用于模拟基坑监测的实训设备

Flexible puncture-proof and bulletproof textile fabric and manufacturing method thereof

The invention discloses a flexible stab-resistant and bulletproof textile fabric and a manufacturing method thereof. The method comprises the following steps: step 1, weaving polyimide fibers into a fabric substrate; step 2, adding 3-3.5 parts by weight of a nano additive into 18 parts by weight of an amino compound, fully stirring to obtain a mixed solution, putting a fabric substrate into the mixed solution, fully soaking at 20-50 DEG C, taking out, and drying at 30-60 DEG C to obtain a fabric substrate subjected to surface modification treatment; and step 3, uniformly spraying a polyurea elastomer on the surface of the fabric substrate subjected to surface modification treatment, and naturally airing to obtain the flexible stab-resistant and bulletproof fabric which not only has excellent stab-resistant and bulletproof performance, but also is soft and breathable.

Preparation method of liquid crystal material for liquid crystal phased array radar

The invention discloses a preparation method of a liquid crystal material for a liquid crystal phased array radar, which comprises the following steps: 1, adding a nano additive into amino compound liquid, soaking at the temperature of 20-50 DEG C, and then filtering and drying to obtain an amination modified nano additive; 2, mixing 30-60 parts by weight of an ultraviolet polymerizable monomer, 15-35 parts by weight of a chiral compound, 50-90 parts by weight of nematic liquid crystal, 1-10 parts by weight of a radar wave absorbent, 0.1-1 part by weight of a photoinitiator and 0-5 parts by weight of an amination modified nano additive, heating, and carrying out ultrasonic dispersion to uniformly mix, so as to obtain a mixture A; 3, the mixture A is poured into a liquid crystal box with the gap thickness being 5-35 microns, and air in the box is exhausted; 4, the liquid crystal box filled with the mixture A is irradiated under ultraviolet light with the illumination intensity being 1-1000 ...

ANALOG BEAMFORMING ANTENNA ARRAY HAVING LOW COMPLEXITY

Disclosed in the present invention is an analog beamforming antenna array having low complexity, relating to the technical field of communications. Said array comprises one or more sub-arrays having an independent analog beamforming function, each sub-array comprising a metal reflector plate, an antenna radiation unit array and a digital phase shifter; the digital phase shifter is directly connected to a radiation unit or a unit group, at least one digital phase shifter has different numbers of bits or has different total delay measuring ranges, and by reducing the amounts of phase shifts of some of the phase shifters, the complexity thereof can be reduced. By means of the combined use of the digital phase shifters having different numbers of bits or having different total delay measuring ranges, the analog beamforming scheme according to the embodiments of the present invention reduces the complexity of a Massive MIMO antenna array, reducing the power consumption and the cost, providing ...

Inorganic hydrated salt/graphene aerogel foam composite phase change energy storage material and preparation method thereof

The invention discloses an inorganic hydrated salt/graphene aerogel foam composite phase change energy storage material and a preparation method thereof, and the preparation method comprises the following steps: 1, mixing sodium sulfate decahydrate/lithium nitrate trihydrate composite salt, lithium iron manganese hexahydrate/calcium sulfate octahydrate composite salt, manganese cadmium titanate octadecahydrate/sodium borate hexahydrate and a binary isosorbide alpha nucleating agent to obtain a mixture A; 2, modifying the graphene nanoparticles with high thermal conductivity by using polyethylene glycol; 3, preparing asphalt-based carbon fiber reinforced graphene aerogel foam; step 4, mixing the mixture A, polyethylene glycol modified graphene nanoparticles and asphalt-based carbon fiber reinforced graphene foam, and adding a mixture of a polyethylene glycol diacrylate monomer, dipentaerythritol hexaacrylate and a photoinitiator to obtain a mixture C; 4, the mixture C is irradiated with ...

