By Emil Kolev, Peter Boyvalenkov, Nikolai Nikolov, Oleg Mushkarov, Mircea Lascu

ISBN-10: 9739417868

ISBN-13: 9789739417860

This ebook includes difficulties from all choice assessments from BMO and IMO. many of the difficulties are considered as tricky IMO sort problems.
The booklet is meant for undergraduates, highschool scholars and academics who're drawn to olympiad arithmetic.

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Extra resources for Bulgarian mathematical competitions 2003 - 2006

Sample text

4). Figure 6 illustrates the arrangement or structures of the 40 lamellar molecules within a sphere. e. coalesced but still fluid mesophase) and eventually the semi-coke (hardened mesophase) adopts a quite complex arrangement of lamellae. The structure of coalesced mesophase possesses defects which are known as "disclinations" (24, 29). These are low energy defects some of which anneal out during the transformation of coalesced bulk but fluid mesophase to the stage of semi-coke (hardened mesophase).

II I,' I, "11 I, I II I I I I I I , I I ~ ~ c-axis al Figure 2. 13 ~ a3 The hexagonal structure of graphite. Later, in 1942 Lipson and Stokes (8) observed lines in X-ray diffractograms which could not be assigned to the hexagonal lattice. e. to rhombohedral graphite. This latter form of graphite is thermodynamically less stable than hexagonal graphite (9) and reverts to hexagonal graphite on heat treatment to between 1500 0 and 3000 0 c (10). 1 Defects in Hexagonal Graphite Single crystal graphite, of high quality, is very rare.

52. 53. 54. 55. 56. 57. 58. 59. 60. 61. 62. 63. , H. Marsh, C. T. Kelly, Chemistry and Physics of Carbon, Ed. A. , 19, 211 (1984). , D. Crawford and H. Marsh, J. App1. , ~, 415 (1975) . Crawford D. and H. Marsh, Fuel, 55, 251 (1976). Crawford D. and H. Marsh, J. Microscopy, 109, 145 (1977). Marsh H. and D. Crawford, Carbon, 22, 413-(1984). , M. Oberlin, A. Oberlin and P. Hyvernat, Carbon, ~, 337 (1980). R. A. Jefferson, Chemistry and Physics of Carbon, Eds. L. Walker Jr. A. , 14, 1 (1978). S. D.

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Bulgarian mathematical competitions 2003 - 2006 by Emil Kolev, Peter Boyvalenkov, Nikolai Nikolov, Oleg Mushkarov, Mircea Lascu

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