Abstract: The present disclosure provides a coal bump control method for sectional hydraulic fracturing regions of a near vertical ultra thick coal seam. The method includes: deepening a main shaft from a mining level to a fracturing level; excavating a cross-hole from a roof rock layer of a coal seam at the fracturing level to enter a coal seam being mined, and excavating a roadway along the strike of the coal seam; and drilling hydraulic fracturing boreholes in a dedicated fracturing roadway along an inclination angle of the coal seam to the coal seam above the roadway, wherein the length of the borehole makes the borehole in communication with a goaf, and the spacing of the boreholes along the strike and the sectional spacing of the boreholes in an inclination direction are designed according to the parameters of fracturing equipments and the fracturing length.

Abstract: The present application provides a method for preparing a prelithiated positive electrode current collector, the method comprising the following steps: gasifying a lithium source in an evaporation chamber filled with a protective gas; enabling an aluminum foil layer to pass through the evaporation chamber and depositing the metal lithium on a surface of the aluminum foil layer by means of vapor deposition; and transferring the aluminum foil layer deposited with the metal lithium to an annealing chamber filled with a protective gas and performing high-temperature annealing to form a lithium-aluminum alloy layer on the surface of the aluminum foil layer.

Abstract: A method is disclosed that divide a total frequency band of a communication system into several equally spaced non-overlapping information channels, which are allocated to different users; the information channels are in one-to-one correspondence with the users; user signals from different addresses are distinguished based on frequency, thereby completing the multiple access connection; and duplex communication between two users uses a fundamental frequency and harmonics for information transmission. A process of the information transmission is as follows: different information is first modulated and then is separately loaded on different harmonic components, different information is transmitted through different harmonic components or component combinations so that each pair of information channels can transmit N groups of different information at the same time, and finally the fundamental frequency and harmonic information received by a receiving end is demodulated to obtain all the transmitted information.

Abstract: The present disclosure discloses a terahertz detector based on a Schottky contact grating structure. THz response frequency points are adjusted by adjusting parameters (a grating width, a grating length, a grating region area, a grating period, and a grating pattern form) of the Schottky contact grating structure (in the detector design stage, the grating structure parameters can be adjusted according to the actually required detection frequency points (single frequency point or multiple frequency points)), thereby realizing single-frequency detection or realizing that one detector supports the detection of multiple frequency points. The grating is introduced into the Schottky Barrier Diode, so that the grated Schottky contact resonates with the terahertz waves, the plasma resonance effect is enhanced, and the detection sensitivity is further improved.

Abstract: The present application relates to an N×M terahertz detector array imaging system based on a multi-frequency antenna structure, wherein a single-frequency-point terahertz antenna used for receiving terahertz signals in a traditional detector is replaced with a multi-frequency-point terahertz antenna, thereby realizing that one detector supports the detection of multiple arbitrary different frequency points. The traditional detector needs to replace detectors with different frequency points for detection of different frequency points. The present application can design a multi-frequency-point terahertz antenna with arbitrary different frequency points according to actual needs, so that one detector can support the detection of multiple arbitrary different frequency points without the replacement of the terahertz detector, effectively reducing the cost of terahertz detection and imaging.

Abstract: The present disclosure discloses an N×M terahertz detector array imaging system based on a Schottky contact rasterization structure. The rasterization is introduced into the Schottky barrier diode, so that the rasterized Schottky contact resonates with the terahertz waves, the plasma resonance effect is enhanced, and the detection sensitivity of the array unit can be further improved. Moreover, there is no need to use an antenna, which can effectively avoid the problems such as large loss of the on-chip antenna, low gain efficiency, and difficulty in verifying through DRC design rules; and the chip area is greatly reduced, which greatly reduces the production cost. Finally, by adjusting the rasterization structure parameters of the array detector unit during the design process, the detector array can realize monochromatic array imaging or multicolor array imaging, which provides a new solution for the realization of low-cost, high-performance terahertz array cameras and terahertz imagers.

Abstract: The present application relates to a new terahertz spectrum analyzer, which adopts a detector based on an NMOSFET gate rasterization structure, a detector based on a Schottky contact rasterization structure, a detector based on an HMET gate rasterization structure, and a detector based on a “wave-to-heat conversion structure”, an NMOSFET detector based on a multi-frequency terahertz antenna structure, and an SBD detector based on the multi-frequency terahertz antenna structure as a core component (i.e. sensor) for electromagnetic wave detection, so that the coverage band is wider. In addition, all circuits can be realized by a common integrated circuit process, so that the terahertz spectrum analyzer proposed by the present application has the advantages of small size, low cost, and low power consumption.

