159 results about "Dodecahedron" patented technology

Methods, devices and systems for teaching, learning and understanding sacred geometry concepts through magnetic modular toys comprising a plurality of triangular modular members assembled to form multidimensional hedrons and where in each triangular member includes a magnet such that adjacent members have opposite magnetic polarity facing each triangular member. Platonic solid shapes with interior magnets to hold forms together for construction of larger Platonic solids, geometry learning, and puzzle solving skills. Multidimensional hedrons include simple and small as ell as stellated tetrahedrons, octahedrons, icosahedrons and dodecahedrons.

The invention discloses a six-redundancy-type optical fiber strapdown inertial navigation system (SINS). The system is composed of a structural component part, an inertial device part and a peripheral circuit part, wherein the inertial device part is installed on a regular dodecahedron IMU (inertial measurement unit) support of the structural component part, and the peripheral circuit part is distributed on the system body brink of the structural component part. In the invention, the regular dodecahedron is designed to be of a hollow structure, so that high stiffness and light weight of a system IMU table body are realized; redundant configuration is adopted, so that the accuracy and reliability of the inertial navigation system are improved; the separation of the optical path and circuit of an optical fiber gyroscope is basically realized in structure for a system optical fiber gyroscope, so that varying degrees of influences of temperature and temperature gradient change brought by circuit heating on the optical path are avoided; the system has stable performance and good adaptive capacity to environment, can bear a variety of environment test requirements similar to that born by the inertial navigation system, and has good real-time performance.

An acoustic transducer has an upper cylindrical portion and a lower hemispherical portion on which a plurality of transducer elements are arranged. The transducer elements on the cylindrical portion are arranged in such a way that six transducer elements adjacent to any one of the transducer elements are located at vertices of a regular hexagon and regular hexagons adjoining in a horizontal direction have sides which are oriented parallel to an axial direction (vertical direction) of the cylindrical portion. The transducer elements on the hemispherical portion are arranged at vertices of spherical triangles constituting each of spherical pentagons obtained by projecting regular pentagons together forming one half of a regular dodecahedron onto a hemispherical surface of the hemispherical portion in which the half of the regular dodecahedron is inscribed, as well as at equal division points taken on individual sides of each of the spherical triangles and at the centers of gravity of small spherical triangles formed at intersections of parallel arcs joining the equal division points of each of the spherical triangles.

A designing method according to the present invention includes the steps of:

(1) dividing a surface of a phantom sphere of a golf ball 2 into a plurality of units U by division lines 14 obtained by projecting edge lines of a regular polyhedron inscribed in the phantom sphere, on the surface of the phantom sphere;

(2) obtaining a base pattern by randomly arranging a plurality of dimples 8 in one unit U such that the dimples 8 do not overlap each other; and

(3) developing the base pattern over other units U such that patterns of two adjacent units U are not mirror-symmetrical to each other. The regular polyhedron is preferably a regular dodecahedron or a regular icosahedrons.

A structural system comprising the symmetrical interpenetration of an icosahedron and dodecahedron, further articulated to form a rhombic triacontahedron with each rhombus subdivided by two diagonals at its midpoint. The vertices of the original icosahedron and dodecahedron, and the midpoints of the rhombi, are projected such that a single circumscribed sphere would touch or nearly touch all three sets of resulting vertices. This geometry may used to create a hemispheric geodesic dome. Alternatively, this dome may be subdivided along the hemisphere's great circle segments into two half domes or four quarter domes. Rectangular structural elements may be inserted between the half or quarter domes to increase dome area without increasing dome height and to provide other advantages. The basic triangular components of the disclosed structure may be cut with minimal waste from conventional rectangular construction material such as Structural Insulated Panels. These basic triangular components may be connected with a living hinge.

The invention discloses a hollow-out unit body suitable for the metal 3D printing technology. The hollow-out unit body comprises a main structure and an extension structure. The main structure comprises a dodecahedron structure formed by main rib strips serving as the edges. The extension structure comprises extension rib strips extending outwards from the directions of the body diagonals of a dodecahedron. The included angle between each main rib strip and the projection plane is theta, and theta is larger than or equal to 30 degrees but smaller than or equal to 90 degrees. The invention further discloses a metal part comprising the hollow-out unit body. The hollow-out unit body is of a self-supporting structure and suitable for metal 3D printing forming process conditions. Weight reduction of the unit body structure exceeds 90% maximally. A hollow-out weight reduction structure formed by the unit bodies through size changing, direction changing, density changing and other array modes is good in isotropy and high in weight reduction ratio, and the reliability of the part is improved.

