2,149 research outputs found

    Do labor market policies affect employment composition? Lessons from European countries

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    We study the effects of different labor market policies on employment composition in a matching model with salaried work and self-employment. We empirically assess some of the model’s predictions using micro data from the European Union Household Panel. Policies such as employment protection legislation and compulsory social security contributions of the self-employed, and their interactions, are relevant to explain the composition of employment in the European labor market. One major policy implication of this result is the need for a convenient policy mix definition.

    Wave propagation and shock formation in different magnetic structures

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    Velocity oscillations "measured" simultaneously at the photosphere and the chromosphere -from time series of spectropolarimetric data in the 10830 A region- of different solar magnetic features allow us to study the properties of wave propagation as a function of the magnetic flux of the structure (i.e. two different-sized sunspots, a tiny pore and a facular region). While photospheric oscillations have similar characteristics everywhere, oscillations measured at chromospheric heights show different amplitudes, frequencies and stages of shock development depending on the observed magnetic feature. The analysis of the power and the phase spectra, together with simple theoretical modeling, lead to a series of results concerning wave propagation within the range of heights of this study. We find that, while the atmospheric cut-off frequency and the propagation properties of the different oscillating modes depend on the magnetic feature, in all the cases the power that reaches the high chromosphere above the atmospheric cut-off comes directly from the photosphere by means of linear vertical wave propagation rather than from non-linear interaction of modes.Comment: Accepted for publication in The Astrophysical Journal. 29 pages, 9 figures, 12pt, preprin

    Keep It Up: The Things Within and Without

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    My art explores my attraction and repulsion to a commodity driven society. Paint Thing and Saint Thing are characters that I created to push my boundaries as a painter and question my process within painting. Working through my agitation, feeling of loss and confusion, I find that two parts need to be present: a belief in the process and the fear of it coming undone. I use painting, sculpture and video to question the materiality of canvas and paint. I incorporate plastic objects, glittery materials, and things that have ephemeral qualities. I am attracted to synthetic forms and objects when arranging them in my compositions. In my work I look closely at the social constructs and systems that bind us to the commodity driven market. I feel if we are to understand our current conditions, we must also include the impact and importance of things in our material world

    The Hanle and Zeeman Effects in Solar Spicules: A Novel Diagnostic Window on Chromospheric Magnetism

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    An attractive diagnostic tool for investigating the magnetism of the solar chromosphere is the observation and theoretical modeling of the Hanle and Zeeman effects in spicules, as shown in this letter for the first time. Here we report on spectropolarimetric observations of solar chromospheric spicules in the He I 10830 \AA multiplet and on their theoretical modeling accounting for radiative transfer effects. We find that the magnetic field in the observed (quiet Sun) spicular material at a height of about 2000 km above the visible solar surface has a strength of the order of 10 G and is inclined by approximately 3535^{\circ} with respect to the local vertical direction. Our empirical finding based on full Stokes-vector spectropolarimetry should be taken into account in future magnetohydrodynamical simulations of spicules.Comment: 12 pages and 2 figure