Abstract: A pressure compensation device with an accumulator group for controlled pressure drilling includes an electrical flat valve, a check valve, an accumulator group, a flanged pup joint and a support base. The electrical flat valve is connected to the check valve and is mounted on a top surface of the support base. The accumulator group mounted on the whole support base is a pre-storage pressure compensation device for controlled pressure drilling, and is located at a downstream position of the check valve. The liquid inlet end of the accumulator group is connected to the check valve, and the liquid discharge end is connected to the flanged pup joint.

Abstract: A system and method of calibrating moving cameras capturing a sporting event is disclosed herein. A computing system retrieves a broadcast video feed for a sporting event. The broadcast video feed includes a plurality of video frames. The computing system labels, via a neural network, components of a playing surface captured in each video frame. The computing system matches a subset of labeled video frames to a set of templates with various camera perspectives. The computing system fits a playing surface model to the set of labeled video frames that were matched to the set of templates. The computing system identifies camera motion in each video frame using an optical flow model. The computing system generates a homography matrix for each video frame based on the fitted playing surface model and camera motion. The computing system calibrates each camera based on the homography matrix generated for each video frame.

Abstract: A circuit to cancel the effect of parasitic capacitances (“initial signals”) in calculations as to precise touch locations on a touch display screen (signal compensation circuit) includes first and second compensation circuits connected to a charge-discharge node. The first compensation circuit receives initial signals, generates first charging currents to charge, and first discharging currents to discharge, the charging-discharging node. The second compensation circuit generates second charging currents to charge, and second discharging currents to discharge, the charging-discharging node. Values of the first charging currents, the second charging currents, the first discharging currents, and the second discharging currents are of different magnitudes and are applied in order to amount to a more precise match for the exact compensation value required.

Abstract: The present invention relates to a multi-body formation reconstruction method for an unmanned device cluster control. The present invention comprises: step 1: reading a preset target formation; step 2: establishing a probability density function associated with the target formation; step 3: obtaining the current formation of all the controlled objects in the unmanned device cluster, and establishing a probability density function associated with the current formation; step 4: decreasing a cross entropy by adjusting the position of the controlled objects in the unmanned device cluster, and repeating executing the step 3 and the step 4 until the formation composed by the controlled objects in the unmanned device cluster is consistent with the target formation.

Abstract: An assistive device structure for positioning and pressure relief is provided, including a first elastic layer and a second elastic layer, which are attached by using a high-frequency encapsulation process, sealing, bagging, thermoforming, or an integrally molding process. Each of the first and second elastic layers has a bottom surface and an arc surface disposed opposite to each other. The arc surface includes two protrusions and a recess formed there in between. The two protrusions have different heights. A hollow area is disposed in the recess of the first and second elastic layers. Based on such structure, the bottom surfaces of the first and second elastic layers are attached to form the proposed assistive device structure for a user to lean against and providing multiple positioning effects and pressure relief. More than four axial directions of supporting forces are generated to effectively enhance muscle relaxation and stress relief.

Abstract: A system and method of re-identifying players in a broadcast video feed are provided herein. A computing system retrieves a broadcast video feed for a sporting event. The broadcast video feed includes a plurality of video frames. The computing system generates a plurality of tracks based on the plurality of video frames. Each track includes a plurality of image patches associated with at least one player. Each image patch of the plurality of image patches is a subset of the corresponding frame of the plurality of video frames. For each track, the computing system generates a gallery of image patches. A jersey number of each player is visible in each image patch of the gallery. The computing system matches, via a convolutional autoencoder, tracks across galleries. The computing system measures, via a neural network, a similarity score for each matched track and associates two tracks based on the measured similarity.

Abstract: A system and method of calibrating moving cameras capturing a sporting event is disclosed herein. A computing system retrieves a broadcast video feed for a sporting event. The broadcast video feed includes a plurality of video frames. The computing system labels, via a neural network, components of a playing surface captured in each video frame. The computing system matches a subset of labeled video frames to a set of templates with various camera perspectives. The computing system fits a playing surface model to the set of labeled video frames that were matched to the set of templates. The computing system identifies camera motion in each video frame using an optical flow model. The computing system generates a homography matrix for each video frame based on the fitted playing surface model and camera motion. The computing system calibrates each camera based on the homography matrix generated for each video frame.