The invention discloses a jellyfish magnetic control miniature soft robot. The jellyfish magnetic control miniature soft robot comprises a head and five movable arms which are arranged on the same plane, and the five movable arms are uniformly distributed in the circumferential direction of the head and are arranged in a radial manner; the movable arm comprises an upper arm, a front arm and a hand; the head, the upper arm, the front arm and the hand are sequentially connected through elastic ribs; the head part, the upper arm, the front arm and the hand are rigid parts with different magneticfield directions, so that the five movable arms can move in multiple degrees of freedom under the action of an external magnetic field, and the five movable arms can be bent and locked into a class dodecahedron under the action of the external magnetic field. The jellyfish magnetic control miniature soft robot is simple in structure and manufacturing process, easy to control, cable of achieving six movement modes including clamping objects, crawling movement, rolling movement and horizontal dragging movement, spiral swimming motion and tensioning type swimming motion mode under the driving ofa conversion magnetic field, and has extremely high biological form simulation characteristics and repeated use characteristics.

The invention discloses a preparation method of a hollow carbon material which has dodecahedron morphology and is doped with hollow cobalt phosphide nanoparticles in situ and an application of the hollow carbon material in catalytic electrolysis of water for hydrogen production, and belongs to the technical field of catalytic electrolysis of water for hydrogen production. The method comprises specific steps as follows: (1) preparation of a metal organic framework material ZIF-67 containing cobalt ions and having dodecahedral morphology; (2) the cobalt-containing metal organic framework material ZIF-67 and a dopamine monomer are subjected to reaction, and a cobalt coordination doped hollow polymer nano-material is generated; (3) a cobalt oxide/carbon composite hollow nano-material is prepared; (4) a hollow cobalt phosphide/carbon composite hollow nanomaterial is prepared. The size of the material can be adjusted according to size of ZIF-67; in performance tests of water for hydrogen production in catalytic electrolysis, the electrode material used as a cathode shows very good electrocatalytic activity and stability. Therefore, the material has very good application prospect as the electrode material for catalyzing electrolysis of water for hydrogen production.

The invention disclose a cobaltous oxide/carbon composite hollow nanostructure material of dodecahedron structure and application of the cobaltous oxide/carbon composite hollow nanostructure material in negative electrodes of lithium batteries, and belongs to the technical field of preparation of negative electrode materials for lithium batteries. The method comprises the following specific steps: (1) preparing and purifying an organic frame compound ZIF-67 containing cobalt metal; (2) reacting a dopamine monomer with the organic frame compound ZIF-67 containing cobalt metal to generate a cobalt ion coordinated hollow polymer nanostructure; and (3) under the condition of nitrogen production, carbonizing the hollow polymer nanostructure at the temperature of 500 to 600 DEG C to obtain the hollow nanostructure material. The dimensions of the hollow nanostructure material can be adjusted according to the dimensions of the template metal organic frame compound ZIF-67 nanostructure; in the performance testing process of lithium ion batteries, the hollow nanostructure material, as a negative electrode active material, has preferable cycle performance, rate capacity and stability. Therefore, the cobaltous oxide/carbon composite hollow nanostructure material, as the negative electrode active material, can be of preferable application values and prospects in the field of lithium ion batteries.

The invention provides a device based on a regular dodecahedron base and six common earth pressure cells. An earth pressure cell groove is formed in the six faces, non-parallel to each other, of the regular dodecahedron base respectively; the six common earth pressure cells are fixed on the six grooves respectively; the gap between each groove and each common earth pressure cell is filled with an expansion water stop ring; a wire hole for guiding a data wire of the common earth pressure cell to the center of the regular dodecahedron is formed in each groove; a wire gathering hole is formed in any face of the regular dodecahedron base without a groove; and the data wire is connected with an earth pressure cell testing and reading element. The invention also provides an operation method of the regular dodecahedron-based three-dimensional stress state testing device. The beneficial effects are as follows: the stress state of a point in an earth body is accurately and conveniently obtained, the error of the traditional way of pasting a strain rosette to reflect stress is improved, and the average test precision is 0.81rho. Through the precision improvement, the conventional stress state of the earth body can be reflected more accurately, and the safety stock of a project is improved.

