Abstract: A distributed acoustic sensing (DAS) system based on space-division multiplexing with multi-core fiber (MCF) is proposed. It relates to a technical field of distributed optical fiber sensing. The present invention maintains the advantage of single-ended measurement in the standard DAS system, and realizes the intensity accumulation of the Rayleigh backscattering light within each core of the MCF, which can greatly improve the strain resolution of DAS systems. Moreover, the introduction of optical switch can make different code sequences transmit in the different core of the MCF simultaneously, which can make the single-pulse response with coding gain demodulated without sacrificing the frequency responding bandwidth. Furthermore, the utilization of space-division multiplexing can make multiple pulses with precious time delay transmit in the MCF simultaneously, which can greatly improve the frequency responding bandwidth of DAS system.

Abstract: A long-distance FODAS amplification system includes a distributed amplification unit, which includes a LEAF, a pump, and a WDM; wherein the pump light passes through the WDM into the LEAF, so as to realize distributed amplification. A long-distance FODAS amplification method includes steps of: 1) modulating and amplifying a light source to obtain the probe pulse light; 2) guiding the pump light and the probe pulse light into LEAF; 3) combining the probe pulse light with the pump light to perform distributed amplification, so as to generate power-raised Rayleigh backscattered light; and 4) converting and demodulating the Rayleigh backscattered light after being output through the circulator, so as to complete distributed sensing.

Abstract: A high-voltage n-channel high electron mobility transistor (HEMT) device is provided. In view of a relatively high process difficulty in preparing super junctions on heterojunction devices such as HEMT, the high-voltage n-channel HEMT device provides a surface super junction structure for an n-channel HEMT device. A comb-finger-shaped p-type semiconductor strip block is prepared on a surface of a drift region of the high-voltage n-channel HEMT device, and the p-type semiconductor strip block is electrically connected to a source electrode, so that large-range depletion of a channel of the drift region is realized under a turn-off condition, and a depletion region tolerates a high voltage, thus enhancing a breakdown characteristic of the high-voltage re-channel HEMT device.

Abstract: A method for machine reading comprehension includes: S1, obtaining a character-level indication vector of a question and a character-level indication vector of an article; S2, obtaining an encoded question vector and an encoded article vector; S3, obtaining an output P1 of a bidirectional attention model and an output P2 of a shared attention model; S4, obtaining an aggregated vector P3; S5, obtaining a text encoding vector P4; S6, obtaining global interaction information between words within the article; S7, obtaining a text vector P5 after using the self-attention model; S8, obtaining aggregated data P6 according to the text encoding vector P4 and the text vector P5; S9, obtaining a context vector of the article according to the aggregated data P6 and an unencoded article vector P; and S10, predicting an answer position according to the context vector of the article and the encoded question vector to complete the machine reading comprehension.

Abstract: A method for reserving and allocating resources for an ultra-low-latency uplink service flow based on an air interface slice includes: virtualizing an air interface resource of a base station side into an ultra-low-latency slice resource and a non-ultra-low-latency slice resource; recording a collision situation on reserved resources in each retry window, and dynamically adjusting a size of the reserved ultra-low-latency slice resource; after detecting that a terminal transmits ultra-low-latency data on the ultra-low-latency slice resource, performing a resource reallocation and determining whether an idle resource is presented; if presented, allocating the idle resource to the terminal transmitting the ultra-low-latency data and returning the borrowed non-ultra-low-latency slice resource after transmitting the ultra-low-latency data; and if not presented, borrowing the non-ultra-low-latency slice resource allocated to a non-ultra-low-latency terminal and returning the borrowed non-ultra-low-latency slice res

Abstract: A pedestrian adaptive zero-velocity update point selection method based on a neural network, including the following steps: S1, collecting inertial navigation data of different pedestrians in different motion modes; S2, preprocessing the inertial navigation data collected in the step S1, labeling the preprocessed data, and obtaining a training data set, a validation data set, and a test data set according to the preprocessed data and a label corresponding to the preprocessed data; S3, inputting the training data set to a convolutional neural network for training, obtaining a pedestrian adaptive zero-velocity update point selection model based on the convolutional neural network, and using the validation data set to validate the pedestrian adaptive zero-velocity update point selection model; and S4, inputting the test data set into the pedestrian adaptive zero-velocity update point selection model based on the convolutional neural network, and obtaining a selection result of pedestrian zero-velocity update poi

Abstract: An integrated power semiconductor device, includes devices integrated on a single chip. The devices include a vertical high voltage device, a first high voltage pLDMOS device, a high voltage nLDMOS device, a second high voltage pLDMOS device, a low voltage NMOS device, a low voltage PMOS device, a low voltage NPN device, and a low voltage diode device. A dielectric isolation is applied to the first high voltage pLDMOS device, the high voltage nLDMOS device, the second high voltage pLDMOS device, the low voltage NMOS device, the low voltage PMOS device, the low voltage NPN device, and the low voltage diode device. A multi-channel design is applied to the first high voltage pLDMOS device, and the high voltage nLDMOS device. A single channel design is applied to the second high voltage pLDMOS device.

