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  • 1980-1984  (2)
  • 1970-1974  (4)
  • 1965-1969  (2)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    The small-angle neutron scattering spectrometer at the University of Missouri research reactor (1981)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 14 (1981), S. 370-382 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: A small-angle neutron scattering (SANS) spectrometer has been constructed at the University of Missouri Research Reactor Facility (MURR). The design of the MURR–SANS is unusual in that the size of the reactor containment building constrains the flight path to be vertical. This is achieved by Bragg scattering upward through 90° from a set of slightly misaligned pyrolytic graphite crystals to provide a neutron beam at 4.75 Å with a wavelength spread of approximately 4.1%. The beam incident on the sample is defined by two matched variable apertures located either 3.0 or 4.5 m apart. The evacuated scattered flight path is designed with removable extensions to match the primary flight path in length. The instrument has an automatic sample handling capability provided by its own dedicated PDP 11/03 computer. The detector is a large assembly of commercially available linear 3He detectors as an economic alternative to a crossed-wire two-dimensional multi-detector. An array of 43 position-sensitive proportional counters, 24 in (609.6 mm) long and 0.5 in (12.7 mm) in diameter, using charge division gives a spatial resolution of 5 x 12.7 mm. The area-averaged detector efficiency is about 84% at a wavelength of 4.75 Å. The range of scattering vectors that can be measured is 0.005 〈 Q〈 0.15 Å−1. The instrument is well suited to a wide variety of experiments on specimens having characteristic dimensions between 20 and 500 Å. MURR–SANS is designed as a user-oriented facility which provides both reasonable resolution and intensity on sample at a modest cost, and forms part of a neutron scattering center.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889881009631
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Small-angle X-ray scattering from helical macromolecules (1971)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 4 (1971), S. 290-293 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: An earlier calculation of the intensity of small-angle X-ray scattering from helical filaments is extended to give an expression for the intensity from helical macromolecules with a finite cross section. The results are in quite good agreement with an experimental scattering curve for a solution of DNA molecules.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S002188987100699X
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Effects of molding temperatures on aqueous fatigue behavior of polycarbonate (1971)
    Springer
    Experimental mechanics 11 (1971), S. 507-513 
    Details
    ISSN: 1741-2765
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Fatigue behavior of polycarbonate was investigated to evaluate its potenitial as a material for prosthetic heart valves. Smooth and notched small cantilever specimens were injection molded using various combinations of cylinder and mold temperates. Fatigue testing was conducted in a machine specifically designed to accommodate multipe specimens inliquid environments. Results presented herein are for water immersion. The fatigue lives fell on Weibull distributions with nonzero minimum-life parameters. S-N equations were fitted at constant probabilities of failure; most of these had nonzero fatigue-limit parameters. Polycarbonate fatigue strengths, of notched spcimens particularly, were greatly influenced by cylinder and mold temperatures. Notch sensitivities varied from very low to quite high. These effects were attributed to molecular orientation and residual stresses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02327690
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  • 4
    Electronic Resource
    Electronic Resource
    Environmental fatigue testing of molded plastics for prosthetic heart valves (1969)
    Springer
    Experimental mechanics 9 (1969), S. 171-178 
    Details
    ISSN: 1741-2765
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A testing machine was designed specifically to study fatigue behavior of molded polymeric materials by subjecting multiple cantilever specimens to vibratory fluid loading. The fluid loading permits aqueous or other environments, facilitates temperature control, and makes possible high testing frequencies. Samples of fifteen to thirty specimens may be tested simultaneously to obtain statistical data. Example results are presented showing Weibull distributions fitted to polymethyl methacrylate fatigue-life data. A statistical criterion was used to verify that scatter, due to the machine and testing technique, was not excessive.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02326566
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  • 5
    facet.materialart.
    Unknown
    Effects of molding temperatures on aqueous fatigue behavior of polycarbonate (1971)
    Springer
    Details
    Publication Date: 1971-11-01
    Print ISSN: 0014-4851
    Electronic ISSN: 1741-2765
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Springer
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  • 6
    facet.materialart.
    Unknown
    Environmental fatigue testing of molded plastics for prosthetic heart valves (1969)
    Springer
    Details
    Publication Date: 1969-04-01
    Print ISSN: 0014-4851
    Electronic ISSN: 1741-2765
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Springer
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  • 7
    facet.materialart.
    Unknown
    The small-angle neutron scattering spectrometer at the University of Missouri research reactor (1981)
    International Union of Crystallography
    Details
    Publication Date: 1981-12-01
    Description: A small-angle neutron scattering (SANS) spectrometer has been constructed at the University of Missouri Research Reactor Facility (MURR). The design of the MURR–SANS is unusual in that the size of the reactor containment building constrains the flight path to be vertical. This is achieved by Bragg scattering upward through 90° from a set of slightly misaligned pyrolytic graphite crystals to provide a neutron beam at 4.75 Å with a wavelength spread of approximately 4.1%. The beam incident on the sample is defined by two matched variable apertures located either 3.0 or 4.5 m apart. The evacuated scattered flight path is designed with removable extensions to match the primary flight path in length. The instrument has an automatic sample handling capability provided by its own dedicated PDP 11/03 computer. The detector is a large assembly of commercially available linear 3He detectors as an economic alternative to a crossed-wire two-dimensional multi-detector. An array of 43 position-sensitive proportional counters, 24 in (609.6 mm) long and 0.5 in (12.7 mm) in diameter, using charge division gives a spatial resolution of 5 x 12.7 mm. The area-averaged detector efficiency is about 84% at a wavelength of 4.75 Å. The range of scattering vectors that can be measured is 0.005 〈 Q〈 0.15 Å−1. The instrument is well suited to a wide variety of experiments on specimens having characteristic dimensions between 20 and 500 Å. MURR–SANS is designed as a user-oriented facility which provides both reasonable resolution and intensity on sample at a modest cost, and forms part of a neutron scattering center.
    Print ISSN: 0021-8898
    Electronic ISSN: 1600-5767
    Topics: Geosciences , Physics
    Published by International Union of Crystallography
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  • 8
    facet.materialart.
    Unknown
    Small-angle X-ray scattering from helical macromolecules (1971)
    International Union of Crystallography
    Details
    Publication Date: 1971-08-01
    Description: An earlier calculation of the intensity of small-angle X-ray scattering from helical filaments is extended to give an expression for the intensity from helical macromolecules with a finite cross section. The results are in quite good agreement with an experimental scattering curve for a solution of DNA molecules.
    Print ISSN: 0021-8898
    Electronic ISSN: 1600-5767
    Topics: Geosciences , Physics
    Published by International Union of Crystallography
    Location Call Number Expected Availability
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    PAPER CURRENT
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