Temat: 42.55.-f - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Optoacoustic Measurements for Small-Volume Liquid Samples
Autorzy:: Egerev, S.
Powiązania:: https://bibliotekanauki.pl/articles/1377936.pdf
Data publikacji:: 2015-01
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 43.35.Bf
43.35.Sx
05.70.-a
42.40.My
42.55.-f
Opis:: High sensitivity of optoacoustic measurement method makes it possible to use it for the analysis of the liquid samples having microliter volume. The core of any measurement optoacoustic system is represented by a so-called optoacoustic cell. The paper deals with a layered prism optoacoustic cell. It is well-suited for the small-volume sample analysis. In the paper, laser-induced elastic pulse in the layered prism cell is examined at the stage of its generation, at the stage of its propagation through the body of the cell, and at the stage of the wideband pick-up with the piezoelectric transducer. This pulse serves to determine trace concentrations of various impurities in the sample. The optimization of layered prism cell parameters is proposed. Figures of merit of optoacoustic determination of lipopolysaccharides in the liquid small-volume sample with the use of the optimized layered prism cell are evaluated as an example.
Źródło:: Acta Physica Polonica A; 2015, 127, 1; 10-14
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: LO-Phonon Band Filling by Means of Charge Carriers Accelerated in Electric Fields
Autorzy:: Raguotis, R.
Brazis, R.
Powiązania:: https://bibliotekanauki.pl/articles/1506223.pdf
Data publikacji:: 2011-02
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 78.45.+h
78.30.-j
42.55.-f
72.10.-d
72.20.Ht
Opis:: Electron and phonon distribution in momentum space is modeled using Monte Carlo method. Calculated LO phonon distribution in zinc-blende GaN deviates dramatically from the thermal equilibrium (Planck) function, and well coincides with the phonon number elucidated from the existing anti-Stokes Raman scattering experiments.
Źródło:: Acta Physica Polonica A; 2011, 119, 2; 247-249
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: Thermal Wave Measurements with a Mirage Detection for Investigation of Thermal Diffusivity of $GdCa_4O(BO_3)_3$ Single Crystals
Autorzy:: Bodzenta, J.
Kaźmierczak-Bałata, A.
Łukasiewicz, T.
Hofman, B.
Kucytowski, J.
Powiązania:: https://bibliotekanauki.pl/articles/1811523.pdf
Data publikacji:: 2008-12
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 42.55.Tv
42.70.Hj
65.40.-b
66.30.Xj
66.70.-f
Opis:: Single crystals of $GdCa_4O(BO_3)_3$ were examined to determine their thermal properties. Samples were grown by the Czochralski pulling technique. There were three types of samples: a pure crystal, the crystal doped with neodymium (4 at.% of Nd), and the third one doped with ytterbium (7 at.% of Yb). All samples were rectangular prisms with edges parallel to the axes of the optical indicatrix X, Y, Z (principal axes). The thermal diffusivity was determined by means of the thermal wave method with the optical detection of the temperature disturbance based on a mirage effect. Experimental results showed anisotropy of the thermal diffusivity. The thermal diffusivity along Y direction has the highest value while values obtained in X and Z axes are much lower. Dopants cause decrease in the thermal diffusivity for all investigated directions.
Źródło:: Acta Physica Polonica A; 2008, 114, 6A; A-27-A-32
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 4.

Tytuł:: Crystal structure of the high temperature phase of strontium barium niobate
Autorzy:: Paszkowski, R.
Zubko, M.
Wokulska, K.
Kusz, J.
Dec, J.
Powiązania:: https://bibliotekanauki.pl/articles/1058111.pdf
Data publikacji:: 2016-10
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 42.70.Mp
77.84.Dy
61.50.-f
71.55.Jv
Opis:: Pure and undoped strontium-barium niobate Sr_{0.40}Ba_{0.60}Nb₂O₆ (SBN40) single crystals grown by the Czochralski method were investigated by single crystal X-ray diffraction methods. The study below T_{C} (429 K for SBN40) confirmed the structure with P4bm space group. Above this temperature the structure transforms into the paraelectric, centrosymmetric one with P4/mbm space group. Analysis of the recorded diffraction patterns allowed to observe several signs of crystal structure modulation. On the registered diffraction images satellite reflections were found. A modulation vector q=(δ,±δ,), where δ=0.3075(6) (at room temperature) was found and it was similar to that occurring in the SBN61. In addition, above the phase transition temperature on the (hk) planes with l integer a weak diffuse scattering was observed.
Źródło:: Acta Physica Polonica A; 2016, 130, 4; 856-858
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

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