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Journal articles on the topic 'Crowdion'

Author: Grafiati

Published: 28 May 2022

Last updated: 30 July 2025

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1

Bayazitov, Ayrat M., Alexander S. Semenov, and Sergey V. Dmitriev. "Simulation of the Dynamics of Supersonic N-Crowdions in fcc Lead and Nickel." Micro 3, no. 3 (2023): 632–42. http://dx.doi.org/10.3390/micro3030044.

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In the case where an interstitial atom is located in a close-packed atomic row of the crystal lattice, it is called a crowdion. Crowdions play an important role in the processes of mass and energy transfer resulting from irradiation, severe plastic deformation, ion implantation, plasma and laser processing, etc. In this work, supersonic N-crowdions (N=1, 2) in fcc lattices of lead and nickel are studied by the method of molecular dynamics. Modeling shows that the propagation distance of a supersonic 2-crowdion in lead at a high initial velocity is less than that of a supersonic 1-crowdion. In

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2

Sharapova, Yu R., A. M. Kazakov, M. N. Semyonova, Zh G. Rahmatullina, D. R. Timerbaev, and E. A. Korznikova. "Dynamics of 2-crowdion and energy transfer in tungsten: atomistic modeling." Vestnik of North-Eastern Federal University 21, no. 4 (2025): 73–80. https://doi.org/10.25587/2222-5404-2024-21-4-73-80.

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The migration of point defects in metals contributes to the transfer of mass and energy during plastic deformation, heat treatment, irradiation, etc. In this regard, the study of such physical processes of nonlinear dynamics of the crystal lattice of metals is an urgent task. In this paper, the dynamics of 2-crowdion and the processes of energy transfer in tungsten are studied, aimed at understanding the mechanisms of defect formation and energy dissipation under extreme temperatures and pressures. It is known that crystal lattices accumulate a large number of defects under external influence,

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3

Fitzgerald, S. P. "Structure and dynamics of crowdion defects in bcc metals." Journal of Micromechanics and Molecular Physics 03, no. 03n04 (2018): 1840003. http://dx.doi.org/10.1142/s2424913018400039.

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Crowdion defects are produced in body-centered-cubic metals under irradiation. Their structure and diffusive dynamics play a governing role in microstructural evolution, and hence the mechanical properties of nuclear materials. In this paper, we apply the analytical Frenkel-Kontorova model to crowdions and clusters thereof (prismatic dislocation loops) and show that the Peierls potential in which these defects diffuse is remarkably small (in the micro eV range as compared to the eV range for other defects). We also develop a coarse-grained statistical methodology for simulating these fast-diff

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4

Markidonov, A. V., M. D. Starostenkov, T. I. Neverova, and A. A. Barchuk. "Dynamic braking of crowdion complexes." Letters on Materials 1, no. 2 (2011): 102–6. http://dx.doi.org/10.22226/2410-3535-2011-2-102-106.

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5

Akchurin, M. Sh, and R. M. Zakalyukin. "A crowdion mechanism of crystal twinning." Crystallography Reports 51, no. 6 (2006): 994–97. http://dx.doi.org/10.1134/s1063774506060101.

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6

Chetverikov, A. P., I. A. Shepelev, E. A. Korznikova, A. A. Kistanov, S. V. Dmitriev, and M. G. Velarde. "Breathing subsonic crowdion in Morse lattices." Computational Condensed Matter 13 (December 2017): 59–64. http://dx.doi.org/10.1016/j.cocom.2017.09.004.

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7

Starikov, S. A., A. R. Kuznetsov, and V. V. Sagaradze. "Crowdion in Deformed FCC Metal. Atomistic Modeling." Physics of Metals and Metallography 122, no. 12 (2021): 1207–12. http://dx.doi.org/10.1134/s0031918x21120115.

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8

Shepelev, I. A., E. A. Korznikova, D. V. Bachurin, A. S. Semenov, A. P. Chetverikov, and S. V. Dmitriev. "Supersonic crowdion clusters in 2D Morse lattice." Physics Letters A 384, no. 1 (2020): 126032. http://dx.doi.org/10.1016/j.physleta.2019.126032.

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9

Fitzgerald, S. P. "Crowdion–solute interactions: Analytical modelling and stochastic simulation." Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 352 (June 2015): 14–17. http://dx.doi.org/10.1016/j.nimb.2014.10.003.

