Schuldencoöp: jongeren van hood naar Hoop

Global Challenges (FSW

Hints of an axion-like particle mixing in the GeV gamma-ray blazar data?

Axion-Like Particles (ALPs), if exist in nature, are expected to mix with photons in the presence of an external magnetic field. The energy range of photons which undergo strong mixing with ALPs depends on the ALP mass, on its coupling with photons as well as on the external magnetic field and particle density configurations. Recent observations of blazars by the Fermi Gamma-Ray Space Telescope in the 0.1-300 GeV energy range show a break in their spectra in the 1-10 GeV range. We have modeled this spectral feature for the flat-spectrum radio quasar 3C454.3 during its November 2010 outburst, assuming that a significant fraction of the gamma rays convert to ALPs in the large scale jet of this blazar. Using theoretically motivated models for the magnetic field and particle density con figurations in the kiloparsec scale jet, outside the broad-line region, we find an ALP mass m(a) similar to (1 ¿ 3).10(-7) eV and coupling g(a gamma) similar to (1 ¿ 3).10(-10) GeV-1 after performing an illustrative statistical analysis of spectral data in four different epochs of emission. The precise values of m(a) and g(a gamma) depend weakly on the assumed particle density con figuration and are consistent with the current experimental bounds on these quantities. We apply this method and ALP parameters found from fitting 3C454.3 data to another flat-spectrum radio quasar PKS1222+216 (4C+21.35) data up to 400 GeV, as a consistency check, and found good fit. We find that the ALP-photon mixing effect on the GeV spectra may not be washed out for any reasonable estimate of the magnetic field in the intergalactic media

Just compensation? The price of death and injury after the Rana Plaza garment factory collapse

The 2013 collapse of the Rana Plaza factory building in Dhaka, Bangladesh was the most deadly disaster in garment manufacturing history, with at least 1,134 people killed and hundreds injured. In 2015, injured workers and the families of those killed received compensation from global apparel brands through a $30 million voluntary initiative known as the Rana Plaza Arrangement. Overseen by the International Labour Organization (ILO), the Rana Plaza Arrangement awarded payments to survivors using a pricing formula developed by a diverse team of ‘stakeholders’ that included labour groups, multinational apparel companies, representatives of the Bangladesh government and local employers, and ILO actuaries. This article draws from anthropological scholarship on the ‘just price’ to explore how a formula for pricing death and injury became both the means and form of a fragile political settlement in the wake of a shocking and widely publicised industrial disaster. By unpacking the complicated ‘ethics of a formula’ (Ballestero 2015), I demonstrate how the project of creating a just price involves not two sets of values (ethical and financial) but rather multiple, competing values. This article argues for recognition of the persistence and power of these competing values, showing how they variously strengthen and undermine the claim that justice was served by the Rana Plaza Arrangement. This analysis reveals the deficiencies of counterposing ‘morality’ and ‘economy’ in the study of price by reflecting upon all elements of price as situated within political economy and history

Messprozessor für Rekonfigurationsabläufe und Übertragungsströme im Echtzeitrechnersystem mit verteilten Mikroprozessoren (RDC-System)

Der Beitrag beschreibt den Aufbau und Einsatz eines Messprozessors in einem busgekoppelten System, und zwar im Zuge der Pilotanwendung des fehlertoleranten, lichtleitergekoppelten Echtzeitrechnersystems mit verteilten Mikrocomputerstationen (RDC-System). Der Messprozessor hat dabei Aufgabe, Nachrichtenströme zu beobachten und relevante Ereignisse für eine spätere Analyse aufzuzeichnen. Ein wesentliches Ziel ist die Untersuchung der Wirksamkeit von Maßnahmen zur Fehlertoleranz

Rechnergestuetzter Entwurf von Rechnersystemen.

Economic growth and industrial competiveness rely heavily on the use of data processing and automation, resulting in increasingly complex requirements being placed on computer systems of all sizes. The need to fulfill these requirements and the availability of new technology have led to a new product class: modular computer systems, each module realized on one board. These make the design of computer systems for individual applications possible. Fault tolerant multi-micro-processor systems, which can now be farreachingly projected, require for their design a quantitative and complete description. This can be achieved by considering the three models, queueing model, reliability net and diagnostic graph based on the set of hardware and software modules of the system. In this paper the parameters of the three models will be represented with aid of a relational data model, which serves as a basis for analytical and simulation procedures to obtain the characteristic indices of the system. T he performance characteristics in various reconfiguration states will be determined for the example of a special application of the fault tolerant real time computer system RDC with consideration of the relational data model. (IITB