Abstract: A labyrinth sealing device for reducing gas intrusion is provided. A sealing bush is provided with a jet hole at the front of a tooth tip gap. The jet hole faces a tip of a corresponding sealing tooth. A gas flow injected by the jet hole suppresses hot gas flowing into the tooth tip gap. The sealing bush is provided with a first intercepting member at the rear of the tooth tip gap, and the sealing tooth is provided with a second intercepting member at the rear of the tooth tip gap. The first intercepting member hinders hot gas flowing against an inner wall of the sealing bush, and the second intercepting member hinders hot gas flowing against the sealing tooth, such that a part of the hot gas flows in a reverse direction and is violently mixed with subsequent hot gas.

Abstract: A Quantum Digital Signature (QDS)-based mail system and a transceiving method are provided. The system is a three-layer structure formed by a physical layer, a key layer, and an application layer. The physical layer is a key generation terminal and is used to generate a key string for signature in real time; the key layer is used to store the key string generated by the physical layer and provide a required key to the upper layer, namely, the application layer when required; and the application layer is a transceiving software part in the mail system, and is used to extract keys generated by the physical layer from the key layer so as to encrypt information to be sent. The mail transceiving method comprises: a quantum key distribution (QKD) phase, a mail signature phase, and a signature verification phase.

Abstract: The present disclosure relates to a semantic segmentation method and system for a remote sensing image fusing GIS data. The method includes: obtaining a first remote sensing data training set and first GIS data; preprocessing the first remote sensing data training set to obtain a second remote sensing data training set; preprocessing the first GIS data based on the second remote sensing data training set to obtain second GIS data; performing data enhancement on the second remote sensing data training set to obtain a third remote sensing data training set; training a semantic segmentation model based on the third remote sensing data training set and the second GIS data; and performing semantic segmentation on the remote sensing image to be segmented based on the first GIS data and the trained semantic segmentation model to obtain a semantic set.

Abstract: The present invention provides a device for collecting photos of a field surface feature and an information measurement and calculation method. The photo collection device includes a motion camera, a pan-tilt, and a movable carrier. The motion camera is fixed to the movable carrier by using the pan-tilt, and when the movable carrier is in a driving process, the motion camera regularly takes a clear and measurable surface feature photo, to obtain a set of continuous surface feature photos with geographical coordinates. The device for collecting photos in the present invention is portable, is easily assembled, and can stably and continuously take clear and measurable photos, to resolve a problem that a photo taken in a high-speed motion state is fuzzy. The device can be applied to remote sensing of large-scale field research.

Abstract: Disclosed is application of acetylacetone in inhibiting the growth of cyanobacteria, that is, acetylacetone is added in water disturbed with cyanobacteria, and the dosage of acetylacetone is not less than 7 mg/L to inhibit the growth of cyanobacteria. Acetylacetone inhibits the growth of cyanobacteria by inhibiting photosynthesis, has a better algicidal effect than common algaecides, is harmless to common bacteria such as Escherichia coli, Salmonella, Bacillus subtilis, and Staphylococcus aureus, and is environmentally friendly and easy to popularize and apply.

Abstract: An active folding wind turbine capable of resisting severe typhoons is provided. Each wind turbine blade includes an upper blade part and a lower blade part that are hinged to each other by a hinge device. A motor transmission system is installed in the lower blade part, is connected to the hinge device in a transmission manner, and can drive the upper blade part to rotate relative to the lower blade part through the hinge device, so that the wind turbine blade is bent. When the upper blade part rotates to an end of a travel, a blade tip of the upper blade part is propped against an upper end of the lower blade part of an adjacent wind turbine blade. A winch is built in an upper portion of the lower blade part of the wind turbine blade, and is provided with a cable.

Abstract: A method for preventing a differential cryptanalysis attack is provided. The method is implemented by an adaptive scan chain, a control module, and a plaintext analysis module. The plaintext analysis module controls the adaptive scan chain, so that two plaintexts differing in the last bit of only one byte are input through scan chains with different structures. Consequently, the two input plaintexts for which differential cryptanalysis attack technology originally can be used to crack the key are unable to generate outputs that can be used by the differential cryptanalysis attack technology.

