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    Wyświetlanie 1-9 z 9
    Tytuł:
    The Influence of Plastic Forming Processes on the Dissolution Rate of Biocompatible Mg Alloys
    Autorzy:
    Boczkal, S.
    Karaś, M.
    Korczak, P.
    Kapinos, D.
    Koprowski, P.
    Szymański, W.
    Wroński, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/355548.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    MgLiCaZn alloys
    biomaterials
    structure
    properties
    immersion test
    Opis:
    The effect of plastic deformation process on the dissolution rate of biocompatible Mg alloys was investigated. Two biocompatible MgLi1Ca0,2Zn1 and MgLi1Ca1Zn1 alloys were selected for the study. The alloys were deformed on a 100T press at a temperature of 350°C by conventional extrusion and by the equal channel angular extrusion process (ECAE). The grain size analysis showed a high degree of the grain refinement from approximately 110 mm in the initial state to 2.8 mm after the 3rd pass of the ECAE process. Compared to as-cast state, the degree of strengthening has increased after plastic forming. The results of biodegradation tests have shown a significant increase in corrosion rate after both conventional extrusion and ECAE, although after subsequent ECAE passes, this rate was observed to slightly decrease in the MgLi1Ca1Zn1 alloy. Based on the results of macro- and microstructure examinations, the corrosion progress in samples after the extrusion process was described.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 3; 997-1004
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Water immersion vs. air insufflation in canine duodenal endoscopy: is the future underwater?
    Autorzy:
    Galiazzo, G.
    Costantino, F.
    Foglia, A.
    Bitelli, G.
    Romagnoli, N.
    Lambertini, C.
    Francolini, C.
    Gaspardo, A.
    Chiocchetti, R.
    Pietra, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2087281.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    dog
    duodenoscopy
    water immersion
    air insufflation
    image analysis
    nociception
    Źródło:
    Polish Journal of Veterinary Sciences; 2020, 23, 4; 581-588
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Studying bilingual and multilingual language identities: natural settings versus formal instruction
    Autorzy:
    Gabryś-Barker, Danuta
    Powiązania:
    https://bibliotekanauki.pl/articles/2051107.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    language identity
    bilingualism
    multilingualism
    metaphoric perceptions
    natural settings
    formal instruction
    immersion
    Opis:
    Becoming more and more a multidisciplinary domain of study, the development of research in second language acquisition, and even more visibly in multilingualism, has moved away from its sole focus on cognitive aspects to social-affective dimensions. Consequently, research in these areas makes more extensive use of research methodology characteristic of social sciences. The focus on identity brings together issues of social context and the construction of one’s identity through negotiation of who we are, how we relate to the outside world and how we position ourselves in relation to others (Pavlenko 2001). Language is the main tool in this construction/ negotiation through the acquisition/learning and use of multiple languages. In relation to the development of one’s multilingual identity, the major distinction has to be made between acquiring a language in its natural context (the case of one’s mother tongue or immigration) and learning it in formal contexts. Block (2014) believes that the issue of identity can only be studied in a natural environment of language acquisition, and not in a formal instruction context. This article aims to confirm or reject the above belief, based on evidence from various studies of bi- and multiple language users and how they perceive their identities and their relation to the languages in their possession. It includes a pilot study of trilingual language learners and their understanding of how the individual languages they know (L1, L2, L3) build their identities and the way they enrich, impoverish or challenge who they see themselves to have been by birth (Gabryś-Barker 2018). The issues discussed relate to external (other people, situations, contexts) and internal identity-building factors (individual affectivity, personality features).
    Źródło:
    Linguistica Silesiana; 2019, 40; 341-359
    0208-4228
    Pojawia się w:
    Linguistica Silesiana
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Non-Certainty-Equivalent Adaptive Control of a Nonlinear Aeroelastic System
    Autorzy:
    Lee, K. W.
    Singh, S. N.
