1,036 research outputs found
Information Asymmetry, Education Signals and the Case of Ethnic and Native Germans
This paper analyses the effects of education signals for Ethnic Germans and Germans without a migration background (âNative Germansâ). We base our analysis on a sorting model with productivity enhancing effects of education. We compare whether the signalling value differs between the migrants and non-migrants in the German labour market. Starting from the theoretical result that only a separating equilibrium can exist, we find substantial empirical differences between Ethnic and Native Germans with the same formal education level. This empirical analysis is done with a completely new dataset based on administrative data from the German Federal Employment Agency.sorting theory, human-capital theory, returns to education, migration
Information asymmetry, education signals and the case of Ethnic and Native Germans
"This paper analyses the effects of education signals for Ethnic Germans and Germans without a migration background ('Native Germans'). We base our analysis on a sorting model with productivity enhancing effects of education. We compare whether the signalling value differs between the migrants and non-migrants in the German labour market. Starting from the theoretical result that only a separating equilibrium can exist, we find substantial empirical differences between Ethnic and Native Germans with the same formal education level. This empirical analysis is done with a completely new dataset based on administrative data from the German Federal Employment Agency." (Author's abstract, IAB-Doku) ((en))integrierte Erwerbsbiografien, Bildungsniveau, Bildungsabschluss, InlÀnder, Aussiedler, Hochqualifizierte, mittlere Qualifikation, Niedrigqualifizierte, Lohnhöhe, Lohnunterschied
Improving physics-informed DeepONets with hard constraints
Current physics-informed (standard or operator) neural networks still rely on
accurately learning the initial conditions of the system they are solving. In
contrast, standard numerical methods evolve such initial conditions without
needing to learn these. In this study, we propose to improve current
physics-informed deep learning strategies such that initial conditions do not
need to be learned and are represented exactly in the predicted solution.
Moreover, this method guarantees that when a DeepONet is applied multiple times
to time step a solution, the resulting function is continuous.Comment: 15 pages, 5 figures, 4 tables; release versio
Erratum: "Nucleation and growth of nickel nanoclusters on graphene Moiré on Rh(111)" [Appl. Phys. Lett. 96, 093115 (2010)an]
Direct observation of domain-wall configurations transformed by spin currents
Direct observations of current-induced domain-wall propagation by
spin-polarized scanning electron microscopy are reported. Current pulses move
head-to-head as well as tail-to-tail walls in sub-micrometer Fe_{20}Ni_{80}
wires in the direction of the electron flow, and a decay of the wall velocity
with the number of injected current pulses is observed. High-resolution images
of the domain walls reveal that the wall spin structure is transformed from a
vortex to a transverse configuration with subsequent pulse injections. The
change in spin structure is directly correlated with the decay of the velocity.Comment: 5 pages, 3 figure
How Cosmic Rays Mediate the Evolution of the Interstellar Medium
We explore the impact of diffusive cosmic rays (CRs) on the evolution of the
interstellar medium (ISM) under varying assumptions of supernova explosion
environment. In practice, we systematically vary the relative fractions of
supernovae (SN) occurring in star-forming high-density gas and those occurring
in random locations decoupled from star-forming gas to account for SN from
run-away stars or explosions in regions that have been cleared by prior SN,
stellar winds, or radiation. We explore various mixed models by adjusting these
fractions relative to each other. We find that in the simple system of a
periodic stratified gas layer the ISM structure will evolve to one of two
solutions: a "peak driving" state where warm gas is volume filling or a
"thermal runaway" state where hot gas is volume filling. CR pressure and
transport are important factors that strongly influence the solution state the
ISM reaches and have the ability to flip the ISM between solutions. Observable
signatures such as gamma ray emission and HI gas are explored. We find that
gamma ray luminosity from pion decay is largely consistent with observations
for a range of model parameters. The thickness of the HI gas layer may be too
compact, however, this may be due to a large cold neutral fraction of midplane
gas. The volume fraction of hot gas evolves to stable states in both solutions,
but neither settles to a Milky Way-like configuration, suggesting that
additional physics which is omitted here (e.g. a cosmological circum-galactic
medium, radiation transport, or spectrally resolved and spatially varying CR
transport) may be required.Comment: 27 pages, 21 Figures, submitted to MNRAS, comments welcom
How cosmic rays mediate the evolution of the interstellar medium
Funding: CP acknowledges support by the European Research Council under ERC-CoG grant CRAGSMAN-646955.We explore the impact of diffusive cosmic rays (CRs) on the evolution of the interstellar medium (ISM) under varying assumptions of supernova explosion environment. In practice, we systematically vary the relative fractions of supernovae (SN) occurring in star-forming high-density gas and those occurring in random locations decoupled from star-forming gas to account for SN from run-away stars or explosions in regions that have been cleared by prior SN, stellar winds, or radiation. We find that in the simple system of a periodic stratified gas layer the ISM structure will evolve to one of two solutions: a âpeak drivingâ state where warm gas is volume filling or a âthermal runawayâ state where hot gas is volume filling. CR pressure and transport are important factors that strongly influence the solution state the ISM reaches and have the ability to flip the ISM between solutions. Observable signatures such as gamma-ray emission and HâI gas are explored. We find that gamma-ray luminosity from pion decay is largely consistent with observations for a range of model parameters. The thickness of the HâI gas layer may be too compact, however, this may be due to a large cold neutral fraction of mid-plane gas. The volume fraction of hot gas evolves to stable states in both solutions, but neither settles to a Milky Way-like configuration, suggesting that additional physics omitted here (e.g. a cosmological circumgalactic medium, radiation transport, or spectrally resolved and spatially varying CR transport) may be required.Peer reviewe
World Ocean Review 2013 : Living with the ocean : 2. The Future of Fish - The Fisheries of the Future
Superconducting microstrip detectors
Superconducting NbN microstrip counters feature radiation hardness two orders of magnitude higher than conventional Si strip detectors, spatial resolution limited only by lithographic techniques (0.1 - 2 microns), intrinsic signal rise time of 2 ps, and signal transport over large distances without losses. The aim of this proposal is to improve understanding of the physics of such detectors and to establish their large- scale feasibility
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