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  • FABRICATION TECHNOLOGY  (3)
  • MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT  (3)
  • 32.30.Jc
  • 1
    Digitale Medien
    Digitale Medien
    Reanalysis of the Am I level spectrum and the nuclear quadrupole moments of Am-isotopes (1989)
    Springer
    The European physical journal 13 (1989), S. 181-192 
    Details
    ISSN: 1434-6079
    Schlagwort(e): 31.30.Gs ; 32.30.Jc
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The fine structure (fs) and hyperfine structure (hfs) level scheme of Am I is reanalysed using a semi empirical fitting procedure which incorporates experimental data. Especially new laserspectroscopic measurements of the hfs of some electronic transitions in the Am atom enables us to make a more detailed analysis of 5f 7 7s 7p fine structure in Am I. In particular a relation is given between theB-factor values and the value of the nuclear electric quadrupole moment of241Am independent of a calibration by results of nuclear spectroscopy.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01436955
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
    Volltext
  • 2
    Digitale Medien
    Digitale Medien
    Isotope shifts for the 5d 56s7s and 5d 56s6d configurations of Re I (1993)
    Springer
    The European physical journal 25 (1993), S. 185-189 
    Details
    ISSN: 1434-6079
    Schlagwort(e): 32.30.Jc ; 35.10.Bg
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The isotope shift and hyperfine structure in a rhenium hollow cathode discharge was studied for transitions of the type 5d 56s7s → 5d 56s6p and 5d 56s6d → 5d 56s6p through Doppler-free saturation absorption laserspectroscopy and high resolution interferometry. Taking configuration mixing in the lower levels of 5d 56s6p under consideration, we obtain average configuration isotope shift values for 5d 56s7s of −1760(100) MHz and for 5d 56s6d of −1970(200) MHz. These experimental values compare extremely well with the theoretically predicted configuration isotope shifts in rhenium, based on pseudo-relativistic Hartree-Fock calculations, of −1710 MHz and −1940 MHz, resp. In addition hyperfine structure constants for rhenium levels of 5d 56s6d are reported here for the first time.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01426878
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
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  • 3
    facet.materialart.
    Unbekannt
    Chemical and microbiological experimentation for development of environmental control and life support systems (1992)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: Microbiological techniques are under study with a view to the identification of viable microorganisms in liquid cultures, improve the identification of stressed organisms, and determine the biocidal activity of iodine and other chemicals on isolates from recycled water. A quality-assurance program has been implemented to validate data employed in making decisions concerning engineering and human health and safety. Analytical laboratory refinements will strongly aid the development of environmental control and life-support systems.
    Schlagwort(e): MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Materialart: AIAA PAPER 92-1606
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Unbekannt
    Process Yields Strong, Void-Free Laminates (1983)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: Need for lightweight materials as structural components for future space transportation systems stimulated development of systematic method for manufacturing a polyimide/graphite composite. Laminates manufactured by process are void-free, exhibit excellent thermo-oxidative stability up to 315 degrees C (600 degrees F) and are 40 percent lighter than aluminum. Process is precise, repeatable, and ideally suited for researchers and small-lot producers of composite materials.
    Schlagwort(e): FABRICATION TECHNOLOGY
    Materialart: LAR-12982 , NASA Tech Briefs (ISSN 0145-319X); 7; 2; P. 203
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Unbekannt
    Apparatus for Sizing and Rewinding Graphite Fibers (1986)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: Equipment ideally suited for research and development of new sizing solutions. Designed expecially for applying thermoplastic sizing solutions to graphite tow consisting of 3,000 to 12,000 filaments per tow, but accommodates other solutions, filament counts, and materials other than graphite. Closed system containing highly volatile methylene chloride vapors. Also ventilation system directly over resin reservoir. Concept used to apply sizing compounds on fiber tows or yarn-type reinforcement materials used in composite technology. Sizing solutions consist of compounds compatible with thermosets as well as thermoplastics.
    Schlagwort(e): FABRICATION TECHNOLOGY
    Materialart: LAR-13323 , NASA Tech Briefs (ISSN 0145-319X); 9; 4; P. 164
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 6
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    Unbekannt
    Implantable electrode for recording nerve signals in awake animals (1976)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: An implantable electrode assembly consisting of collagen and metallic electrodes was constructed to measure simultaneously neural signals from the intact nerve and bioelectrical noises in awake animals. Mechanical artifacts, due to bodily movement, were negligibly small. The impedance of the collagen electrodes, measured in awake cats 6-7 days after implantation surgery, ranged from 39.8-11.5 k ohms at a frequency range of 20-5 kHz. Aortic nerve activity and renal nerve activity, measured in awake conditions using the collagen electrode, showed grouped activity synchronous with the cardiac cycle. Results indicate that most of the renal nerve activity was from postganglionic sympathetic fibers and was inhibited by the baroceptor reflex in the same cardiac cycle.
    Schlagwort(e): MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Materialart: Journal of Applied Physiology; 41; July 197
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 7
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    Microbial distribution in the Environmental Control and Life Support System water recovery test conducted at NASA, MSFC (1991)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: NASA/MSFC is developing a physical/chemical treatment system to reclaim wastewater for reuse on Space Station Freedom (SSF). Integrated testing of hygiene and potable water subsystems assessed the capability to reclaim water to SSF specifications. The test was conducted from May through July 1990 with a total of 47 days of system test operation. Water samples were analyzed using standard cultural methods employing membrane filtration and spread plate techniques and epifluorescence microscopy. Fatty acid methyl ester and biochemical profiles were used for microbial identification. Analysis of waste and product water produced by the subsystems demonstrated the effective reduction of viable microbial populations greater than 8.0E + 06 colony forming units (CFU) per 100 mL to an average of 5 CFU/100 mL prior to distribution into storage tanks.
    Schlagwort(e): MAN/SYSTEM TECHNOLOGY AND LIFE SUPPORT
    Materialart: SAE PAPER 911377 , International Conference on Environmental Systems; Jul 15, 1991 - Jul 18, 1991; San Francisco, CA; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Pultrusion Fabrication of Long Boom Models (1987)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-07-12
    Beschreibung: Composite materials of quasi-isotropic strength obtained. Fiberreinforced polymer matrix material produced by pulling fibers through polymer resin system and then through preforming dies and heated curing die. Experiments with pultrusion conducted in advancedcomposites technology with applications to aeronautical and space structures.
    Schlagwort(e): FABRICATION TECHNOLOGY
    Materialart: LAR-13441 , NASA Tech Briefs (ISSN 0145-319X); 11; 3; P. 70
    Format: text
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    NASA TECHNICAL REPORTS
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