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Wyszukujesz frazę "76.60.-k" wg kryterium: Temat


Tytuł:
Relaxation of $\text{}^{53}$Cr Spin Echo Signals in Cd$\text{}_{0.985}$Ag$\text{}_{0.015}$Cr$\text{}_{2}$Se$\text{}_{4}$
Autorzy:
Abelyashev, G. N.
Berzhansky, V. N.
Polulyakh, S. N.
Sergeev, N. A.
Powiązania:
https://bibliotekanauki.pl/articles/2013365.pdf
Data publikacji:
2000-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.20.+q
76.60.-k
76.60.Lz
Opis:
The frequency dependences of the relaxation times of NMR spin echo signals of quadrupole nuclei $\text{}^{53}$Cr at t$\text{}_{e}$=τ and t$\text{}_{e}$=3τ in ferromagnetic semiconductor Cd$\text{}_{0.985}$Ag$\text{}_{0.015}$Cr$\text{}_{2}$Se$\text{}_{4}$ were investigated at temperature 4.2 K. It was shown that there are two kinds of the quadrupole nuclei $\text{}^{53}$Cr, which have quite different relaxation times. The existence of two kinds of the nuclei $\text{}^{53}$Cr was connected with doping of the cadmium selenochromite with Ag$\text{}^{+}$ ions.zap
Źródło:
Acta Physica Polonica A; 2000, 97, 5; 753-756
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Solid State ¹³C Nuclear Magnetic Resonance Study of Morphology and Molecular Mobility in Quenched Poly(3-hydroxybutyrate)
Autorzy:
Baran, A.
Vrábel, P.
Olčák, D.
Powiązania:
https://bibliotekanauki.pl/articles/1032243.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.41.+e
81.05.Lg
76.60.-k
74.25.nj
Opis:
Single pulse magic angle spinning ¹³C NMR spectra and the carbon spin-lattice relaxation times T₁(¹³C) were used for the study of morphology and molecular mobility in poly(3-hydroxybutyrate) quenched in cold water after melting in a twin-screw extruder. The crystallinity of the quenched sample was found to be comparable with that of virgin material, and the decrease in dimensions of the crystallites grown after quenching was deduced from the single pulse magic angle spinning ¹³C NMR spectra. The spin-lattice relaxation curves for the carbons of the CO, CH, CH₂ and CH₃ groups were found to be bi-exponential, which enables the molecular mobility within crystalline and amorphous domains to be studied. The spin-lattice relaxation times T₁(¹³C) estimated for the carbons of the CO, CH, CH₂ groups show the chain mobility enhancement within crystalline domains of the quenched sample, but the influence of the quenching on the CH₃ group rotation and on the main chain motion within amorphous regions was not observed.
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 1144-1146
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Sample Rotation on the Shape of the Free Induction Decay
Autorzy:
Blicharska, B.
Kruk, D.
Powiązania:
https://bibliotekanauki.pl/articles/1929572.pdf
Data publikacji:
1993-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.60.-k
Opis:
Free induction decay is calculated at the presence of rotation of a liquid sample in a static magnetic field with a constant gradient.
Źródło:
Acta Physica Polonica A; 1993, 84, 2; 321-325
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nuclear SPin Relaxation in Periodically Perturbed Systems. III. The Relaxation in the Presence of Double Rotation
Autorzy:
Blicharski, J.
Jasiński, G.
Powiązania:
https://bibliotekanauki.pl/articles/1924283.pdf
Data publikacji:
1992-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.60.-k
Opis:
The effective spin relaxation times are calculated in the presence of double rotation in the weak collision case.
Źródło:
Acta Physica Polonica A; 1992, 82, 6; 993-997
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nuclear Spin Relaxation in Periodically Perturbed Systems
Autorzy:
Blicharski, J. S.
Wolak, A.
Powiązania:
https://bibliotekanauki.pl/articles/1887459.pdf
Data publikacji:
1991-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.60.-k
Opis:
The effective relaxation time T$\text{}_{2e}$ is calculated in the weak collision case for a system of identical nuclear spins perturbed by periodic sequences of r.f. pulses and dipole-dipole and quadrupole interactions.
Źródło:
Acta Physica Polonica A; 1991, 79, 4; 591-598
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nuclear Spin Relaxation in Periodically Perturbed Systems. II. Like and Unlike Spins
Autorzy:
Blicharski, J. S.
Wołak, A.
