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    Wyświetlanie 1-12 z 12
    Tytuł:
    Stability and Performance Characteristics of a Digital Positron Lifetime Spectrometer
    Autorzy:
    Aavikko, R.
    Rytsölä, K.
    Nissilä, J.
    Saarinen, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/2042175.pdf
    Data publikacji:
    2005-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    06.60.Jn
    07.05.Hd
    78.70.Bj
    07.85.Nc
    Opis:
    We summarize the setup and performance tests of a digital positron lifetime spectrometer presently in routine use at HUT/Laboratory of Physics. The performance of the spectrometer is found to be equal to or better than that of an analog spectrometer with similar detectors. We present also results on measuring the stability of the system, which is found to be similar to that of analog spectrometers: variation in the time-zero of the spectrometer is found to be ≈10 ps/week. We suggest that the remaining instabilities of the spectrometers originate primarily from the detectors.
    Źródło:
    Acta Physica Polonica A; 2005, 107, 4; 592-597
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    SEM and X-Ray Diffraction Studies on Microstructures in Cu-26.04%Zn-4.01%Al Alloy
    Autorzy:
    Aldirmaz, E.
    Celik, H.
    Aksoy, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399514.pdf
    Data publikacji:
    2013-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.66.Dk
    07.85.Nc
    61.05.cp
    68.37.Hk
    81.10.Aj
    Opis:
    Due to fact that Cu-based alloys are very sensitive to the thermal treatments, in scanning electron microscopy and X-ray diffraction observations, according to the different quenching techniques Cu-26.04%Zn-4.01%Al alloys can display different product phases such as martensite and precipitation. Rapidly cooling sample was formed as M18R structure from the ordered $DO_3$ phase and in the monoclinic case, β=89.1° determined for sample. It was seen that a α-precipitation (fcc) phase in the matrix is slowly cooling.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 1; 87-89
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preparation and Phase Transformation of Mullite-Zirconia from Boehmite and Algerian Halloysite
    Autorzy:
    Raghdi, A.
    Heraiz, M.
    Sahnoune, F.
    Ouali, A.
    Redaoui, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1033372.pdf
    Data publikacji:
    2017-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Mh
    68.37.hk
    07.85.Nc
    Opis:
    In this work, mullite-zirconia composite were fabricated by reaction sintering of Algerian halloysite Al₂Si₂O₅(OH)₄, boehmite Al(OOH), and zirconia (ZrO₂) powder using conventional heating. The appropriate amount of the three raw powders was ball milled for 5 h and sintered between 1250 and 1650°C for 2 h. A scanning electron microscope was used to characterize the microstructure of sintered samples. A dilatometer and X-ray diffractometer were used to analyze the formation and transformation of phases. It is found that for the addition of zirconia up to 20wt.% the zirconia phase retains its tetragonal structure. The formation of primary mullite in all samples was complete at 1220°C. The cristobalite started to form at 1350°C, and disappeared at 1500°C in the samples of mullite, and at 1450°C when ZrO₂ was added. The zircon compound ZrSiO₄ started to form at 1350°C and completely disappeared at 1550°C. The increase in ZrO₂ ratio promoted the formation of grains with a spherical shape.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 1; 136-138
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    PIXE Analysis of Persian Miniature Used in 16th Century Poetry Manuscript
    Autorzy:
    Kakuee, O.
    Fathollahi, V.
    Oliaiy, P.
    Lamehi-Rachti, M.
    Sharafi, M.
    Kasiri, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1198671.pdf
    Data publikacji:
    2014-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    82.80.Ej
    07.85.Nc
    Opis:
    In Persian culture, precious poetry manuscripts used to be decorated by miniature paintings and illuminations to visualize the story of the poem to the reader. The Joseph and Zulaikha story written in Persian by Jami (1414-1492) is one of the poetry books which has attracted considerable attention and has been copied and decorated by calligraphers and painters several times. This paper will focus on characterization of Persian miniature of the Joseph and Zulaikha created in the 15th-16th century in the Bokhara school. To collect the required information for preservation, restoration, and authenticity of the masterpiece, the elemental composition of the applied pigments in the miniature paintings as well as the elemental composition of the employed ink and paper was analyzed by external PIXE.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 5; 1244-1248
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Natural Radioactivity Levels on Surface Water of Nemrut Crater Lake (Bitlis, Turkey)
    Autorzy:
    Kuluöztürk, M.
    Doğru, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402433.pdf
    Data publikacji:
    2015-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    07.85.Nc
    92.20.Td
    Opis:
    Nemrut Crater lake is the world's second largest and largest of Turkey crater lake and its altitude is 2250 m. The aim of this study is to determine radioactivity levels of the lake surface water. In this study water samples were collected from 33 points of the lake surface. The gross alpha and gross beta activity concentrations were determined by using ultra low level α/β counter. The mean gross alpha and beta activity concentrations were found to be 77.69 mBqL¯¹ and 115.36 mBqL¯¹ respectively. Contour maps were produced for gross alpha and beta concentrations of the lake.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 2B; B-397-B-399
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Natural Radioactivity and Radiation Hazards in Coals Extracted in Amasya, Turkey
    Autorzy:
    Boz, M.
