6 documents found, page 1 of 1
Harmonic oscillator and nuclear pseudospin
Lisboa, Ronai; Malheiro, Manuel; De Castro, Antonio S. [UNESP]; Alberto, Pedro; Fiolhais, ManuelMade available in DSpace on 2022-04-28T18:59:43Z (GMT). No. of bitstreams: 0 Previous issue date: 2004-12-02; Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq); Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP); Fundació Catalana de Trasplantament; A generalized relativistic harmonic oscillator for spin 1/2 particles is studied. The Dirac Hamiltonian contains a scalar S and a vect...
Rhino-orbital-cerebral mucormycosis in a pediatric cancer patient
Couto, Maria Eduarda; Oliva, Tereza; Alberto, Pedro; Lebre, Ana; Pinto, Armando; Maia Ferreira, AnaAim: Mucormycosis infections are highly lethal in immunosuppressed patients. The authors present a rare case of successful treatment of the condition. Case description: A 14-year-old male with acute lymphoblastic lymphoma in remission was diagnosed with pansinusitis, cerebral osteomyelitis, and encephalitis with an abscess caused by Rhizopus sp. Neurosurgical drainage, endoscopic sinus surgery, and left eye enu...
Rhino-orbital-cerebral mucormycosis in a pediatric cancer patient
Couto, Maria Eduarda; Oliva, Tereza; Alberto, Pedro; Lebre, Ana; Pinto, Armando; Ferreira, Ana MaiaAim: Mucormycosis infections are highly lethal in immunosuppressed patients. The authors present a rare case of successful treatment of the condition. Case description: A 14-year-old male with acute lymphoblastic lymphoma in remission was diagnosed with pansinusitis, cerebral osteomyelitis, and encephalitis with an abscess caused by Rhizopus sp. Neurosurgical drainage, endoscopic sinus surgery, and left eye enu...
Relativistic particle in a box: Klein–Gordon versus Dirac equations
Alberto, Pedro; Das, Saurya; Vagenas, Elias C.The problem of a particle in a box is probably the simplest problem in quantum mechanics which allows for significant insight into the nature of quantum systems and thus is a cornerstone in the teaching of quantum mechanics. In relativistic quantum mechanics this problem allows also to highlight the implications of special relativity for quantum physics, namely the effect that spin has on the quantised energy s...
Analytic continuation of nucleon electromagnetic form factors in the time-like ...
Alberto, Pedro; Drago, Alessandro; Mangoni, Alessio; Moretti, Simone; Pacetti, Simone31 pages, 18 figures; The possibility to compute nucleon electromagnetic form factors in the time-like region by analytic continuation of their space-like expressions has been explored in the framework of the Skyrme model. We have developed a procedure to solve analytically Fourier transforms of the nucleon electromagnetic current and hence to obtain form factors defined in all kinematical regions and fulfillin...
Relativistic particle in a three-dimensional box
Alberto, Pedro; Das, Saurya; Vagenas, EliasWe generalize the work of Alberto, Fiolhais and Gil and solve the problem of a Dirac particle confined in a 3-dimensional box. The non-relativistic and ultra-relativistic limits are considered and it is shown that the size of the box determines how relativistic the low-lying states are. The consequences for the density of states of a relativistic fermion gas are briefly discussed.