1,721,177 research outputs found
Relativistic tunneling through two "transparent" successive barriers
Full text linkIn the case of tunneling of relativistic particles, differently from the nonrelativistic case, a limit of "transparent" barrier can also lead to an apparent "superluminal" behavior when considering the phase time. In this limit, the restricting condition of "opaque" barrier of the nonrelativistic case is avoided, nevertheless, the very thin width of a single barrier to obtain this "transparent" limit can result in a problem itself, for probing the effect. A combination of two successive transparent barriers can show an apparent "superluminal" behavior along a macroscopic arbitrary distance "L". Two solutions for energy E above and below the potential square barrier V are found, for both solutions there the apparent superluminal behavior is possible above a threshold of free travelling group velocity (energy) and dependent on the ratio barriers length free path as function of the ratio group velocity - speed of light
Raffreddamento di una massa di gas radiante e ionizzato in condizioni di non equilibrio termodinamico
No full textRadiative and collisional ionization nonequilibrium effects in the blunt body stagnation region at hypersonic speed
No full text
Decadimento della radiazione risonante facendo uso del profilo di Voigt
No full textAtti Accademia Scienze di Torin
Recensione a «Dulcis alebat Parthenope». Memorie dell’antico e forme del moderno all’ombra dell’Accademia Pontaniana, a cura di G. Germano - M. Deramaix, Napoli, Paolo Loffredo, 2020, pp. 456
No full textRecensione al vol. «Dulcis alebat Parthenope». Memorie dell’antico e forme del moderno all’ombra dell’Accademia Pontaniana, a cura di G. Germano - M. Deramaix, Napoli, Paolo Loffredo, 2020, pp. 456
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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