A DC to AC converter is described in which DC power presented as a set of relatively floating DC power sources of differing DC voltage values is converted to a desired AC power waveform by combining the DC voltage values with sequential sets of associated ternary-valued multiplicative weights of +1, 1, or 0, and summing the weighted voltage values, so as to produce voltage points on the desired waveform at appropriate time instants.

A method of controlling pitch of individual blades in a wind turbine is described, together with a suitable controller. Wind speed is determined as a function of azimuthal angle. Wind speed is then predicted for individual blades over a prediction horizon using this determination of wind speed as a function of azimuthal angle. The predicted wind speed for each individual blade is used in a performance function, which is optimized to control individual blade pitches.

The present invention refers to a new concrete composition comprising fiberglass waste and an air-entraining additive. The concrete presents a thermo-insulating performance far superior to conventionally produced concretes. The present invention is mainly intended for the construction industry, in non-structural applications for thermal insulation. The use of fiberglass waste reduces the consumption of natural aggregates and allows for the use of waste which is expense to dispose of.

A marine distribution vessel includes a barge that fuel tanks and lubricant tanks, and a distribution station disposed on the barge and connected with the fuel tanks and the lubricant tanks. The distribution station includes a fuel pump and a fuel line that connects the fuel tanks with the fuel pump, a lubricant pump and lubricant lines that connect the lubricant tanks with the lubricant pump, a fuel flow meter disposed in the fuel line, an automated fuel valve disposed in the fuel line, a lubricant flow meter disposed in the lubricant lines, automated lubricant valves disposed in the lubricant lines, and a computerized controller electrically connected with the fuel flow meter, the lubricant flow meter, the automated fuel valve, the automated lubricant valves, the fuel pump, and the lubricant pump.

The present disclosure relates to a houseboat assembly formed from a cabin assembly secured to a hull assembly. In some version of the houseboat assembly, one or both of the cabin assembly and the hull assembly may be formed in accordance with a boat type and/or a floor plan. The boat type and/or floor plan may be selected by a customer. The cabin assembly may be formed at a first location and the hull assembly may be formed at a second location. The cabin assembly and hull assembly may then be transported to a third location. At the third location, the cabin assembly may be secured to the hull assembly to form the cabin assembly at the third location. The third location may be requested or specified by the customer.

A structure comprises at least one outer wall having an internal wall section and an outer wall section with an air flow passage therebetween. A circulation system circulates air through the flow passage to inhibit moisture accumulation and mold growth. A sensing system determines the presence of moisture in the flow passage and generates a signal in response thereto. A controller receives the signal from the sensing system and controls the circulation system to maintain a predetermined temperature and relative humidity in the flow passage.

The present disclosure relates to a houseboat assembly formed from a cabin assembly secured to a hull assembly. In some version of the houseboat assembly, the hull assembly may include a runoff flange. The runoff flange may include an inner flange, an outer flange, and a riser extending between the inner flange and the outer flange. The outer flange may extend along an imaginary longitudinal outer flange axis and the riser may extend along an imaginary longitudinal riser axis whereby the riser axis intersects the outer flange axis at an angle. In some versions of the houseboat assembly, the angle is an acute angle. More specifically, the angle may be between thirty and sixty degrees. In some versions of the houseboat assembly, the cabin assembly is secured to the inner flange of the runoff flange. Cross-members and deck boards may be secured to a roof of the cabin assembly.

An exterior insulation panel for installation in an exterior building envelope of a building. The insulation panel has an interior face for facing toward an interior space of the building, an exterior face lying opposite the interior face for facing away from the interior space of the building, and a foam core laminated with a perforated exterior facer on one or both faces of the panel, at which the exterior facer defines an uncovered outermost layer of the panel. Each perforated facer comprises openings therein through which moisture is migratable into the foam core during moisture-rich environmental conditions, for temporary holding of the excess moisture until such conditions subside.

A method for the maintenance of a first wind energy installation from a group of wind energy installations. In the method, a future maintenance time period is identified in which a boost power of the group of wind energy installations is greater than a prescribed threshold value, wherein the boost power results from a wind speed predicted for the future maintenance time period, said wind speed being greater than a rated wind speed. The power of the first wind energy installation is reduced after the start of the maintenance time period and a boost power is drawn from a plurality of wind energy installations from the group of wind energy installations. A maintenance process is carried out at the first wind energy installation. The invention furthermore relates to a control unit suitable for carrying out the method.

Portable, collapsible, lightweight housing structure for outdoors, and a method of assembling, and using the same. The invention encompasses an apparatus for providing shelter for humans and animals, which is portable, collapsible, and easily transportable from location to location, and can be quickly assembled, and disassembled. The apparatus comprises of a tubular frame, where a flat housing panel is wrapped around the tubular frame, and a cover is secured to the top of the assembly to from the portable, collapsible, lightweight housing structure or the quick assembly hunting blind or hunting blind kit. The portable, collapsible apparatus, has a ceiling or roof, and wall or panels that are made of one or more layers of material, such as, corrugated material, plastic material, composite material, waterproof material, weatherproof material, rigid honeycomb board material, polyethylene material, polypropylene material. The inventive apparatus could also have an attachable or detachable base or floor.