Pulsar bow-shock nebulae. II. Hydrodynamical simulation

We present hydrodynamical simulations, using a 2-D two component model (ambient medium and pul sar wind have different specific heat ratios), of bow shocks in a representative regime for pu lsar wind driven bow-shock nebulae. We also investigate the behaviour of a passive toroidal ma gnetic field wound around the pulsar velocity direction. Moreover we estimate the opacity of t he bow-shock to penetration of ISM neutral hydrogen: this quantity affects observable properti es of the nebula, like its size, shape, velocity and surface brightness distribution. Finally we compare these numerical results with those from an analytical model. The development of mor e realistic models is needed in order to tune the criteria for searches of new such objects, a s well as to interpret data on the known objects.Comment: 17 pages, Latex, 6 Encapsulated PostScript figures, accepted for publication in A&

Bioethics of handedness: from evolution to resolution?

Departing from historical facts and speculations on the evolution of human right-hand domi¬nance (including theories on the development of right-handedness and cultural and linguistic sequellae of such a phenomenon), the present work stresses the delicate problem of the traditional favouring of one particular subpopulation, escalating into a real eugenic practice present sporadically even in modern times. The major hypothesis of the paper would be that the problem of forced handedness had been neglected by (bio)ethical theory, practice, and literature, and that it was absolved only recently by the results of modern neuroscientific research on handedness. According to that hypothesis, ending the discrimination took too much time precisely because the initial lack of the problem insight, which certainly should invoke cautiousness for any potentially similar phenomena in the future

La lingua in Traiano Boccalini

Nell'ambito della sofisticata retorica riinascimentale, Boccalini elabora una interessante tragitto fra le poetiche della sua epoca

Students from the Medieval Hungarian Kingdom at Italian Universities

Classification accuracy of features combination on different mRNASeq datasets. (PDF 61 kb

Select documents relating to the history of the Acciaiuoli (1319-1364) with special reference to Nicolo Acciaiuoli (1310-1365)

Thesis (Ph.D.)--Boston Universit

Online proton therapy monitoring: Clinical test of a Silicon-photodetector-based in-beam PET

Particle therapy exploits the energy deposition pattern of hadron beams. The narrow Bragg Peak at the end of range is a major advantage but range uncertainties can cause severe damage and require online verification to maximise the effectiveness in clinics. In-beam Positron Emission Tomography (PET) is a non-invasive, promising in-vivo technique, which consists in the measurement of the β+ activity induced by beam-tissue interactions during treatment, and presents the highest correlation of the measured activity distribution with the deposited dose, since it is not much influenced by biological washout. Here we report the first clinical results obtained with a state-of-the-art in-beam PET scanner, with on-the-fly reconstruction of the activity distribution during irradiation. An automated time-resolved quantitative analysis was tested on a lacrimal gland carcinoma case, monitored during two consecutive treatment sessions. The 3D activity map was reconstructed every 10 s, with an average delay between beam delivery and image availability of about 6 s. The correlation coefficient of 3D activity maps for the two sessions (above 0.9 after 120 s) and the range agreement (within 1 mm) prove the suitability of in-beam PET for online range verification during treatment, a crucial step towards adaptive strategies in particle therapy