A device (110) for performing measurements on a seabed (3), comprises a chamber (111) containing a sensor (120) and a fluid (115) at a constant temperature and at an ambient pressure. This removes the need for calibration in large ranges of both pressure and temperature. In addition, this eliminates the need to wait until the sensor (120) has achieved ambient temperature, and thereby achieves a desired accuracy of the recordings from the sensor while decreasing the operation time. The device preferably comprises an insulating layer (113), an internal temperature stabilising device (130) and a circulating device (131) to ensure a constant temperature and low temperature gradients within the chamber (111). The pressure within chamber (111) may be equalised to ambient pressure by a pressure inlet (112).

A system for adjusting the firmness of a substrate configured to support a subject includes a first rod configured to be movable by a mechanism, a second rod parallel to and spaced from the first rod a distance that spans a majority of a dimension of the substrate, and flexible straps extending between the first rod and the second rod and attached to the first rod and the second rod at respective ends of each flexible strap. The mechanism is configured to move the first rod in a first direction to increase tension on the flexible straps and move the first rod in a second direction to decrease tension on the flexible straps. The mechanism can be manually operated by the subject or can be a motor that is controlled by a controller.

An interactive electronic apparatus and an interactive method thereof are provided. The interactive electronic apparatus includes a main device and a casing. The main device is installed in a containing space of the casing. After the main device establishes a connection with the casing, the casing sends at least one of a first distance between the casing and an object to be sensed by a first distance sensor and a second distance between a bottom portion of the casing and a plane detected by a second distance sensor to the main device. The main device determines an interactive state of interaction with the interactive electronic apparatus based on at least one of a movement information sensed by a gravity sensor, the first distance and the second distance, and sends an interactive signal corresponding to the interactive state.

Devices and methods for generating synthetic cardio-respiratory signals from one or more ballistocardiogram (BCG) sensors. A method for determining item specific parameters includes obtaining ballistocardiogram (BCG) data from one or more sensors, where the one or more sensors capture BCG data for one or more subjects in relation to a substrate. For each subject, the captured BCG data is pre-processed to obtain cardio-respiratory BCG data. The cardio-respiratory BCG data is sub-sampled to generate the cardio-respiratory BCG data at a cardio-respiratory sampling rate conducive to cardio-respiratory signal generation. The sub-sampled cardio-respiratory BCG data is cardio-respiratory processed to generate a cardio-respiratory parameter set. A synthetic cardio-respiratory signal is generated from at least the cardio-respiratory parameter set and a cardio-respiratory event morphology template. A condition of the subject is determined based on the synthetic cardio-respiratory signal.

Atom-scale particles, e.g., neutral and charged atoms and molecules, are pre-cooled, e.g., using magneto-optical traps (MOTs), to below 100 K to yield cold particles. The cold particles are transported to an atom-chip cell which cools the cold particles to below 1 K; these particles are stored in a reservoir within the atom-chip cell so that they are readily available to replenish a sensor population of particles in quantum superposition. A baffle is disposed between the MOTs and the atom-chip cell to prevent near-resonant light leaking from the MOTs from entering the atom-chip cell (and exciting the ultra-cold particles in the reservoir). The transporting from the MOTs to the atom-chip cell is effected by moving optical fringes of optical lattices and guiding the cold particles attached to the fringes along a meandering path through the baffle and into the atom-chip cell.

The present application relates sensing reactive components in fluids by monitoring band gap changes to a material having interacted with the reactive components via physisorption and/or chemisorption. In some embodiments, the sensors of the present disclosure include the material as a reactive surface on a substrate. The band gap changes may be detected by measuring conductance changes and/or spectroscopic changes. In some instances, the sensing may occur downhole during one or more wellbore operations like drilling, hydraulic fracturing, and producing hydrocarbons.

An apparatus is directed relative to geomagnetic and gravitational fields of reference while advancing with rotation in a borehole by determining angular position of the apparatus during the rotation and correcting the angular position of the apparatus relative to an offset of a toolface of the apparatus. To do the correction, a magnetic toolface of the apparatus during the rotation is determined based on geomagnetic readings of the apparatus in each of a plurality of divisions of the rotation relative to the geomagnetic field, and a gravitational toolface of the apparatus during the rotation is determined based on gravitational readings of the apparatus in each of the divisions of the rotation relative to the gravitational field. The offset of the toolface is then calculated as a difference between the magnetic toolface and the gravitational toolface. The corrected angular position can then be used in directing the apparatus.

An apparatus is directed relative to geomagnetic and gravitational fields of reference while advancing with rotation in a borehole by determining angular position of the apparatus during the rotation and correcting the angular position of the apparatus relative to an offset of a toolface of the apparatus. To do the correction, a magnetic toolface of the apparatus during the rotation is determined based on geomagnetic readings of the apparatus in each of a plurality of divisions of the rotation relative to the geomagnetic field, and a gravitational toolface of the apparatus during the rotation is determined based on gravitational readings of the apparatus in each of the divisions of the rotation relative to the gravitational field. The offset of the toolface is then calculated as a difference between the magnetic toolface and the gravitational toolface. The corrected angular position can then be used in directing the apparatus.

Various implementations directed to a wellbore survey tool using Coriolis vibratory gyroscopic sensors are provided. In one implementation, a system may include a survey tool disposed in a wellbore. The survey tool may include a plurality of gyroscopic sensors configured to provide a plurality of rotation rate measurements about the survey tool, where the plurality of gyroscopic sensors includes a plurality of quartz Coriolis vibratory gyroscopic (CVG) sensors. The survey tool may further include a plurality of accelerometers configured to provide measurements of the orthogonal components of the Earth's gravitation vector with respect to the survey tool.

Various implementations directed to a wellbore survey tool using Coriolis vibratory gyroscopic sensors are provided. In one implementation, a system may include a survey tool disposed in a wellbore. The survey tool may include a plurality of gyroscopic sensors configured to provide a plurality of rotation rate measurements about the survey tool, where the plurality of gyroscopic sensors includes a plurality of quartz Coriolis vibratory gyroscopic (CVG) sensors. The survey tool may further include a plurality of accelerometers configured to provide measurements of the orthogonal components of the Earth's gravitation vector with respect to the survey tool.