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Hot Spot in Materials with Structural Defects under High Shear Loading Rates

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Journal of Materials Science & Technology 1998年第1期14卷 72-74页

作者： S. G.psakhie k.p.zolnikov and D. Yu.Saraev (Institute of Strength physics and Materials Science, Russian Academy of Sciences, Siberian Branch,Akademicheskii pr.2/1, 634021 Tomsk, Russia) Institute of Strength physics and Materials Science Russian Academy of Sciences Siberian Branch Akademicheskii pr.2/1 634021 Tomsk Russian Federation

The response of three-dimensional sample of Al, containing vacancy complex, under shear loading was simulated. The molecular dynamics method was used and interaction between atoms was described on the base of pseudopotential theory Solitary waves were generated in the sample under mechanical loading. Their interaction with the vacancy complexes was shown to be able to initiate hot spot in that local region of the complexes. Some parameters of the hot spot as well as solitary waves were calculated. The initiation of the hot spot is accompanied with sufficient local structural relaxation.

关键词： Rev Hot Spot in Materials with Structural Defects under High Shear Loading Rates

About Nonlinear Mechanism of Energy Transformation at Ion Implantation

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Journal of Materials Science & Technology 1999年第6期15卷 581-582页

作者： S.G.psakhie, k.p.zolnikov, R.I.kadyrov, G.E.Rudenskii, S.A.Vassiliev and Yu.p.Shatheev (Institute of Strength physics and Materials Science, Russian Academy of Sciences, Siberian Branch, Tomsk, Russia) Institute of Strength physics and Materials Science Russian Academy of Sciences Siberian Branch Tomsk Russian Federation

The peculiarities of energy dissipation transferred by solitary waves on defects such as freesurface, grain boundary, region with high concentration of vacancies are studied. One of theways of description of the long ... 详细信息

关键词： About Nonlinear Mechanism of Energy Transformation at Ion Implantation

Dissipation of Solitary Waves in Aluminum with Grain Boundary

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Journal of Materials Science & Technology 1998年第5期14卷 475-477页

作者： psakhie, S.G. zolnikov, k.p. Saraev, D.Yu. Institute of Strength physics and Materials Science Russian Academy of Sciences Siberian Branch Akademicheskii pr.2/1 634021 Tomsk Russian Federation

The behavior of passing solitary waves through the region of grain boundary has been investigated on the basis of the molecular dynamics method. It has been shown that solitary waves initiated by compression and shear loading have a different interaction with the grain boundary region. The possibilities of using solitary waves for nondestructive testing of materials, in particular, for testing the quality of coatings, for testing of accumulation of microdamages, etc. have been noted. (Edited author abstract) 5 Refs.

关键词： Aluminum

Nucleation of dislocations and twins in fcc nanocrystals: Dynamics of structural transformations

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Journal of Materials Science & Technology 2019年第1期35卷 201-206页

作者： Aleksandr V.korchuganov Aleksandr N.Tyumentsev konstantin p.zolnikov Igor Yu.Litovchenko Dmitrij S.kryzhevich Elazar Gutmanas Shouxin Li Zhongguang Wang Sergey G.psakhie Institute of Strength physics and Materials Science of Siberian Branch of Russian Academy of Sciences National Research Tomsk State University Technion–Israel Institute of Technology Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences

This paper reports on a molecular dynamics study of structural rearrangements in a copper nanocrystal during nucleation of plastic deformation under uniaxial tension. The study shows that the resulting nucleation of partial dislocations on the free surface and their glide occurs through local fcc→bcc→hcp transformations via consistent atomic displacements. We propose an atomic model for the generation of dislocations and twins based on local reversible fcc→bcc→fcc transformations, with the reverse one proceeding through an alternative system. The model gives an insight into possible causes and mechanisms of the generation of partial dislocations and mechanical twins in two and more adjacent planes of plastically deformed nanocrystals. The obtained data allow a better understanding of how plasticity is generated in nanostructured materials.

关键词： Lattice defects Dislocation Nanotwin Atomic model Molecular dynamics simulations

population Levels of Climate Change Fear in the United States

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American Journal of Climate Change 2021年第1期10卷 1-11页

作者： Casey Mace Firebaugh Tara Rava zolnikov Frances Furio Germaine Ng Department of Health Sciences Central Washington University Ellensburg Washington USA National University Department of Community Health San Diego California USA California Southern University School of Behavioral Sciences Costa Mesa California USA University of Washington Bothell Washington USA

There is increasing evidence that climate change, like other natural disasters has the potential for significant human health impacts, including mental health. Fear as a psychological construct concerning climate change is not well understood. An online cross-sectional survey was conducted, targeting a demographically representative sample of Americans (n = 546) in terms of ethnicity, age, and gender. Survey questions included demographic information and global questions regarding self-rated anxiety and fear of climate change. Ordinal logistic models were created to determine which demographic factors were most predictive of climate change fear in the US population. Over half of the study sample (50.9%) indicated being moderately or very afraid of climate change. In the end, only three factors remained significant (p ported level of anxiety, political affiliation, and identifying and Hispanic/Latino. Climate change fear is still not understood, especially in terms of its impact on the mental health of the population in general, though prolonged fear can be an antecedent to other mental health disorders. This study had demonstrated that fear of climate change impacts over half of the U.S population. Level of fear differs significantly by demographic. This study has provided evidence that climate change fear impacts a significant proportion of the US population, prompting a need to investigate the potential acute and long-term impacts of this fear on the human psyche. The harms and benefits of the fear response to climate change should be explored as well as potential responses to fear due to climate change.

关键词： Climate Change Mental Health Global Adaption Fear Resiliency