Abstract: Disclosed are an ergonomic evaluation method and simulation system based on virtual-real fusion. The system includes a user and device module, a virtual scene building module, and a data processing and analysis module. The method includes: obtaining real-time human joint point position data by means of a human motion capturing device, generating a character model of a current posture, and integrating the character model into a visual device and a personal computer (PC) terminal that are implanted with a virtual scene; obtaining comprehensive human joint point data through computation according to the real-time human joint point position data, and obtaining virtual scene data; and determining a human motion according to the comprehensive human joint point data and the virtual scene data, obtaining human posture data, obtaining human posture evaluation information through computation, and conducting analysis to determine whether an ergonomic evaluation index is rational.

Abstract: A source-grid-load-storage networked collaborative frequency control method is disclosed, which comprises acquiring total active power ?P to be regulated during a secondary frequency regulation process of a power grid; performing frequency regulation by source-grid-load-storage of the power distribution system, allocating power regulation capacities, and determining whether the desired total active power is met after the frequency regulation; if the desired total active power is met, determining whether power of power generation units is out of limit; if the power of the power generation units is not out of limit, keeping active power of the power distribution system in balance to complete frequency regulation of the power grid; if the power of the power generation units is out of limit, correcting the power regulation capacities of the power generation units of the source-grid-load-storage and compensating a power difference to keep the active power of the power distribution system in balance.

Abstract: Disclosed in the present application are an AC current sensor and a wireless charging chip. The AC current sensor includes an integrator circuit, a differentiator circuit, and a calibration circuit. The integrator circuit is configured to perform integration on a voltage on which filter processing is performed across an inductor in a TX coil. The differentiator circuit is configured to perform differentiation on a voltage on which filter processing is performed across a capacitor in the TX coil. The calibration circuit is configured to sample and compare output signals of the integrator circuit and the differentiator circuit, and adjust output results of the integrator circuit and the differentiator circuit until the output results are the same. In this case, the output result of the differentiator circuit may be used to calculation for a current flowing through the TX coil.

Abstract: According to a surveying and mapping instrument and method for a wide-area spatial channel map through multi-unmanned aerial vehicle (UAV) cooperation, a measurement signal emission unit generates and emits a measurement signal, a measurement signal multi-UAV cooperative receiving unit receives the measurement signal transmitted through a wireless channel, extracts an effective multipath component from the measurement signal, and frames the effective multipath component and corresponding time and location information for storage, and transmits stored channel data to a channel data fusion processing unit offline, and the channel data fusion processing unit fuses the channel data in terms of space, time, and frequency dimensions, and completes missing channel data to construct a complete wide-area spatial channel map.

Abstract: A method is provided for calculating gaseous diffusion and oxidation evolution of a ceramic matrix composite (CMC) structure, which includes determining temperature and load distribution in a structural member; determining matrix crack distribution in the structure; establishing an equivalent diffusion coefficient model of a fiber bundle scale to predict a gas flow channel in a fiber bundle: averaging a total amount of gaseous diffusion in the channel to establish the equivalent diffusion coefficient model of the fiber bundle composite scale related to the matrix crack distribution; establishing a representative volume element (RVE) model; establishing an equivalent diffusion coefficient model of a RVE scale; calculating the distribution of the gas concentration and oxidation products in the structure; calculating a growth thickness of an oxide at cracks and pores in each element; and updating sealing conditions of the gas channel, and calculating a new equivalent diffusion coefficient field and the distribut

Abstract: The present disclosure relates to a transmission structure and a preparation method thereof. The transmission structure includes a plurality of first transmission units and a plurality of second transmission units, and difference between a first transmission phase of a transmitted electromagnetic wave of the first transmission unit and a second transmission phase of a transmitted electromagnetic wave of the second transmission unit is the same or similar within a preset frequency range. The plurality of first and second transmission units are arranged randomly on a surface. The first transmission unit has a first matrix, a first medium block is disposed inside the first matrix, and a thickness of the first matrix between the first medium block and an electromagnetic wave incident surface of the first transmission unit is a non-zero first thickness.

Abstract: A conjugate may have formula (1), i.e., M-[(L1)a-(L2)b-(D)c] (1), wherein M is a biological macromolecule having a nucleophilic functional group, M is linked to L1 with the nucleophilic functional of M, D is a functional molecule, L2 is a linker, and L1 is a compound of formula 1 wherein R is —F or —OH, and L2 is linked to R1, R3 or R2, a is an integer of 1 to 10, b, c is each independently an integer of 0 to 10, provided that b and c are not simultaneously 0. R1, R2, and R3, may independently be H, optionally substituted alkyl, or optionally substituted aryl, and R1, may be H or isotope thereof ? C may link R1 and a C linking R2 form a ring.

