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Wyświetlanie 1-15 z 70
Tytuł:
Non-Contact Luminescence Lifetime Microthermometry using Scintillation Sensors
Autorzy:
Mykhaylyk, V.
Kraus, H.
Wagner, A.
Powiązania:
https://bibliotekanauki.pl/articles/1030994.pdf
Data publikacji:
2018-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Ps
Opis:
The paper describes an original technique for non-contact in situ monitoring of the temperature developed for experiments in a vacuum environment at the tender X-ray beamline I23 of the Diamond Light Source. The sample temperature is established by determining the luminescence decay constant of a Bi₄Ge₃O₁₂ (BGO) scintillation sensor. BGO is ideally suited for a temperature range of 30 K to 130 K, in which its decay constant shows a strong temperature dependence. The principle of the method, system design and application examples are discussed and the performance and potential of the technique is assessed.
Źródło:
Acta Physica Polonica A; 2018, 133, 4; 1108-1111
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chemiluminescence Used in Biochemical Investigations. An Application of the Lanthanide Ions as a Chemiluminescent Probe
Autorzy:
Elbanowski, M.
Staniński, K.
Kaczmarek, M.
Powiązania:
https://bibliotekanauki.pl/articles/1929807.pdf
Data publikacji:
1993-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.60.Ps
Opis:
This article concerns problems related to chemiluminescence and briefly fluorescence, which will be discussed. It also gives a review of application of the chemiluminescent method in chemistry, biology and medicine, in the absence of lanthanide ions and in their presence.
Źródło:
Acta Physica Polonica A; 1993, 84, 5; 993-1002
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of N$\text{}_{3}^{-}$ Ions on Chemiluminescence of the Eu(II)/Eu(III)-H$\text{}_{2}$O$\text{}_{2}$ System
Autorzy:
Elbanowski, M.
Staninski, K.
Kaczmarek, M.
Lis, S.
Powiązania:
https://bibliotekanauki.pl/articles/1945476.pdf
Data publikacji:
1996-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.60.Ps
78.55.-m
Opis:
The basic system of chemiluminescence investigations of relevant biological and inorganic compounds consists of Eu(II)/Eu(III) - H$\text{}_{2}$O$\text{}_{2}$. In these studies the increase in Eu(III) ion emission intensity usually results from an effective complexation reaction. In the present study, the N$\text{}_{3}^{-}$ ions are used as a ligand. The increase in the chemiluminescence intensity of the Eu(III) ion, the pH influence (in the range of 4.5-7.5) on the chemiluminescence intensity of the Eu(III) ion, as well as the quenching of the $\text{}^{5}$D$\text{}_{0}$ excited state of the Eu(III) ion are observed due to N$\text{}_{3}^{-}$ complexation. Taking into account the well-known Fenton system [Fe(II)/Fe(III) - H$\text{}_{2}$O$\text{}_{2}$], containing additionally the N$\text{}_{3}^{-}$, Eu(III) or Sm(III) ions, we found that the Eu(III) or Sm(III) ions were excited as a result of energy transfer process. A mechanism of the studied reactions is proposed.
Źródło:
Acta Physica Polonica A; 1996, 90, 1; 101-108
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research and Development of $ZnBO_{4}$ (B = W, Mo) Crystal Scintillators for Dark Matter and Double Beta Decay Searching
Autorzy:
Dubovik, A.
Vostretsov, Yu.Ya.
Grinyov, B.
Danevich, F.
Kraus, H.
Nagornaya, L.
Mikhailik, V.
Tupitsyna, I.
