Abstract: The present disclosure provides a height-adjustable mount, comprising a first frame assembly, a second frame assembly, a rotation assembly, and a balance assembly. The first frame assembly includes a first frame and a middle connecting plate coupled to the first frame. The first frame assembly is slidably disposed relative to the second frame assembly. Two rotation assemblies are symmetrically disposed along the first direction, and each rotation assembly includes a first rotating member and a second rotating member. The balance assembly includes two elastic members or assemblies symmetrically disposed along the first direction. Wherein the rotation assemblies enable the first frame to move up and down relative to the second frame and stop at any position under the action of an external force, and the elastic force generated by the elastic member or assembly, the first elastic member and the second elastic member is used to counteract the gravity of the load of the first frame.

Abstract: A tetrahydronaphthyridine derivative is used in preparing a medicine. The tetrahydronaphthyridine derivative is effective in preventing and treating gastrointestinal tract injury-related diseases or inhibiting gastrointestinal protein kinase.

Abstract: Disclosed are an electric patrol inspection control method and an electric patrol inspection control system based on an unmanned aerial vehicle. The method includes: formulating a flight path according to an electric patrol inspection area, collecting an image and position information, and transmitting the image and the position information to a receiving terminal of a ground station in a form of wireless transmission; obtaining analysis on defects, damages and corrosion of the electric device, processing and analyzing the image, and then obtaining analysis situations; and generating a patrol inspection electronic report, and at the same time, giving the service life, maintenance expense, maintenance measure of the electric device according to the patrol inspection electronic report, informing maintenance personnel of the position information of the electric device.

Abstract: A method for imaging tissues behind obstacles includes following steps: (1) providing an ultrasound array transducer that includes at least four active elements; (2) spraying a data sample of an ultrasound beam along an impulse response curve into an output image domain; (3) binning each point on the impulse response curve by a value of an unique attribute; (4) summing an image value at the each point on the impulse response curve into a corresponding partial image volume associated with the unique attribute; (5) repeating steps (2)-(4) for all data samples of all ultrasound beams to obtain a plurality of partial image volumes; (6) sorting the partial image volumes by the unique attribute to generate common image point gathers; and (7) obtaining an image of the tissues by stacking common image point gathers at all output locations.

Abstract: Disclosed are an electric patrol inspection control method and an electric patrol inspection control system based on an unmanned aerial vehicle. The method includes: formulating a flight path according to an electric patrol inspection area, collecting an image and position information, and transmitting the image and the position information to a receiving terminal of a ground station in a form of wireless transmission; obtaining analysis on defects, damages and corrosion of the electric device, processing and analyzing the image, and then obtaining analysis situations; and generating a patrol inspection electronic report, and at the same time, giving the service life, maintenance expense, maintenance measure of the electric device according to the patrol inspection electronic report, informing maintenance personnel of the position information of the electric device.

Abstract: A MEMS device includes a substrate, a set of spring, and a proof mass suspended above and coupled to the substrate by the springs. Each spring includes a corresponding anchor on the substrate and a beam extending away from that anchor. Each beam has a fixed end that is coupled to the anchor by a first linkage at one end of the beam proximal to the anchor and a free end that is coupled to the proof mass by a second linkage at an end of the beam that is distal to the anchor. The anchors are arranged symmetrically around a center of the proof mass. The proof mass translates vertically with respect to the substrate and when a vertical displacement of the proof mass toward the substrate reaches a predefined value, the free end of each spring contacts the substrate and prevents the proof mass from contacting the substrate.

Abstract: An electrically driven control system for a rotatable upright blast door comprises: a blast door including a door body; an opening and closing device of electric cylinder of rotatable upright door body including a drive motor module and a push rod coupled to a power output end of the drive motor module, and the opening and closing device of electric cylinder of rotatable upright door body is hinged relative to the mounting base, and the push rod is hinged to the door body. In the present invention, the opening and closing of the door body is driven by an electric cylinder structure, which has a small layout space and a large opening and closing torque. An opening and closing device of electric cylinder of rotatable upright door body has a simple structure, which reduces the complexity of maintenance and management.

Abstract: An example photoionization detector is provided. The example photoionization detector includes an insulation spacer component and a signal collection electrode component disposed on the first surface of the insulation spacer component. In some examples, the signal collection electrode component includes a first electrode layer and a second electrode layer.

Abstract: This application relates to a bicycle rack. The bicycle rack includes a column, a wheel fixing mechanism including a first locking member, a second locking member, and a locking assembly. The wheel fixing mechanism also includes a base and a wheel holder mounted on the base. The locking assembly has a first locking position that engages with the first locking member, and a second locking position that engages with the second locking member. When the locking assembly is in the first locking position, the first locking member contacts the wheel holder, causing the wheel holder to be in a clamping state. When the locking assembly is in the second locking position, the first locking member is separated from the locking assembly, placing the wheel holder in a released state, while the locking assembly engages with the second locking member.

