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  • 1
    Electronic Resource
    Electronic Resource
    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
    Keywords: 31.30.Gs ; 32.30.Jc
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01436955
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    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
    Keywords: 32.30.Jc ; 35.10.Bg
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01426878
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    Paper (German National Licenses)
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  • 3
    facet.materialart.
    Unknown
    Process Yields Strong, Void-Free Laminates (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: 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.
    Keywords: FABRICATION TECHNOLOGY
    Type: LAR-12982 , NASA Tech Briefs (ISSN 0145-319X); 7; 2; P. 203
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Apparatus for Sizing and Rewinding Graphite Fibers (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: 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.
    Keywords: FABRICATION TECHNOLOGY
    Type: LAR-13323 , NASA Tech Briefs (ISSN 0145-319X); 9; 4; P. 164
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Pultrusion Fabrication of Long Boom Models (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: 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.
    Keywords: FABRICATION TECHNOLOGY
    Type: 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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