Abstract: A drilling liner is configured to be positioned in a lost circulation zone of a subterranean formation in which a wellbore is being drilled. The drilling liner is configured to flow wellbore drilling fluids from a surface of the wellbore to the subterranean formation while avoiding the lost circulation zone. The drill head assembly is attached to a downhole end of the drilling liner, and is configured to drill the subterranean formation to form cuttings, receive the wellbore drilling fluids, and flow the cuttings and the wellbore drilling fluids into the drilling liner while avoiding the lost circulation zone and towards the surface of the wellbore.

Abstract: A drilling bottom hole assembly for loss circulation mitigation includes a drill bit configured to drill a wellbore in a formation. The drill bit is attached to a drill string. The wellbore includes a high-loss circulation zone into which drilling fluid is lost during drilling the wellbore. An under reamer is attached to the drill string upstring of the drill bit. The under reamer is downhole of the high-loss circulation zone. The under reamer, in response to actuation, is configured to widen a diameter of the high-loss circulation zone. An expansion assembly is connected to the under reamer. The expansion assembly surrounds the drill string upstring of the under reamer. The expansion assembly is configured to cover the high-loss circulation zone after the diameter of the high-loss circulation zone is widened by the under reamer.

Abstract: The present disclosure discloses a terahertz detector based on a Schottky contact rasterization structure. THz response frequency points are adjusted by adjusting parameters (a width, length, region area, period and pattern form of a raster) of the Schottky contact rasterization structure (in the detector design stage, the rasterization structure parameters can be adjusted according to the actually required detection frequency points (single frequency point or multiple frequency points)), thereby realizing single-frequency detection or realizing that one detector supports the detection of multiple frequency points. The rasterization is introduced into the Schottky Barrier Diode, so that the rasterized Schottky contact resonates with the terahertz waves, the plasma resonance effect is enhanced, and the detection sensitivity is further improved.

Abstract: The present application relates to an N×M terahertz detector array imaging system based on a multi-frequency antenna structure, wherein a single-frequency-point terahertz antenna used for receiving terahertz signals in a traditional detector is replaced with a multi-frequency-point terahertz antenna, thereby realizing that one detector supports the detection of multiple arbitrary different frequency points. The traditional detector needs to replace detectors with different frequency points for detection of different frequency points. The present application can design a multi-frequency-point terahertz antenna with arbitrary different frequency points according to actual needs, so that one detector can support the detection of multiple arbitrary different frequency points without the replacement of the terahertz detector, effectively reducing the cost of terahertz detection and imaging.

Abstract: The present disclosure discloses an N×M terahertz detector array imaging system based on a Schottky contact rasterization structure. The rasterization is introduced into the Schottky barrier diode, so that the rasterized Schottky contact resonates with the terahertz waves, the plasma resonance effect is enhanced, and the detection sensitivity of the array unit can be further improved. Moreover, there is no need to use an antenna, which can effectively avoid the problems such as large loss of the on-chip antenna, low gain efficiency, and difficulty in verifying through DRC design rules; and the chip area is greatly reduced, which greatly reduces the production cost. Finally, by adjusting the rasterization structure parameters of the array detector unit during the design process, the detector array can realize monochromatic array imaging or multicolor array imaging, which provides a new solution for the realization of low-cost, high-performance terahertz array cameras and terahertz imagers.

Abstract: The present application relates to a new terahertz spectrum analyzer, which adopts a detector based on an NMOSFET gate rasterization structure, a detector based on a Schottky contact rasterization structure, a detector based on an HMET gate rasterization structure, and a detector based on a “wave-to-heat conversion structure”, an NMOSFET detector based on a multi-frequency terahertz antenna structure, and an SBD detector based on the multi-frequency terahertz antenna structure as a core component (i.e. sensor) for electromagnetic wave detection, so that the coverage band is wider. In addition, all circuits can be realized by a common integrated circuit process, so that the terahertz spectrum analyzer proposed by the present application has the advantages of small size, low cost, and low power consumption.