Abstract: An error calibration method of a nitrogen-vacancy center (NV) vector magnetometer is disclosed. The method includes acquiring corresponding magnetic field intensity NV vector magnetometer measured data in various postures and constructing an error expression of the NV vector magnetometer. The error expression of the NV vector magnetometer is a relational expression among the magnetic field intensity measured data, magnetic field intensity real data and an error coefficient and the error coefficient includes a combination coefficient and a zero-bias error coefficient. All the magnetic field intensity measured data are fit based on an ellipsoid fitting method. The error coefficient is solved to obtain a determined error coefficient. The determined error coefficient is substituted into the error expression of the NV vector magnetometer to obtain an error model of the NV vector magnetometer. The magnetic field intensity measured data is substituted into the error model of the NV vector magnetometer.

Abstract: A data backup method, a medium and an electronic device are provided. The data backup method includes: generating a recovery point deletion task, where the recovery point deletion task is used to instruct to delete a target recovery point in a backup repository, and the backup repository is used to manage backup data and backup indexes corresponding to respective recovery points; and delivering the recovery point deletion task to a backup work service node, and instructing the backup work service node to determine first target data to be deleted according to a first backup index corresponding to the target recovery point, a second backup index corresponding to a preceding recovery point of the target recovery point, and a third backup index corresponding to a subsequent recovery point of the target recovery point, and delete the first target data and the first backup index from the backup repository.

Abstract: Provided are a compound of formula (I) having an effect of regulating and controlling the activity of 15-PGDH, a stereoisomer, a tautomer or a form of a mixture thereof, or a pharmaceutically acceptable salt thereof, or a solvate thereof, or a prodrug thereof, a pharmaceutical composition comprising same, and a preparation method therefor and the use thereof as a 15-PGDH inhibitor.

Abstract: An example photoionization detector is provided. The example photoionization detector includes an insulation spacer component and a signal collection electrode component disposed on the first surface of the insulation spacer component. In some examples, the signal collection electrode component includes a first electrode layer and a second electrode layer.

Abstract: A nitride-based semiconductor device includes a source electrode and a drain electrode, a first gate electrode, and a second gate electrode. The first gate electrode is disposed between the source electrode and the drain electrode. The first gate electrode includes a first gate bottom portion and a first gate top portion. The first gate top portion is located over the first gate bottom portion and wider than the first gate bottom portion. The second gate electrode is disposed above the first gate electrode and between the source electrode and the drain electrode. The second gate electrode includes a second gate bottom portion and a second gate top portion. The second gate bottom portion is in contact with the first gate bottom portion. The second gate top portion is located over the second gate bottom portion and wider than the second gate bottom portion.

Abstract: Disclosed is a paper sheet conveyance device, including: a pair of conveyance rollers that rotates to convey a paper sheet passing through them; and a driver that drives the pair of conveyance rollers to rotate. The paper sheet conveyance device further includes a hardware processor that controls the driver to drive the pair of conveyance rollers to rotate, such that before the paper sheet breaks into the pair of conveyance rollers, a rotation speed of the pair of conveyance rollers reaches a predetermined conveyance speed, and after the paper sheet is separated from the pair of conveyance rollers, the pair of conveyance rollers continue to rotate to a predetermined position to stop.

Abstract: The invention discloses a plant-derived composition, comprising, by weight, 30%-50% of a first plant component, 37%-57% of a second plant component, and 5%-20% of a third plant component. The plant-derived composition of the invention has high antioxidant capacity, can efficiently scavenge human free radicals, and can be used as a composite dietary supplement for supplementing essential nutrients for human body.

Abstract: A compound represented by formula I, a pharmaceutically acceptable salt, a hydrate, an isomer, a prodrug, or a mixture thereof are suitable for preparing a product for improving hyperpigmentation. The compound may be effective in treating melasma.

Abstract: The invention relates to an information security protection method and apparatus, and a computer-readable storage medium. The information security protection method comprises the steps of: allocating a train control and monitoring system to an intranet region, and performing region boundary security protection on the train control and monitoring system; performing communication network security protection on the train control and monitoring system; and performing terminal device security protection on the train control and monitoring system.

Abstract: An ultrasound system includes: a V-wave ultrasound data acquisition system with a transducer that includes an array of transducer elements, the array of transducer elements including a first sub-array and a second sub-array; a V-wave ultrasound beamformer to receive ultrasound beams from the V-wave ultrasound data acquisition system and generate ultrasound images; and an ultrasound image display to render the ultrasound images locally or transmit the images over internet.