0

introduction: the main goal of spect imaging is to determine activity distribution inside the organs of the body. however, due to photon attenuation, it is almost impossible to do a quantitative study. in this paper, we suggest a mathematical relationship between activity distribution and its corresponding projections using a transfer matrix. monte carlo simulation was used to find a precise tr...

In fact, Stella felt some resentment towards the challenge itself. It was not that she did not 'do creative’; it was more about her fear of unknown, the fear of losing the safety of routine the fear of change. She had read a few articles about resistance to change before and was able to recognise the tell-tale symptoms of resistance not to change per se, but rather to the uncertainties and pote...

Fifteen patients with CT-documented orbital lesions were evaluated with MR imaging at 1.5 T with both conventional spin-echo (SE) and short inversion time inversion recovery (STIR) sequences. Fat signal was reliably nulled at inversion times of approximately 120-200 msec in all cases, thereby allowing clear detection of all retrobulbar lesions and normal structures on STIR images as markedly hy...

Turning back after engine failure during the take off phase of flight in a single engine aircraft is examined using a simplified analytical model. The important parameters are identified. The analysis shows that the optimum flight path is teardrop shaped with a 45◦ bank angle at stall velocity during the turn. The effects of engine failure altitude, wind direction and velocity, and bank angle o...

This article describes an experimental investigation on a reinforced concrete bridge deck to compare half-cell potential measurements carried out from the under-side to those obtained from the upper-side of the deck. It was noted that the results are similar but are not identical. This particular situation is caused by the physical conditions of the upper-side and lower-side of the decks which,...

In this paper, we analyze the security claims of Extended Generalized Feistel Networks (EGFNs) schemes proposed by Berger et al [1]. We provide impossible differentials for 10 rounds of EGFNs with 16 branches which add up one round to the claim of 9 rounds in the impossible differential trail. Therefore, impossible differential trail covers 10 rounds for the EGFNs scheme, which is the best resu...

RÉSUMÉ Dans cet article, nous définissons un nouveau critère de cohésion thématique permettant de pondérer les termes d’un lexique thématique en fonction de leur pertinence. Le critère s’inspire des approches Web as corpus pour accumuler des connaissances exogènes sur un lexique. Ces connaissances sont ensuite modélisées sous forme de graphe et un algorithme de marche aléatoire est appliqué pou...