39 results about "Decahedron" patented technology

Apparatus and methods for encoding panoramic content, such as by a wide field of view and large image size. In one implementation, a panoramic image may be mapped to a cube, equirectangular or any other projection e.g., icosahedron or octahedron. Projection may be selected adaptively based on evaluation of the panoramic content. Content evaluation may include obtaining rate distortion cost metric for a given projection configuration including projection type, projection arrangement, and projection orientation. Projection configuration with the lowest cost may be selected as target projection for encoding content. As content composition changes (e.g., object motion, texture presence and / or location) projection may be adaptively selected to match changes in the content. Adaptive content selection methodology may provide for a lower encoded bitrate for a given encoded quality and / or higher quality for a given bitrate.

Apparatus and methods for characterizing panoramic content, such as by a wide field of view and large image size. In one implementation, a panoramic image may be mapped to a cube or any other projection e.g icosahedron or octahedron. The disclosure exploits content continuity between facets, such as in the case of encoding / decoding cube-projected images. One facet may be encoded / decoded independently from other facets to obtain a seed facet. One or more transformed versions of the seed facet may be obtained; e.g., one corresponding to a 90° counterclockwise rotation, another to a 90° clockwise rotation, and one to an 180° rotation. Transformed versions may be used to form an augmented image. The remaining facets of the cube may be encoded using transformed versions within the augmented image. Continuity between transformed facets in the top row of the augmented image and facets in the middle row of the augmented image may be utilized for motion or intra prediction, and to obtain greater encoding performance compared to encoding facets independently.

Four predefined vertices define an icosahedron used for constructing a geodesic dome. Each section of the icosahedron, including the top, center, and bottom, is sequentially processed to construct a plurality of vertices and a plurality of indices of triangles on the surface of the geodesic dome. One of the inputs defines the order of the geodesic dome, which determines the number of vertices. A plurality of transformation matrices are employed to rotate a three-dimensional vector about a selected axis through a predefined angle to generate the vertices. The indices for the triangles are constructed as either triangle strips or triangle lists, for each of the three sections of the icosahedron. Vertices are stored in a vertex buffer and indices in an index buffer. The vertices are selected to form a plurality of edges disposed at an equal distance from the center of the icosahedron.

The invention provides a crystal face proportion-controllable bismuth vanadate photocatalyst, and a synthesis method thereof. The photocatalyst is sued for high-efficiency photocatalysis of water oxidation. The growth process of the bismuth vanadate photocatalyst is controlled to accurately regulate the transition of the phase structure of the photocatalyst from a tetragonal phase to a monoclinic phase and the change of the monocrystalline morphology from a micro-spherical shape to a regular decahedral morphology, so the (010) and (011) proportions of the decahedron are effectively controlled. The aquatic product oxygen decomposition activity of the optimized decahedral bismuth vanadate photocatalyst in the presence of a Fe<3+> soluble electron acceptor reaches 60.0 L / kg / h or above, and the oxygen production apparent quantum efficiency at 460 nm reaches 60% or above. The photocatalyst still has good activity under outdoor sunlight, can be recycled multiple times, and has good stability. The method has a simple preparation process, and the prepared photocatalyst has the advantages of high activity, high stability, non-toxicity, greenness, realization of high-efficiency catalysis of the water oxygen under the sunlight, and hopefulness for being coupled with a hydrogen production catalyst in large-scale solar photocatalytic decomposition of water for producing hydrogen.

The invention provides a kind of single icosahedron quasicrystal material with hydrogen storing function. Its component is Ti100-x-y-zZrxNiyCuz, thereinto, 10 < x < 45, 5 < y < 20, 1 < z < 10. the forming ability of the alloy quasicrystal is strong, and the formed quasicrystal material is single icosahedron structure. It is thermodynamics is stable, and has good hydrogen storing function. It can be applied in gaseous state hydrogen storing material and battery cathode material; meantime, it provides a kind of producing method of the material: according to the count of the component formula of the quasicrystal material, choose powders of Ti, Zr, Ni, and Cu of 100 holes per cm2 chemical purity, encase them in the ball milling pot of the high energy ball mill, the ball material rate is 20 : 1, ball mill for 100 - 200 hours under the protection of argon, seal the ball milled alloy powders in the quartz tube, have heat processing at 1 í‡ 10-3 Pa, the heat processing temperature is 480 - 650 Deg. C, the time is 0.5 - 6 hours. Its craft is simple, the operational ability is strong, and it is easy to be industrialized.

