Abstract: The present invention discloses a preparation method of highly alkali-stable cationic polymers, including the following steps: placing a polymerization mixture comprising 1-R1-3-piperidinone or its salts or hydrate thereof and arene monomers in a first organic solvent, performing catalytic polycondensation by adding organic strong acids, and obtaining a polymer dispersion with piperidine moieties; slowly dropping the dispersion of the polymer with piperidine moieties into a first precipitant, and obtaining a polymer powder with piperidine moieties after drying; dissolving the polymer powder with piperidine moieties of in a second organic solvent, after adding the quaternization reagent, obtaining a cationic polymer solution.

Abstract: A peony stamen-dodder composite, which is prepared from 10-18 parts by weight of peony stamen and 5-12 parts by weight of dodder. In the preparation process, the peony stamen is sequentially subjected to desensitization, impregnation with a saline and drying, and the dodder is impregnated with a saline and baked. The pre-treated peony stamen and dodder are crushed, impregnated in warm water, ultrasonicated and filtered, and the filter residue is added with water, ultrasonicated and filtered. The filtrates are combined and concentrated under vacuum to obtain the desired composite. This application further provides an application of the composite in the treatment of nephritis.

Abstract: A preparation method for a W—Cu composite plate with a Cu phase in finger-shaped gradient distribution is provided. The method includes adding WOX powder obtained with ammonium metatungstate as a raw material into W powder through a combustion synthesis method, adding a binder and a pore-forming agent to prepare a slurry, then performing tape casting, soaking in water and sintering to obtain a W framework with pores in finger-shaped distribution, and then infiltrating Cu to obtain a target product. The Cu phase in the W—Cu composite material prepared by the present method is distributed in a finger-shaped gradient manner from an infiltration surface to the interior of a specimen, the Cu phase and the W phase are mutually pinned, and the W—Cu interface has good bonding strength. The present method has the characteristics of adjustable material component performance, simple process, low cost, suitability for large-scale production and the like.

Abstract: The present disclosure relates to an asymmetric compensation method and apparatus for a two-port near field probe, a device, and a storage medium. The method includes: obtaining a first scattering parameter collected by a symmetric two-port network established based on a symmetric two-port near field probe; obtaining a second scattering parameter collected by an asymmetric two-port network established based on an asymmetric element; obtaining an overall response of a calibration network in a magnetic field environment, the calibration network being established based on the symmetric two-port near field probe and the asymmetric element; calculating a calibration factor based on the scattering parameter of the symmetric two-port near field probe, the scattering parameter of the asymmetric element, and the overall response of the calibration network in the magnetic field environment; and compensating the symmetric two-port near field probe according to a calibration factor.

Abstract: Disclosed are a method and device for realizing advanced nitrogen removal of mature landfill leachate and sludge reduction by using sludge fermentation products as carbon source, belonging to the field of biological treatment of sludge of high ammonia nitrogen wastewater.

Abstract: A material with pine-branch like samarium oxide/graphene/sulfur gel structure, and a preparation method and use thereof. The material is reduced graphene oxide carrying pine-branch like samarium oxide on the surface to form a cross-linked gel structure, and sulfur is loaded on the gel structure. The preparation method includes: subjecting graphene oxide and a samarium salt to hydrothermal reduction to prepare a reduced graphene oxide/samarium precursor; under an inert atmosphere, thermolysing the reduced graphene oxide/samarium precursor to obtain a reduced graphene oxide/pine-branch like samarium oxide gel; and melting and diffusing the sulfur onto the reduced graphene oxide/pine-branch like samarium oxide gel. The material with pine-branch like samarium oxide/graphene/sulfur gel structure greatly improves the electrochemical performance of lithium-sulfur batteries.

Abstract: An aluminum alloy pre-strengthening and hot forming production line is provided, including a pre-strengthening heat treatment mechanism, a forging mechanism, and a trim press. The pre-strengthening heat treatment mechanism includes a roll forging machine, a solid solution furnace, a quenching water tank, an aging furnace, and a heat preservation furnace. The forging mechanism includes an upsetting press machine, and a forging press machine. The upsetting press machine is configured for blanking an heat preserved aluminum alloy bar-shaped blank, and the forging press machine is configured for forging and forming the blanked aluminum alloy bar-shaped blank. The trim press is configured for trimming the forged and formed aluminum alloy rod-shaped blank, so as to obtain an aluminum alloy member meeting a requirement.