    Powiązania:
    https://bibliotekanauki.pl/articles/226734.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    aeroelastic wing
    adaptive flutter control
    nonlinear system
    immersion and invariance method
    uncertain system
    Opis:
    The development of a non-certainty-equivalent adaptive control system for the control of a nonlinear aeroelastic system is the subject of this paper. The prototypical aeroelastic wing section considered here includes structural nonlinearity and a single control surface for the purpose of control. Its dynamical model has two-degree-of-freedom and describes the plunge and pitch motion. It is assumed that the model parameters (except the sign of one of the control input coefficients) are not known. The uncontrolled aeroelastic model exhibits limit cycle oscillation beyond a critical free-stream velocity. Based on the attractive manifold, and the immersion and invariance methodologies, a non-certainty-equivalent adaptive state variable feedback control law for the trajectory tracking of the pitch angle is derived. Using the Lyapunov analysis, asymptotic convergence of the state variables to the origin is established. It is shown that the trajectory of the system converges to a manifold. The special feature of the designed control system is that the closed-loop system asymptotically recovers the performance of a deterministic controller. This cannot happen if certainty-equivalent adaptive controllers are used. Simulation results are presented which show that the control system suppresses the oscillatory responses of the system in the presence of large parameter uncertainties.
    Źródło:
    International Journal of Electronics and Telecommunications; 2010, 56, 4; 463-471
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Transient Liquid Phase Behavior of Sn-Coated Cu Particles and Chip Bonding using Paste Containing the Particles
    Autorzy:
    Hwang, J. H.
    Lee, J.-H.
    Powiązania:
    https://bibliotekanauki.pl/articles/353042.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Sn-coated Cu
    immersion plating
    chip bonding
    intermetallic compounds (IMC)
    transient liquid phase (TLP)
    sintering
    Opis:
    Sn-coated Cu particles were prepared as a filler material for transient liquid phase (TLP) bonding. The thickness of Sn coating was controlled by controlling the number of plating cycles. The Sn-coated Cu particles best suited for TLP bonding were fabricated by Sn plating thrice, and the particles showed a pronounced endothermic peak at 232°C. The heating of the particles for just 10 s at 250°C destroyed the initial core-shell structure and encouraged the formation of Cu-Sn intermetallic compounds. Further, die bonding was also successfully performed at 250°C under a slight bonding pressure of around 0.1 MPa using a paste containing the particles. The bonding time of 30 s facilitated the bonding of Sn-coated Cu particles to the Au surface and also increased the probability of network formation between particles.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 2B; 1143-1148
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparing of High-Cycle Fatigue Lifetimes in Un-corroded and Corroded Piston Aluminum Alloys in Diesel Engine Applications
    Autorzy:
    Azadi, M.
    Aroo, H.
    Parast, M. S. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2079778.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    bending fatigue
    corrosion fatigue
    piston aluminum alloys
    diesel engines
    immersion time
    zginanie
    zmęczenie korozyjne
    tłoki
    stopy aluminium
    silnik Diesla
    Opis:
    Diesel engine components in the combustion chamber have been exposed to cyclic loadings under environmental effects, including high temperatures and corrosive fluids. Therefore, knowing the corrosion-fatigue behavior of materials is essential for designer engineers. In this article, pure fatigue and corrosion-fatigue behaviors of the piston aluminum alloy have been experimentally investigated. For such an objective, as-cast and pre-corrosive standard samples were tested by the rotary bending fatigue machine, under 4 stress levels. Some specimens were exposed to the corrosive fluid with 0.00235 % of the sulfuric acid for 100 and 200 hours. The results showed higher weight losses for 200 hours immersion times. As another result, it could be concluded that the lifetime decreased in pre-corrosive samples for both 100 and 200 hours of the immersion time, compared to that of as-cast specimens. However, such a lifetime reduction was more significant for 200 hours of the immersion time, especially within the high-cycle fatigue regime (or lower stress levels). Under high stress levels, both pre-corrosive sample types had almost similar behaviors. The field-emission scanning electron microscopy images of specimen fracture surfaces indicated that the brittle region of the fractured surface was larger for specimens after the 200 hours of corrosion-fatigue testing than the other specimen.
