ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • 2020-2022
  • 1995-1999
  • 1980-1984
  • 1975-1979  (4)
  • 1940-1944
  • 1975  (4)
Collection
Keywords
Publisher
Years
  • 2020-2022
  • 1995-1999
  • 1980-1984
  • 1975-1979  (4)
  • 1940-1944
Year
  • 1
    Electronic Resource
    Electronic Resource
    Pure bending of helically wound ideal fibre-reinforced cylinders (1975)
    Springer
    Journal of elasticity 5 (1975), S. 287-296 
    Details
    ISSN: 1573-2681
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary An ideal fibre-reinforced material is defined to be inextensible in one or more directions through each point of the material. It has been found to be a good model for predicting the deformation and stresses produced in real materials which are very much stronger in resisting extension in those directions than in any other possible mode of deformation. We consider a circular cylindrical tube of incompressible ideal fibre-reinforced material in which the reinforcement throughout its thickness is directed along two families of helices making angles ±ϕ with the axis of the cylinder. It is shown that the kinematic constraints allow pure bending deformations, and the solution for a linearly elastic reinforced cylinder is explicitly determined. This kinematically admissible deformation is also statically admissible, and can be supported (or produced) solely by the action of bending couples on the ends of the cylinder. The bending moment-curvature relation is deduced, and compared with the Euler-Bernoulli equation for prismatic beams. The effect of different values of the winding angle ϕ is discussed, and we show that the case tan φ=√2 is of particular importance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00126992
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    facet.materialart.
    Unknown
    The response of single human cells to zero gravity (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Twenty separate cultures of Wistar-38 human embryonic lung cells were exposed to a zero-gravity environment on Skylab for periods of time ranging from one to 59 days. Duplicate cultures were run concurrently as ground controls. Ten cultures were fixed on board the satellite during the first 12 days of flight. Growth curves, DNA microspectrophotometry, phase microscopy, and ultrastructural studies of the fixed cells revealed no effects of a zero-gravity environment on the ten cultures. Two cultures were photographed with phase time lapse cinematography during the first 27 days of flight. No differences were found in mitotic index, cell cycle, and migration between the flight and control cells. Eight cultures were returned to earth in an incubated state. Karyotyping and chromosome banding tests show no differences between the flight and control cells.
    Keywords: AEROSPACE MEDICINE
    Type: Skylab science experiments; Symposium; Feb 28, 1974; San Francisco, CA
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 3
    facet.materialart.
    Unknown
    The effect of grazing flow on the steady state resistance of square-edged orifices (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A simple inviscid interaction model has been developed which uses thin airfoil theory to account for pressure forces exerted at the interface between the orifice and grazing flow together with a one-dimensional discharge coefficient concept. The effect of grazing flow boundary layer thickness was also included in the model. Resistance measurements for a wide range of grazing flow speeds and orifice flow rates collapse into a single curve when plotted in terms of effective discharge coefficient versus orifice-to-grazing velocity ratio. The correlation curves for inflow and outflow are different. Data for clustered orifices collapse in the same way as the single orifice. The effect of boundary layer thickness is compared with model predictions. The effect of orifice length-diameter ratio is shown to be significant for inflow but negligible for outflow.
    Keywords: ACOUSTICS
    Type: AIAA PAPER 75-493 , American Institute of Aeronautics and Astronautics, Aero-Acoustics Conference; Mar 24, 1975 - Mar 26, 1975; Hampton, VA
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 4
    facet.materialart.
    Unknown
    Fluid mechanical model of the acoustic impedance of small orifices (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A fluid mechanical model of the acoustic behavior of small orifices is presented which predicts orifice impedance as a function of incident sound pressure level, frequency, and orifice geometry. Agreement between predicted and measured values (in both water and air) of orifice impedance is excellent. The model shows that (1) the acoustic flow in the immediate neighborhood of the orifice can be modelled as a locally spherical flow, (2) within this near field, the flow is, to a first approximation, unsteady and incompressible, and (3) at very low sound pressure levels, the orifice viscous resistance is directly related to the effect of boundary-layer displacement along the walls containing the orifice, and the orifice reactance is directly related to the inertia of the oscillating flow in the orifice neighborhood.-
    Keywords: ACOUSTICS
    Type: AIAA PAPER 75-495 , American Institute of Aeronautics and Astronautics, Aero-Acoustics Conference; Mar 24, 1975 - Mar 26, 1975; Hampton, VA
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...