The invention provides a polycarboxylic cage type phenylsilsesquioxane-co and a relative synthesis method, which formula is (SiO<1.5>)<n>(C<6>H<5>)<x>{C<6>H(COOH)<q>}<y>, wherein when n is 8, 10 and 12, respectively corresponding to hexahedron, octahedron and decahedron cage type structures, x is integer from 0 to n-1, y is integer from 1 to n, x+y=n, p is integer from 2 to 4, and q is integer from 1 to 3. The preparation method comprises reacting cage type phenylsilsesquioxane-co and liquid bromine at normal temperature to obtain polybrominated cage type phenylsilsesquioxane-co, to be reacted with organic metallizing reagent, dry ice or carbon dioxide, to prepare the polycarboxylic cage type phenylsilsesquioxane-co. The invention has the advantages of wide material resource, simple synthesis and high yield, with wide application in polymer modification, organic and inorganic nanometer hybrid material, low-dielectric material or medical material.

An ultrafine Al particle consists of an Al multiply twinned particle. The Al multiply twinned particle has a decahedron structure surrounded by {111} planes. The Al multiply twinned decahedral particle has a diameter of 10 to 30 nm. Such an ultrafine Al particle consisting of the Al multiply twinned decahedral particle is obtained as follows. A metastable Al oxide particle is placed on an amorphous carbon substrate having the reduction effect. Then the electron beam is irradiated to the metastable Al oxide particle placed on the amorphous carbon substrate in the vacuum atmosphere. From the metastable Al oxide particle, Al atoms or Al clusters are emitted and adsorbed to the substrate. By adjusting the electron beam intensity so that the ultrafine Al particle in the above procedure has a diameter from 10 to 30 nm, the Al multiply twinned particle having a decahedron is obtained.

The invention relates to a method for preparing gold crystals from nanometer to micrometer by adopting surface active agent molecule C18N3 as reducing agent and protecting agent. The surface active agent molecule C18N3 is not only adopted as the reducing agent to reduce chloroauric acid and obtain crystal nucleus, but also used as a sort of good protecting agent to facilitate the shape control and the growth of the metal crystals. Compared with the conventional method, the surface active agent molecule C18N3 is adopted in hydrothermal method applied in the invention to prepare the metal crystals, the prepared metal crystals have better shape controllability. By simply adjusting the molar ratio between the surface active agent molecule C18N3 and the chloroauric acid as well as the concentration of chloride in the solution, the metal crystals with different shapes can be prepared, including sphere, decahedron, plane triangle, plane pentagon and plane hexagon and two-dimension sheet shape.

The invention relates to a preparation method of a Cu-BTC-derived decahedron Cu<1.8>Se / C composite material. The method comprises preparation of metal-organic framework Cu-BTC and synthesis of Cu<1.8>Se / C. The prepared Cu-BTC-derived decahedron Cu<1.8>Se / C composite material maintains a regular decahedron structure, has the relatively complete morphology, is not easy to agglomerate, has high product purity, has a high specific surface area and porosity, shows excellent lithium storage property and good electrical conductivity and has very good cycle stability and higher discharge specific capacity, under the current density of 100 mA g<-1>, the first discharge specific capacity is 1078.7 mAh g<-1>, after 100 charge-discharge cycles, the discharge specific capacity is 942.6 mAh g<-1>, coulomb efficiency is high, and the prepared material can be utilized as a negative electrode material in a lithium ion battery.

The invention belongs to the technical field of laser performance testing, and particularly relates to an online testing device for performance of a laser gyroscope reflector. The online testing device is obtained through performing mechanical processing, optical processing and chemical polishing on microcrystalline glass material with a cube structure. The body is a straight prism chamber with a decahedron structure. The bottom surface of the straight prism is an octagon of which each inner corner is 135 DEG, and the middle part is provided with a central through hole of which the diameter is 50mm. A spherical surface output mirror, an anode 1, a chamber translation mirror, a cathode, a planar output mirror, an anode 2, a spherical surface total reflection mirror and a blank surface are successively arranged on six side surfaces of the straight prism. Two sides of the planar output mirror and two sides of the spherical surface output mirror are provided with four light windows. After a power supply is switched on, the online testing device for the performance of the laser gyroscope reflector starts to operate. An area which extends from the anode 1 to the anode 2 through the cathode in the straight prism chamber is a discharging area. A He-Ne laser output with a wavelength of 632.8nm is generated on the spherical surface output mirror and the planar output mirror, thereby observing performance change condition of the laser gyroscope reflector in real time.

