1,425 research outputs found

    A Possible Origin of Magnetic Fields in Galaxies and Clusters: Strong Magnetic fields at z~10?

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    We propose that strong magnetic fields should be generated at shock waves associated with formation of galaxies or clusters of galaxies by the Weibel instability, an instability in collisionless plasmas. The strength of the magnetic fields generated through this mechanism is close to the order of those observed in galaxies or clusters of galaxies at present. If the generated fields do not decay rapidly, this indicates that strong amplification of magnetic fields after formation of galaxies or clusters of galaxies is not required. This mechanism could have worked even at a redshift of ~10, and therefore the generated magnetic fields may have affected the formation of stars in protogalaxies. This model will partially be confirmed by future observations of nearby clusters of galaxies. Mechanisms that preserve the magnetic fields for a long time without considerable decay are discussed.Comment: Accepted for publication in MNRA

    Complement Activation Product and Cytokine in Pachychoroid Neovasculopathy and Neovascular Age-Related Macular Degeneration

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    博士(医学)福島県立医科大

    Some Properties of 30KW-Class Electron Beam for Welding

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    National Culture and the Preference for Management Controls: An exploratory Study of the Firm- Labor Market Interface

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    Abstract This study uses Hofstede's taxonomy of work-related national cultural dimensions to analyze preferences for specific management controls at the interface between the organization and the external labor market. Four experiments were conducted with samples of last-semester Japanese and U.S. MBA students. Most of the results did not provide support for the four hypotheses. These findings used as the basis for suggesting potential directions for future empirical refinements and theory construction

    Effects of the Zero-Mode Landau Level on Inter-Layer Magnetoresistance in Multilayer Massless Dirac Fermion Systems

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    We report on the experimental results of interlayer magnetoresistance in multilayer massless Dirac fermion system α\alpha-(BEDT-TTF)2_2I3_3 under hydrostatic pressure and its interpretation. We succeeded in detecting the zero-mode Landau level (n=0 Landau level) that is epected to appear at the contact points of Dirac cones in the magnetic field normal to the two-dimensional plane. The characteristic feature of zero-mode Landau carriers including the Zeeman effect is clearly seen in the interlayer magnetoresistance.Comment: 2 pages, 2 figure
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