777 research outputs found
Labor Market I. Data from the German Federal Employment Services
This contribution shows the increasing supply on German micro data over the last years for labor market research. We focus on the research data centre movement, the development of new anonymisation techniques for establishment data, the new challenges of the social code II and the fundamental change to evaluate labor market programmes actively with administrative data. Although a lot of ongoing developments like combining different data sets are happening, we make three recommendations for future developments in this area: (1) Demand to have an influence an the data production. (2) The need to combine data sets (especially across national borders) (3) Importance to establish an international infrastructure for data access.labor market, data access, administrative data, linked employer employee data, research data center, social code II, evaluation
Rifting in the northern Tyrrhenian Sea Basin: a multichannel and wide-angle seismic study
Rifted continental margins or basins are the results of continental lithospheric extension
and a fundamental process in geodynamics. Extension is expressed by normal faulting
and block rotation in the brittle upper crust and ductile deformation in the lower
crust. Conjugate rifted margins are often asymmetric and reveal different amounts of
crustal stretching and thinning. Shallow dipping crustal-scale detachment faults are
thought to be the controlling mechanism of this asymmetry, although the development
of such features is debated. This PhD thesis presents the results of a seismic campaign
from the northern Tyrrhenian Sea Basin. It is a continental back-arc basin exhibiting
rift features preserved at the early stages of rifting. Two W-E orientated multichannel
seismic profiles (MCS) cross the region between Corsica, Sardinia and mainland Italy.
The data are processed up to prestack-depth and time migrated images in order to
investigate the style of faulting and sedimentary structures. Coincident refraction- and
wide-angle seismic data were acquired using OBH-stations. Joint refraction and reflection
tomography reveal the crustal architecture and thickness.
The MCS image of the northern profile shows that the geometry of upper Tortonian to
Early-Pliocene sediments (8-4 Ma) reflects the active rift phase. Fault displacements
are localized on major normal faults dipping mainly to the east (30°-40°) forming a
succession of asymmetric half-grabens. Major blocks generate the majority of the entire
horizontal extension which is estimated to be ~30%. Faults seem not to be linked
at the brittle-ductile transition zone (~3-4 km). The tomographic model shows, that
the crust has thinned from ~24 km to a thickness of ~17 km (ß=1.3). The thinning
matches the estimated amount of horizontal extension (30%).
Towards the southern transect, the width of the basin increases. Seismic data display
an asymmetric margin configuration. This is expressed by crustal thinning from ~24
km in the west (Sardinia) to ~11 km in the east (ß-factor=2.2). Moreover, the Sardinia
Margin comprises large fault-bounded blocks where the crust is relatively thick. Blocks
of smaller size are observed further east, where the crust has thinned more. This zone
(~ 100 km wide) is characterized by reduced p-wave velocities which correlates with
intensive faulting as imaged on the MCS section. A reliable estimation of the amount
of brittle extension is not possible due to the presence of complex small-scale faults.
However, the thinning-factor of the lower crust matches the thinning-factor of the entire
crust. This implies that the amount of brittle extension should be similar. In this zone,
reflections within sedimentary sub-basins are related to basalt flows. A narrow zone
with similar characteristics is also observed on the northern line.
In the vicinity of the Sardinia Margin, post-rift sediments indicate that tectonism has
ceased before Early-Pliocene time, whereas young faults cut the seafloor in the center
and in the eastern region (near mainland Italy). The different ages of syn-tectonic sequences
indicate an apparent W-E rift propagation. The comparison of both transects
shows a NW-SE orientated crustal thinning resulting in mantle exhumation in the Vavilov
Basin. Diminishing block sizes and concomitant crustal thinning reflect increasing
strain rates in NW-SE direction.
The data provide no evidence for potential long-lived detachment faults controlling the
development of the asymmetric rift configuration. However, it can be explained by the
regional plate-tectonic setting and subduction roll-back. Rifting propagated toward the
east, following the retreatment of the subduction zone. The pole of rotation is located
north of the basin. Thus, with increasing distance from the pole toward the south,
stretching rates increase. This led to the differences of syn-sedimentary ages, block
sizes and NW-SE crustal thinning
Automatic Analysis of Lens Distortions in Image Registration
Geometric image registration by estimating homographies is an important processing step in a wide variety of computer vision applications. The 2D registration of two images does not require an explicit reconstruction of intrinsic or extrinsic camera parameters. However, correcting images for non-linear lens distortions is highly recommended. Unfortunately, standard calibration techniques are sometimes difficult to apply and reliable estimations of lens distortions can only rarely be obtained. In this paper we present a new technique for automatically detecting and categorising lens distortions in pairs of images by analysing registration results. The approach is based on a new metric for registration quality assessment and facilitates a PCA-based statistical model for classifying distortion effects. In doing so the overall importance for lens calibration and image corrections can be checked, and a measure for the efficiency of accordant correction steps is given
Labor market I: data from the German Federal Employment Services
"This contribution shows the increasing supply on German micro data over the last years for labor market research. We focus on the research data centre movement, the development of new anonymisation techniques for establishment data, the new challenges of the social code II and the fundamental change to evaluate labor market programmes actively with administrative data. Although a lot of ongoing developments like combining different data sets are happening, we make three recommendations for future developments in this area: (1) Demand to have an influence an the data production. (2) The need to combine data sets (especially across national borders). (3) Importance to establish an international infrastructure for data access." [author's abstract
Decreasing excitation gap in Andreev billiards by disorder scattering
We investigate the distribution of the lowest-lying energy states in a
disordered Andreev billiard by solving the Bogoliubov-de Gennes equation
numerically. Contrary to conventional predictions we find a decrease rather
than an increase of the excitation gap relative to its clean ballistic limit.
We relate this finding to the eigenvalue spectrum of the Wigner-Smith time
delay matrix between successive Andreev reflections. We show that the longest
rather than the mean time delay determines the size of the excitation gap. With
increasing disorder strength the values of the longest delay times increase,
thereby, in turn, reducing the excitation gap.Comment: 6 pages, 5 figures, submitted to EP
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