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L. V. Krylov Yu. N. Melent'ev V. I. Yatsenko V. V. Nikitin L. V. Maksimova I. N. Knyazeva 《Metallurgist》1991,35(2):32-32
Magnitogorsk Metallurgical Combine. Translated from Metallurg, No. 2, p. 37, February, 1991. 相似文献
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T. A. Chernyshova M. A. Milyaev L. I. Naumova V. V. Proglyado I. K. Maksimova A. Yu. Pavlova D. V. Blagodatkov V. V. Ustinov 《The Physics of Metals and Metallography》2017,118(12):1203-1208
Spin valves that comprise synthetic antiferromagnet as a component of pinned layer and an exchange-coupled ferromagnet/Ru/ferromagnet structure in the free layer have been prepared by magnetron sputtering. Microobjects have been formed from spin valves by optical and electron-beam lithography. It has been shown that the shift of the low-field magnetoresistance hysteresis loop decreases as the thicknes of the Ru spacer in the free layer of spin valve increases. The almost hysteresis-free odd-field dependences of the magnetoresistance were obtained for micron-sized samples; in this case, the sensitivity is 0.2%/Oe. 相似文献
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FA Amosenko VV Surkov TI Tikhonenko TS Maksimova 《Canadian Metallurgical Quarterly》1976,26(3):361-366
Progressive systemic sclerosis may be associated with focal myocardial fibrosis. Electrocardiographic abnormalities including conduction block are common in progressive systemic sclerosis but whether they are due to direct destruction of the specialized conduction tissue of the heart is uncertain. The conduction systems of 35 patients with progressive systemic sclerosis were studied. Of these 35 patients, 17 (50 per cent) had myocardial fibrosis of the type seen in progressive systemic sclerosis. In 10 of the 17, it was severe. Sinus node fibrosis was present in 13 patients and was nearly as frequent in those with as in those without the progressive systemic sclerosis myocardial lesion. Overlying pericarditis may have contributed to the fibrotic changes within the sinoatrial nodes in seven of the 13 patients. The atrioventricular node and main His bundles were normal. However, fibrotic changes were found in the proximal bundle systems in six patients. In three of the six, severe myocardial progressive systemic sclerosis was present, two had focal fibrous atrophy of the left bundle, and one had complete interruption of the right bundle. In only the latter patient was this reflected in the electrocardiogram which showed a right bundle branch block. Three patients without progressive systemic sclerosis myocardial lesions also had fibrous atrophy of a portion of the proximal left bundle branch, and in one the electrocardiogram showed an isolated left anterior hemiblock. Thus, morphologic abnormalities within the conduction system in our patients are difficult to attribute to progressive systemic sclerosis per se. Furthermore, although conduction abnormalities were more frequent in patients with myocardial disease, specific conduction system disease was not the cause in most patients. As has been noted in ischemic heart disease, the conduction system appears to be relatively spared from the myocardial changes of progressive systemic sclerosis, and the high incidence of conduction disturbances in this condition may be a consequence, rather, of damage to working myocardium. 相似文献
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N. E. Sorokina N. V. Maksimova A. V. Nikitin O. N. Shornikova V. V. Avdeev 《Inorganic Materials》2001,37(6):584-590
The highly oriented pyrolytic graphite–HNO3–H3PO4system was studied by x-ray diffraction and potentiometry at different acid concentrations. The results demonstrate that chemical and electrochemical intercalation in the graphite–98% HNO3–85% H3PO4system yields graphite nitrate, a binary graphite intercalation compound (GIC). H3PO4is shown to have an ambiguous effect on the concentration ranges of different stages of graphite nitrate, shifting them to lower HNO3concentrations as compared to the graphite–HNO3–H2O system. In the graphite–98% HNO3–100% H3PO4system, a stage II ternary GIC is obtained, with an intercalate layer thickness d
i 4.7 Å. Stages II–VI of this GIC were prepared via exchange reaction between graphite nitrate and 100% H3PO4. A mechanism for the formation of the ternary GIC is proposed. The synthesis of the cointercalated GIC is likely to involve two steps: in the first step, graphite nitrate is formed; subsequent reaction in the intercalate layer leads to partial replacement of solvated HNO3by H3PO4molecules. 相似文献
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Dangsheng Su Nadezhda I. Maksimova Vladimir L. Kuznetsov Robert Schlögl Nicolas Keller 《Carbon》2007,45(11):2145-2151
The catalytic properties of sp3-hybridized ultra-dispersed diamond and sp2-hybridized onion-like carbon in the oxidative dehydrogenation of ethylbenzene to styrene were investigated, highlighting the structure sensitivity of the reaction. The sp3-carbon led initially to C-C cleavage and benzene formation, while a switchover of the main reaction pathway into the styrene formation occurred with time on stream due to the formation of surface sp2 carbon, required for the selective styrene formation. This was confirmed by the behavior and the high stable styrene selectivity shown by onion-like carbons. High temperature oxygen pre-treatment created catalytically active species at the sp2 carbon surface, confirming that a high thermal stability carbon-oxygen complex was the active surface site for forming styrene. 相似文献