67 results about "Rhombic dodecahedron" patented technology

The invention provides a three dimensional earth pressure testing device based on general earth pressure cells and a rhombic dodecahedron. According to the device, six general earth pressure cells are fixed onto six surfaces, of which the normal vector quantities are uncorrelated, of the rhombic dodecahedron, so that the three dimensional earth pressure testing device is formed; grooves used for accommodating earth pressure cells are arranged on the surfaces of the rhombic dodecahedron with uncorrelated normal direction vector quantities; a conducting wire hole leading to the centroid of the rhombic dodecahedron is formed in the center of each groove; a conducting wire converging hole leading to the centroid is formed in each surface center of the rhombic dodecahedron except the grooves, so that six conducting wire holes and the converging holes converge at the centroid; meanwhile, a method for assembly and compute the three dimensional earth pressure testing device is provided. The invention has the effect that the three dimensional earth pressure testing device obtain, through testing, three principal stress of the earth pressure in the principal directions with measuring accuracy of 1.22 Rho, the measuring accuracy of three shearing stress is 0.71 Rho, the average measuring accuracy is 0.965 Rho, the safety storage of the engineering construction is improved, and the health condition of the engineering in later period can be effectively evaluated.

The invention relates to a difunctional oxygen catalyst cobalt/cobaltosic oxide/nitrogen carbon composite material and a preparation method thereof. The invention belongs to the fields of a fuel cell and a metal-air cell, and concretely relates to the difunctional oxygen catalyst cobalt/cobaltosic oxide/nitrogen carbon composite material and the preparation method thereof. The composite material solves the problems of high cost and no high catalytic activity of the oxygen catalysts in the prior art. The product is the difunctional oxygen catalyst cobalt/cobaltosic oxide/nitrogen carbon composite material having a rhombic dodecahedron morphology. The method comprises the following steps: 1) preparing a ZIF-67 precursor; 2) preparing Co-coated CoO/NC; and 3) preparing Co-coated Co3O4/NC. The composite material presents the excellent difunctional oxygen electrode catalytic activity, and presents good stability in the Co-coated Co3O4 nano particles having a shell-core structure in an alkaline solution sealed in graphitized N-doped porous carbon.

The present invention relates to a carbon nanotube encapsulated cobalt and oxide (CoO and Co3O4) nanosphere absorbing material thereof and a preparation method thereof, and belongs to the electromagnetic wave absorbing material technology field. The micro-morphology of the absorbing material is a hollow rhombic dodecahedron structure composed of the carbon materials, the carbon nanotubes grow on the surface of the rhombic dodecahedron structure, and a cobalt and an oxide nanosphere thereof are encapsulated at the end at the outer side of each carbon nanotube. The size of the rhombic dodecahedron structure is 400-550nm, the external diameter of each carbon nanotube is 14-16 nm, and the internal diameter is 11-13 nm; the diameters of the cobalt and the oxide nanosphere thereof are 11-13 nm,the proportion of the amorphous carbon and the graphitized carbon in the absorbing material is 1: 0.79-1.17, and the saturation magnetization intensity of the absorbing material is 27.83-39.4 emu/g; the maximum electromagnetic wave absorption exceeds -40 dB, and an effective absorption range exceeds 4.5 GHz. After using the 1M sulfuric acid or 1M ammonia to process 6-12 hours, the maximum electromagnetic absorption of the absorbing material still exceeds -40 dB, and the effective absorption range exceeds 4.5 GHz, thereby having the immense potential at the aspect of the electromagnetic wave absorbing material.

The invention provides a device for testing a three-dimensional strain state inside a soil mass. Six common strain gauges of the device are sequentially fixed onto strain gauge bases on six surfaces with uncorrelated normal vectors of a rhombic dodecahedron, and lead holes leading to the center of the rhombic dodecahedron are formed in centers of the six surfaces with the uncorrelated normal vectors of the rhombic dodecahedron and connected with a data acquisition system through measuring leads. Besides, the invention further provides a testing method of the device for testing the three-dimensional strain state inside the soil mass. The device has the advantages that the three-dimensional strain state of a certain position of the soil mass is more accurately tested, linear strain in a maximum main strain direction can be obtained, among six strain gauge testing values, testing precision of three main strain gauges is 1.22 rho, testing precision of three shearing strain gauges is 0.71 rho, average testing precision is 0.97 rho, strain gauge testing precision in a single direction is improved, and the limitation of only testing surface strain at inaccurate testing positions in the past is changed. The device visually reflects the deformation state inside the soil mass, and safety stock of engineering construction is improved.

