526 research outputs found
Una aproximación a las representaciones del alumnado sobre el Universo
This study explains how the children from secondary school (age 14-18) represent the structure of the universe and the way it may be useful in daily teaching. The results obtained describe the same conceptualization difficulties that the younger students already have, as well as the need for studying deeply the process for learning of those students as far as, having dealt with those contents before, they have not reached the expected scientific knowledge concerning the topic
Contenidos, metodología y alumnado : una valoración crítica de la enseñanza en BUP y COU
The aim of this study was to compare the interest of the students in Natural Science in front of three other subjects such as Mathematics, Literature and Geography & History. The selected items of the contents of every subject, and the importance of teaching as an influential factor on students were also studied. The results showed that both the selection of the contents and the methods should have been modified
Genomic characterization of individuals presenting extreme phenotypes of high and low risk to develop tobacco-induced lung cancer
Single nucleotide polymorphisms (SNPs) may modulate individual susceptibility to carcinogens. We designed a genome-wide association study to characterize individuals presenting extreme phenotypes of high and low risk to develop tobacco-induced non-small cell lung cancer (NSCLC), and we validated our results. We hypothesized that this strategy would enrich the frequencies of the alleles that contribute to the observed traits. We genotyped 2.37 million SNPs in 95 extreme phenotype individuals, that is: heavy smokers that either developed NSCLC at an early age (extreme cases); or did not present NSCLC at an advanced age (extreme controls), selected from a discovery set (n=3631). We validated significant SNPs in 133 additional subjects with extreme phenotypes selected from databases including >39,000 individuals. Two SNPs were validated: rs12660420 (p(combined)=5.66x10(-5); ORcombined=2.80), mapping to a noncoding transcript exon of PDE10A; and rs6835978 (p(combined)=1.02x10(-4); ORcombined=2.57), an intronic variant in ATP10D. We assessed the relevance of both proteins in early-stage NSCLC. PDE10A and ATP10D mRNA expressions correlated with survival in 821 stage I-II NSCLC patients (p=0.01 and p<0.0001). PDE10A protein expression correlated with survival in 149 patients with stage I-II NSCLC (p=0.002). In conclusion, we validated two variants associated with extreme phenotypes of high and low risk of developing tobacco-induced NSCLC. Our findings may allow to identify individuals presenting high and low risk to develop tobacco-induced NSCLC and to characterize molecular mechanisms of carcinogenesis and resistance to develop NSCLC
Reconstruction of interactions in the ProtoDUNE-SP detector with Pandora
The Pandora Software Development Kit and algorithm libraries provide
pattern-recognition logic essential to the reconstruction of particle
interactions in liquid argon time projection chamber detectors. Pandora is the
primary event reconstruction software used at ProtoDUNE-SP, a prototype for the
Deep Underground Neutrino Experiment far detector. ProtoDUNE-SP, located at
CERN, is exposed to a charged-particle test beam. This paper gives an overview
of the Pandora reconstruction algorithms and how they have been tailored for
use at ProtoDUNE-SP. In complex events with numerous cosmic-ray and beam
background particles, the simulated reconstruction and identification
efficiency for triggered test-beam particles is above 80% for the majority of
particle type and beam momentum combinations. Specifically, simulated 1 GeV/
charged pions and protons are correctly reconstructed and identified with
efficiencies of 86.1% and 84.1%, respectively. The efficiencies
measured for test-beam data are shown to be within 5% of those predicted by the
simulation.Comment: 39 pages, 19 figure
Inclusive J/ψ production at forward and backward rapidity in p-Pb collisions at √sNN=8.16 TeV
Inclusive J/psi production is studied in p-Pb interactions at a centre-of-mass
energy per nucleon-nucleon collision sqrt(s_NN) = 8.16TeV, using the ALICE detector at the
CERN LHC. The J/psi meson is reconstructed, via its decay to a muon pair, in the centre-of-mass
rapidity intervals 2.03 < ycms < 3.53 and -4.46 < ycms < -2.96, where positive
and negative ycms refer to the p-going and Pb-going direction, respectively. The transverse
momentum coverage is pT < 20 GeV/c. In this paper, ycms- and pT-differential cross
sections for inclusive J/psi production are presented, and the corresponding nuclear modification
