197,398 research outputs found
Corrigendum to "Graphs and digraphs with all 2--factors isomorphic" [J. of Comb. Th. Ser. B 92, (2) (2004) 395--404]
No full textWe point out several errors in our article [M. Abreu, R.E.L. Aldred, M. Funk, B. Jackson, D. Labbate, J. Sheehan, Graphs and digraphs with all 2-factor isomorphic, J. Combin. Theory Ser. B 92 (2004) 395–404] which were caused by our misquoting of a theorem of C. Thomassen. We also describe how the correct statement of Thomassen’s theorem, together with another of his theorems, can be used to obtain weaker results than those incorrectly stated in our original article
Use of problem-based learning in Canadian and U.S. dental schools: results of a survey
No full textCopyright © 2002 Journal of the Canadian Dental Association Authored by The International Dental Problem-Based Learning Network.Clark, DC; Aldred, MJ; Aldred, SE; Schuler, C; Wang, HC; Petersson, K; Nilner, M; Svensäter, G; Rohlin, M; Winning, T; Corbet, E; Coulter, I; Songpaisan, Y; McCreary, C
Restricted matching in graphs of small genus
No full textAbstractA graph G with at least 2n+2 vertices is said to be n-extendable if every set of n disjoint edges in G extends to (i.e., is a subset of) a perfect matching. More generally, a graph is said to have property E(m,n) if, for every matching M of size m and every matching N of size n in G such that M∩N=0̸, there is a perfect matching F in G such that M⊆F, but F∩N=0̸. G is said to have property E(0,0) if it has a perfect matching. The study of the properties E(m,n) is referred to as the study of restricted matching extension.In [M. Porteous, R. Aldred, Matching extensions with prescribed and forbidden edges, Australas. J. Combin. 13 (1996) 163–174; M. Porteous, Generalizing matching extensions, M.A. Thesis, University of Otago, 1995; A. McGregor-Macdonald, The E(m,n) property, M.Sc. Thesis, University of Otago, 2000], Porteous and Aldred, Porteous and McGregor-Macdonald, respectively, studied the possible implications among the properties E(m,n) for various values of m and n. In an earlier paper [R.E.L. Aldred, Michael D. Plummer, On restricted matching extension in planar graphs, in: 17th British Combinatorial Conference (Canterbury 1999), Discrete Math. 231 (2001) 73–79], the present authors completely determined which of the various properties E(m,n) always hold, sometimes hold and never hold for graphs embedded in the plane. In the present paper, we do the same for embeddings in the projective plane, the torus and the Klein bottle
On matching extensions with prescribed and proscribed edge sets II
No full textAbstractLet G be a graph with at least 2(m + n + 1) vertices. Then G is E(m, n) if for each pair of disjoint matchings M, N ⊆ E(G) of size m and n, respectively, there exists a perfect matching F in G such that M ⊆ F and F ∩ N = Ø;. In this paper, we extend previous results due to Chen (Discrete Math., to appear) as well as results of the present authors (Aldred et al., Discrete Math., to appear) concerning the property E(m,n). The first extends a result on claw-free graphs and the second generalizes a result about bipartite graphs
Unravelling the crystal and molecular structure of a 1,3-linked aromatic poly(ether-ketone)
No full textHighly-oriented fibres of the aromatic polyetherketone [-O(1,4-Ar)CO(1,3-Ar)CO(1,4-Ar)-]n (Ar = phenylene) obtained by nucleophilic polycondensation of F(1,4-Ar)CO(1,3-Ar)CO(1,4-Ar)F with HO(1,4-Ar)CO(1,3-Ar)CO(1,4-Ar)OH afford, after annealing, very well-resolved X-ray fibre patterns. The new diffraction data are used to test two different published models for the crystal and molecular structure of this polymer, both based on a three-ring crystallographic repeat, and it is shown by diffraction-modelling that neither of these structures is compatible with the new fibre-data. In contrast, we report a novel structure, based on a six-ring crystallographic repeat, that gives a simulated fibre-diffraction pattern in very good agreement with the experimental pattern. Crystal data for the new structure are: orthorhombic, space group Pcam, a = 7.67, b = 6.13, c = 29.72 Å, two chains per cell, V = 1397 Å3 ρ = 1.43. Unusually, the two chains in the unit cell are related by an a-glide, meaning that the carbonyl groups in the two chains are aligned anti-parallel rather than having the more generally found parallel arrangement resulting from the presence of a b-glide. The new structure is shown to be fully compatible with previously published X-ray powder and electron diffraction data
Dr. Duane M. Jackson, Morehouse College, July 2011
No full textThis video is a conversation with Dr. Duane M. Jackson. Dr. Jackson talks about his paper, "Recall and the Serial Position Effect: The Role of Primacy and Recency on Accounting Students' Performance." Jackie Daniel, AUC Woodruff Library, is the interviewer
"Reflections on the subject of Emigration from Europe with a view to Settlement in the United States" By M. Carey.
No full text"Reflections on the subject of Emigration from Europe with a view to Settlement in the United States: containing bried sketches of the moral and political character of those states.
By M. Carey, member of the American philosophical, and of the American Antiquarian Society, and author of The Olive Branch, Cindiciae Hibernicae, essays on banking, on political economy, and on internal improvement.
To which are now added the English editor's comments on the subject; together with Important Advice to Emigrants, and Cautions Against Impositions Practiced in the Outports
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Dr. Glendon Swarthout
No full textHosted by Roger M. Busfield, MSU Assistant Professor of Speech and Theater, Meet the Author is designed to introduce a general audience to a contemporary author and their work through in-depth interviews. This episode features a conversation between Dr. Glendon Swarthout, prolific author and English professor at MSU, and assistant professors Sam S. Baskett and Theodore B. Strandness
Characterisation of stachybotrys chartarum from water damaged buildings
No full textFungal contaminated buildings and related adverse human health implications have long been a topical issue throughout the world and concern is mounting with regards to the presence of more toxigenic fungi found in buildings and the associated health risks. These risks are compounded when homes are affected by water damage as a result of water intrusion problems, in particular flooding. With the ever changing climate and unpredictable weather conditions the frequency of flash flooding has increased in recent years and is set to increase and subsequently more homes will inevitably be effected by mould contamination. The present study initially aimed to determine the types of fungi commonly detected in buildings in the United Kingdom with varied levels of water intrusion problems via a small survey using various sampling techniques and particularly aimed to determine the conditions by which growth of the toxigenic fungi Stachybotrys chartarum could occur. Penicillium, Cladosporium and Aspergillus species were the most commonly detected fungi in buildings with relatively moderate levels of water intrusion problems; Stacybotrys chartarum was only detected in building with more severe water intrusion problems. Cont/d
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