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10

Natsik, V. D., and Y. I. Nazarenko. "Crowdion dynamics in a nonuniformly deformed three-dimensional crystal." European Physical Journal B - Condensed Matter 29, no. 2 (2002): 285–89. http://dx.doi.org/10.1140/epjb/e2002-00302-y.

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11

Natsik, V. D., and E. I. Nazarenko. "Crowdion dynamics in a nonuniformly deformed three-dimensional crystal." Low Temperature Physics 26, no. 3 (2000): 210–17. http://dx.doi.org/10.1063/1.593886.

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12

Kolesnikov, Ivan Dmitrievich, and Igor Aleksandrovich Shepelev. "EXCITATION AND PROPAGATION OF 1-CROWDION IN BCC NIOBIUM LATTICE." Materials. Technologies. Design 4, no. 1 (2022): 5–10. http://dx.doi.org/10.54708/26587572_2022_4175.

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13

Iskandarov, A. M., N. N. Medvedev, P. V. Zakharov, and S. V. Dmitriev. "Crowdion mobility and self-focusing in 3D and 2D nickel." Computational Materials Science 47, no. 2 (2009): 429–31. http://dx.doi.org/10.1016/j.commatsci.2009.09.004.

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14

Korznikova, E. A., I. A. Shepelev, A. P. Chetverikov, S. V. Dmitriev, S. Yu Fomin, and Kun Zhou. "Dynamics and Stability of Subsonic Crowdion Clusters in 2D Morse Crystal." Journal of Experimental and Theoretical Physics 127, no. 6 (2018): 1009–15. http://dx.doi.org/10.1134/s1063776118120063.

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15

Zorya, I. V., and G. M. Poletaev. "Molecular Dynamics Study of Interaction of Carbon, Nitrogen, and Oxygen Impurity Atoms with Self-Interstitial Atoms in Nickel, Silver and Aluminum." Izvestiya of Altai State University, no. 1(117) (March 17, 2021): 27–32. http://dx.doi.org/10.14258/izvasu(2021)1-04.

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The interaction of impurity atoms of carbon, nitrogen, and oxygen with self-interstitial atoms in FCC metals like nickel, silver, and aluminum is studied using the molecular dynamics method. It is found that the self-interstitial atom migration in the crystal lattice follows two mechanisms: dumbbell and crowdion. In this case, the first mechanism that includes one interatomic distance displacement and the rotation of the <001> dumbbell is characterized by broken paths of atomic migration. The second mechanism is described by straight paths along the close-packed directions <011> in

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16

Volosyuk, M. A. "The role of interstitial (crowdion) mass-transfer for crack high-temperature healing under uniaxial loading." Functional materials 22, no. 1 (2015): 51–56. http://dx.doi.org/10.15407/fm22.01.051.

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17

Starostenkov, M. D., P. V. Zakharov, and N. N. Medvedev. "Crowdion interaction with the boundary of bimetallic Ni-Al in the 2D model." Letters on Materials 1, no. 4 (2011): 238–40. http://dx.doi.org/10.22226/2410-3535-2011-4-238-240.

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18

Starostenkov, Mikhail D., Nikolay Medvedev, and Olga Pozhidaeva. "Aggregatization of Frenckel Defects in Ni and Intermetallide Ni₃Al." Materials Science Forum 567-568 (December 2007): 165–68. http://dx.doi.org/10.4028/www.scientific.net/msf.567-568.165.

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The formation of Frenckel pairs - vacancies and interstitial atoms takes place during external high energetical influence. The accumulation and aggregatization of point defects is noticed only at definite conditions. Vacancies form volume vacancy tetrahedrons and interstitial atoms form segregations. The conditions of the formation of point defects complexes on the basis of Frenckel pairs were studied by the methods of molecular dynamics in the dependence on temperature and intensity of external influence. Their possible role in the process of deformation and fracture of materials under study

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19

Korznikova, E. A., V. V. Shunaev, I. A. Shepelev, O. E. Glukhova, and S. V. Dmitriev. "Ab initio study of the propagation of a supersonic 2-crowdion in fcc Al." Computational Materials Science 204 (March 2022): 111125. http://dx.doi.org/10.1016/j.commatsci.2021.111125.

