956 research outputs found
Curating Transient Population in Urban Dynamics System
For past several decades, research efforts in population modelling has proven
its efficacy in understanding the basic information about residential and
commercial areas, as well as for the purposes of planning, development and
improvement of the community as an eco-system. More or less, such efforts
assume static nature of population distribution, in turn limited by the current
ability to capture the dynamics of population change at a finer resolution of
space and time. Fast forward today, more and more people are becoming mobile,
traveling across borders impacting the nuts and bolts of our urban fabric.
Unfortunately, our current efforts are being surpassed by the need to capture
such transient population. It is becoming imperative to identify and define
them, as well as measure their dynamics and interconnectedness. In this work,
we intend to research urban population mobility patterns, gauge their transient
nature, and extend our knowledge of their visited locations. We plan to achieve
this by designing and developing novel methods and using VGI data that models
and characterizes transient population dynamics
Retained Intra-orbital foreign bodies : A Short Case Series
ABSTRACT Intraorbital foreign in different forms are seen quite commonly in all age groups. These objects can be classified according to their compositionas (1) metallic, such as steel; (2) non-metallic, which may be inorganic, such as glass; and (3) organic, such as wood or vegetable matter. In general, injuries caused by metal and glass are well-tolerated and, if they do not have any symptoms or signs, may be left in situ, whereas organic matter, such as wood and vegetable matter, is poorly tolerated, triggers an intense inflammatory. They require prompt and adequate management for salvaging the patients vision. This retrospective case report reviews the clinical features, appearance and management of four cases with intraorbital foreign bodies where the normal vision of the patient was retained
Retained Intra-orbital foreign bodies : A Short Case Series
ABSTRACT Intraorbital foreign in different forms are seen quite commonly in all age groups. These objects can be classified according to their compositionas (1) metallic, such as steel; (2) non-metallic, which may be inorganic, such as glass; and (3) organic, such as wood or vegetable matter. In general, injuries caused by metal and glass are well-tolerated and, if they do not have any symptoms or signs, may be left in situ, whereas organic matter, such as wood and vegetable matter, is poorly tolerated, triggers an intense inflammatory. They require prompt and adequate management for salvaging the patients vision. This retrospective case report reviews the clinical features, appearance and management of four cases with intraorbital foreign bodies where the normal vision of the patient was retained
f0(980) production in inelastic pp collisions at s = 5.02 TeV
The measurement of the production of f0(980) in inelastic pp collisions at sqrt(s) = 5.02 TeV is presented. This is the first reported measurement of inclusive f0(980) yield at LHC energies. The production is measured at midrapidity, |y| pi+pi- hadronic decay channel using the ALICE detector. The pT-differential yields are compared to those of pions, protons and ϕ mesons as well as to predictions from the HERWIG 7.2 QCD-inspired Monte Carlo event generator and calculations from a coalescence model that uses the AMPT model as an input. The ratio of the pT-integrated yield of f0(980) relative to pions is compared to measurements in e+e- and pp collisions at lower energies and predictions from statistical hadronisation models and HERWIG 7.2. A mild collision energy dependence of the f0(980) to pion production is observed in pp collisions from SPS to LHC energies. All considered models underpredict the pT-integrated 2f0(980)/(pi+ + pi-) ratio. The prediction from the canonical statistical hadronisation model assuming a zero total strangeness content of f0(980) is consistent with the data within 1.9σ and is the closest to the data. The results provide an essential reference for future measurements of the particle yield and nuclear modification in p–Pb and Pb–Pb collisions, which have been proposed to be instrumental to probe the elusive nature and quark composition of the f0(980) scalar meson
Neutral to charged kaon yield fluctuations in Pb – Pb collisions at sNN=2.76 TeV
We present the first measurement of event-by-event fluctuations in the kaon sector in Pb – Pb collisions
at √sNN = 2.76 TeV with the ALICE detector at the LHC. The robust fluctuation correlator νdyn is used
to evaluate the magnitude of fluctuations of the relative yields of neutral and charged kaons, as well as
the relative yields of charged kaons, as a function of collision centrality and selected kinematic ranges.