The invention discloses a gold nano bipyramid with a five-fold twin structure and a preparation method thereof. A gold nano decahedron is prepared in ethylene glycol by adopting a polyol reduction method; hydroquinone, chloroauric acid and the gold nano decahedron are mixed together so that the concentration of hydroquinone in the mixed solution is 0.001-0.004 mol / L, the concentration of chloroauric acid is 0.0005-0.002 mol / L, and the concentration of the gold nano decahedron is 0.0001-0.005 mol / L; and reacting is then carried out at 30-70 DEG C for 10 hours, and then solid-liquid separation is carried out to obtain the gold nano bipyramid with the five-fold twin structure. The gold nano bipyramid has good near-infrared light absorption performance and high catalytic activity of the twin structure, and has simple preparation process, low cost and environmental friendliness; and the gold nano bipyramid has important application value and wide application prospect in the fields of infrared imaging, photothermal therapy, catalysis and the like.

The invention provides a soil mass total stress component sensing ball and a using method thereof. The soil mass total stress component sensing ball comprises a regular icosahedron framework, a spherical shell, and a weight adjusting mechanism for adjusting the overall weight of a sensing ball. Sixteen distributed optical fibers are arranged on the face, away from a conical force transmission cap,of each first steel sheet and used for testing stress of the conical force transmission cap, and the two distributed optical fibers are used for conducting temperature correction on deformation of the distributed optical fibers. According to the soil mass total stress component sensing ball and the using method thereof, six effective stress components in the soil mass are obtained through wavelength change values of light in the sixteen distributed optical fibers and temperature correction based on a conversion formula, more data are collected, and the measurement precision is high. The placement direction does not need to be determined in advance and the soil mass total stress component sensing ball and the using method thereof are also suitable for soil bodies with complex stress statechanges.

A vacuum lighter than air vehicle (VLTAV) includes a rigid frame of rods connected together to form a hexakis icosahedron. A membrane skin covers the rigid frame and defines therewith a vessel configured to hold an internal vacuum that allows the vessel to float in the air. The plurality of rods and membrane skin have weights and dimensions that result in a neutral and / or positive buoyancy for the vessel while preventing geometric instability.

The invention discloses a sub-eye optimal arrangement method of a compound eye system based on three-dimensional detection. A regular polyhedron is subjected to subdivision with the frequency being v,subdivided vertexes are used as sub-eye centers for distribution structure design, and the method has the main advantages that subdivision with the frequency being v subdivides each face of the regular icosahedron for v times, and the sub-eye arrangement uniformity is greatly improved compared with an original hexagonal structure; the compound eyeball shell designed and processed by using the regular polyhedron subdivision method can realize more dense arrangement. Manufacturing is convenient, and subsequent processing such as image recognition, splicing and multi-channel fusion is also facilitated. The defect that regular hexagons are seriously deformed due to the fact that hexagons cannot be arranged on spherical surfaces in a sealed connection mode in a traditional arrangement method is overcome.

The invention discloses a method for calculating global terrain correction based on a multi-resolution polyhedron under a hexagonal grid index. The method comprises the following steps: constructing a spherical hexagonal grid system H3 of 7-hole subdivision based on an icosahedron; constructing a terrain partitioning strategy under the H3 based on the H3 and each grid parameter; determining a polyhedral model of a multi-resolution terrain by using a corresponding relation between a hexagonal grid and a triangular surface, considering seawater mass density loss, and determining the terrain correction influence on a to-be-calculated point by using a polyhedral integration method; and by utilizing the constructed polyhedral model and the corresponding seawater mass density thereof, determining a gravitational force value corresponding to each polyhedral model at the point to be calculated by using a polyhedral integration method, and taking the sum of a plurality of groups of gravitational force values as a final terrain correction value at the point to be calculated. According to the method, the long wavelength error of terrain correction is smaller, and meanwhile high-precision calculation of terrain correction of a local area is achieved through a multi-resolution terrain model.

