Abstract: A blocking signal cancellation low noise amplifier system includes a first low noise amplifier, a second low noise amplifier, a blocking signal extraction and bias generation circuit, a bias switching circuit, and a bias switching signal generating circuit. The first low noise amplifier is used for dynamic input matching, and the first low noise amplifier receives an input signal and outputs it after amplifying. The blocking signal extraction and bias generation circuit is used to extract a blocking signal from the output signal of the first low noise amplifier, and output a DC voltage signal. The bias switching circuit is used to switch the first low noise amplifier between a blocking mode and a small signal mode. The bias switching signal generating circuit is used to compare the DC bias voltage signal VB2 with a preset reference voltage signal Vref.

Abstract: A data sparse projection method, includes: randomly initializing a high-dimensional sparse two-dimensional matrix (S1); fixing the high-dimensional sparse two-dimensional matrix, and calculating an optimal output variable by using the high-dimensional sparse two-dimensional matrix (S2); fixing the optimal output variable, and calculating an optimal high-dimensional sparse two-dimensional matrix by using the optimal output variable (S3); and cyclically fixing the high-dimensional sparse two-dimensional matrix and the output variable until the optimal output variable is no longer increased when the high-dimensional sparse two-dimensional matrix is fixed (S4).

Abstract: The present disclosure provides a method of preparing unsaturated hydrocarbons by black body photocatalytic (thermal radiative catalytic) conversion of saturated hydrocarbons. In this method, a saturated hydrocarbon reaction gas is introduced into a reaction furnace, and the saturated hydrocarbon is catalyzed to convert under heating and illumination conditions to prepare the unsaturated hydrocarbons. The photocatalysis is combined to the conventional thermal catalysis to improve the catalytic performance, accelerate the reaction speed, increase the conversion rate, and/or improve the selectivity of the catalytic reaction.

Abstract: The present disclosure provides a humidity-stiffening polymer material, and a preparation method therefor and a use thereof. The humidity-stiffening polymer material includes the following raw materials: a monomer, an ionic liquid, a salt, a cross-linking agent and an initiator, wherein the monomer includes benzyl methacrylate, the ionic liquid includes an imidazole-based ionic liquid, and the salt includes a hygroscopic salt. The method for preparing the humidity-stiffening polymer material includes: mixing the raw materials to obtain a precursor liquid, performing reaction on the mixture after degassing, and drying the mixture to obtain the humidity-stiffening polymer material. The humidity-stiffening polymer material is applied to actuators, soft robots and wearable biomedical devices based on bionic design.

Abstract: A blocking signal cancellation low noise amplifier system includes a first low noise amplifier, a second low noise amplifier, a blocking signal extraction and bias generation circuit, a bias switching circuit, and a bias switching signal generating circuit. The first low noise amplifier is used for dynamic input matching, and the first low noise amplifier receives an input signal and outputs it after amplifying. The blocking signal extraction and bias generation circuit is used to extract a blocking signal from the output signal of the first low noise amplifier, and output a DC voltage signal. The bias switching circuit is used to switch the first low noise amplifier between a blocking mode and a small signal mode. The bias switching signal generating circuit is used to compare the DC bias voltage signal VB2 with a preset reference voltage signal Vref.

Abstract: The present disclosure provides a humidity-stiffening polymer material, and a preparation method therefor and a use thereof. The humidity-stiffening polymer material includes the following raw materials: a monomer, an ionic liquid, a salt, a cross-linking agent and an initiator, wherein the monomer includes benzyl methacrylate, the ionic liquid includes an imidazole-based ionic liquid, and the salt includes a hygroscopic salt. The method for preparing the humidity-stiffening polymer material includes: mixing the raw materials to obtain a precursor liquid, performing reaction on the mixture after degassing, and drying the mixture to obtain the humidity-stiffening polymer material. The humidity-stiffening polymer material is applied to actuators, soft robots and wearable biomedical devices based on bionic design. The present disclosure provides a humidity-stiffening polymer material, and a preparation method therefor and a use thereof.

Abstract: The present disclosure provides a method of preparing unsaturated hydrocarbons by black body photocatalytic (thermal radiative catalytic) conversion of saturated hydrocarbons. In this method, a saturated hydrocarbon reaction gas is introduced into a reaction furnace, and the saturated hydrocarbon is catalyzed to convert under heating and illumination conditions to prepare the unsaturated hydrocarbons. The photocatalysis is combined to the conventional thermal catalysis to improve the catalytic performance, accelerate the reaction speed, increase the conversion rate, and/or improve the selectivity of the catalytic reaction.

Abstract: The present disclosure relates to the field of dielectric elastomers. In particular, provided are a dielectric elastomer precursor fluid, a preparation method therefor and the use thereof, a dielectric elastomer composite material, a flexible device, and a light-emitting device. The dielectric elastomer precursor fluid comprises an elastomer matrix, an ionic liquid and a solvent, wherein the volume fraction of the ionic liquid and the solvent is 5-45%. The dielectric elastomer precursor fluid has the advantages of a high conductivity, a high transparency and a good fluidity, and is beneficial for preparing a dielectric elastomer composite material having a high dielectric constant, a low elastic modulus and a high optical transparency, thus fully solving the problem that a high dielectric constant cannot be balanced with a low elastic modulus and a high optical transparency in a dielectric elastomer.

