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  • 1
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    Proteomic analysis provides integrated insight into mechanisms of Turnip mosaic virus long distance movement in Brassica rapa (2019)
    Springer
    Details
    Publication Date: 2019-01-19
    Print ISSN: 0006-3134
    Electronic ISSN: 1573-8264
    Topics: Biology
    Published by Springer
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    PAPER CURRENT
  • 2
    Electronic Resource
    Electronic Resource
    Probe the vortex state of YBa2Cu3O7−δ under small magnetic field using short time magnetic moment relaxation method (abstract) : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 5874-5874 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: At the present time, there is a large amount of convergent experimental evidence pointing toward the existence of a vortex-glass state in the high temperature superconductor YBa2Cu3O7−δ in the presence of a high magnetic field, as predicted by Fisher1 and Fisher et al.2 However, the situation at low magnetic field is not so clear. The nature of the vortex state separating the Meissener state at low field and the vortex-glass state at very high field remains unsolved both theoretically and experimentally. To shed some light to this problem, we have measured the remnant magnetic moment relaxation of melt-textured bulk YBa2Cu3O7−δ samples in various magnetic fields from ∼10−4 to ∼300 s. Even at zero field, the time dependence of the relaxation follows the vortex-glass model prediction m(t)∝1/[ln(t)]1/μ but with a μ=1.4±0.2, contradicting the vortex-glass model. As the field is increased, the μ value decreases until it reaches a value of ∼0.2–0.3 above 1 T. The larger than one value of μ seems to point to a collective pinning behavior at low magnetic field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353557
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of temperature on nonlinear optical properties of composite media with shape distribution (2002)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 91 (2002), S. 2045-2050 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The temperature dependence of the effective nonlinear optical properties is investigated in random metal/dielectric composites with a shape distribution of particles through the spectral representation. We adopt the Maxwell–Garnett model with a uniform shape distribution and obtain an analytical expression for the spectral density function. Numerical results show that the optical nonlinearity enhancement decreases with the increase of temperature, accompanied by a slight blueshift of the resonant peak. Such a temperature dependence results from the following changes: the conduction electron scattering frequency (due to electron–electron and electron–phonon interaction) and the plasmon frequency (due to the expansion of metal) with the temperature. We find that the former change plays a more important role in understanding the temperature-dependent optical nonlinearity. Moreover, exact results in the dilute limit show a larger magnitude and a more rapid decrease of the optical nonlinearity with temperature, in comparison with the predictions of the mean field approximation. Our results indicate that by decreasing the temperature, it is possible to achieve a large optical nonlinearity. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1436555
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  • 4
    Electronic Resource
    Electronic Resource
    Effects of highly conducting interface and particle size distribution on optical nonlinearity in granular composites (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 88 (2000), S. 1893-1899 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The optical nonlinearity has been investigated in granular metal/dielectric composites taking the effects of highly conducting interfaces between the constituent phases as well as the distribution of particle sizes into account. We compute analytically the spectral function for composites with a binary distribution of particle sizes. For a log-normal distribution of width σ, numerical results show that the spectral density m(s) changes from a delta function for zero width to a prominent peak, accompanied by a broad spectrum for a finite width σ. As a result, the locations of the nonlinearity enhancement peak and the absorption spectrum shift to small frequencies with the increase of the interfacial factor I. The strength of the absorption and the optical nonlinearity are always decreased near resonance with the increase of σ, while the absorption peak and optical nonlinearity peak shift to smaller volume fraction f as I is increased. Moreover, the variation of I will further increase the optical absorption (optical nonlinearity) by more than one (three) order of magnitude, depending on the volume fractions. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1305856
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  • 5
    Electronic Resource
    Electronic Resource
    Hydrostatic pressure on HgBa2CaCu2O6+δ and HgBa2Ca2Cu3O8+δ : The 6th joint magnetism and magnetic materials (MMM)-intermag conference (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 6941-6943 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The superconducting transition temperature Tc and its pressure dependence dTc/dP of HgBa2CaCu2O6+δ (Hg-1212) and HgBa2Ca2Cu3O8+δ (Hg-1223) were measured up to 17 kbar. Tc increases with pressure approximately linearly for both compounds before oxidation. However, the nonlinearity in the Tc-P correlation shows up after oxidation in both compounds. For Hg-1212, the average dTc/dP decreases as oxygen doping increases, while it increases in Hg-1223. These observations are in conflict with the modified pressure-induced charge-transfer model, but might be attributed to the possible existence of fine electronic structure. These observations suggest that a Tc much higher than 140 K might be achievable in Hg-1223 by means of higher physical or chemical pressure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358122
