Abstract: This invention relates to the controlled realization of ordered superstructures of octapod-shaped colloidal nanocrystals, formed either in the liquid phase or on a solid substrate. These structures can be applied in many fields of technology.

Abstract: This invention relates to the controlled realization of ordered superstructures of octapod-shaped colloidal nanocrystals, formed either in the liquid phase or on a solid substrate. These structures can be applied in many fields of technology.

Abstract: This invention relates to the controlled growth of uniform octapod-shaped colloidal nanocrystals and use thereof. These octapod-shaped nanocrystals can be applied in many fields of technology. This represents the first approach reported so far for the predictable and controlled fabrication of octapod-shaped nanocrystals. The synthesis approach is applicable to a broad range of materials, such as group II-VI semiconductor nanocrystals but is not limited to these materials. Using several cation exchange and oxidation procedures, we also demonstrate in this application that extremely uniform octapod-shaped nanocrystals of other materials can be synthesized, including various semiconductors, metals and insulators.

Abstract: Track-tightening device for crawlers wherein the bogie comprises a track-tightening structure to modify the wheel base of the front and back wheels of the bogie equipped with one or more movable supporting rollers capable of always remaining at the same distance from the idler wheel of the track-tightener under all operating conditions.

Abstract: An integrated mechanical transmission system of an excavator (91), equipped with a diesel engine (140), and comprising an undercarriage (110) carrying a mounted rotary table (104) carrying a tower (95), comprises: an electric generator (142) coupled with the diesel engine (140); a first linear electric motor (100) for commanding the rotation of the rotary table (104); at least a second high torque reversible electric motor (121) with innovative technology for commanding the translation of the vehicle; at least one voltage and current intensity regulating group (144) connected to the electric generator (142); a rotary distributor with contacts (147) provided on the rotary table (104) and electrically connected to the first linear motor (100) and to the second high torque reversible motor (121) with innovative technology; a battery group (145) connected to the regulation group (144).

Abstract: In order to ensure that the working life of the sealing device is at least comparable to that of the remaining parts of the crawler track, the resilient annular element comprises a first annular portion and a second annular portion. The first annular portion has a cross-section in the form of a bulge, while the second annular portion has a cross-section in the form of a boss. The first annular portion is delimited by an annular contact surface which, when the annular seal is assembled, but not mounted in its seat, forms together with the incident joining plane of the rigid annular sealing element, an angle “&agr;” of between 0° and 30°.

Abstract: A crawler link used in an endless track vehicle having monolithic shoe portions made of iron and an elastomer. The link comprises a shoe portion, a bush, rails and hinge eyelets, and is cast in one piece to avoid the disassembling of components during replacement. An elastomer portion, with tapered surfaces for efficient gripping and traction, is directly applied by vulcanization to the lower surface of the shoe portion of the link.

Abstract: To limit costs without compromising its life while at the same time simplifying its construction, the tracked running gear assembly (1) has its load-bearing wheels (4) and its track tensioning wheel (3) each comprising an idle roller (6) of austempered cast iron maintained on a shaft (7) of construction-type steel by two locking elements (8) of spheroidal graphite cast iron mounted as an interference fit on the ends of said shaft (7). The idle roller (6) comprises a lubricant chamber (9), the seal (19) being housed in the locking elements (8). The sprocket ring (26) of the drive wheel (2) is of austempered cast iron.