22 results about "Dense packing" patented technology

The invention relates to the technical field of crossing of road engineering and computer vision, and discloses a densely-stacked asphalt mixture particle roundness distribution prediction method, which comprises the following steps of: performing instance segmentation on particles in an image by adopting a visual basic model to obtain a mask image of each particle in the image; analyzing each particle mask image, extracting morphological parameters including the area, the equivalent circle diameter, the equivalent ellipse long axis and the like, constructing a particle geometric feature set, constructing a distribution curve for each morphological parameter according to the number of particles, and performing equal-interval sampling on the curve to form a multi-dimensional feature vector for machine learning input; and constructing a recurrent neural network model, and training the model by taking the multi-dimensional feature vector as an input and the known particle roundness distribution as a label to realize prediction of the particle roundness number distribution in the new image. And the segmentation applicability and the roundness distribution prediction precision of the densely-stacked asphalt mixture image are obviously improved.

Provided in the present application are a sodium-ion battery positive electrode precursor having a core-shell structure, a manufacturing method therefor, and the use thereof. Said precursor comprises a core and a shell on the surface of the core, the core comprising NiaFebMn1-a-b-cMc(OH)2, wherein 0.3≤a≤0.5, 0.2≤b≤0.4 and 0≤c≤0.01, and the shell comprising NixCuyFezMn1-x-y-z-vNv(OH)2, wherein 0.1≤x<0.3, 0.02≤y≤0.2, 0.2≤z≤0.4 and 0≤v≤0.01, and the shell containing pores. In said precursor of the present application, primary particles of the core are of a dense packing while primary particles of the shell are of a loose packing, so that compaction density, energy density, porosity and specific surface area of the material are improved, thus improving properties of the material.

The invention discloses a soluble microneedle loaded with high-dose microspheres, which comprises a substrate and a needle body, and the needle body is internally loaded with biodegradable microspheres in a compact stacking state. Biodegradable microspheres are coated in a needle body of a microneedle array through a soluble material, so that the soluble microneedle which is loaded with the biodegradable microspheres in a compact stacking state and is high in loading capacity is obtained, and the material selection and the structural design of the soluble microneedle are optimized; the microneedle array with various needle body lengths, geometric configurations and arrangement densities can be prepared according to different clinical requirements, and uniform distribution and dense filling of biodegradable microspheres in the needle body are realized, so that efficient delivery of the microspheres is guaranteed. Meanwhile, the biodegradable microspheres can be delivered to the required subcutaneous depth along with dissolution of the needle body by adjusting the length of the needle body, and a safe, effective and non-invasive technical path is provided for percutaneous delivery of the biodegradable microspheres.

The invention discloses an automatic optimal selection method and system for coarse aggregate close packing continuous grading, and belongs to the technical field of building materials. The method comprises the following steps: S1, taking a plurality of parts of dense mixed aggregates with the same volume, wherein the proportions of aggregates with various particle sizes in each part of the mixed aggregates are different; s2, respectively weighing the mixed aggregates to obtain a plurality of total weights; s3, respectively screening the mixed aggregates, and weighing the screened aggregates with different particle sizes; s4, judging whether the current group of mixed aggregate is reserved or not according to the weight of all or part of the screened aggregate with the particle size level and the maximum weight and the minimum weight corresponding to each level; when the aggregate weights all meet yminlt; yjlt; yjt; when ymax is greater than ymax, the mixed aggregate proportion corresponding to the group of data is reserved; and S5, selecting the group with the maximum total weight from the retained mixed aggregates, and taking the proportion corresponding to the group as a preferable proportion. According to the invention, the blending proportion of each grade of materials during close packing continuous grading can be automatically obtained.

