7,508 research outputs found
Lower Mass Bound on the mass via Neutrinoless Double Beta Decay in a 3-3-1 Model
The discovery of neutrino masses has raised the importance of studies in the
context of neutrinoless double beta decay, which constitutes a landmark for
lepton number violation. The standard interpretation is that the light massive
neutrinos, that we observed oscillating in terrestrial experiments, mediate
double beta decay. In the minimal 3-3-1 model, object of our study, there is an
additional contribution that stems from the mixing between a new charged vector
boson, , and the Standard Model W boson. Even after setting this
mixing to be very small, we show that tight constraints arise from the
non-observation of neutrinoless double beta decay. Indeed, we derive bounds on
the mass of the gauge boson that might exceed those from collider
probes, and most importantly push the scale of symmetry breaking beyond its
validity, leading to the exclusion of the minimal 3-3-1 model.Comment: 16 pages, 5 figure
Geologia e educação ambiental : a aprendizagem baseada na resolução de problemas como proposta metodológica
ara além de destacar o papel da geologia na educação ambiental (dimensão educativa de carácter transversal), o presente estudo apresenta a Aprendizagem Baseada na Resolução de Problemas como uma proposta metodológica para educar para o desenvolvimento sustentável. Nesse sentido, apresentam-se alguns dos resultados obtidos com a aplicação de um programa de intervenção realizado com 24 alunos do 3ºciclo do ensino básico (faixa etária dos 12-15 anos) e abordando a temática “Gestão Sustentável dos Recursos” Para além de 10 aulas de 45 minutos o programa contemplou uma saida de campo a uma antiga exploração mineira, local geologicamente relevante em termos de gestão sustentável de recursos minerais
Perceptions and expectations of college students about the Internet of Things
The Internet is increasingly used as a means of communication of excellence. With the increasing ease and access to virtual communication, namely through social networks, it is verified that the relationships between people have assumed new forms of expression and higher levels of importance in society. In addition to communication between people, there is also an increasing possibility of any object communicating and connecting to other objects, with a unique way of identifying, anywhere, with devices connected to the Internet, this being the essential concept of Internet of Things (IoT). In this paper, our main goal is understand how college students represent IoT and what are their perceptions and expectations about it. From their point of view, is important to verify what is the impact that IoT may have on their personal lives, academic performance and in society. According to the methodology adopted we performed individual interviews with a population of college students. Data were processed through context analyses, after being transcribed and analyzed, using a typical software - Leximancer. Our findings showed that, in general, participants have an accurate perception about the Internet of Things, and how it works, and that they also have positive expectations in relation to it, considering it can be useful to our day-to-day life. Although, at the same time, they highlight the importance of being careful in terms of privacy, threats, vulnerabilities and risks associated to the internet.info:eu-repo/semantics/acceptedVersio
Propagação assexuada da cana-do-reino (Arunda donax L.)
bitstream/item/31272/1/comunicado-158.pd
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