6 results about "Mass diffusion" patented technology

The invention discloses an interface fusion welding method and equipment, and belongs to the technical field of diffusion welding. The problem that in the metal diffusion welding process, in order to form tight interface contact, external pressure is excessively relied on, and consequently the deformation amount of base metal is large is solved. And meanwhile, the problem that the temperature of a welding interface is not uniform in traditional welding is solved. The method comprises the following steps: polishing the high-temperature alloy until no obvious scratch exists on the surface, sequentially carrying out ultrasonic cleaning with acetone and absolute ethyl alcohol, and drying; fixing the sample on a sample table of a magnetron sputtering device, vacuumizing, introducing inert gas, carrying out magnetron sputtering on nickel and aluminum at the same time, and then carrying out magnetron sputtering on silver; then, placing in absolute ethyl alcohol for ultrasonic cleaning, placing in a NaOH solution, heating in a water bath for immersion cleaning, and washing with deionized water; then, putting into an HCl solution, carrying out immersion cleaning, washing with deionized water, carrying out ultrasonic cleaning with absolute ethyl alcohol, and drying; and then laminating the plated surface, and performing magnetic field-assisted induction heating diffusion welding. Small-deformation and high-quality diffusion welding of metal at a relatively low temperature is achieved.

The application belongs to the technical field of composite material preparation, and particularly relates to a preparation method and application of a B-NiCo2O4@NiCo-MOF composite material. Boron-modified nickel cobaltate is prepared, and is used as a precursor to prepare the B-NiCo2O4@NiCo-MOF composite material through a hydrothermal method. The electronic structure of the NiCo2O4 is regulated through B, which effectively improves the conductivity and active site exposure of the material. In combination with the porous characteristics of the NiCo-MOF, the composite material with a hierarchical structure is formed, the synergistic optimization of electronic transmission and mass diffusion is realized, and the composite material is applied to the preparation of a supercapacitor positive electrode, so that the specific capacity and rate response performance of the electrode material are improved, and the supercapacitor has high energy density and super-long service life.

The invention discloses a numerical analysis method for quantifying differential diffusion in coal / ammonia blending combustion, and belongs to the technical field of coal / ammonia co-combustion numerical simulation. The method comprises the following steps: establishing a gas-solid two-phase control equation and a total mixed fraction general transport equation based on element conservation, and defining exclusive difference diffusion quantization parameters; a non-unity constant Lewis number is adopted to calculate mass diffusion, a model is discretized through a PIMPLE algorithm, and a speed-pressure field is coupled; combustion characteristic data are obtained through CP-DNS solving, and the influence rule of difference diffusion on component distribution and a temperature field is compared and analyzed. According to the method, the problem of incomplete physical process characterization caused by the fact that a traditional model ignores differential diffusion is solved, the diffusion difference of heavy / light components and the effect on the combustion process can be systematically quantified, and a reliable numerical tool is provided for optimization design of a coal / ammonia co-combustion system.

This invention discloses a numerical analysis method for quantifying differential diffusion in coal / ammonia co-combustion, belonging to the field of numerical simulation technology for coal / ammonia co-combustion. The steps include: establishing gas-solid two-phase governing equations and a general transport equation for the total mixture fraction based on element conservation; defining specific differential diffusion quantification parameters; calculating mass diffusion using a non-unity constant Lewis number; discretizing the model using the PIMPLE algorithm and coupling it with a velocity-pressure field; obtaining combustion characteristic data through CP-DNS solution; and comparing and analyzing the influence of differential diffusion on component distribution and temperature field. This invention solves the problem of incomplete physical process characterization caused by traditional models neglecting differential diffusion, and can systematically quantify the diffusion differences of heavy / light components and their effects on the combustion process, providing a reliable numerical tool for the optimized design of coal / ammonia co-combustion systems.

The invention discloses a project-oriented potential scientific research team mining method based on network diffusion, and the method comprises the following steps: obtaining and preprocessing academic data, and constructing an author-paper bipartite graph network; initializing a seed paper set according to a reference coupling relationship of the target subject, and constructing an initial influence signal in a paper layer of the bipartite graph network; parallelly executing two network diffusion processes of mass diffusion and heat conduction on the bipartite graph network, and respectively calculating to obtain an author influence vector and an author influence vector under a heat conduction mechanism; normalizing the two obtained author influence vectors, and performing linear weighted fusion by adjusting parameters to obtain a final mixed influence vector; sorting all authors according to the mixed influence vector, and selecting the top authors as potential scientific research team recommendation; the method is suitable for scientific research environments in different periods.

The invention discloses a gastrodia elata quality nondestructive testing system based on a hyperspectral imaging technology, and relates to the technical field of gastrodia elata processing equipment.The gastrodia elata quality nondestructive testing system is characterized in that the system is connected in series according to S1-S6: PRI, BWI and time constants are collected and extracted according to temperature and humidity perturbation and time sequence; thermal / mass diffusion generates a depth weight D (x, y) to inhibit surface dominance; multi-angle reflection and diffuse transmission imaging are carried out to obtain multiple geometric spectrums; carrying out physical micro body rendering inversion in combination with non-negative unmixing, and outputting voxel distribution and virtual slices of water, polysaccharide, gastrodin, p-hydroxybenzyl alcohol, parishin, starch and the like; if not, triggering photoacoustic calibration to obtain density and a cavity mask; the consistency of fusion dynamic, imaging and acoustics is updated through the posteriori of the serial product formula; and generating a TFC fingerprint code through posterior distillation and optimizing few bands, thereby realizing second-level online grading and low-cost deployment. According to the system, dynamic, structural and chemical three-dimensional information is synchronously obtained without damaging a sample, the accuracy, depth resolution and robustness are improved, and the system is suitable for production line quality control and traceability.