RADIAL LINE FEED DIELECTRIC RESONANT ANTENNA ARRAY

Disclosed is a radial line feed dielectric resonant antenna array, comprising a surface-slotted radial line waveguide (1), a feed probe (2) and a dielectric resonant antenna array (3). The surface-slotted radial line waveguide (1) comprises an upper-layer slotted metal plate (1a) and a lower-layer metal bottom plate (1b). The feed probe (2) comprises a metal bar (2a) and a radio antenna terminal (2b) connected to the metal bar (2a). The feed probe (2) is located at the axial centre position of the surface-slotted radial line waveguide (1). One end of the radio antenna terminal (2b) extends out of the surface-slotted radial line waveguide (1). The dielectric resonant antenna array (3) is located right above the upper-layer slotted metal plate (1a). The dielectric resonant antenna array (3) comprises multiple unit dielectric resonators. The radial line feed dielectric resonant antenna array provided in the present invention achieves linearly polarized or circularly polarized electromagnetic ...

MULTIBAND DIELECTRIC RESONANCE MOBILE PHONE TERMINAL ANTENNA

Disclosed is a multiband dielectric resonance mobile phone terminal antenna. The multiband dielectric resonance mobile phone terminal antenna is provided with a high dielectric constant rectangular ceramic dielectric (3) having a groove, a multi-branch monopole (4), a dielectric plate (1), a feeding microstrip line (2), a printing ground (5), and a via hole (6). The antenna structure has the innovations: the high dielectric constant rectangular dielectric is excited by using a multi-branch monopole, the electric field distribution in the dielectric is changed to make the dielectric generate multiple-mode resonance, which allows the terminal antenna to satisfy multimode multiband requirements; in addition, the groove is added to the dielectric of the present invention, the radiation area of the dielectric can be increased while the antenna weight is effectively reduced, and the radiation efficiency of the antenna is improved. The multiband dielectric resonance mobile phone terminal antenna ...

High-strength and cold-resistant textile fabric for space suit and manufacturing method of high-strength and cold-resistant textile fabric

The invention discloses a high-strength and cold-resistant textile fabric for space suits and a manufacturing method thereof. The method comprises the following steps: step 1, blending polyimide fibers and heat-conducting carbon fibers, and weaving into a fabric substrate; step 2, placing the fabric substrate in an amino compound liquid, fully soaking at 20-50 DEG C, taking out, and drying at 30-50 DEG C to obtain a surface-modified fabric substrate; and step 3, uniformly spraying a polyurea elastomer on the surface of the fabric substrate subjected to surface modification treatment, and naturally airing to obtain the high-strength and cold-resistant fabric. A compact polyurea film is arranged on the surface of the manufactured fabric, and the fabric not only has good cold resistance, but also is high in mechanical strength.

Preparation method of bulletproof polyurea elastomer coating

The invention discloses a bulletproof polyurea elastomer coating preparation method, which comprises: 1, mixing 6-10 parts by weight of an amino compound, 0.5 part by weight of a nanometer bulletproof enhancer and 0.5 part by weight of a nanometer bulletproof modifier, uniformly stirring at a temperature of 30-60 DEG C, and drying to obtain a mixture C of the nanometer bulletproof enhancer modified by the amino compound and the nanometer bulletproof modifier; 2, uniformly mixing 1-50 parts by weight of diisocyanate, 0.01-1 part by weight of a catalyst and 1-50 parts by weight of a plasticizer, putting the mixture into a tubular furnace, heating to 90-100 DEG C from room temperature at a heating rate of 1-3 DEG C, and preserving heat for 2-2.5 hours to obtain a component A; 3, uniformly stirring 1-50 parts by weight of amino-terminated polyether, 0.1-30 parts by weight of a liquid amine chain extender, 0-50 parts by weight of a plasticizer, 0.01-1 part by weight of a catalyst, 0.01-1 part ...

