84results about How to "Good process repeatability" patented technology

The invention discloses a chiral amino acid resolving agent for preparing trans chiral indene amine, and particularly provides a chiral amino acid derivative which is used as a resolving agent for resolving trans-2, 6-dimethyl-1-indene amine and preparing (1R, 2S)-2, 6-dimethyl-1-indene amine. According to the method, the conditions of the resolution process are mild, the used solvent is a general solvent which is widely applied in the market, low in price and easy to obtain, and the (1R, 2S)-2, 6-dimethyl-1-indene amine is obtained with high yield and high optical purity. The method has the beneficial effects that (1R, 2S)-2, 6-dimethyl-1-indene amine is obtained, the ee value of the (1R, 2S)-2, 6-dimethyl-1-indene amine is greater than 97%, and the resolution yield is greater than 95%. As the resolving agent is poor in hydrophilicity, the resolving agent can be recycled at a high recovery rate, the process repeatability is high, and industrial production is easy to realize.

The invention discloses a modification method for improving corrosion resistance of a chromium-nickel cladding coating, which comprises the following steps: preparing cladding powder according to a mass ratio, cleaning the surface of a workpiece to be plated, and preparing the chromium-nickel corrosion-resistant coating through plasma cladding, wherein the solid-phase cladding powder comprises the following components in percentage by mass: 50 to 80 percent of Cr, 15 to 45 percent of Ni, 0 to 5 percent of Hf, 0 to 5 percent of NH4Cl and 2 to 5 percent of La2O3. According to the modification method for improving the corrosion resistance of the chromium-nickel cladding coating, a prepared infiltrated layer is uniform in organization structure, moderate in thickness, sufficient in Cr atom diffusion, good in metallurgical bonding with a base body, not prone to falling off and suitable for austenitic steel and high-temperature alloy parts used for workpieces with the large length-diameter ratio and various complex shapes such as large boilers and oil and gas field conveying pipelines; and the method has excellent industrial batch production benefits.

The invention discloses an estradiol valerate sugar-coated tablet and a preparation method thereof. The estradiol valerate sugar-coated tablet sequentially comprises a tablet core, a powder coating layer, a first sugar coating layer, a coloring layer and a second sugar coating layer from inside to outside, the tablet core contains estradiol valerate; the powder coating layer is prepared from the following components in parts by weight: 1.7 to 3.7 parts of polyethylene glycol 6000, 25 to 35 parts of cane sugar, 0.1 to 0.4 part of povidone K90, 10 to 18 parts of calcium carbonate and 4 to 10 parts of talcum powder. According to the invention, crystallization of cane sugar is effectively inhibited, the surface of a powder coating layer is finer and smoother, the undesirable phenomenon of tablet edge cracking is avoided, and the quality defects of uneven color, color fading and the like caused by moisture absorption are also avoided.

This invention belongs to the field of core-shell material technology and discloses a core-shell material based on nickel-manganese oxide / nickel-manganese organic framework and its preparation method, including the following steps: mixing nickel salt, manganese salt and organic ligand solution, and carrying out a hydrothermal reaction under alkaline conditions to synthesize a nickel-manganese organic framework precursor; subjecting the nickel-manganese organic framework precursor to programmed temperature heat treatment in a mixture of inert gas and oxygen to obtain a heterogeneous nanostructured nickel-manganese oxide / nickel-manganese organic framework core-shell material. By precisely controlling the concentration of the organic ligand solution and the pH value of the reaction system, and by optimizing the synthesis conditions, uniform and controllable growth of the nickel-manganese organic framework core is achieved.

The application discloses a reflection type volume grating uniformity improving device and method, which adopts a double-system cooperative structure of axial exposure dose compensation and double-beam interference exposure. The axial exposure dose compensation system compensates the non-uniform axial exposure dose distribution caused by energy attenuation through laser irradiation of a photosensitive wave band of a recording medium and multi-axis rotation of the recording medium. The double-beam interference exposure system generates two collimated coherent lights with adjustable polarization states and powers by using laser of a high-transmittance wave band of the recording medium and a polarized beam splitter, and accurately controls the interference angle by adjusting the mirror posture, so that the high-contrast grating structure is written in the recording medium subjected to the axial exposure dose compensation. The application can effectively solve the non-uniform exposure dose distribution problem caused by laser energy attenuation in the traditional preparation process, thereby guaranteeing the consistency of the axial performance of the volume grating, and effectively promoting the development of the fields of high-performance laser beam combination, pulse compression and optical communication filter which need high-uniformity volume grating.

