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Shape‐Controlled Bridged Silsesquioxanes: Hollow Tubes and Spheres
Chemistry – A European Journal, 2003AbstractA new approach for the morphological control of bridged silsesquioxanes has been achieved by the hydrolysis of silylated organic molecules bearing urea groups. The urea groups are responsible for the auto‐association of the molecules through intermolecular hydrogen‐bonding interactions.
Joël J E, Moreau +3 more
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ACM Transactions on Graphics, 2013
Shape approximation algorithms aim at computing simple geometric descriptions of dense surface meshes. Many such algorithms are based on mesh decimation techniques, generating coarse triangulations while optimizing for a particular metric which models the distance to the original shape.
Thiery J.-M., Guy E., Boubekeur T.
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Shape approximation algorithms aim at computing simple geometric descriptions of dense surface meshes. Many such algorithms are based on mesh decimation techniques, generating coarse triangulations while optimizing for a particular metric which models the distance to the original shape.
Thiery J.-M., Guy E., Boubekeur T.
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Short spirals on the shape sphere
AIP Conference Proceedings, 2012Spirals have many applications in mathematics, physics and industry. The set of all spirals leaves invariant under an arbitrary similarity transformation. A class of short spirals in the plane has been recently introduced. The most general definition of a short spiral is due to A. Kurnosenko.
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Bézier curves on the shape sphere
AIP Conference Proceedings, 2012There are two important models of the simplicial shape space of order (2,3). The first model introduced by D. Kendall is a two-dimensional sphere with radius 1/2. Therefore, this model is called the shape sphere. The second model introduced by F. Bookstein is a one-point extension of the Euclidean plane.
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Bubbly Continua with the Shape of Spheres
Michigan Mathematical JournalThis paper concerns the question posed by \textit{W. Kuperberg} [Fundam. Math. 83, 7--23 (1973; Zbl 0269.54020)]: if a \(q\)-dimensional compactum \(X\) is without small \(q\)-dimensional cycles (WSC\({}_q\)), then is it true that any family of mutually disjoint \(q\)-bubbles contained in \(X\) is finite?
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Shaping of porous geopolymer spheres
2017This preliminary study reports a simple process for the production of geopolymer porous spheres through an injection and solidification method using liquid nitrogen. Metakaolin-based geopolymer slurries were prepared in advance, using a potassium-based disilicate as alkaline activating solution, and left at room temperature for several hours ...
E Papa, R Bendoni, V Medri, E Landi
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Lattice packing of spheres and the Wulff‐Shape
Mathematika, 1996The shape of large densest sphere packings in a lattice \(L \subset E^d (d\geq 2)\), measured by parametric density, tends asymptotically not to a sphere but to a polytope, the Wulff-shape, which depends only on \(L\) and the parameter. This is proved via the density deviation, derived from parametric density and diophantine approximation.
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Preparation of sphere-shaped nanoscale carbon nitride polymer
Russian Chemical Bulletin, 2001The carbon nitride polymer of the previously unknown sphere-shaped structure was prepared both by a template-directed solid-state and solution phase syntheses from cyanuric chloride or fluoride and lithium nitride. The obtained polymer powder was characterized by SEM/EDAX, TEM, XRD, TGA, XPS, (13C) MAS NMR, LD/MS, FTIR, UV-visible, and Raman ...
J. L. Zimmerman +3 more
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Huffman-Coded Sphere Shaping for Extended-Reach Single-Span Links
IEEE Journal of Selected Topics in Quantum Electronics, 2021Pavel Skvortcov +2 more
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