The invention discloses a single-freedom-degree moving dodecahedron foldable symmetric coupling mechanism. A regular pentagon face A1A2A3A4A5 and a regular pentagon face B1B2B3B4B5 are taken as a geometric element and each replaced with a regular pentagon component, the other ten vertexes are C, C', D, D', E, E', F, F', G and G' and are replaced with ten isosceles triangle components, and the other twenty edges A1C, A2D, A3E, A4F, A5G, B1C', B2D', B3E', B4F' and B5G' are replaced with twenty connecting rods which each comprise two rotary pairs. Five rotary pair axes on each pentagon component are located in a pentagon plane. The five rotary pair axes on each regular pentagon component are marked as a1, a2, a3, a4 and a5 in the clockwise direction, the middle point of the axis of a1, the middle point of the axis of a3 and the middle point of the axis of a4 of each regular pentagon component are connected to form an isosceles triangle component, and three rotary pairs on each isosceles triangle component are located in a triangle plane. Each connecting rod is a connecting rod piece which comprises the two connecting rotary pairs and is of the same kind, and the axes of the two rotary pairs of each connecting rod are parallel to each other.

The invention discloses a sound insulation measurement system and a measurement method based on a three-dimensional sound intensity array. According to the sound insulation measurement system, a measurement platform based on Labview and a regular tetrahedron sound intensity probe are arranged inside a sound receiving chamber; a PC (Personal Computer), a sound card, a power amplifier and a dodecahedron loudspeaker are arranged inside a sound source chamber; the PC, the sound card, the power amplifier and the dodecahedron loudspeaker are connected in sequence; the dodecahedron loudspeaker is positioned in the central position of the sound source chamber; a test part to be measured and a reflection plate are arranged between the sound receiving chamber and the sound source chamber; the test part to be measured is arranged in the center of a wall surface; the reflection plate is positioned at the periphery of the test part to be measured; the sound receiving chamber is completely isolated from the sound source chamber through the test part to be measured and the reflection plate; the PC, the sound card, the power amplifier and the dodecahedron loudspeaker form an original signal output module. Sound intensity vectors tested by using the sound insulation measurement system comprise information such as amplitude and phase, and not only is an air sound insulation index of a building part tested, but also the direction of a noise source can be predicted by calculating directions.

The invention relates to Ag@Ag2O microcrystals of a photocatalytic material with specific patterns and high surface activity and a preparation method thereof. The Ag@Ag2O microcrystals of the photocatalytic material are made of a compound photocatalytic material with the corresponding patterns formed by depositing silver nano particles at the surfaces of silver oxide particles with different patterns. The Ag@Ag2O microcrystals of the photocatalytic material with the specific patterns and high surface activity and the preparation method thereof are characterized in that silver oxide is in a cubic crystal system, the particle size is 0.5 to 2.0mum, and the particle size of the silver nano particles deposited at the surfaces is 20 to 30nm; and the silver oxide particles have one of the 5 following patterns: a cubic block, a rhombohedral dodecahedron, an octahedron, a 18-faced body or a 26-faced body. The invention also provides a preparation method of Ag@Ag2O. By exposing the crystal face of Ag2O, which has different surface energy, and loading silver deposited at the surface of the Ag2O, the Ag@Ag2O photocatalytic material disclosed by the invention has high surface activity, the preparation method is simple, the reaction condition is mild, the operation is convenient, and the energy consumption is little.

The invention relates to a spherical regular dodecahedron sound source used for near-field HRTF measurement and a design method thereof. The sound source comprises a spherical metal shell and twelve speaker units which are uniformly distributed on the inner side of the spherical metal shell; every three speaker units are positioned on the same latitude plane of the spherical metal shell; and every four speaker units are connected in series, and three groups of serially connected speaker units are connected in parallel. The sound source can weaken the diffraction effect of the surface edges and planer structure of the sound source on sound waves, reduce the multiple scattering of the sound source and improve the high-frequency non-directional characteristic of the sound source radiated sound waves, and has enough wide frequency response range to meet the requirement of near-field HRTF measurement.