Wireless channel measurement method and system based on universal software radio peripheral

The invention provides a wireless channel measurement method and system based on a universal software radio peripheral. The method comprises the following steps: acquiring a pseudo-random FZC sequence; performing data preprocessing on the pseudo-random FZC sequence; inputting the pseudo-random FZC sequence into a universal software radio peripheral; configuring a transmitting end and a receiving end of the universal software radio peripheral; a transmitting end transmits a pseudo-random FZC sequence, and convolution processing is carried out on the pseudo-random FZC sequence and a wireless channel containing Gaussian white noise; the receiving end receives and demodulates the corresponding sequence signal; sliding correlation operation is carried out on the pseudo-random FZC sequence and the sequence signal, and the amplitude and the time delay of the multipath sequence signal are distinguished; and performing convolution processing on the conjugate of the sequence signal and the pseudo-random ...

Antenna near-field data correction method, electronic equipment and storage medium

According to the antenna near-field data correction method, the electronic equipment and the storage medium, cubic spline interpolation processing is performed on a plurality of original near-field data exported by a non-fault probe adjacent to a fault probe in a multi-probe measurement system; constructing a cubic spline interpolation function in a target interval formed by the fault probe and the adjacent non-fault probe, and determining corrected near-field data corresponding to the fault probe according to an interpolation point of the fault probe included in the cubic spline interpolation function; and replacing abnormal data exported by a corresponding fault probe in the multi-probe measurement system with the corrected near-field data. According to the invention, the accuracy and integrity of the actual near-field data acquired by the multi-probe measurement system can be improved, the error problem caused by abnormal data measured by individual fault probes in the near-field measurement ...

Method, system and equipment for identifying railway tree invasion limit

The invention belongs to the field of image recognition, particularly relates to a method, a system and equipment for recognizing railway tree invasion, and aims to solve the problem that a method capable of automatically judging whether trees along a railway influence a running train or not does not exist. The method comprises the following steps: collecting a scene image containing a target railway; obtaining a treetop image, a column image and a near-end track image through a target detection algorithm; obtaining a rail image vanishing point based on the near-end rail image; setting a height limiting point based on the column image; dividing the scene image containing the target railway into a limit invasion judgment area and a reserved operation area based on connection of a high limit point and a vanishing point; and judging whether the treetop enters the intrusion limit judgment area. By utilizing the linear perspective principle, the scene image of the target railway is automatically ...

Denoising method and system for multi-energy-level CT sparse view and storage medium

The invention provides a de-noising method and system for a multi-energy-level CT sparse view and a storage medium, a generator and a discriminator with multiple channels are arranged in a neural network model for de-noising the multi-energy-level CT sparse view, and the input and output of the generator and the discriminator in the neural network model are set as multi-dimensional matrixes. The neural network model can be applied to denoising of the multi-energy-level CT sparse view, the training time is saved, the correlation between different energy levels in the multi-energy-level reconstructed image of the same scanning section is considered, and therefore the definition of the output image is improved at a time with a good effect.

Paraffin/graphene composite phase change energy storage material and preparation method thereof

The invention discloses a paraffin/graphene composite phase change energy storage material and a preparation method thereof.The method comprises the steps that 1, even-carbon n-alkanes and substituted aryl amide type beta nucleating agents are taken by weight to be mixed, stirred and subjected to ultrasonic dispersion, and the paraffin phase change energy storage material is obtained; 2, mixing the graphene nanoparticles with a paraffin modifier according to a mass ratio, and sequentially stirring, centrifuging and drying to obtain high-thermal-conductivity graphene nanoparticles modified by the paraffin modifier; 3, mixing a paraffin phase-change energy storage material, a mixture of a phase-change energy storage polyethylene glycol diacrylate monomer and dipentaerythritol hexaacrylate, the paraffin modifier modified high-thermal-conductivity graphene nanoparticles and the multilayer assembled graphene foam in parts by weight, and uniformly stirring to obtain a precursor; and 4, irradiating ...

