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  15. 1775

    COMPARATIVE RESEARCHES OF FRACTURES OF HIGH-STRENGTH CAST IRON IN THE AS-CAST AND DEFORMED STATE by A. I. Pokrovsky, I. N. Khrol

    Published 2016-01-01
    Subjects: “…the results of comparative studies of fracture surfaces of high-strength cast iron in the as-cast state and after hot direct extrusion through an aperture of a conical die are presented. the shape change of graphite inclusions and components of the metal matrix is examined with increasing the reduction ratio from 0 (as-cast state) to 80%. for the fist time, using the electrochemical etching of the metal matrix of the cast iron, it is demonstrated experimentally that at plastic deformation the ductile flow of graphite inclusions occurs without fracturing of the latter. the surface morphology of a deformed graphite inclusion is revealed. it is shown that inside the inclusion the strain is distributed non-uniformly: the peripheral zones are deformed to a larger extent while the central part may retain its original radial structure. the fact that the most part of graphite inclusions on the fracture surface of the deformed cast iron appeared undamaged (very small amount of fractured inclusions was observed) testifies against the common opinion that graphite acts as a crack nucleation site. a hypothesis is put forward that the crack nucleates in the metal matrix, presumably at the pearlite/ferrite interface, and propagates from one graphite inclusion to another rounding but not damaging the latter.…”
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  16. 1776
  17. 1777

    Prevalence of Dental Erosion among the Young Regular Swimmers in Kaunas, Lithuania by Andrius Zebrauskas, Ruta Birskute, Vita Maciulskiene

    Published 2014-07-01
    Subjects: “…The completed questionnaires focused on the common erosion risk factors were returned by all participants. …”
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  18. 1778

    The impact of carnosine on myosin for a possible intervention or prevention of systolic heart failure by Kim, N.

    Published 2019-08-01
    Subjects: “…systolic heart failure is the most common form of heart failure and occurs when the muscle of the left ventricle of the heart loses its ability to contract…”
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  19. 1779

    Functional State of the Thyroid Gland in Patients with Urticaria by Rudnyk T., Nadashkevіch O., Parashchuk B., Zaychenko Y.

    Published 2013-06-01
    Subjects: “…despite the fact that it would be possible to assume the commonality of the pathogenetic mechanisms of allergic dermatitis and damage to the glands of the internal secretion…”
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