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  • 1
    Electronic Resource
    Electronic Resource
    Microwave intermodulation of a superconducting disk resonator (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 86 (1999), S. 4055-4057 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We calculate the third order intermodulation products for the TM010 mode of a thin film disk resonator and discuss the particular case of a 1 GHz resonator in order to obtain a quantitative idea of the performance that can be obtained. The linear and nonlinear microwave responses of a TM010 disk resonator are then compared to that of an equivalent half wavelength microstrip resonator. This analysis allows one to independently quantify the contributions to the nonlinear device performance from the material properties, device size and field configuration. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.371330
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  • 2
    Electronic Resource
    Electronic Resource
    Theory of intermodulation in a superconducting microstrip resonator (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 2002-2009 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The penetration depth and surface resistance of a superconductor depend upon the superfluid current density. This dependence gives rise to nonlinear mixing in a superconducting microstrip resonator. Here we discuss the problem of intermodulation in which two signals at ω1 and ω2, laying within the pass band of a microstrip cavity resonance, mix and generate a signal at 2ω1−ω2. An expression relating the power generated at 2ω1−ω2 to the power transmitted at ω1 and ω2 is given. We focus on the high-Tc superconductors where it is believed that the order parameter has dx2−y2 symmetry. We find for a resonator with a large unloaded Q that intermodulation arises dominantly from the reactive nonlinear inductance of the superconducting film. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.364056
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  • 3
    Electronic Resource
    Electronic Resource
    Theory of microwave intermodulation in a high-Tc superconducting microstrip resonator (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 69 (1996), S. 4248-4250 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We calculate the intermodulation power for a superconducting microstrip resonator arising from the intrinsic microscopic nonlinearities. We focus on high-Tc superconductors where it is believed that the order parameter has dx2−y2 symmetry. A characteristic upturn of the intermodulation power is found at low temperatures. We discuss different ways to reduce intermodulations by changing the geometry of the microstrip. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.116960
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  • 4
    Electronic Resource
    Electronic Resource
    Intermodulation and quality factor of high-Tc superconducting microstrip structures (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 82 (1997), S. 464-468 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The intermodulation power and quality factor Q of high-Tc superconducting microstrip resonators with different shapes is calculated. Acute corners increase the losses and the intermodulation power. The influence of normal conducting regions is investigated. The case of two microstrips carrying in phase or out of phase currents is also studied. The losses and the intermodulation power are significantly reduced if the currents are in phase in the two microstrips compared to the mode with out of phase currents. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.365839
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  • 5
    Electronic Resource
    Electronic Resource
    Relative moment tensor inversion based on ray theory: theory and synthetic tests (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 124 (1996), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: A relative moment tensor inversion is developed for seismic sources belonging to a small source region. The impulsive point-source approximation is assumed to be valid. Input data are amplitudes of low-pass filtered, isolated body-wave phases in the seismograms, and the azimuths and take-off angles of the corresponding rays at the sources. The new aspect of the method is the elimination of Green's functions from the equations. Hence only a minimum of structural information is needed, sufficient to identify correctly phases Pg, PmP, Sg etc. and to determine azimuths and take-off angles. The relative method without reference mechanism is applicable to clusters of seismic sources with different radiation patterns. For source clusters with identical radiation patterns a reference mechanism must be known. The relative method without reference mechanism is studied with synthetic data with regard to additive, Gaussian noise, poor azimuthal station coverage and the resolution of non-double-couple components.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1996.tb06368.x
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  • 6
    Electronic Resource
    Electronic Resource
    On the Elastic and Viscous Properties of Media Containing Strongly Interacting In-plane Cracks (1998)
    Springer
    Pure and applied geophysics 151 (1998), S. 1-16 
    Details
    ISSN: 1420-9136
    Keywords: Key words: Cracks, cracked media, effective moduli.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract. —We calculate elastic moduli and viscosities for media containing strongly interacting in-plane shear cracks. The cracks are randomly oriented or aligned, with equal length or a logarithmic size distribution. Our results from both a boundary element and a finite-element method suggest that the average moduli are best approximated by a differential, self-consistent model (DEM). Thus crack-to- crack interaction, which is considered in the DEM model, is important at high crack densities. This result seems to be different to results obtained from numerical experiments with highly fractured anti-plane shear cracks.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s000240050102
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  • 7
    Electronic Resource
    Electronic Resource
    Effect of Normal-State Pseudogap on Physical Quantities in Hubbard Model for Underdoped High-T c Cuprates (1998)
    Springer
    Journal of low temperature physics 111 (1998), S. 879-893 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We develop the strong-coupling theory of coexisting charge-density-wave (CDW) and superconductivityd-wave gaps within the framework of the FLEX (fluctuation exchange) approximation for the two-dimensional Hubbard model. For nested sections of the Fermi surface these equations reduce to the previous FLEX equations for superconductivity where the squared energy gap s 2 in the denominator of the Green's function is replaced by (φ s 2 + φ c 2 ) (here φs is the superconductivity and φ c the CDW gap). We solve these equations by taking for φ c a phenomenologicald-wave gap. The resulting neutron scattering intensity, spin-lattice relaxation rate 1/T1 , Knight shift, resistivity, and photoemission intensity are in qualitative agreement with the data on underdoped high-Tc cuprates. TheTc for superconductivity decreases and the crossover temperature T* for 1/T1Tincreases with increasing gap amplitude of φ c which is in qualitative agreement with the phase diagram for underdoped cuprates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022229425327
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  • 8
    Electronic Resource
    Electronic Resource
    Isotope effect in the hubbard model for d-wave superconductivity (1996)
    Springer
    Journal of low temperature physics 105 (1996), S. 639-644 
    Details
    ISSN: 1573-7357
    Keywords: 74.20. Mn ; 63.20. Kr ; 74.72.−h ; 74.25. Fy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have solved the generalized Eliashberg equations for the 2D Hubbard model with interactions due to exchange of antiferromagnetic spin fluctuations and harmonic phonons. We calculate the supression of Tc for d-wave superconductivity, the isotope exponent α, and the resitivity ϱ with different models for the phonon interaction α2F(q, ω). The smallest Tc supression and the largest α values are obtained for interactions which are enhanced atq = 0. At lower temperatures the spin-fluctuation interaction is strongly reduced by the phonon interaction due to feed-back effects. We compare our results with the experimental data on high-Tc superconductors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00768456
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  • 9
    Electronic Resource
    Electronic Resource
    Phenomenological Theory of Intermodulation in HTS Resonators and Filters (1999)
    Springer
    Journal of superconductivity 12 (1999), S. 339-351 
    Details
    ISSN: 1572-9605
    Keywords: High-T c superconductors ; nonlinear effects ; microwave resonators and filters
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Recent work on nonlinear effects in microwave resonators and filters from high temperature superconductors, focusing on intermodulations, is reviewed. We calculate the intrinsic nonlinear response of s-wave and d-wave superconductors. A phenomenological description of the lowest order nonlinear behavior in high-T c films in terms of a single parameter, j IMD, is proposed. We show how this description can be used to calculate the intermodulation power arising in realistic microstrip resonators. These calculations show good agreement with measurements on hairpin resonators. This description can also be used for the modeling of nonlinear behavior of complex microwave filters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007749215243
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  • 10
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    Elasto-static simulation of dislocation sources in heterogeneous stress fields and multi-layered media having irregular interfaces (1996)
    In:  Physics and Chemistry of the Earth
    Details
    Publication Date: 2020-02-12
    Keywords: 550 - Earth sciences
    Type: info:eu-repo/semantics/article
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