The invention relates to a high-sensitivity MEMS flow sensor and a manufacturing method thereof.The high-sensitivity MEMS flow sensor comprises a sensor chip, a metal base and a measuring runner, the sensor chip comprises a substrate, and a porous silicon area is formed in the substrate; the first dielectric layer is formed on the substrate and the upper surface of the porous silicon region; the heating resistor array is formed on the upper surface of the first dielectric layer and is positioned right above the porous silicon region; the thermopile array is formed on the upper surface of the first dielectric layer and located over the porous silicon area, and the thermopile array and the heating resistor array are alternately arranged in the direction of the gas flow channel; the electric isolation layer covers the heating resistor array and the thermopile array; the metal interconnection structure is formed on the upper surface of the electric isolation layer and is connected with the thermopile array; the electrode is connected with the metal interconnection structure; and the second dielectric layer covers the electrical isolation layer and the metal interconnection structure. A multi-pair symmetrical distribution structure in which the thermopiles and the heaters are alternately arranged is adopted, so that the measurement sensitivity of the flowmeter is remarkably improved.

The invention discloses a temperature control method for processing graphite by using double plasma sources, and relates to the technical field of plasma material processing, in particular to a temperature control method for processing graphite by using double plasma sources, which comprises the following steps: adopting a cylindrical reactor, and arranging a plasma source I and a plasma source II up and down along the axial direction on two sides of the cylindrical reactor, and an outlet of the powder feeding mechanism directly faces a core high-temperature area of the plasma source I, so that graphite powder directly enters a heating area. The two sources are connected in series up and down to construct a continuous relay type high-temperature path. The center distance between the powder feeding port and the source I is limited not to exceed half of the outlet diameter of the reactor, the center distance between the two sources is 1-2.5 times of the outlet diameter, and the center distance between the source II and the outlet is larger than 5 times of the diameter; the flow of the second source is 1.2-1.8 times that of the first source, the temperature of the core area is maintained to be 8000-10000 K by adjusting the flow ratio, and the total power does not exceed 100 kilowatts. The total retention time of the graphite powder in a two-source high-temperature area is longer than 0.2 second, the diameter of an outlet of the reactor is 100-400 mm, the reactor is made of high-temperature-resistant stainless steel or graphite, and accurate control over the graphite treatment temperature is achieved.

This invention discloses an acetone sensor based on MOF-derived oxygen-vacancy-rich α-Fe₂O₃ and its fabrication method. The aforementioned acetone gas sensor has a planar structure, including an Al₂O₃ ceramic sheet, a pair of interdigitated gold electrodes printed on the upper surface of the Al₂O₃ ceramic sheet, a RuO₂ heating film printed on the lower surface of the Al₂O₃ ceramic sheet, a pair of strip-shaped gold electrodes printed on the surface of the RuO₂ heating film, a gas-sensitive film coated and fixed to the surface of the interdigitated gold electrodes, platinum wire leads I, II, III, and IV. The gas-sensitive film uses an oxygen-vacancy-rich α-Fe₂O₃ sensitive material. This invention can produce an acetone sensor with excellent acetone sensitivity characteristics, enabling efficient detection of low concentrations of acetone. It overcomes the problems of insufficient sensitivity and slow response speed of traditional gas sensors in acetone detection. Furthermore, the acetone sensor fabrication process is highly compatible with existing microfabrication technologies, meeting the needs of industrial production.

A laser-plasma synergistic surface treatment method for CFRP / titanium alloy heterojunctions belongs to the field of heteromaterial bonding technology. First, nanosecond pulsed lasers are used to etch the surfaces of CFRP and titanium alloy to be bonded, constructing a micro-nano composite structure. Then, atmospheric pressure cold plasma is used to activate the etched surfaces, grafting polar functional groups. Finally, the two are bonded and cured using an adhesive. This invention achieves a dual enhancement effect of "mechanical interlocking" and "chemical bonding" by organically combining "laser etching to construct micro-nano physical structures" and "plasma activation to introduce chemical functional groups," significantly improving the interfacial bonding strength of CFRP / titanium alloy heterojunctions. Compared with single treatment methods, this invention can increase the joint shear strength by more than 38%, and the failure mode changes from interfacial failure to cohesive failure. It has advantages such as environmentally friendly process, good controllability, and significant effects, and has broad application prospects in aerospace, high-end equipment manufacturing, and other fields.

