Abstract: The invention relates to a system for securing sleepers in a ballastless track formed by a base plate, sleepers and an interposed elastic intermediate plate, wherein the sleeper body comprises at least one through-hole, and the base plate comprises the corresponding blind holes in which a securing pin is embedded, to which a guide rod that can be inserted in the through-hole is joined, via which the sleeper is secured to the base plate in such a way that no additional pretensioning is added to that caused by the positioning of the sleeper thereon, and only a certain amount of vertical movement is permitted, forming a disassemblable assembly of the securing elements and the sleepers.

Abstract: The invention relates to an overhead guided-transport track span having a U-shaped cross section, the two arms of which form lateral walls (4, 5) of said track, and the central region of which, connecting the two arms, forms a load-bearing slab (6) of said track, characterised in that said load-bearing slab (6) comprises at least one groove (10, 11) that is provided in said slab longitudinally along said span and is designed to be able to receive a running support (12, 13) of a guided-transport vehicle intended to travel on said track.

Abstract: The invention relates to a span (2) for railway tracks with a self-supporting U-shaped structure (3), defining a section of the path for a piece of rolling stock (1), travelling on the railway track and at least one further element (6, 10, 11, 14) for the travel of the rolling stock (1) on the railway track and which can support, guide and/or supply the rolling stock (1). According to the invention, at least one (6) of the additional elements (6, 10, 11, 14) is directly integrated in the U-shaped element (3).

Abstract: In a monolithic dual wavelength laser device in which an infrared laser part 100 and a red laser part 130 are built on one n-type GaAs substrate 101, a p-type first cladding layer 105 of the infrared laser part 100 and a p-type first cladding layer 135 of the red laser part 130 are made of the same material and have different impurity concentrations.

Abstract: The invention relates to a span (2) for railway tracks with a self-supporting U-shaped structure (3), defining a section of the path for a piece of rolling stock (1), travelling on the railway track and at least one further element (6, 10, 11, 14) for the travel of the rolling stock (1) on the railway track and which can support, guide and/or supply the rolling stock (1). According to the invention, at least one (6) of the additional elements (6, 10, 11, 14) is directly integrated in the U-shaped element (3).

Abstract: Structural system comprising a track for a magnetic levitation transport system powered by a linear electric motor. This structural system comprising a track for a magnetic levitation transport system powered by a linear electric motor is notable in that it combines two T-shaped tracks produced in a single U-shaped structure, the vertical bars of the T-shapes and the U-shapes being joined, and the lower slabs of the track-supporting U-shapes contributing to the general strength of the engineering structure, in the absence of lateral screens.

Abstract: This structural system comprising a track for a magnetic levitation transport system powered by a linear electric motor is notable in that it combines two T-shaped tracks produced in a single U-shaped structure, the vertical bars of the T-shapes and the U-shapes being joined, and the lower slabs of the track-supporting U-shapes contributing to the general strength of the engineering structure, in the absence of lateral screens.

Abstract: Beams extend transversely outwards from at least one side of each span beyond the corresponding side flange and shelf. Each beam is of a length in the transverse direction and of strength that are predetermined to be sufficient for enabling additional structures, e.g. slabs, to be installed subsequently on said beams, which additional structures preferably extend said soleplates outwards, in particular to form a station.