Results 21 to 30 of about 14,623 (104)

Magnetic properties of undoped Cu2O fine powders with magnetic impurities and/or cation vacancies

, 2008
Fine powders of micron- and submicron-sized particles of undoped Cu2O semiconductor, with three different sizes and morphologies have been synthesized by different chemical processes.
Chinping Chen, Dietl T, Dietl T, He L, Hua Zhang, Jing Lu, Li Q, Lin Guo, Lin He, Lin Lai, Schlafer H L, Yadong Li, Yoon S D   +12 more
core   +1 more source

Bis{µ-(2,2′-bipyridine-1κ²N,N′)-(6,6′-dicarbonyl-1κ²O,O′:2κO′)bis(N,N-diethylthioureato-2κS)}(acetato-1κO)(µ-acetato-1κO:2-κO′)(methanol-2κO)thoriumnickel

Molbank
Reactions of 2,2′-bipyridine-6,6′-dicarbonyl-bis(N,N-diethylthiourea), H2Lbipy, with a mixture of thorium nitrate hydrate and nickel acetate hydrate in methanol with NEt3 as a supporting base yield brown single crystals of the bimetallic complex [ThNi ...
Christelle Njiki Noufele, Chien Thang Pham, Ulrich Abram   +2 more
doaj   +1 more source

A curvature theory for discrete surfaces based on mesh parallelity

, 2009
We consider a general theory of curvatures of discrete surfaces equipped with edgewise parallel Gauss images, and where mean and Gaussian curvatures of faces are derived from the faces' areas and mixed areas.
Bobenko, Alexander I., Pottmann, Helmut, Wallner, Johannes   +2 more
core   +4 more sources

Flat Zipper-Unfolding Pairs for Platonic Solids [PDF]

, 2010
We show that four of the five Platonic solids' surfaces may be cut open with a Hamiltonian path along edges and unfolded to a polygonal net each of which can "zipper-refold" to a flat doubly covered parallelogram, forming a rather compact representation ...
O'Rourke, Joseph
core   +2 more sources

Geometrical properties of rigid frictionless granular packings as a function of particle size and shape

, 2017
Three-dimensional discrete numerical simulation is used to investigate the properties of close-packed frictionless granular assemblies as a function of particle polydispersity and shape.
Camenen, Jean-François, Descantes, Yannick   +1 more
core   +3 more sources

3-manifolds efficiently bound 4-manifolds

, 2007
It is known since 1954 that every 3-manifold bounds a 4-manifold. Thus, for instance, every 3-manifold has a surgery diagram. There are several proofs of this fact, including constructive proofs, but there has been little attention to the complexity of ...
Brock, Brock, Burlet, Costantino, Dylan Thurston, Eilenberg, Francesco Costantino, Gromov, Hass, Hass, Hass, Hatcher, Hatcher, Kirby, Lackenby, Leksin, Levine, Markov, Markov, Martelli, Matveev, Mijatović, Murakami, Reshetikhin, Roberts, Rubinstein, Saeki, Turaev   +27 more
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VARIATIONS OF CONCAVE PYRAMIDS OF SECOND SORT WITH AN EVEN NUMBER OF BASE SIDES

Journal of Industrial Design and Engineering Graphics, 2015
Concave pyramids of second sort (CP II) are formed similarly to concave cupolae of second sort (CC II) with a comparable logic of emergence to the regular-faced convex pyramids.
OBRADOVIĆ Marija, MIŠIĆ Slobodan, POPKONSTANTINOVIĆ Branislav   +2 more
doaj  

Affinely adjustable robust optimal scheduling of a power system considering the flexibility of supply and demand

Energy Conversion and Economics
As the integration of renewable energy sources, such as wind power and photovoltaics, continues, the issue of system uncertainty has become more pronounced. This paper proposes a stochastic power system dispatch method based on affinely adjustable robust
Yumin Zhang, Yongchen Zhang, Xizhen Xue, Xingquan Ji, Yunqi Wang, Pingfeng Ye   +5 more
doaj   +1 more source

Small Chvatal rank [PDF]

, 2009
We propose a variant of the Chvatal-Gomory procedure that will produce a sufficient set of facet normals for the integer hulls of all polyhedra {xx ...
Bogart, Tristram, Raymond, Annie, Thomas, Rekha R.   +2 more
core  

Banach-valued Holomorphic Functions on the Maximal Ideal Space of H^\infty [PDF]

, 2011
We study Banach-valued holomorphic functions defined on open subsets of the maximal ideal space of the Banach algebra H^\infty of bounded holomorphic functions on the unit disk D\subset C with pointwise multiplication and supremum norm. In particular, we
Brudnyi, Alexander
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