The application belongs to the technical field of thermoelectric device preparation and connectors, and aims to solve the problem of Te 0.985 Sb 0.015 During the connection of thermoelectric materials and Ni electrodes, a large number of aggregated pores and segregation of doped elements Sb are generated at the interface, which seriously weakens the electrical transport performance and thermal stability at the interface. A method for improving the performance and thermal stability of Te-based thermoelectric arms by using topological dense packing is provided. A topological dense packing NiTe 2‑x , 0≤ x ≤0.9 is synthesized by a solid phase reaction method, which is introduced into the Ni and Te 0.985 Sb 0.015 between them to form a Ni / NiTe 2‑x / Te 0.985 Sb 0.015 / NiTe 2‑x / Ni gradient connection structure. The problem of a large number of aggregated pores and segregation of doped elements Sb due to the severe diffusion of Ni into Te 0.985 Sb 0.015 and reaction at the interface is successfully eliminated, and the performance and service life of the thermoelectric connector are improved.

The application discloses a preparation method of a single-crystal metal lithium negative electrode. The single-crystal metal lithium negative electrode with a dense packing surface Li(110) is obtained by annealing a polycrystal metal lithium foil horizontally placed after being heated in vacuum or inert atmosphere, and is directly used for battery assembly. The application remarkably improves the electrode reaction process kinetics of the metal lithium negative electrode by reducing the self-diffusion barrier of the surface of the metal lithium negative electrode, widens the safety boundary of the metal lithium negative electrode, and enables the metal lithium negative electrode to have no dendrite growth in a practical current density range. The prepared single-crystal metal lithium negative electrode can be directly used for battery assembly, and remarkably improves the cycle stability and safety of a high-specific-energy metal lithium battery, and promotes the development of practical high-safety metal lithium batteries.

The application provides a UAV cluster self-organizing flight method, system and UAV, comprising: based on the proposed boundary constraint triangular dense packing method, using an independent reinforcement learning evaluation unit structure fitness, based on the fitness applying an evolution algorithm to obtain the optimal formation unit structure of the UAV cluster, and a UAV strategy model capable of flying to reach the unit structure; transforming the UAV parameters, pre-training to construct a UAV strategy model library, determining the strategy model matched with the performance parameters of the UAV cluster from the strategy model library; based on the task information, based on the observation of the flight information of the adjacent UAVs of each UAV and the selected strategy model, determining the strategy action of each UAV; the application can be used for the UAV cluster self-organizing flight under the communication denial and local observation restriction based on the structure evolution dense packing formation and the independent reinforcement learning based on the single-agent perspective; meanwhile, the technical scheme provided by the application is easy to understand, simple to implement and has wide applicability.

The application discloses a kind of earth-rock dam construction feed control optimization methods considering dam rockfill gradation spatial variability, comprising: using unmanned aerial vehicle to obtain the image of earth-rock dam surface, and the image is pretreated;Fractal dimension of rockfill filling warehouse surface image is obtained by "box" dimension method, and potential dense packing pore ratio and other information of in-situ gradation rockfill are predicted according to accumulation algorithm;The above steps are repeated at different positions and different elevations of earth-rock dam filling warehouse surface, and the state-dependent constitutive theory of rockfill is used to obtain the distribution of overall mechanical properties of earth-rock dam;According to the overall mechanical property distribution, the deformation law of dam body during construction is quickly predicted, and the subsequent construction feed control optimization scheme is made according to the set deformation threshold value.The application can quickly and non-destructively obtain the gradation information of rockfill and optimize the construction, reduce the economic and time cost, and improve the construction quality and stability of earth-rock dam.

The application relates to the technical field of building materials, and discloses a phosphogypsum aggregate vegetation concrete and a preparation method thereof. Raw phosphogypsum, solid waste admixture and an alkaline activator are mixed and proportioned to prepare cold-bonded artificial aggregates with single particle size and high sphericity, so as to prepare the phosphogypsum aggregate vegetation concrete. The application utilizes the acidity and soluble phosphorus elements of the phosphogypsum to perform alkali reduction treatment on the vegetation concrete and provide nutrients for plant growth; meanwhile, the hydration product can adsorb and solidify the soluble phosphorus, fluorine and heavy metal elements in the phosphogypsum, hinders the large-scale migration of the elements to the natural environment, eliminates the environmental risks caused by the direct utilization of the raw phosphogypsum, and provides high-quality raw materials for high-performance pervious concrete. In addition, according to the spherical dense packing and slurry wrapping theory, the mix proportion of the phosphogypsum aggregate vegetation concrete is optimized and designed, so that the connected porosity, the water permeability coefficient and the compressive strength of the pervious vegetation concrete can be adjusted and customized.