Powiązania:
https://bibliotekanauki.pl/articles/1549650.pdf
Data publikacji:
2010-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.10.Fq
78.70.Ps
Opis:
Oxide crystal scintillators play a considerable role in fundamental and applied researches. However, working out of new generation of high-sensitivity equipment and new methods of research puts higher requirements. The $ZnBO_{4}$ (B = W, Mo) crystals were grown from charge in platinum crucibles with high frequency heating, using the Czochralski method. The raw powder with optimum composition was prepared by solid phase high temperature synthesis using ZnO and $BO_{3}$ (B = W, Mo) with 4-5N purity. Single crystals with sizes up to ∅ 50 × 100 mm were grown and scintillation elements of various sizes and shapes (cylinders, rectangular and hexahedron prisms) were produced. High spectrometric characteristics were obtained for $ZnWO_{4}:R$ = 8-10% under excitation by $\text{}^{137}Cs (E_{γ}$=662 keV), low radiation background (less than 0.2 mBq/kg) and low afterglow (0.002%, 20 ms after excitation). The obtained results demonstrate good prospects for $ZnWO_{4}$ and ZnMoO_{4} crystal scintillators for application in low-count rate experiments, searching for double beta decay processes, interaction with dark matter particles, and also studies of rare decay processes. The material has also a good potential for application in modern tomography, scintillation bolometers and for other major researches using scintillators.
Źródło:
Acta Physica Polonica A; 2010, 117, 1; 15-19
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Surface Composition of CIS Compound Affected by Xe⁺ Irradiation
Autorzy:
Tashlykov, I.
Zukowski, P.
Silvanovich, D.
Gremenok, V.
Powiązania:
https://bibliotekanauki.pl/articles/1402236.pdf
Data publikacji:
2015-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.37.Ps
06.30.Bp
Opis:
The paper presents the results of investigation of element composition of CuInSe₂ (CIS) compounds obtained by vertical Bridgman technique and on a glass substrate by the thermal deposition of Cu-In thin films with the subsequent annealing in selenium vapour. The depth profile distribution of elements in these samples using the Rutherford backscattering spectrometry/channeling technique in conjunction with the RUMP code simulation is also discussed.
Źródło:
Acta Physica Polonica A; 2015, 128, 5; 927-930
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
SPM Characterization of Titanium Disilicide Nanostructures Grown on a Ni-Modified Si(100) Substrate
Autorzy:
Koczorowski, W.
Bazarnik, M.
Czajka, R.
Powiązania:
https://bibliotekanauki.pl/articles/1493616.pdf
Data publikacji:
2011-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.37.Ef
68.37.Ps
Opis:
The paper presents our recent investigations of the early stage growth of titanium silicides on a modified Si(100) substrate. The substrate was modified by deposition of a minute amount of Ni atoms, and the subsequent flash annealing. This process led to the creation of parallel defect lines on the Si(100) surface. We expected TiSi_2 to form elongated structures on top and/or between the defect lines. Though this idea failed, stable nanostructures were observed and characterized using scanning probe microscopy (scanning tunneling microscopy and atomic force microscopy) methods.
Źródło:
Acta Physica Polonica A; 2011, 120, 3; 480-484
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Elemental Composition, Topography and Wettability of $Pb_{x}Sn_{1 - x}S$ Thin Films
Autorzy:
Tashlykov, I.
Turavets, A.
Gremenok, V.
Żukowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/1366292.pdf
Data publikacji:
2014-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.37.Ps
06.30.Bp
Opis:
PbSnS thin films were prepared by hot-wall vacuum evaporation. The Rutherford backscattering technique was employed for the investigation of $Pb_{x}Sn_{1 - x}S$ thin films composition. With a help of atomic force microscopy the main stages in the development of the thin films were characterized. Contact angle measurements of water drop on $Pb_{x}Sn_{1 - x}S$ thin films have been conducted on our original setup.
Źródło:
Acta Physica Polonica A; 2014, 125, 6; 1339-1343
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure and Cathodoluminescence of Y₂O₃:Eu Thin Films obtained at Different Conditions
Autorzy:
Bordun, I.
Bordun, O.
Kukharskyy, I.
Tsapovska, Zh.