The invention discloses a passivation material, the structural formula of the passivation material is shown in the specification, X is independently selected from F, Cl, Br or I, and Y is independently selected from-PO3H2,-SO4H,-COOH,-OH or-SH. The passivation material and uncoordinated Pb < + > on the surface of the perovskite can form a powerful double-site coordination effect, the interface defect state density is remarkably reduced, and non-radiative recombination is inhibited. Meanwhile, the interface energy band structure is effectively regulated and controlled, the Fermi level is moved upwards, the surface n-type characteristic is enhanced, and therefore energy level alignment is optimized, the electron extraction potential barrier is reduced, and the charge transmission efficiency is improved.

This invention belongs to the field of engineered wood products manufacturing, specifically a method for preparing low-formaldehyde finger-jointed boards based on bio-based modified adhesives. The method includes preparing an adhesive composed of modified soybean protein, non-formaldehyde crosslinking agents, micro / nano cellulose, nano-silica, and epoxidized vegetable oil elastomers; pre-treating the wood and cutting the finger joints; applying a sealing liquid via atomization for end-face damping treatment; performing quantitative adhesive application and stepped butt joint molding; and employing a multi-stage hot-pressing process involving preheating penetration, high-temperature curing, and cooling and pressure holding. Through the above technical solution, this application can achieve the formation of a dense adhesive film at the finger joint interface, significantly improving bonding strength and stability while reducing formaldehyde release.

The invention belongs to the field of memristors, and discloses a memristor with a high on-off ratio and low off-state current density and a preparation method thereof.The preparation method comprises the following steps that an ITO substrate with the hydroxylated surface is soaked in an ethanol solution of 3-aminopropyltriethoxysilane; 3-aminopropyltriethoxysilane molecules are modified on the surface of the ITO substrate, and the ITO substrate with positive electricity on the surface is obtained; the method comprises the following steps: soaking an ITO substrate with a positively charged surface in a gold nanoparticle colloidal solution to obtain a substrate assembled with gold nanoparticles, spin-coating polymethyl methacrylate on the surface of the substrate assembled with the gold nanoparticles, baking until the substrate is dry, and then plating an aluminum film to obtain the memristor with high on-off ratio and low off-state current density. The memristor disclosed by the invention has an ultrahigh switch ratio and ultralow off-state current density at the same time, can be stably converted between a high-resistance state and a low-resistance state, and has a long-time retention characteristic and good process repeatability.

This invention relates to the field of organic compound preparation technology, specifically a method for preparing 11-triglycerides of carbonate via low-temperature acylation. This method uses glycerol and undecanoyl chloride as raw materials, employing a synergistic system of a "composite acid-binding agent + Lewis acid catalyst," and combines in-situ dehydration technology and a stepwise heating strategy in a dual-solvent environment to achieve efficient synthesis. The specific steps include: under nitrogen protection, dissolving glycerol in a dichloromethane-toluene dual solvent, adding a composite acid-binding agent of pyridine and N,N-diisopropylethylamine, anhydrous zinc chloride catalyst, and 4A molecular sieve for in-situ dehydration; dropwise adding undecanoyl chloride at a low temperature of 5-10°C, followed by sequential heating to 30°C for 2-3 hours and then reacting at 50°C for 12-16 hours; and post-processing using a combined process of filtration-multi-stage extraction-membrane separation-column chromatography. This invention provides mild reaction conditions, effectively suppresses side reactions, produces high-purity products, increases molar yield, and reduces solvent toxicity and purification costs.

