Abstract: An internal solitary wave (ISW) early warning method for an offshore platform based on a baroclinic mode includes the following steps: S1: providing a hydrophone and a bottom-founded transmitting transducer in a sea area of an offshore platform, and acquiring an actually measured sound pressure; S2: solving a hydrodynamic equation to obtain a baroclinic mode of the sea area of the offshore platform; S3: constructing a seawater sound velocity equation according to the baroclinic mode; S4: transforming the seawater sound velocity equation to obtain a relational expression between an amplitude of the baroclinic mode and a seawater sound velocity; S5: solving, according to the actually measured sound pressure, and the relational expression between the amplitude of the baroclinic mode and the seawater sound velocity, the amplitude of the baroclinic mode with a genetic algorithm (GA); and S6: performing monitoring and early warning on an ISW.

Abstract: An internal solitary wave (ISW) early warning method for an offshore platform based on a baroclinic mode includes the following steps: S1: providing a hydrophone and a bottom-founded transmitting transducer in a sea area of an offshore platform, and acquiring an actually measured sound pressure; S2: solving a hydrodynamic equation to obtain a baroclinic mode of the sea area of the offshore platform; S3: constructing a seawater sound velocity equation according to the baroclinic mode; S4: transforming the seawater sound velocity equation to obtain a relational expression between an amplitude of the baroclinic mode and a seawater sound velocity; S5: solving, according to the actually measured sound pressure, and the relational expression between the amplitude of the baroclinic mode and the seawater sound velocity, the amplitude of the baroclinic mode with a genetic algorithm (GA); and S6: performing monitoring and early warning on an ISW.

Abstract: Methods and devices are disclosed for tracking site-specific microstructure evolutions and local mechanical fields in metallic samples deformed along biaxial strain paths. The method is based on interrupted bulge tests carried out with a custom sample holder adapted for SEM-based analytical measurements. Embodiments include elliptical dies used to generate proportional and complex strain paths in material samples. One example holding device includes a base having a floor and walls that extend to form a chamber for a sample, the floor having apertures for receiving a pressure-supplying fluid, a cover having an opening and configured such that the cover and base can be coupled together to tightly clamp a sample in the chamber, and washers disposed between the base and the cover, each washer having openings extending therethrough change at least one of a shape and a size of the opening formed in the cover.

Abstract: Methods and devices are disclosed for tracking site-specific microstructure evolutions and local mechanical fields in metallic samples deformed along biaxial strain paths. The method is based on interrupted bulge tests carried out with a custom sample holder adapted for SEM-based analytical measurements. Embodiments include elliptical dies used to generate proportional and complex strain paths in material samples. One example holding device includes a base having a floor and walls that extend to form a chamber for a sample, the floor having apertures for receiving a pressure-supplying fluid, a cover having an opening and configured such that the cover and base can be coupled together to tightly clamp a sample in the chamber, and washers disposed between the base and the cover, each washer having openings extending therethrough change at least one of a shape and a size of the opening formed in the cover.