Results 61 to 70 of about 6,990 (214)

Convex pentagons and convex hexagons that can form rotationally symmetric tilings

, 2020
In this study, the properties of convex hexagons that can generate rotationally symmetric edge-to-edge tilings are discussed. Since the convex hexagons are equilateral convex parallelohexagons, convex pentagons generated by bisecting the hexagons can ...
Sugimoto, Teruhisa
core  

Self‐assembly and Lateral Cobalt Coordination of a Fivefold Symmetric Cyanostar Macrocycle on an Au(111) Surface

Chemistry – A European Journal, EarlyView.
Herein, we report the first example of the formation of a close‐packed, regular 2D monolayer of a fivefold symmetric cyanostar macrocycle on an Au(111) surface under ultra‐high vacuum and the structural modification of such self‐assembled architecture upon cobalt atom deposition.
Lenka Černá, Miguel Martínez García, Shanmugasibi K. Mathialagan, Sofía O. Parreiras, Koen Lauwaet, José Ignacio Urgel, Aurelio Gallardo, Amar H. Flood, Tomás Torres, José M. Gallego, Giovanni Bottari, David Écija   +11 more
wiley   +1 more source

Chiral Modulations in Non-Heisenberg Models of Non-Centrosymmetric Magnets Near the Ordering Temperatures

Magnetism
The structure of skyrmion and spiral solutions, investigated within the phenomenological Dzyaloshinskii model of chiral magnets near the ordering temperatures, is characterized by the strong interplay between longitudinal and angular order parameters ...
Andrey O. Leonov
doaj   +1 more source

Quasi Regular Polyhedra and Their Duals with Coxeter Symmetries Represented by Quaternions I

, 2010
In two series of papers we construct quasi regular polyhedra and their duals which are similar to the Catalan solids. The group elements as well as the vertices of the polyhedra are represented in terms of quaternions. In the present paper we discuss the
Carter R W, Coxeter H S M, Coxeter H S M, Humphreys J E, Janner A, Koca M, M Koca, N O Koca, Penrose R, Penrose R, Senechal M   +10 more
core   +1 more source

Human coronary artery organ‐chip with circulating immune cells recapitulates anti‐inflammatory effect of pulsatile wall strain

Interdisciplinary Medicine, EarlyView.
A fully characterised organ‐on‐a‐chip model of the human coronary artery with endothelial and smooth muscle cells, plus circulating immune cells, created on the Emulate platform. The model successfully recapitulates the physiological effects of pulsatile vessel dilation on cell morphology and the localised inflammatory susceptibility to TNF‐α ...
Yu Hou, Georgios Ziakas, Tim Hopkins, Wen Wang, Hazel R. C. Screen, Martin M. Knight   +5 more
wiley   +1 more source

From one cell to the whole froth: a dynamical map

, 1996
We investigate two and three-dimensional shell-structured-inflatable froths, which can be constructed by a recursion procedure adding successive layers of cells around a germ cell. We prove that any froth can be reduced into a system of concentric shells.
B. K. Southern, B. R. Pollard, D. A. Lavis, D. Boosé, D. P. Shoemaker, D. Weaire, D. Weaire, D. Weaire, E. Kreyszig, F. C. Frank, H. G. Schuster, H. M. S. Coxeter, J. A. Glazier, J. F. Sadoc, J. Stavans, M. Goldberg, N. Rivier, N. Rivier, N. Rivier, P. M. Oliveira, R. E. Williams, R. Kusner, R. Williams, S. S. Chern, T. Aste, T. Aste, W. Thomson (Lord Kelvin)   +26 more
core   +2 more sources

Non‐Uniform Programmable Photonic Waveguide Meshes

Laser &Photonics Reviews, EarlyView.
Integrating defect cells into uniform hexagonal waveguide meshes overcomes the fundamental spectral and temporal limitations of programmable photonics. By leveraging the Vernier effect through non‐uniform coupled cavities, this architecture achieves a tenfold increase in free spectral range and ultra‐fast sampling times, paving the way for next ...
Cristina Catalá‐Lahoz, José Capmany
wiley   +1 more source

Rotationally symmetric tilings with convex pentagons and hexagons [PDF]

Elemente der Mathematik, 2016
In contrast to many known results concerning periodic tilings of the Euclidean plane with pentagons, here tilings with rotational symmetry are investigated. A certain class of convex pentagons is introduced. It can be shown that for any given symmetry type $\mathbf{C}_{n}$ or $\mathbf{D}_{n}$ there exists a monohedral tiling generated by a pentagon ...
openaire   +3 more sources

The Ammann–Kramer–Neri tiling model of a P‐ZnMgEr Bergman‐type quasicrystal based on in‐house X‐ray diffraction

Acta Crystallographica Section B, EarlyView.
A structural solution is presented of a primitive icosahedral ZnMgEr quasicrystal representing the Bergman‐type family. The structure model is based on atomic decoration of the Ammann–Kramer–Neri tiling.This study presents the atomic structure solution of a primitive icosahedral Zn70.83Mg20.31Er8.86 quasicrystal using in‐house X‐ray diffraction and the
Ireneusz Buganski, Stanislav Vrtnik, Andreja Jelen, Jože Luzar, Radoslaw Strzalka, Janusz Wolny, Joachim Kusz, Nobuhisa Fujita   +7 more
wiley   +1 more source

‘The Good Couscous That Pleases Us!’: The Meanings of Enduring Imperialist Imagery in Postcolonial French Food Advertising, 1970–2000

Gender &History, EarlyView.
ABSTRACT This article examines a wave of Orientalism‐inspired food commercials that appeared on television in France between 1975 and 2000. Older commercials for couscous were more banal, emphasizing a given product's superiority or affordability. Around 1975, however, there was a concerted shift in the advertising; new spots contained exoticized ...
Kelly Ricciardi Colvin
wiley   +1 more source