High-Temperature Superconducting Level Meter for Liquid Argon Detectors

Capacitive devices are customarily used as probes to measure the level of noble liquids in detectors operated for neutrino studies and dark matter searches. In this work we describe the use of a high-temperature superconducting material as an alternative to control the level of a cryogenic noble liquid. Lab measurements indicate that the superconductor shows a linear behaviour, a high degree of stability and offers a very accurate determination of the liquid volume. This device is therefore a competitive instrument and shows several advantages over conventional level meters.Comment: 13 pages, 11 figures. Accepted for publication in JINS

Indicators of knowledge, usefulness, and use of ICT among primary schoolteachers

This paper presents a study on the perceptions of primary school teachers regarding their knowledge, usefulness, and use of Information and Communication Technologies (ICT) in education. Likewise, the relationship between sex, age, working time and the educational center in which it is found with the perceptions about ICT is obtained. To answer these questions, a battery of 14 categorical closed questions is designed, divided into four blocks: socio-demographic information; knowledge of ICT; usefulness of ICT; and use of ICT. In the context of measuring the knowledge, usefulness and use of ICT in education, the novelty of this work relies on the design of an indicator for each of the ICT-related blocks following the methodology of Human Development Indicators created by the United Nations Development Program. In this research, 119 teachers from Spanish primary schools were chosen as the study sample to answer the questions’ battery. The results show a direct relationship between knowledge, usefulness, and use, although not significant. Although teachers are aware of the usefulness of ICT, and the Covid-19 pandemic has increased the use of technological tools for planning teaching in blended or distance learning lessons, this does not mean teachers have a greater knowledge of ICT. In addition, the findings indicate a greater knowledge by teachers in public schools, which contrasts with the finding that teachers in grant-assisted schools make the most use of ICT and find it the most useful. Finally, it is also suggested that the study's methodology and approach could be applied to other contexts or countries

On "New Massive" 4D Gravity

We construct a four-dimensional (4D) gauge theory that propagates, unitarily, the five polarization modes of a massive spin-2 particle. These modes are described by a "dual" graviton gauge potential and the Lagrangian is 4th-order in derivatives. As the construction mimics that of 3D "new massive gravity", we call this 4D model (linearized) "new massive dual gravity". We analyse its massless limit, and discuss similarities to the Eddington-Schroedinger model.Comment: 17 pages, v2 : version published in JHE

Non-minimal kinetic coupling and Chaplygin gas cosmology

In the frame of the scalar field model with non minimal kinetic coupling to gravity, we study the cosmological solutions of the Chaplygin gas model of dark energy. By appropriately restricting the potential, we found the scalar field, the potential and coupling giving rise to the Chaplygin gas solution. Extensions to the generalized and modified Chaplygin gas have been made.Comment: 18 pages, 2 figures. To appear in EPJ

Migração de sistemas tradicionais para PWA's: experiência no +Precoce.

A produção de novilho precoce pode ser definida como o conjunto de demandas, oportunidades e desafios que se configuram dentro e fora da porteira, muitas vezes equiparáveis ao cenário de uma corrida. A Plataforma +Precoce surge com o propósito de fornecer indicadores que auxiliem produtores e técnicos a minimizar as incertezas dentro de sistemas de produção de novilho precoce, possibilitando simular o desempenho econômico ao considerar diversos parâmetros relacionados à cria. Para a primeira versão do +Precoce, desenvolvida em 2017, foram criadas duas ferramentas computacionais: uma de gestão (denominada backend) e outra de simulação (denominada frontend)

Scaling relations of z ∼ 0.25–1.5 galaxies in various environments from the morpho-kinematics analysis of the MAGIC sample

Context. The evolution of galaxies is influenced by many physical processes, which may vary depending on their environment. Aims. We combine Hubble Space Telescope (HST) and Multi-Unit Spectroscopic Explorer (MUSE) data of galaxies at 0.25-1.5 to probe the impact of environment on the size-mass relation, the main sequence (MS) relation, and the Tully-Fisher relation (TFR). Methods. We perform a morpho-kinematics modelling of 593 [O-II] emitters in various environments in the COSMOS area from the MUSE-gAlaxy Groups In Cosmos survey. The HST F814W images are modelled with a bulge-disk decomposition to estimate their bulge-disk ratio, effective radius, and disk inclination. We use the [O-II]λλ3727, 3729 doublet to extract the galaxies ionised gas kinematics maps from the MUSE cubes, and we model those maps for a sample of 146 [O-II] emitters, including bulge and disk components constrained from morphology and a dark matter halo. Results. We find an offset of 0.03 dex (1 significant) on the size-mass relation zero point between the field and the large structure sub-samples, with a richness threshold of N=10 to separate between small and large structures, and of 0.06 dex (2) with N=20. Similarly, we find a 0.1 dex (2A) difference on the MS relation with N=10 and 0.15 dex (3) with N=20. These results suggest that galaxies in massive structures are smaller by 14% and have star formation rates reduced by a factor of 1.31.5 with respect to field galaxies at z 0.7. Finally, we do not find any impact of the environment on the TFR, except when using N=20 with an offset of 0.04 dex (1). We discard the effect of quenching for the largest structures, which would lead to an offset in the opposite direction. We find that, at z0.7, if quenching impacts the mass budget of galaxies in structures, these galaxies would have been affected quite recently and for roughly 0.7-+1.5 Gyr. This result holds when including the gas mass but vanishes once we include the asymmetric drift correction