Báo cáo toán học: "Jamming and geometric representations of graphs" ppsx

... overall picture of term variations is obtained by combining the 64 types of morphological relations, the two types of semantic relations and the three types of syntactic variations (and their sub-types). ... relatively poor precision of hybrid variations, the average precision of term conflation is high because hybrid variations only represent a small fraction of t...

Ngày tải lên: 31/03/2014, 04:20

... EXPRESS Open Access Structural and optical properties of ZnS thin films deposited by RF magnetron sputtering Dong Hyun Hwang 1 , Jung Hoon Ahn 1 , Kwun Nam Hui 1 , Kwan San Hui 2 and Young Guk Son 1* Abstract Zinc ... Hwang et al.: Structural and optical properties of ZnS thin films deposited by RF magnetron sputtering. Nanoscale Research Lett...

Ngày tải lên: 20/06/2014, 21:20

... 7:31 http://www.nanoscalereslett.com/content/7/1/31 Page 5 of 5 ORIGINAL PAPER Open Access Structure and electrical properties of sputtered TiO 2 /ZrO 2 bilayer composite dielectrics upon annealing in nitrogen Ming Dong 1 , Hao Wang 2* , ... 95:032905. doi:10.1186/1556-276X-7-31 Cite this article as: Dong et al.: Structure and electrical properties of spu...

Ngày tải lên: 20/06/2014, 21:20

... ϕ −1 are order- preserving. It is clear that if both X and Y are chains and ϕ : X → Y is an order- preserving bijection, then ϕ is an order -isomorphism. We say that X and Y are order- isomorphic if ... interesting isomorphism theorem as follows: For posets X and Y , OT (X) ∼ = OT (Y ) if and only if X and Y are order- isomorphic or anti- order- isomorphic. Let Z and...

Ngày tải lên: 06/08/2014, 05:20

... sequences. Although only known tech- niques [G] are used, these are sophisticated, and the problem serves as a useful study of these techniques, and the algebraic analysis gives partial information about ... have all n non-terminal symbols, we give a combinatorial interpretation for the transformation L (r) w . After the application of L (r) w to A, the last step is the placement of...

Ngày tải lên: 07/08/2014, 06:20

... positive graphic lists are the 0 -protographic lists, and the protographic lists are the 1 -protographic lists. As might be expected, every s -protographic list is also (s + 1) -protographic. This follows ... lists Y such that the merger X ∪ Y is not graphic, where the merger of two lists is obtained by summing the multiplicities of their elements. More generally, define...

Ngày tải lên: 07/08/2014, 08:20

... sides of a flat face of G  . Proof. This is a corollary of Lemma 9. The notion of the pseudo–embedding may be extended to the representations of a graph on the sphere and to the proper toroidal representations. ... G 1 and G 2 in the embedding of G. G 1 is completely embedded in one of the faces of G 2 and vice versa, which is not possible by convexity of faces and...

Ngày tải lên: 07/08/2014, 13:21

... W. Wang and K W. Lih, Choosability, edge choosability, and total choosability of outerplane graphs, European J. Combin 22 (2001), 71–78. [10] D. R. Woodall, A short proof of a theorem of Dirac’s ... vertices of degree 2, by Theorem 1.3. This contradiction completes the proof of Theorem 1.2. ✷ the electronic journal of combinatorics 13 (2006), #R98 6 Edge and total...

Ngày tải lên: 07/08/2014, 13:21

... loops. The edge set and the vertex set of G is denoted by V (G) and E(G) respectively. For a vertex v of G, the degree, d(v), of v in G is the number of edges incident with v. The set N v of all ... the edges of G may be coloured so that no two adjacent edges receive the same colour. A triangle in G is a set of three mutually adjacent vertices in G, and the edges of a...

Ngày tải lên: 07/08/2014, 15:22

... distribu- tions of the number of edges in a random dissection and in a random outerplanar graph, respectively. Proof of Theorem 1.4. The limit distribution of the number of edges in a two-connected unlabeled ... the unique embedding of two-connected components of outerplanar the electronic journal of combinatorics 14 (2007), #R66 21 Enumeration and asymptotic pro...

Ngày tải lên: 07/08/2014, 15:23

... Conclusions The bark anatomy of P. pinea L. is similar to that of P. pinaster and other Pinus spp. The secondary phloem of P. pinea has sieve cells and axial and radial parenchy- ma, ... description of P. pinaster bark anatomy and chemical composition has recently been published [9]. In this paper we describe the anatomy and ch...

Ngày tải lên: 08/08/2014, 14:21

... stored and unstored 2+0 Douglas fir seedlings of varying root volumes, For. Sci. 39 (1993) 275-294. [14] Hermann R.K., Seasonal variation in sensitivity of Douglas fir seedlings ... RMC and ψ wp ) and the field perfor- mance, in terms of survival and growth 1 year after planting, under two very different water regimes (we...

Ngày tải lên: 08/08/2014, 14:21

... different rooting strategies which are expressed in the architectures of the coarse root systems. Table II. Fractal analysis of the whole coarse root systems of four co-occurring species (3D). species ... 40, 29], to rhizomatous systems [40] and to root systems of several plant species. Berntson [2] gives a review of the attempts to determine fractal di...

Ngày tải lên: 08/08/2014, 14:22

... completes the proof of Theorem 2. 4 Automated Proofs 4.1 Proof of Theorem 1 Since the summands on the left and right sides of equation (1) va nish outside the intervals [0, m] and [0, n], the ... generatingfunctionology and the the Wilf-Zeilberger (WZ) method. Enumerative combinatorics deals with counting the number of certain combinatorial objects. It gives meaning and...

Ngày tải lên: 08/08/2014, 14:23

... The accuracy of the stereotactic treatment will among other factors depend on the reproducibility of the stereotactic frame and the positioning of the patient. It is necessary that the frame and the patient ... 0.7 mm for the GTC [12]. In the case of the Fixster system there is no study that has investigated the accuracy of the frame regardi...

Ngày tải lên: 09/08/2014, 09:22