Shallow-water late middle Eocene crinoids from Tierra del Fuego: a new southern record of a retrograde community structure

click here One of the very few crinoid records in Patagonia is that of the abundant columnals of the genus Isselicrinus found in several localities in shallow marine, glauconitic sandstones of the Leticia Formation (upper middle Eocene of Tierra del Fuego Island).Some of them, up to 10 cm long, are preserved in a position almost perpendicular to th

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Buffer Compliance Control of Space Robots Capturing a Non-Cooperative Spacecraft Based on Reinforcement Learning

Aiming at addressing the problem that the joints are easily destroyed by the impact torque during the process of space robot on-orbit capturing a non-cooperative spacecraft, a reinforcement learning control algorithm combined with ventilationstejp a compliant mechanism is proposed to achieve buffer compliance control.The compliant mechanism can not

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