuum Science and Technology A (ISSN 0734-2101); 3; 681-685
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  • 6
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    Synthesis, curing and physical behavior of maleimide terminated poly(arylene ethers) (1988)
    In:  Other Sources
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    Publikationsdatum: 2019-07-13
    Beschreibung: This paper describes the synthesis of maleimide terminated poly(ether ketones) using the solution imidization process described by Summers et al. (1987). Amorphous poly(arylene ether ketones), as well as poly(arylene ether sulfones, of controlled end group functionalities and molecular weights were synthesized by nucleophilic step polymerization of bisphehol-A phenolates with activated halides, such as 4,4'-difluorobenzophenone, and 'monofunctional' end cappers such as m-aminophenol. The thermal properties of the system included glass transition temperature (Tg) values of 160-170 C, with modulus above Tg proportional to cross-link density, which in turn was reciprocally related to oligomer molecular weight. The measurements of the fracture toughness values showed the materials to be very ductile, with the toughness increasing with oligomer molecular weight.
    Schlagwort(e): NONMETALLIC MATERIALS
    Materialart: Materials - Pathway to the future; Mar 07, 1988 - Mar 10, 1988; Anaheim, CA; United States
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  • 7
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    A 2-lambda laser-induced flurorescence field instrument for ground-based and airborne measurements of atmospheric OH (1985)
    In:  Other Sources
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    Publikationsdatum: 2019-07-12
    Beschreibung: A number of techniques have been proposed for detecting atmospheric OH radicals. Of these, the laser-induced fluorescence (LIF) technique has been used by the largest number of investigators. One of the problems arising in connection with the implementation of this technique is related to the perturbing effect of the UV (lambda approximately 282 nm) laser beam used for OH monitoring, while another problem relates to signal extraction. Several new LIF approaches have been or are currently under development with the objective to bring both problems under control. The present paper deals with the experimental features of one of these new approaches. The considered approach is referred to as 2-lambda laser-induced fluorescence (2-lambda LIF). It is shown that the 2-lambda LIF system provides significant advantages over earlier 1-lambda LIF OH measurement instruments operating at ambient pressure.
    Schlagwort(e): INSTRUMENTATION AND PHOTOGRAPHY
    Materialart: Journal of Geophysical Research (ISSN 0148-0227); 90; 12
    Format: text
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  • 8
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    A two-photon laser-induced fluorescence field instrument for ground-based and airborne measurements of atmospheric NO (1985)
    In:  Other Sources
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    Publikationsdatum: 2019-07-12
    Beschreibung: This paper reports on a new two-photon laser-induced fluorescence (TP-LIF) sensor capable of making routine measurements at the few parts per trillion volume level. This direct spectroscopic detection method has been demonstrated to be a reliable instrument while performing both on the ground and in the air. As currently designed it is unique in being 'signal' rather than 'signal-to-noise' limited. The latter characteristic enables the TP-LIF sensor to make atmospheric measurements of NO under environmental conditions that might normally be considered unsuitable for a laser technique. These include clouds, rain, and, in general, high-atmospheric-aerosol loading conditions. Of special interest is the insensitivity of the TP-LIF NO instrument to changes in pressure while operating in the troposphere. This characteristic has enabled this sensor to be used to record real-time altitude profiles of NO. Future improvements should make possible two measurement opportunities: (1) NO flux measurements via the airborne eddy-correlation method and (2) nitrogen isotopic distribution measurements (e.g., (N-15)(0-16) versus (N-14)(0-16) as a means of identifying specific NO(x) sources.
    Schlagwort(e): INSTRUMENTATION AND PHOTOGRAPHY
    Materialart: Journal of Geophysical Research (ISSN 0148-0227); 90; 12
    Format: text
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  • 9
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    Evaluation of a Si:Ga direct readout array (1986)
    In:  CASI
    Details
    Publikationsdatum: 2006-02-14
    Beschreibung: Preliminary results from the Hughes 58 x 62 gallium-doped silicon infrared array are presented. The device functioned predictably and repeatedly at the low temperatures for the Space Infrared Telescope Facility (SIRTF). Power dissipation was reduced to acceptable levels while still maintaining the device speed. The infrared response was excellent and the degree of anomalous effects was compatible to conventional photoconductors.
    Schlagwort(e): INSTRUMENTATION AND PHOTOGRAPHY
    Materialart: NASA. Ames Research Center Proceedings of the Second Infrared Detector Technology Workshop; 16 p
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  • 10
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    Characterization of 2.5 microns HgCdTe detectors for low-background applications (1986)
    In:  CASI
    Details
    Publikationsdatum: 2006-02-14
    Beschreibung: A program of testing aimed at the evaluation of systems that have the potential to provide the level of performance required for use in space-based instruments was undertaken and their usefulness appraised for astronomy. The results of the first phase of the program to characterize selected pixels of a HgCdTe photovoltaic array detector were reported.
    Schlagwort(e): INSTRUMENTATION AND PHOTOGRAPHY
    Materialart: NASA. Ames Research Center Proceedings of the Second Infrared Detector Technology Workshop; 9 p
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