Abstract: A system for controlling a drill string located in a borehole. The drill string has a top portion and a bottom hole assembly (BHA) coupled thereto. The system includes: a processor; sensors coupled to the top portion of the drill string and to the processor. The sensors configured to measure values of variables of the top portion of the drill string, to obtain top portion measured value. A non-transitory tangible computer readable medium having instructions recorded thereon are carried out by the processor to obtain a soft sensor to generate estimated values of variables of the BHA in accordance with the top portion measured values and in accordance with angular motion equations of the drill string. A drill string controller is configured to generate a control signal in accordance with the estimated values of variables of the BHA to control the top portion in accordance with the control signal.

Abstract: A biosensor device (10) for in situ monitoring of deep-water sea-floor biological patterns (30), which biosensor platform (10) comprises a plurality of cameras (12) and a lightening system (14), wherein a plurality of coral nubbins (16) with a plurality of polyps (18) are prepared and fixed to a platform (11) of the biosensor platform (10) with a distance to each other such that there is no overlap on a picture frame (22) thereof, and wherein the cameras (12) and the lightening system (14) are arranged so as to take coral-silhouette-pictures (CSP:s) of the plurality of nubbins (16) in the picture frame (22). In this way, there is provided a biosensor device based on coral, or other deep-sea species, behavioural for surveillance and monitoring of a deep-water sea-floor.