Results 11 to 20 of about 292,234 (282)
Journal of Combinatorial Theory, Series B, 1979 AbstractThe book thickness bt(G) of a graph G is defined, its basic properties are delineated, and relations are given with other invariants such as thickness, genus, and chromatic number. A graph G has book thickness bt(G) ≤ 2 if and only if it is a subgraph of a hamiltonian planar graph, but we conjecture that there are planar graphs with arbitrarily
Bernhart, Frank, Kainen, Paul C
openaire +4 more sources
The Book Thickness of 1-Planar Graphs is Constant [PDF]
Algorithmica, 2016 In a book embedding, the vertices of a graph are placed on the spine of a book and the edges are assigned to pages, so that edges on the same page do not cross. In this paper, we prove that every $1$-planar graph (that is, a graph that can be drawn on the plane such that no edge is crossed more than once) admits an embedding in a book with constant ...
Bekos, Michael A. +3 more
openaire +5 more sources
Organics, 2023 This article presents results on the use of a new material as a solidifying agent and/or color-fixing agent. A special polysaccharide material extracted from the prickly pear cactus (Opuntia ficus indica) was tested on historical materials and modern ...
Lucia Emanuele +4 more
doaj +1 more source
Stacks, Queues and Tracks: Layouts of Graph Subdivisions [PDF]
Discrete Mathematics & Theoretical Computer Science, 2005 A \emphk-stack layout (respectively, \emphk-queuelayout) of a graph consists of a total order of the vertices, and a partition of the edges into k sets of non-crossing (non-nested) edges with respect to the vertex ordering.
Vida Dujmović, David R. Wood
doaj +1 more source
An introduction to neutron reflectometry [PDF]
EPJ Web of Conferences, 2020 Specular neutron reflectivity is a neutron diffraction technique that provides information about the structure of surfaces or thin films. It enables the measurement of the neutron scattering length density profile perpendicular to the plane of a surface ...
Cousin Fabrice, Fadda Giulia
doaj +1 more source
Book Thickness of Planar Zero Divisor Graphs [PDF]
Missouri Journal of Mathematical Sciences, 2015 Let $R$ be a finite commutative ring with identity. We form the zero divisor graph of $R$ by taking the nonzero zero divisors as the vertices and connecting two vertices, $x$ and $y$, by an edge if and only if $xy=0$. We establish that if the zero divisor graph of a finite commutative ring with identity is planar, then the graph has a planar supergraph
McKenzie, Thomas, Overbay, Shannon
openaire +2 more sources
Upper Pedicle Breast Flap [PDF]
Revista Brasileira de Cirurgia Plástica, 2020 Introduction: Here we propose a tactic to fill the upper poles of breasts that are emptied by ptosis in primary and secondary cases to obtain anatomically beautiful breasts with sufficient breast volume.
Antônio Roberto Bozola +1 more
doaj +1 more source
Editorial for the Special Issue: “Ten Years of Remote Sensing at Barcelona Expert Center”
Remote Sensing, 2020 This book celebrates the ten year anniversary of the Barcelona Expert Center by presenting recent contributions related to the topics on which the team has been working during those years.
Justino Martínez +3 more
doaj +1 more source
Discourse in a coma; A Comment on a Comma in the Title of Jean François Lyotard’s Discourse, Figure [PDF]
, 2013 One of the key claims in Jean-Francois Lyotard's "Discourse, Figure" is that the dialectical method (the backbone of Western philosophy) tends to obscure and hide all which is invisible, illegible and sensual.
Rubinstein, Daniel
core +1 more source
BMC Emergency Medicine, 2021 Background Ultrasonography (US) is recently used frequently as a tool for airway assessment prior to intubation (endotracheal tube (ETT) placement), and several indicators have been proposed in studies with different reported performances in this regard.
Mehran Sotoodehnia +4 more
doaj +1 more source