6,768 research outputs found

    'Cabernet Gernischt' is most likely to be 'Carmenère'

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    Using a set of 32 microsatellite markers, 'Cabernet Gernischt' has been proven to most likely be 'Carmenère', an old grape cultivar from France, and the progeny of 'Cabernet Franc' and 'Gros Cabernet' has been confirmed. In addition, six 'Cabernet Gernischt' clones with different agronomic traits were identified.

    Superconducting gap structure and pinning in disordered MgB2 films

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    We have performed a comparative study of two thin films of magnesium diboride (MgB2) grown by different techniques. The critical current density at different temperatures and magnetic fields was evaluated from magnetisation curves, the structure of superconducting order parameter was obtained from point-contact spectroscopy, and the scattering rates were evaluated by fitting the temperature dependent normal-state resistivity to the two-band model. The films have similar critical temperatures close to 39 K, but the upper critical fields were different by a factor of 2 (5.2T and 2.5 T at 20 K). We have found that the film with higher Hc2 also had stronger scattering in the sigma band and smaller value of the superconducting gap in this band. As the scattering in sigma band is primarily due to the defects in boron plane, our results are consistent with the assumption that disordering the boron planes leads to enhanced Hc2 and better pinning properties in magnetic field.Comment: Paper presented at EUCAS'0

    Susceptibility of Chinese grapes to grape phylloxera

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    Research Note

    An improved continuous compositional-spread technique based on pulsed-laser deposition and applicable to large substrate areas

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    A new method for continuous compositional-spread (CCS) thin-film fabrication based on pulsed-laser deposition (PLD) is introduced. This approach is based on a translation of the substrate heater and the synchronized firing of the excimer laser, with the deposition occurring through a slit-shaped aperture. Alloying is achieved during film growth (possible at elevated temperature) by the repeated sequential deposition of sub-monolayer amounts. Our approach overcomes serious shortcomings in previous in-situ implementations of CCS based on sputtering or PLD, in particular the variations of thickness across the compositional spread and the differing deposition energetics as function of position. While moving-shutter techniques are appropriate for PLD-approaches yielding complete spreads on small substrates (i.e. small as compared to distances over which the deposition parameters in PLD vary, typically about 1 cm), our method can be used to fabricate samples that are large enough for individual compositions to be analyzed by conventional techniques, including temperature-dependent measurements of resistivity and dielectric and magnetic and properties (i.e. SQUID magnetometry). Initial results are shown for spreads of (Sr,Ca)RuO3_3.Comment: 6 pages, 8 figures, accepted for publication in Rev. Sci. Instru

    On the error term in Weyl's law for the Heisenberg manifolds (II)

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    In this paper we study the mean square of the error term in the Weyl's law of an irrational (2l+1)(2l+1)-dimensional Heisenberg manifold . An asymptotic formula is established
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