Library

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
  • Electronic Resource  (3)
  • 1995-1999
  • 1985-1989  (3)
  • 1985  (3)
Source
Material
  • Electronic Resource  (3)
Years
  • 1995-1999
  • 1985-1989  (3)
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Influence of biasing stresses on the propagation of surface waves (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 767-776 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: It is known that the propagation characteristics of elastic waves are influenced by the nature of biasing stress distributions in the propagating medium. A knowledge of the magnitude of such effects plays an important role in improving the performance and long term aging characteristics of surface acoustic wave (SAW) devices. Generally, SAW devices employ thin platelike structures as the propagating medium of surface waves. The biasing deformation of such structures due to externally applied forces can be decomposed into extensional and flexural deformations which can have substantially different effects on the change in the time delay between two observations points. This paper describes a study of the fractional change in the time delay of surface waves due to the stress components in terms of which a general deformation can be expressed. The information on the biasing state of thin disks has been employed in a previously reported perturbation procedure for equations of motion for small dynamic field superposed on a static bias. Computational results have been obtained for fractional changes in the time delay of surface waves in crystalline quartz of various orientations and propagation directions due to many simple stress systems in thin disks. We have considered the cases of flexural deformation of rectangular plates due to cylindrical bending and disks subjected to normal pressures, as well as extensional deformation due to a pair of forces acting diametrically on a circular disk along various azimuthal angles. Experimental results have been obtained for the moment-frequency effect on circular ST-cut quartz disks and the force-frequency effects on both singly, as well as doubly rotated quartz disks. Good agreement has been obtained between the theoretical predictions and experimental measurements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.334725
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    UBV photometry of DX Aquarii (1985)
    Springer
    Astrophysics and space science 111 (1985), S. 225-236 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract U, B, V photometry of the eclipsing binary DX Aqr has been presented for the first time. The period of the system comes out to be nearly half the period given by Strohmeier (1966) and a value of Od.472502 has been determined. The colour of the system has been discussed. The primary eclipse is a total occulation. The orbit seems to be eccentric. The system belongs to Algol type. DX Aqr may be a very complicated system. The present results are considerably different from those of earlier investigations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00649967
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Production of high energy deuterons in the reaction:3He+3He→4He+2H+e ++v (1985)
    Springer
    The European physical journal 321 (1985), S. 381-388 
    Details
    ISSN: 1434-601X
    Keywords: 25.55.−e ; 25.55 Ek ; 25.10.+s
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Experiments on the reaction:3He+3He→4He+2He using a single four detector telescope have shown evidence for the production of deuteron pulses, consistent with the2He→2H+e++v fusion reaction in the final state. New measurements on the same reaction using improved techniques viz.A) a windowless3He gas target andB) α- d correlation detection with 5 ns resolving time and antipileup circuitry have been performed. Calibrations were obtained from the7Li+3He→2H+4He+4He reaction spectra. The correlation angles were 30° and 97° for the alphas and deuterons respectively. Deuteron pulses have been observed, correlated with alpha particles. A cross section of (1.7 ±0.5)nbsr−1MeV−1 was obtained consistent with previous measurements using a single telescope.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01411968
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...