828 research outputs found
Petersburger Erklärung: Anstöße für eine zukunftsgerichtete Arbeitsmarktpolitik
Anläßlich eines Symposiums, veranstaltet vom neu gegründeten Forschungsinstitut zur Zukunft der Arbeit (IZA) in Bonn, legten sechs Ökonomen in einer „Petersberger Erklärung' Thesen zur Arbeitsmarktpolitik vor. Nachfolgend der Wortlaut der Erklärung --
The 0.1-200 keV spectrum of the blazar PKS 2005-489 during an active state
The bright BL Lac object PKS 2005-489 was observed by BeppoSAX on November
1-2, 1998, following an active X-ray state detected by RossiXTE. The source,
detected between 0.1 and 200 keV, was in a very high state with a continuum
well fitted by a steepening spectrum due to synchrotron emission only. Our
X-ray spectrum is the flattest ever observed for this source. The different
X-ray spectral slopes and fluxes, as measured by various satellites, are
consistent with relatively little changes of the peak frequency of the
synchrotron emission, always located below 10^{17} Hz. We discuss these results
in the framework of synchrotron self-Compton models. We found that for the
BeppoSAX observation, the synchrotron peak frequency is between 10^{15} and
2.5x10^{16} Hz, depending on the model assumptions.Comment: 7 pages, 4 figures, accepted for publication in A&
Self-consistent Green's function approaches
We present the fundamental techniques and working equations of many-body
Green's function theory for calculating ground state properties and the
spectral strength. Green's function methods closely relate to other polynomial
scaling approaches discussed in chapters 8 and 10. However, here we aim
directly at a global view of the many-fermion structure. We derive the working
equations for calculating many-body propagators, using both the Algebraic
Diagrammatic Construction technique and the self-consistent formalism at finite
temperature. Their implementation is discussed, as well as the inclusion of
three-nucleon interactions. The self-consistency feature is essential to
guarantee thermodynamic consistency. The pairing and neutron matter models
introduced in previous chapters are solved and compared with the other methods
in this book.Comment: 58 pages, 14 figures, Submitted to Lect. Notes Phys., "An advanced
course in computational nuclear physics: Bridging the scales from quarks to
neutron stars", M. Hjorth-Jensen, M. P. Lombardo, U. van Kolck, Editor
Electric dipole polarizability of Ca
The electric dipole strength distribution in Ca between 5 and 25 MeV
has been determined at RCNP, Osaka, from proton inelastic scattering
experiments at very forward angles. Combined with total photoabsorption data at
higher excitation energy, this enables an extraction of the electric dipole
polarizability (Ca) = 1.92(17) fm. Together with
the measured in Ca, it provides a stringent test of
modern theoretical approaches, including coupled cluster calculations with
chiral effective field theory interactions and state-of-the art energy density
functionals. The emerging picture is that for this medium-mass region dipole
polarizabilities are well described theoretically, with important constraints
for the neutron skin in Ca and related equation of state quantities.Comment: 6 pages, 3 figure
Petersberger Erklärung
Vor dem Hintergrund der weltweiten Finanzmarkt- und Wirtschaftskrise fordern prominente Ökonomen zum Kurshalten in der deutschen Wirtschafts- und Arbeitsmarktpolitik auf. Die Experten legen einen Katalog mit Handlungsempfehlungen vor, der unter anderem die Korrektur falscher Erwerbsanreize durch das Workfare-Prinzip von Leistung und Gegenleistung im Sozialstaat vorsieht, den Ausbau von Einrichtungen zur Förderung von frühkindlicher Bildung verlangt und zu lebenslangem Lernen aufruft. Zugleich schlägt das Papier vor, die Tätigkeit in sozialen Diensten systematisch marktfähig zu machen und auf diese Weise Arbeitsmarktpotenziale zu erschließen. Zu den weiteren Forderungen der Ökonomen zählen die verstärkte Ausrichtung von Zuwanderung und Integration an den wirtschaftlichen Interessen Deutschlands, die Trennung von Umverteilung und Sozialversicherung im Steuer- und Transfersystem sowie die Schaffung von Anreizen zur Risikoübernahme innerhalb des wohlfahrtsstaatlichen Gefüges.Arbeitsmarkt, Zuwanderungsgesetz, Bildungspolitik, Workfare, Transfersystem
The relationship between sensory sensitivity and autistic traits in the general population.
Individuals with Autism Spectrum Disorders (ASDs) tend to have sensory processing difficulties (Baranek et al. in J Child Psychol Psychiatry 47:591–601, 2006). These difficulties include over- and under-responsiveness to sensory stimuli, and problems modulating sensory input (Ben-Sasson et al. in J Autism Dev Disorders 39:1–11, 2009). As those with ASD exist at the extreme end of a continuum of autistic traits that is also evident in the general population, we investigated the link between ASD and sensory sensitivity in the general population by administering two questionnaires online to 212 adult participants. Results showed a highly significant positive correlation (r = .775, p < .001) between number of autistic traits and the frequency of sensory processing problems. These data suggest a strong link between sensory processing and autistic traits in the general population, which in turn potentially implicates sensory processing problems in social interaction difficulties
Quasiparticle Hall Transport of d-wave Superconductors in Vortex State
We present a theory of quasiparticle Hall transport in strongly type-II
superconductors within their vortex state. We establish the existence of
integer quantum spin Hall effect in clean unconventional
superconductors in the vortex state from a general analysis of the
Bogoliubov-de Gennes equation. The spin Hall conductivity is
shown to be quantized in units of . This result does not
rest on linearization of the BdG equations around Dirac nodes and therefore
includes inter-nodal physics in its entirety. In addition, this result holds
for a generic inversion-symmetric lattice of vortices as long as the magnetic
field satisfies . We then derive the
Wiedemann-Franz law for the spin and thermal Hall conductivity in the vortex
state. In the limit of , the thermal Hall conductivity satisfies
. The
transitions between different quantized values of as well as
relation to conventional superconductors are discussed.Comment: 18 pages REVTex, 3 figures, references adde
How Ordinary Elimination Became Gaussian Elimination
Newton, in notes that he would rather not have seen published, described a
process for solving simultaneous equations that later authors applied
specifically to linear equations. This method that Euler did not recommend,
that Legendre called "ordinary," and that Gauss called "common" - is now named
after Gauss: "Gaussian" elimination. Gauss's name became associated with
elimination through the adoption, by professional computers, of a specialized
notation that Gauss devised for his own least squares calculations. The
notation allowed elimination to be viewed as a sequence of arithmetic
operations that were repeatedly optimized for hand computing and eventually
were described by matrices.Comment: 56 pages, 21 figures, 1 tabl
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