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12. INSCRIBING A NEW SPACE. WRITTEN EXPRESSIONS OF UTOPIA AND RESISTANCE DURING THE GEZI PARK PROTESTS IN ISTANBULGiustina Selvelli, 2016, izvirni znanstveni članek Opis: In this paper I consider examples of urban public inscriptions which appeared during the Gezi Park protests of Istanbul in 2013. I consider them both as a form of expression permitting the creation and circulation of utopian messages of resistance, and as relating to the inclusion of a multiplicity of identities in the protest arena, such as Kurdish, Armenian and LGBT identities. I insist on the role the written word plays in forging a specific and non-exclusivist imaginary of the protest, positioned within complex
power dynamics and national narratives. I view the physical presence of specific graphic expressions referencing “marginal identities” as part of a set of revolutionary actions, which demonstrate the importance of written-in spaces and surfaces in processes of “symbolic reterritorialization”. This theme
emerges as one of the central questions in interpretations of events relating to the Gezi resistance.
Ključne besede: public inscriptions, reappropriation of space, protest, Gezi Park, minorities
Objavljeno v RUNG: 22.06.2020; Ogledov: 2307; Prenosov: 0
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13. Space weather research with the Pierre Auger ObservatoryMiha Živec, 2019, magistrsko delo Opis: Space weather refers to environmental conditions in the interplanetary space and Earth’s
magnetosphere, ionosphere and exosphere and can influence the performance and reliability
of electronics based technological systems. The major role in space weather
changes plays the solar wind, a stream of charged particles (mostly electrons and protons)
with energies of approximately 1 keV, that can cause geomagnetic storms and auroras.
During their entry into the atmosphere, high energy cosmic rays collide with atomic
nuclei of atmospheric gasses. When scattering occurs extensive air showers are created.
Those cascades of secondary particles create flashes of light due to the Cherenkov
effect as well as excite molecules of nitrogen gas in atmosphere, which then glow in
fluorescent light. In order to observe the light created by air showers, it has to be
collected with telescopes. The particles from the cascades that reach ground can be
detected with surface detectors. The Pierre Auger Observatory is the largest observatory
for cosmic ray measurements. It is located in Argentinian pampas covering an area of
3000 km2. It consists of 1660 surface detectors and 27 fluorescence telescopes. For
cosmic rays with energies above few 1017 eV, a precise reconstruction of energy and
direction of primary particle is achievable. Observatory also allows measurement of
flux of incoming particles down to primary energies in ca. 10 GeV - 10 TeV interval, with a median energy ca. 80-90 GeV. This measurement capability is called "scaler"
mode, since the corresponding data consist of scaler counted cascade particles with
deposited energy between 15 and 100 MeV, at the average rate of 2 kHz per individual
surface detector.
For the purpose of this master thesis I compared the data from scaler mode measurements
with measurements of neutron monitors, which are commonly used for space weather
observations. With the correlation received from the comparison, I showed that scaler
mode operation of Pierre Auger observatory can be used to monitor space weather events
such as solar cycle and the decreases in the observed galactic cosmic ray intensity due
to solar wind (Forbush decrease).
Ključne besede: Pierre Auger Observatory, cosmic rays, space weather, Forbush decrease
Objavljeno v RUNG: 17.09.2019; Ogledov: 4966; Prenosov: 181
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18. eastweetswest : :::::::: a performance process reflecting the state of unityPeter Purg, 2016, umetniško delo Opis: "After more than a quarter century thoughts and actions were shared, reflecting the state of unity.
Ključne besede: " The Twitter account of grüntaler9 invited everyone to tweet/comment upon the topic of East & West. The performer arranged selected feeds, printed out on paper and cut to tile size onto the Black & White floor tiles of the space.
Performative (re)actions emerged by performer and participants, online and on site, critical or speculative, mythical or manipulative... Live feeds were used primarily, recycling material was an option. Text was used primarily, pictures are an option.
After more than a quarter century thoughts and actions were shared, reflecting the state of unity."
Live Performance 12 – 14h at grüntaler9, berlin, Germany
Tweets and responses @ :://twitter.com/Gruentaler9
Objavljeno v RUNG: 16.11.2016; Ogledov: 6733; Prenosov: 0 |
19. Horizon Shells and BMS-like soldering transformationsMatthias Blau, Martin O'Loughlin, 2016, izvirni znanstveni članek Opis: We revisit the theory of null shells in general relativity, with a particular
emphasis on null shells placed at horizons of black holes. We study in detail the considerable
freedom that is available in the case that one solders two metrics together across null
hypersurfaces (such as Killing horizons) for which the induced metric is invariant under
translations along the null generators. In this case the group of soldering transformations
turns out to be infinite dimensional, and these solderings create non-trivial horizon shells
containing both massless matter and impulsive gravitational wave components. We also
rephrase this result in the language of Carrollian symmetry groups. To illustrate this
phenomenon we discuss in detail the example of shells on the horizon of the Schwarzschild
black hole (with equal interior and exterior mass), uncovering a rich classical structure
at the horizon and deriving an explicit expression for the general horizon shell energy-
momentum tensor. In the special case of BMS-like soldering supertranslations we find a
conserved shell-energy that is strikingly similar to the standard expression for asymptotic
BMS supertranslation charges, suggesting a direct relation between the physical properties
of these horizon shells and the recently proposed BMS supertranslation hair of a black hole.
Ključne besede: Black Holes, Classical Theories of Gravity, Space-Time Symmetries
Objavljeno v RUNG: 10.03.2016; Ogledov: 4663; Prenosov: 0
Gradivo ima več datotek! Več... |