Abstract: The present disclosure belongs to the technical field of heat exchangers, and provides a heat exchanger based on a Gyroid/Diamond (GD-type) hybrid minimal surface-based disturbance structure. The heat exchanger includes a core, headers, and flanges. The core includes a cold fluid channel and a hot fluid channel, the cold fluid channel and the hot fluid channel are separated by a parting sheet. An inlet and an outlet of the cold fluid channel are separated from an inlet and an outlet of the hot fluid channel by sealing bars. A GD-type hybrid minimal surface-based disturbance structure is inserted into the hot fluid channel. A cold fluid and a hot fluid are distributed in a cross-flow manner.

Abstract: The present invention relates to a bismuth tungstate/bismuth sulfide/molybdenum disulfide heterojunction ternary composite material and a preparation method and application thereof. The composite material is composed of bismuth tungstate, bismuth sulfide and molybdenum disulfide in an ordered layered way, Bi2WO6 is an orthorhombic system, Bi2S3 is a p-type semiconductor located on a (130) crystal face, MoS2 is a layered transition metal sulfide located on a (002) crystal face, the whole composite material is of a spherical structure with an unsmooth surface, and a layer of nanosheets uniformly grow on an outer layer. The average particle size of composite materials is in the range of 2.4-2.6 ?m. The spherical Bi2WO6/Bi2S3/MoS2 heterojunction ternary composite material prepared in the present invention has good adsorption of Cr(VI) and high catalytic reduction ability under visible light.

Abstract: A cooperative bonding method for a bonding head of a wire bonding machine, including setting an initial height value of the vertical lifting mechanism to be a difference value; upon receiving a bonding instruction, controlling the bonding head to perform an positioning operation on the target processing chip, controlling the vertical lifting mechanism to descend a preset distance; during the positioning operation of the bonding head on the target processing chip, when the acceleration motion and the overshoot is completed, controlling the vertical lifting mechanism to rise back; and during the rise back process, the pad of the chip does not exceed a residual vibration curve of the bonding head. This achieves the technical effect of improving the bonding efficiency of the bonding head within a small searching area while avoiding impacts on the chip caused by the overshoot during high acceleration positioning of the bonding head.

Abstract: Disclosed in the present disclosure are a dual-polarized broadband millimeter-wave filtering antenna based on a meta-surface, and a communication device. The dual-polarized broadband millimeter-wave filtering antenna based on a meta-surface comprises two layers of dielectric substrates, which are arranged in a stacked manner, wherein an upper surface and a lower surface of a lower-layer dielectric substrate are respectively provided with an upper-layer metal ground and a lower-layer metal ground, an upper surface of an upper-layer dielectric substrate is provided with a meta-surface structure, the meta-surface structure comprises N metal patches, which are arranged in an array, a slot is etched on each metal patch, the upper-layer dielectric substrate is connected to the upper-layer metal ground, and a Jerusalem cross slot is etched on the upper-layer metal ground.

Abstract: The present invention relates to a method for manufacturing a stretchable electrochromic device and a stretchable electrochromic device manufactured thereby, and more specifically, the present invention is characterized in that a stretchable electrochromic device, which is manufactured by stretching color changeable polymer gel, and then coating one surface and/or the other surface thereof with a metal solution, has excellent water resistance and initial transmittance.

Abstract: An intelligent seed production apparatus and method based on multistage screening and bud eye identification includes a feeding module, a pre-cutting module, a bud eye identifying and cutting module, and a material mixing module. The feeding module can screen out seed potatoes with the mass and shapes meeting the requirements through a multistage screening mechanism. The pre-cutting module can receive the seed potatoes discharged from the feeding module, and cut each seed potato in half; the bud eye identifying and cutting module can receive the seed potato pieces discharged from the pre-cutting module and determine the weight of the seed potatoes and identify the bud eye distribution on the surfaces of the seed potatoes, and cut the seed potato into multiple required tubers, so that bud eyes are distributed on different tubers uniformly. The material mixing module can receive the cut tubers, and complete the material mixing of the tubers.

