Abstract: A photocatalytic metal deposition process and a resulting nanocomposite are described. The nanocomposite includes an electrically conducting carbonaceous material, a photoactive metal oxide and a metal. Metals for deposition include noble metals, metal alloys and other transition metals in which the metal is laid down precisely and in a predetermined fashion on one or more surfaces of a composite. Deposition provides a high performance electrocatalyst for a number of suitable applications.

Abstract: A connecting structure for T-square including a raised connecting section provided at an upper middle position of a crosspiece of the T-square, and a recessed fixing section correspondingly provided at a lower front end of a straight rule of the T-square for detachably receiving the raised connecting section therein. Therefore, the crosspiece and the straight rule of the T-square may be easily assembled to and disassembled from each other. And, the disassembled T-square may be conveniently carried or stored.

Abstract: A protractor for teaching aid includes a semicircular disk being provided along a curved section with angle marks and along a straight edge with length marks to form a main body of the protractor, and at a center with a locating hole or a locating bar; and at least one indicating strip being provided at two ends at one side with a short bar each, with a receiving hole correspondingly formed behind each short bar, and on one surface along a centerline with a central marker. The indicating strips may be rotatably connected at the short bars or the receiving holes to the locating hole or the locating bar, respectively, or rotatably connected end to end to form a polygon, so that the protractor has not only the function of measuring an angle, but also many other teaching functions.