While the correlator νdyn[K+, K− ] exhibits a scaling approximately in inverse proportion of the charged
particle multiplicity, νdyn[K0
S , K± ] features a significant deviation from such scaling. Within uncertainties,
the value of νdyn[K0S , K± ] is independent of the selected transverse momentum interval, while it exhibits
a pseudorapidity dependence. The results are compared with HIJING, AMPT and EPOS–LHC predictions,
and are further discussed in the context of the possible production of disoriented chiral condensates in
central Pb – Pb collisions
Light (anti)nuclei production in Pb-Pb collisions at sNN=5.02 TeV
The measurement of the production of deuterons, tritons and 3 He and their antiparticles in Pb-Pb collisions
at √s NN = 5.02 TeV is presented in this article. The measurements are carried out at midrapidity (|y| <
0.5) as a function of collision centrality using the ALICE detector. The pT -integrated yields, the coalescence
parameters and the ratios to protons and antiprotons are reported and compared with nucleosynthesis models. The
comparison of these results in different collision systems at different center-of-mass collision energies reveals a
suppression of nucleus production in small systems. In the Statistical Hadronisation Model framework, this can
be explained by a small correlation volume where the baryon number is conserved, as already shown in previous
fluctuation analyses. However, a different size of the correlation volume is required to describe the proton yields
in the same data sets. The coalescence model can describe this suppression by the fact that the wave functions
of the nuclei are large and the fireball size starts to become comparable and even much smaller than the actual
nucleus at low multiplicities
Inclusive and multiplicity dependent production of electrons from heavy-flavour hadron decays in pp and p-Pb collisions
Measurements of the production of electrons from heavy-flavour hadron decays in pp collisions at root s = 13 TeV at midrapidity with the ALICE detector are presented down to a transverse momentum (p(T)) of 0.2 GeV/c and up to p(T) = 35 GeV/c, which is the largest momentum range probed for inclusive electron measurements in ALICE. In p-Pb collisions, the production cross section and the nuclear modification factor of electrons from heavy-flavour hadron decays are measured in the p(T) range 0.5 < p(T) < 26 GeV/c at root s(NN) = 8.16 TeV. The nuclear modification factor is found to be consistent with unity within the statistical and systematic uncertainties. In both collision systems, first measurements of the yields of electrons from heavy-flavour hadron decays in different multiplicity intervals normalised to the multiplicity-integrated yield (self-normalised yield) at midrapidity are reported as a function of the self-normalised charged-particle multiplicity estimated at midrapidity. The self-normalised yields in pp and p-Pb collisions grow faster than linear with the self-normalised multiplicity. A strong p(T) dependence is observed in pp collisions, where the yield of high-p(T) electrons increases faster as a function of multiplicity than the one of low-p(T) electrons. The measurement in p-Pb collisions shows no p(T) dependence within uncertainties. The self-normalised yields in pp and p-Pb collisions are compared with measurements of other heavy-flavour, light-flavour, and strange particles, and with Monte Carlo simulations
Coherent J/ψ and ψ photoproduction at midrapidity in ultra-peripheral Pb–Pb collisions at √sNN = 5.02 TeV
The coherent photoproduction of J/ψJ/ψ and ψ′ψ′ mesons was measured in ultra-peripheral Pb–Pb collisions at a center-of-mass energy sNN−−−√ = 5.02sNN = 5.02 TeV with the ALICE detector. Charmonia are detected in the central rapidity region for events where the hadronic interactions are strongly suppressed. The J/ψJ/ψ is reconstructed using the dilepton (l+l−l+l−) and proton–antiproton decay channels, while for the ψ′ψ′ the dilepton and the l+l−π+π−l+l−π+π− decay channels are studied. The analysis is based on an event sample corresponding to an integrated luminosity of about 233 μb−1μb−1. The results are compared with theoretical models for coherent J/ψJ/ψ and ψ′ψ′ photoproduction. The coherent cross section is found to be in a good agreement with models incorporating moderate nuclear gluon shadowing of about 0.64 at a Bjorken-x of around 6×10−46×10−4, such as the EPS09 parametrization, however none of the models is able to fully describe the rapidity dependence of the coherent J/ψJ/ψ cross section including ALICE measurements at forward rapidity. The ratio of ψ′ψ′ to J/ψJ/ψ coherent photoproduction cross sections was also measured and found to be consistent with the one for photoproduction off protons.publishedVersio
Production of pions, kaons, and protons as a function of the relative transverse activity classifier in pp collisions at = 13 TeV
Abstract: The production of π±, K±, and ( p )p is measured in pp collisions at √s = 13 TeV
in different topological regions of the events. Particle transverse momentum (pT) spectra are
measured in the “toward”, “transverse”, and “away” angular regions defined with respect
to the direction of the leading particle in the event. While the toward and away regions
contain the fragmentation products of the near-side and away-side jets, respectively, the
transverse region is dominated by particles from the Underlying Event (UE). The relative
transverse activity classifier, RT = NT/〈NT〉, is used to group events according to their UE
activity, where NT is the measured charged-particle multiplicity per event in the transverse
region and 〈NT〉 is the mean value over all the analysed events. The first measurements
of identified particle pT spectra as a function of RT in the three topological regions are
reported. It is found that the yield of high transverse momentum particles relative to the
RT-integrated measurement decreases with increasing RT in both the toward and the away
regions, indicating that the softer UE dominates particle production as RT increases and
validating that RT can be used to control the magnitude of the UE. Conversely, the spectral
shapes in the transverse region harden significantly with increasing RT. This hardening
follows a mass ordering, being more significant for heavier particles. Finally, it is observed
that the pT-differential particle ratios (p + p )/(π+ + π−) and (K+ + K−)/(π+ + π−) in
the low UE limit (RT → 0) approach expectations from Monte Carlo generators such as
PYTHIA 8 with Monash 2013 tune and EPOS LHC, where the jet-fragmentation models
have been tuned to reproduce e+e− results
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