Powiązania:
https://bibliotekanauki.pl/articles/1920949.pdf
Data publikacji:
1992-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.60.-k
Opis:
The effective relaxation time T$\text{}_{2e}$ is calculated in the weak collision case for a system consisting of resonant nuclear spins I and nonresonant spins S, perturbed by periodic sequences of r.f. pulses and dipole-dipole interactions.
Źródło:
Acta Physica Polonica A; 1992, 82, 3; 511-515
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nuclear Spin Relaxation in Periodically Perturbed Systems IV. The Relaxation in the Presence of Double Rotation and Pulse Sequence
Autorzy:
Blicharski, J. S.
Jasiński, G.
Klose, G.
Powiązania:
https://bibliotekanauki.pl/articles/1931829.pdf
Data publikacji:
1994-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.60.-k
Opis:
The effective relaxation times are calculated in the weak collision case for the system of identical nuclear spins perturbed by double rotation, periodic sequences of r.f. pulses and spin interactions.
Źródło:
Acta Physica Polonica A; 1994, 86, 6; 1001-1005
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamic Disorder in Perovskites: Local Symmetry Breaking at the Sr Site in SrTiO$\text{}_{3}$
Autorzy:
Blinc, R.
Zalar, B.
Laguta, V. V.
Zidanšek, A.
Powiązania:
https://bibliotekanauki.pl/articles/2043382.pdf
Data publikacji:
2005-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.84.Dy
76.60.-k
Opis:
A-site symmetry breaking in the macroscopically cubic paraelectric phase of SrTiO$\text{}_{3}$ was observed by quadrupole perturbed $\text{}^{87}$Sr NMR. The local symmetry breaking at the A (Sr) site is connected with slow and biased disorder dynamics similarly as at the B (Ti) site.
Źródło:
Acta Physica Polonica A; 2005, 108, 1; 7-11
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mobile NMR for Analysis of Polyethylene Pipes
Autorzy:
Blümich, B.
Casanova, F.
Buda, A.
Kremer, K.
Wegener, T.
Powiązania:
https://bibliotekanauki.pl/articles/2043383.pdf
Data publikacji:
2005-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.Lg
82.35.Lr
76.60.-k
Opis:
NMR relaxometry is a suitable tool to determine the morphology of semi-crystalline polymers by its ability to discriminate between rigid, mostly crystalline and soft, usually amorphous material. The NMR-MOUSE$\text{}^{®}$ (nuclear magnetic resonance mobile universal surface explorer) was explored in this work to supply morphological data of poly(ethylene) pipes nondestructively. PE-100 pipes were investigated in the new state, after squeezing them flat, and after annealing well below the glass temperature. Furthermore, the change in morphology induced by a pressure load from the inside and a point load from the outside was investigated as a function of depth, and the morphology change across a welding line was imaged. A shear-band was detected by destructive high-field NMR imaging in an area of severe deformation of a pipe, where an anomalous depths profile was observed by the NMR-MOUSE. These results demonstrate that the NMR-MOUSE is a suitable tool for non-destructive state assessment of polymer pipes on the basis of laboratory reference data.
Źródło:
Acta Physica Polonica A; 2005, 108, 1; 13-23
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of Hyperfine Interactions to Surface Investigations
Autorzy:
Budzyński, M.
Sarzyński, J.
Wasiewicz, R.
Powiązania:
https://bibliotekanauki.pl/articles/1929322.pdf
Data publikacji:
1993-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
63.35.-p
76.80.+y
76.60.-k
Opis:
In this article the principles of measurements of hyperfine interaction parameters at a given depth in a sample are presented. The advantages and the limitations of the Mössbauer spectroscopy, perturbed angular correlations and nuclear magnetic resonance are described.
Źródło:
Acta Physica Polonica A; 1993, 83, 5; 643-649
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Antisite Defects in Epitaxial Films of Lutetium Doped Yttrium Iron Garnets Studied by Nuclear Magnetic Resonance
Autorzy:
Chlan, V.
Štěpánková, H.
Englich, J.
Řezníček, R.
Kouřil, K.
Kučera, M.
Nitsch, K.
Powiązania:
https://bibliotekanauki.pl/articles/1534129.pdf
Data publikacji:
2010-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Gg
76.60.-k
76.60.Lz
68.35.Dv
68.55.Ln
Opis:
Series of lutetium doped yttrium iron garnet films is studied by means of $\text{}^{57}Fe$ nuclear magnetic resonance. Satellite spectral lines are resolved and identified in the spectra and concentrations of lutetium in dodecahedral sites as well as yttrium/lutetium antisite defects in octahedral sites are estimated. Compared to yttrium, lutetium cations are found to have stronger disposition towards creating the antisite defects.