The invention relates to water-soluble sodium halide micro-particles, and a preparation method an application thereof. The water-soluble sodium halide micro-particles has a sodium-chloride-type crystal structure and at least one morphology and dimension of the following: the particles are cube, rhombic dodecahedron, regular octahedron, sphere or sphere-like shape, hexagonal-shaped petals or hexagonal star-shape, six-sided funnel-shape, octagonal-shaped petals, or nano-wires with three-dimensional size of 50 nanometers to 20 micrometers.

The invention discloses a 3D printing preparation method for a high-strength titanium alloy part of a porous structure, and belongs to the field of 3D printing material design and preparation. The method is characterized in that the titanium alloy part of the porous structure is formed by superposing a plurality of rhombic dodecahedron basic units, the interiors of the basic units are hollowed out, four reinforcing supports are arranged in the body diagonal direction, each metal frame is formed by adopting a laser 3D printing technology, and every two adjacent basic units share one surface. The method has the advantages that the pore size of the porous material obtained through the method is small, and the porosity can be controlled by regulating and controlling the dimension parameters ofthe basic units; and the yield strength and the torsional strength of a product are higher than those of a conventional 3D printing porous material under the condition of the same porosity.

The invention relates to diamond-shaped dodecahedron hollow potassium tannate nanoparticles and a preparation method thereof which are characterized in that obtained potassium tannate nanoparticles have diamond-shaped dodecahedron hollow appearance structures and are directly prepared in an aqueous solution based on an acid-base neutralization principle and a dissolution mechanism in a ZIF-8 acid environment under the condition of a room temperature. The preparation method comprises the following preparation steps: (1) firstly preparing a ZIF-8 nanoparticle colloidal solution in an ethylene glycol solution by taking zinc nitrate and 2-methylimidazole as raw materials, centrifugally separating, performing ultrasonic cleaning with alcohol and then dispersing in the aqueous solution; (2) adding potassium hydroxide and a tannic acid aqueous solution into the ZIF-8 aqueous solution under the condition of rapid stirring, uniformly mixing and reacting for 10-60 minutes under stirring at a room temperature; (3) centrifugally separating the prepared colloidal solution obtained in the step (2) at a high speed and performing ultrasonic cleaning to obtain the diamond-shaped dodecahedron hollow potassium tannate nanoparticles. The hollow potassium tannate nanoparticles obtained by the preparation method provided by the invention have important application values in drug transport, UV protection, bacterium resistance, pollutant adsorption and the like.

The invention discloses a coated granatohedron tungsten-tungsten carbide composite material and a preparation method thereof. The tungsten-tungsten carbide composite material is in a tungsten-tungsten carbide coated core shell structure adopting tungsten carbide as a shell and tungsten as a core. The tungsten-tungsten carbide composite material has the features of a granatohedron, and the particle size thereof is 1-4mum. The composite material is simple to prepare, and the particle size distribution of the prepared granatohedron is less than 4mum, therefore, the heat stability is greatly improved.

The three-dimensional lattice structures disclosed herein have applications including use in medical implants. Some examples of the lattice structure are structural in that they can be used to provide structural support or mechanical spacing. In some examples, the lattice can be configured as a scaffold to support bone or tissue growth. Some examples can use a repeating modified rhombic dodecahedron or radial dodeca-rhombus unit cell. The lattice structures are also capable of providing a lattice structure with anisotropic properties to better suit the lattice for its intended purpose.

The invention provides a preparation method of a cobalt selenide/graphite carbon composite material. With Co(NO3)2-6H2O, 2-methylimidazole, methanol and selenium powder as raw materials, through the preparation of a polyhedral metal organic framework compound ZIF-67, the cobalt selenide/graphite carbon composite material is prepared based on MOFs template construction. The ZIF-67 prepared by the invention is a rhombohedral dodecahedron, a framework has a small grain diameter controlled to be about 300nm and is uniform, the specific surface area is large, and the overall distribution is uniform. The composite material of the invention has high crystallinity and high specific surface area and porosity, the homogeneous distribution can be formed, the prepared framework has the small grain size, and the overall distribution is uniform. At the same time, the electric shock capacity is large, the service life is long, the lithium storage performance is excellent and is not degraded after upto 200 times of charging and discharging cycles, the stability of the use process is good, the current is not suddenly large and small, the purity of a product is high, the preparation method of the invention has high yield which can reach 70% or more, the preparation process is simple and feasible, and the method is worth marketing.

