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(17/04) Курс “Анализ геномных данных”, Москва, 2 – 11 июля 2012
Уважаемые коллеги, Со 2 по 11 июля 2012 года Учебный центр Института биологии гена РАН организует практический десятидневный курс по статистическому анализу геномных дан...
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(12/03) Впервые получено изображение атомов, движущихся в молекуле
Исследователи из Университетов Огайо и Канзаса впервые смогли получить изображения атомов, движущихся в молекуле. С помощью ультрабыстрого лазера исследователи выбивали элек...
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(12/03) Наблюдение за распределением зарядов в молекуле
Исследователи из Швейцарии впервые с помощью экспериментов смогли визуализировать распределение зарядов отдельной молекуле. Предполагается, что результаты работы могут при...
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(22/01) Простой способ разделения углеродных нанотрубок
Существуют одностенные углеродные нанотрубки [single-walled carbon nanotubes (SWCNT)] с металлическим и полупроводниковым типом проводимости, однако для использования этих...
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Результаты 1 - 10 из 17
1.

The Aftereffect of Cyclic Loading on the Corrosion of Aluminum-Based Alloys

V. Yu. Vasil’eva, V. S. Shapkinb, N. V. Barulenkovaa, M. V. Antonovab, and E. N. Antonovaa

 

a Moscow Institute of Steel and Alloys, Leninskii pr. 4, Moscow, 119991 Russia

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b State Research Institute of Civil Aviation, Moscow, Russia

Received June 25, 2005

 

Abstract — Effects of bench loading and stresses on the corrosion resistance of frame016frame1frame2 alloy are studied. Complicated effect of the stress intensity and the cyclic loading on the surface morphology and pit concentration is demonstrated. Harmonic character of the loading dependence of the change of corrosion resistance is due to segregation effects.

DOI: 10.1134/S0033173206030015
18/09/2008 | 808 Посещения | Печать

2.

On Inhibition of Hydrogen-Sulfide Corrosion of Steels with Quaternary Ammonium Salts

Yu. I. Kuznetsov, L. V. Frolova, and E. V. Tomina

 

Institute of Physical Chemistry, Russian Academy of Sciences,
Leninskii pr. 31, Moscow, 119991 Russia

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Received August 7, 2005

 

Abstract — The corrosion and electrochemical behavior of carbon steels in standard 0.5% chloride electrolytes acidified with CH3COOH and saturated with H2S was studied. The possibility of protecting steels with quaternary ammonium salts (QASs) obtained by reactions of secondary and tertiary amines with benzyl chloride was investigated. It was found that the protective properties of QASs depend on their chemical structures and can be expressed, to a first approximation, in terms of the Linear Gibbs Energy Relation with the use of the hydrophobic f constants and Taft *-constants of the substituents. The presence of hydrophobic and electron-accepting substituents was found to enhance the protective properties of the inhibitors.

DOI: 10.1134/S0033173206030027
18/09/2008 | 866 Посещения | Печать

3.

A New Theoretical Approach to the Thermodynamic Calculation of High-Temperature Oxidation of Niframe0Cr Alloys

Yu. Ya. Andreev and A. A. Shumkin

 

Moscow State Institute of Steel and Alloys, Leninskii pr. 4, Moscow, 117936 Russia

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Received April 12, 2005

 

Abstract — In calculations, not only the Gibbs formation energy of nickel and chromium oxides and thermodynamic activities of the alloy components, but also the Gibbs surface energy of a Ni–Cr alloy is taken into account. The method is based on the adsorption model of the alloy oxidation, according to which the adsorption of an alloy component with the smaller surface energy, namely, nickel, at the alloy–oxide film interface bound-ary shifts the dynamic equilibrium between the alloy and oxide-film components toward the formation of NiO. For the oxidation of Ni–Cr alloys, which are solid solutions with an fcc lattice, at 1123 to 1473 K, concentration boundaries of the chromium content in the alloy are calculated for the case of the prevailing formation of Cr2O3 oxide, which determines the high heat resistance of Ni–Cr alloys.

DOI: 10.1134/S0033173206030039
18/09/2008 | 834 Посещения | Печать

4.

Tunnel Scanning Microscopy and Spectroscopy in Studying Feframe0Cr Stainless Steels1

E. V. Trofimova, E. V. Kasatkin, and I. I. Reformatskaya

 

Karpov Institute of Physical Chemistry, ul. Vorontsovo pole 10, Moscow, 105064 Russia

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Received June 28, 2005

 

Abstract — Scanning tunnel microscopy (STM) and scanning tunnel spectroscopy (STS) are used in studying highly pure iron and chromium and Fe–x%Cr (2.4< equal x < equal60 wt %) alloys at the air boundary, as well as some of the alloys in 0.01 N H2SO4 . The obtained probability coefficients () of the electron tunnel transfer from a specimen to the needle and the slopes () of the logarithmic Ut/frame2It) dependences as functions of the chromium content in Fe–Cr alloys confirm the critical compositions of the alloys containing ~6.5 and 10–13% chro-mium, which is in accord with the results of the steady-state and transient electrochemical measurements. A correlation between these critical compositions of the alloys and sharp changes in the histograms of and values is observed. Pronounced extreme properties of the Fe–25.2% Cr alloy surface, which corresponds to the inclusion of Cr atoms in tetrahedral voids of the alloy crystal lattice, are noticed.

 

DOI: 10.1134/S0033173206030040
18/09/2008 | 835 Посещения | Печать

5.

