Výsledky vyhledávání - "A I, Lavrent'ev"

Per(γ-trifluoropropyl)octasilsesquioxane

Autor: V. I. Lavrent’ev

Publikováno v: Russian Journal of General Chemistry. 74:1188-1193

Per(γ-trifluoropropyl)octasilsesquioxane was prepared by hydrolytic polycondensation of γ-trifluoropropyltrichlorosilane in dilute solutions in various organic solvents. The mechanism of formation of the silsesquioxane core in the course of polycon

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f1bafcc5b5432f63bfbfee9630ffe6ee
https://doi.org/10.1007/s11176-005-0136-y

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Observation of carbon segregation and evolution of vacancy defects in a surface layer of iron exposed to a low-energy high-current electron beam

Autor: N. A. Pogrebnyak, Yu. V. Tsvintarnaya, R. Shandrik, Antonio Zecca, A. D. Mikhalev, V. I. Lavrent'ev, A. D. Pogrebnyak

Publikováno v: CIÊNCIAVITAE
Scopus-Elsevier

For the first time, Rutherford backscattering (RBS) and proton-induced x-ray emission (PIXE) using a proton microbeam and a slow positron beam were used to analyze (scan) the surface and near-surface layers of α-Fe after exposure to a low-energy hig

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f5eff905447b558f55613b88045ce46a
https://doi.org/10.1134/1.1262112

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Near-ordering structural transitions in amorphous metal alloys

Autor: V. I. Lavrent’ev

Publikováno v: Physics of the Solid State. 40:354-357

The temperature variations in the modulus of elasticity (Young’s modulus) E and internal friction Q−1 of the amorphous metal alloys Ti50Cu50−xNix (5⩽x⩽20) are studied at temperatures of 300–800 K. There is an anomalous increase in E(T) at

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::15f60cf8b2e613a553983f9cc02b75ea
https://doi.org/10.1134/1.1130325

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Local surface segregations of implanted aluminum in an iron crystal with a low density of defects

Autor: R. Sandrik, A. D. Pogrebnyak, V. I. Lavrent’ev

Publikováno v: Journal of Experimental and Theoretical Physics Letters. 65:91-94

The surface distribution of elements is studied by scanning a 3-MeV proton beam along the surface of a bcc-Fe sample implanted with aluminum ions in the dose interval (1–50) · 1016 cm−2. Ring-shaped regions, up to 30 μm in diameter, with a high

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::330f12990c7539cb74b783e4fb7be294
https://doi.org/10.1134/1.567331

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Change of the dynamic modulus of elasticity as criterion of the state of oxidation of boron fibers

Autor: V. I. Lavrent'ev

Publikováno v: Soviet Powder Metallurgy and Metal Ceramics. 29:934-937

At 723 K, which obviously is the melting point of the oxide B2O3, the mechanism of growth of the oxide on BF changes. Below 723 K the activation energy of growth of oxide is equal to 1.0; above 723 K it is equal to 1.7 eV.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f0bd4ef4b822d053b6d360e724c922a4
https://doi.org/10.1007/bf00794033

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[Restructuring of the spatial organization of circular DNA molecules in liquid crystal dispersions]

Autor: V I, Salianov, P I, Lavrent'ev, B A, Chernukha, Iu M, Evdokimov

Publikováno v: Molekuliarnaia biologiia. 28(6)

The change in the spatial structure of superhelical and nicked DNA molecules in liquid-crystalline dispersions under micrococcal nuclease treatment was studied. Micrococcal nuclease digestion leads to restructuring from the "nonspecific" packing of c

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=pmid________::aeb7b8579a23f0c196db5b5c2db18853
https://pubmed.ncbi.nlm.nih.gov/7885329

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Effect of working pressure on the layer-by-layer failure of multilayer metallic bellows

Autor: Yu. M. Sorokin, V. P. Galai, M. I. Kabel'skii, A. I. Lavrent'ev

Publikováno v: Chemical and Petroleum Engineering. 15:336-339

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::0bf506a908a9e941287e1cb2f718c819
https://doi.org/10.1007/bf01155701

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Effect of contact friction on the results of hardness determination by indentation and scratching

Autor: A. I. Lavrent'ev

Publikováno v: Strength of Materials. 6:613-616

1. The effect of friction on the results of calculating hardness using indentation is insignificant. 2. Whereas in indentation within the limits of actual friction coefficient values (0.1–0.7) the deviations do not exceed 15%, in the case of scratc

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https://doi.org/10.1007/bf01552409

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Socialist competition in the I. I. Lipse ?Labor Banner? Leningrad Fittings Production Association

Autor: A. I. Lavrent'ev, K. K. Zheltakov

Publikováno v: Chemical and Petroleum Engineering. 15:816-820

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::7a4e17a120e132220e13b02967c05faa
https://doi.org/10.1007/bf01178802

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Relationship of abrasive wear resistance to the physicomechanical properties of materials

Autor: A. I. Lavrent'ev

Publikováno v: Strength of Materials. 10:1366-1370

1. The abrasive wear resistance of metals is related linearally to the deformation component of the work of friction multiplied by the ratio of hardness to the coefficient of friction in wear. 2. To reveal a single relationship of the wear resistance

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c1b6d32ca60d43d9ffdcabc40bd5f215
https://doi.org/10.1007/bf01529680

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