Abstract: An electrocardiograph (ECG) signal quality evaluation method based on a multi-scale convolutional and densely connected network is provided. Firstly, an original ECG signal is preprocessed to remove a baseline drift and power line interference. Then, based on a consistency principle of a label determining result and a principle of setting a confidence coefficient, an AlexNet model is trained to mutually correct incorrect labels in a dataset to obtain a final ECG signal fragment for quality classification. Finally, the signal fragment is input into an improved lightweight densely connected quality classification model to classify quality of the ECG signal fragment.

Abstract: Disclosed is an automatic leveling CFRP plate pre-stressing and tensioning device for a curved surface structure, including a fixed end mechanism and a tension end mechanism, one end of the CFRP plate is connected to the fixed end mechanism and the other end is connected to the tension end mechanism, and the fixed end mechanism cooperating with the tension end mechanism to reinforce a curved surface. The fixed end mechanism includes a fixed end base plate, a fixture, a fixed end CFRP plate clamping plate, and a second high-strength bolt. The fixed end base plate is provided with a slide groove, the fixture is hinged within the slide groove by the second high-strength bolt; the fixture is provided with a fixture groove, and a size of the fixture groove decreases from one end of the fixture near the tension end mechanism to the other end of the fixture.

Abstract: A robot joint device having an upper arm unit including a first rotating pulley, a second rotating pulley and a third rotating pulley sequentially arranged in one direction, a forearm unit including a fixing pulley configured to rolling-contact the third rotating pulley, a connection unit including a first pivot shaft passing through the third rotating pulley and being connected to the upper arm unit, and a second pivot shaft passing through the fixing pulley and being connected to the forearm unit, a first cable unit wound around the first rotating pulley in a first direction, bent between the second rotating pulley and the third rotating pulley, and fixed to the fixing pulley, and a second cable unit wound around the first rotating pulley in a second direction opposite to the first direction, bent between the second rotating pulley and the third rotating pulley, and fixed to the fixing pulley.

Abstract: The present invention provides a cyclic tetradentate metal platinum complex phosphorescent material based on pyridine heterocycle, benzoxazole, and carbazole derivatives. It is a novel tetradentate platinum (II) complex with a 6/6/6 metal fused ring phenoxy coordination structure. The phosphorescent material of the N—C—N—N tetradentate fused ring structure system of the present invention have the characteristics of easy modulation of HOMO and LUMO orbital energy levels and strong luminescence. It has good chemical stability and thermal stability, and is easy to fabricate evaporation-type OLED devices.

Abstract: A robot joint device may include a first frame unit having a first hollow portion, a second frame unit having a second hollow portion, the second frame unit spaced apart from the first frame unit, a rotational axis unit on and between the first and second hollow portions and configured to rotate around first, second and third axes which are perpendicular to one another, a first link unit extending to bypass the rotational axis unit, connected to each of the first and second frame units with the rotational axis unit interposed therebetween, and configured to rotate around the first and second axes, and a second link unit extending to bypass the rotational axis unit while intersecting with the first link unit, connected to each of the first and second frame units with the rotational axis unit interposed therebetween, and configured to rotate around the first and second axes.

Abstract: The present invention is in the field of organic electroluminescence, and specifically relates to a fused ring carbazole tetradentate metal platinum (II) complex and use thereof. In the present invention, a tetradentate metal platinum (II) complex phosphorescent material is obtained by introducing a five-membered heterocyclic system such as benzofuran or benzothiophene at the 5, 6-positions of carbazole. Increasing the ratio of the local state (LE) in the excited triplet state of the cyclic tetradentate platinum (II) complex leads to a lower shoulder peak, which improves the luminescence color purity of the materials, which in turn increases device lifetime. The materials provided by the present invention all have good chemical stability and thermal stability and are easy to fabricate an evaporation-type OLED device.

Abstract: The present invention introduces a capillary distillation method comprising the following steps: heating wastewater, subsequently directing the heated wastewater to one end of a water-diversion fiber material. Through capillary action, the heated wastewater permeates the water-diversion fiber material, diffusing downward along microchannel pathways within the material. Upon reaching the surface of the water-diversion fiber material, the wastewater evaporates. Water vapor is then directed to a condensation module, where it undergoes condensation and collection, resulting in the production of fresh water.