The present application relates to the technical field of covalent organic framework material, in particular to a hierarchical pore alkenyl covalent organic framework material and a preparation method and application thereof.The present application comprises the following steps: preparing a dense packing structure microsphere solid, adding a ligand of a covalent organic framework into the microsphere solid, obtaining a microsphere solid-covalent organic framework composite by controlling reaction conditions, removing the microsphere solid in the composite to form a pore, and obtaining the hierarchical pore alkenyl covalent organic framework material.The covalent organic framework material itself has a nanoscale pore, and the dense packing structure microsphere solid is introduced to divide the ligand of the covalent organic framework to form the smallest ligand of the covalent organic framework, which is more conducive to forming the hierarchical pore.The microsphere solid in the microsphere solid-covalent organic framework composite occupies most of the space, and a large number of cavities are left after the microsphere solid is removed, and a mesopore is formed at the connection between the macropore and the micropore, so that the alkenyl covalent organic framework material with the hierarchical pore structure is finally obtained.

The application discloses a superfine powder-micromolecule alcohol dual-phase synergistic UHPC viscosity reducer and a preparation method thereof, and belongs to the technical field of admixtures for building materials. The superfine powder is used to prepare the viscosity reducing admixture, dense packing is realized through multi-scale particle filling, the friction between particles is reduced, a graded continuous particle system is formed, the demand for free water is reduced, and the slurry fluidity is significantly improved. Meanwhile, through the dispersion of the polycarboxylic acid high-performance water reducing agent, the lubrication and hydration regulation of the micromolecule alcohol, the synergistic optimization of the air entraining agent and the defoaming agent on the bubble system, and the retardation of the setting retarder on the hydration process, a multi-scale synergistic viscosity reduction mechanism is formed, the slurry yield stress and plastic viscosity are significantly reduced, high strength and durability are maintained, and the application is suitable for the efficient viscosity reduction and working performance optimization of the low water-binder ratio UHPC system.

The utility model relates to a drying device for micron-sized metal powder, which comprises a drying oven and at least one displacement unit arranged in the drying oven, and a powder tray is correspondingly arranged below each displacement unit; the displacement unit comprises a powder laying scraper, a height adjusting mechanism and a horizontal movement mechanism fixedly connected with at least one height adjusting mechanism. According to the drying device, the distance between the powder spreading scraper and the powder tray can be set to be consistent with the particle size of the powder through the height adjusting mechanism according to the particle size of the powder, the metal powder to be dried is evenly spread on the powder tray through the powder spreading scraper, and the thickness of the spread powder layer is close to the particle size of the powder; and powder particles are densely arranged in a single layer or double layers, so that moisture in gaps of the metal powder is quickly evaporated, and the powder drying thoroughness is further ensured. And meanwhile, the thickness of the tiled powder layer can be realized according to specific requirements.

The application discloses a preparation method of alumina ceramic by dry pressing, and belongs to the technical field of ceramic preparation. The method comprises the following steps: S1, powder pretreatment and granulation: high-purity alpha-alumina powder is granulated to obtain spherical granulated powder; S2, mold pretreatment and powder filling: the spherical granulated powder is sieved and then filled into a mold cavity and vibrated to a dense packing state; S3, multi-stage gradient pressing: pressure is applied to the mold, and the pressing process is divided into three stages: a pre-pressing stage, in which the pressure is slowly increased to 20-50 MPa at a rate of 5-15 MPa / s, and the pressure is kept for 10-30 seconds; a main pressing stage, in which the pressure is rapidly increased to 80-90% of the final forming pressure at a rate of 10-30 MPa / s; and a fine pressing stage, in which the pressure is slowly increased to the final forming pressure at a rate of 2-8 MPa / s, and the pressure is kept; S4, controllable-speed demolding: after pressure relief, the green body is smoothly separated from the mold cavity; and S5, green body post-treatment and sintering: after drying, the green body is placed in a high-temperature sintering furnace for glue removal and sintering to obtain alumina ceramic.