Abstract: A preparation method and an application of a clay/tannic acid/metal ion composite material for efficient adsorption of antibiotics are provided, which relate to the field of water environment treatments. A clay/tannic acid/metal ion composite adsorbent is prepared, preparation method and operation process are simple, synthesis time is short, and yield is large. A raw material used is tannic acid, which has a wide range of sources, is non-toxic, biodegradable, and has no risk of secondary pollution, due to abundant phenolic hydroxyl groups in tannic acid, the tannic acid can not only chelate with the metal ions, but also adsorb pollutants from water, when combined with the clay and the metal ions, a composite body is formed, which has a rougher surface, and adsorption active sites are increased, thereby effectively increasing adsorption, and improving an adsorption performance for pollutants. The clay/tannic acid/metal ion composite adsorbent has good adsorption effect for antibiotics.

Abstract: A method and system for evaluating casualty caused by landslide chain disaster induced by heavy rain are provided. The method includes: obtaining historical landslide data, candidate influence factors and personnel traffic distribution data of an observation site; dividing the historical landslide data into a model construction sample group, a model verification sample group, and a model test sample group; obtaining an occurrence probability of landslide chain disaster of each spatial position in the observation site; determining a start-up landslide source region of the landslide chain disaster according to the model verification sample group and the occurrence probability; determining an affected region of the landslide chain disaster according to the start-up landslide source region; determining a personnel number exposed to the landslide chain disaster; and setting an event division threshold, and evaluating the number of casualties according to the event division threshold and the personnel number.

Abstract: Disclosed are an emergency control method and system based on source-load-storage regulation and cutback. According to the method, output power of power generating sources is regulated according to a power regulating quantity and a frequency regulation requirement, an output power compensation and output frequency of each power generating source are maintained within permissible ranges, so that a balance between power supply and demand of a power distribution network is maintained; and standby energy-storage power stations are used to make up a power gap, and an external power supply system is used to assist in making up a power deficiency, so that large load disturbance can be handled make up the power gap.

Abstract: The present invention belongs to the field of aqueous environmental treatment and specifically relates to a preparation method and application of a cellulose/lignin/clay composite aerogel for the efficient adsorption of antibiotics. Cellulose/lignin/clay composite aerogels were prepared by sol-gel, cross-linking, and freeze-drying methods, and the preparation method and operation process were simple and easy to reuse with a large yield. The raw materials used in the present invention are the natural polymer materials, cellulose, lignin, and clay minerals, which are widely available and non-toxic, cellulose and lignin are biodegradable and have no risk of secondary pollution. Cellulose can be used as the matrix of aerogels owing to its unique environmental friendliness, biodegradability, and excellent structural skeleton structure.

Abstract: Provided is a pattern division multiple access (PDMA) communication system based on optimal frequency-hopping patterns, which includes a transmitter and a receiver. The transmitter modulates an input baseband signal into a modulated signal, and then converts the modulated signal into a signal that hops in frequency according to the optimal frequency-hopping pattern. The receiver reverts the received frequency-hopping signal to an output modulated signal using an optimal frequency-hopping pattern same as that of the transmitter, and then demodulates the modulated signal into a baseband signal. The optimal frequency-hopping patterns are obtained by applying two-dimensional cyclic shift to a Golomb Costas array constructed based on an extension field, and thus are frequency-hopping patterns with ideal autocorrelation and cross-correlation properties.

Abstract: An electrowetting effect-based solar-driven high efficiency humidification system and a working method. A photovoltaic power generation module and an electrowetting high efficiency humidification module are combined, which conform to a solar energy transfer principle in a PV/T device, while liquid droplets are also sprayed at regular intervals on an upper surface of a heat exchange flow channel in the PV/T device, the principles of acceleration of liquid droplet internal flow and a change to surface hydrophilicity/hydrophobicity by electrowetting technology are used, liquid drop evaporation is accelerated, and highly efficient humidification of air is achieved. By means of coupled utilization of electrowetting technology and a PV/T system, water is saved while a large amount of moist air and clean electric energy which can be used for actual production are obtained.

