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91.
Nikolić Nebojša D. Živković Predrag M. Elezović Nevenka Lačnjevac Uroš 《Journal of Solid State Electrochemistry》2020,24(7):1615-1624
Journal of Solid State Electrochemistry - Formation of the honeycomb-like electrodes of copper by the regime of reversing current (RC) in the second range has been investigated. Morphological and... 相似文献
92.
Višnja Vrdoljak Prof. Dalibor Milić Marina Cindrić Dubravka Matković‐Čalogović Jana Pisk Marina Marković Predrag Novak 《无机化学与普通化学杂志》2009,635(8):1242-1248
New dinuclear pentacoordinate molybdenum(V) complexes, [Mo2VO3L2] [L = thiosemicarbazonato ligand: C6H4(O)CH:NN:C(S)NHR′ and C10H6(O)CH:NN:C(S)NHR′; R′ = H, CH3, C6H5) were obtained either by oxygen atom abstraction from MoVIO2L with triphenylphosphine or by using [Mo2O3(acac)4] in the reaction with the corresponding ligands H2L. Crystal and molecular structure of [Mo2O3{C6H4(O)CH:NN:C(S)NHC6H5}2] · CH3CN has been determined by the single‐crystal X‐ray diffraction method. 相似文献
93.
Stefan Stanimirovi Predrag Stanimirovi Marko Miladinovi Aleksandar Ili 《Applied mathematics and computation》2009,215(2):796-805
We introduce the notion of the Catalan matrix whose non-zero elements are expressions which contain the Catalan numbers arranged into a lower triangular Toeplitz matrix. Inverse of the Catalan matrix is derived. Correlations between the matrix and the generalized Pascal matrix are considered. Some combinatorial identities involving Catalan numbers, binomial coefficients and the generalized hypergeometric function are derived using these correlations. Moreover, an additional explicit representation of the Catalan number, as well as an explicit representation of the sum of the first m Catalan numbers are given. 相似文献
94.
Starting from algorithms introduced in [Ky M. Vu, An extension of the Faddeev’s algorithms, in: Proceedings of the IEEE Multi-conference on Systems and Control on September 3-5th, 2008, San Antonio, TX] which are applicable to one-variable regular polynomial matrices, we introduce two dual extensions of the Faddeev’s algorithm to one-variable rectangular or singular matrices. Corresponding algorithms for symbolic computing the Drazin and the Moore-Penrose inverse are introduced. These algorithms are alternative with respect to previous representations of the Moore-Penrose and the Drazin inverse of one-variable polynomial matrices based on the Leverrier-Faddeev’s algorithm. Complexity analysis is performed. Algorithms are implemented in the symbolic computational package MATHEMATICA and illustrative test examples are presented. 相似文献
95.
Systems such as fluid flows in channels and pipes or the complex Ginzburg–Landau system, defined over periodic domains, exhibit both continuous symmetries, translational and rotational, as well as discrete symmetries under spatial reflections or complex conjugation. The simplest, and very common symmetry of this type is the equivariance of the defining equations under the orthogonal group O(2). We formulate a novel symmetry reduction scheme for such systems by combining the method of slices with invariant polynomial methods, and show how it works by applying it to the Kuramoto–Sivashinsky system in one spatial dimension. As an example, we track a relative periodic orbit through a sequence of bifurcations to the onset of chaos. Within the symmetry-reduced state space we are able to compute and visualize the unstable manifolds of relative periodic orbits, their torus bifurcations, a transition to chaos via torus breakdown, and heteroclinic connections between various relative periodic orbits. It would be very hard to carry through such analysis in the full state space, without a symmetry reduction such as the one we present here. 相似文献
96.
Predrag Tanović 《Archive for Mathematical Logic》2007,46(5-6):517-527
We prove that a countable, complete, first-order theory with infinite dcl() and precisely three non-isomorphic countable models interprets a variant of Ehrenfeucht’s or Peretyatkin’s example. 相似文献
97.
The periodic orbit quantization on the anisotropic Kepler problem is tested. By computing the stability and action of some 2000 of the shortest periodic orbits, the eigenvalue spectrum of the anisotropic Kepler problem is calculated. The aim is to test the following claims for calculating the quantum spectrum of classically chaotic systems: (1) Curvature expansions of quantum mechanical zeta functions offer the best semiclassical estimates; (2) the real part of the cycle expansions of quantum mechanical zeta functions cut at appropriate cycle length offer the best estimates; (3) cycle expansions are superfluous; and (4) only a small subset of cycles (irreducible cycles) suffices for good estimates for the eigenvalues. No evidence is found to support any of the four claims. 相似文献
98.
99.
Ratko Pavlović Predrag Kozić Snežana Mitić Ivan Pavlović 《Archive of Applied Mechanics (Ingenieur Archiv)》2009,79(12):1163-1171
The stochastic stability problem of an elastic, balanced rotating shaft subjected to action of axial forces at the ends is
studied. The shaft is of circular cross-section, it rotates at a constant rate about its longitudinal axis of symmetry. The
effect of rotatory inertia of the shaft cross-section is included in the present formulation. Each force consists of a constant
part and a time-dependent stochastic function. Closed form analytical solutions are obtained for simply supported boundary
conditions. By using the direct Liapunov method almost sure asymptotic stability conditions are obtained as the function of
stochastic process variance, damping coefficient, damping ratio, angular velocity, mode number and geometric and physical
parameters of the shaft. Numerical calculations are performed for the Gaussian process with a zero mean and as well as an
harmonic process with random phase. 相似文献
100.
Assessment of radiation risk and radon exhalation rate for granite used in the construction industry
Kuzmanović Predrag Todorović Nataša Nikolov Jovana Hansman Jan Vraničar Andrej Knežević Jovana Miljević Bojan 《Journal of Radioanalytical and Nuclear Chemistry》2019,321(2):565-577
Journal of Radioanalytical and Nuclear Chemistry - The results of the gamma spectrometry analysis of the 40 samples of highly radioactive granites used in the construction industry in Serbia are... 相似文献