    Źródło:
    Archives of Foundry Engineering; 2021, 21, 1; 89-94
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electrochemical Corrosion of Magnesium Alloy AZ31 with Additive Lithium
    Autorzy:
    Przondziono, J.
    Hadasik, E.
    Szala, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/353288.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    magnesium alloy AZ31 with additive of 4.5% Li
    electrochemical corrosion in NaCl
    potentiodynamic test
    immersion test
    SEM
    Opis:
    The purpose of performed tests was evaluation of resistance to electrochemical corrosion of extruded magnesium alloy AZ31 with additive of 4.5% Li. Corrosion tests were performed in 0.01-2.0 M NaCl solutions. Potentiodynamic tests enabled to register polarisation curves. With application of stereoscopic microscope Nikon SMZ745T and electron scanning microscope Hitachi S-4200, the surface of the alloy was observed after immersion tests performed in 1-6 days. Results of performed tests prove explicitly deterioration of corrosion properties of the alloy with the increase of molar concentration of NaCl solution. It can be seen that corrosion process is intensive and that intensity increases with the increase of solution concentration and extension of exposure time.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 4; 2359-2363
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Towards a culture of active participation
    W stronę kultury udziału
    Autorzy:
    Nycz, Ryszard
    Powiązania:
    https://bibliotekanauki.pl/articles/2089352.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cultural theory and practice
    culture of participation
    passivity
    the present moment
    immersion
    testimonial authority
    Ryszard Nycz’s "Culture as Verb"
    kultura udziału
    pasywność
    teraźniejszość
    immersywność
    testymonialność
    Opis:
    The fi rst part of this article brings the author’s reply to the participants of the panel discussion of his book Culture as Verb (Anna Łebkowska, Jakub Momro, Tomasz Rakowski and Dorota Wolska). In the second part he outlines his premises and explains the analytical vocabulary that has enabled him to move from an active to a passive ‘verbal’ understanding of culture. He also draws a broad outline of prospective new research that would complement his project. Central to it is the exploration of what he believes is the dominant contemporary cultural experience, which is based on active participation. To characterize its most important features and forms we should make use of the following, newly defi ned analytical concepts – passivity, the present moment, immersion, and testimonial authority.
    Źródło:
    Ruch Literacki; 2019, 4; 459-473
    0035-9602
    Pojawia się w:
    Ruch Literacki
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Correlation between compressive strengths and water absorption of fly ash cement mortar immersed in water
    Autorzy:
    Huang, Qian
    Zhao, Liang
    Powiązania:
    https://bibliotekanauki.pl/articles/231346.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    zaprawa cementowo-popiołowa
    zanurzenie w wodzie
    cement
    popiół lotny
    wytrzymałość na ściskanie
    absorpcja wody
    korelacja
    cement-fly ash mortar
    water immersion
    fly ash
    compressive strength
    water absorption
    correlation
    Opis:
    The compressive strength and water absorption of cement mortars with different water-binder ratio (0.35, 0.45 and 0.55) and fly ash content (0, 10%, 20% and 30%) under water immersion were investigated, and the correlation between them was further analyzed. The internal microstructure and phase composition of mortar was studied by scanning electron microscopy (SEM) and X-ray diffraction (XRD), respectively. The results show that the inside of mortar mixed with fly ash displayed the loose and porous microstructure. Therefore, the incorporation of fly ash reduced the compressive strength of mortar, especially the early strength, and the strength decreased with the increase of fly ash content, and the water absorption of mortar also increased. There was a linear correlation between the compressive strength and water absorption of mortar with the equation: fc = -3.838β + 62.332, where fc and β represented the compressive strength and water absorption, respectively. Therefore, when the water absorption of mortar immersed in water was measured, its corresponding compressive strength could be preliminarily inferred through this equation, which was of great significance for detecting and identifying the stability and safety of hydraulic structures.
    Źródło:
    Archives of Civil Engineering; 2019, 65, 3; 141-152
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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