Abstract: A push-push frequency doubler based on complementary transistors is provided. The first differential amplifier circuit receives a differential input signal having an initial frequency, and amplifies the amplitude of the second harmonic of the differential input signal to obtain a first signal. The second differential amplifier circuit receives the differential input signal with the initial frequency and amplifies the amplitude of the second harmonic of the differential input signal to obtain the second signal. Where, the first signal and the second signal are a set of differential signals with the same amplitude and a phase difference of 180°. The output load circuit extracts the second harmonic signal in the first and second signal respectively to obtain and output a pair of differential output signal with first output frequency whose value is twice of the initial frequency. As a result, the frequency doubler with differential output signal is realized.

Abstract: Provided are a transmission line module for a rotary traveling wave oscillator (RTWO) and a design method thereof. The transmission line module includes a substrate. The upper surface of the substrate is provided with a grounding metal layer, that is, a metal ground. The metal ground is provided with a rectangular groove. The rectangular groove penetrates front and rear sides of the metal ground along a length direction of the rectangular groove. The thickness of the rectangular groove is the same as the thickness of the metal ground. The rectangular groove is filled with a silicon dielectric plate that has the same shape and size as the rectangular groove. The upper surface of the silicon dielectric plate is provided with two parallel transmission lines along the length direction of the rectangular groove.

Abstract: The present disclosure relates to the field of dielectric elastomers. In particular, provided are a dielectric elastomer precursor fluid, a preparation method therefor and the use thereof, a dielectric elastomer composite material, a flexible device, and a light-emitting device. The dielectric elastomer precursor fluid comprises an elastomer matrix, an ionic liquid and a solvent, wherein the volume fraction of the ionic liquid and the solvent is 5-45%. The dielectric elastomer precursor fluid has the advantages of a high conductivity, a high transparency and a good fluidity, and is beneficial for preparing a dielectric elastomer composite material having a high dielectric constant, a low elastic modulus and a high optical transparency, thus fully solving the problem that a high dielectric constant cannot be balanced with a low elastic modulus and a high optical transparency in a dielectric elastomer.

Abstract: A terminal, a storage medium, and a database synchronization method thereof are disclosed. The database synchronization method includes reading data from a first database and capturing a dynamic data log in the first database; joining data to a waiting queue read from the first database; determining a dislocation category of the data in the waiting queue, and rearranging the dislocation data in the waiting queue into a first category according to the dynamic data log; and synchronizing the rearranged data to a second database. According to the database synchronization method provided by the present invention caches the data read from the first database to the waiting queue, and dislocation data in the waiting queue is rearranged and then synchronized to the second database, so that a problem of poor data identity after database synchronization is avoided.

Abstract: A multi-functional spintronic logic gate device. The device comprises: a magnetic tunnel junction. the magnetic tunnel junction sequentially comprising a reference layer. a tunneling insulation layer, and a free layer from a top layer to a bottom layer, and a separation layer being arranged on at least one side of the two sides of the free layer; a bottom electrode, adjacent to and in contact with the bottom layer of the magnetic tunnel junction and made of a heavy metal material, the periphery of the bottom electrode being coupled to first and second terminals. the first and second terminals being opposite to each other with respect to the bottom electrode, and the bottom electrode being used for receiving a logic input current in a direction pointing to the second terminal along the first terminal; and a top electrode positioned above the reference layer.

Abstract: A method and system for generating a high-order pseudo-random electromagnetic exploration signal. The method includes: constructing two or more basic unit signals according to an exploration requirement, where the basic unit signals are stairstep signals obtained by superposing a plurality of in-phase periodic square wave signals, and a frequency ratio between adjacent ones of the plurality of periodic square wave signals is 2; and superposing the two or more basic unit signals to obtain superposed stairstep signals, and correcting amplitudes to be consistent with amplitudes of the periodic square wave signals, to obtain high-order 2n sequence pseudo-random signals. The 2n sequence stairstep signals of different orders can be constructed within a limited frequency interval, improving the resolution during electromagnetic exploration.

Abstract: A method and system for generating a logarithmic non-uniform pseudo-random electromagnetic exploration signal including: constructing two or more basic unit signals, according to an exploration requirement, that are stairstep signals obtained by superposing in-phase periodic square wave signals, a frequency ratio between adjacent periodic square wave signals is 2, and the two or more basic unit signals meet the following requirement: if a lowest dominant frequency in a first basic unit signal is a fundamental frequency, lowest frequencies of the remaining basic unit signal are l×2m times the fundamental frequency, where l is an odd number except 1, and m is a natural number; and superposing the two or more basic unit signals to obtain a logarithmic non-uniform 2n sequence pseudo-random signal. A logarithmic non-uniform 2n sequence stairstep signal is constructed within a limited frequency interval, and requirements of prospectors for a higher frequency density within a specific frequency interval are met.

Abstract: An optical phased array lidar includes: a laser, for emitting a laser signal; an optical beam splitter, for splitting a laser signal into multiple sub-signals, and distributing them to corresponding optical paths; a phase controller connected to the optical beam splitter, for regulating phases of the multiple sub-signals; an optical antenna array based on a one-dimensional grating structure, connected to the phase controller and for uniformly scattering the phase-regulated sub-signals into free space; and a silicon nitride waveguide array, for transmitting the sub-signals and phase-regulated sub-signals to realize the transmission of near-infrared light and visible light. The optical phased array lidar uses a silicon nitride waveguide array for transmission, thereby realizing the transmission of near-infrared light and visible light. In this way, the lidar can work in the visible light band, thereby broadening the working ranging thereof.