The invention discloses slag-based low-carbon ecological concrete with shells replacing coarse and fine aggregates, which is characterized in that waste shells are graded by 100% to replace natural gravel coarse and fine aggregates, and are matched with a slag-cement-gypsum ternary low-carbon gel system; the core ratio of concrete per cubic meter of 1 m < 3 > is defined as follows: 275-295 kg of slag, 42-58 kg of cement, 62-78 kg of gypsum, 2080-2160 kg of waste shells and 1.1-1.9 kg of a polycarboxylate superplasticizer, the water-cement ratio is 0.45-0.50, and the mortar-sand ratio is 1: 2. During preparation, a process of dense accumulation of coarse aggregate and pouring of gelled slurry is adopted, the highest compressive strength of the cured concrete within 28d reaches 45.7 MPa, the lowest chloride ion permeation resistance electric flux is 746.38 C, and the alkalinity is controlled between 9.42 and 11.68. Compared with the prior art, 2080-2160 kg of waste shells and 97.125 kg of fixed carbon can be consumed by 1 m < 3 > of concrete, carbon emission is reduced by 35% or above, the total cost is about 270 yuan, the technical breakthrough of waste recycling, low-carbon emission reduction and multi-performance cooperation is achieved, and the concrete is suitable for ecological engineering such as artificial fish reefs and marine ranches.

This invention discloses an automatic optimization method and system for continuous gradation of coarse aggregate with dense packing, belonging to the field of building materials technology. The method includes: S1: taking several portions of dense mixed aggregate of the same volume, each portion containing a different proportion of aggregates of various particle sizes; S2: weighing the selected mixed aggregates to obtain a total weight; S3: sieving the selected mixed aggregates and weighing the sieved aggregates of each particle size grade; S4: determining whether to retain the current group of mixed aggregates based on the weight of all or part of the sieved aggregates of each particle size grade, as well as the maximum and minimum weights corresponding to each grade; when the aggregate weights all meet the requirements... y min < y j < y max S5. Select the group with the largest total weight from the retained mixed aggregates and use the ratio corresponding to that group as the preferred ratio. This invention can automatically obtain the blending ratio of each grade of material in a closely packed continuous gradation.

The invention relates to a projectile (10), in particular a medium-caliber projectile for mobile and stationary air, naval and tank guns, comprising: - several subprojectiles (12), each having a longitudinal axis S and a shape that is essentially cylindrically symmetric about this axis; - a shell (14) comprising a payload chamber (16) which is substantially coaxial to a longitudinal axis G of the projectile (10) and in which the subprojectiles (12) are received; where - the subprojectiles (12) in a first position, which is essentially perpendicular to the longitudinal axis G, are arranged rotationally symmetric to the longitudinal axis G such that no subprojectile (12) is located on the longitudinal axis G. In order to improve the utilization of the specified payload chamber in such a projectile (10), it is provided that: - for the number N1 of subprojectiles (12) N1 = 3n1, where n1 is a positive integer; - the subprojectiles (12) are arranged in a densest packing with threefold rotational symmetry about the longitudinal axis G such that each subprojectile (12) touches at least two adjacent subprojectiles (12).

Described is among other things an immersion module (100). The immersion module can provide for more even cooling and dense packing of heat generation components (160) such as batteries.

