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    Wyświetlanie 1-10 z 10
    Tytuł:
    Determining the Optimum Heap Height Considering the Irrigation Rate and the Slope of Heap Bed Variations in Miduk Copper Mine
    Autorzy:
    Fallahfar, B.
    Rahimi, E.
    Mohaghegh, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402390.pdf
    Data publikacji:
    2015-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    91.60.-x
    91.65.-n
    Opis:
    Determining an optimum height is remarked as one of the most important issues in heap designing and this is obtained by calculating the number and the height of heap lifts. Although the increase of lift height has benefits in heap leaching method from economic point of view, it will reduce the stability and make process problems such as low permeability. The current paper analyzes the effect of sulphuric acid irrigation on the strength parameters of Miduk oxide copper ores. In addition, the result of the process experiments have evaluated with different irrigation rates as well as variable conditions of permeability. From process view, approximately 75% of copper is recovered at irrigation rate of 8 l/h m². Due to the significance of economic and process parameters in determining the optimum height of lifts, these parameters are simultaneously studied. The results are demonstrated that although the increase of irrigation rate and permeability can lead to more copper recovery in this mine, it will remarkably decrease the stable height of lifts. Moreover, changes in the bed slope will have a similar effect on the height of the lifts.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 2B; B-352-B-354
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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:
    Positron Annihilation Lifetime Spectroscopy and Dielectric Measurements of Natural Kaolinite and Kaolinite Intercalated by Potassium Acetate
    Autorzy:
    Leluk, K.
    Orzechowski, K.
    Jerie, K.
    Baranowski, A.
    Słonka, T.
    Głowiński, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047141.pdf
    Data publikacji:
    2006-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    91.60.-x
    77.22.-d
    78.70.Bj
    Opis:
    Intercalation of clay minerals consists in inserting of guest molecules into interlayer area. It results in expanding the interlayer distance and changes of physical and chemical properties of the material. Dielectric spectroscopy, positron annihilation lifetime experiments, X-ray, and thermoanalysis were jointly applied to investigate the structural changes accompanying intercalation.
    Źródło:
    Acta Physica Polonica A; 2006, 110, 5; 621-629
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Doppler Broadening and Positron Lifetime Measurements of Well-Characterized Sandstone and Limestone Rocks
    Autorzy:
    Urban, J. M.
    Quarles, C. A.
    Salaita, G. N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1933548.pdf
    Data publikacji:
    1995-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.60.+z
    91.60.-x
    78.70.Bj
    61.80.Fe
    Opis:
    We measured the S parameter for samples of well-characterized rocks. Some samples were cleaned while others contained natural hydrocarbons. We also saturated some samples with oil. Preliminary results show a difference in the S parameter for sandstone and limestone samples. There is also a significant difference between samples when clean and when containing natural hydrocarbons or when saturated with light oil. We also measured the lifetime spectrum for the same samples in dry, fresh water-saturated, and brine-saturated condition. The observed lifetime spectra could be described with two or three components. While a detailed understanding of the physical processes responsible for the lifetime spectra is still under study, several interesting results have been obtained. The average lifetime is correlated with the S parameter. The porosity of the samples is correlated with the intensity of the third lifetime component. The average lifetime, as well as the second lifetime component, is systematically longer in the sandstone than limestone samples, and in water or brine-saturated samples. The intensity of the third lifetime component is generally larger in the water or brine-saturated samples.
    Źródło:
    Acta Physica Polonica A; 1995, 88, 1; 241-248
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spectroscopic Studies of Poly(ε-Caprolactone)/Sodium Montmorillonite Nanocomposites
    Autorzy:
    Krzaczkowska, J.
    Fojud, Z.
    Kozak, M.
    Jurga, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2043539.pdf
    Data publikacji:
    2005-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    91.60.-x
    71.20.Tx
    78.30.Jw
    36.20.-r
    33.25.+k
    61.10.-i
    Opis:
    Polymer-layered silicate nanocomposites belong to a new class of hybrid materials consisting of organic-synthetic polymer matrix and inorganic filler-layered structure clay minerals. The paper presents the results of FTIR, NMR, and SAXS studies of poly(ε-caprolactone)/sodium montmorillonite nanocomposites. We observed a correlation between the concentration of poly(ε-caprolactone) in nanocomposite samples and structural changes both of the clay mineral and the intercalated polymer. Stiffening of the clay structure appears as a result of poly(ε-caprolactone) intercalation into a clay structure. $\text{}^{27}$Al NMR studies indicated in nanocomposites two non-equivalent sites of aluminium ions, i.e. in octahedral and tetrahedral coordination, whereas in the montmorillonite clay structure the aluminium ions are located in the interlayer space too. We found also that the temperatures of structural changes and softening process of poly(ε-caprolactone) chains in the nanocomposites depend on the concentration of poly(ε-caprolactone).
    Źródło:
    Acta Physica Polonica A; 2005, 108, 1; 187-196
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structural investigation of K-feldspar KAlSi₃O₈ crystals by XRD and Raman spectroscopy: An application to petrological study of Luc Yen pegmatites, Yen Bai province, Vietnam
    Autorzy:
    Huong, L.
    Nhung, N.
    Kien, N.
    Zubko, M.
    Häger, T.
