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  • 1985-1989  (8)
  • 1988  (8)
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  • 1985-1989  (8)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Laser interferometer for the study of piezoelectric and electrostrictive strains (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 2492-2496 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A modified Michelson interferometer is used to study the strain properties of piezoelectric and electrostrictive materials. For small displacement, a feedback loop is introduced to stabilize the system against the low-frequency optical path-length drifting and the system is capable of resolving displacements of the order of 10−3 A(ring). For the strain induced by domain switching, a dual-channel signal detection scheme is used which automatically reads out the displacement of the sample. The effect on the measurement of the sample bonding to a substrate and other related problems are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.341027
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Doping effects of 3D metal on single-phase YBa2Cu3O7−δ (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 3589-3592 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The measurements of x-ray diffraction, the temperature dependence of the dc resistance and the ac susceptibility have been performed for the single-phase 3D-metal doping systems YBa2 Cu3−x Mx Oy (M=Fe, Co, and Ni; x=0.025, 0.05, 0.075, 0.10, 0.25, and 0.50 for Ni and Co and 0.05, 0.075, 0.10, 0.15, and 0.20 for Fe). With an increase of impurity content, two structural transitions were observed for the Co and Fe dopants but only one for the Ni dopant. The resistivity in the normal state changes from metallic to semiconductinglike behavior and the depression of Tc is linear with the impurity concentration (x) when x〈0.10. A weak Curie–Weiss type paramagnetism, which is enhanced with impurity content, exists in the samples studied. Incorporating other work on oxygen defects, we suggest that a change of oxygen content induced by doping was the dominant effect on superconductivity in these samples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.341393
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Domain wall excitations and their contributions to the weak-signal response of doped lead zirconate titanate ceramics (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 6445-6451 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The ac field dependence of the polarization and strain responses of three different compositions of doped lead zirconate titanate ceramics were measured for samples in both the poled and the depoled states. The results indicate that a reversible domain wall excitation exists which contributes to the weak-signal response of these materials. Irreversible domain wall motion can be excited within the frequency range measured by applying a field above a threshold field, which is much smaller than the coercive field. Therefore, the weak-signal linear dielectric, piezoelectric, and elastic coefficients of these materials may not provide a suitable description of their behavior when the external applied field exceeds this threshold field. All the observed phenomena can be explained by thermally activated domain wall fluctuations and nucleations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342059
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    The dynamics of bubble growth for Rayleigh–Taylor unstable interfaces (1988)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 31 (1988), S. 447-465 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A statistical model is analyzed for the growth of bubbles in a Rayleigh–Taylor unstable interface. The model is compared to solutions of the full Euler equations for compressible two phase flow, using numerical solutions based on the method of front tracking. The front tracking method has the distinguishing feature of being a predominantly Eulerian method in which sharp interfaces are preserved with zero numerical diffusion. Various regimes in the statistical model exhibiting qualitatively distinct behavior are explored.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.866826
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Photodissociation of semiconductor positive cluster ions (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 1670-1677 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Laser photofragmentation of Si, Ge, and GaAs positive cluster ions prepared by laser vaporization and supersonic beam expansion has been investigated using tandem time-of-flight mass spectrometry. Si clusters up to size 80, Ge clusters to size 40, and GaAs clusters up to a total of 31 atoms were studied. Si+n and Ge+n for n=12–26 give daughter ions of about half their original size. For both Si and Ge, this apparent positive ion fissioning appears to go over with increasing n to neutral loss of seven and ten, but for Si+n the range of n values where this is observed is rather small. At low fluences, the larger Ge+n clusters up to the maximum size observed (50) sequentially lose Ge10 (and in some cases with lower intensity Ge7). Larger Si+n clusters (n〉30) always fragment primarily to produce positive ion clusters in the 6–11 size range with a subsidiary channel of loss of a single Si atom. At high laser fluences, Ge+n also fragments to produce primarily positive ion clusters in the 6–11 size range with an intensity pattern essentially identical to Si+n at similar fluences. GaxAs+y clusters lose one or more atoms in what is probably a sequential process with positive ion clusters in which the total number of atoms, x+y, is odd being more prominent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.454145
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    On the detection of a signal in colored noise (1988)
    Springer
    Circuits, systems and signal processing 7 (1988), S. 467-479 
    Details
    ISSN: 1531-5878
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract A modeling approach is used in the detection of a random signal in colored noise. The received sequence is modeled as a regressive/autoregressive time series, and the presence or absence of the desired signal is determined through a hypothesis testing procedure. The test is based on the construction of anF-statistic using likelihood functions. The statistic can be easily incorporated into the computation of the probability of a false alarm, such as required in the processing of radar signals. Results based on simulated data and actual radar data are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01599921
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Phase diagram of the CsCl-RbCl system (1988)
    Springer
    Journal of materials science 23 (1988), S. 2905-2907 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract As part of the systematic research on the phase stability of alkali halides, the phase diagram of the CsCl-RbCl system was determined by using differential scanning calorimetry (DSC) with the help of high-temperature X-ray diffractometry. It is indicated from the phase diagram that the CsCl-enriched solid solution which possesses rocksalt structure and the RbCl-enriched solid solution which also possesses rocksalt structure separate into two phases below 803 K. It is stressed that the elimination of the thermal hysteresis by annealing is important in the precise determination of phase diagram of this system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00547466
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Grain boundary Josephson effect in ceramic superconductor GdBa2Cu3O7−y (1988)
    Springer
    The European physical journal 71 (1988), S. 53-56 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The current-carrying nature and its response to the weak magnetic field and temperature of the highT c ceramic superconductor GdBa2Cu2O7−y have been investigated by measuring theI–V characteristics in different magnetic fields and at different temperatures. The experimental results show that the critical curent density is very sensitive to the weak magnetic field. The behaviors ofI c (H) andI c (T) are all of the Josephson-junction-like features. Some explanations are given based on the model of the S−N−I−N−S weak-link junction network.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01310843
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    Paper (German National Licenses)
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