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  • MECHANICAL ENGINEERING  (3)
  • METALLIC MATERIALS  (2)
  • Acinetobacter Species  (1)
  • 1975-1979  (6)
  • 1
    Electronic Resource
    Electronic Resource
    Microbial assimilation of hydrocarbons (1975)
    Springer
    Archives of microbiology 102 (1975), S. 85-90 
    Details
    ISSN: 1432-072X
    Keywords: Intracytoplasmic Membranes ; Membrane Induction ; Hydrocarbon Oxidation ; Acinetobacter Species
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract 1. The induction of intracytoplasmic membranes was demonstrated to occur in Acinetobacter sp. when grown on hexadecane, heptadecane, and hexadec-1-ene. 2. Evidence for a physical relationship between the cytoplasmic hydrocarbon “pools” and the intracytoplasmic membranes is presented. 3. The specificity of the cytoplasmic pooling of hydrocarbons and the induction of intracytoplasmic membranes was investigated in relationship to hydrocarbon oxidation. 4. These results suggest that both processes are required for the growth of Acinetobacter sp. on hydrocarbons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00428350
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    Paper (German National Licenses)
    Fulltext
  • 2
    facet.materialart.
    Unknown
    Effect of design factors on surface temperature and wear in disk brakes (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The temperatures, friction, wear and contact conditions that occur in high energy disk brakes are studied. Surface and near surface temperatures were monitored at various locations in a caliper disk brake during drag type testing, with friction coefficient and wear rates also being determined. The recorded transient temperature distributions in the friction pads and infrared photographs of the rotor disk surface both showed that contact at the friction surface was not uniform, with contact areas constantly shifting due to nonuniform thermal expansion and wear. The effect of external cooling and of design modifications on friction, wear and temperatures was also investigated. It was found that significant decreases in surface temperature and in wear rate can be achieved without a reduction in friction either by slotting the contacting face of the brake pad or by modifying the design of the pad support to improve pad compliance. Both design changes result in more uniform contact conditions on the friction surface.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-CR-134923
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
    facet.materialart.
    Unknown
    Evaluation of materials and design modifications for aircraft brakes (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A test program is described which was carried out to evaluate several proposed design modifications and several high-temperature friction materials for use in aircraft disk brakes. The evaluation program was carried out on a specially built test apparatus utilizing a disk brake and wheel half from a small het aircraft. The apparatus enabled control of brake pressure, velocity, and braking time. Tests were run under both constant and variable velocity conditions and covered a kinetic energy range similar to that encountered in aircraft brake service. The results of the design evaluation program showed that some improvement in brake performance can be realized by making design changes in the components of the brake containing friction material. The materials evaluation showed that two friction materials show potential for use in aircraft disk brakes. One of the materials is a nickel-based sintered composite, while the other is a molybdenum-based material. Both materials show much lower wear rates than conventional copper-based materials and are better able to withstand the high temperatures encountered during braking. Additional materials improvement is necessary since both materials show a significant negative slope of the friction-velocity curve at low velocities.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-CR-134896
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
    facet.materialart.
    Unknown
    Evaluation of aircraft brake materials (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A test program was carried out to evaluate several new high-temperature friction materials for use in aircraft disk brakes. A specially built test apparatus utilizing a disk brake and wheel half from a small jet aircraft was used. The apparatus enabled control of brake pressure, velocity and braking time. Tests were run under both constant and variable velocity conditions and covered a kinetic energy range similar to that encountered in aircraft brake service. The materials evaluation showed that two newly developed friction materials show potential for use in aircraft disk brakes. One of the materials is a nickel-based sintered composite, while the other is a molybdenum-based material. Both materials show much lower wear rates than conventional copper-based materials and are better able to withstand the high temperatures encountered during braking. Additional materials improvement is necessary, however, since both materials show a significant negative slope of the friction-velocity curve at low velocities.
    Keywords: METALLIC MATERIALS
    Type: ASLE PREPRINT 77-LC-6B-2 , Joint Lubrication Conference; Oct 03, 1977 - Oct 05, 1977; Kansas City, MO; US
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
    facet.materialart.
    Unknown
    Influence of temper condition on the nonlinear stress-strain behavior of boron-aluminum (1977)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The influence of temper condition on the tensile and compressive stress-strain behavior for six boron-aluminum laminates was investigated. In addition to monotonic tension and compression tests, tension-tension, compression-compression, and tension--compression tests were conducted to study the effects of cyclic loading. Tensile strength results are a function of the laminate configuration; unidirectional laminates were affected considerably more than other laminates with some strength values increasing and others decreasing.
    Keywords: METALLIC MATERIALS
    Type: NASA-TM-X-74753 , VPI-E-77-18 , TR-8
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Unknown
    Phase change in liquid face seals (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A study is made of boiling (or phase change) in liquid face seals. An appropriate model is set up and approximate solutions obtained. Some practical illustrative examples are given. Major conclusions are that (1) boiling may occur more often than has been suspected particularly when the sealed liquid is near saturation conditions, (2) the temperature variation in a seal clearance region may not be very great and the main reason for boiling is the flashing which occurs as the pressure decreases through the seal clearance, and (3) there are two separate values of the parameter film-thickness/angular-velocity-squared (and associated radii where phase change takes place) which provide the same separating force under a given set of operating conditions. For a given speed seal face excursions about the larger spacing are stable, but excursions about the smaller spacing are unstable, leading to a growth to the larger spacing or a catastrophic collapse.
    Keywords: MECHANICAL ENGINEERING
    Type: ASME PAPER 77-LUB-12
    Format: text
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