42,267 research outputs found

    Influence of Correlated Hybridization on the Conductance of Molecular Transistors

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    We study the spin-1/2 single-channel Anderson impurity model with correlated (occupancy dependent) hybridization for molecular transistors using the numerical renormalization-group method. Correlated hybridization can induce nonuniversal deviations in the normalized zero-bias conductance and, for some parameters, modestly enhance the spin polarization of currents in applied magnetic field. Correlated hybridization can also explain a gate-voltage dependence to the Kondo scale similar to what has been observed in recent experiments.Comment: 4 pages, 5 figure

    Behavior of a sandy clay under vertical impact of geometric shapes

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    Sandy clay response under vertical impact of cone, plate, and plane geometric shape

    The living words of the living master: Sants, Sikhs, Sachkhand Nanak Dham and the academy

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    This article investigates a new religious movement, Sachkhand Nanak Dham, by comparing it with Sikhism. It argues that Sachkhand Nanak Dham has affinities with both Punjabi popular religiosity and Sikh sectarian movements. Further, it argues that Sachkhand Nanak Dham today is similar to an earlier stage in the development of Sikhism. It provides an account of the life and work of the founder of Sachkhand Nanak Dham, Mahraz Darshan Das Ji, and identifies significant continuities with the life and work of the founder of Sikhism, Guru Nanak, suggesting that these continuities may be explained by reference to the Sant tradition. Finally, the article speculates about the future development of Sachkhand Nanak Dham, specifically whether it can avoid the fate of becoming a ‘religion’, according to Mahraz Darshan Das Ji, an institutionalised orthodoxy antithetical to revelatory insight, and in so doing considers the possibility of a new lineage of living Masters

    Polycyclic aromatic hydrocarbons and molecular hydrogen in oxygen-rich planetary nebulae: the case of NGC6720

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    Evolved stars are primary sources for the formation of polycyclic aromatic hydrocarbons (PAHs) and dust grains. Their circumstellar chemistry is usually designated as either oxygen-rich or carbon-rich, although dual-dust chemistry objects, whose infrared spectra reveal both silicate- and carbon-dust features, are also known. The exact origin and nature of this dual-dust chemistry is not yet understood. Spitzer-IRS mid-infrared spectroscopic imaging of the nearby, oxygen-rich planetary nebula NGC6720 reveals the presence of the 11.3 micron aromatic (PAH) emission band. It is attributed to emission from neutral PAHs, since no band is observed in the 7 to 8 micron range. The spatial distribution of PAHs is found to closely follow that of the warm clumpy molecular hydrogen emission. Emission from both neutral PAHs and warm H2 is likely to arise from photo-dissociation regions associated with dense knots that are located within the main ring. The presence of PAHs together with the previously derived high abundance of free carbon (relative to CO) suggest that the local conditions in an oxygen-rich environment can also become conducive to in-situ formation of large carbonaceous molecules, such as PAHs, via a bottom-up chemical pathway. In this scenario, the same stellar source can enrich the interstellar medium with both oxygen-rich dust and large carbonaceous molecules.Comment: Accepted by MNRAS. 5 page

    Characterization of heat transfer in nutrient materials, part 2

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    A thermal model is analyzed that takes into account phase changes in the nutrient material. The behavior of fluids in low gravity environments is discussed along with low gravity heat transfer. Thermal contact resistance in the Skylab food heater is analyzed. The original model is modified to include: equivalent conductance due to radiation, radial equivalent conductance, wall equivalent conductance, and equivalent heat capacity. A constant wall-temperature model is presented
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