Powiązania:
https://bibliotekanauki.pl/articles/1030939.pdf
Data publikacji:
2018-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.37.Ps
78.60.Hk
81.15.-z
Opis:
The structure of the surface and spectra of the cathodoluminescence of Y₂O₃:Eu thin films when changing the activator concentration in the range 1.0-7.5% by mole obtained by RF sputtering were investigated. On the base of the shape of the cathodoluminescence spectra at different concentrations of the activator, the possibility of irregular solutions creating of yttrium and europium oxides and the structural features of the small and large crystallites forming the film Y₂O₃:Eu is shown. The dependence of the cathodoluminescence intensity on the energy of the exited electrons and current density of electron irradiation was established.
Źródło:
Acta Physica Polonica A; 2018, 133, 4; 914-917
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of the Properties of Molybdenum Nanocube Crystals Deposited by Dc Sputtering
Autorzy:
Borghei, S.
Powiązania:
https://bibliotekanauki.pl/articles/1398729.pdf
Data publikacji:
2016-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.15.Cd
81.07.-b
68.37.Ps
Opis:
Cubic molybdenum (Mo) nanocubes were deposited on a silicon substrate via dc sputtering. This method has been widely used to prepare the thin films containing the crystalline nanostructures. We used this approach to deposition and after that, the characterization of Mo nanocubes. Formation of these cubes was investigated by atomic force microscopy, X-ray diffractometry and four point probes, respectively. First, the mean sizes of the molybdenum cubic nanoparticles were studied under different Mo film thicknesses of 50, 80, 110, and 140 nm. Structural characterizations indicate that the as-deposited Mo nanocubes have different side-length and their distribution over the surface has been measured, separately. In the next step, according to the X-ray diffractometry, Mo crystallites were all along the (110) crystal planes of cubic structure. Finally, electrical characterizations reported that at a deposition power of 54 W, our samples exhibit an electrical resistivity, in the range of 0.92×10¯⁴ Ω cm to 0.58×10¯⁴ Ω cm.
Źródło:
Acta Physica Polonica A; 2016, 129, 4; 607-609
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Giant Magnetoelectricity in Aluminium Substituted Y-Hexaferrites
Autorzy:
Novák, P.
Chlan, V.
Knížek, K.
Powiązania:
https://bibliotekanauki.pl/articles/1506886.pdf
Data publikacji:
2010-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.85.+t
71.20.Ps
75.50.Gg
Opis:
The electron structure of Al containing Y-hexaferrite that exhibits the giant magnetoelectricity is calculated. Results show strong preference of Al for octahedral sites. Orbital moment of some of the iron ions is found to be unusually large.
Źródło:
Acta Physica Polonica A; 2010, 118, 5; 723-724
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Surface Morphological Properties of Mo-Based Thin Films on Glass
Autorzy:
Tashlykov, I.
Turavets, A.
Zukowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/1400442.pdf
Data publikacji:
2013-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
88.40.jm
68.08.Bc
68.37.Ps
Opis:
In that report we observe the initial stages in the process of film growth at different irradiation doses. Investigations of influence of Mo deposition on glass substrates by means of self-ion-assisted deposition on its topography (atomic force microscopy) and wettability (sessile-drop method) were carried out. It was found out that with an increase of the irradiation dose, the average roughness and the contact angle increases rapidly at first and then decrease. 2.45-2.77 increase in the contact angle of water when Mo-based coating was deposited on the glass was observed.
Źródło:
Acta Physica Polonica A; 2013, 123, 5; 840-842
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
AFM Observation of Fe-Al Single Crystals under in situ Deformation
Autorzy:
Veselý, J.
Cieslar, M.
Kopeček, J.
Powiązania:
https://bibliotekanauki.pl/articles/1419056.pdf
Data publikacji:
2012-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.35.bd
62.20.F-
68.37.Ps
Opis:
Fe-Al single crystals of three different compositions (20, 28 and 40 at.% Al) in single slip orientation were studied. Evolution of their surfaces during deformation at room temperature was observed in situ in atomic force microscope. Atomic force microscopy allows us to investigate slip lines on much finer scale than traditional optical observations. Wavy slip bands in $Fe-Al_{20},$ cross-slip in $Fe-Al_{28}$ and weak slip line texture in $Fe-Al_{40}$ are described. Post mortem observations of surfaces of $Fe-Al_{28}$ deformed at elevated temperatures (in the range of yield stress anomaly) are presented as well.