The invention discloses a lithium air battery cathode material and a preparation method thereof, and a lithium air battery. The cathode material is a cobalt sulfide which is a hollow core-shell dodecahedron structure; ZIF-67 and a sulphur source are dissolved in a solvent to form a mixed solution; the mixed solution is subjected to heating, heat preservation, cooling and drying by employing a hydrothermal method to take out a precipitate, namely the lithium air battery cathode material. The hydrothermal method is employed to perform vulcanization of the ZIF-67 to obtain the cathode material, the preparation method is simple, the cathode material has the electrochemical catalytic activity, the lithium air battery prepared by employing the cathode material is excellent, has the coulombic efficiency up to 86.6%, can show better reversibility, and can effectively improve the cycle life of the battery: when the specific discharge capacity is controlled to 500 mAh g<-1>, the lithium air battery can stably cycle for 32 loops until the voltage is stabilized above 2.0V.

A game device and a method of playing a game. The game device includes a chance selection device in the form of a polygonal dice, preferably a twelve-sided dodecahedron dice, to randomly select sequential numbers from one to the number of facets displayed on the dice. A plurality of score sheets are provided as part of a score pad which includes a backing sheet made of cardboard all interconnected by a resilient binding strip. Each score sheet is made of paper with a front side printed with respective areas to record player names, roll scores, and total scores, and a back side printed with game rules. A writing device is provided, preferably a pencil with integral eraser, for recording the player names, the roll scores, and the total scores on the score sheets. The dice may be of a foamed construction being molded from self-skinning urethane in a size sufficient to prevent ingestion by children. Alternatively, the dice may be of a hollowed construction made from a sheet pattern which includes a plurality of flat polygonal members, preferably pentagonal for the dodecahedron dice, having the facets with numbers interconnected at a plurality of fold lines. The sheet pattern is formed into the dodecahedron shape by folding along the fold lines and joining together an outer edge thereof. The dice may include a plurality of display cards removably attachable to each facet with the numbers disposed thereon. The method includes determining the number of turns each player gets per game using the chance selection device, deciding whether high or low score wins the game, conducting roll-offs using the chance selection device to determine player starting positions, taking turns selecting numbers using the chance selection device, recording the scores on the scoring sheet, and upon each player having the determined number of turns, adding the scores for each player to establish the winning player.

The invention discloses a preparation method and application of a petaloid metal organic framework material. Specifically, a hydrothermal method is adopted to control synthesis raw materials and a hydrothermal time so that the petaloid-morphology ZIF-67 material is synthesizd, and the synthesized petaloid-morphology ZIF-67 material is adopted as a positive electrode catalyst material for an oxygenevolution reaction so as to study application of the synthesized material in the oxygen evolution reaction. The ZIF-67 material is obtained through self-assembly of an organic ligand 2-methylimidazole, cobalt nitrate and a Fe2Co metal cluster salt in a methanol solvent system, and meanwhile on the basis of the synthesis, the reaction time is changed so as to regulate the morphology and convert the dodecahedron morphology into the petaloid morphology; and when the synthesized material is assembled into a three-electrode system for an oxygen evolution performance test, it is found through dataanalysis that the petaloid ZIF-67 material has better oxygen evolution performance than the ZIF-67 material with a dodecahedron morphology.

The invention discloses a coliphage B_EcoM_C1 with the preservation number of CCTCC NO:M 2017190. The coliphage B_EcoM_C1 is a double-stranded DNA, belongs to a myovirus family, having a regular dodecahedron-shaped head and a telescopic tail, and can form a transparent and bright plaque on a solid medium, no aureoles exist surrounding the plaque, the plaque has clear and regular edge, and the diameter is 0.5-1 mm. The coliphage B_EcoM_C1 has a good eliminating and killing effect on enterohemorrhagic Escherichia coli in the space environment, and especially mcr-1 positive enterohemorrhagic Escherichia coli, and can be applied to the preparation of medicines for controlling the enterohemorrhagic Escherichia coli infection in order to realize a broad-spectrum sterilization effect.

