Abstract: Embodiments of the present disclosure relate to an electrostatic protection structure and an electrostatic protection circuit. The electrostatic protection structure includes: a SCR structure and a trigger structure; the SCR structure includes: a well region of a second conductivity type and a first well of a first conductivity type region, a first-doped region of the first conductivity type, and a first-doped region of the second conductivity type; the trigger structure includes: a first-doped region of the second conductivity type, a second well region of the first conductivity type, a second-doped region of two conductivity types, a third-doped region of the second conductivity type, a fourth-doped region of the second conductivity type, and a first gate electrode.

Abstract: A jet flow adjustment method for rotary steerable downhole release includes steps of: defining a diversion ratio p of a jet nozzle by a ground control system; and sending the diversion ratio p of the jet nozzle to a control unit of a downhole rotary steerable system; and determining an opening areas of the jet nozzle by the control unit according to the diversion ratio p of the jet nozzle and an equivalent channel area S of a drilling tool; controlling an adjustable bypass valve by the control unit of the downhole rotary steerable system according to the calculated opening area s of the jet nozzle, so as to control an overlapping area between sector holes of a rotor end and a stator end, thereby opening the jet nozzle for release. The present invention has simple control and strong release ability.

Abstract: A discharge unit is connected to a power pad, a ground pad, and an I/O pad, and can discharge an electrostatic charge when an electrostatic pulse appears on any of the power pad, the ground pad, and the I/O pad. The discharge unit includes a first discharge unit and a second discharge unit, the first discharge unit is connected to the second discharge unit, the power pad, and the I/O pad, and the second discharge unit is connected to the ground pad and the I/O pad. The first discharge unit and/or the second discharge unit can discharge electrostatic charges on different pads, respectively.

Abstract: A jet flow adjustment method for rotary steerable downhole release relates to a technical field of downhole drilling equipment for oil wells, which includes steps of: defining a diversion ratio p of a jet nozzle (2) by a ground control system according to a cleaning requirement of a cuttings bed; and sending the diversion ratio p of the jet nozzle (2) to a control unit of a downhole rotary steerable system; and determining an opening area s of the jet nozzle (2) by the control unit of the downhole rotary steerable system according to the diversion ratio p of the jet nozzle (2) and an equivalent channel area S of a drilling tool, wherein a calculation formula is: s=p*S/(1?p); controlling an adjustable bypass valve (3) by the control unit of the downhole rotary steerable system according to the calculated opening area s of the jet nozzle (2), so as to control an overlapping area between sector holes (9) of a rotor end (7) and a stator end (8), thereby opening the jet nozzle (2) for release.

Abstract: A flexible hose has a length of hollow tubing and a closed cuff. A method for manufacturing a flexible hose, has the steps of providing a length of flexible tubing, providing a closable cuff, aligning the closable cuff with the hollow tubing at a closed cuff location, and affixing the closable cuff to the length of hollow tubing by closing the closable cuff around the length of hollow tubing at the closed cuff location, thereby forming a flexible hose having a closed cuff. The method does not include the step of screwing the closable cuff onto the length of hollow tubing. Devices may also contain such a flexible hose.

Abstract: A method for synthesizing a polybutylene adipate terephthalate-polylactic acid (PBAT-PLA) copolyester, the method including: uniformly blending a first prepolymer PBAT and a second prepolymer PLA to yield a mixture, 0putting the mixture in a vacuum reactor with a vacuum degree of between 5 and 100 pascal, heating the vacuum reactor to a temperature of between 100 and 110° C., and allowing to react for between 0.5 and 1 hr; stepwise increasing the temperature to be between 145 and 155° C. in between 1 and 2 hrs, and allowing to react for between 5 and 10 hrs, to yield a PBAT-PLA copolyester with a weight-average molecular weight of between 100000 and 250000. The method for synthesizing the PBAT-PLA copolyester is eco-friendly, non-toxic and cost-efficient.

Abstract: The present invention discloses a self-adjustable gas isolator, including a floater, a liquid storage device, a liquid outlet, a cover plate, a liquid discharging hole and a pressure balancing device. The floater has a pressure relief port; the pressure balancing device is connected with the floater in fixed position; the floater is sleeved in the liquid storage device and the floater goes up and down along with liquid level in the liquid storage device. The sealing device regulates the opening degree between the floater and the liquid outlet automatically according to the liquid volume discharged, and the pressure balancing device releases gas pressure preventing liquid from discharging, and the discharging speed of liquid is fast. The self-adjustable gas isolator is simple in structure, no components for hooking sundries in its channel, and is not easy to jam. When discharging liquid, the floater swings or rotates with self-cleaning function.

Abstract: A method for synthesizing a polybutylene adipate terephthalate-polylactic acid (PBAT-PLA) copolyester, the method including: uniformly blending a first prepolymer PBAT and a second prepolymer PLA to yield a mixture, putting the mixture in a vacuum reactor with a vacuum degree of between 5 and 100 pascal, heating the vacuum reactor to a temperature of between 100 and 110° C., and allowing to react for between 0.5 and 1 hr; stepwise increasing the temperature to be between 145 and 155° C. in between 1 and 2 hrs, and allowing to react for between 5 and 10 hrs, to yield a PBAT-PLA copolyester with a weight-average molecular weight of between 100000 and 250000. The method for synthesizing the PBAT-PLA copolyester is eco-friendly, non-toxic and cost-efficient.

Abstract: The present invention discloses a self-adjustable gas isolator, including a floater, a liquid storage device, a liquid outlet, a cover plate, a liquid discharging hole and a pressure balancing device. The floater has a pressure relief port; the pressure balancing device is connected with the floater in fixed position; the floater is sleeved in the liquid storage device and the floater goes up and down along with liquid level in the liquid storage device. The sealing device regulates the opening degree between the floater and the liquid outlet automatically according to the liquid volume discharged, and the pressure balancing device releases gas pressure preventing liquid from discharging, and the discharging speed of liquid is fast. The self-adjustable gas isolator is simple in structure, no components for hooking sundries in its channel, and is not easy to jam. When discharging liquid, the floater swings or rotates with self-cleaning function.

Abstract: A power booster includes a conversion device, a power boosting component, a power boosting friction block, a friction part, a power boosting support, a sliding device. The conversion device is fixed to the power boosting component, the power boosting friction block is fixed to the power boosting component, the power boosting friction block and the friction part contact with each other after being pressed, the power boosting component is movably connected to the power boosting support, the friction part is movably connected to the power boosting support, the sliding device is connected to the power boosting component and the power boosting support. The power booster introduces the controlling force from the inlet, and amplifies the controlling force. The amplified controlling force is output by the power boosting component to push the part that needs to be controlled.