Repository logo

Browsing by Issue Date, starting with "2017-08-30"

Filter results by year or month
Now showing 1 - 2 of 2
  • E-waste Management in Portugal: Legislation, Practices and Recommendations
    Publication . Marques, C. G.; Silva, Vasco
    The use of electrical and electronic devices has grown exponentially in the last years thanks to technological advances and its wide dissemination. Consequently, the number of obsolete equipment (electronic waste or e-waste) has also increased significantly, becoming a major problem for society. This paper deals with electronic waste and explains the concept and risks for the particular case of Portugal. Measures to reduce the problem such as legislation, education production R&D and social responsibility are also discussed. And finally, a survey is presented which was carried out in two Portuguese Higher Education institutions with a view to determining students' awareness, attitudes and opinions on this matter.
    2017-08-30Journal article Open access Show more
  • The hadronic interaction model SIBYLL 2.3c and Feynman scaling
    Publication . Riehn, Felix; Dembinski, Hans P.; Engel, Ralph; Fedynitch, Anatoli; Gaisser, Thomas K.; Stanev, Todor
    The Monte Carlo model Sibyll has been designed for efficient simulation of hadronic multiparticle production up to the highest energies as needed for interpreting cosmic ray measurements. For more than 15 years, version 2.1 of Sibyll has been one of the standard models for air shower simulation. Motivated by data of LHC and fixed-target experiments and a better understanding of the phenomenology of hadronic interactions, we have developed an improved version of this model, version 2.3, which has been released in 2016. In this contribution we present a revised version of this model, called Sibyll 2.3c, that is further improved by adjusting particle production spectra to match the expectation of Feynman scaling in the fragmentation region. After a brief introduction to the changes implemented in Sibyll 2.3 and 2.3c with respect to Sibyll 2.1, the current predictions of the model for the depth of shower maximum, the number of muons at ground, and the energy spectrum of muons in extensive air showers are presented.
    2017-08-30Journal article Open access Show more