The invention discloses a laser cladding Al / FeCrAl gradient coating for a waste incineration working condition. The laser cladding Al / FeCrAl gradient coating comprises an aluminum alloy coating arranged on the surface of a base material and a FeCrAl alloy mixed coating arranged on the surface of the aluminum alloy coating. The invention further discloses a preparation method of the laser cladding Al / FeCrAl gradient coating. According to the method, by means of the laser cladding technology and accurately controlling the machining parameters of laser cladding, good combination of the coating and the base material is ensured, generation of defects such as cracks and gaps is reduced, the adhesive force and the bonding strength of the coating are improved, the compact Al / FeCrAl gradient coating is prepared on the surface of the base material, and the coating quality is improved. And / or formation of a compact Al2O3 protective film is promoted, so that the overall corrosion resistance of the coating is enhanced, and the high-temperature stability and durability of the coating are also improved; the permeation of a corrosive medium is effectively prevented. The superheater pipeline is particularly suitable for a waste incineration power generation environment.

The invention discloses a rigid-flex board blind scooping uncovering method and a rigid-flex board, and the method comprises the following steps: 1, providing a first PP layer, and pasting an uncovering film on one side surface of the first PP layer; step 2, performing laser treatment on the uncovering film and the first PP layer from one side with the uncovering film; step 3, providing a main board and attaching a cover film on the surface of the main board; 4, providing a second PP layer, and aligning and pressing the second PP layer, the first PP layer and the main board; 4, the tearing hand is fished through a milling cutter; step 5, using a milling cutter to control depth blind fishing; and 6, forming a hand tearing position in the uncovering area of the second PP layer, and completing uncovering. The first kerf is formed in the first PP layer, and the second kerf is formed in the second PP layer, so that the problems that the inner-layer mainboard is damaged by deep laser and glass fibers cannot be cut off due to shallow laser when the cover is opened by laser are solved.

The application discloses a kind of carbon black supported iron manganese composite oxide cluster catalyst's Joule heat preparation method and its application in electrocatalytic nitrate reduction preparation ammonia, belong to electrocatalytic ammonia preparation technical field.The catalyst Ketjenblack EC-600JD carbon black is used as carbon carrier, iron manganese composite oxide cluster is uniformly dispersed on the surface of carbon carrier, and the carbon carrier is worm-like mesoporous structure, with high specific surface area and high defect concentration.The application uses sodium citrate as complexing agent, acetylacetone iron and manganese acetate as metal precursor, after complexing, loading, gelation, freeze drying, the target catalyst is prepared by Joule heat instantaneous heat treatment under nitrogen atmosphere;The preparation process has high heat conversion efficiency, low energy consumption, can realize atomic dispersion of iron manganese composite oxide cluster, effectively improves the exposure degree of catalytic active site.The catalyst shows high catalytic activity, high selectivity and excellent stability in electrocatalytic nitrate reduction preparation ammonia reaction, and the ammonia preparation faraday efficiency can reach more than 85%, and the preparation process does not need noble metal and toxic reagent, and the process is green and efficient, easy to scale production, can efficiently convert nitrate wastewater into ammonia, with environmental governance and nitrogen resource recycling value.

This invention discloses a two-step pulse electrodeposition method for preparing a nickel-tungsten-cobalt ternary metal oxygen evolution electrode and its application. Specifically, it addresses the Ni... 2+ Co 2+ With W 6+ The large differences in reduction potential and the mismatch in reduction kinetics lead to elemental segregation in single-step deposition. This invention addresses this problem by employing a two-step pulsed electrodeposition strategy: first depositing a Ni-W metal layer, then depositing a Ni-Co metal layer. This strategy optimizes the plating bath composition and pulse parameters step-by-step to accommodate the reduction requirements of different metal ions. The method includes: pretreatment of the nickel-based substrate; performing a first-step pulsed electrodeposition in a solution containing nickel and tungsten salts; and then performing a second-step pulsed electrodeposition in a solution containing nickel and cobalt salts, followed by drying. This invention, through specific two-step deposition and the periodic regulation of the pulsed current, effectively optimizes the loading and dispersion of nickel, tungsten, and cobalt, resulting in a high-performance oxygen evolution electrode with stable and reliable performance, meeting the application requirements of large-scale industrial production.