Abstract: A system and method of generating trackable frames from a broadcast video feed are provided herein. A computing system retrieves a broadcast video feed for a sporting event. The broadcast video feed includes a plurality of video frames. The computing system generates a set of frames for classification using a principal component analysis model. The set of frames are a subset of the plurality of video frames. The computing system partitions each frame of the set of frames into a plurality of clusters. The computing system classifies each frame of the plurality of frames as trackable or untrackable. Trackable frames capture a unified view of the sporting event. The computing system compares each cluster to a predetermined threshold to determine whether each cluster comprises at least a threshold number of trackable frames. The computing system classifies each cluster that includes at least the threshold number of trackable frames as trackable.

Abstract: A wheel grinder contains: a body, a work table, a vertical limitation frame, a movable adjustment portion configured to move vertically, a grinding wheel portion extending outward from the movable adjustment portion, and a motor fixed on the movable adjustment portion. The vertical limitation frame has two fixing holders, two mountings, and two first screw rods and two second screw rods which are inserted through the two mountings respectively and abut against a bottom of the movable adjustment portion. In addition, a stop cover is covered on the grinding wheel portion and includes a defining plate configured to define a connection shaft and an opening inside the defining plate.

Abstract: A hydrodynamic water blocking device for an underground garage includes a water blocking plate assembly and side rail assemblies, wherein the water blocking plate assembly includes a first water blocking element, one end of the first water blocking element is rotationally connected with a base, the other end of the first water blocking element is rotationally connected with one end of a second water blocking element, the first and second water blocking elements have foamed layers, the base has grooves capable of accommodating the embedded foamed layers, water inlets formed in the base communicate with the grooves, each of the side rail assemblies includes a side plate with an ascending rail including a horizontally disposed linear rail and an arc-shaped lifting rail, the second water blocking element has a walking assembly embedded in the ascending rail which is connected with a driving mechanism installed at the second water blocking element.

Abstract: A hydrodynamic water blocking device for an underground garage includes a water blocking plate assembly and side rail assemblies, wherein the water blocking plate assembly includes a first water blocking element, one end of the first water blocking element is rotationally connected with a base, the other end of the first water blocking element is rotationally connected with one end of a second water blocking element, the first and second water blocking elements have foamed layers, the base has grooves capable of accommodating the embedded foamed layers, water inlets formed in the base communicate with the grooves, each of the side rail assemblies includes a side plate with an ascending rail including a horizontally disposed linear rail and an arc-shaped lifting rail, the second water blocking element has a walking assembly embedded in the ascending rail which is connected with a driving mechanism installed at the second water blocking element.

Abstract: A pusher for a planer contains: a body, a planer, a movable control portion, and a push member. The planer includes a cutter, a drive shaft, a transmission portion, a horizontal rod, a reduction wheel, and a threaded portion. An upper belt is fitted on the lower belt, a wheel rod and an auxiliary rod. The wheel rod includes a second receiving portion, a guiding portion, and a pushing wheel. The guiding portion has a transmitting belt fitted on an actuation rod. The actuation rod has a driving portion and another pushing wheel. The auxiliary rod is supported on an auxiliary abutting block inserted onto a positioning rod, and a returning spring is fitted on the positioning rod. The movable control portion includes a rotary shaft and a movable pedestal. The press post has two pressing wheels, and a control wheel is biased against the transmitting belt.

Abstract: A wheel grinder contains: a body, a work table, a vertical limitation frame, a movable adjustment portion configured to move vertically, a grinding wheel portion extending outward from the movable adjustment portion, and a motor fixed on the movable adjustment portion. The vertical limitation frame has two fixing holders, two mountings, and two first screw rods and two second screw rods which are inserted through the two mountings respectively and abut against a bottom of the movable adjustment portion. In addition, a stop cover is covered on the grinding wheel portion and includes a defining plate configured to define a connection shaft and an opening inside the defining plate.

