Abstract: A system for determining polarization profiles of points in a scene from video frames using Stokes parameters includes a scene having a region that emits scene light rays that correspond to the points in the scene, an optical chopper controller, a rotating Stokes filter wheel that includes five trigger holes, three rotating linear polarizers, a circular polarizer, and a reference screen, a color filter, a video camera having a video frame, and a computer system having a frame grabber apparatus. The scene light rays are transmitted through the Stokes filter and the color filter to the video camera.

Abstract: A geodesic dome is created by the steps of: (a) generating a mathematical model of a geodesic dome, (b) fabricating components with which to form a geodesic dome according to the model; and (c) fastening the components to each other according to the model. In the model, M base triangles are generated in a closed three-dimensional shape. M is at, least four, with eight being preferred and the preferred closed three-dimensional shape being a regular octahedron. The closed three-dimensional shape has a center point from which each vertex of each of the base triangles is equidistant, this distance being a geodesic radius. Each leg of each base triangle is then subdivided into N segments of equal length, N being at least two, with eight being preferred, thus defining N+1 segment endpoints or intersections along each leg. A line is then generated between each intersection and two corresponding intersections, thus defining N2 smaller triangles per base triangle.

Abstract: A door construction with an improved locking channel assembly has a pair of doors with vertical edges pivotally hinged to a frame and opposing closing edges including an improved interlocking locking channel assembly. The interlocking assembly has first and second elongated locking channel elements lying within the plane of the doors. The locking channel elements extend substantially the height of, and are pivotally attached along respective vertical axis of an associated edge of a door. One locking channel element carries an adjustable elongated tongue. The other elongated locking channel element is adapted to receive the protruding portion of the tongue in interlocking relationship.