Abstract: A drilling fluid channel structure of a core drilling rig includes a fluid channel activation module, a pressure relief module, a flow diverging and blocking module, a driving fluid channel and a cooling fluid channel. The fluid channel activation module, the pressure relief module and the flow diverging and blocking module are connected sequentially from the rear to the front. The driving fluid channel and the cooling fluid channel are connected at the rear side thereof to the flow diverging and blocking module. The driving fluid channel includes a driving section located between a stator and a rotor of a driving motor. The driving fluid channel is provided with a driving fluid outlet at the front side of the driving section. The cooling fluid channel passes through a layer disposed between an integrity-preserving compartment and an outer barrel.

Abstract: A drilling control mechanism of a core drilling rig has a tooth drill and a core drilling rig. The core drilling rig is inside the tooth drill and engages with the drill in a sliding manner. A locking recess is formed at an inner wall of the tooth drill. A locking latch recess is formed at an outer wall of the core drilling rig and has a locking latch therein. The locking latch has a spring. When the locking recess is directly opposite the locking latch recess, the spring extends and the locking latch partially enters the locking recess. The core drilling rig has a central rod, a fluid channel activation module, an outer barrel, and outer barrel unlocking module and a flow diverging module. The central rod passes through the inner cavities of the fluid channel activation module, the outer barrel unlocking module and the flow diverging module.

Abstract: A coring drill tool driving structure has a driving motor (7), an outer cylinder (23) and a coring drill tool (8). The driving motor comprises an outer rotor (73) and an inner stator (75), the inner wall of the outer rotor and the outer wall of the inner stator are provided with ribs (77) mutually matched, the outer rotor and inner stator are in clearance fit, the clearance between the outer rotor and the inner stator is a driving liquid flow path (74), the outer rotor length is smaller than the inner stator length, the outer rotor is located between front and rear ends of the inner stator, the outer rotor is connected to the outer cylinder, a front end of the outer cylinder is connected to the coring drill tool, and a rear end of the inner stator is connected to a coupling (76).

Abstract: A graphic rendering method includes detecting, by an electronic device, a user input event when displaying a first graphic, generating a graphic rendering instruction based on the input event, where the graphic rendering instruction includes a rendering element of a target graphic, re-rendering a first area that is in the first graphic and that needs to be re-rendered when rendering the target graphic based on the rendering element of the target graphic, synthesizing a re-rendered first area and a second area to obtain the target graphic, where the second area is an area that is in the first graphic and that does not need to be re-rendered, and displaying the target graphic.

Abstract: An acoustic emission probe positioning system, a test block for the system, and an application of the system are disclosed. The positioning system comprises a first test block and a second test block that are oppositely arranged and that define a non-closed test region. The first test block includes a first main portion and a first protruding portion that are connected to each other. The second test block includes a second main portion and a second protruding portion that are connected to each other. The first main portion and the second main portion are vertically opposite to each other, and the first protruding portion and the second protruding portion are opposite to each other left and right in a staggered manner. Multiple first probe storage holes are defined in the first main portion, and multiple second probe storage holes are defined in the first protruding portion.

Abstract: A sampling device includes a switch capacitor circuit. First ends of two switches are respectively connected to an input signal. Second end of the first switch is connected to an upper plate of a first capacitor. Second end of the second switch is connected to a lower plate of a second capacitor. A connection node connecting a lower plate of the first capacitor to an upper plate of the second capacitor is connected to a power source. The first ends of a third switch and a fourth switch are respectively connected to an input common-mode voltage. A second end of the third switch is connected to the upper plate of the first capacitor. A second end of the fourth switch is connected to the lower plate of the second capacitor. The connection node is connected to the power source. Thus, an output common-mode voltage of the sampling device is adjustable.

Abstract: An error compensation correction device for a pipeline analog-to-digital converter includes a correction pipeline stage and a conventional pipeline stage. For each correction pipeline stage, a corresponding error estimation circuit, a level edge detection circuit, a random level generation circuit, and MUX circuit being provided. The present disclosure can track and correct non-ideal properties and mismatching errors in real time over time along with the change of the surroundings without interrupting the ADC normal work of the pipeline. Thus the correction value is closer to the real situation.

Abstract: The present disclosure relates to the field of scientific drilling technology and provides a deep rock quality assurance coring device and coring method thereof. The deep rock quality assurance coring device comprises a drilling tool, a drilling bit, a central rod and a core storage body, wherein the drilling bit is mounted at the lower end of the drilling tool, the lower end of the central rod is connected to the core storage body, and the central rod is capable of driving the core storage body to move in the drilling tool in an axial direction of the drilling tool, a reservoir chamber having a lower end opening is arranged in the central rod, a core storage chamber having a lower end opening is arranged in the core storage body.

Abstract: A high-speed low-power-consumption dynamic comparator includes a latch, an AND gate, a delay unit, and an XNOR gate. According to the high-speed low-power-consumption dynamic comparator, the output signal is generated through the XNOR gate from the comparator output signals Dp and Dn. The output signal and the control signal clk1 generate the control signal of the NMOS transistor P10 through the AND gate, so that the problem of static power consumption in a conventional comparator is solved.

Abstract: A sampling device includes a switch capacitor circuit. First ends of two switches are respectively connected to an input signal. Second end of the first switch is connected to an upper plate of a first capacitor. Second end of the second switch is connected to a lower plate of a second capacitor. A connection node connecting a lower plate of the first capacitor to an upper plate of the second capacitor is connected to a power source. The first ends of a third switch and a fourth switch are respectively connected to an input common-mode voltage. A second end of the third switch is connected to the upper plate of the first capacitor. A second end of the fourth switch is connected to the lower plate of the second capacitor. The connection node is connected to the power source. Thus, an output common-mode voltage of the sampling device is adjustable.

