1,721,270 research outputs found
Head Injuries
No full textA cranio-encephalic trauma (TBI) is defined as a traumatically induced structural insult and/or an alteration of physiological brain functions as a result of an external force that produces the onset or worsening of clinical symptoms, and a prompt and structured clinical observation is mandatory. To promotes effective clinical assessment and right care for the severity of head injury, early management, observation, therapy, indications for and timing of CT scans and transport decisions are addressed in this chapter
Modellizzazione dei pannelli sandwich mediante un coside fem commerciale
No full textNota Scientifica 235 DIASP-Politecnico di Torin
On the N-pion extension of the Lovelace-Shapiro model
No full textWe reconsider a modification of the N-point amplitude of the Neveu-Schwarz (NS) model in which the tachyon becomes a pion by shifting its mass to zero and keeping the super-projective invariance of the integrand of the amplitude. For the scattering of four particles it reduces to the amplitude written by Lovelace and Shapiro that has Adler zeroes. We confirm that also the N-pion amplitude has Adler zeroes and show that it reduces to that of the non-linear sigma-model for alpha ' -> 0 keeping F-pi fixed. The four- and six-point flavour-ordered amplitudes satisfy tree-level unitarity since they can be derived from the correspondent amplitudes of the NS model in ten dimensions by suitably choosing the components of the momenta of the external mesons in the six extra dimensions. Negative norm states (ghosts) are shown to appear instead in higher-point amplitudes. We also discuss several amplitudes involving different external mesons
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