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    Wyświetlanie 1-8 z 8
    Tytuł:
    Structural control in tissue development
    Sterowanie rozwojem tkanki
    Autorzy:
    Wojnar, R
    Powiązania:
    https://bibliotekanauki.pl/articles/279703.pdf
    Data publikacji:
    2005
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    2D crystallization
    phyllotaxis
    dislocations
    plasticity
    gliding and climbing dislocations
    control
    Opis:
    Occurrence of defects begins a process of destruction of a crystal, its existence is, however, necessary for the crystal growth. In an analogous manner as in propagation of defects during crystallization, the growing of a tissue stress leads to buckling and undulation down to order of the cell diameter. It is shown that the structural control in a tissue development is accomplished by wave-like rearrangement of 5-7 dislocations. The oriented cell divisions as 5-7 climbing can be explained analogously.
    Pojawienie się defektów w krysztale zapoczątkowuje jego zniszczenie, jednak ich istnienie i ruch jest konieczne także podczas wzrostu. W podobny sposób, w jaki powstaje ruch defektów w czasie krystalizacji, napięcia wzrostu tkanki wywołują wyboczenie i falowanie struktury na różnych poziomach aż do poziomu komórki. Pokazujemy, że sterowanie rozwojem tkanki biologicznej zachodzi poprzez falopodobną zmianę układu dyslokacji typu 5-7. Podobnie jako pojawianie się układów komórek typu 5- i 7-kątów można wyjaśnić podział zorientowanych komórek.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2005, 43, 4; 805-812
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamic evolution of mixed circular edge-screw dislocations
    Autorzy:
    Gao, P.
    Li, J.
    Cheng, K.
    Duan, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/173359.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    mixed circular edge-screw dislocations
    optical vortex
    circular edge dislocations
    atmospheric turbulence
    Opis:
    Based on the extended Huygens–Fresnel principle, the analytical expressions for the cross-spectral density function of mixed circular edge-screw dislocations beams propagating through atmospheric turbulence have been derived, and used to study the dynamic evolution of mixed circular edge-screw dislocations in free space and atmospheric turbulence. It is shown that the radius of circular edge dislocations increases with increasing propagation distance, and both the positions of the optical vortex and the center of circular edge dislocations are located at the point (0, 0) when mixed circular edge-screw dislocations propagate in free space. When mixed circular edge-screw dislocations propagate in the atmospheric turbulence, the position of optical vortices varies with increasing propagation distance, the circular edge dislocation evolves into a pair of optical vortices with the opposite topological charge ±1, and the pair of optical vortices will annihilate as soon as the propagation distance becomes large enough.
    Źródło:
    Optica Applicata; 2017, 47, 3; 471-481
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Misfit dislocation in a precipitate/matrix interface of any orientation relative to the matrix free-surface
    Autorzy:
    Colin, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/38607047.pdf
    Data publikacji:
    2020
    Wydawca:
    Instytut Podstawowych Problemów Techniki PAN
    Tematy:
    dislocations
    linear elasticity
    micro-mechanics
    modelling
    Opis:
    The presence of an edge dislocation in a surface of a two-dimensional precipitate of square shape embedded in a semi-infinite matrix has been discussed when the precipitate is submitted to misfit strain due to the lattice mismatch between the two phases. Considering any orientation of the precipitate relative to the matrix free-surface, the total force applying on the dislocation has been analytically calculated and its equilibrium position has been determined. The conjugated effects of the precipitate misorientation, of the lattice mismatch and of the precipitate/matrix distance have been finally characterized. A shifting effect on this equilibrium position has been analyzed.
    Źródło:
    Archives of Mechanics; 2020, 72, 5; 445-464
    0373-2029
    Pojawia się w:
    Archives of Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Lineaments interpreted at the radar images and the digital elevation model within the Palaeozoic rocks of the Holy Cross Mts.
    Autorzy:
    Graniczny, M.
    Mizerski, W.
    Piątkowska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2065890.pdf
    Data publikacji:
    2005
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    radar images
    Holy Cross Mountains
    cartography
    tectonics
    dislocations
    DEM
    Opis:
    Lineaments, visible in radar images and detected with the digital elevation model, and occurring within the Palaeozoic of the Holy Cross Mts., were analysed using computer processing of the tectonic data. The fault network in the Palaeozoic Holy Cross Mts., up to now studied mostly with surface cartography methods, is rather weakly expressed in linear structures, discernible in aerial, satellite and radar imagery. A detailed analysis allowed to determine main directions of the lineaments of tectonic origin and to arrive at cinematic characteristics of large dislocations present, important for reconstructing the tectogenesis of the area.
    Źródło:
    Przegląd Geologiczny; 2005, 53, 10/2; 949-955
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microhardness analysis of halite from different salt-bearing formations
    Autorzy:
    Toboła, Tomasz Tadeusz
    Cyran, Katarzyna
    Rembiś, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/2058643.pdf
    Data publikacji:
    2019
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    microhardness
    halite
    salt formation
    crystal defects
    dislocations
    shape of imprins
    Opis:
    Microhardness tests were carried out on single halite crystals. They were conducted on the (001) surface, with the indenter set in two directions: parallel to the halite face (010); and parallel to the (110) face. The halite crystals represent salt formations of different ages (Devonian, Zechstein, Badenian), depths (from 1835.5 to 195 m) and intensities of tectonic disturbance (horizontally stratified, salt dome, strongly folded). The measurement results revealed specific features of the halite crystals analysed. Firstly, the data obtained show microhardness anisotropy in halite crystals. Moreover, microhardness correlates with the depth of the salt-bearing formations. Halite crystals from deeper levels showed higher microhardness, though there was no correlation between the intensity of tectonic deformation and the average Vickers hardness (HV). The samples analysed show a variability of HV values and and of the shapes of imprints. These indicate zones where halite crystals are deformed at the atomic level and reflects the presence of defects in the crystal lattice. Such deformation is reflected in an irregularity of the strike of cleavage planes. Consequently, the analysis of imprint shapes is a useful method for the examination of ductile minerals and materials.
