Abstract: A temporary step and support assembly includes two primary portions: an attachment member and a horizontal surface member. The attachment member preferably includes three sides for engaging a board or other fixed support, wherein the first side and the third side are disposed in parallel relation, and the second side is preferably angled upwardly from the first side to the third side. The horizontal support member, extends from the first side of the attachment member, and serves as a temporary step, so that a user may attach the temporary step and support assembly to a board or other fixed support for standing or climbing to reach a greater height in an upward direction. Optionally, the horizontal support member may be angularly adjustable with respect to the attachment member for use on angled fixed support studs, boards or framing.

Abstract: A temporary step and support assembly includes two primary portions: an attachment member and a horizontal surface member. The attachment member preferably includes three sides for engaging a board or other fixed support, wherein the first side and the third side are disposed in parallel relation, and the second side is preferably angled upwardly from the first side to the third side. The horizontal support member, extends from the first side of the attachment member, and serves as a temporary step, so that a user may attach the temporary step and support assembly to a board or other fixed support for standing or climbing to reach a greater height in an upward direction. Optionally, the horizontal support member may be angularly adjustable with respect to the attachment member for use on angled fixed support studs, boards or framing.

Abstract: A temporary step and support assembly includes two primary portions: an attachment member and a horizontal surface member. The attachment member preferably includes three sides for engaging a board or other fixed support, wherein the first side and the third side are disposed in parallel relation, and the second side is preferably angled upwardly from the first side to the third side. The horizontal support member, extends from the first side of the attachment member, and serves as a temporary step, so that a user may attach the temporary step and support assembly to a board or other fixed support for standing or climbing to reach a greater height in an upward direction. Optionally, the horizontal support member may be angularly adjustable with respect to the attachment member for use on angled fixed support studs, boards or framing.

Abstract: An exemplary embodiment of the present invention provides an interference projection exposure system comprising a beam-providing subsystem and an objective lens subsystem that can provide a plurality of light beams which intersect and interfere at an image plane to produce a high spatial frequency periodic optical-intensity distribution. The interference projection system can further comprise a pattern mask that can alter the periodic optical-intensity distribution so as to incorporate functional elements within the periodic optical-intensity distribution. The beam providing subsystem can comprise a beam generating subsystem, a beam conditioning subsystem and a beam directing subsystem. Another exemplary embodiment of the present invention provides for a method of producing a high spatial frequency periodic optical-intensity distribution using a interference projection exposure system.

Abstract: An exemplary embodiment of the present invention provides an interference projection exposure system comprising a beam-providing subsystem and an objective lens subsystem that can provide a plurality of light beams which intersect and interfere at an image plane to produce a high spatial frequency periodic optical-intensity distribution. The interference projection system can further comprise a pattern mask that can alter the periodic optical-intensity distribution so as to incorporate functional elements within the periodic optical-intensity distribution. The beam providing subsystem can comprise a beam generating subsystem, a beam conditioning subsystem and a beam directing subsystem. Another exemplary embodiment of the present invention provides for a method of producing a high spatial frequency periodic optical-intensity distribution using a interference projection exposure system.

Abstract: An exemplary embodiment of the present invention provides a diffractive photo-mask comprising a body element, a plurality of interference/image-forming hologram gratings, and a zero-order beam blocking element. The plurality of interference/image-forming hologram gratings can be located on or in the body element. The plurality of interference/image-forming hologram gratings are configured to diffract a light beam to produce one or more functional elements surrounded by a high-spatial-frequency periodic optical-intensity distribution at a substrate plane when the light beam is incident upon the diffractive photo-mask.

Abstract: A boat plug has external threads that mate with a boat hole housing, and an end keyed to operate the plug. In preferred embodiments the key has a first end portion that mates with the plug, and a second end portion that mates with a driver. The first end portion, and the corresponding recess in the plug, can advantageously have depths of no more than 1 cm, and more preferably no more than 5 mm. In other aspects of preferred embodiments, the first end portion comprises a recess having irregularities, and independently the second end portion comprises a nut.

Abstract: Disclosed are a method and system for providing improved aeration of a fluid that is propelled though a pump to efficiently transfer oxygen and other gasses to a liquid body. In addition to the aeration, circulation of the liquid body may be performed to provide additional efficiency and benefit to the fluid system. In one embodiment, the apparatus performs efficient aeration by utilizing a venturi effect on the submerged intake manifold of a floating centrifugal pump. The aerated fluid is then directed to circulate the aerated liquid to a portion of the fluid body that is in greatest need of the gas that is being mixed with the fluid.