A method of fabricating a porous metal structure of a molten liquid metal within a casting chamber to form a porous solid structure upon controlled chamber cooling and depressurization. First, a metal layer is formed, which serves as ribs and a gate layer. In other embodiments, the suturing instruments are capable of housing multiple needle and suture assemblies andor reloading the needle and suture assembly without removing the instrument from the surgical site. 005 m, and an alumina film of corundum crystal structure formed on one of surfaces of the oxide film. The hydraulic mounding zone and the mixing zone increase the density of the fresh water for offsetting saltwater from the saltwater body. The data classification module is configured provide the retrieved information to a requester of the information.