The application relates to the cross field of nanofluid mechanics and interface chemistry, and specifically discloses a kind of nanobubble stability dynamic analysis and life prediction method, establishes double hyperbolic pressure balance equation considering inter-ring electrostatic repulsion, constructs concentric ring dense packing ion distribution model, deduces the series expression of surface hydroxyl ion dynamic adsorption;Propose the diffusion layer Prandtl number correction method based on Brown motion correction, realize the accurate calculation of dynamic mass transfer parameter;Establish the multi-dimensional coupled nanobubble radius change rate equation, establish the critical stable radius criterion and the closed solution of life prediction. The application breaks through the plane hypothesis limitation of traditional Young-Laplace equation, solves the technical problem of large deviation of existing nanobubble model theoretical prediction through multi-physical field coupling modeling and experimental parameter joint debugging.

The invention relates to the crossing field of nanofluid mechanics and interface chemistry, and particularly discloses a nanobubble stability dynamic analysis and life prediction method, which comprises the following steps: establishing a hyperbolic pressure balance equation considering inter-ring electrostatic repulsion, constructing a concentric ring close packing ion distribution model, and deducing a series expression of surface hydroxyl ion dynamic adsorption; a diffusion layer Prandtt number correction method based on Brownian motion correction is provided, and accurate calculation of dynamic mass transfer parameters is achieved; and establishing a multi-dimensional coupled nanobubble radius change rate equation, and establishing a critical stable radius criterion and life prediction closed solution. According to the method, the plane hypothesis limitation of a traditional Young-Laplace equation is broken through, and the technical problem that the theoretical prediction deviation of an existing nano bubble model is large is solved through multi-physics field coupling modeling and experimental parameter joint debugging.

The present application relates to the technical field of electronic packaging interconnection, and discloses a multi-scale copper sintering paste, a preparation method and application thereof.A multi-scale copper sintering paste is composed of 85wt.% of multi-scale copper particles and 15wt.% of raw materials of an organic system.The multi-scale is a mixture of nano-scale, sub-micron scale and micron scale; and the organic system includes a solvent, a diluent, a dispersant and a binder.The multi-scale copper sintering paste of the present application realizes low-temperature dense sintering interconnection by using multi-scale copper particles for dense packing, and can obtain an interconnection head with high strength (≥90MPa), high thermal conductivity (≥300W / m·K) and high electrical conductivity (≥1×10 7 S / m), which meets the process and performance requirements of third-generation semiconductor chips and electronic packaging interconnection.

A dynamic robotic packaging approach places a set of objects in a containment or shipping container based on dynamic, or real time evaluation and imaging of the set of objects for placement. Predefined object dimensions need not be provided, as an RGB-D or similar imaging provides a representation of each object in a set of objects for packaging. A sensed point cloud of each object is employed to compute a sphere tree, which is ordered according to sequencing logic for placing the object in the containment. Placement order is based on a prioritized score for tightly packing the most unwieldy or largest objects first. A no-fit volume is computed around each object, including accommodations for object orientation and deformation against adjacent objects. A final placement disposes the irregularly shaped objects in a close adjacency for optimal utilization of containment volume.

This application relates to the field of semiconductor packaging technology, and particularly to modified copper paste, its preparation method, and its application. The modified copper paste comprises a copper coordination compound, submicron-sized copper powder, micron-sized copper powder, resin, resin curing agent, and solvent. The copper coordination compound exhibits high dispersibility, and during the subsequent sintering process, nano-sized copper particles are generated in situ throughout the copper paste, leveraging the nanoscale effect to effectively reduce the required sintering temperature and pressure. Through the multi-scale particle size distribution of micron-sized, submicron-sized, and nano-sized copper powder, effective filling between particles is achieved during sintering, forming a gradient particle size distribution and achieving the densest packing. This not only significantly improves the density of the solder layer and the interfacial bonding strength, enhancing connection strength and reliability, but also optimizes the conductive path. As a semiconductor bonding material, this modified copper paste exhibits high bonding strength, lifespan, and conductivity after sintering, significantly improving the quality of power packaging.