1,787 research outputs found
Icosahedron designs
It is known from the work of Adams and Bryant that icosahedron designs of order v exist for v ≡ 1 (mod 60) as well as for v = 16. Here we prove that icosahedron designs exist if and only if v ≡ 1, 16, 21 or 36 (mod 60), wit
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Designs for graphs with six vertices and nine edges
The design spectrum has been determined for eleven of the 21 graphs with six vertices and nine edges. In this paper we completely solve the design spectrum problem for the remaining ten graphs
Minimum Weight Flat Antichains of Subsets
Building on classical theorems of Sperner and Kruskal-Katona, we investigate
antichains in the Boolean lattice of all subsets of
, where is flat, meaning that it contains
sets of at most two consecutive sizes, say , where contains only -subsets,
while contains only -subsets. Moreover, we assume
consists of the first -subsets in squashed
(colexicographic) order, while consists of all -subsets
not contained in the subsets in . Given reals , we
say the weight of is
. We characterize the minimum
weight antichains for any given , and we do the
same when in addition is a maximal antichain. We can then derive
asymptotic results on both the minimum size and the minimum Lubell function
Supporting Paralympic wheelchair sport performance through technological, physiological and environmental considerations
This is an Accepted Manuscript of an article published by Taylor & Francis in Annals of Human Biology on 25 Sep 2016, available online: http://www.tandfonline.com/10.1080/03014460.2016.1234644
Who are the next entrepreneurs?
Identifying potential entrepreneurs is important for governments trying to increase the number of small, flexible, job-creating domestic business. Academic research into the personality tendencies of actual and potential entrepreneurs has generated confusing and contradictory results. Current work stresses that motivation, learnable and non-learnable characteristics, might all distinguish future entrepreneurs from the general population. In this study, survey data on the motivation, demographics and learnable characteristics of business students in Malaysia and the United States were used to seek answers to the following questions 1) Do entrepreneurs differ from the general population? 2) Do actual entrepreneurs differ from potential entrepreneurs? and 3) Do entrepreneurs differ across cultures? The results indicate that it is possible to differentiate entrepreneurs from the general public, that actual and potential entrepreneurs do differ and that American and Malaysian entrepreneurs are different
Spontaneous thermal runaway as an ultimate failure mechanism of materials
The first theoretical estimate of the shear strength of a perfect crystal was
given by Frenkel [Z. Phys. 37, 572 (1926)]. He assumed that as slip occurred,
two rigid atomic rows in the crystal would move over each other along a slip
plane. Based on this simple model, Frenkel derived the ultimate shear strength
to be about one tenth of the shear modulus. Here we present a theoretical study
showing that catastrophic material failure may occur below Frenkel's ultimate
limit as a result of thermal runaway. We demonstrate that the condition for
thermal runaway to occur is controlled by only two dimensionless variables and,
based on the thermal runaway failure mechanism, we calculate the maximum shear
strength of viscoelastic materials. Moreover, during the thermal
runaway process, the magnitude of strain and temperature progressively localize
in space producing a narrow region of highly deformed material, i.e. a shear
band. We then demonstrate the relevance of this new concept for material
failure known to occur at scales ranging from nanometers to kilometers.Comment: 4 pages, 3 figures. Eq. (6) and Fig. 2a corrected; added references;
improved quality of figure
Hay Quality Sensory Evaluation Form - Timothy; Export & Horse
Hay Quality Sensory Evaluation Form – Timothy; Export & Hors
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