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20

Chen, Di, and Lin Shao. "Molecular dynamics simulation of ion focusing and crowdion formation in self-ion-irradiated Fe." Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 272 (February 2012): 33–36. http://dx.doi.org/10.1016/j.nimb.2011.01.027.

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21

Shepelev, I. A., S. V. Dmitriev, A. Yu Morkina, S. Yu Fomin, and E. A. Korznikova. "Mass transfer in platinum by crowdion clusters initiated by the impact of a Pt2 molecule." IOP Conference Series: Materials Science and Engineering 1008 (January 27, 2021): 012036. http://dx.doi.org/10.1088/1757-899x/1008/1/012036.

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22

Shepelev, I. A., D. V. Bachurin, E. A. Korznikova, A. M. Bayazitov, and S. V. Dmitriev. "Mechanism of remote vacancy emergence by a supersonic crowdion cluster in a 2D Morse lattice." Chinese Journal of Physics 70 (April 2021): 355–62. http://dx.doi.org/10.1016/j.cjph.2021.01.010.

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23

Savchenko, E., I. Khyzhniy, S. Uyutnov, M. Bludov, A. Ponomaryov, and V. Bondybey. "Radiation-induced phenomena in thermally treated Kr matrices." Low Temperature Physics 49, no. 5 (2023): 574. http://dx.doi.org/10.1063/10.0017819.

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The effect of thermal treatment on relaxation phenomena in Kr matrices irradiated with a low-energy electron beam has been studied. The experiments were carried out using measurements of the relaxation emissions of preirradiated Kr samples, which were unannealed and annealed before exposure to an electron beam. Three types of emissions were monitored in a correlated real-time manner: thermally stimulated luminescence, thermally stimulated exoelectron emission, and total yield of particles via pressure measurements. The energy levels of defects were estimated from the thermally stimulated lumin

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24

Landau, A. I., A. S. Kovalev, and A. D. Kondratyuk. "Model of Interacting Atomic Chains and Its Application to the Description of the Crowdion in an Anisotropic Crystal." physica status solidi (b) 179, no. 2 (1993): 373–81. http://dx.doi.org/10.1002/pssb.2221790212.

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25

Yang, Wen, and Yunxin Wu. "Effects of annealing on the micro-internal stress induced by interstitial defects in aluminum crystal by molecular dynamics simulations." AIP Advances 12, no. 2 (2022): 025226. http://dx.doi.org/10.1063/5.0082626.

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Micro-internal stress caused by self-interstitial defects in aluminum crystals was studied by using the molecular dynamics method. The effects of annealing on the lattice structure near the interstitial defects and the evolution of atoms near defects are analyzed. For octahedral, tetrahedral, and crowdion self-interstitial atoms, the atomic stress in the affected area after annealing decreases significantly compared with that before annealing. For dumbbell self-interstitial atoms, there are no obvious changes in atomic stresses in all regions before and after annealing. For four configurations

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26

Kosevich, A. M. "Domain walls connected with spontaneous deformation of an antiferromagnetic chain." Low Temperature Physics 20, no. 10 (1994): 827–31. https://doi.org/10.1063/10.0033723.

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A 1D model of an antiferromagnet (AFM) is analyzed, in which the Frenkel-Kontorova model is generalized to the system of two fields: the atomic displacement field and the field of atomic spin orientations. It is assumed that the equilibrium ordering of atomic masses associated with mechanical interactions between atoms corresponds to a completely frustrated spin ordering. However, magnetoelastic interaction generates a spontaneous uniform deformation leading to either a doubly degenerate, or nondegenerate ground state of the AFM. In both cases, magnetic domains separated by a domain wall (DW)

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27

Kovalev, A. S., A. D. Kondratyuk, A. M. Kosevich, and A. I. Landau. "Theoretical Description of the Crowdion in an Anisotropic Crystal Based on the Frenkel-Kontorova Model Including and Elastic Three-Dimensional Medium." physica status solidi (b) 177, no. 1 (1993): 117–27. http://dx.doi.org/10.1002/pssb.2221770108.

