The White House today holds 142 rooms on six floors, the floor space totaling approximately 55,000 square feet. It has hosted longstanding traditions such as the annual Easter Egg Roll, as well as historic events like the 1987 nuclear arms treaty with Russia.
This parameterization is based on the topological definition of a MÃ¶bius strip as the rotation of a line segment around a circle, with half twist. a is the radius of the circle about which the line is rotated, u is the angular position around the circle of the segment, and v is the position along the horizontal line.
1. Schematic of the gridded lens in a pipe used for ray-tracing simulations. 2.1 Gridded lens with rings at the same potential as the grid. (Unipotential lens) The symmetrical rings on the periphery of the grid are needed for the grid mount and can be. used for the modification of the electrostatic field in this region. the equipotentials on the radial periphery less steep) by extending these rings in axial direction. ConFlat vacuum flange for use in a 6â vacuum pipe. The optical simulations have been done for dimensions of the lens indicated in Fig.