Abstract: A system for the detection of water in a sandwich structure for aircraft including: a microwave generator, at least two microwaves emitters/sensors mounted in the structure, and a microwave detector capable of detecting the microwaves after propagation in the structure; a data-processing unit associated with a library containing at least one model of the structure when empty. Also methods for implementing this system as well as an aircraft including such a system.

Abstract: A system for detecting and locating water in a sandwich-type structure for aircrafts, the system including means for heating the water contained in an intermediate layer of the sandwich-type structure, and means for recording at least one image of a surface of the sandwich-type structure, the image showing particular regions of the surface, corresponding to the presence of water in the intermediate layer. The means for heating the water include a device for emitting microwaves inside the sandwich-type structure, at a frequency essentially equal to the resonance frequency of the water molecules. The invention also relates to a method implemented by the system.

Abstract: A system for detecting and locating water in a sandwich-type structure for aircrafts, the system including means for heating the water contained in an intermediate layer of the sandwich-type structure, and means for recording at least one image of a surface of the sandwich-type structure, the image showing particular regions of the surface, corresponding to the presence of water in the intermediate layer. The means for heating the water include a device for emitting microwaves inside the sandwich-type structure, at a frequency essentially equal to the resonance frequency of the water molecules. The invention also relates to a method implemented by the system.

Abstract: A system for the detection of water in a sandwich structure for aircraft including: a microwave generator, at least two microwaves emitters/sensors mounted in the structure, and a microwave detector capable of detecting the microwaves after propagation in the structure; a data-processing unit associated with a library containing at least one model of the structure when empty. Also methods for implementing this system as well as an aircraft including such a system.

Abstract: The present invention relates to towers for wind generators or other large structural applications and uses a new construction concept, based on polymeric concrete. Polymeric concrete is composed of thermosetting resin and aggregates such as sand or gravel. Polymeric concrete has low maintenance costs and exceptional high resistance to corrosion, thus justifying its main usage in non-structural applications. Additionally, polymeric concrete has been used as mortar in the rehabilitation of civil structures, especially retrofitting of bridges and heritage buildings. Its advantages for these applications are the adherence to the traditional materials, higher compressive strength than traditional concrete and low specific weight.

Abstract: The present invention concerns a method and device to monitor the formation and removal of biofilms and other deposits in ducts, reservoirs and equipments, using vibration. The afore mentioned device is composed by an element that generates vibration (1) and an element that senses vibration (2), fixed on the external surface of a duct, reservoir or equipment (3). An electrical signal is generated by an electronic data acquisition unit (4) connected to the element that generates the vibration (1). The duct, reservoir or equipment (3) vibration leads to a signal in the vibration sensing element (2) which is measured and processed by the electronic data acquisition unit (4). The present invention is able to monitor the formation of deposits on surfaces and it can be applied, for example, to fluid distribution systems and fluid heating/cooling systems.

Abstract: A hexagonal table transformable to square or other shape by upwardly or downwardly rotating triangular or rounded shaped flap segments to optimize use of available square footage in a restaurant establishment for varieties of room layouts including ells, alcoves, walkways and doors.

Abstract: An organizational aid for EDP paper sheets is provided which permits adaptation to different EDP paper sizes. To this end the feed holes (15) located at the side margins of EDP paper sheets (11) are utilized. A fixed carrier member (10) has mounting elements (20, 26, 28) disposed thereon which comprise a bar (20) and two holding members (26, 28). U-shaped clamps (40) for accommodating and fixing the paper sheets (11) are detachably secured in the holding members (26, 28). One (28) of said holding members is movable along the longitudinal direction of the bar (20) while the other holding member (26) is fixedly joined to the bar (20) (FIG. 1).

Abstract: A folder (20) for paper sheets, especially EDP paper sheets (32), which have at least two spaced punched holes (34) at their lateral margins, is disclosed. A carrier body (21) is provided with resilient line-up pins (36) for accommodating paper sheets (32). Retaining means (38, 40) serve to fixedly secure the line-up pins (36) and the paper sheets (32). The line-up pins (36) are secured with one end thereof to the carrier body (21). The retaining means (38, 40) comprise telescope-type clamping bars (38) for receiving the other ends of the line-up pins (36). The carrier body (21) is an integral injection moulded part which constitutes bottom part (22), back (24) and top part (26) in a stable unit.

Abstract: A folder for paper sheets comprising a carrier body (20) is provided, said folder consisting of a bottom (21), a back (22) optionally including a handling hole (36), and a cover (23), said parts being joined to each other by means of permanently foldable creases (26, 27). The bottom (21) is adapted to be provided with a line-up mechanism including U-clamps. At least those regions of bottom (21) and cover (23) which adjoin the back (22) have a greater width than the remaining areas of bottom and cover, so that equal-sized symmetrical lugs (28) are formed which are integral with the carrier body (20). Such a folder may selectively be set up either in upright position, in horizontal position or suspended in a suspension file system.

Abstract: A device is disclosed for practicing the serve in tennis which provides a second or practice net. The practice net is erected above and in the same general vertical plane as the conventional net used for playing tennis where it will intercept balls hit over the conventional net. In addition, a recovery net is provided adjacent the bottom edge of the conventional net and is shaped to bias the intercepted balls toward the center of the conventional net and to return them toward the player. The conventional and practice nets may be separate or joined. Various powered or manual means are disclosed for erecting and tensioning the practice net.