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Wyszukujesz frazę "87.15.rp" wg kryterium: Temat


Wyświetlanie 1-5 z 5
Tytuł:
Holographic Measurement of Dental Tissue Contraction and Stress, due to Postpolymerization Reaction
Autorzy:
Pantelić, D.
Blažić, L.
Savić-Šević, S.
Murić, B.
Vasiljević, D.
Panić, B.
Belić, I.
Powiązania:
https://bibliotekanauki.pl/articles/2047904.pdf
Data publikacji:
2007-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.40.Kw
87.85.G-
87.15.rp
87.10.Kn
Opis:
Polymerization contraction of dental photo-polymer composites induces internal stress, in a tooth cavity. This stress is measured indirectly by, first, holographic determination of tooth deformation, with consequent calculation of stress using finite element method. Real time holographic technique enabled observation of dental deformation in all stages of polymerization. Specially constructed blue-LED light source was used to polymerize photopolymer composite. We have found that polymerization continues even after illumination is over. Consequently, stress is increased, too.
Źródło:
Acta Physica Polonica A; 2007, 112, 5; 1157-1160
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Alginate Biopolymer Coatings Obtained by Electrophoretic Deposition on Ti15Mo Alloy
Autorzy:
Szklarska, M.
Dercz, G.
Simka, W.
Dudek, K.
Starczewska, O.
Łężniak, M.
Łosiewicz, B.
Powiązania:
https://bibliotekanauki.pl/articles/1360727.pdf
Data publikacji:
2014-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.18.Fx
87.85.J-
82.35.Pq
87.15.rp
81.15.-z
Opis:
In this work, the electrophoretic deposition method has been developed for the fabrication of bioactive alginate coatings on the surface of Ti15Mo implant alloy. Thin ZnO film was deposited cataphoretically as the interlayer prior to anaphoretic deposition of alginate (Alg) which was performed from aqueous solution containing 1 g $dm^{- 3}$ of NaAlg at room temperature. The deposition voltage and time varied in the range 20-50 V and 30-120 min, respectively. The microstructure of Alg coatings was studied by scanning electron microscope, and the surface roughness was analysed using atomic force microscopy. Structure was studied by grazing incidence X-ray diffraction. Chemical composition and functional group were examined using energy dispersive spectrometry and attenuated total reflectance Fourier transform infrared spectroscopy methods, respectively. It was found that controlling the deposition conditions it is possible to obtain amorphous Alg coatings of variable thickness and porosity. Mechanism of electrophoretic deposition of bioactive Alg coatings on the Ti15Mo alloy surface was discussed.
Źródło:
Acta Physica Polonica A; 2014, 125, 4; 919-923
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of the Heat Treatment on the Band Gaps in the Biopolymer Photonic Crystals
Autorzy:
Savic-Sevic, S.
Pantelic, D.
Jelenkovic, B.
Powiązania:
https://bibliotekanauki.pl/articles/1795629.pdf
Data publikacji:
2009-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.70.Qs
42.40.Pa
82.35.Pq
87.15.rp
Opis:
1D photonic crystal was fabricated in a dichromate-sensitized biopolymer using holography method. The effects of the temperature of the photonic crystal layer on the center of photonic band gaps were studied. We showed that the central wavelength of the band gap can be tuned by heating the photonic crystal layer. By applying such heat treatment, tuning of the position of the band gap for about 80 nm was obtained.
Źródło:
Acta Physica Polonica A; 2009, 116, 4; 645-646
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Protein Vibrations on Electron Transfer
Autorzy:
Babincová, M.
Babinec, P.
Powiązania:
https://bibliotekanauki.pl/articles/1929591.pdf
Data publikacji:
1993-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
82.20.Rp
34.70.+e
87.15.Da
Opis:
Using a double well model complemented with the third excited state it is shown that a new excited-state-induced protein vibration-mediated channel, with an electron transfer rate comparable to a standard tunneling rate may exist. This channel can become dominant at low temperatures.
Źródło:
Acta Physica Polonica A; 1993, 84, 2; 365-367
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Light Harvesting Process in Purple Bacteria
Autorzy:
Krueger, B. P.
Scholes, G. D.
Yu, J.- Y.
Fleming, G. R.
Powiązania:
https://bibliotekanauki.pl/articles/1993667.pdf
Data publikacji:
1999-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
87.15.Mi
82.20.Rp
42.50.Md
Opis:
We present and review the results of fluorescence upconversion and photon echo experiments, and $ab initio$ calculations performed in our group within the last few years with respect to the light harvesting process in purple bacteria. Carotenoids transfer energy to bacteriochlorophyll (BChl) mainly via the carotenoid S$\text{}_{2}$ → BChl Q$\text{}_{x}$ pathway on a ~100 fs timescale. This transfer is reasonably reproduced by considering the Coulombic coupling calculated using the transition density cube method which is valid at all molecular separations. Carotenoids may also serve a role in mediating B800 → B850 energy transfer in LH2 by perturbing the transition density of the B850 as shown by ab initio calculations on a supermolecule of two B850 BChls, one carotenoid and one B800 BChl. Further calculations on dimers of B850 BChl estimate the intra- and interpolypeptide coupling to be 315 and 245 cm$\text{}^{-1}$, respectively. These interactions are dominated by Coulombic coupling, while the orbital overlap dependent coupling is ~20% of the total. Photon echo peak shift experiments (3PEPS) on LH1 and the B820 subunit are quantitatively simulated with identical parameters aside from an energy transfer time of 90 fs in LH1 and ∞ in B820, suggesting that excitation is delocalized over roughly two pigments in LH1. 3PEPS data taken at room and low temperature (34 K) on the B800-B820 suggest that static disorder is the dominant mechanism localizing excitation in LH1 and LH2. We suggest that the competition between the delocalizing effects of strong electronic coupling and the localizing effects of disorder and nuclear motion results in excitation in the B850 and B875 rings being localized on 2-4 pigments within approximately 60 fs.
Źródło:
Acta Physica Polonica A; 1999, 95, 1; 63-83
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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