The invention discloses Ti-based alloy powder, which is prepared from the nominal components in percentage by atom: (5 to 10) of Ti, (2 to 5) of Al, (1 to 3) of V, (0.5 to 2.0) of Y2O3 and the balance of Ti and inevitable impurities, the preparation method comprises the following steps: 1, weighing raw material powder; 2, charging and sealing; 3, ball milling; and 4, discharging to obtain Ti-based alloy powder. According to the Ti-based alloy powder disclosed by the invention, high-volume nano Y2O3 is introduced and uniformly dispersed in a Ti matrix to form a dispersion strengthening phase, so that the room-temperature and high-temperature strength, creep resistance and thermal stability of the alloy are improved; according to the mechanical alloying process, the ball-to-material ratio, the rotating speed and the time of ball milling are strictly controlled, intermittent ball milling and external cooling are adopted to control temperature rise and pollution, it is guaranteed that Y2O3 forms nanocrystalline and a dispersion strengthening phase in a Ti matrix, the strength, hardness and thermal stability of the alloy are improved, the process is controllable, and repeatability is good.

The application discloses a pulse current-based crack-free heat treatment method for additive manufacturing of high-temperature alloy, and belongs to the technical field of heat treatment of additive manufacturing of high-temperature alloy. The application aims to solve the technical problem that nickel-based high-temperature alloy manufactured by additive manufacturing is prone to cracking during the heating process of stress relief heat treatment. The application directly heats the workpiece by using pulse current, and the average heating rate of the workpiece is not less than 100 DEG C / s by applying high-density pulse current, so that the superfast heating far exceeding traditional furnace heat treatment is realized, thereby the precipitation of harmful phase at the grain boundary during the heating process is inhibited, and the cracking problem in the stress relief heat treatment process is fundamentally avoided. The method is especially suitable for nickel-based high-temperature alloy such as IN738LC.

This invention discloses a beauty-enhancing and sleep-aiding herbal liqueur and its preparation method. The beauty-enhancing and sleep-aiding herbal liqueur comprises the following raw materials in parts by weight: 100 parts rice, 15-32 parts of a first herbal composition, and 98-137 parts of a second herbal composition; it also includes a compound koji, the mass of which is 0.28-0.32% of the mass of the rice. This invention, by preparing a compound koji suitable for beauty-enhancing and sleep-aiding herbal liqueur, deeply integrates the medicinal materials into the fermentation agent koji, transforming the medicinal materials from "the object of action" into "participants and guides in the fermentation process," serving as a functional fermentation engine. It constructs a new dual-effect fermentation process combining "directed base wine fermentation" and "secondary fermentation of extracts." The resulting beauty-enhancing and sleep-aiding herbal liqueur has a high content of core active ingredients, a good flavor, and strong palatability, which can simultaneously meet the two major needs of internal sleep regulation and external skin improvement, achieving the effect of "internal nourishment and external protection."

The invention belongs to the technical field of metal-based composite materials, and relates to a multi-scale ceramic phase reinforced 750 DEG C-resistant titanium-based composite material and a preparation method thereof. The composite material is formed by compounding a matrix and multi-scale ceramic, the multi-scale ceramic phase is micron-scale titanium boride and nano-scale lanthanum oxide, the matrix is a near-alpha type Ti-Al-Zr-Sn-Mo-Nb-W-Si alloy, the mass parts of all elements including 6-8 mass parts of Al, 7-9 mass parts of Zr, 5-7 mass parts of Sn and the like are stipulated in the matrix, and through quantitative adding and in-situ reaction of LaB6, the multi-scale ceramic phase and the near-alpha type Ti-Al-Zr-Sn-Mo-Nb-W-Si alloy can be obtained. The total content of micron TiB and nano La2O3 is precisely regulated and controlled (the total integral number of the reinforced phase is increased by about 2.3% every time the increase of LaB6 is 0.5%), the in-situ generated reinforced phase is firmly combined with a matrix interface, impurity pollution is avoided, and the problems of agglomeration and interface combination of externally added ceramic particles are avoided.