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  • 6
    Electronic Resource
    Electronic Resource
    Electrodeposition and characterization of magnetic Ni-Fe thin films on InP(100) surfaces (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 5795-5799 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Electrodeposited magnetic Ni-Fe films are used in storage devices and are applicable as magnetic sensors. In this work, we demonstrate the electrochemical conditions for deposition of permalloy Ni-Fe nanocrystalline films onto InP(100) surfaces. The prepared Ni-Fe films were analyzed by scanning electron microscopy to determine surface morphology and by Auger electron spectroscopy for compositional depth profiling. Permalloy films with bulk composition of 81% Ni and 18% Fe were obtained by electrodeposition at −1.2 V (versus standard calomel electrode) in a bath of 0.5 M NiSO4, 0.02 M FeSO4, 0.4 M H3BO3, pH=3. Transmission electron microscopy measurements show that these films consist of fcc Ni-Fe nanocrystallites embedded in an amorphous matrix. The films also show good magnetic hysteresis loops, with low coercivity. The magnetic properties of these films are improved by an extended anneal at 100 °C. Interdiffusion occurred between Ni-Fe and the InP substrate after the sample was heated to 300 °C, and consequently a loss of ferromagnetic behavior was observed. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.359643
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  • 7
    Electronic Resource
    Electronic Resource
    Comparison between the magnetic and transport critical current densities in high critical current density melt-textured yttrium barium copper-oxide (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 58 (1991), S. 92-94 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Using our recently developed pulsed critical current density (Jc) measuring system, the Jc of the high Jc melt-textured YBa2Cu3O7−δ (Y123) bulk samples has been determined. I-V curves with a voltage resolution of 0.5 μV were obtained, and transport Jc's along the a-b plane (Jc(parallel) a-b) as high as 7.2×1 04 A/cm2 were extracted. These results are comparable to the values obtained magnetically. On the other hand, transport Jc along the c axis (Jc(parallel)c) were found to be two orders of magnitude smaller, even though the magnetic Jc(parallel)c is only about five times smaller than Jc(parallel)a-b. We suggest that for the high-temperature superconducting materials which are highly anisotropic, caution should be taken when using the nontransport magnetic methods to determine Jc.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.104401
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  • 8
    Electronic Resource
    Electronic Resource
    High current density in bulk YBa2Cu3Ox superconductor (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 54 (1989), S. 2352-2354 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A liquid phase processing method for the fabrication of bulk YBa2Cu3Ox superconductors with large current carrying capacity has been developed. Slow cooling through the peritectic transformation (1030–980 °C) has been shown to control the microstructure of these superconductors. A cooling rate of 1 °C/h in this temperature range has yielded a microstructure with long plate type, thick grains oriented over a wide area. Current density up to 18 500 A/cm2 has been obtained by continuous direct current measurements and in excess of 62 000 A/cm2 with pulse current of 10 ms duration and 75 000 A/cm2 using 1 ms pulse. The strong magnetic field dependence observed in sintered bulk 1-2-3 superconductors is also minimized to a large extent where a current density in excess of 37 000 A/cm2 is obtained in a field of 6000 G.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.101525
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  • 9
    Electronic Resource
    Electronic Resource
    Unusually large shielding fields in single-grain YBa2Cu3O7−δ (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 65 (1994), S. 907-909 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetic field trapping and shielding by several unirradiated single-grain YBa2Cu3O7−δ disks have been investigated between 4.2 and 71 K up to 20 T. Flux avalanches due to thermal instabilities limited the trapping field to ∼5 T below 45 K and often caused microcracks in the disks. However, a shielding field greater than 19 T was detected at 4.2 K in the same sample assembly even after it was damaged by flux avalanches. This violates the expected symmetry between shielding and trapping fields. The shielding field of (approximately-greater-than)19 T exceeds the total quench field of 10 T predicted by the Swartz–Bean model. The observations suggest that thermomechanical properties play an important role in field shielding and trapping and mechanical stress may be effectively used to enhance the field trapped by disks of high temperature superconductors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.112197
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  • 10
    Electronic Resource
    Electronic Resource
    High magnetic field trapping in monolithic single-grain YBa2Cu3O7−δbulk materials (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 63 (1993), S. 260-262 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Results of our study on high magnetic field trapping in unirradiated, high quality monolithic single-grain YBa2Cu3O7−δ disks are reported. A record high 4 T trapped field at the surface of the unirradiated disks is observed. However, below 11 K, large flux avalanches caused by thermal instability severely limit the remnant trapped field. Therefore, flux avalanche, rather than Jc×d, dictates the maximum trapped field at low temperatures. To overcome this problem, a strong high temperature superconductor trapped field magnet is proposed. A novel application of the avalanche effect is also mentioned.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.110360
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