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  • 1
    Electronic Resource
    Electronic Resource
    Fluxon pinning in annular Josephson junctions by an external magnetic field (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 1335-1340 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The behavior of long annular Josephson junctions with various numbers n of trapped fluxons is studied in the presence of a uniform external magnetic field parallel to the plane of the junction's tunnel barrier. We report on measurements of the magnetic dependencies of the critical current and current–voltage characteristics with different n. Experimental results are explained by the model assuming that a barrier-parallel magnetic field produces potential wells for fluxons and antifluxons at the opposite locations. We also present numerical simulations using the perturbed sine-Gordon equation with an additional magnetic-field-induced term. Good agreement is found between the measured critical current versus magnetic-field dependencies and the numerical simulations. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.363868
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  • 2
    Electronic Resource
    Electronic Resource
    Low-frequency flux noise and visualization of vortices in a YBa2Cu3O7 dc superconducting quantum interference device washer with an integrated input coil (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 78 (2001), S. 3645-3647 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We used low-temperature scanning electron microscopy (LTSEM) for imaging quantized magnetic flux (vortices) in dc superconducting quantum interference devices (SQUIDs) with approximately 1 μm spatial resolution at temperature T=77 K in a controllable magnetic field up to 20 μT. We demonstrate that LTSEM allows to image the spatial distribution of vortices in a YBa2Cu3O7/SrTiO3/YBa2Cu3O7 multilayer thin-film structure consisting of a dc SQUID washer with an integrated input coil on top. Simultaneously, we are able to measure the low-frequency noise of the sample under test, which allows to correlate the spatial distribution of vortices with low-frequency noise in the SQUID. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1378048
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  • 3
    Electronic Resource
    Electronic Resource
    Construction of a cassette enabling regulated gene expression in the presence of aromatic hydrocarbons
    Amsterdam : Elsevier
    Plasmid 27 (1992), S. 191-199 
    Details
    ISSN: 0147-619X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0147-619X(92)90021-2
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  • 4
    Electronic Resource
    Electronic Resource
    Measurement of tectonic rock strain in Iceland
    Amsterdam : Elsevier
    Catena 15 (1988), S. 207-216 
    Details
    ISSN: 0341-8162
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Geography , Geosciences
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0341-8162(88)90045-8
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  • 5
    Electronic Resource
    Electronic Resource
    A new measurement of the center-to-limb variation of the rms granular contrast (1977)
    Springer
    Solar physics 53 (1977), S. 359-368 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The center-to-limb variation of the root-mean-square granular contrast at 5520 Å is deduced from a set of high-spatial-resolution filtergrams obtained with the Sacramento Peak Observatory Vacuum Tower Telescope. The rms contrast is observed to decrease monotonically between μ = 1.0 and 0.6, and then increase slightly at μ = 0.4. This result is compared with the results of Edmonds (1962) and with the results of Pravdjuk et al. (1974).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00160279
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  • 6
    Electronic Resource
    Electronic Resource
    On the interpretation of Fraunhofer line Doppler shifts at supergranule boundaries (1984)
    Springer
    Solar physics 92 (1984), S. 33-46 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have used the SPO tower telescope and echelle spectrograph to study differences in the profiles of three Fei lines, between magnetic network and cells. Ca K slit-jaw pictures were used to identify the network and cell areas, and mean network and cell profiles were computed from digitized spectra for the g = 0 lines λλ4065, 5434, and the g = 1.5 line λ 5233. The profile bisectors show that the wings of all three lines are red-shifted in the network by between 75–200 m s−1 relative to the cell profiles. But the redshift decreases in the line core and becomes less than the standard error of 20 m s−1 near the line core minimum. This disappearance of the redshift at the cores of all 3 lines formed over the height range 250–500 km above τ 0.5 = 1, argues against a steady downflow at supergranule boundaries. We show that such red-shifted wings and a relatively unshifted core can result if granular convection is suppressed near the network flux tubes, without implying any downflow in the vicinity of these flux tubes. Our results also indicate that searches for large-scale convective velocity patterns should measure shifts of the line core, rather than the line wings which appear to be very sensitive to inhomogeneities in granule structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00157232
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  • 7
    Electronic Resource
    Electronic Resource
    Photospheric line asymmetry and granular velocity models (1981)
    Springer
    Solar physics 69 (1981), S. 213-221 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We analyze spectral line profiles obtained from regions of the solar surface exhibiting either an upflow or a downflow on a spatial and temporal scale corresponding to the white-light granulation. The differences between their line bisectors are measured to quantify changes in the asymmetry of the profile resulting from granular motion. The observed bisector differences are compared with differences predicted using conflicting granular models. Models, in which the motion of large, long-lived granules decreases rapidly with increasing height in the photosphere, are compatible with the observed line profile asymmetries.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00149989
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  • 8
    Electronic Resource
    Electronic Resource
    On the evaluation of elasto-plastic strains measured with strain gages (1979)
    Springer
    Experimental mechanics 19 (1979), S. 265-270 
    Details
    ISSN: 1741-2765
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The analysis of plane-stress conditions using strain gages is feasible even when the deformations of the materials are in the elasto-plastic range. The calculation of stresses from the measured strain values is based on an analysis which requires knowledge of the stress-strain curve of the material as obtained from a uniaxial tensile test. In this paper, the practical procedure of such an analysis is described together with the application of a nomograph to allow a simplified evaluation to be made of the results of measurements. A numerical example is also given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02324285
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  • 9
    Electronic Resource
    Electronic Resource
    On the calibration of line-of-sight magnetograms (1993)
    Springer
    Solar physics 146 (1993), S. 207-227 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Inference of magnetic fields from very high spatial, spectral, and temporal resolution polarized images is critical in understanding the physical processes that form and evolve fine scale structures in the solar atmosphere. Studying high spectral resolution data also helps in understanding the limits of lower resolution spectral data. We compare three different methods for calibrating the line-of-sight component of the magnetic field. Each method is tested for varying degrees of spectral resolution on both synthetic line profiles computed for known magnetic fields and real data. The methods evaluated are: (a) the differences in the center of gravity of the right and left circular components for different spectral resolution, (b) conversion of circular polarization, at particular wavelengths, to magnetic fields using model-dependent numerical solutions to the equations of polarized radiative transfer, and (c) the derivative method using the weak field approximation. Each method is applied to very high spatial and spectral resolution circular polarization images of an active region, acquired in the Fei 5250 Å Zeeman-sensitive spectral line. The images were obtained using the 20 mÅ pass-band tunable filter at NSO/Sacramento Peak Observatory Vacuum Tower Telescope. We find that the center-of-gravity separation offers the best way of inferring the longitudinal magnetic field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00662010
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  • 10
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    Low-frequency flux noise and visualization of vortices in a YBa2Cu3O7 dc superconducting quantum interference device washer with an integrated input coil (2001)
    American Institute of Physics
    Details
    Publication Date: 2001-06-04
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
    Published by American Institute of Physics
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