Soil Corrosion of Differential Aeration Cells and Conditions of Their Operation

N. N. Glazov, S. M. Ukhlovtsev, I. I. Reformatskaya, A. N. Podobaev, and I. I. Ashcheulova

 

FGUP GNTs RF Karpov Institute of Physical Chemistry,
ul. Vorontsovo pole 10, Moscow, 105064 Russia

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Received March 18, 2005

 

Abstract — Potentials stabilized at the anode and cathode of a differential aeration cell (DAC) under free corrosion conditions, electric contact, and cathodic polarization are analyzed. It is shown that the soil conductivity limits the possibility of cathodic protection. The shallow pit formation at the cathode and pitting at the anode are the main corrosion types in the half-cells. The rate of development of local corrosion centers on the surfaces of both half-cells is virtually independent of the conditions of DAC operation.

DOI: 10.1134/S0033173206030052
18/09/2008 | 887 Посещения | Печать

6.

Chemical Modification of the Surface of a Carbonyl Iron Powder

S. G. Belyavskiia, P. G. Mingalyova, F. Giulierib, R. Combarrieaub, and G. V. Lisichkina

 

a Department of Chemistry, Lomonosov Moscow State University,
Vorob’evy gory, Moscow, 119992 Russia

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b University of Nice, Nice, France

Received December 21, 2004

 

Abstract — The surface of a carbonyl iron powder was chemically modified with functional triethoxysilanes and ethyl n-alkylphosphonates. The grafted layers were examined by x-ray photoelectron spectroscopy and conductivity measurements.

 

DOI: 10.1134/S0033173206030064
18/09/2008 | 856 Посещения | Печать

7.

Effect of Cyclic Benzo-12-Crown-4 Polyether on Copper Electrodeposition from Sulfate Aqueous Ethanol Baths

V. V. Kuznetsov, L. M. Skibina, and S. V. Geshel’

 

Rostov State University, ul. Zorge 7, Rostov-on-Don, 344090 Russia

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Received February 15, 2005

 

Abstract — It is found that the effectiveness of crown ether (with benzo-12-crown-4 as an example) is a function of the composition of the water–ethanol solvent and the bulk and surface concentration of sulfate anions. An increase in the adsorbability of sulfate anions at Cu in the presence of the crown ether ('-effect) enhances its inhibitive effect on copper electrodeposition. The electrode reaction is best inhibited, and electroplates with enhanced tribotechnical characteristics are obtained, in the zone of ethanol structure stabilization, in which the adsorption of frame0 anions by copper is the highest because of the “desalting” effect.

 

DOI: 10.1134/S0033173206030076
18/09/2008 | 808 Посещения | Печать

8.

Peculiarities of Electrochemical Behavior of Copper in Alkaline Solutions in the Presence of Alanine

E. V. Nikitchenkoa, S. A. Kaluzhinaa, and N. P. Andreevab

 

aVoronezh State University, Universitetskaya pl. 1, Voronezh, 394006 Russia

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bFrumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences,
Leninskii pr. 31, Moscow, 119991 Russia

Received February 28, 2005

 

Abstract — Anodic oxidation of copper in alkaline solution in the presence of alanine is studied by electrochemical and ellipsometric methods. Thickness of films formed on the metal in the working solutions, are determined. Small additives of -alanine (10–4–10–3 mol/l) cause additional stabilization of copper passivity due to an increase in the film thickness. The adsorption kinetics of - and -alanine is studied. It is shown experimentally that -alanine adsorbs on copper according to the Frumkin isotherm. By contrast, no definite type isotherm can be obtained for -alanine due to its higher activity and ability to form soluble complexes with copper ions.

DOI: 10.1134/S0033173206030088
18/09/2008 | 908 Посещения | Печать

9.

Certain Characteristics of Zirconium-Containing Anodic Films on Aluminum

K. N. Kilin, V. S. Rudnev, P. M. Nedozorov, and T. P. Yarovaya

 

Institute of Chemistry, Far East Division, Russian Academy of Sciences,
pr. Stoletiya Vladivostoka 159, Vladivostok, 690022 Russia

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Received May 20, 2005

 

Abstract — Some data on zirconium-containing layers plasma-electrochemically (P-E) applied to A7 aluminum alloy (obtained by using x-ray spectral and diffraction analyses, electron microscopy, as well as measuring their thickness and visible light reflection) are discussed. The properties of the P-E applied structures formed under power-drop conditions are studied as functions of the potassium hexafluorozirconate bath temperature (20–70°C) and initial voltage (300–500 V).

DOI: 10.1134/S003317320603009X
18/09/2008 | 870 Посещения | Печать

10.

Comparison Analysis of Formation and Some Characteristics of Microplasma Coatings on Aluminum and Titanium Alloys

O. P. Terleevaa, V. I. Belevantseva, A. I. Slonovaa, D. L. Bogutab, and V. S. Rudnevb

 

a Institute of Inorganic Chemistry, Siberian Division, Russian Academy of Sciences,
pr. Akademika Lavrent’eva 3, Novosibirsk, 630090 Russia

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b Institute of Chemistry, Far East Division, Russian Academy of Sciences,
pr. Stoletiya Vladivostoka 159, Vladivostok, 690022 Russia

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Received November 23, 2004

 

Abstract — The electrolyte and parameters of high-voltage anodic–cathodic process, which enable one to apply rather thick (to 340 µm) oxide coatings to titanium alloys, are selected. Characteristics of the coating formation on aluminum and titanium alloys are compared. It is found that, on the titanium alloys, the stage of microarc discharges occurs only at relatively high anodic and cathodic components of the current density. The voltage chronograms and oscillograms also have pronounced specific features.

 

DOI: 10.1134/S0033173206030106
18/09/2008 | 953 Посещения | Печать

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