Abstract: The present disclosure provides a security authentication method, system and device for IoV communication based on a national cryptographic algorithm. The method of the present disclosure includes: constructing, by an on-board unit, an identity authentication request message for transmitting to a road side unit; receiving, by the on-board unit, an identity authentication response message, and verifying a signature; and if the verification is successful, calculating, by the on-board unit, a session key and a hash value thereof, and constructing an acknowledgment message for transmitting to the road side unit, where the acknowledgment message is used in calculating a session key and a hash value thereof by the road side unit for contrast verification; if hash values are equal, security authentication is successful and a session key is generated; and if the hash values are not equal, the security authentication is failed.

Abstract: The present disclosure belongs to the technical field of Internet of vehicles (IoV) security and provides an IoV intrusion detection method and device based on an improved convolutional neural network. The method of the present disclosure includes: collecting original data of data traffic during IoV communication, and inputting the original data to a data dimension reduction algorithm model for IoV intrusion detection for preprocessing to obtain standardized data for IoV data analysis; inputting the standardized data for IoV data analysis to an improved convolutional neural network model for calculation, including: performing convolutional calculation and nonlinear activation on the input data for layering; performing two convolutional operations, two pooling operations and one full connection operation on each layer of data; and classifying a data set output by the improved convolutional neural network model through a SoftMax layer.

Abstract: Provided are an imaging method and apparatus, and a medium. The method includes: for a target field of view, performing photographing and quantification at a first resolution, to obtain a first image that has a first bit width; for the target field of view, performing photographing and differential processing at a second resolution, to obtain a second image that has a second bit width, wherein the differential processing includes: for a pixel point obtained by photographing at the second resolution, quantifying the difference between the pixel point and a neighboring pixel point of the pixel point, to obtain a quantified difference a value of a corresponding pixel point in the second image; and fusing the first image with the second image, to obtain a third image, wherein the first resolution is lower than the second resolution, and the first bit width is higher than the second bit width.

Abstract: A nozzle-replaceable printing head for continuous fiber printing and a printing method are provided. The printing head includes a fixed bracket, a wire feeding module located at an upper part of the structure, an upper guide pipe, a shearing module located at a middle part of the structure, a lower guide pipe, a heat dissipation sleeve, a throat pipe, a heating coil, and a nozzle module located at a bottom of the structure, where a continuous fiber reinforced thermoplastic resin matrix pre-impregnated composite wire coaxially penetrates through the other side of the printing head from top to bottom and is fed for printing. An adjustment groove with scales is configured to standardize adjustment on clamping and feeding states of pre-impregnated composite wires of different specifications.

Abstract: An optimization method for turbines of a thermal power unit based on sparse big data mining in the technical field of turbine optimization. The optimization method comprises: acquiring historical operating data of a unit; selecting a set of controllable operating parameters highly correlated with the heat rate of turbines as optimized parameters; constructing a new sparse data-oriented pattern-growth association rule mining algorithm based on binary matrixes and the hyperlink technique; proposing a load balancing strategy based on matrix operation on an Apache Spark platform, and parallelly implementing the global calculation-balanced pattern-growth association rule mining algorithm; and discretizing the historical operating data by clustering, parallelly mining the discretized historical operating data to obtain an association rule, and performing de-discretization to obtain target values of the optimized parameters of the turbines under boundary conditions.

Abstract: Embodiments of the present disclosure provide a detection device for laser spot welding micro-weld spot quality based on laser ultrasound. The device includes: a nanosecond pulsed laser configured to emit a laser; the polarizing beam splitter configured to perform a laser beam splitting, wherein a laser beam after performing the laser beam splitting by the polarizing beam splitter enter an energy detector and a beam splitter mirror, respectively; the beam splitter mirror configured to perform the laser beam splitting on the laser entering the beam splitter mirror, wherein a laser beam after performing the laser beam splitting enter a photodetector and a light reflecting mirror, respectively; an aperture configured for the laser beam passing through the light reflecting mirror, the laser passing through a scanning galvanometer to reach a multi-axis displacement platform; the multi-axis displacement platform configured to place and/or move a sample.

Abstract: A path planning method based on dynamic contour offset discretization and for spatial curved-surface printing is provided. Firstly, transversal equal slicing is carried out on a target model, and single/double contours are labeled; secondly, central slicing is carried out on the model, curvature contours are discretized, feature values of contour offsets of slice layers are calculated on the basis of a surface contour curvature of the model, and dynamic offset filling for inner contours of horizontal slices is realized; then longitudinal equal slicing is carried out on the slices, and spatial discrete points of the target model are obtained; and finally, virtual double contours are constructed for the single contours, and labeling processing for the discrete points is carried out, so that a discretized three-dimensional spatial equidistant lattice of the target model is obtained.