2,094 research outputs found
Chronology and Demography: How Many People Lived in a Mega-Site?
Since the discovery of the huge dimensions of Trypillia BIVCI mega-sites, estimations about their
population size have mainly resulted magnitudes which
are as extraordinary for European prehistory as the
dimensions of the sites themselves. A variety of population calculations is known, usually (e.g. for Taljanky
and Maidanetske) focusing on around 7500-25,000
inhabitants per site (Shmaglij, 1982; Shmaglij &
Videiko, 1987; Kruts, 1989; Ohlrau, 2015). A basic
assumption for these population estimations is the contemporaneity of the majority of houses in each megasite, which might be problematic.
Also, for the reconstruction of the overall population density in the Southern Buh and Dnipro
Interfluve, the question of the contemporaneity, or
alternatively a sequential appearance, of mega-sites is
very important. In many views, the mega-sites Nebelivka-Dobrovody-Taljanky-Maidanetske are described
as a chronological sequence of about 15,000 people,
moving after about fifty years from one site to the
next, at a distance of about 20 km (Kruts, 1989). In
other views, a contemporary existence of some of
the mega-sites is supposed (MUller et al, in print). In
such an argumentation, no less than about 30,000
people were projected as living contemporarily in
mega-sites of the Volodymyrivsko-Tomashivska
group
Scientific Highlights from Observations of Active Galactic Nuclei with the MAGIC Telescope
Since 2004, the MAGIC gamma-ray telescope has newly discovered 6 TeV blazars.
The total set of 13 MAGIC-detected active galactic nuclei includes well-studied
objects at other wavelengths like Markarian 501 and the giant radio galaxy M87,
but also the distant the flat-spectrum radio quasar 3C 279, and the newly
discovered TeV gamma-ray emitter S5 0716+71. In addition, also long-term and
multi-wavelength studies on well-known TeV blazars and systematic searches for
new TeV blazars have been carried out. Here we report selected highlights from
recent MAGIC observations of extragalactic TeV gamma-ray sources, emphasizing
the new physics insights MAGIC was able to contribute.Comment: 4 pages, 2 figures, submitted to proceedings of "4th Heidelberg
International Symposium on High Energy Gamma-Ray Astronomy 2008
Variational regularization with oversmoothing penalty term in Banach spaces
In the present work, we discuss variational regularization for ill-posed
nonlinear problems with focus on an oversmoothing penalty term. This means in
our model that the searched-for solution of the considered nonlinear operator
equation does not belong to the domain of definition of the penalty functional.
In the past years, such variational regularization has been investigated
comprehensively in Hilbert scales. Our present study tries to continue and to
extend those investigations to Banach scales. This new study includes
convergence rates results for a priori choices of the regularization parameter,
both for H\"older-type smoothness and low order-type smoothness. The necessary
tools for low order smoothness in the Banach space setting are provided
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