42 results about "Truncated octahedron" patented technology

The invention discloses multi-defect multi-doped titanium oxide nanoparticles with high visible-light catalytic activity and a preparation method of the titanium oxide nanoparticles. The titanium oxide has the size of 10-20nm, the particle size of 10-20nm and the specific surface area of 140-160cm<3>, and the particles refer to truncated octahedron nanoparticles coexisting on surfaces {001} and {101}. The preparation method comprises the following steps: respectively taking tetrabutyl titanate and ammonium hexafluorotitanate as a titanium source and a fluorine source, synthesizing a mixture of TiO2 and NH4TiOF3 by using a hydrothermal method, further treating the prepared sample by using boric acid, enabling the NH4TiOF3 to be subjected to topological transformation so as to be transformed into the titanium oxide, and in-situ doping of a small amount of nitrogen is realized so as to obtain the titanium oxide exposed on the {001} crystal face. Lots of vacancy is introduced into the surface of the titanium oxide by adopting a photo-reduction method, and fluorine doping is realized. According to oxygen vacancy introduced into the invention, the absorption of the titanium oxide on visible light can be obviously improved, and due to exposure of the {001} crystal face and co-doping of nitrogen-fluorine atoms, separation of carriers in the photocatalysis process is improved. Therefore, rhodamine B can be efficiently degraded under visible light radiation.

The invention discloses a three-dimensional environment-oriented wireless sensor network coverage enhancement method and system. The method includes: using truncated octahedrons to seamlessly stack the three-dimensional area to be monitored, and determining the centroid coordinate matrix; calculating the distance matrix according to the centroid coordinate matrix and the position matrix of each sensor node at the current iteration number; The algorithm solves the bipartite graph maximum matching model; exchanges the optimal mobile task matrix corresponding to the optimal solution; moves N sensor nodes according to the exchanged results, and determines the position coordinates of the moved N sensor nodes; Calculate the coverage rate of the wireless sensor network according to the position coordinates of the moved N sensor nodes; iterate according to the coverage rate and the current iteration value until the end. The invention can reduce the total mobile energy consumption of each sensor node and balance the remaining energy of each sensor node under the premise of improving the coverage rate of the wireless sensor network in the three-dimensional environment.

Tensegrity structures and methods of constructing tensegrity structures of three-dimensional tensegrity lattices formed from truncated octahedron elementary cells. Space-tiling translational symmetry is achieved by performing recursive reflection operations on the elementary cells. This topology exhibiting unprecedented static and dynamic mechanical properties.

The invention relates to a preparing method of a monoclinic phase truncated octahedron bismuth vanadate crystal. The method comprises the steps of obtaining a solution A through bismuth nitrate pentahydrate, a nitric acid solution and a fluorinion solution; obtaining a solution B through ammonium metavanadate and a sodium hydroxide solution; obtaining a solution C through the solution A and the solution B; conducting a microwave hydrothermal reaction on the solution C to obtain a crystal sample; cleaning and drying the crystal sample to obtain the monoclinic phase truncated octahedron bismuthvanadate crystal. According to the preparing method, the microwave hydrothermal reaction is adopted for preparing the bismuth vanadate crystal, and by controlling the mole ratio of fluorine ions to bismuth ions, the reaction temperature, the reaction time and other parameters, the bismuth vanadate crystal with a monoclinic phase truncated octahedron is prepared and synthesized; the prepared crystal has the advantages of being high in purity and good in photocatalytic performance.