factors RpPb are shown. Forward results show a suppression of the J/psi yield with
respect to pp collisions, concentrated in the region pT < 5 GeV/c. At backward rapidity
no significant suppression is observed. The results are compared to previous measurements
by ALICE in p-Pb collisions at sqrt(s_NN) = 5.02TeV and to theoretical calculations. Finally,
the ratios RFB between forward- and backward-ycms RpPb values are shown and discussed
Energy dependence and fluctuations of anisotropic flow in Pb-Pb collisions at √sNN=5.02 and 2.76 TeV
Measurements of anisotropic flow coefficients with two- and multi-particle cumulants
for inclusive charged particles in Pb-Pb collisions at sqrt(s_NN) = 5.02 and 2.76TeV
are reported in the pseudorapidity range |eta|< 0.8 and transverse momentum 0.2 < pT <
50 GeV/c. The full data sample collected by the ALICE detector in 2015 (2010), corresponding
to an integrated luminosity of 12.7 (2.0) ub^-1 in the centrality range 0-80%,
is analysed. Flow coefficients up to the sixth flow harmonic (v6) are reported and a detailed
comparison among results at the two energies is carried out. The pT dependence
of anisotropic flow coefficients and its evolution with respect to centrality and harmonic
number n are investigated. An approximate power-law scaling of the form vn(pT) ~ pT^(n/3)
is observed for all flow harmonics at low pT (0.2 < pT < 3 GeV/c). At the same time, the
ratios vn/vm^(n/m) are observed to be essentially independent of pT for most centralities up to
about pT = 10 GeV/c. Analysing the differences among higher-order cumulants of elliptic flow (v2),
which have different sensitivities to flow fluctuations, a measurement of the standardised
skewness of the event-by-event v2 distribution P(v2) is reported and constraints
on its higher moments are provided. The Elliptic Power distribution is used to parametrise
P(v2), extracting its parameters from fits to cumulants. The measurements are compared
to different model predictions in order to discriminate among initial-state models and to
constrain the temperature dependence of the shear viscosity to entropy-density ratio
Inclusive J/ψ production at forward and backward rapidity in p-Pb collisions at √sNN=8.16 TeV
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Mercado; Meres, M.; Meza, C. S.; Mhlanga, S.; Miake, Y.; Micheletti, L.; Mieskolainen, M. M.; Mihaylov, D. L.; Mikhaylov, K.; Mischke, A.; Mishra, A. N.; Miskowiec, D.; Mitra, J.; Mitu, C. M.; Mohammadi, N.; Mohanty, A. P.; Mohanty, B.; Khan, M. Mohisin; De Godoy, D. A. Moreira; Moreno, L. A. P.; Moretto, S.; Morreale, A.; Morsch, A.; Muccifora, V; Mudnic, E.; Muehlheim, D.; Muhuri, S.; Mukherjee, M.; Mulligan, J. D.; Munhoz, M. G.; Muenning, K.; Munoz, M. I. A.; Munzer, R. H.; Murakami, H.; Murray, S.; Musa, L.; Musinsky, J.; Myers, C. J.; Myrcha, J. W.; Naik, B.; Nair, R.; Nandi, B. K.; Nania, R.; Nappi, E.; Narayan, A.; Naru, M. U.; Nassirpour, A. F.; Natal da Luz, H.; Nattrass, C.; Navarro, S. R.; Nayak, K.; Nayak, R.; Nayak, T. K.; Nazarenko, S.; De Oliveira, R. A. Negrao; Nellen, L.; Nesbo, S., V; Neskovic, G.; Ng, F.; Nicassio, M.; Niedziela, J.; Nielsen, B. S.; Nikolaev, S.; Nikulin, S.; Nikulin, V; Noferini, F.; Nomokonov, P.; Nooren, G.; Noris, J. C. 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First measurement of Ξc0 production in pp collisions at s=7 TeV
The production of the charm-strange baryon Csi0c is measured for the first time at the LHC via its
semileptonic decay into e+Csi-νe in pp collisions at sqrt(s) = 7 TeV with the ALICE detector. The transverse momentum (pT) differential cross section multiplied by the branching ratio is presented in the interval 1 < pT < 8 GeV/c at mid-rapidity, |y| < 0.5. The transverse momentum dependence of the Csi0c baryon production relative to the D0 meson production is compared to predictions of event generators with various tunes of the hadronisation mechanism, which are found to underestimate the measured cross- section ratio.The production of the charm-strange baryon Csi0c is measured for the first time at the LHC via its
semileptonic decay into e+Csi-νe in pp collisions at sqrt(s) = 7 TeV with the ALICE detector. The transverse momentum (pT) differential cross section multiplied by the branching ratio is presented in the interval 1 < pT < 8 GeV/c at mid-rapidity, |y| < 0.5. The transverse momentum dependence of the Csi0c baryon production relative to the D0 meson production is compared to predictions of event generators with various tunes of the hadronisation mechanism, which are found to underestimate the measured cross- section ratio
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
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