Abstract: An encapsulation method of electronic components comprises steps as follows: preparing electronic components with cylindrical bodies wherein a cylindrical body has front and rear ends made of metals and a middle end made of ceramics and the front end or the rear end features an outer diameter greater than the middle end of the cylindrical body; preparing a mould consisting of upper and lower moulds; encasing the cylindrical bodies inside the upper and lower moulds, injecting heated and softened protective materials into the mould in which protective materials as protective layers are coated on the cylindrical bodies; injecting the cylindrical bodies removed from the upper and lower moulds into a roller in which excessive protective layers on the front and rear ends of the cylindrical bodies are de-coated.

Abstract: A pusher for a planer contains: a body, a planer, a movable control portion, and a push member. The planer includes a cutter, a drive shaft, a transmission portion, a horizontal rod, a reduction wheel, and a threaded portion. An upper belt is fitted on the lower belt, a wheel rod and an auxiliary rod. The wheel rod includes a second receiving portion, a guiding portion, and a pushing wheel. The guiding portion has a transmitting belt fitted on an actuation rod. The actuation rod has a driving portion and another pushing wheel. The auxiliary rod is supported on an auxiliary abutting block inserted onto a positioning rod, and a returning spring is fitted on the positioning rod. The movable control portion includes a rotary shaft and a movable pedestal. The press post has two pressing wheels, and a control wheel is biased against the transmitting belt.

Abstract: A ladder chair contains: a body, a continuous track assembly, and a lifting mechanism. The body includes a sitting portion arranged on a top thereof and a pedal extending outward from a bottom of the body. The climbing assembly is arranged on a rear end of the body. The lifting mechanism is located behind the body and the sitting portion, and the lifting mechanism includes two telescopic posts and two rollers individually disposed on two bottoms of the two telescopic posts. The climbing assembly includes two continuous tracks arranged on two peripheral sides thereof respectively and obliquely extending upward relative to the body, a transmission shaft mounted on a bottom of the climbing assembly, two idlers respectively fixed on two tops of the two continuous tracks. Each continuous track is defined between the transmission shaft and each idler and is driven by the transmission shaft to rotate.

Abstract: An encapsulation method of electronic components comprises steps as follows: preparing electronic components with cylindrical bodies wherein a cylindrical body has front and rear ends made of metals and a middle end made of ceramics and the front end or the rear end features an outer diameter greater than the middle end of the cylindrical body; preparing a mould consisting of upper and lower moulds; encasing the cylindrical bodies inside the upper and lower moulds, injecting heated and softened protective materials into the mould in which protective materials as protective layers are coated on the cylindrical bodies; injecting the cylindrical bodies removed from the upper and lower moulds into a roller in which excessive protective layers on the front and rear ends of the cylindrical bodies are de-coated.

Abstract: A flat sanding structure contains: a body including a first and a second wood planing zones. The second wooding zone has two supporting shelves and two grinding wheels. Two supports are connected with two first fixing pieces and two second fixing pieces, a third holding plate is fixed between the two grinding wheels and the two supporting shelves. Said each first fixing piece has a first through orifice and two elongated orifices, a first connecting shaft has a threaded orifice, a first holder is defined between the two first fixing pieces, and two posts are inserted into the two first fixing pieces and connected with the first holder. The first holder has a tab and an elongated hole. A second connecting shaft is inserted into each second fixing piece, a second holder is defined between the two second fixing pieces, and one of the two supports has a column.

Abstract: A removal structure for a central shaft of a sanding belt is fixed on a grinding machine, and the grinding machine contains: a driver, a driving shaft mounted on a top of the driver, a fitting sleeve extending outwardly from a central position of the driving shaft, a conical groove defined in the fitting sleeve, and at least one L-shaped notch formed on a peripheral wall of the fitting sleeve. A connection column is fitted with the driving shaft and includes a central shaft formed in a cone shape so as to correspond to the conical groove of the fitting sleeve, and the central shaft has at least one locking post corresponding to the at least one L-shaped notch.