    Öner, F.
    Mavi, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402393.pdf
    Data publikacji:
    2015-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    07.85.Nc
    92.20.Td
    Opis:
    Radioactive nuclei were created at the beginning of the Universe and with a long half-life, are still present in Earth's crust. The radiations due to the radionuclides contribute to natural background radiation. This generally occurs in ground-source materials (stone, soil, rocks, etc.) in different concentrations. The levels of radiation are due to the uranium, thorium and potassium present in the material. In this study, the natural radioactivity concentrations of coals extracted in Suluova have been determined using a NaI(Tl) γ -ray spectrometer system. The radium equivalent activities of the samples were all below the recommended limit values (370 Bqkg¯¹). The value of external hazard indices is less than unity.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 2B; B-360-B-362
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanism and kinetic parameters of the thermal decomposition of gibbsite Al(OH)₃ by thermogravimetric analysis
    Autorzy:
    Redaoui, D.
    Sahnoune, F.
    Heraiz, M.
    Raghdi, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1057886.pdf
    Data publikacji:
    2017-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.70.Pg
    81.05.Je
    81.05.Mh
    81.30.Mh
    07.85.Nc
    Opis:
    In this study, the mechanism and the kinetic parameters of the thermal decomposition of gibbsite Al(OH)₃ were studied by differential thermogravimetry technique under non-isothermal conditions, between room temperature and 1200 K at heating rates of 5, 10, 15 and 20°C min¯¹. The obtained differential thermogravimetry curves show clearly three distinct peaks. The first peak is due to the partial dehydroxylation of gibbsite. Among the 32 types of differential equations of non-isothermal kinetics, we have found that the most suitable mechanism is (A_{3/2}: g(x)=[-ln(1-x)]^{2/3}) also called Avrami-Erofeev equation of order 2/3. The values of the activation energy E_{A} and of the pre-exponential factor K are 157 kJ mol¯¹ and 7.58×10¹⁵ s¯¹, respectively. The second peak corresponds to the decomposition of gibbsite to boehmite. Decomposition is controlled by the rate of second-order reaction (F₂: g(x)=(1-x)¯¹-1), under the applied conditions. The activation energy E_{A} and pre-exponential factor K correspond to 243 kJ mol¯¹ and 3.73×10²² s¯¹, respectively. The third peak is due to transformation of boehmite to alumina. However the mechanism for such transformation is better described by the 3/2 rate order reaction (F_{3/2}: g(x)=(1-x)^{-1/2}-1). In addition, the values of E_{A} and K were determined to be around 296 kJ mol¯¹ and 1.82×10¹⁹ s¯¹, respectively. The results of differential thermogravimetry were supplemented by the differential thermal analysis. X-ray powder diffraction analysis was carried out for samples of gibbsite treated at different temperatures between 200 and 1200°C in 200°C steps.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 3; 562-565
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Laboratory Dispersive EXAFS Spectrometer
    Autorzy:
    Mosset, A.
    Lecante, P.
    Baules, P.
    Jaud, J.
    Galy, J.
    Burian, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1963392.pdf
    Data publikacji:
    1997-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    07.85.Nc
    61.10.Ht
    61.43.-j
    Opis:
    We report on a laboratory EXAFS spectrometer optimized for transmission dispersive mode. Absorption edges ranging from 6 to 20keV can be studied. Factors determining energy range and resolution are detailed. A new asymmetric geometry which allows to use all the lattice planes of the dispersing crystal is described and the choice of the best plane analysed. EXAFS spectra of Cu metal and Cu acetate, obtained on this laboratory facility, are compared to the corresponding spectra recorded on the French synchrotron facility (LURE).
    Źródło:
    Acta Physica Polonica A; 1997, 91, 4; 825-828
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Particle Impact Angle, Erodent Particle Size and Acceleration Pressure on the Solid Particle Erosion Behavior of 3003 Aluminum Alloy
    Autorzy:
    Yıldıran, Y.
    Avcu, E.
    Şahin, A.
    Fidan, S.
    Yetiştiren, H.
