Abstract: A pumping apparatus for harvesting the wave energy and converting such energy into hydraulic power which may be transmitted and used to generate electricity or to produce desalinated water. The pumping apparatus has a float, an accumulator pressurized above the ambient pressure of the pump, the accumulator is charged with fluid and the pump is full of fluid. A check valve is closed and a pumping chamber is pressurized. An additional pumping chamber is also equally pressurized. An axial force is generated on a first tube by the pressure difference between its ends. An opposite axial force is generated on a second tube by the pressure difference between its ends. The second tube is larger in diameter than the first tube and hence the magnitude of the force on the second tube is greater. The resultant of these forces is balanced by a portion of the buoyancy of float.

Abstract: A pumping apparatus designed for the purpose of economically harvesting the energy of the waves on the surface of a body of water and converting such energy into hydraulic power which may be transmitted by pipes and used for any purpose but preferably for the generation of electricity or the production of desalinated water. To better explain the means of operation of this invention, referring to FIG. 1 will start by assuming that the float (14) is static, the accumulator (30) is pressurized above the ambient pressure of the environment of pump, the accumulator(30) is charged with fluid and the pump is full of fluid. In this condition check valve (10) is closed and pumping chamber (19) is pressurized by the accumulator (30). Pumping chamber (18) is also equally pressurized via the piston (2). An axial force is generated on rod or tube (3) by the pressure difference between its ends. A similar, but opposite, axial force is generated on rod or tube (4) by the pressure difference between its ends.

Abstract: A method for increasing the rate of shear rehealing of fluids made with cationic, zwitterionic, and amphoteric viscoelastic surfactant fluid systems by adding an effective amount of a rheology enhancer package containing, for example a polyethylene glycol-polypropylene glycol block copolymer and a polynaphthalene sulfonate. The rheology enhancer package allows viscoelastic surfactant fluids to be used at lower viscoelastic surfactant concentrations in certain applications, for example certain oilfield treatments, for example fracturing and gravel packing. Preferred surfactants are betaines and quaternary amines.

Abstract: A method for increasing the rate of shear rehealing of fluids made with cationic, zwitterionic, and amphoteric viscoelastic surfactant fluid systems by adding an effective amount of a rheology enhancer package containing, for example a polyethylene glycol—polypropylene glycol block copolymer and a polynaphthalene sulfonate. The rheology enhancer package allows viscoelastic surfactant fluids to be used at lower viscoelastic surfactant concentrations in certain non-oilfield excavation applications, for example boring, excavating, drilling and trenching operations in deep foundation construction, subterranean construction, and tunneling. Preferred surfactants are betaines and quaternary amines.

Abstract: A method for increasing the rate of shear rehealing of fluids made with cationic, zwitterionic, and amphoteric viscoelastic surfactant fluid systems by adding an effective amount of a rheology enhancer package containing, for example a polyethylene glycol-polypropylene glycol block copolymer and a polynaphthalene sulfonate. The rheology enhancer package allows viscoelastic surfactant fluids to be used at lower viscoelastic surfactant concentrations in certain applications, for example certain oilfield treatments, for example fracturing and gravel packing. Preferred surfactants are betaines and quaternary amines.

Abstract: The invention relates to the use, in emulsion polymerization, of at least a compound derived from a terpene and comprising a number of oxypropylene units ranging between 0 to 20, and a number of oxyethylene units ranging between 2 to 80.

Abstract: A fluorescent lamp (10) is located within a coloured sleeve (12), the body of the latter being made of translucent material. A drive cap (14) of the sleeve (12) is driven by a belt (16), movement of which causes rotation of the sleeve over the fluorescent lamp (10).