3,806 research outputs found
Bounds on the electromagnetic interactions of excited spin-3/2 leptons
We discuss possible deviations from QED produced by a virtual excited
spin-3/2 lepton in the reaction . Data recorded
by the OPAL Collaboration at a c.m. energy are used to
establish bounds on the nonstandard-lepton mass and coupling strengths.Comment: Latex, 5 pages, 7 ps figures. To be published in Phys. Rev.
Electrical transport properties of CuS single crystals
Electrical resistivity, transverse magnetoresistance and thermoelectric power measurements were performed on CuS high quality single crystals in the range 1.2-300 K and under fields of up to 16 T. The zero field resistivity data are well described below 55 K by a quasi-2D model, consistent with a carrier confinement at lower temperatures, before the transition to the superconducting state. The transverse magnetoresistance develops mainly below 30 K and attains values as large as 470% for a 16 T field at 5 K, this behaviour being ascribed to a band effect mechanism, with a possible magnetic field induced DOS change at the Fermi level. The transverse magnetoresistance shows no signs of saturation, following a power law with field Delta rho/rho(0) proportional to H(1.4), suggesting the existence of open orbits for carriers at the Fermi surface. The thermoelectric power shows an unusual temperature dependence, probably as a result of the complex band structure of CuS
LATTES: a novel detector concept for a gamma-ray experiment in the Southern hemisphere
The Large Array Telescope for Tracking Energetic Sources (LATTES), is a novel
concept for an array of hybrid EAS array detectors, composed of a Resistive
Plate Counter array coupled to a Water Cherenkov Detector, planned to cover
gamma rays from less than 100 GeV up to 100 TeVs. This experiment, to be
installed at high altitude in South America, could cover the existing gap in
sensitivity between satellite and ground arrays.
The low energy threshold, large duty cycle and wide field of view of LATTES
makes it a powerful tool to detect transient phenomena and perform long term
observations of variable sources. Moreover, given its characteristics, it would
be fully complementary to the planned Cherenkov Telescope Array (CTA) as it
would be able to issue alerts.
In this talk, a description of its main features and capabilities, as well as
results on its expected performance, and sensitivity, will be presented.Comment: Proceedings of the 35th International Cosmic Ray Conference
(ICRC2017), Busan, South Korea. Presented by R. Concei\c{c}\~{a}o. 8 pages;
v2: correct affiliation + journal referenc
Estudo sobre as Sub-Portadoras Piloto na Estimação e Equalização de Canais no Domínio da Frequência em Sistemas OFDM
Este trabalho tem por objetivo apresentar um estudo sobre os efeitos causados pela variação na quantidade de sub-portadoras piloto transmitidas no processo de estimação da resposta em frequência do canal de comunicação e no processo de equalização e detecção coerente dos símbolos transmitidos em receptores de sistemas OFDM. Para tal investigação serão propostos dois diferentes cenários de simulação numérica através da ferramenta computacional MATLAB®. Serão apresentadas análises qualitativas e quantitativas através de gráficos e cálculos matemáticos
LATTES: A new gamma-ray detector concept for South America
Currently the detection of Very High Energy gamma-rays for astrophysics rely on the measurement of the Extensive Air Showers (EAS) either using Cherenkov detectors or EAS arrays with larger field of views but also larger energy thresholds. In this talk we present a novel hybrid detector concept for a EAS array with an improved sensitivity in the lower energies (~ 100 GeV). We discuss its main features, capabilities and present preliminary results on its expected perfomances and sensitivities.This wide field of view experiment is planned to be installed at high altitude in South America making it a complementary project to the planned Cherenkov telescope experiments and a powerful tool to trigger further observations of variable sources and to detect transients phenomena
Polymorphism and Superconductivity in Bilayer Molecular Metals (CNB-EDT-TTF)4I3
Electrocrystallization from solutions of the dissymmetrical ET
derivative cyanobenzene-ethylenedithio-tetrathiafulvalene (CNB-EDT-TTF) in the
presence of triiodide I3
− affords two different polymorphs (β″ and κ) with the
composition (CNB-EDT-TTF)4I3, both with a bilayer structure of the donors. These
polymorphs differ in the packing patterns (β″- and κ-type) of the donor molecules in
each layer, in both cases with bifurcated C−N···H interactions effectively coupling
head-to-head donor molecules between layer pairs. Two β″ polymorphs can be
obtained with different degrees of anionic ordering. In one disordered phase, β″d, with
a smaller unit cell, the triiodide anions are disordered over two possible positions in a
channel between the donor bilayers, while in the ordered phase, β″o, the triiodide
anions occupy only one of those positions in this channel, leading to the doubling of
the unit cell in the layer plane. These results for β″ phases contrast with the κ
polymorph previously reported, for which weaker disorder of the triiodide anions, over
two possible orientations with 94 and 6% occupation factors, was observed. While the
β″ polymorphs remains metallic down to 1.5 K with a ρ300K/ρ4K resistivity ratio of 250, the κ polymorph presents a much smaller
resistivity ratio in the range of 4−10 and superconductivity with an onset temperature of 3.5 K.This work was partially supported in Portugal by FCT under
Contracts UID/Multi/04349/2013 and RECI/QEQ-QIN/
0189/2012 and grants to S.O. (SFRH/BD/72722/2010) and
S.R. (SFRH/BPD/113344/2015). Work in Bellaterra was
supported by MINECO-Spain (Grant FIS2015-64886-C5-4-
P) and Generalitat de Catalunya (2014SGR301). E.C.