    Sınmazçelik, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1195082.pdf
    Data publikacji:
    2014-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Bx
    81.70.-q
    68.35.B-
    68.35.-p
    42.79.Ls
    68.37.Hk
    07.85.Nc
    Opis:
    This study aims to examine solid particle erosion behavior of 3003 aluminum alloy. 3003 aluminum alloy samples were eroded in erosion test rig under various particle impingement angles (15°, 30°, 45° and 60°) and acceleration pressures (1.5, 3 and 4 bar) by using 80 mesh and 180 mesh sized erodent particles (garnet). The erosion rates of aluminum alloy samples were calculated depending on the erosion parameters. The erosion rates of the samples have varied dramatically depending on particle impingement angle, acceleration pressure and erodent particle size. The maximum erosion rates were observed at 15° impingement angles at all acceleration pressures and particle sizes. Moreover, erosion rates of the samples were increased with increases in acceleration pressure at all particle impingement angles and particle sizes. On the other hand, erosion rates of the samples decrease with increase in erodent particle sizes. Hence, maximum erosion was observed when the aluminum alloy eroded at 15° impingement angle and 4 bar pressure by using 180 mesh erodent particles. Finally, the eroded surfaces of the samples were analyzed by using scanning electron microscope. The surfaces of the samples were also investigated by using energy dispersive X-ray analysis in scanning electron microscopy studies. Microcutting and microploughing erosion mechanisms were observed at 15° and 30° impingement angles, while deep cavities and valleys formed due to plastic deformation were observed at 45° and 60° impingement angles. Moreover, embedded erodent particles were clearly detected on the surfaces of the samples by energy dispersive X-ray analysis.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 2; 523-525
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Early Design Stage of the MsAa-4 Mössbauer Spectrometer
    Autorzy:
    Błachowski, A.
    Ruebenbauer, K.
    Żukrowski, J.
    Górnicki, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1811903.pdf
    Data publikacji:
    2008-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.80.+y
    07.85.Nc
    29.85.Ca
    Opis:
    Entirely new Mössbauer spectrometer MsAa-4 is currently under design and construction. New features as compared to the basic features of the previous generation MsAa-3 spectrometer could be summarized as follows. Completely digital processing of the γ-ray detector signal beyond the Gaussian shape filter/amplifier is to be implemented. The spectrometer is going to be able to accommodate external multiple detector heads. One could collect simultaneously up to 128 γ-ray spectra in 16384 channels of 32-bit each and up to 512 Mössbauer spectra in 4096 channels of 32-bit each provided the proper external multiple detector head is used. The count-rate per single detector is limited to about $10^5$ counts per second total. Improved precision of the reference function from 12-bit to 16-bit is to be provided. The reference function is stored in 8192 channels per complete cycle. Addition of the random noise to the reference corner prism of the Michelson-Morley calibration inteferometer is to be introduced to avoid spurious fringes due to the phase lock-up. Integrated universal temperature controller being able to use variety of the temperature sensors is to be interconnected with the proper spectrometer. The spectrometer is now a stand-alone network device as it is equipped with the Ethernet connection to the outside world. Modular design and use of the strict standards allows easy reconfiguration for other applications than the Mössbauer spectroscopy.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 6; 1707-1713
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of Gamma-ray Attenuation Coefficients at Different Energies in Amasya Marbles
    Autorzy:
    Mavi, B.
    Oner, F.
    Akkurt, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402432.pdf
    Data publikacji:
    2015-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    28.41.Qb
    07.85.Nc
    Opis:
    The linear attenuation coefficients of different marble samples (Perlato Beige, Regal Beige and Crema Siva Beige) produced in Amasya were measured. The measurements have been performed at the photon energies of 511, 835 and 1274 keV which were obtained using $\text{}^{22}Na$ and $\text{}^{54}Mn$ sources. The measurements have been performed using a gamma spectrometer which contains 3"×3" NaI(Tl) detector connected to 16384 channel Multi-Channel-Analyser (MCA).
    Źródło:
    Acta Physica Polonica A; 2015, 128, 2B; B-395-B-396
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Asymmetry of 1 nm XRD reflection and measurement of illite crystallinity
    Autorzy:
    Wang, Hejing
    Zhou, Jian
    Powiązania:
    https://bibliotekanauki.pl/articles/1112783.pdf
    Data publikacji:
    2016-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    07.85.Nc
    07.85.Jy
    07.85.Fv
    Opis:
    Theoretically the X-ray emission is subjected to the Gaussian distribution and is symmetric. An X-ray diffraction peak should be symmetric, too. However all illite 1 nm (interplanar distance) peaks used for measurement of illite crystallinity (IC) are practically asymmetric. Our experimental results prove that any X-ray diffraction peak in low diffraction angle segment appears asymmetric if the diffractometer is running with a slit-fixed system. However, if the diffractometer is running with an auto-adjustable-slit system and the illumination length is fixed, the X-ray diffraction peak in low diffraction angle segment is symmetric. Those peaks derived from synchrotron radiation are symmetric in all angle ranges. The asymmetric degree (AsD) of a X-ray diffraction peak is subjected to the ratio of integrated intensities on lower and higher diffraction angle sides which are related to the X-ray illuminating length (area) on the sample. From the expression of illuminating length it is derived that with increasing diffraction angle the illuminating length decreases and therefore a X-ray diffraction peak is always asymmetric. The relationship between AsD and IC can be expressed as AsD = 0.239IC + 0.999, When illite/smectite mixed-layer phase presents the asymmetry of the illite 1 nm X-ray diffraction peak will be obviously higher than usual case and induces unusually larger IC value.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 4; 886-888
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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