Araujo, Daniel

An optical amplifier comprising: a first optical fiber section (2a) that is configured to receive a light as an input (1); a fiber beam splitter (3) connected to the first optical fiber section (2a); a second optical fiber section (2b); an amplification section (9) which comprises a laser diode (7) which is optically coupled to a second end (22) of the second optical fiber section (2b) and is configured to receive the light, amplify the light, thereby producing amplified light, and transmit the amplified light towards the second end (22) of the second optical fiber section (2b); the second optical fiber section (2b) is configured to receive via its second end (22) the amplified light and direct it towards the fiber beam splitter (3); a third optical fiber section (2c) connected to the fiber beam splitter (3).

A multi-channel light-emitting diode constant-current-and-light power driving circuit and an electronic device are provided. The circuit includes a power supply unit, a light-emitting unit, a power transistor unit and a control uni. The power supply unit is connected to the light-emitting unit and configured to transmit a voltage signal to the light-emitting unit. The power transistor unit is connected to the light-emitting unit and configured to adjust the current of the light-emitting unit to control the light-emitting unit to be in a constant current state. The control unit is connected to the power supply unit and the power transistor unit, respectively, and configured to monitor the power transistor unit, and adjust the voltage signal through the power supply unit according to a monitored signal to control a voltage value of the power transistor unit to be within a first target value range.

A fiberized acousto-optic device for shifting a frequency of light, comprising: a first optical fiber section that is configured to receive light; a fiber beam splitter (3) connected to the first optical fiber section (2a); a second optical fiber section (2b) connected to the fiber beam splitter (3); an acousto-optic modulator (5) which is optically coupled the second optical fiber section (2b) and is configured to shift a frequency of at least a portion of the light, thereby producing shifted light (SL); a retroreflector (7) optically coupled to the acousto-optic modulator (5) and configured to receive the shifted light (SL) and reflect at least part of it back to the acousto-optic modulator (5) which is further configured to transmit at least part of the reflected light towards the second fiber section; a third optical fiber section (2c) connected to the fiber beam splitter (3).

A problem with milking dairy cows is that fitting and removing milking teat cups can be time consuming and cause inefficiencies. It is an object of a preferred embodiment to go at least some way towards address this. The invention incorporates an apparatus for delivering milking teat cups to a dairy cow. It has a housing 1, an extender arm 3, a holster 4, teat cups 5, cords 8, and rollers 14. The arm 3 carries the holster 4 and cups 5 between stowed and extended positions. Each cord 8 is engaged with a respective one of the rollers 14, is connected to a respective one of the cups 5, extends to the holster, and can be drawn in by movement of the respective roller 14. Each roller 14 allows its cord 8 to extend sufficiently to enable the teat cup connected to that cord to be removed from the holster and engaged with a cow's teat for milking. Further, each roller 14 is adapted to draw-in its cord to pull the associated cup 5 to a docking position on the holster.

A nacelle support system (1) for a nacelle (2) of a wind turbine, comprising: a - support module (3) comprising: an open lower portion (30); an open front portion (31); a compartment (32) configured to receive a nacelle (2) through the open lower portion (30); and a locking system (33) for locking the nacelle (2) in an operative position (O) within the compartment (32); and - a support structure (4) comprising a base portion (40) and structural elements (41) extending upwards from the base portion (40); the nacelle support module (3) being configured to be connected to an upper part (410) of each of the structural elements (41); and the support structure (4) being configured such that an unobstructed operational space (S) is provided below the support module (3), said operational space (S) being configured to allow a nacelle (2) to be inserted into and/or removed from the compartment (32) through the open lower portion (30).

A cover assembly for the truck bed of a pick-up type vehicle, said cover assembly comprising a rollable curtain (1) having a plurality of transverse adjacent panels (2) hingedly linked to one another; a pair of side rails (3, 4) adapted to be mounted on upper portions of the side walls of the truck bed for guiding the end portions of the transverse adjacent panels (2) and a housing box (5) adapted for receiving and storing the rollable curtain (1), wherein the housing box (5) comprises a transverse rotatable shaft (6) mounted therein, one or more sleeve elements (7, 8) mounted on said transverse rotatable shaft (6), one or more collapsible curtain engaging means (9, 10) each mounted to said one or more sleeve elements (7, 8), respectively, and designed to engage an inner end of the rollable curtain (1), and side walls (11, 12), each having inwardly extending continuous helical trackways defining a rolling path.

Process for preparing an aqueous mould release agent to be used in the manufacture of moulded polyurethane articles, which comprises first preparing an emulsion comprising a release active substance, water, an emulsifying agent and, optionally, a hydrocarbon, and then twofold homogenizing the emulsion. Using this process, a water-based mould release agent is obtained which provides the same demoulding performance than conventional solvent-based release agents. The disclosure also relates to the release agent obtainable with such process, to its use for preparing moulded polyurethane articles and to a process for preparing moulded polyurethane using this release agent.

The present invention provides a device for dispensing a tissue adhesive, said device comprising an outer body made of a flexible material, a monomeric and/or polymeric composition arranged inside said outer body, an applicator tip removably attached to said outer body and at least one porous element comprised inside the applicator tip and having an activator solution arranged thereon and/or therein. The present invention also provides a method for activating electron-deficient olefin monomers, such as methylene malonate monomers. The method comprises providing a monomer formulation comprising at least one electron-deficient olefin monomer; providing at least one porous element having an activator solution therein; and forcing, at least once, the monomer formulation through the at least one porous element to contact the activator solution.

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