The invention discloses a preparation method of a (040) preferred orientation two-dimensional sheet decahedron-shaped monoclinic phase bismuth vanadate. According to the method, after vanadium sourcesolution which is obtained by dissolving ethylenediaminetetraacetic acid into sodium vanadate solution is uniformly mixed with the aqueous glycerol solution of bismuth nitrate, the pH value of the reaction system is regulated to 4.5 to 6.5, the obtained precursor solution is then loaded into a hydrothermal reactor to undergo hydrothermal reaction under 150 DEG C to 220 DEG C for 10 to 48 hours, and after cooling, filtration, washing, drying and grinding, the (040) preferred orientation two-dimensional sheet decahedron-shaped monoclinic phase bismuth vanadate is obtained. The sample prepared bythe preparation method is monoclinic phase bismuth vanadate without structure-directing agent remaining, shows a (040) preferred orientation special micromorphology with a two-dimensional sheet decahedron shape, and can help increase photocatalytic activity. The preparation method of a (040) preferred orientation two-dimensional sheet decahedron-shaped monoclinic phase bismuth vanadate disclosedby the invention has the advantages of mild reaction conditions, good repeatability, simple process and low cost, the properties of the obtained catalyst are excellent, and the preparation method is suitable for industrial production.

The Luneberg lens includes a plurality of centrally arranged spherically symmetric layers, each layer formed of a plurality of triangular regions. The plurality of triangular regions of each layer form a short-range linear polyhedron, such as a regular icosahedron. Each triangular region includes one or more apertures, and each aperture may be triangular.

Titanium oxide grains of large specific area and high crystallinity with reduced internal defects, whose high photocatalytic activity as a photocatalyst is promising; and titanium oxide grains which even when heated at high temperature, exhibits low tendency of transformation to rutile crystal structure and exhibits low rate of sintering. As titanium oxide grains for composing a photocatalyst, use is made of those of the shape of a boxy polyhedron. The polyhedron constituting the titanium oxide grains is composed of one or more titanium oxide single-crystal polyhedrons. The crystallinity can be enhanced by causing the flatness ratio of single-crystal polyhedrons to fall within the range of 0.33 to 3.0. It is preferred that the polyhedron be a hexa to decahedron. The rutile transformation ratio R (700 to 24) is to be 7.5% or less while the rutile transformation ratio R (500 to 24) is to be 2.0% or less. Titanium oxide grains of the above configuration are produced through a process comprising feeding titanium tetrachloride vapor and oxygen into a synthetic tube of quartz glass and heating them from the exterior of the synthetic tube by means of an oxyhydrogen flame burner so as to effect thermal oxidation.

The invention discloses a star catalogue partitioning and feature library building method applied to a star sensor, which comprises the following steps of: uniformly partitioning a star catalogue by using an inscribed regular icosahedron method of a celestial sphere to form a partitioned star catalogue; determining a celestial sphere subarea corresponding to a subarea where a part of star points in the star sensor view field are located, retrieving a navigation star in the celestial sphere subarea, and extracting position information of the navigation star; and constructing a navigation feature library by taking the information of the navigation satellites in the star catalogue and the position relationship among the navigation satellites as feature values. The invention further disclosesa star catalogue partitioning and feature library building device applied to the star sensor. The star catalogue partitioning and feature library building method and device applied to the star sensorhave the advantage of uniform partitioning.

The invention belongs to the technical field of computer application, and discloses a global regular icosahedron grid generation method with any resolution and application. The method comprises stepsof Starting from the positions of the initial K points inside, the Lloyd iteration can determine an icosahedron grid associated with the points; Moving each point to the mass center of the hexagonal grid; And repeating the above steps until the displacement of the point meets a specified condition. According to the method, a global regular icosahedron grid generation method is adopted, and the denser the grids are, the higher the requirement for a computer memory is; The sparser the grid is, the lower the requirement for the computer memory is. By use of the Deterministic method, convergence is accelerated, a global icosahedron grid of a 655362 unit is generated only by 2 hours, but the original probability Lloyd method needs 340 hours for serial calculation on a computer with the same configuration, the calculation time is saved by about 338 hours through a global icosahedron grid generation method, and the calculation efficiency is improved by 99.4% relative to the probability Lloydmethod; Calculation efficiency is greatly improved.

