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Wyszukujesz frazę "Lima, A. F." wg kryterium: Autor

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    Wyświetlanie 1-5 z 5
    Tytuł:
    Thermoluminescent Mechanism in Lilac Spodumene
    Autorzy:
    Souza, S. O.
    Watanabe, S.
    Lima, A. F.
    Lalic, M. V.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047867.pdf
    Data publikacji:
    2007-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    91.60.-x
    78.60.Kn
    61.72.-y
    Opis:
    In the present work the thermoluminescence of a lilac α-spodumene (LiAlSi$\text{}_{2}$O$\text{}_{6}$), a natural mineral from Brazil, was investigated. Toward this aim the gamma irradiation, as well as several heating processes were carried out. The sample presented a glow curve with various thermoluminescence peaks. Emission spectrum showed only one prominent band at 610 nm, which indicates the existence of only one recombination center despite the several thermoluminescence centers exhibited, due to intrinsic defects. Using correlation between thermoluminescence and optical absorption techniques we discuss the effects of gamma radiation and annealing in the lilac spodumene, and conclude that an annealing at about 230ºC can be applied to natural lilac spodumene gems used in jewelry for increment of its lilac color.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 5; 1001-1006
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Methodological aspects of the quantification of dispersible clay and its relationship with soil properties along a catena under no-till management
    Autorzy:
    de Paula, A.L.
    Giarola, N.F.B.
    de Lima, R.P.
    Wiecheteck, L.H.
    da Silva, A.P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2082881.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    soil structure
    erodibility
    aggregation
    Opis:
    Continuous no-till management of sloping cultivated areas can promote soil property transformations, causing changes in aggregation and dispersion. The objective of this work was (i) to quantify the readily and mechanically dispersible clays using different methods and (ii) to examine their relationships with soil properties along a catena under no-till management. For this study, the catena was divided into three distinct parts: crest, upper-slope and mid-slope positions. Undisturbed soil cores were sampled at each slope position to determine the following soil properties: organic carbon, Ca2+, Mg2+, K+, Al3+, P, pH, cation exchange capacity and total clay content. Additionally, the levels of readily dispersible clay were measured using turbidimeter and hydrometer methods, whereas mechanically dispersible clay was quantified using the turbidimeter method. We observed high influence of total clay content and organic carbon on soil flocculation; P, Mg2+ and cation exchange capacity were positively related to clay dispersion. Soil management and water transport downslope are probably influencing changes in soil properties and determining the distribution of dispersible clay contents along the catena. No relationships were observed between readily dispersible clay measured using turbidimeter and hydrometer in terms of quantity. Hydrometer and turbidimeter measurements can deliver significantly different results regarding dispersible clay quantification, potentially leading to misinterpretations concerning the amount of clay dispersed in water.
    Źródło:
    International Agrophysics; 2020, 34, 2; 273-280
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    SDRE applied to position and vibration control of a robot manipulator with a flexible link
    Autorzy:
    Lima, J. J.
    Tusset, A. M.
    Janzen, F. C.
    Piccirillo, V.
    Nascimento, C. B.
    Balthazar, J. M.
    Brasil, R. M. L. R. F.
    Powiązania:
    https://bibliotekanauki.pl/articles/281764.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    SDRE control
    flexible robotic arm
    SMA
    active vibration control
    Opis:
    This paper presents position and vibration control of a flexible robot composed of two rigid and one flexible links. Position is controlled by the current applied to the DC motor armature. To control vibrations of the flexible structure, Shape Memory Alloys (SMA) are used. Due to phase transformations, the SMA can change its stiffness through temperature variation, considering and taking advantage of this characteristic the vibration control is done. Control is achieved via the State Dependent Ricatti Equations (SDRE) technique, which uses suboptimal control and system local stability search. The simulation results show the feasibility of the proposed control for the considered system.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2016, 54, 4; 1067-1078
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis, characterization and catalytic properties of SAPO-11 molecular sieve synthesized in hydrothermal media using di-isopropylamine as template
    Autorzy:
    Chellappa, T.
    Costa, M. J. F.
    Nascimento, W. A.
    Ferreira De Lima, L.
    Bassan, I. A.
    Tavares, M.
    Fernandes, V. J.
    Menezes, A.
    Guilherme Meira, L.
    Telesforo Nóbrega De Medeiros, J.
    Maribondo Do Nascimento, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/200372.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    microporous materials
    SAPO-11
    characterization
    catalytic activity
    molecular sieves
    Opis:
    A microporous SAPO-11 Molecular sieve was successfully synthesized by the hydrothermal method, using a single agent, as an organic template: di-isopropylamine (DIPA). The obtained solid was calcined at 550◦C for three hours, after which the flow of nitrogen was exchanged for that of synthetic air and submitted for another ten hours of calcination, so as to remove the single agent: di-isopropylamine, which after the removal of the template could be observed by the high crystallization of the sample. Furthermore, the molecular sieve was characterized by XRD, SEM, TG-DTG and N2 adsorption desorption (BET analysis). The obtained catalyst proved to have a high potential catalytic activity and selectivity, through the obtained characterization results, exhibiting good hydrothermal stability. The catalytic performance of SAPO-11 was tested by the deactivation/regenerability of the coked sample, furthered by cracking of n-hexane reaction and high olefins selectivity was obtained.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2014, 62, 3; 481-488
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Positronium Trapping in Porous Solids: Means and Limitations for Structural Studies
    Autorzy:
    Kajcsos, Zs.
    Liszkay, L.
    Duplâtre, G.
    Varga, L.
    Lohonyai, L.
    Pászti, F.
    Szilágyi, E.
    Lázár, K.
    Kótai, E.
    Pál-Borbély, G.
    Beyer, H. K.
    Caullet, P.
    Patarin, J.
    Azenha, M. E.
    Gordo, P. M.
    Lopes Gil, C.
    de Lima, A. P.
    Ferreira Marques, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2042216.pdf
    Data publikacji:
    2005-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    36.10.Dr
    78.70.Bj
    61.43.Gt
    Opis:
    Positron annihilation techniques are used for the structural investigation of solids but the interpretation of results in grainy and porous media is still unclear. A unique picture can be obtained assuming that the dominant process is Ps trapping in competing "extended free volume" sites. In samples with a large amount of free volumes near-saturation Ps trapping will rule the lifetime pattern, and very long lifetimes of over 100 ns might arise from o-Ps trapped in mesopores. It is shown that lifetime parameters must be corrected for the 3γ/2γ counting efficiency ratio. The results demonstrate the high sensitivity of Ps to mesopores in zeolites but also that Ps-trapping poses limitations on the applicability of lifetime to structural investigation in porous systems. The evolution of the lifetime spectra upon changes in the sample and measuring conditions should be considered in a complex way, observing not only changes in some selected components but in the whole lifetime pattern simultaneously.
    Źródło:
    Acta Physica Polonica A; 2005, 107, 5; 729-737
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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