Abstract: Disclosed are an intelligent separation and drying system for maggots and a method of operating the same. The intelligent separation and drying system includes an intelligent light control unit, an intelligent scraping unit, a separation unit, a drying unit, a travelling unit and a central control unit. The central control unit is connected to other units through signals. Multidisciplinary techniques, including spectrum analysis, machine learning algorithm and artificial neural network, are combined to automatically, systematically, intelligently and continuously separate maggots and maggot feed as well as dry the maggots with high efficiency in a clean manner.

Abstract: This patent studies a scale-span modeling method to simulate the structural mechanical responses and dynamic progressive failure behaviors of carbon fiber reinforced plastics (CFRPs) in drilling. Firstly, considering the different mechanical behaviors of fiber and matrix in micro state, a three-dimensional multi-scale dynamic progressive damage evolution model based on micro failure theory is proposed. Based on the degradation elastic parameters of microcomponent in typical volume element model, a new damage evolution model of fiber and resin matrix and an auxiliary deletion criterion of failure element are proposed. Secondly, the relationship between the macro stress and the micro stress of representative volume element in the composite model is established by using the stress amplification factor. Combined with the bilinear cohesion element model, the damage behavior of the composite in and between layers under the cutting action of dagger drill is simulated.

Abstract: The invention relates to a method for preparing a composite metal oxide hollow fibre. A certain stoichiometry of composite metal oxide raw material and a polymer binding agent are added to an organic solvent, and mixed mechanically to obtain an evenly dispersed spinning solution having a suitable viscosity. After defoaming treatment, the spinning solution is extruded through a spinneret and, after undergoing a certain dry spinning process, enters an external coagulation bath; during this period, a phase inversion process occurs and composite metal oxide hollow fibre blanks are formed. The blanks are immersed in the external coagulation bath and the organic solvent is displaced; after natural drying, the blanks undergo a heat treatment process; during this period, polymer burn off, in situ reaction, and in situ sintering processes occur to obtain the composite metal oxide hollow fibre.

Abstract: A calibration method for fringe projection systems based on plane mirrors. Firstly, two mirrors are placed behind the tested object. Through the reflection of mirrors, the camera can image the measured object from the front and other two perspectives, so as to obtain 360-degree two-dimensional information of the measured object. The projector projects three sets of phase-shifting fringe patterns with frequencies of 1, 8, and 64. The camera captures the fringe image to obtain an absolute phase map with a frequency of 64 by using the phase-shifting method and the temporal phase unwrapping algorithm. By using the calibration parameters between the projector and the camera, the absolute phase map can be converted into three-dimensional information of the measured object. Then, the mirror calibration is realized by capturing a set of 3D feature point pairs, so that the 3D information from different perspectives is transformed into a unified world coordinate system.

Abstract: A method for vehicle detection based on single-axis geomagnetic sensor is disclosed. The method includes the following: arranging two geomagnetic sensors in tandem at a fixed distance in the same lane, and acquiring, by the two geomagnetic sensors, data when a vehicle passes by; performing data cleansing and denoising on the data acquired by the geomagnetic sensors; detecting, by the geomagnetic sensors, the vehicle by using an state machine algorithm based on a fixed threshold, and extracting moments when the vehicle enters and leaves detection ranges of the sensors; and collecting statistics on traffic flow in a predetermined period of time, and calculating the velocity and length of the vehicle. The presently disclosed method and apparatus can be independently used to obtain vehicle parameters at important traffic sections or intersections, or can be used in combination with other traffic detection devices to obtain more comprehensive traffic information.

Abstract: An inspection device for subway tunnel based on three-dimensional laser scanning includes a three-dimensional laser scanner, an adaptive structure of a track trolley, a power control module for the track trolley, a photoelectric sensor and a body of the track trolley. The power control module is arranged on the body. A support rod is vertically arranged on the power control module, and the three-dimensional laser scanner is mounted at a top of the support rod. The adaptive structure is symmetrically arranged at two sides of the body of the track trolley, and the photoelectric sensor is arranged in the body of the track trolley. The inspection device is designed to be modular, which is convenient to carry and repair, and easy to mount. In addition, the inspection device has low labor cost due to less manual intervention, and the inspection efficiency can be improved.

