Abstract: A synchronizer for mechanical transmissions having a phasing system configured so as to include a plurality of first cavities on an internal cylindrical surface of a rim of a hub, the hub torsionally connected with a transmission shaft, forming the external teeth of the hub and, for each of the first cavities, either a tooth which radially protrudes from an external cylindrical surface of a synchronizing ring of the synchronizer and is arranged to engage in the first cavity, or a connecting pin arranged to engage on one side the first cavity and on the other a respective second cavity on the external cylindrical surface, wherein the first cavities have an arc- or round-shaped cross-section.

Abstract: The synchronizer may have a hub provided with external teeth. An actuating sleeve may be provided with internal teeth meshing with the external teeth of the hub. At least one synchronizing ring may be provided with external teeth arranged to mesh with the internal teeth of the actuating sleeve and has, on its radially internal side, a friction surface arranged to cooperate with a friction surface associated to a respective gear wheel to allow generation of a friction torque between the synchronizing ring and the associated gear wheel. A pre-synchronization system may have more than two blocking elements operatively placed between the hub and the actuating sleeve. A phasing system may be provided to ensure a given angular positioning of the synchronizing ring with respect to the hub about the longitudinal axis.

Abstract: Magnetic resonance imaging method and device, preferably using T2-weighted Fast Spin Echo (FSE) sequences, wherein a first set of magnetic resonance signals corresponding to predetermined phase-encoding gradients and at least one second set of received magnetic resonance signals, corresponding to further predetermined phase-encoding gradients, are acquired from the body under examination, using multi-echo sequences, such that echoes with the same echo index are assigned to different phase-encoding gradients, said first set and said at least one second set being entered into at least two corresponding k-space matrices, and the at least two k-space matrices being combined into a single k-space matrix from which an image is generated, wherein each k-space matrix is incompletely filled such that, for the same phase encoding gradients, one matrix contains the higher-intensity received signals, and at least another matrix contains no signal.

Abstract: A method of reconstructing an MRI or ultrasound biomedical image, based on compressed sensing includes exciting a body under examination; acquiring image data from the generated signals, wherein the signals are acquired by pseudo-random undersampling; reconstructing the image using a nonlinear iterative algorithm for minimizing an optimization function containing one or more terms for image data sparsity in one or more predetermined domains with a data fidelity constraint term ensuring fidelity to the acquired image data; wherein two or more sets of image data are acquired from the generated signals, each data set being acquired in a different undersampling scheme and/or a different acquisition mode such as to make expected and unavoidable artifacts incoherent; each of the acquired image data set is multiplied by a correction matrix ?.