6 research outputs found
Integrated Approach to a Resilient City: Associating Social, Environmental and Infrastructure Resilience in its Whole
Rising complexity, numbers and severity of natural and manmade disasters enhance the importance of reducing vulnerability, or on contrary â increasing resilience, of different kind of systems, including those of social, engineering (infrastructure), and environmental (ecological) nature. The goal of this research is to explore urban resilience as an integral system of social, environmental, and engineering resilience. This report analyses the concepts of each kind of resilience and identifies key factors influencing social, ecological, and infrastructure resilience discussing how these factors relate within urban systems. The achievement of resilience of urban and regional systems happens through the interaction of the different elements (social, psychological, physical, structural, and environmental, etc.); therefore, resilient city could be determined by synergy of resilient society, resilient infrastructure and resilient environment of the given area.
Based on literature analysis, the current research provides some insights on conceptual framework for assessment of complex urban systems in terms of resilience. To be able to evaluate resilience and define effective measures for prevention and risk mitigation, and thereby strengthen resilience, we propose to develop an e-platform, joining risk parametersâ Monitoring Systems, which feed with data Resiliency Index calculation domain. Both these elements result in Multirisk Platform, which could serve for awareness and shared decision making for resilient people in resilient city
Detection of a radio-filled X-ray cavity within the interstellar medium of NGC 5141
We present the first Chandra detection of a single X-ray cavity within the
interstellar medium of the small Fanaroff-Riley type I (FRI) radio galaxy NGC
5141. The X-ray surface brightness depression, located kpc away
from the galaxy center, is projected on the northern radio lobe, which is
completely contained within the galaxy. The thermal gas surrounding the cavity,
which extends to 20 kpc, has a bolometric X-ray luminosity (0.1 - 100
keV) of L erg s and a temperature of
keV. We calculated the total energy (E erg) required to inflate the cavity and its age (
Myrs), assuming that it is filled with relativistic particles and rises
buoyantly. The inferred total cavity power is as low as
P erg s, which is the
lowest one among the radio-filled systems. Comparing to the
bolometric X-ray luminosity (i.e., the cooling luminosity), we conclude that
NGC 5141's central active galactic nucleus can heat the interstellar medium and
balance its cooling luminosity, confirming that the
relation, mainly tested on groups and clusters, also works for such a low-power
system.Comment: 9 pages, 6 figures, accepted for publication in A&A on 28 January
202