Źródło:
Acta Physica Polonica A; 2012, 122, 3; 618-621
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Energy Dissipation in the AFM Elasticity Measurements
Autorzy:
Klymenko, O.
Wiltowska-Zuber, J.
Lekka, M.
Kwiatek, W.
Powiązania:
https://bibliotekanauki.pl/articles/1809585.pdf
Data publikacji:
2009-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.37.Ps
87.10.Vg
87.15.La
Opis:
Nowadays, it is well established that changes of cell stiffness observed by atomic force microscopy are linked with the cell cytoskeleton. Its structural and functional alterations are underlying major diseases such as cancer, inflammation or neurodegenerative disorders. So far, the use of atomic force microscopy is mostly focused on the determination of the Young modulus using the modified Hertz model. It can quantitatively describe the elastic properties of living cells, however, its value is burdened by the fact that cells are neither isotropic nor homogeneous material. Often, during the atomic force microscopy measurements, the hysteresis between the loading and unloading curves are observed which indicates the dissipation of an energy. In our studies, the index of plasticity was introduced to enumerate such effect during a single loading-unloading cycle. As the results show, such approach delivers an additional parameter describing the mechanical state of cell cytoskeleton. The analysis was performed on test samples where the mechanical properties of the melanoma cells were changed by glutaraldehyde and cytochalasin D treatments. The non-treated cells were compared with fibroblasts.
Źródło:
Acta Physica Polonica A; 2009, 115, 2; 548-551
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructure and Thermally Stimulated Luminescence of β -Ga₂O₃ Thin Films
Autorzy:
Bordun, O.
Bordun, B.
Medvid, I.
Kukharskyy, I.
Powiązania:
https://bibliotekanauki.pl/articles/1052882.pdf
Data publikacji:
2018-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.37.Ps
78.60.-b
81.15.-z
Opis:
Thermally stimulated luminescence of X-ray irradiated β -Ga₂O₃ thin films was investigated. An analysis of the form of the elementary contours making the thermally stimulated luminescence curves shows that recombination processes at the thermally stimulated luminescence peaks with maxima at 77, 135, 178, and 235 K in thin films of β -Ga₂O₃ are described in terms of linear kinetics. The spectral composition of the thermally stimulated luminescence of the thin films was studied. Some methods are employed to determine the activation energies and frequency factors corresponding to the thermally stimulated luminescence peaks. It is established that the recombination processes occurring upon release of the trapping centers in thin films β -Ga₂O₃ are conditioned by diffusion-controlled tunneling recombination due to thermally-stimulated migration of V_{k}-centers.-
Źródło:
Acta Physica Polonica A; 2018, 133, 4; 910-913
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure properties of AlSi7Mg/SiC composite produced by stir casting method
Autorzy:
Cyboroń, J.
Karolus, M.
Putyra, P.
Dyzia, M.
Ratuszek, W.
Powiązania:
https://bibliotekanauki.pl/articles/1111951.pdf
Data publikacji:
2016-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.65.Ps
83.85.Hf
81.05.Mh
Opis:
The paper presents the structure studies on composites of aluminum alloy matrix with addition of silicon carbide phase (from 5 to 15 vol.% SiC and 10 vol.% SiC + 10 vol.% graphite) obtained by the stir casting method. The aim of this work is to determine the influence of the SiC content and electrical discharge machining processes on the phase composition, microstructure, and values of residual stresses. In order to determine the heterogeneity of the obtained materials, the X-ray diffraction analysis was performed in different sample orientations to the direction of the X-ray beam (perpendicular and parallel), using different geometries (the Bragg-Brentano and grazing incident X-ray diffraction). This work presents the results of the residual stress analysis in the tested composites generated by various content of SiC additives. Residual stresses were determined by both of the ın²ψ and g-ın²ψ X-ray methods. Obtained results shown the significant gradient of residual stress in all cases.
Źródło:
Acta Physica Polonica A; 2016, 130, 4; 969-971
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 70

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