The invention relates to a human body personalized hip joint femoral stem prosthesis adopting lightweight design and a manufacturing method thereof, and belongs to the field of medical instruments. The human body personalized hip joint femoral stem prosthesis comprises a handle neck, a handle body, a vertebral body and a vertebral tip, wherein the upper part of the prosthesis is triangular, and the inner side angle is 90-120 degrees; the handle body adopts a hexagonal honeycomb structure unit for lightweight design; the handle body and the vertebral body can also be subjected to lightweight design at the same time, the lightweight design can adopt irregular opening or closing structure design or 3D lattice structure design, and the structural unit is preferably a diamond unit, a rhombic dodecahedron unit or a truncated cube unit; and the vertebral tip adopts a solid structure design. Through extraction of personalized features of the solid model and forward design with light weight asguidance, light-weight design is achieved while personalized customization is achieved, the weight of the hip joint femoral stem prosthesis can be reduced on the premise that the mechanical property is met, maximization of the material utilization rate is achieved, and meanwhile, a large amount of space is provided for bone regeneration and bone ingrowth, and the stability is improved.

The present invention relates to a simple, economical, and efficient cyclic process for producing rhombic dodecahedron shaped glycine enriched, free flowing common salt from brine, said process comprising steps of adding glycine of concentration ranging between 10 to 25% to the saturated bnne, evaporating the saturated brine containing glycine to obtain crystals having high content of glycine, with mother liquor, washing the crystals with saturated brine to obtain rhombic dodecahedron shaped glycine enriched common salt having glycine content ranging between 0.5 to 1.0% and a washed brine, combining the mother liquor and the washed brine to obtain resulting brine, subjecting the resultant brine to solar evaporation, and repeating the steps of (iii) to (v) to obtain rhombic dodecahedron shaped glycine enriched common salt from brine with glycine concentration ranging between 0.5 to 1.0%.

The invention discloses ferroferric oxide rhombic dodecahedron particles and a preparation method thereof. The preparation method comprises the following steps: adding a pyrrolidone stabilizing agent and an iron source to an organic solvent, uniformly stirring, then adding a hydrazine hydrate-containing N,N-dimethyl formamide (DMF) solution, and stirring so as to obtain a precursor solution; carrying out heat preservation on the precursor solution at the temperature of 140-240 DEG C for growing magnetic ferroferric oxide rhombic dodecahedron particles; and carrying out aftertreatment on the solution so as to obtain the magnetic ferroferric oxide rhombic dodecahedron particles. The preparation method has the advantages that the ferroferric oxide rhombic dodecahedron particles which are difficult to synthesize at present and have exposed surfaces with high surface energy are prepared by using a solvothermal method, the preparation process is simple to operate, the inert gas shielding is not needed, the preparation method is good in repeatability and easy to control, and the ferroferric oxide particles are regular and intact in shape and uniform in size distribution, have smooth particle surfaces, also have superstrong magnetism, very good superparamagnetism and enormous potential application in terms of catalytic activity improvement and magnetism recycling.

A two piece golf ball has a core compression in the range of 77 PGA to 87 PGA, a core diameter in the range of about 1.535 inches to 1.545 inches, a cover hardness in the range of 53 to 59 Shore D, and a dimple pattern based on the geometry of a rhombicosadodecahedron. An uninterrupted equatorial great circle path, corresponding to a mold parting line, is provided in the design for forming a cover of the golf ball in two parts. A ball having such characteristics exhibits superior distance performance without compromising shot-making feel.

The invention relates to a laser illumination lamp as a novelty toy using a laser beam pattern that is contained in a polygon sphere such as a truncated rhombic dodecahedron to enable positioning the projection. The above system provides a unique utility shape for a small visual entertainment system toy that operates on batteries as well as AC adapter output for a night light.