The invention provides Cu nanocrystallines and a topological and chemical reduction method for preparing a Cu nanocrystalline catalyst with different morphologies. According to the method, Cu2O nanocrystallines with different morphologies are adopted as precursors and are subjected to topological reduction under the reducing atmosphere of CO or H2 or CO+H2O or the like to obtain the corresponding Cu nanocrystallines. The specific preparation method includes the first step of synthesizing the Cu2O nanocrystallines with the three different morphologies of cubes, octahedrons and dodecahedrons, the second step of conducting protective agent removal treatment on the corresponding octahedrons with protective agents and the corresponding dodecahedrons with protective agents, and the third step of conducting constant-temperature reduction at a fixed temperature under the reducing atmosphere containing 1%-10% of CO/Ar or 1%-10% of H2/Ar or 1%-10% of CO plus 5%-15% of H2O/Ar or the like for one to two hours, cooling down naturally to the indoor temperature, and then obtaining the Cu nanocrystallines which keep the corresponding morphologies. The obtained Cu nanocrystalline catalyst is applied to a water gas shift reaction, an obvious catalytic activity difference is shown, and the Cu nanocrystalline catalyst has good application space.

The invention provides a preparation method of an efficient composite wave-absorbing material ZIF-67atCNTs and belongs to the technical field of composite materials. At first, ZIF-67 is synthesized, after the ZIF-67 is fully dried, a certain amount of melamine is added, and by means of grinding and uniform mixing, mixed powder is obtained. Then high-temperature carbonization treatment is carried out, Co in the ZIF-67 is reduced at a high temperature to further catalyze a carbon nao-tube growing on the surface of a dodecahedron skeleton, and a hedgehog-shaped cobalt carbon composite wave-absorbing material (ZIF-67atCNTs) is prepared. The ZIF-67atCNTs prepared through the two-step method has excellent wave-absorbing performance, and effectively absorbs an overall X wave band covered by the band width.

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 carbon-cobalt-molybdenum double-metal phosphide composite material and a preparation method thereof. The composite material is formed by a carbon skeleton with a dodecahedronstructure and MoP, CoP and CoMoP2 nano particles uniformly embedded in the carbon skeleton. The carbon skeleton with the dodecahedron structure is effectively kept, and the nano double-metal phosphide particles are uniformly embedded in a carbon substrate, so aggregation and falling of the nano particles can be prevented, stability of a catalyst is reinforced, high conductivity of the carbon substrate and the synergistic effect between the nano double-metal phosphide particles can also be developed, and catalytic activity of the phosphide is further reinforced. The carbon skeleton is capableof effectively improving the electrical conductivity of a whole catalyst material, thereby further improving catalytic performance thereof. The synergistic effect between various phases of the double-metal phosphide has a very important function to improve electrochemical catalytic performance. The nano double-metal phosphides are uniformly embedded in the carbon substrate, the aggregation and falling of the nano particles can be prevented, the stability of the catalyst is reinforced, and the composite material also has excellent electrochemical hydrogen evolution performance in an alkaline environment.

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 belongs to an Nd<3+> sensitized radiation-resistant laser crystal which is characterized in that the chemical expression of the crystal is Nd<3+>,Er<3+>: Gd3Sc2Ga3O12 (abbreviated as Nd, Er:GSGG, wherein, the doping concentration of the Er<3+> is higher than 30at%), both the Nd<3+> and the Er<3+> are Gd<3+> which replaces the central position of a dodecahedron in the crystal, and the Nd<3+> is taken as sensitized ions which transfer the absorbed energy to the Er<3+> ions in the crystal to enhance the laser pumping efficiency of the Nd,Er:GSGG near 2.7-2.8mum. The laser of the wave band has important application to the fields such as biomedical treatment, optical parametric oscillation, electro-optical countermeasures and the like. As the Nd, Er:GSGG laser crystal has the capacity of resisting radiation of high-intensity gamma rays and other rays, the Nd<3+> sensitized radiation-resistant laser crystal can also meet the requirements of radiation environment and space environment application besides meeting the requirements of ground application.