We describe the geometric and engineering design challenges that were overcome to create a new compact, 10-inch diameter spherical loudspeaker array with integrated class-D amplifiers and a 120 independent channel digital audio interface using Gigabit Ethernet. A special hybrid geometry is used that combines the maximal symmetry of a triangular-faceted icosahedron with the compact planar packin...

The three known classes of convex polyhedron with equal edge lengths and polyhedral symmetry--tetrahedral, octahedral, and icosahedral--are the 5 Platonic polyhedra, the 13 Archimedean polyhedra--including the truncated icosahedron or soccer ball--and the 2 rhombic polyhedra reported by Johannes Kepler in 1611. (Some carbon fullerenes, inorganic cages, icosahedral viruses, geodesic structures, ...

Studies of three–dimensional and two–dimensional condensed phases have shown that many– body interactions contribute ∼ 10% to the equations of state of noble gases. This paper assesses the importance of three–body triple dipole interactions for quasi–one–dimensional phases of He, Ne, H2, Ar, Kr and Xe confined within interstitial channels or on the external surfaces of nanotube bundles. We find...

Ab initio electronic structure calculations on several low-lying valence states of B, have been carried out using correlation-consistent polarized valence double-zeta basis sets and completeactive-space self-consistent field treatments of electron correlation. Stable triangular structures, linear structures, and Jahn-Teller unstable structures are all observed. Equilibrium geometries, energies,...

In this paper, three novel designs of broadband patch antenna are proposed. The first design propose broadband slotted equilateral triangular patch antenna (ETPA) operating on frequency around 1800 MHz. The second design propose broadband slotted right angle isosceles triangular patch antenna RAITPA operating on frequency around 2400 MHz. The third design proposes wideband V-Slotted and shorted...

We consider an extension of the triangular-distance Delaunay graphs (TD-Delaunay) on a set P of points in general position in the plane. In TD-Delaunay, the convex distance is defined by a fixed-oriented equilateral triangle 5, and there is an edge between two points in P if and only if there is an empty homothet of 5 having the two points on its boundary. We consider higher-order triangular-di...

This work demonstrates the fabrication of metallic nanoprism (triangular nanostructure) arrays using a low-cost and high-throughput process. In the method, the triangular structure is defined by the shadow of a pyramid during angle evaporation of a metal etching mask. The pyramids were created by nanoimprint lithography in polymethylmethacrylate (PMMA) using a mould having an inverse-pyramid-sh...

A different kind of approach was employed in designing a multi-band antenna by using chebyshev distribution to fulfill broadband and military applications on FR4 substrate. The presented approach is based on combining a rectangular and a equilateral triangular patch with proper slots placed on each part and is simulated using concerto software. By changing certain feed position only we can achi...