Abstract: Material suitable for the manufacture of valve shutters for the cylinders of the reciprocating compressors comprising a thermoplastic matrix consisting of polyether ether ketone (PEEK) or polyether imide (PEI) or mixtures thereof filled with glass and/or carbon fibers, characterized by comprising, in percentages by weight at least one of the following inorganic nano-particles, or a mixture thereof: 4-30% of wollastonite, 4-30% of metal oxide, 4-30% of carbon nano-fibers, 4-30% of sepiolite, 4-30% of mixtures of silica and alumina, 4-30% of fluoro-mica for a total quantity of 4-30% of nano-particles.

Abstract: Material suitable for the manufacture of valve shutters for the cylinders of the reciprocating compressors comprising a thermoplastic matrix consisting of polyether ether ketone (PEEK) or polyether imide (PEI) or mixtures thereof filled with glass and/or carbon fibers, characterized by comprising, in percentages by weight at least one of the following inorganic nano-particles, or a mixture thereof: 4-30% of wollastonite, 4-30% of metal oxide, 4-30% of carbon nano-fibers, 4-30% of sepiolite, 4-30% of mixtures of silica and alumina, 4-30% of fluoro-mica for a total quantity of 4-30% of nano-particles.

Abstract: A method for encoding and decoding media signals, includes the operations of generating at a transmitting side multiple descriptions associated to data of the media signals through a downsampling operation performed on the data, and decoding at a receiving side the multiple descriptions for reconstructing the data by merging the multiple descriptions. The operation of generating multiple descriptions further includes the operations of obtaining a spectral representation of the data, including bands associated to different ranges, the bands being obtained by a suitable quantization operation and including at least one highly quantized band, that is subjected to a higher degree of quantization. A scrambling operation is performed on the spectral representation by moving the at least one highly quantized band to a different range, the scrambling operation being performed prior the downsampling operation. In decoding, a descrambling operation is performed before the merging operation on the multiple descriptions.

Abstract: The method for encoding and/or decoding video signals, includes the operations of generating at a transmitter side a multiple descriptions vector associated to a pixel values vector of the video signals and decoding at a receiver side available descriptions vector for reconstructing the pixel values vector. The operation of generating a multiple descriptions vector includes the steps of obtaining the pixel values vector by selecting a group of pixels in a picture of the video signal and applying an encoding matrix to the pixel values vector. The decoding operation includes the step of applying a decoding matrix that is in an inverse relationship with the encoding matrix to the available descriptions vector to obtain the pixel values vector.