Abstract: A reflection-type coherent optical communication system combined with unidirectional optical signal amplification, comprises a polarization controller, a polarization beam splitter, a polarization maintaining optical circulator, an In-line polarizer, an optical modulator, a photoelectric converter, an electrical comparator, an optical amplifier, a laser, a coupler, a reflection end and a coherent receiver. A light source is disposed at a receiving end, and the laser emits an optical carrier. The optical carrier is transmitted through the coupler and an optical fiber. Thereafter, the polarization state of the optical carrier is controlled by two ways, the optical carrier passes through the polarization controller in a first way, and two beams of light are output by the polarization beam splitter. A beam of light with high-power is modulated through a first branch, and the modulation signal is returned along an original optical path.

Abstract: A memristor-reconstructed near-infrared SPR biosensor with adjustable penetration depth includes a prism, a first non-conductive dielectric film layer, a metal film layer, a second non-conductive dielectric film layer and a conductive dielectric film layer, wherein the prism is configured to generate an ATR (Attenuated Total Reflections) attenuation evanescent wave; the first non-conductive dielectric film layer, the metal film layer, and the second non-conductive dielectric film layer define a sensing unit for achieving a basic sensing function; the metal film layer, the second non-conductive dielectric film layer and the conductive dielectric film layer define a memristive unit; a voltage applying device is provided between the first electrode and the second electrode for applying a bias voltage to the memristive unit so as to realize infrared memristive reconfiguration.

Abstract: A compound double coaxial line atmospheric pressure low-temperature microwave plasma jet source includes an outer coaxial line, and an inner coaxial line arranged inside the outer coaxial line. The outer coaxial line includes a tube body. A metal tube is arranged in the tube body. A short-circuit plunger is arranged at the bottom of the metal tube. The inner coaxial line includes a needle electrode, and the needle electrode is arranged in the metal tube. A first gas inlet is arranged on the tube body, and the first gas inlet is connected between the tube body and the metal tube. A second gas inlet is arranged at the bottom of the metal tube, and the second gas inlet is connected between the metal tube and the needle electrode. The tube body is further provided with a microwave input port, and the microwave input port is connected to the metal tube.

Abstract: A reflection-type coherent optical communication system combined with unidirectional optical signal amplification, comprises a polarization controller, a polarization beam splitter, a polarization maintaining optical circulator, an In-line polarizer, an optical modulator, a photoelectric converter, an electrical comparator, an optical amplifier, a laser, a coupler, a reflection end and a coherent receiver. A light source is disposed at a receiving end, and the laser emits an optical carrier. The optical carrier is transmitted through the coupler and an optical fiber. Thereafter, the polarization state of the optical carrier is controlled by two ways, the optical carrier passes through the polarization controller in a first way, and two beams of light are output by the polarization beam splitter. A beam of light with high-power is modulated through a first branch, and the modulation signal is returned along an original optical path.

Abstract: A pipette based on surface charges includes a pipette body. A plurality of support rods are provided below the pipette body. Connecting rods are provided at the lower ends of two adjacent support rods. A substrate is provided between the connecting rods. A porous SiO2 coating is provided on the substrate. A hydrophobic molecule layer is provided on the surface coating by the vapor deposition method. A superamphiphobic surface is formed on the substrate by the surface coating and the hydrophobic molecule layer. The substrate and the surface coating are made of dielectric materials. A circular limit plate is provided above the pipette body. The pipette body, the support rods, the connecting rods and the limit plate are integrally formed, and are electrically non-conductive. An electrically conductive sliding rod is movably provided within the pipette body and the limit plate.

Abstract: A copper nanocatalyst, a method for preparing the copper nanocatalyst, and an application of the copper nanocatalyst in the synthesis of acetate or ammonia are provided. The copper nanocatalyst includes a substrate and an active agent loaded on the substrate. The method includes: preparing a cleaning agent by using an ethanol and a deionized; immersing the active agent in the cleaning agent, ultrasonically cleaning for 5-10 min at a frequency of 4×104 Hz-8×104 Hz, and drying for later use; mixing the cleaned active agent and a conductive binder according to a mass ratio of 1:19-9:1 of the active agent to the conductive binder, adding the ethanol, and fully stirring and dispersing to obtain a slurry; coating the slurry on a surface of the carbon paper, and drying the carbon paper by blowing through nitrogen flow to obtain the catalyst.

