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  • 1
    Electronic Resource
    Electronic Resource
    Electron Spin Resonance Study of Thermal Effects in Irradiated Deoxyribonucleic Acid (1966)
    [s.l.] : Nature Publishing Group
    Nature 210 (1966), S. 526-527 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] A dry specimen of DNA, extracted from salmon sperm and given to us by the Department of Biophysics, King's College, London, was irradiated at 77 K to a dose of 1 Mrad with cobalt-60 y-rays in an evacuated 'Spectrosil' sample tube. The derivative spectrum shown in Fig. 1 was recorded at 77 K on an ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/210526a0
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Momentum creation by vortices in superfluid 3 He as a model of primordial baryogenesis (1997)
    [s.l.] : Nature Publishing Group
    Nature 386 (1997), S. 689-692 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] To explain the creation of matter in the early Universe we begin by recalling the relationship E2 = mc4 + p2(? between energy E and momentum p for relativistic particles with rest mass m0 (c is the velocity of light). Dirac realized that the square root of this equation, E= ± (m20c4 +pV)i ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/386689a0
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  • 3
    Electronic Resource
    Electronic Resource
    Vortex Mutual Friction in Superfluid 3He (1997)
    Springer
    Journal of low temperature physics 109 (1997), S. 423-459 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We give a full account of our extensive measurements of vortex mutual friction in rotating superfluid 3He, in both the A- and B-phases. The B-phase results are in qualitative agreement with a theory based on the concept of “spectral flow”; the agreement becomes quantitative if an effective energy gap of 0.63 Δ is used, but the Justification for such a substitution is not clear. The vortex core transition, at first not seen because of metastability and hysteresis, has now been observed. Detailed investigation suggests that the high temperature vortex state is a temperature dependent mixture of at least two vortex types. The A-phase mutual friction is found to be well described by two hydrodynamic coefficients, the orbital viscosity and the orbital inertia. The latter corresponds to an orbital angular momentum per Cooper pair of (0.0015 ± 0.0017 ) ħ, consistent with the prediction of the spectral flow theory. We find that the most uniform l texture is obtained by cooling through Tc while rotating, and then stopping rotation. Detailed investigation of textural memory effects shows that the uniform l-up and l-down textures are associated with opposite directions of rotation. We discuss the various types of texture that may be formed in our experiments. Finally, we compare our mutual friction results with those found in 4HeII.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s10909-005-0095-z
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Vortex mutual friction in superfluid3He (1997)
    Springer
    Journal of low temperature physics 109 (1997), S. 423-459 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We give a full account of our extensive measurements of vortex mutual friction in rotating superfluid3He, in both the A- and B-phases. The B-phase results are in qualitative agreement with a theory based on the concept of “spectral flow”; the agreement becomes quantitative if an effective energy gap of 0.63Δ is used, but the justification for such a subtitution is not clear. The vortex core transition, at first not seen because of metastability and hysteresis, has now been observed. Detailed investigation suggests that the high temperature vortex state is a temperature dependent mixture of least two vortex types. The A-phase mutual friction is found to be well described by two hydrodynamic coefficients, the orbital viscosity and the orbital inertia. The latter corresponds to an orbital angular momentum per Cooper pair of (0.0015±0.0017) h, consistent with the prediction of the spectral flow theory. We find that the most uniforml texture is obtained by cooling through Tc while rotating, and then stopping rotation. Detailed investigation of textural memory effects shows that the uniforml-up andl-down textures are associated with opposite directions of rotation. We discuss the various types of texture that may be formed in our experiments. Finally, we compare our mutual friction results with those found in4Hell.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02396905
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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