Space-time modulation type frequency-adjustable non-magnetic non-reciprocal band-pass filter

The invention provides a space-time modulation type frequency-adjustable non-magnetic nonreciprocal band-pass filter, which is characterized in that a radio frequency input port is connected with one end of one transmission line in a first coupling line, and the other end of the transmission line is connected with a first short-circuit branch; one end of the other transmission line of the first coupling line is connected with the anode of the first variable capacitor, and the other end is connected with the first short-circuit branch; one end of one transmission line in the open-circuit coupling line is simultaneously connected with the cathode of the first variable capacitor and the first modulation port, and the other end of the transmission line is open-circuited; one end of the other transmission line is simultaneously connected with the cathode of the second variable capacitor and the second modulation port, and the other end is open-circuited; the radio frequency output port is connected ...

High-selection filtering single-ended to differential power divider with ultra wide band difference and common mode isolation

The invention provides a high-selection filtering single-end-to-differential power divider with ultra wide band difference and common mode isolation. The high-selection filtering single-end-to-differential power divider comprises a metal grounding layer, a dielectric plate layer and a metal circuit layer which are sequentially arranged from bottom to top. The metal circuit layer is composed of a four-wire coupling line, two isolation resistors, a short-circuit branch knot, two open-circuit branch knots, two filter coupling lines and a balance transmission line between two differential output ports, and the whole metal circuit layer is longitudinally symmetrical with the single-end input port as a symmetry point. According to the five-port power divider provided by the invention, equal power distribution from a single end to two differential output ports is realized, and meanwhile, the power divider is simple in circuit structure; the filter has a high-selectivity filtering function, a flexible ...

Terahertz MIMO wireless communication channel modeling method and device based on IRS assistance

The invention provides a terahertz MIMO wireless communication channel modeling method and device based on IRS assistance, and the method comprises the steps: obtaining the transmitting power, the first position information of each antenna unit of a transmitting end, the second position information of each antenna unit of a receiving end, and the third position information of each reflection unit of an IRS reflection surface, calculating a first distance between each antenna unit of the transmitting end and each antenna unit of the receiving end, a second distance between each antenna unit of the transmitting end and each reflection unit of the IRS reflection surface, and a third distance between each antenna unit of the receiving end and each reflection unit of the IRS reflection surface; determining a first channel gain based on each first distance, determining a second channel gain based on each second distance, and determining a third channel gain based on each third distance; determining ...

High-frequency-ratio microwave and millimeter wave cross-band filter circuit and chip

The invention provides a high-frequency-ratio microwave and millimeter wave cross-band filter circuit and a chip, the circuit comprises a high-frequency band-pass circuit and a low-frequency band-pass circuit, the high-frequency band-pass circuit comprises a first coupling line and a second coupling line, a dual-frequency signal is input into the first coupling line through an input port, and a dual-frequency signal is input into the second coupling line through an output port; high-frequency signals in the dual-frequency signals are coupled to the high-frequency band-pass circuit through the first coupling line and then input to the second coupling line, and the high-frequency signals are coupled through the second coupling line and output to the output port; the low-frequency band-pass circuit comprises a first series resonator and a second series resonator which are connected with each other, the first series resonator is connected with the first coupling line, and the second series ...

Polyurea elastomer composite fabric and manufacturing method thereof

The invention discloses a polyurea elastomer composite fabric and a manufacturing method thereof. The method comprises the following steps: 1, mixing 47-100 parts by weight of carbon fiber, 47-100 parts by weight of aluminum silicate ceramic fiber, 5-50 parts by weight of polyimide fiber and 1-20 parts by weight of glass fiber, and weaving into cloth; 2, 25-100 parts by weight of an amino compound is dissolved in absolute ethyl alcohol with the same weight part as the amino compound, and after uniform mixing, amino modification liquid is obtained; 3, under the conditions that the temperature is 20-35 DEG C and the humidity is 20-50%, soaking the cloth in the amino modification liquid, taking out the cloth, and drying the cloth at 60-80 DEG C to obtain a modified cloth substrate; and 4, at 15-40 DEG C, uniformly spraying a polyurea elastomer on the surface of the modified cloth substrate by using spraying equipment to obtain the polyurea elastomer composite fabric which has excellent bulletproof ...