    Źródło:
    Geological Quarterly; 2019, 63, 4; 771--785
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Radiation-stimulated changes in the characteristics of surface-barrier AL–SI–BI structures with different concentrations of dislocations at the crystal surface
    Autorzy:
    Pavlyk, B.
    Kushlyk, M.
    Slobodzyan, D.
    Matvijishyn, I.
    Lys, R.
    Jałbrzykowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/386556.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    silicon
    dislocations
    surface-barrier structures
    surface layers
    radiation
    reconstruction of defects
    Opis:
    We report the results of studies for the radiation-stimulated changes in electro-physical characteristics of surface-barrier Al–Si–Bi structures based on p-Si. We demonstrate that the X-ray irradiation is accompanied by different processes which depend on the density of the dislocations in the original silicon crystals. A usual evolution of the existing structural defects and their radiationstimulated ordering dominate when the concentration remains low enough. Increase in the concentration causes the increasing role of generation of additional radiation defects. Modelling of the underlying physical processes has testified that the near-contact Si layers are strained. They act as getters for the structural defects and impurities.
    Źródło:
    Acta Mechanica et Automatica; 2018, 12, 1; 72-77
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Oxide crystals on the surface of porous indium phosphide
    Autorzy:
    Suchikova, Y. O.
    Bogdanov, I. T.
    Kovachov, S. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/378528.pdf
    Data publikacji:
    2019
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    oxide clusters
    electrochemical etching
    indium phosphide
    dislocations
    skupiska tlenków
    trawienie elektrochemiczne
    fosforek indu
    Opis:
    Purpose: f this paper is to is to establish the patterns of oxide formation on the surface of indium phosphide during electrochemical etching of mono-InP. Design/methodology/approach: A porous surface was formed with the anode electrolytic etching. Morphology of the surface was studied with the help of scanning electron microscope JSM-6490. The analysis of chemical composition of porous surface of samples was also performed. Findings: It was shown that during the electrochemical etching of indium phosphide, oxide films and crystallites form on the surface. It has been established that crystalline oxides are formed mainly on the surface of n-type indium phosphide. Continuous oxide films are predominantly formed on the surface of p-InP. Research limitations/implications: The research was carried out for indium phosphide samples synthesized in the solution of hydrofluoric acid, though, carrying out of similar experiments for crystalline oxides on the surface of porous indium phosphide obtained in other conditions, is necessary. Practical implications: The study of oxide crystals on the surface of porous indium phosphide has great practical importance since it is the reproducibility of experimental results that is the main problem of modern materials science, the more nanoengineering. Oxides can significantly affect the properties of materials. On the one hand, oxides significantly affect the recombination properties of materials, this can impair the operation of semiconductor devices. On the other hand, oxide films can serve as a passivating coating for the surface of a porous semiconductor. Such an oxide property will be useful for the practical application of nanostructured indium phosphide. Therefore, questions of the conditions for the formation of semiconductor intrinsic oxides, their structure, and chemical composition, and also the effect of oxides on the physical and technical characteristics of materials are important. Originality/value: The patterns of oxide formation on the surface of indium phosphide during electrochemical etching are investigated in this work. It is shown for the first time that the structure of an oxide depends on the orientation of the surface of the semiconductor. It was shown that continuous oxide films are formed on the surface of p-InP, and oxide crystalline clusters are formed on the surface of n-InP.
    Źródło:
    Archives of Materials Science and Engineering; 2019, 98, 2; 49-56
    1897-2764
    Pojawia się w:
    Archives of Materials Science and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Plastic Instabilities Induced by the Portevin - Le Châtelier Effect and Fracture Character of Deformed Mg-Li Alloys Investigated Using the Acoustic Emission Method
    Autorzy:
    Pawełek, A.
    Piątkowski, A.
    Wajda, W.
    Skuza, W.
    Tarasek, A.
    Ranachowski, Z.
    Ranachowski, P.
    Ozgowicz, W.
    Kúdela, Jr.
    Kúdela, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/353865.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    lightweight alloys
    acoustic emission
    fracture
    Portevin-Le Châtelier phenomenon
    twinning
    dislocations
    shear bands
    Opis:
    The results of the investigation of both mechanical and acoustic emission (AE) behaviors of Mg4Li5Al and Mg4Li4Zn alloys subjected to compression and tensile tests at room temperature are compared with the test results obtained using the same alloys and loading scheme but at elevated temperatures. The main aim of the paper is to investigate, to determine and to explain the relation between plastic flow instabilities and the fracture characteristics. There are discussed the possible influence of the factors related with enhanced internal stresses such as: segregation of precipitates along grain boundaries, interaction of solute atoms with mobile dislocations (Cottrell atmospheres) as well as dislocation pile-ups which may lead to the microcracks formation due to the creation of very high stress concentration at grain boundaries. The results show that the plastic flow discontinuities are related to the Portevin-Le Châtelier phenomenon (PL effect) and they are correlated with the generation of characteristic AE pulse trains. The fractography of broken samples was analyzed on the basis of light (optical), TEM and SEM images.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 2A; 897-904
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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