Źródło:
Acta Physica Polonica A; 2010, 118, 5; 846-847
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
$\text{}^{13}$C High Resolution NMR Study of Methyl-Diethyl Sulfonium TCNQ 1:2 Complex
Autorzy:
Firlej, L.
Pęcherz, J.
Bernier, P.
Powiązania:
https://bibliotekanauki.pl/articles/1933380.pdf
Data publikacji:
1995-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.60.-k
76.30.-v
Opis:
Solid state high resolution $\text{}^{13}$C NMR studies of a 1 : 2 charge transfer complex of TCNQ with diethyl-methyl sulfonium S + Et$\text{}_{2}$Me(TCNQ)$\text{}_{2}$ are presented. The metallic shifts of TCNQ resonances are interpreted as due to the Pauli paramagnetism of conducting electrons and quantitatively connected with inhomogeneous spin density distribution over (TCNQ2)¯ dimer. A singularity of NMR parameters at T = 330 K is observed and described as a structural phase transition occurring in the S + Et$\text{}_{2}$Me cation sublattice.
Źródło:
Acta Physica Polonica A; 1995, 87, 4-5; 829-834
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Molecular Reorientations οf N-n-Hexyltetrachlorophthalimide Studied by $\text{}^1H$ NMR
Autorzy:
Hołderna-Natkaniec, K.
Jurga, K.
Woźniak-Braszak, A.
Walczak, A.
Powiązania:
https://bibliotekanauki.pl/articles/1538203.pdf
Data publikacji:
2010-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
07.05.Tp
31.15.E-
33.20.Ea
64.70.K-
76.60.-k
Opis:
The spin-lattice relaxation times $T_{1}$ and the second moment of $\text{}^{1}H$ NMR line have been employed to study the internal dynamics of protons of N-n-hexyl-tetra-chloro-phthali-mides in the temperature range 80-350 K. The model of internal reorientations has been proposed.
Źródło:
Acta Physica Polonica A; 2010, 117, 4; 537-548
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Estimation of the Degree of Crystallinity of Partially Crystalline Polypropylenes Using $\text{}^{13}C$ NMR
Autorzy:
Hronský, V.
Koval'aková, M.
Vrábel, P.
Uhrínová, M.
Olčák, D.
Powiązania:
https://bibliotekanauki.pl/articles/1378162.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.41.+e
76.60.-k
81.05.Lg
Opis:
The paper deals with a method for the estimation of the degree of crystallinity for partially-crystalline isotactic-polypropylenes (i-PP) using high-resolution solid-state $\text{}^{13}C$ NMR. For this purpose direct polarization $\text{}^{13}C$ MAS NMR spectra were measured for i-PP samples with different degrees of crystallinity at 98°C. The areas beneath the resonance lines in these spectra correspond to the number of carbons in particular functional groups, while the widths and shapes of the lines reflect the degree of crystallinity, crystalline modifications, distribution of chain conformations and the chain mobility. The $\text{}^{13}C$ MAS NMR spectra, measured using appropriate combination of delay time and high proton decoupling field, made it possible to detect only amorphous domains in the sample. This enabled identification of the lines associated with the amorphous domains in the complete $\text{}^{13}C$ MAS NMR spectra and provided sufficient information for reliable estimation of the degree of crystallinity. The heteronuclear Overhauser enhancement of the $\text{}^{13}C$ NMR signals due to short delay time was taken into account in our calculations.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 409-410
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Proton and Deuteron Relaxation Study of Molecular Dynamics in Lysozyme Solutions
Autorzy:
Kakule, J. F.
Węglarz, W. P.
Shenoy, R. K.
Sharp, A. R.
Peemoeller, H.
Powiązania:
https://bibliotekanauki.pl/articles/2014096.pdf
Data publikacji:
2000-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.60.-k
87.15.-v
Opis:
A nuclear magnetic resonance spin-lattice relaxation dispersion study of the relaxation of several magnetization components in both natural and deuterated lysozyme solutions was undertaken at 20°C. Proton and deuteron resonances were employed. The two-dimensional time evolution of the magnetization and the spin-spin relaxation were analyzed. In addition, an isotopic dilution study was performed at 5 and 30.6MHz. The results indicate that the water proton spin-lattice relaxation rate which arises from intermolecular relaxation between the water protons and the lysozyme protons represents a relatively strong relaxation mechanism. A model for the dynamics of the water molecules, consistent with the proton and deuteron dispersions as well as with the isotopic dilution results, is presented.
Źródło:
Acta Physica Polonica A; 2000, 98, 1-2; 131-152
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł

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