Apparatus and methods for characterizing panoramic content, such as by a wide field of view and large image size. In one implementation, a panoramic image may be mapped to a cube or any other projection e.g icosahedron or octahedron. The disclosure exploits content continuity between facets, such as in the case of encoding / decoding cube-projected images. One facet may be encoded / decoded independently from other facets to obtain a seed facet. One or more transformed versions of the seed facet may be obtained; e.g., one corresponding to a 90° counterclockwise rotation, another to a 90° clockwise rotation, and one to an 180° rotation. Transformed versions may be used to form an augmented image. The remaining facets of the cube may be encoded using transformed versions within the augmented image. Continuity between transformed facets in the top row of the augmented image and facets in the middle row of the augmented image may be utilized for motion or intra prediction, and to obtain greater encoding performance compared to encoding facets independently.

The invention discloses a monocular 6D pose estimation method based on a regular icosahedron. According to the method, an ArUco code is combined with a regular icosahedron, then a monocular camera is used for collecting a regular icosahedron image marked by the ArUco code, the spatial three-dimensional coordinate of the central point of the ArUco code is calculated, the sparse point cloud of an inscribed sphere of the ArUco code is obtained, then multiple nonlinear fitting and an iterative nearest point algorithm are used for comparing the virtual regular icosahedron at the coordinate of the camera. And further the spatial displacement and the rotation angle of the current regular icosahedron can be calculated, and the pose of the measured object is calculated indirectly. The method overcomes the high requirements of an existing method for illumination, environment and equipment, the detection is rapid, and the stability is improved; according to the method, a large amount of energy does not need to be put into template acquisition or model training in the early stage, the pose estimation cost is remarkably reduced, the pose estimation precision is ensured, the universality is enhanced, and pose estimation of large-amplitude movement of an object can be carried out.

The IKOS holistic game of this invention comprises a semi-regular geometric solid of 32 faces. 12 faces are regular pentagons interfaced to 20 equilateral triangles. The polyhedron also comprises 60 equal upstand edges each one of which subtends 36 degrees at the centroid of the polyhedron. It also comprises 30 equal vertices at which four edges and four faces meet. The surface elements 1 of the IKOS are of seven distinct colors, with each surface element being of one color only. There are six sets of like colored surface elements with two pentagons and ten up-stands in each set. All the triangular panels are in the seventh, neutral, shade. Also included is a method of designing the 32'dron on a CAD system.

The invention provides a zirconium-based bulk amorphous alloy and a preparation method thereof and belongs to the technical field of amorphous alloys. A proper amount of silver element is used for replacing the iron element in the existing amorphous alloy Zr<60>Cu<25>Al<10>Fe<5>, the replacement of the iron element with the silver element causes the component segregation on an atomic scale in an atomic stacking structure in the amorphous alloy, and a large number of high-density short-range ordered structures (such as an icosahedron short program, a distorted icosahedron short program and thelike) are formed, so that the amorphous forming capability and the mechanical property of the system are obviously improved, the viscosity and the stability of an amorphous melt are obviously increased, and the reheating crystallization behavior of the material is greatly inhibited, namely the room-temperature plastic deformation capability, the amorphous forming capability, the thermal stabilityand the mechanical property of the amorphous alloy can be improved by replacing the Fe element with the Ag element.

The invention discloses a monocular 6D pose estimation method based on a regular icosahedron. This method combines the ArUco code with the icosahedron, and then uses the monocular camera to collect the icosahedron image marked by the ArUco code, calculates the spatial three-dimensional coordinates of the center point of the ArUco code, and obtains the sparse point cloud of its inscribed sphere , and then use multivariate nonlinear fitting and iterative closest point algorithm to compare the virtual icosahedron at the camera coordinates, and then calculate the spatial displacement and rotation angle of the current icosahedron, and indirectly calculate the pose of the measured object . This method overcomes the high requirements of the existing methods on lighting, environment and equipment, detects quickly, and improves stability; it does not need to invest a lot of energy in the early stage for template collection or model training, which significantly reduces the cost of pose estimation and ensures Pose estimation accuracy and enhanced versatility, and can perform pose estimation of large-scale motion of objects.