Abstract: An all-glass optical atom-chamber with a vacuum higher than 1×10?8 Pa and a manufacturing method thereof are provided. The all-glass optical atom-chamber includes an optical vacuum chamber, at least one conduit, optical window sheets, at least one vacuum adapter, and pressing sheets. The optical vacuum chamber is a polyhedron with a plane of any shape; the plane of the polyhedron is provided with an optical window therein. Holes of the optical windows extending into the polyhedron form a same inner chamber. Each of the optical window sheets is fixed on respective optical windows. One end of each of the at least one conduit is fixedly connected to the optical vacuum chamber. The other end of the at least one conduit is connected to one end of the at least one vacuum adapter in one-to-one correspondence through a respective pressing sheet of the pressing sheets.

Abstract: The disclosure demonstrates a collapsible wheeled walker having two side frames supported above a walking surface with attached wheel assemblies. The side frames are interconnected by an X-folder apparatus. The X-folder apparatus has first and second elongate elements rotatably coupled to each other with the bottom ends of the elements rotatably attached to the bottoms of the side frames, and the top ends of the elements having perpendicular support elements that in the deployed open position, engage support brackets formed on the inner sides of the side frames. The support brackets have protrusions extending from bracket support surfaces to engage complementary apertures formed in the perpendicular support elements to provide stability to the wheeled walker.

Abstract: An article of manufacture comprising: (a) a body at least a portion of which is a multi-phase material (MPM) defining a traction surface; (b) the MPM comprising at least first and second zones comprising first and second materials, M1, M2, respectively, at or near the traction surface, the M1 and M2 having first and second Young moduli respectively, the first and second moduli differing by at least a factor of 3; and (c) wherein each of the second zones has a center, and wherein the second zones have a center-to-center radial distribution function having a peak at between 10 ?m and 10 mm.

Abstract: The disclosure demonstrates a collapsible wheeled walker having two side frames supported above a walking surface with attached wheel assemblies. The side frames are interconnected by an X-folder apparatus. The X-folder apparatus has first and second elongate elements rotatably coupled to each other with the bottom ends of the elements rotatably attached to the bottoms of the side frames, and the top ends of the elements having perpendicular support elements that in the deployed open position, engage support brackets formed on the inner sides of the side frames. The support brackets have protrusions extending from bracket support surfaces to engage complementary apertures formed in the perpendicular support elements to provide stability to the wheeled walker.

Abstract: The disclosure demonstrates a collapsible wheeled walker having two side frames supported above a walking surface with attached wheel assemblies. The side frames are interconnected by an X-folder apparatus. The X-folder apparatus has first and second elongate elements rotatably coupled to each other with the bottom ends of the elements rotatably attached to the bottoms of the side frames, and the top ends of the elements having perpendicular support elements that in the deployed open position, engage support brackets formed on the inner sides of the side frames. The support brackets have protrusions extending from bracket support surfaces to engage complementary apertures formed in the perpendicular support elements to provide stability to the wheeled walker.