Abstract: A non-linear optical device includes a frequency-conversion waveguide and first and second input waveguides. The longitudinal axes of the input waveguides are inclined to that of the frequency-conversion waveguide such a first transverse mode is excited in the latter at the input frequency in operation of the device. The frequency-conversion waveguide supports a second transverse mode at an output frequency of the device, such that the phase velocity of the second transverse mode at the output frequency is substantially equal to that of the first transverse mode at the input frequency, thus providing phase-matching by balancing the effects of chromatic and modal dispersion.

Abstract: A system and method for preventing stubble damage to agricultural implement tires is disclosed. The system can comprise a plurality of drag chains mounted in advance of tires traversing a field. The drag chains may be disposed by a plurality of hanging support chains to suspend the drag chains. The system may also comprise a plurality of chain assemblies separating the hanging chains and at least one mounting bracket, wherein the chain assembly is mounted to the agricultural implement so as to suspend the support chains and drag chains ahead of the front wheels of the implement.

Abstract: A switching regulator (2-5) supplies a controllable stable average current to a load (1), such as series-connected light emitting diodes. A regulator controller (2) includes a hysteretic comparator (12, 30) which controls a switch in the form of a transistor (15) for switching current into an inductor (3). The comparator (12) has upper and lower thresholds. A first circuit comprising a fast current monitor (6) supplies a first signal to the comparator representing the instantaneous current in the inductor (3). A second circuit (36, 37, 41, and 42) supplies a second signal to the comparator representing an error between a desired regulator output and an actual regulator output.

Abstract: A radial tire is provided for use with off-the-road (OTR) vehicles. The tire includes multiple beads, a nylon carcass and multiple nylon plies. The construction prevents slipping and rocking, and zipper-type failures. The tire also has improved lateral stability under load.

Abstract: Apparatus comprising an optical fiber laser having at least two laser cores and means arranged to combine laser output from the at least two laser cores at a first end of the optical fiber laser to produce a combined laser output having one or more beat signals.

Abstract: A non-linear optical device includes a frequency-conversion waveguide and first and second input waveguides. The longitudinal axes of the input waveguides are inclined to that of the frequency-conversion waveguide such a first transverse mode is excited in the latter at the input frequency in operation of the device. The frequency-conversion waveguide supports a second transverse mode at an output frequency of the device, such that the phase velocity of the second transverse mode at the output frequency is substantially equal to that of the first transverse mode at the input frequency, thus providing phase-matching by balancing the effects of chromatic and modal dispersion.

Abstract: Apparatus comprising an optical fibre laser having at least two laser cores and means arranged to combine laser output from the at least two laser cores at a first end of the optical fibre laser to produce a combined laser output having one or more beat signals.

Abstract: A switching regulator (2-5) supplies a controllable stable average current to a load (1), such as series-connected light emitting diodes. A regulator controller (2) includes a hysteretic comparator (12, 30) which controls a switch in the form of a transistor (15) for switching current into an inductor (3). The comparator (12) has upper and lower thresholds. A first circuit comprising a fast current monitor (6) supplies a first signal to the comparator representing the instantaneous current in the inductor (3). A second circuit (36, 37, 41, and 42) supplies a second signal to the comparator representing an error between a desired regulator output and an actual regulator output.

Abstract: A radial tire is provided for use with off-the-road (OTR) vehicles. The tire includes steel belts with organic belts or an organic carcass.

Abstract: A radial tire is provided for use with off-the-road (OTR) vehicles. The tire includes multiple beads, a nylon carcass and multiple nylon plies. The construction prevents slipping and rocking, and zipper-type failures. The tire also has improved lateral stability under load.