Abstract: Hydraulic binder reducing formulation, agent or additive for cementitious compositions, cementitious compositions containing same, and method of preparing the same. The binder reducing formulation comprises carbon nanotubes, preferably functionalized carbon nanotubes, most preferably carboxylic acid functionalized multi-wall carbon nanotubes. The binder reducing formulation may also comprise one or more of silane, glycerol, nanosilica and a surfactant. The cementitious compositions including the binder reducing formulation achieve strength values equal to or greater than strength values achieved with similar or identical cementitious compositions but devoid of the binder reducing composition.

Abstract: A pipe jacket is disclosed for use with pipes such as hydrocarbon based liquid and gaseous high pressure oil pipelines. The pipe jacket exhibits ballistic self-sealing properties through the use of ballistic fabric surrounding a self-sealing core. The self-sealing core makes use of compressible polymers, which close back on themselves when a foreign object such as a bullet passes through to prevent most leakage, and a self-sealing fluid to fill in whatever space remains. The compressible polymers are kept under a pressure greater than the internal pipeline normal maximum operating pressure by a fastening system which securely fastens one end of the pipe jacket to the other after the pipe jacket is placed around the outside of the pipe. The pipe jacket may also optionally provide additional protection from blasts, electric drill sabotage, corrosion, and thermal variation.

Abstract: The present invention provides_a power converter that can be used to interface a generator (4) that provides variable voltage at variable frequency to a supply network operating at nominally fixed voltage and nominally fixed frequency and including features that allow the power converter to remain connected to the supply network and retain control during supply network fault and transient conditions. The power converter includes a generator bridge (10) electrically connected to the stator of the generator (4) and a network bridge (14). A dc link (12) is connected between the generator bridge (10) and the network bridge (14). A filter (16) having network terminals is connected between the network bridge (14) and the supply network. A first controller (18) is provided for controlling the operation of the semiconductor power switching devices of the generator bridge (14).

Abstract: The present invention provides a power converter that can be used to interface a generator that provides variable voltage at variable frequency to a supply network operating at nominally fixed voltage and nominally fixed frequency and including features that allow the power converter to remain connected to the supply network and retain control during supply network fault and transient conditions. The power converter includes a generator bridge electrically connected to the stator of the generator and a network bridge. A dc link is connected between the generator bridge and the network bridge. A filter having network terminals is connected between the network bridge and the supply network. A first controller is provided for controlling the operation of the semiconductor power switching devices of the generator bridge. Similarly, a second controller is provided for controlling the operation of the semiconductor power switching devices of the network bridge.