467 results about "Trigonal crystal system" patented technology

Several inventions are disclosed. A cell architecture using hexagonal shaped cells is disclosed. The architecture is not limited to hexagonal shaped cells. Cells may be defined by clusters of two or more hexagons, by triangles, by parallelograms, and by other polygons enabling a variety of cell shapes to be accommodated. Polydirectional non-orthogonal three layer metal routing is disclosed. The architecture may be combined with the tri-directional routing for a particularly advantageous design. In the tri-directional routing arraingement, electrical conductors for interconnecting terminals of microelectronic cells of an integrated circuit preferrably extend in three directions that are angularly displaced from each other by 60°. The conductors that extend in the three directions are preferrably formed in three different layers. A method of minimizing wire length in a semiconductor device is disclosed. A method of minimizing intermetal capacitance in a semiconductor device is disclosed. A novel device called a "tri-ister" is disclosed. Triangular devices are disclosed, including triangular NAND gates, triangular AND gates, and triangular OR gates. A triangular op amp and triode are disclosed. A triangular sense amplifier is disclosed. A DRAM memory array and an SRAM memory array, based upon triangular or parallelogram shaped cells, are disclosed, including a method of interconnecting such arrays. A programmable variable drive transistor is disclosed. CAD algorithms and methods are disclosed for designing and making semiconductor devices, which are particularly applicable to the disclosed architecture and tri-directional three metal layer routing.

Embodiments automatically generate an accurate network of watertight NURBS patches from polygonal models of objects while automatically detecting and preserving character lines thereon. These embodiments generate from an initial triangulation of the surface, a hierarchy of progressively coarser triangulations of the surface by performing a sequence of edge contractions using a greedy algorithm that selects edge contractions by their numerical properties. Operations are also performed to connect the triangulations in the hierarchy using homeomorphisms that preserve the topology of the initial triangulation in the coarsest triangulation. A desired quadrangulation of the surface can then be generated by homeomorphically mapping edges of a coarsest triangulation in the hierarchy back to the initial triangulation. This quadrangulation is topologically consistent with the initial triangulation and is defined by a plurality of quadrangular patches. These quadrangular patches are linked together by a (U, V) mesh that is guaranteed to be continuous at patch boundaries. A grid is then preferably fit to each of the quadrangles in the resulting quadrangulation by decomposing each of the quadrangles into k2 smaller quadrangles. A watertight NURBS model may be generated from the resulting quadrangulation.

Apparatus for obtaining 3-Dimensional data of a geometric body for matching, and particularly for use in facial matching, comprises a three dimensional scanner for obtaining three-dimensional topographical data of the body, a triangulator for receiving or forming said data into a triangulated manifold, a geodesic converter, for converting the triangulated manifold into a series of geodesic distances between pairs of points of the manifold, and a multi-dimensional scaler, for forming a low dimensional Euclidean representation of the series of geodesic distances, to give a bending invariant representation of the geometric body. In one variant, matching is carried out by taking the principle eigenvalues from the representation and plotting as co-ordinates in a feature space. Tilted or different expression versions of the same face tend to form clusters in the feature space allowing for matching. The apparatus preferably uses the fast marching method for the triangulated domain to obtain the geodesic distances.

Described is a set of at least two annuloplasty devices having a particular size that corresponds to an inter-trigonal or inter-commissural distance of a heart valve annulus, wherein the at least two annuloplasty devices have different anterior-posterior ratios. Also, described is a kit for annuloplasty repair of a heart valve annulus including a plurality of annuloplasty devices each comprising one of a plurality of different sizes, wherein the different sizes each correspond to a different inter-trigonal or inter-commissural distance of a heart valve annulus, and for each of the plurality of different sizes there are at least two devices each having the same size but having different anterior-posterior ratios. Additionally, a method of choosing an annuloplasty device for implantation in a valve annulus is described.

The invention provides a partition machining method of a triangular mesh model, and belongs to the technical field of CAM. The partition machining method of the triangular mesh model is characterized in that the partition machining method includes the steps that neighborhood points within an R radius range are selected so as to calculate differential geometry information of a triangular patch model accurately; the triangular patch model is segmented into sub-regions with different characteristics with characteristic statements of sub-regions to be machined as growth principles, optimization merging is conducted on small-area regions and wrongly judged regions so as to eliminate over-segmentation phenomena, and boundary smoothing is conducted on the sub-regions so as to reduce saw-toothed boundaries; different track strategies are adopted in different types of the sub-regions to be machined, when a constant scallop height track is generated, the circular cutting initial track generation method is adopted in the convex sub-regions and the concave sub-regions, the linear cutting initial track generation method is adopted in the saddle-shaped sub-regions, machining is conducted on tracks at the positions of sub-region boundaries when bias extension is conducted on cutter track projection, and reasonable and complete sub-region machining tracks are obtained. According to the partition machining method, numerical control machining cutter tracks giving consideration to the machining efficiency and the machining quality are effectively generated from the complicated triangular patch model.