Abstract: A transient response enhancement circuit for buck-type voltage converters, wherein, the transient load changing detecting module detects the output voltage of the buck-type voltage converter. The first control signal is generated when the increase of the output voltage is detected, and the second control signal is generated when the decrease of the output voltage is detected, thereby self-adaptively detecting the time of the buck-type voltage converter in response to the load changing. The compensation voltage predicting operation module predicts and adjusts the compensation voltage and the adjusted compensation voltage is superimposed on the buck-type voltage converter through the internal active compensation module to adjust the duty ratio of the buck-type voltage converter. The drive controlling insertion logic module can further improve the response speed.

Abstract: A method for preparing a lithium alloy as an anode material includes the following steps: heating lithium metal into a molten state in an environment with a dew point not higher than ?50° C. and an oxygen content not higher than 10 ppm; adding a transition metal to the molten lithium metal, maintaining the temperature for 5-15 minutes, and uniformly mixing to form a molten alloy; cooling the molten alloy to room temperature to obtain the lithium alloy as the anode material. The preparation method of the present invention is simple and feasible with less cost. The prepared lithium alloy as the anode material can effectively improve the coulombic efficiency and cycle lifespan of the lithium battery.

Abstract: A method is for analyzing the correlation between different line loss actions, which records, for each individual to which line loss actions occur, all the line loss actions that occur to the individual; and counts, based on two categorization manners: by individual and by line loss action, line loss actions recorded in the database, to obtain line loss action counting results corresponding to respective categorization manners; then, based on the two counting results, collects respective multi-line loss action sequences; and acquires probability data as a data source for probability calculation, to obtain line loss action occurrence conditional probabilities for different line loss actions, so that a targeted a targeted loss reduction plan can be formulated.

Abstract: The present invention relates to the technical field of superlattice magneto-optical material technologies, and in particular, to a superlattice material, and a preparation method and application thereof. According to description of embodiments, the superlattice material provided in the present invention has both a relatively good magnetic property of a ferrous garnet material and a good photoelectric absorption characteristic of a two-dimensional semiconductor material such as graphene. Magneto-optical Kerr effect data obtained through testing shows that: A saturated magneto-optical Kerr angle of the superlattice material in the present invention is 13 mdeg in a magnetic field of 2500 Oe, and a magneto-optical Kerr angle of the superlattice material is increased by 2.5 times compared with a nonsuperlattice ferrimagnetic thin film material into which no two-dimensional material is inserted, thereby achieving magneto-optical effect enhancement.

Abstract: A three-layer self-healing flexible strain sensor includes: a self-healing sensitive layer, wherein a self-healing encapsulating layer is respectively placed on an upper surface and a lower surface of the self-healing sensitive layer. The self-healing sensitive layer comprises a doped carbon material or a conductive composite. The three self-healing layers of the self-healing strain sensor can quickly repair the internal and external damage caused by the layered structure in a short period of time after the external damage, and does not require external stimulation. The three-layer self-healing structure strain sensor is simple in preparation without using a repair agent, which can achieve rapid self-repair at the room temperature, and can be repeatedly repair. The three-layer self-healing structure increases the strength and modulus of the strain sensor as well as increases the ability of the strain sensor to resist external damage.

Abstract: A two-way wireless relay transmission method based on network coding is provided, wherein two end nodes and n relay nodes (wherein n?2) which form a two-way wireless relay (TWRN) are divided into three different categories, so that any two nodes in a same category are separated by at least two relay nodes belonging to other different categories, and in a same timeslot, only nodes belonging to one category are allowed to transmit data packets and nodes of the other two categories should keep silent. As a result, the mutual interference caused by the simultaneous transmission of data packets between adjacent nodes is effectively avoided, and the mutual interference caused by the simultaneous transmission of data packets by the nodes belonging to a same category is reduced.

Abstract: A method for preparing a pyroelectric polymer film based on a combined process of solution casting and uniaxial stretching is disclosed. The pyroelectric polymer film is firstly prepared by solution casting, afterwards, the casted film is subjected to uniaxial stretching when the film is in a semi-cured state (wet film). Thus a larger stretching ratio (>10) at a lower temperature (even at room temperature) is realized. Without undergoing a further poling process, the as-stretched film does have a fairly, good pyroelectric performance. Moreover, the surface of the stretched film is smoother and has fewer surface defects.