The application relates to the technical field of superhard material synthesis equipment control, and discloses a cubic press automatic pressure relief system and method, which comprises a central control unit, wherein the central control unit is electrically connected with a UPS module, a pressure sensor and a stepping motor driving module; the stepping motor driving module is electrically connected with a pressure relief execution mechanism; the pressure relief execution mechanism comprises a pressure relief valve and a stepping motor, and the stepping motor is in transmission connection with a valve core of the pressure relief valve; wherein the pressure sensor collects hydraulic system pressure in real time and feeds back to the central control unit, forming pressure closed-loop control; the application can overcome the defects of the prior art, such as unstable three-stage pressure relief, high energy consumption, manual power failure emergency, slow response, low control precision, poor safety and the like, so as to realize normal working condition accurate pressure relief, power failure instant fast, stable and controllable automatic pressure relief, and guarantee diamond synthesis quality and equipment safety.

The present application relates to the technical field of vacuum coating, in particular to a rotating-evaporation rate collaborative control method and system based on deposition distribution model, which establishes a deposition process model containing an evaporation source distribution model, a substrate kinematics model and a cumulative dose model; based on the model, a rotating speed ω(t) and an evaporation rate R i (t) are optimized variables, a collaborative control trajectory is generated through multi-objective optimization; the trajectory is executed; and deposition state data is obtained in real time during the coating process, compared with the model prediction value, the model parameters are corrected online and the trajectory is regenerated, realizing rotating-evaporation rate collaborative control. The method first promotes the rotating speed from a fixed parameter to an active control variable, optimizes it collaboratively with the evaporation rate, increases a completely independent control degree of freedom, fundamentally breaks through the uniformity and component precision upper limit of traditional single-variable control, and solves the poor uniformity problem of perovskite photovoltaic components in the prior art.

The application relates to the technical field of semiconductor photoelectric devices and thin film manufacturing, and particularly discloses a preparation method of a light detector based on a sputtering hybrid semiconductor thin film. The prepared light detector comprises, from bottom to top, a transparent conductive substrate, a bottom charge transport layer, a hybrid semiconductor light absorption layer, a top charge transport layer and a metal electrode. The hybrid semiconductor light absorption layer is prepared by using a magnetron sputtering process based on target self-heating. The thermal electron emission effect of the target self-heating is used to excite high-density plasma at a low working voltage, to rapidly and lowly damage the target for sputtering, and to form a dense and pure-phase hybrid semiconductor thin film. The application uses a multi-dimensional method of adjusting the cathode surface magnetic flux, adjusting the working voltage and target self-heating to improve the plasma density in the chamber. While realizing high-speed deposition of 30-500 nm / min, the hybrid semiconductor thin film defect density is reduced and the photoelectric performance of the light absorption layer is improved.

This application provides a plasma etching angle control system and control method. The system includes: an etching chamber, a carrier disposed in the etching chamber, a plasma excitation component for generating plasma, an adjustable bias power supply, a Faraday cage, a sheath potential monitoring unit, and a control unit. The Faraday cage has a conductive cage top spaced apart from the carrier surface, and the plane of the cage is at an angle to the carrier surface. When the adjustable bias power supply applies a bias voltage to it, an asymmetric electric field is formed in the sheath to deflect incident ions. The sheath potential monitoring unit is used to detect the sheath potential at multiple positions along the inclined direction between the top of the cage and the carrier surface. The control unit determines the potential difference based on a preset reference and the sheath potential at each monitoring position and generates a bias correction amount. It controls the adjustable bias power supply to superimpose the bias correction amount onto the target bias voltage and adjusts the Faraday cage bias voltage in real time through closed-loop feedback to ensure that plasma ions are stably incident on the analyte at the target angle.

The application relates to a high-lubricity bearing journal surface structure and a method for obtaining the same, wherein the friction surface of the bearing journal is uniformly staggered with hardened areas of protrusions and relatively recessed journal base material softening areas, the hardness of the hardened areas is 15-25 HRC higher than that of the journal base material, and the protrusion height of the hardened areas is 5-30 mu m. The friction surface with the alternately soft and hard and staggered high and low areas is wear-resistant, improves bearing elasticity, reduces vibration load, can improve the oil capacity of the journal surface, increase the lubricating oil film thickness under low-speed and high-speed conditions, reduce the friction coefficient, improve the lubricating performance, and prolong the journal fatigue life. The journal structure is realized through an electrolytic plasma local heat treatment method, the manufacturing process can be automated, the process is energy-saving, environment-friendly and efficient, and the risk of overall deformation of large journal parts is eliminated.