The invention discloses a reconstruction method of a triangular mesh model, belonging to the field of computer graphics; the method comprises the following steps: an input model is parameterized to acubic surface, and a cube is drawn by utilizing a cubic parametric coordinate and topology connection relationship of the model; for a triangle which spans two or three surfaces of the cube, intersection point of the side of the triangle and the edge of the cube and attribute value of a top point contained by the triangle are extracted, and a standard cube is generated according to the attribute value of an extracted point and the topology connection relationship of the model; the parametric coordinate of the standard cube is utilized as a spatial coordinate, a geometric image and a differencegeometric image of the model are constructed; a re-sampling model is restrained by the difference geometric image to reconstruct the model. The reconstruction method can well keep the model detail before sampling, and a regular geometric model is generated, so as to be beneficial to acceleration drawing of the model; when variant interpolation of the model is carried out, the generated intermediate model also can keep smooth geometric detail.

The present invention discloses a preparation method of monodisperse trigonal nano silver sheet. Said method includes the following steps: (1), preparing three-component solution system formed from water, PVP and n-pentanol; (2), adding 0.1-0.6% of alcohol solution of AgNO3 into the above-mentioned system under the condition of continuous stirring, then placing the above-mentioned material into a constant temperature oven to make heat treatment at 60-100deg.C; and (3), centrifugalizing the above-mentioned reaction solution so as to obtain the invented high-purity trigonal nano silver sheet whose average side length can be regulated in the range of 24-120nm.

The present invention relates to prism-nonlinear optical crystal couplers for frequency conversion, including M pieces of nonlinear optical crystal and one coupling prism stuck to the incident surface or / and exit surface of the crystal by optical stick or a matching liquid. The coupling prisms are the same triangle prisms of right triangle prism, equilateral triangle prism, or inequlateral triangle prism, or are different triangle prisms. It is hopeful to obtain frequency 6th harmonic output.

The invention relates to a high lighting effect pattern substrate and a manufacturing method thereof. Centrosymmetric patterns are etched on the substrate and extend to the periphery of the substrate. The centrosymmetric patterns are quadrates, regular hexagons, circles, equilateral rhombuses with 60 degrees of angles, regular hexagons formed by six same regular triangles, regular hexagons formed by six symmetrically distributed same regular triangles with circular centers and embedded circles, and regular hexagons formed by six symmetrically distributed same regular hexagons with circular centers and being separated from the circles. The centrosymmetric patterns extend to the periphery of the substrate as reference units so that the vertical distance between the side lengths of two adjacent quadrates, the vertical distance between the side lengths of two adjacent regular triangles, the vertical distance between the side lengths of two adjacent regular hexagons, the vertical distance between the side lengths of two adjacent equilateral rhombuses, the shortest distance between circumferences of two adjacent circles and the shortest distance between the circles and the adjacent regular hexagon are mutually equal.

A piezoelectric film element is provided, which is capable of improving piezoelectric properties, having on a substrate at least a lower electrode, a lead-free piezoelectric film, and an upper electrode, wherein at least the lower electrode out of the lower electrode and the upper electrode has a crystal structure of a cubic crystal system, a tetragonal crystal system, an orthorhombic crystal system, a hexagonal crystal system, a monoclinic crystal system, a triclinic crystal system, a trigonal crystal system, or has a composition in which one of these crystals exists or two or more of them coexist, and crystal axes of the crystal structure are preferentially oriented to a specific axis smaller than or equal to two axes of these crystals, and a ratio c / a′ is set in a range of 0.992 or more and 0.999 or less, which is the ratio of a crystal lattice spacing c in a direction of a normal line to the substrate surface, with respect to a crystal lattice spacing a′ whose inclination angle from the substrate surface is in a range of 10° or more and 30° or less.

The invention discloses a crown appearance extract method based on shape analysis. The data treatment of the invention is characterized in that a laser scanner carries out single-sweep on a whole plant to obtain the single-sweep point cloud data of the plant; firstly, a root node is found from the point cloud data, and then the point cloud data is divided into branch point cloud and leaf point cloud by a shortest distance method; a corresponding skeleton is extracted from the branch point cloud, and the skeleton is divided into a plurality of parts according to the branching characteristics of a tree, and classified branch skeletons are utilized to classify the leaf point cloud; Delaunay triangulation is carried out on each classified leaf point cloud to obtain a tetrahedron and a triangular patch; the triangular patch is divided into three classes, such as exterior, interior, boundary and the like, wherein the triangular patch located on the boundary forms a sealed body which is used for representing the shape of the classified leaf point cloud; and the shape integration of each class of the leaf point cloud represents the shape of the whole crown.