74 research outputs found
Análise da aptidão física, da antropometria e da prevalência de sintomas osteomusculares na categoria infanto-juvenil do voleibol
A Global Fireball Observatory
The world's meteorite collections contain a very rich picture of what the
early Solar System would have been made of, however the lack of spatial context
with respect to their parent population for these samples is an issue. The
asteroid population is equally as rich in surface mineralogies, and mapping
these two populations (meteorites and asteroids) together is a major challenge
for planetary science. Directly probing asteroids achieves this at a high cost.
Observing meteorite falls and calculating their pre-atmospheric orbit on the
other hand, is a cheaper way to approach the problem. The Global Fireball
Observatory (GFO) collaboration was established in 2017 and brings together
multiple institutions (from Australia, USA, Canada, Morocco, Saudi Arabia, the
UK, and Argentina) to maximise the area for fireball observation time and
therefore meteorite recoveries. The members have a choice to operate
independently, but they can also choose to work in a fully collaborative manner
with other GFO partners. This efficient approach leverages the experience
gained from the Desert Fireball Network (DFN) pathfinder project in Australia.
The state-of-the art technology (DFN camera systems and data reduction) and
experience of the support teams is shared between all partners, freeing up time
for science investigations and meteorite searching. With all networks combined
together, the GFO collaboration already covers 0.6% of the Earth's surface for
meteorite recovery as of mid-2019, and aims to reach 2% in the early 2020s. We
estimate that after 5 years of operation, the GFO will have observed a fireball
from virtually every meteorite type. This combined effort will bring new,
fresh, extra-terrestrial material to the labs, yielding new insights about the
formation of the Solar System.Comment: Accepted in PSS. 19 pages, 9 figure
Effective Rheology of Bubbles Moving in a Capillary Tube
We calculate the average volumetric flux versus pressure drop of bubbles
moving in a single capillary tube with varying diameter, finding a square-root
relation from mapping the flow equations onto that of a driven overdamped
pendulum. The calculation is based on a derivation of the equation of motion of
a bubble train from considering the capillary forces and the entropy production
associated with the viscous flow. We also calculate the configurational
probability of the positions of the bubbles.Comment: 4 pages, 1 figur
Resilience Management for Healthy Cities in a Changing Climate
Cities are experiencing multiple impacts from global environmental
change, and the degree to which they will need to cope with and adapt to these challenges
will continue to increase. We argue that a ‘complex systems and resilience
management’ view may significantly help guide future urban development through
innovative integration of, for example, grey, blue and green infrastructure embedded
in flexible institutions (both formal and informal) for multi-functionality and
improved health. For instance, the urban heat island effect will further increase city-centre
temperatures during projected more frequent and intense heat waves. The
elderly and people with chronic cardiovascular and respiratory diseases are particularly
vulnerable to heat. Integrating vegetation and especially trees in the urban
infrastructure helps reduce temperatures by shading and evapotranspiration. Great
complexity and uncertainty of urban social-ecological systems are behind this
heatwave-health
nexus, and they need to be addressed in a more comprehensive
manner. We argue that a systems perspective can lead to innovative designs of new
urban infrastructure and the redesign of existing structures. Particularly to promoting
the integration of grey, green and blue infrastructure in urban planning through
institutional innovation and structural reorganization of knowledge-action systems
may significantly enhance prospects for improved urban health and greater resilience
under various scenarios of climate change.info:eu-repo/semantics/publishedVersio
Health and climate related ecosystem services provided by street trees in the urban environment
Alignment of the ALICE Inner Tracking System with cosmic-ray tracks
37 pages, 15 figures, revised version, accepted by JINSTALICE (A Large Ion Collider Experiment) is the LHC (Large Hadron Collider) experiment devoted to investigating the strongly interacting matter created in nucleus-nucleus collisions at the LHC energies. The ALICE ITS, Inner Tracking System, consists of six cylindrical layers of silicon detectors with three different technologies; in the outward direction: two layers of pixel detectors, two layers each of drift, and strip detectors. The number of parameters to be determined in the spatial alignment of the 2198 sensor modules of the ITS is about 13,000. The target alignment precision is well below 10 micron in some cases (pixels). The sources of alignment information include survey measurements, and the reconstructed tracks from cosmic rays and from proton-proton collisions. The main track-based alignment method uses the Millepede global approach. An iterative local method was developed and used as well. We present the results obtained for the ITS alignment using about 10^5 charged tracks from cosmic rays that have been collected during summer 2008, with the ALICE solenoidal magnet switched off.Peer reviewe
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