Abstract: An error compensation correction device for a pipeline analog-to-digital converter includes a correction pipeline stage and a conventional pipeline stage. For each correction pipeline stage, a corresponding error estimation circuit, a level edge detection circuit, a random level generation circuit, and MUX circuit being provided. The present disclosure can track and correct non-ideal properties and mismatching errors in real time over time along with the change of the surroundings without interrupting the ADC normal work of the pipeline. Thus the correction value is closer to the real situation.

Abstract: A high-speed low-power-consumption dynamic comparator includes a latch, an AND gate, a delay unit, and an XNOR gate. According to the high-speed low-power-consumption dynamic comparator, the output signal is generated through the XNOR gate from the comparator output signals Dp and Dn. The output signal and the control signal clk1 generate the control signal of the NMOS transistor P10 through the AND gate, so that the problem of static power consumption in a conventional comparator is solved.

Abstract: A device for constructing an underground reservoir by dissolving limestone using carbon dioxide. The device includes a CO2 storage tank; an absorption tower; a decompression valve; a gas-liquid separator; a crystallizer; a vacuum pump; a buffer tank; a first booster pump; a second booster pump; and a third booster pump. The decompression valve is connected to a limestone layer, and is connected to the gas-liquid separator. The absorption tower is connected between the gas-liquid separator and the limestone layer.

Abstract: A device for constructing an underground reservoir by dissolving limestone using carbon dioxide. The device includes a CO2 storage tank; an absorption tower; a decompression valve; a gas-liquid separator; a crystallizer; a vacuum pump; a buffer tank; a first booster pump; a second booster pump; and a third booster pump. The decompression valve is connected to a limestone layer, and is connected to the gas-liquid separator. The absorption tower is connected between the gas-liquid separator and the limestone layer.

Abstract: A method for building an underground storehouse by dissolving limestone with carbon dioxide, the method comprising the following steps: a.) drilling two wells extending from the ground surface (1) to a limestone layer (2), building a channel (5) allowing the two wells to communicate, and installing casing pipes (3, 4) respectively in the two wells; b.) introducing CO2 gas having at least 1 MPa of pressure into a CO2 absorbing solution having the same pressure to form a CO2 solution, flowing the CO2 solution into underground via the casing pipe (3) to react with the limestone to form a calcium bicarbonate solution, forming a cavern in the meanwhile, and discharging the calcium bicarbonate solution via the other casing pipe (4); c.) decompressing the discharged calcium bicarbonate solution to decompose the calcium bicarbonate contained in the solution into CO2, water and calcium carbonate, and recycling the separated CO2 absorption solution and the CO2; repeating steps b.) and c.

Abstract: A stress monitoring device of elasto-magneto-electric (EME) effect type, for monitoring stress of a structural component of ferromagnetic materials, includes a magnetic field generating unit, a magneto-electric (ME) sensing unit, a support skeleton, and a signal controlling and conditioning instrument. Under the control of the signal controlling and conditioning instrument, the magnetic field generating unit generates a magnetic field for magnetizing the structural component. The ME sensing unit outputs an electrical signal VME characterizing the magnetic field without a need of external power supply. This electrical signal VME is analyzed and processed by the signal controlling and conditioning instrument to output a magnetic characteristic value Vst corresponding to the changes of the external forces that are exerted on the component. This stress monitoring device realizes on-line, real-time, and nondestructive monitoring, as well as off-line nondestructive monitoring.

Abstract: A pneumatic fracturing method for exploiting shale gas, the method including: 1) applying a compressed gas for a first period of time at a first pressure to a shale formation; 2) applying the compressed gas for a second period of time at a second pressure to the shale formation; and 3) repeating steps 1) and 2) to produce fissures in the shale formation. A temperature of the compressed gas is at least 80° C. A maximum pressure of the compressed gas is at least 25 megapascal, and a minimum pressure of the compressed gas is between ¼ and ? of the maximum pressure.

Abstract: A successive approximation analog-to-digital converter and conversion method thereof are provided, the successive approximation analog-to-digital converter includes a segmented-multiple-stage capacitor array with redundancy bits, a comparator, a weight-storage circuit, a code reconstruction circuit and a control logic circuit. The successive approximation analog-to-digital converter helps to decrease the complexity of circuit design, featuring small size and low power. Without auxiliary capacitor array, switches and control logic, the circuit can work to precisely measure and correct capacitor mismatch errors.

Abstract: A successive approximation analog-to-digital converter and conversion method thereof are provided, the successive approximation analog-to-digital converter includes a segmented-multiple-stage capacitor array with redundancy bits, a comparator, a weight-storage circuit, a code reconstruction circuit and a control logic circuit. The successive approximation analog-to-digital converter helps to decrease the complexity of circuit design, featuring small size and low power. Without auxiliary capacitor array, switches and control logic, the circuit can work to precisely measure and correct capacitor mismatch errors.

Abstract: A method for building an underground storehouse by dissolving limestone with carbon dioxide, the method comprising the following steps: a.) drilling two wells extending from the ground surface (1) to a limestone layer (2), building a channel (5) allowing the two wells to communicate, and installing casing pipes (3, 4) respectively in the two wells; b.) introducing CO2 gas having at least 1 MPa of pressure into a CO2 absorbing solution having the same pressure to form a CO2 solution, flowing the CO2 solution into underground via the casing pipe (3) to react with the limestone to form a calcium bicarbonate solution, forming a cavern in the meanwhile, and discharging the calcium bicarbonate solution via the other casing pipe (4); c.) decompressing the discharged calcium bicarbonate solution to decompose the calcium bicarbonate contained in the solution into CO2, water and calcium carbonate, and recycling the separated CO2 absorption solution and the CO2; repeating steps b.) and c.