    Hofmeister, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1075745.pdf
    Data publikacji:
    2016-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.05.cp
    78.30.-j
    81.70.Jb
    82.80.-d
    91.65.-n
    91.60.-x
    Opis:
    K-feldspars in pegmatites from Luc Yen gem mining area, Yen Bai province, Vietnam were studied by X-ray fluorescence, X-ray powder diffraction and the Raman spectroscopy. Chemical analysis determined the K-feldspars in the form: of (K_{0.8909}Na_{0.0388}Ca_{0.002}Pb_{0.0042}Cs_{0.0024}Rb_{0.0338})(Al_{0.9975}Fe_{0.0053}Ti_{0.0004})Si_{2.988}O₈. Both X-ray powder diffraction and Raman spectroscopy indicated Luc Yen K-feldspars as orthoclase phase. Together with the values of Al content of the T1 tetrahedral sites in orthoclase, it is understood that Luc Yen pegmatites are of young ages (Cenozoic) and shallow intrusive types.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 4; 892-893
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Earth Materials at High Pressure and Temperature: Recent Contributions from in situ Synchrotron X-Ray Diffraction
    Autorzy:
    Redfern, S. A. T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1963306.pdf
    Data publikacji:
    1997-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    64.60.-i
    07.35.+k
    91.35.-x
    Opis:
    The application of synchrotron X-ray powder diffraction to the study of minerals and understanding of the structure and dynamics of the Earth's deep interior is summarised. The salient features of the diamond anvil cell and large-volume multi-anvil cell high-P/T apparatus as used at synchrotron radiation sources are described, and recent developments and applications of these techniques within high-P/T mineralogy are reviewed.
    Źródło:
    Acta Physica Polonica A; 1997, 91, 4; 659-668
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Properties and Phase Constitution of the Nanocrystalline $(Nd_{10}Fe_{67}B_{23})_{100-x}Nb_{x}$ (where x=1, 2, 3, 4) Alloy Ribbons
    Autorzy:
    Kaźmierczak, M.
    Pawlik, K.
    Pawlik, P.
    Gębara, P.
    Przybył, A.
    Wysłocki, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402329.pdf
    Data publikacji:
    2015-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.20.En
    91.60.Pn
    Opis:
    In the present work the magnetic properties and phase constitution of $(Nd_{10}Fe_{67}B_{23})_{100-x}Nb_{x}$ (where x=1, 2, 3, 4) alloys in a form of ribbons were investigated. The ribbon samples were obtained by controlled atmosphere melt-spinning technique. In order to generate the nanocrystalline microstructure, ribbons were annealed at various temperatures (from 923 K to 1023 K) for 5 min. Subsequent annealing resulted in an evolution of the phase constitution accompanied by a change of their magnetic properties. The X-ray diffraction studies show presence of hard magnetic $Nd_{2}Fe_{14}B$, paramagnetic $Nd_{1+\epsilon}Fe_{4}B_{4}$ and ferromagnetic metastable $Nd_{2}Fe_{23}B_{3}$ phases. The best hard magnetic parameters were measure for annealed ribbons of the $(Nd_{10}Fe_{67}B_{23})_{96}Nb_{4}$ alloy.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 1; 91-93
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Elastic and Thermodynamic Properties of Anti-Perovskite Type Superconductor $MCNi_3$ (M = Zn, Cd)
    Autorzy:
    Duan, M.
    Tan, J.
    Ji, G.
    Chen, X.
    Zhu, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1535766.pdf
    Data publikacji:
    2010-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.15.Mb
    62.20.D-
    91.60.Gf
    Opis:
    The elastic and thermodynamic properties of the anti-perovskite superconductor $ZnCNi_3$ and $CdCNi_3$ are investigated by first-principles calculations. With the local density approximation as well as the generalized gradient approximation for exchange and correlation, the ground state properties and equation of state are obtained, which agree well with other theoretical calculations and experiments. Furthermore, by the elastic stability criteria, we predict that $ZnCNi_3$ and $CdCNi_3$ are not stable above 98.1 GPa and 196.5 GPa, respectively. The dependences of the heat capacity, thermal expansion coefficient, the Grüneisen parameter and bulk modulus ($B_{T}$ and $B_{S}$) on pressure and temperature for $ZnCNi_3$ and $CdCNi_3$ are also obtained successfully.
    Źródło:
    Acta Physica Polonica A; 2010, 118, 4; 652-658
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation and Generation of Vacancies in Alpha Quartz by Soft X-Rays
    Autorzy:
    Janavičius, A.
    Purlys, R.
    Bulkšas, A.
    Balakauskas, S.
    Mekys, A.
    Šablinskas, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1585100.pdf
    Data publikacji:
    2009-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.40.-z
    78.30.-j
    91.60.Mk
    Opis:
    In this paper we applied the soft-X-ray radiation for generation of point defects, vacancies, and chemical reactions in quartz $(SiO_{2})$, taking into account our earlier made similar experiments with crystal silicon and importance of quartz for applications in many fields. In this case only radiative Auger's effects with electrons and electric dipole of atoms transitions can generate metastable vacancies, point defects, and induce chemical reactions. Usually, for point defects generation doses of gamma rays are used. We measured values of the Bragg reflections of X-rays and calculated mean square deviations of atoms in crystal lattice for defining the dynamics of irradiated point defects. We accomplished infrared measurements for establishing of generated chemical reactions, and conductivity measurements were also done.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 6; 1076-1080
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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