Abstract: The present disclosure discloses a video encryption method comprising: acquiring image frames continuously by using an image acquisition component, and storing the image frames into a frame buffer; acquiring a time encryption sequence, and using the time encryption sequence to obtain an address encryption sequence; and reading each of the image frames in the frame buffer according to the address encryption sequence to obtain an encrypted video when the frame buffer is full. The method continuously acquires the image frames and uses the time encryption sequence to obtain the address encryption sequence, and when the frame buffer is full, each of the image frames in the frame buffer is read according to the address encryption sequence to obtain an encrypted video. In addition, the present disclosure also provides a video encryption apparatus, an image capture device, and a computer readable storage medium, which also have the above-mentioned beneficial effects.

Abstract: The present disclosure discloses an image encryption method comprising: acquiring a row encryption sequence and a column encryption sequence, and acquiring, from a pixel array component of a sensor, pixel rows corresponding to the respective elements of the row encryption sequence; encrypting and sorting pixels in each of the pixel rows by using the column encryption sequence to obtain encrypted pixel rows corresponding to the respective pixel rows; and arranging the encrypted pixel rows according to a preset arrangement order to obtain an encrypted image. The method may perform encryption when generating an original image to obtain an encrypted image. In addition, the present disclosure also provides an image encryption apparatus, a sensor, and a computer readable storage medium, which also have the above-mentioned beneficial effects.

Abstract: A method is disclosed that divide a total frequency band of a communication system into several equally spaced non-overlapping information channels, which are allocated to different users; the information channels are in one-to-one correspondence with the users; user signals from different addresses are distinguished based on frequency, thereby completing the multiple access connection; and duplex communication between two users uses a fundamental frequency and harmonics for information transmission. A process of the information transmission is as follows: different information is first modulated and then is separately loaded on different harmonic components, different information is transmitted through different harmonic components or component combinations so that each pair of information channels can transmit N groups of different information at the same time, and finally the fundamental frequency and harmonic information received by a receiving end is demodulated to obtain all the transmitted information.

Abstract: A system includes at least one hardware processor interoperably coupled with computer memory and configured to perform operations of one or more components of the computer-implemented system. The system includes a detachable module (DM) delivery system configured to deploy, from release grooves of the NRSS and during a survey of the NRSS inside a wellbore during drilling of a well, plural DMs into an environment surrounding the NRSS, wherein the plural DMs are pre-loaded into the NRSS, and plural DMs are configured to gather and store sensing data from the environment.

Abstract: The present disclosure discloses a terahertz detector based on a N×M dielectric resonant antenna array, wherein a N×M on-chip dielectric resonant terahertz antenna array is connected to a matching network, the matching network is connected to a source of a NMOSFET, a gate of the NMOSFET is sequentially connected to a first bias resistor and a first bias voltage, a third transmission line is connected between the first bias resistor and the gate, a drain of the NMOSFET is connected to a first DC blocking capacitor, the other end of the first DC blocking capacitor is connected to a low noise preamplifier, a second bias resistor and a second bias voltage are further connected between the first DC blocking capacitor and the low noise preamplifier, and the low noise preamplifier is further provided with a voltage feedback loop. The present disclosure also discloses a design method for the same.

Abstract: A drilling bottom hole assembly for loss circulation mitigation includes a drill bit configured to drill a wellbore in a formation. The drill bit is attached to a drill string. The wellbore includes a high-loss circulation zone into which drilling fluid is lost during drilling the wellbore. An under reamer is attached to the drill string upstring of the drill bit. The under reamer is downhole of the high-loss circulation zone. The under reamer, in response to actuation, is configured to widen a diameter of the high-loss circulation zone. An expansion assembly is connected to the under reamer. The expansion assembly surrounds the drill string upstring of the under reamer. The expansion assembly is configured to cover the high-loss circulation zone after the diameter of the high-loss circulation zone is widened by the under reamer.

Abstract: The present disclosure discloses an image encryption method comprising: acquiring a row encryption sequence and a column encryption sequence, and acquiring, from a pixel array component of a sensor, pixel rows corresponding to the respective elements of the row encryption sequence; encrypting and sorting pixels in each of the pixel rows by using the column encryption sequence to obtain encrypted pixel rows corresponding to the respective pixel rows; and arranging the encrypted pixel rows according to a preset arrangement order to obtain an encrypted image. The method may perform encryption when generating an original image to obtain an encrypted image. In addition, the present disclosure also provides an image encryption apparatus, a sensor, and a computer readable storage medium, which also have the above-mentioned beneficial effects.