acknowledges the support of the Spanish MINECO through
the Severo Ochoa Centers of Excellence Program under Grant
SEV-2015-0496.Peer reviewe
Determinação de minerais em queijos coalho do vale do Jaguaribe/CE visando uma Indicação Geográfica.
La(2/3)Sr(1/3)MnO(3) thin films deposited by laser ablation on lithium niobate substrates
The structural, magnetic and transport properties of La(2/3)Sr(1/3)MnO(3) thin films, prepared by laser ablation on LiNbO(3) substrates, have been characterized for different temperatures and applied magnetic fields. The deposited films have grown highly oriented, with a (111) preferred growth direction. Their lattice parameter was a = 3.86 angstrom. From the temperature dependence of the magnetization and of the electrical resistivity their Curie (T(C)) and metal-insulator (T(MI)) transition temperatures were determined (T(C) similar to 360 K, T(MI) similar to 260 K). Spin-dependent tunnelling across grain boundaries was found to dominate the behaviour of the transport properties of the La(2/3)Sr(1/3)MnO(3) thin films, on the studied temperature region.I.T. Gomes gratefully acknowledges a PhD grant from Fundação para a Ciência e Tecnologia (SFRH/BD/36348/2007)
Time-Lagged Correlation Analysis of Shellfish Toxicity Reveals Predictive Links to Adjacent Areas, Species, and Environmental Conditions
This work was funded by the project “MATISSE: A machine learning-based forecasting system for shellfish safety” (DSAIPA/DS/0026/2019). The work was also supported by national funds through Fundação para a Ciência e a Tecnologia (FCT) with references CEECINST/00102/2018, CEECIND/01399/2017, UIDB/04326/2020, UIDP/04326/2020 and LA/P/0101/2020 (CCMAR), UIDB/04516/2020 (NOVA LINCS), UIDB/00297/2020 (NovaMath), and UIDB/50021/2020 (INESC-ID). This project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 951970 (OLISSIPO project).Diarrhetic Shellfish Poisoning (DSP) is an acute intoxication caused by the consumption of contaminated shellfish, which is common in many regions of the world. To safeguard human health, most countries implement programs focused on the surveillance of toxic phytoplankton abundance and shellfish toxicity levels, an effort that can be complemented by a deeper understanding of the underlying phenomena. In this work, we identify patterns of seasonality in shellfish toxicity across the Portuguese coast and analyse time-lagged correlations between this toxicity and various potential risk factors. We extend the understanding of these relations through the introduction of temporal lags, allowing the analysis of time series at different points in time and the study of the predictive power of the tested variables. This study confirms previous findings about toxicity seasonality patterns on the Portuguese coast and provides further quantitative data about the relations between shellfish toxicity and geographical location, shellfish species, toxic phytoplankton abundances, and environmental conditions. Furthermore, multiple pairs of areas and shellfish species are identified as having correlations high enough to allow for a predictive analysis. These results represent the first step towards understanding the dynamics of DSP toxicity in Portuguese shellfish producing areas, such as temporal and spatial variability, and towards the development of a shellfish safety forecasting system.publishersversionpublishe
Structural and magnetic characterization of LaSrMnO3 thin films deposited by laser ablation on MgO substrates
La2/3Sr1/3MnO3-delta thin films were deposited by laser ablation on MgO substrates under low oxygen pressure cool down. Their structural and magnetic properties are presented. The magnetic and electrical resistivity measurements indicate a reduction of the Curie and the metal-insulator transition temperatures due to the formation of magnetic inhomogeneneous films, where clusters of a metallic phase are mixed in a magnetically disordered insulating matrix. By a low-angle X-ray reflectivity study we show that the thin films are chemically inhomogeneous with an oxygen deficiency in bulk of the film when compared with the film/air interfacial region
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