Abstract: The invention discloses a spatial and temporal feature-based method for measuring domestic wastewater effluent loadings, comprising the following steps: establish a model for measuring regional domestic wastewater effluent loadings; calculate regional population distribution raster data; obtain per capita effluent loading coefficients with spatial and temporal differences; calculate regional domestic wastewater effluent loadings; and compare and analyze the temporal fluctuation features and spatial variation features of regional domestic wastewater effluent loadings and identify “hotspot” periods and areas of effluent loadings. Compared with the prior art, the method for measuring domestic wastewater effluent loadings provided by the present invention is flexible, convenient and highly universal, which can significantly raise the temporal-spatial resolution of the pattern of regional domestic wastewater effluent loadings. The data needed are also publicly available.

Abstract: An active feedback control method for a quantum communication system based on machine learning is disclosed. In the transmission process of a quantum key distribution system, the present invention uses a pre-trained double-layer LSTM network to predict, according to a real-time ambient temperature, humidity and laser light intensity fluctuation, as well as voltage changes in the past moment, a zero-phase voltage value of a phase modulator at a receiving end at the next moment, and updates the network at a fixed time interval, so that the LSTM network can accurately predict for a long time, ensuring that the quantum key distribution system operates stably and efficiently for a long time. The present invention greatly improves the transmission efficiency of the quantum key distribution system by method of active prediction and feedback control.

Abstract: The invention discloses a fabrication process variation analysis method of a silicon-based Mach-Zehnder electro-optic modulator. The method includes the following steps: (1) use the input reflection coefficient S11 to characterize and quantify the reflection deviation characteristics of the driving signal on the traveling wave electrode; (2) measure and quantify the modulated signal characteristics of the silicon Mach-Zehnder electro-optic modulator. The modulated signal characteristics include transmission characteristics, vertical direction characteristics and horizontal direction characteristics; (3) Pearson correlation coefficient and partial correlation coefficient are introduced. By analyzing the value and variation trend of Pearson correlation coefficient and partial correlation coefficient, the relationship between the deviation of the driving signal reflection and the deviation of the modulated signal characteristics is analyzed.

Abstract: A vehicle clustering method includes: acquiring vehicle dynamic information, the vehicle dynamic information including vehicle positions and vehicle speeds; clustering vehicles based on the vehicle dynamic information; calculating, based on the vehicle dynamic information, a link reliability and a link stability of the vehicles in a cluster; calculating, based on the link reliability and the link stability, a selection priority index for a cluster head; and selecting a vehicle with a largest selection priority index in the cluster as a cluster head.

Abstract: A state monitoring method for vibration drilling of a stack structure material is provided. A load power and a torque value of a drilling spindle is monitored during machining. Drilling state are divided according to a machining material of a drill. According to a data of a test library, reference thresholds of two monitoring objects for judging the change of the drilling state are set to achieve the state monitoring for the drilling process. The method monitors the machining process through the monitoring module in the machining system.

Abstract: Provided are a method for promoting the lipolysis and fatty acid oxidative metabolism in mammals or cells derived from mammals, a method for downregulating the fat content and the weight of a mammalian body, as well as a method for increasing the intracellular cAMP concentration, increasing the phosphorylation degree and the activity of the hormone-sensitive esterase HSL, enhancing the transcription activity of PPAR alpha and increasing the activities of enzymes involved in a fatty acid beta oxidation process. By simulating the expression of a protein corresponding to a gene responsible for the phosphorylation of the Fas-associated death domain protein, or treating and acting on mammals or cells derived from mammals with a material that can increase the phosphorylation degree of the Fas-associated death domain protein, said methods increases the phosphorylation of the Fas-associated death domain protein.

Abstract: Use of microcystins having a monocyclic heptapeptide structure in preparation of drugs for preventing or treating organ and tissue fibrosis diseases. Preferably, the microcystins are microcystin-LR with amino acids at positions 2 and 4 of a monocyclic heptapeptide structure thereof being leucine and arginine respectively, or are microcystin-RR with amino acids at positions 2 and 4 thereof being both arginine. Also provided is a method for inhibiting myofibroblast differentiation and collagen synthesis. The method is implemented by inhibiting a TGF-?/Smad signaling pathway by using one or more microcystins.