Abstract: A pressure relief device includes a main body and at least two air control units. The main body has at least one passage therein and two outlets formed at upper and lower ends of the passage. A lid is pivotally connected to each of the outlets. The two air control units are each disposed in the passage close to the lid. An air control device drives the air control units to open/close the lid which is adapted to open/close the passage.

Abstract: A modified layered material is provided, which includes a layered inorganic material intercalated with an organic modifier. The organic modifier includes wherein M includes a metal and R1 includes a carbon chain. An unsaturated polyester nanocomposite is also provided, which includes a polymer material including unsaturated polyester and the modified layered material, wherein the modified layered material is dispersed in the polymer material and is at least partially exfoliated.

Abstract: Advanced foil design method and structure for multi speeds mainly adds a constraint according to a needed pressure distribution of the advanced foil after building an advanced foil environment. Thence, a step of optimization could be applied for analyzing the advanced foil by flow characteristics to achieve a shaped profile, so that a weight calculation weighted calculation would be further operated base on a proportion of the advanced coil applied to multi speeds. Accordingly, a preferable profile of the advanced foil and the environment parameter combination can be obtained to enhance a higher operative efficiency with the preferred benefit of the Supercavitating propeller while applied to a higher speed and with the profit of a stable competence while applied to a lower speed.

Abstract: A modified layered material is provided, which includes a layered inorganic material intercalated with an organic modifier. The organic modifier includes wherein M includes a metal, R1 and R2 are independent and each includes a carbon chain, and X?includes an anion. An unsaturated polyester nanocomposite is also provided, which includes a polymer material including an unsaturated polyester and the modified layered material, wherein the modified layered material is dispersed in the polymer material and is at least partially exfoliated.