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The underwater glider has difficulty accessing the complex and narrow hadal trench for observation, which is affected by its limited regulation capability of pitch angle (?45°~45°). In this study, a compact attitude regulating mechanism proposed to extend range from ?90°to 90° install it on hadal-class Petrel-XPLUS. Subsequently, dynamics model Petrel-XPLUS established using dual quaternions so...

We conducted a capture-recapture study on the population size and trends of the Ashy Storm-petrel (Oceanodroma homochroa) on Southeast Farallon Island (SEFI), California, based upon data collected in 1971, 1972, and 1992. From March through August, birds were lured to fixed-site sampling locations using taped vocalization playback. Using program JOLLY, we estimated population size and evaluated...