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161.
This issue of Mathematica Slovaca is in honour of Prof. Ján Jakubík’s 90th birthday. We present here a brief account of his research (to date) and a personal sketch of the gentleman. 相似文献
162.
This paper extends some properties of the generalized complementary basic matrices, in particular, in a combinatorial direction. These include inheritance (such as for Alternating Sign Matrices), spectral, and sign pattern matrix (including sign nonsingularity) properties. 相似文献
163.
Miroslav Petrović 《Graphs and Combinatorics》1999,15(2):221-232
In this paper, by means of computer checking, all simple graphs with at most two nonnegative eigenvalues, and all minimal simple graphs with exactly two (respectively, three) nonnegative eigenvalues are determined. Received: April 5, 1996 / Revised: May 2, 1997 相似文献
164.
The optimum conditions have been found for the formation of the ternary complexes of iron(III) with Chrome Azurol S (CAS), Eriochrome Cyanine R, and Pyrocatechol Violet in the presence of cetyltrimethylammonium (CTA), cetylpyridinium, or tetradecyldimethyl-benzylammonium ions. The pH range of the complex formation is limited mainly by the pertinent hydrolysis constants of the metal ions. The maximum absorbances were obtained for excess R and cationic surfactants, ensuring the formation of complexes with the highest R:Fe molar ratio. The method based on the Fe-CAS-CTA system (ε = 1.32 × 105 liter mol−1 cm−1 at 628 nm) is most sensitive and is recommended for the spectrophotometric determination of iron. 相似文献
165.
In this paper we prove that all positive eigenvalues of the Laplacian of an arbitrary simple graph have some positive lower bounds. For a fixed integer k 1 we call a graph without isolated vertices k-minimal if its kth greatest Laplacian eigenvalue reaches this lower bound. We describe all 1-minimal and 2-minimal graphs and we prove that for every k 3 the path Pk+1 on k + 1 vertices is the unique k-minimal graph. 相似文献
166.
Miroslav Jelinek Tomas Kocourek Josef Zemek Michal Novotný Jaromír Kadlec 《Applied Physics A: Materials Science & Processing》2008,93(3):633-637
Thin SiC
x
films were fabricated by hybrid laser–magnetron deposition system. KrF excimer laser was used for deposition of carbon and
magnetron at the same time for sputtering of Si species. Films were fabricated in argon/hydrogen ambient with and without
additional RF discharge. The substrate temperature was changed up to 700°C. Films topology, crystallinity, composition, chemical
bonds and optical emission spectra were studied. Films were smooth and amorphous. Films of thickness 400–1000 nm were fabricated.
Adhesion moved from 8 to 14 N, depending on deposition conditions. 相似文献
167.
Miroslav Voříšek 《Czechoslovak Journal of Physics》1955,5(1):89-90
168.
Miroslav Bartušek 《Mathematische Nachrichten》2010,283(6):805-817
This paper presents necessary and sufficient conditions for an n ‐th order differential equation to have a non‐continuable solution with finite limits of its derivatives up to the order l at the right‐hand end point of the interval of its definition, l ≤ n – 2 (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim) 相似文献
169.
Miroslav Englis 《Proceedings of the American Mathematical Society》1999,127(11):3259-3268
Let be a Cartan domain of rank and genus and , , the Berezin transform on ; the number can be interpreted as a certain invariant-mean-value of a function around . We show that a Lebesgue integrable function satisfying , , must be -harmonic. In a sense, this result is reminiscent of Delsarte's two-radius mean-value theorem for ordinary harmonic functions on the complex -space , but with the role of radius played by the quantity .
170.
Miroslav Petrović Ivan Gutman Mirko Lepović Bojana Milekić 《Linear and Multilinear Algebra》2013,61(3):205-215
All connected bipartite graphs with exactly two Laplacian eigenvalues greater than two are determined. Besides, all connected bipartite graphs with exactly one Laplacian eigenvalue greater than three are determined. 相似文献