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  Тип елементу:Документ,

  Metrological aspects of pipe corrosion resistance estimation in the electric power installation.

  Kuznetsov, E.D.

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  Chigirinets, E.E.

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  Кузнєцов, Є.Д.

  (Металожурнал, 2011)

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  The potential metrology errors that appear when estimating the state of corrosion-resistant pipe surface, namely roughness, indices of general and pitting corrosion are analyzed. It is shown that for determination of technological manufacturability of high-duty pipes with enhanced corrosion resistance it is necessary to follow the possibilities of surface microrelief 3D - analysis. It will enable to describe the surface in the initial state and in the process of service as well as to work out methods to remove disadvantages. © Metallurgical and Mining Industry, 2011.

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  Тип елементу:Документ,

  Separation of diluted fine-disperse water-oil emulsions by ultraflocculation and floatation

  Rulyov, N.N.

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  Korolev, V.Y.

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  Zubkova, V.A.

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  Luk’yanova, V.V.

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  Лук'янова , В.В.

  (Springer, 2010)

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  Using a fine-disperse emulsion of sunflower oil in water stabilized by sodium dodecyl sulfate it has been shown that ultraflocculation combined with floatation is an effective means of separation of stabilized phases of water-oil emulsions whose complete treatment time may constitute < 0.5 min, while the residual concentration of oil in water < 30 mg/dm3; an increase of the medium gradient velocity in the course of flocculation within the range 500-900 s-1 is accompanied by a monotonic decrease of the residual concentration of oil in the water, which makes it possible to effectively separate diluted water-oil emulsions; an increase of the medium velocity gradient in a flocculator to 104 s-1 makes it possible to decrease the time of ultraflocculation treatment to several seconds. © 2010 Allerton Press, Inc.

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  Тип елементу:Документ,

  On Quality of Approximation by Families of Generalized Sampling Series.

  Burinska, Z.

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  Runovski, K.

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  Schmeisser, HJ.

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  Бурінська, З.

  (SAMPLING PUBLISHING, 2009)

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  The quality of approximation by families of generalized sampling series in the scale of the Lp(Rd)-spaces with 0 < p ≤ +∞ is studied in terms of realizations of generalized K-functionals related to operators of multiplier type generated by homogeneous functions. The results are formulated in terms of generators of the method and of smoothness. The applications of the general scheme to methods generated by classical kernels as well as some new constructions to describe the smoothness of odd orders in terms of approximation are given. © 2009 SAMPLING PUBLISHING.

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  Тип елементу:Документ,

  Use of the Method of Images in Studying the Energy Spectra of the Surface States of Electrons or Holes in Three-layer Semiconductor–Dielectric–Conductor Structures

  Kislukha, N.I.

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  Tulchynska, D.M.

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  Тульчинська, Дар'я Миколаївна

  (Інститут теоретичної фізики імені М. М. Боголюбова, 2009)

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  For the potentials obtained by the method of images, we have found the surface states of an electron or a hole in three layer semiconductor-dielectric-conductor structures. For the arbitrarily thin layer of a dielectric, we deduced the exact formulas for the energy spectra En by the method of effective mass (En ~ 1/n2) and with regard for the discreteness of the crystal lattice of a semiconductor (En ~ √A + 1/n2). The surface states of an electron or a hole can be formed also in the two-layer semiconductor-dielectric structures in the cases where the permittivity of a dielectric is greater than that of a semiconductor. The obtained earlier exact solutions are applicable in this case as well. Other versions of the application of the method of images are discussed.

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  Тип елементу:Документ,

  On an Application of the Lax-Phillips Scattering Approach in the Theory of Singular Perturbations.

  Kuzhel' , S.O.

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  Matsyuk L.V. , L.V.

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  Мацюк, Леся Василівна

  (Springer Nature; Інститут математики НАН України, 2005)

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  For a singular perturbation A = A 0 + ∑ i, j = 1 n t ij 〈ψ j, ·〈 ψ i, n ≤ ∞, of a positive self-adjoint operator A 0 with Lebesgue spectrum, the spectral analysis of the corresponding self-adjoint operator realizations A T is carried out and the scattering matrix G-fraktur sing (AT, A0)(δ) is calculated in terms of parameters t ij under some additional restrictions on singular elements ψ j. The results obtained enable one to apply the Lax-Phillips approach in scattering theory. © 2005 Springer Science+Business Media, Inc.

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