The invention discloses hollow Silicalite-1 zeolite with controllable mesopores as well as a preparation method and application of the hollow Silicalite-1 zeolite, and the obtained Silicalite-1 zeolite is composed of a mesoporous shell with adjustable pore diameter and a hollow inner cavity. The Silicalite-1 zeolite is provided with a hollow cavity, sufficient space is provided for amine loading, a shell layer is provided with a mesoporous structure with the pore diameter adjustable in the range of 2-20 nm, and amine molecule dispersion and CO2 diffusion efficiency are both considered. The invention further provides a solid amine CO2 adsorbent, high-capacity loading and good dispersity of amine and efficient diffusion of CO2 are synchronously achieved through a composite structure of a hollow cavity and a controllable mesoporous shell layer of a zeolite carrier, and the tradeoff limitation of a traditional carrier between mass transfer and loading is broken through. The adsorbent can be used for capturing CO2 in medium and low temperature flue gas. According to the invention, the problems of poor amine dispersibility, large CO2 diffusion resistance, low adsorption capacity, easy inactivation and the like caused by narrow pore channels of the zeolite carrier of the existing solid amine adsorbent are solved.

This invention discloses a composite preform for aluminum-steel induction brazing, a welding method, and an anode guide rod assembly. The composite preform includes an aluminum base skeleton and annular brazing filler metal on its upper and lower surfaces. The aluminum base skeleton is disc-shaped with through holes, through which the annular brazing filler metal is connected as a whole. The annular brazing filler metal includes an inner ring wetting zone, a middle ring control zone, and an outer ring compensation zone, with the solid-liquid phase temperature of the brazing filler metal increasing sequentially in these three zones. During welding, a two-stage induction heating process is employed: first, the inner ring brazing filler metal is fully softened and spread in the central region; then, the outer ring brazing filler metal is completely melted and fed to the joint edge, while a controlled Fe-Al-Si reaction layer is formed at the steel-side interface through the middle ring control zone. This invention transforms the inherent radial temperature difference of induction heating into a step-by-step melting process window, simultaneously solving the problems of insufficient central spreading, edge brazing filler metal loss, and uncontrolled brittle phase at the interface. It is suitable for large-section connections between anode steel claws and aluminum guide rods in the electrolytic aluminum industry.

The present application relates to the technical field of biological nanomaterials, in particular to a multi-level structure calcium phosphate nanomaterial, a preparation method and application thereof.The present application prepares small-scale calcium phosphate nanoparticles through a biomimetic mineralization strategy, and then crosslinks the same with L-lysine or cystamine dihydrochloride through an EDC / NHS-mediated amide coupling method to form a size-controllable multi-level structure aggregate.Compared with the small-scale calcium phosphate nanoparticles, the multi-level structure, as a doping matrix of metal ions such as Cu and Mn, significantly improves the catalytic efficiency of the metal ions, as a drug carrier, improves the loading capacity of the drug, and the multi-level structure shows a higher tumor accumulation effect.The present application has a simple preparation method, can realize the size regulation of the multi-level structure calcium phosphate nanomaterial, and can realize the tumor microenvironment-responsive disintegration of the multi-level structure.The method has good process repeatability and high batch stability, is suitable for developing high-performance nanodrugs, and has good application potential in the biomedical field.

This invention belongs to the field of wet electronic chemical purification, specifically relating to a membrane chromatography filter membrane for removing charged ions from liquids and its preparation method, including the following steps: S1, preparing casting solutions: preparing positively charged layer casting solutions, neutral layer casting solutions, and negatively charged layer casting solutions separately; S2, using a three-layer die to sequentially extrude the positively charged layer casting solutions, neutral layer casting solutions, and negatively charged layer casting solutions onto a polyester film; S3, exposing the casting solutions under set temperature, humidity, and airflow conditions to allow for initial phase separation; S4, immersing the coated film in a pure water coagulation bath to complete phase separation and solidification; S5, rinsing, drying, and then winding to obtain the membrane chromatography filter membrane. By designing a special three-layer composite structure with a "positively charged layer-neutral layer-negative layer," the filter membrane can simultaneously adsorb anions and cations in the solution during a single filtration process, overcoming the limitation of traditional single-charge membranes that can only remove one type of ion, thus improving purification efficiency.