In sheet silicates, each silicate tetrahedron is joined at 3 corners to other tetrahedra in sheet form. From Wordnik.com. [Open thread: questions and explanations - The Panda's Thumb] Reference
Five points form the vertices of two regular tetrahedra, joined on a common face situated in the horizontal plane. From Wordnik.com. [Wolfram Blog : Equations or Exploding Teapots?] Reference
The crystalline structure common to amphibole minerals consists of two ribbons of silicate tetrahedra placed back to back. From Wordnik.com. [Geology of asbestos] Reference
Each of the 3 corners “shares” an oxygen atom with other tetrahedra, giving a ratio in the formula of 1 Si to 2.5 O, or Si2O5. From Wordnik.com. [Open thread: questions and explanations - The Panda's Thumb] Reference
Between craters the basalt was strewn in small tetrahedra, with angles rubbed and rounded, stone tight to stone like tesseract upon. From Wordnik.com. [Seven Pillars of Wisdom] Reference
In the case of chrysotile, an octahedral brucite layer having the formula (Mg6O4 (OH) 4) -4 is intercalated between each silicate tetrahedra sheet. From Wordnik.com. [Geology of asbestos] Reference
There were even stranger shapes, exploiting almost every possibility of geometry -- bizarre, translucent kites, tetrahedra, spheres, polyhedra, tangles of twisted ribbons. From Wordnik.com. [2010 Odyssey Two]
There were even stranger shapes, exploiting almost every possibility of geometry - bizarre, translucent kites, tetrahedra, spheres, polyhedra, tangles of twisted ribbons. From Wordnik.com. [2061 Odyssey Three]
The tetrahedra separate as usual, but liberate eight. From Wordnik.com. [Occult Chemistry Clairvoyant Observations on the Chemical Elements] Reference
And tetrahedra may be able to pack together randomly even more efficiently, says. From Wordnik.com. [New Scientist - Online News] Reference
On the role of rotating tetrahedra for generating auxetic behavior in NAT and …. From Wordnik.com. [iMechanica - Comments] Reference
In a test tube, it can form cubes, spheres, barrels and tetrahedra, among other shapes. From Wordnik.com. [PhysOrg.com - latest science and technology news stories] Reference
Here we show that tetrahedra pack even more densely, and in a completely unexpected way. From Wordnik.com. [Naturejobs - All Jobs] Reference
For example, now we can experiment not just with cubes, but with parallelepipeds or tetrahedra. From Wordnik.com. [Planet Haskell] Reference
"We can't rule out the possibility that the densest packings of tetrahedra will be disordered.". From Wordnik.com. [New Scientist - Online News] Reference
Silica molecules can hook together, forming a three-dimensional compound called a silica-tetrahedra. From Wordnik.com. [Scientific American] Reference
They found that the tetrahedra were packed tightly enough to occupy 76 per cent of their containers. From Wordnik.com. [New Scientist - Online News] Reference
More information: "Disordered, quasicrystalline and crystalline phases of densely packed tetrahedra.". From Wordnik.com. [PhysOrg.com - latest science and technology news stories] Reference
The article is titled "Disordered, quasicrystalline and crystalline phases of densely packed tetrahedra.". From Wordnik.com. [EurekAlert! - Breaking News] Reference
A classic 3D fractal is the Sierpinski tetrahedron, which is a tetrahedron of tetrahedra of tetrahedra, etc. From Wordnik.com. [MAKE Magazine] Reference
Their trick is to think of galaxies as points in 3D space and to fill the space between them with tetrahedra. From Wordnik.com. [Technology Review RSS Feeds] Reference
An optional post-processing step combines adjacent tetrahedra into pyramid and prism elements in the extrusion layer. From Wordnik.com. [ThomasNet News - Today's New Product News] Reference
Within them, the gyrating and magnetic holium or dysprosium ions sit at the corners of four-sided pyramids, or tetrahedra. From Wordnik.com. [Recently Uploaded Slideshows] Reference
The atoms are arranged in two tetrahedra with a common apex, and the relationship is maintained in the meta-body, a septet. From Wordnik.com. [Occult Chemistry Clairvoyant Observations on the Chemical Elements] Reference
The greater density of liquid water implies that the molecules are more closely packed than the simple tetrahedra seen in ice. From Wordnik.com. [PhysOrg.com - latest science and technology news stories] Reference
In a recent simulation, Torquato and student Yang Jiao found a way to pack tetrahedra that took up more than 82 per cent of space. From Wordnik.com. [New Scientist - Online News] Reference
The question is important because it's still not clear what kind of packing - random or ordered - is most efficient for tetrahedra. From Wordnik.com. [New Scientist - Online News] Reference
Molybdenum presents us with only two new forms, and these are merely four-atomed tetrahedra, occurring in pairs as object and image. From Wordnik.com. [Occult Chemistry Clairvoyant Observations on the Chemical Elements] Reference
In the process, the Kent State professors and their colleagues discovered that quasicrystals formed when the tetrahedra were compressed. From Wordnik.com. [EurekAlert! - Breaking News] Reference
It should be noted that it is not possible to show five of the prisms in the five intersecting tetrahedra of prisms, and 30 atoms must, therefore, be added in counting. From Wordnik.com. [Occult Chemistry Clairvoyant Observations on the Chemical Elements] Reference
"cigar" - bearing tetrahedra, and six radiating arms. From Wordnik.com. [Occult Chemistry Clairvoyant Observations on the Chemical Elements] Reference
2 Kent State professors help break record for packing tetrahedra. From Wordnik.com. [EurekAlert! - Breaking News] Reference
HELIUM: Two tetrahedra of 24 atoms 48. From Wordnik.com. [Occult Chemistry Clairvoyant Observations on the Chemical Elements] Reference
The central tetrahedra appear as usual. From Wordnik.com. [Occult Chemistry Clairvoyant Observations on the Chemical Elements] Reference
Gold contains no less than twenty tetrahedra. From Wordnik.com. [Occult Chemistry Clairvoyant Observations on the Chemical Elements] Reference
4 tetrahedra (In is green, N is blue) consists of large cages interconnected through small windows (center). From Wordnik.com. [Chemical & Engineering News: Latest News] Reference
Central tetrahedra 120. From Wordnik.com. [Occult Chemistry Clairvoyant Observations on the Chemical Elements] Reference
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