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1.
Dijana Šimkūnaitė Emilija Ivaškevič Aleksandras Kaliničenko Antanas Steponavičius 《Journal of Solid State Electrochemistry》2006,10(7):447-457
The early stages of Cu electrodeposition onto Pt(poly) have been investigated in 0.5 M H2SO4 + 0.01 M CuSO4 solution without or with H2SeO3 when a molar concentration ratio [Cu(II)]/[Se(IV)] ≥ 2×102 using electrochemical and ex situ AFM techniques. The overpotential deposition of Cu has been performed onto a Pt surface precovered independently with Cu in amount close to an equivalent monolayer. Chronoamperometric results have been shown to follow an instantaneous 3D nucleation and diffusion-controlled growth model. The values of diffusion coefficient D for Cu2+, number of nuclei N and average nuclei radius r
av have been calculated. In the local regions of the surface, the separate large agglomerates composed of the different diameter clusters have been revealed in both cases, but, in the presence of the H2SeO3, they attained a distinct chain-like configuration. Some morphological characteristics have been reported. 相似文献
2.
We prove a limit theorem in the space of analytic functions for the Hurwitz zeta-function with algebraic irrational parameter. 相似文献
3.
Antanas Laurinčikas 《Siberian Mathematical Journal》2010,51(1):88-103
We prove limit theorems in the sense of weak convergence of probability measures on the complex plane as well as in the space
of analytic functions for the Mellin transform of {ie88-01} 相似文献
4.
The problem of multidimensional scaling with city-block distances in the embedding space is reduced to a two level optimization
problem consisting of a combinatorial problem at the upper level and a quadratic programming problem at the lower level. A
hybrid method is proposed combining randomized search for the upper level problem with a standard quadratic programming algorithm
for the lower level problem. Several algorithms for the combinatorial problem have been tested and an evolutionary global
search algorithm has been proved most suitable. An experimental code of the proposed hybrid multidimensional scaling algorithm
is developed and tested using several test problems of two- and three-dimensional scaling. 相似文献
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6.
Temperature dependence of electronic and ionic components of electric conductivity and dielectric permittivity of amorphic compounds Ag0.25Sb0.25S0.5, (AgSbS2)0.95· (SbSI)0.05 and (AgSbS2)0.9·(SbSI)0.1 in the temperature range of 290–380 K have been investigated. The experimental data show that glasses investigated are solid electrolytes. Ionic conductivity as well as dielectric permittivity of the glasses Ag-Sb-S may be changed by introduction of SbSI. 相似文献
7.
T. ?alkus E. Kazakevi?ius A. Ke?ionis V. Kazlauskien? J. Mi?kinis A. Dindune Z. Kanepe J. Ronis M. Dudek M. Bu?ko J. R. Dygas W. Bogusz A. F. Orliukas 《Ionics》2010,16(7):631-637
Li1.3Al0.15Y0.15Ti1.7(PO4)3 compound was synthesized by solid-state reaction, and ceramics were sintered. The surfaces of the ceramics were investigated by scanning electron microscopy and X-ray photoelectron spectroscopy. Li1.3Al0.15Y0.15Ti1.7(PO4)3 samples were tested in solid galvanic cells Ag|O2+CO2|Li2CO3|Li1.3Al0.15Y0.15Ti1.7(PO4)3|LiMnO2+Mn2O3|O2|Ag. The electromotive force measurements of this cell indicated that investigated samples are practically pure Li-ion conductors. Impedance spectroscopy studies have been performed in the frequency range 10?2–3·109 Hz and temperatures from ?57 °C to 334 °C. Three dispersion regions related to Li+ ionic transport in bulk, grain boundaries of the ceramics and to polarization of electrodes have been found. Total conductivity changes according to Arrhenius law in the studied temperature range, but an anomalous behavior was observed for the bulk conductivity of the ceramics. 相似文献
8.
Antanas Laurin?ikas 《Journal of Number Theory》2010,130(10):2323-2331
In 1975, S.M. Voronin proved the universality of the Riemann zeta-function ζ(s). This means that every non-vanishing analytic function can be approximated uniformly on compact subsets of the critical strip by shifts ζ(s+iτ). In the paper, we consider the functions F(ζ(s)) which are universal in the Voronin sense. 相似文献
9.
A hybrid global optimization algorithm is proposed aimed at the class of objective functions with properties typical of the problems of non-linear least squares regression. Three components of hybridization are considered: simplicial partition of the feasible region, indicating and excluding vicinities of the main local minimizers from global search, and computing the indicated local minima by means of an efficient local descent algorithm. The performance of the algorithm is tested using a collection of non-linear least squares problems evaluated by other authors as difficult global optimization problems. 相似文献
10.
The Ramanujan Journal - We use the elliptic regulator to prove an identity between the Mahler measures of a genus 3 polynomial family and of a genus 1 polynomial family that was initially... 相似文献