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28

Yurov, V., K. Zhangozin, and D. Kargin. "QUANTUM STRUCTURE OF THE SURFACE LAYER OF ATOMICALLY SMOOTH CRYSTALS." Scientific heritage, no. 155 (February 23, 2025): 73–83. https://doi.org/10.5281/zenodo.14914585.

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In this paper, we propose a model for determining the thickness of the surface layer of metals and the quantum structure of this layer. An atomically smooth metal is represented as a diagram: nanolayer → mesolayer → bulk phase, which differ from each other in the nature of size effects. There is no size effect in the bulk phase. The thickness of the surface layer of metals R(I) has a size from 1 nm to 10 nm, except for cesium, i.e. they represent a nanostructure. It is shown that the energy levels E<sub>n</sub> of the nanolayer are determined by one fundamental parameter - the lattic

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29

Maric, Zeljko. "Crowding out vs. crowding in effects in transitional countries." Perspectives of Innovations, Economics and Business 15, no. 4 (2015): 126–36. http://dx.doi.org/10.15208/pieb.2015.13.

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30

Andrade, João Sousa, and António Portugal Duarte. "Crowding‑in and crowding‑out effects of public and private investments in the portuguese economy." Boletim de Ciências Económicas 57, no. 1 (2014): 351–84. http://dx.doi.org/10.14195/0870-4260_57-1_9.

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31

Schüle, W. "Vacancies, Interstitials and Crowdions." Defect and Diffusion Forum 66-69 (January 1991): 313–26. http://dx.doi.org/10.4028/www.scientific.net/ddf.66-69.313.

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32

Natsik, V. D., and S. N. Smirnov. "Crowdions in elasticity theory." Crystallography Reports 54, no. 6 (2009): 985–92. http://dx.doi.org/10.1134/s1063774509060133.

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33

Anjum, Samreen, Chi Lin, and Danna Gurari. "CrowdMOT." Proceedings of the ACM on Human-Computer Interaction 4, CSCW3 (2021): 1–25. http://dx.doi.org/10.1145/3434175.

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34

Hettiachchi, Danula, Niels van Berkel, Vassilis Kostakos, and Jorge Goncalves. "CrowdCog." Proceedings of the ACM on Human-Computer Interaction 4, CSCW2 (2020): 1–22. http://dx.doi.org/10.1145/3415181.

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35

Bhandari, Ravi, Bhaskaran Raman, K. K. Ramakrishnan, et al. "CrowdLoc." ACM Transactions on Sensor Networks 14, no. 1 (2018): 1–36. http://dx.doi.org/10.1145/3155326.

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36

Chetverikov, A. P., S. V. Dmitriev, E. A. Korznikova, and K. S. Sergeev. "Dissipative solitons and crowdions in triangular lattice of active particles." Journal of Micromechanics and Molecular Physics 04, no. 01 (2019): 1850005. http://dx.doi.org/10.1142/s2424913018500054.

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Behavior of dissipative solitons and crowdions in the triangular lattice of interacting particles is studied by means of numerical simulations. Active properties of particles are determined by non-linear friction which slows down the rapid particles and accelerates slower ones. Local interaction between particles is determined by the modified Morse potential with established cut-off radius. It is shown that the excitation of crowdions in active lattice is possible for some definite values of parameters. Borderlines between crowdions and solitons excitation in a space of parameters and initial

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37

P. Balcerzak, Adam, and Elżbieta Rogalska. "Crowding Out and Crowding in within Keynesian Framework. Do We Need Any New Empirical Research Concerning Them?" Economics & Sociology 7, no. 2 (2014): 80–93. http://dx.doi.org/10.14254/2071-789x.2014/7-2/7.

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38

Manassi, M., B. Sayim, and M. H. Herzog. "When crowding of crowding leads to uncrowding." Journal of Vision 13, no. 13 (2013): 10. http://dx.doi.org/10.1167/13.13.10.

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39

Manassi, M., B. Sayim, and M. H. Herzog. "When crowding of crowding leads to uncrowding." Journal of Vision 13, no. 9 (2013): 624. http://dx.doi.org/10.1167/13.9.624.

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40

Li, Tianyi, Kurt Luther, and Chris North. "CrowdIA." Proceedings of the ACM on Human-Computer Interaction 2, CSCW (2018): 1–29. http://dx.doi.org/10.1145/3274374.

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41

Ahsan Mehmood Shah, Wardah Maryam, Muhammad Saood, et al. "COMPARISON OF VISUAL APPROXIMATION METHOD AND BRASS WIRE METHOD IN ASSESSING MODERATE AND SEVERE CROWDING IN KHYBER COLLEGE OF DENTISTRY, PESHAWAR." Journal of Khyber College of Dentistry 12, no. 2 (2022): 75–79. http://dx.doi.org/10.33279/jkcd.v12i2.69.

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Objectives: To compare whether visual approximation and brass wire method give the same results when assessing moderate and severe crowding. The secondary objective is to compare time taken by two groups of residents in calculating crowding using the two methods.Methods and materials: This cross sectional study was conducted in Orthodontics Department, Khyber College of Dentistry, using two dental models, one with moderate crowding and one with severe crowding. Visual approximation and Brass wire method were performed to assess crowding by 32 orthodontic residents. Results were recorded as mea

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42

Shetty, Vikranth Omprakash, M. S. Ravi, Shraddha Shetti, Jayashri Bhangare, Varada Kudalkar, and Shruti Dhanshetti. "Assessment of Factors Associated with Mandibular Anterior Crowding in Mixed Dentition." Journal of Pharmacy and Bioallied Sciences 16, Suppl 3 (2024): S2608—S2614. http://dx.doi.org/10.4103/jpbs.jpbs_386_24.

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ABSTRACT Introduction: Dental crowding can be defined as a disparity in the relationship between the tooth size and arch length, which results in imbrication and rotation of teeth. Crowding of permanent teeth, especially in the anterior part of the mandible, is believed to be the most frequent form of malocclusion in children. The appropriate age for treatment of crowding is the late mixed dentition period. Aim: To assess and compare the dental and skeletal factors associated with early crowding and non-crowding in children with mixed dentition. Methodology: This experimental cross-sectional s

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43

Normando, David, Marco A. O. Almeida, and Cátia C. A. Quintão. "Dental crowding." Angle Orthodontist 83, no. 1 (2012): 10–15. http://dx.doi.org/10.2319/020112-91.1.

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Abstract Objective: To evaluate the role of genetics and tooth wear in the etiology of dental crowding through the analysis of a split indigenous Amazon population. Materials and Methods: Dental crowding prevalence (n = 117), tooth wear (n = 117), and inbreeding coefficient (n = 288) were compared for both villages. A biometric investigation was performed by dental cast analysis of 55 individuals with no tooth loss. Mann-Whitney statistics, independent t-tests, and Fisher exact tests were used at P &lt; .05. Results: A high coefficient of inbreeding was confirmed in the resultant village (

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44

LEWIS, DONALD E. "Occupational Crowding." Economic Record 72, no. 217 (1996): 107–17. http://dx.doi.org/10.1111/j.1475-4932.1996.tb00945.x.

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45

Wallace, J. M., and B. S. Tjan. "Object crowding." Journal of Vision 11, no. 6 (2011): 19. http://dx.doi.org/10.1167/11.6.19.

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46

Bex, P. J., and S. C. Dakin. "Directional crowding." Journal of Vision 4, no. 8 (2004): 852. http://dx.doi.org/10.1167/4.8.852.

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47

Baron, J., and D. G. Pelli. "Crowding counting." Journal of Vision 6, no. 6 (2010): 198. http://dx.doi.org/10.1167/6.6.198.

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48

Wallace, J. M., and B. S. Tjan. "Object Crowding." Journal of Vision 10, no. 7 (2010): 1334. http://dx.doi.org/10.1167/10.7.1334.

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49

Pelli, D. G., J. Freeman, and R. Chakravarthi. "Crowding combines." Journal of Vision 10, no. 7 (2010): 1348. http://dx.doi.org/10.1167/10.7.1348.

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50

BOLDUC, ANNE. "Jail Crowding." ANNALS of the American Academy of Political and Social Science 478, no. 1 (1985): 47–57. http://dx.doi.org/10.1177/0002716285478001005.

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In light of the constant interaction between local jails and state prisons, a discussion of jail crowding is essential to understanding prison crowding. This article examines the multitude of issues related to jail crowding. The specific causes of jail crowding and numerous solutions, many of which are directly relevant to prison crowding, are discussed.

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