Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

English (EN)·Polski (PL)·Yкраїнський (UK)
Przejdź do strony domowej biblioteki Centralna Biblioteka Wojskowa Link otwiera się w nowym oknie Logo biblioteki Prolib Integro - strona głównaCentralna Biblioteka Wojskowa

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

  Lista filtrów
Wyrównaj
Wyświetlanie 1-15 z 44
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 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:
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:
NMR Study of Ion Motions in [C(NH$\text{}_{2}$)$\text{}_{3}$]$\text{}_{3}$GaF$\text{}_{6}$
Autorzy:
Kozak, A.
Grottel, M.
Pająk, Z.
Powiązania:
https://bibliotekanauki.pl/articles/1928270.pdf
Data publikacji:
1993-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.60.-k
76.60.Es
Opis:
Proton and fluorine spin-lattice relaxation times as well as second moments were measured in guanidinium hexafluorogallate over a wide range of temperature. The analysis of all cross-relaxation effects occurring in the four unlike spin system revealed two cation motions and yielded their activation parameters. It was found that the anion size did not influence C$\text{}_{3}$ reorientation of cation nor isotropic reorientation of anion.
Źródło:
Acta Physica Polonica A; 1993, 83, 2; 219-225
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 Dynamics in Biological Systems Observed by NMR Relaxation in a Rotating Frame
Autorzy:
Wierzuchowska, D.
Skórski, L.
Blicharska, B.
Powiązania:
https://bibliotekanauki.pl/articles/1490095.pdf
Data publikacji:
2012-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.60.-k
76.90.+d
Opis:
NMR relaxation provides powerful tools for obtaining information on three-dimensional structures, dynamic properties and intermolecular interactions of biological macromolecules. One of these methods, called dispersion profile, is based on measuring the field dependence of spin-relaxation rates in the rotating frame, $R_{1ρ} = 1//T_{1ρ}$, in the presence of a low magnetic field $B_1$. In the presented study we use this method for investigation of molecular dynamics in protein samples. Dispersion profiles can be predicted theoretically and using two models, assuming either dipolar interaction between protons or power law dispersion, we have evaluated some molecular dynamic parameters of water adsorbed on protein surface. Our researches are focused on the connections of obtained parameters of molecular dynamics with conformation changes of protein. We have calculated the correlation times and power parameters for samples of lyophilized powder of albumins (egg white and bovine and rabbit blood serum) and lysozyme, as well as its aqueous solutions. Analysis of these parameters yields valuable information on the molecular nature of investigated biological systems. We also used this method to analyze experimental data of $T_{1ρ}$ obtained by other authors for bovine serum albumin and we have found good accordance with their conclusions concerning molecular dynamics of proteins.
Źródło:
Acta Physica Polonica A; 2012, 121, 2; 434-438
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Molecular Dynamics of Proteins Investigated by NMR Relaxation Methods
Autorzy:
Wierzuchowska, D.
Blicharska, B.
Powiązania:
https://bibliotekanauki.pl/articles/1360657.pdf
Data publikacji:
2014-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.60.-k
76.90.+d
Opis:
The nuclear magnetic resonance relaxation times of solvent water nuclei are known to decrease upon addition of diamagnetic solute protein. For this reason NMR relaxation methods are able to provide information on molecular dynamics changes of water protons and their interaction with macromolecules' surfaces. We present results of measurements of relaxation rates $R_1$ = 1/$T_1$, $R_2$ = 1/$T_2$ and $R_{1ρ}$ = 1/$T_{1ρ}$ in the rotating frame for three proteins: chicken egg white lysozyme, egg white albumin, and bovine serum albumin, obtained at proton resonant frequency of 60 MHz. Besides the relaxation rates dependences on concentration in the 4-23% (g/100 g solution) range, the analysis of the Carr-Purcell-Meiboom-Gill CPMG multi-echo $T_2$ experiments with variable pulse rate τ was performed. The dependences of relaxation rates on protein concentration are linear at low concentration. When protein concentration increases the slope of the straight line rapidly changes at so-called "critical" concentration which depends on MW of the diluted protein. Investigated dispersion of $T_2$, obtained using the CPMG method with a variable pulse rate, for concentrations higher and lower than the "critical" one, exhibits unequal behavior. At high concentration one-exponential curves and at low concentration two-exponential curves correspond closely with experimental data. The obtained parameters of exponents allow an estimation of the ratio of the amount of water with the determined motion freedom, that is free and bounded water, in solution. We showed that the CPMG dispersion method applied to aqueous protein solutions may widen the current understanding of the nature of molecular dynamics of hydrated water protons in non-perturbed environment.
Źródło:
Acta Physica Polonica A; 2014, 125, 4; 907-910
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hyperfine Field in YIG with Charged Substitution
Autorzy:
Kohout, J.
Štĕpánková, H.
Englich, J.
Novák, P.
Kučera, M.
Nitsch, K.
Powiązania:
https://bibliotekanauki.pl/articles/2013158.pdf
Data publikacji:
2000-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.60.-k
75.50.Gg
Opis:
$\text{}^{57}$Fe NMR spectra were measured on thin films of yttrium iron garnet with divalent (Ca$\text{}^{2+}$) and tetravalent (Ge$\text{}^{4+}$) cation substitutions using the spin echo technique at 4.2 K. A series of Y$\text{}_{3-x}$Ca$\text{}_{x}$Fe$\text{}_{5-x}$Ge$\text{}_{x}$O$\text{}_{12}$ samples with 0 ≤ x ≤ 0.0 5 was prepared by an epitaxial growth from BaO/B$\text{}_{2}$O$\text{}_{3}$/BaF$\text{}_{2}$ flux on gadolinium gallium garnet substrate. Satellite lines corresponding to the iron ions having the Ge$\text{}^{4+}$ and Ca$\text{}^{2+}$ in their neighbourhood were identified. The sample with the germanium content of x(Ge) = 0.004 and (110) substrate orientation was used for a detailed study: NMR spectra of this sample were measured in an external magnetic field of 0.1 T applied along several directions in the plane of the film. The modification of the isotropic part and the anisotropy tensor of the hyperfine interaction caused by the Ge$\text{}^{4+}$ substituent were obtained from the experimental data. The results were compared with those previously reported for trivalent substitution (Ga$\text{}^{3+}$).
Źródło:
Acta Physica Polonica A; 2000, 97, 3; 519-522
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
$\text{}^{57}$Fe Hyperfine Field Anisotropy in Ferrites and its Relation to the Non-Uniformity of the Ionic Surrounding
Autorzy:
Štepánková, H.
Englich, J.
Kohout, J.
Powiązania:
https://bibliotekanauki.pl/articles/2013366.pdf
Data publikacji:
2000-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.60.-k
75.50.Gg
Opis:
The hyperfine field anisotropy tensors, obtained from analysis of $\text{}^{57}$Fe NMR spectra for iron sites in various magnetic oxides (barium hexaferrite, lithium spinel, magnetite and yttrium-iron garnet) were used to investigate the relation between the hf anisotropy and surrounding ionic arrangement. While a reasonable correlation has been found when the distribution of the nearest cations was considered, no correlation was obtained between the hyperfine field anisotropy and the positions of the nearest oxygen anions.z
Źródło:
Acta Physica Polonica A; 2000, 97, 5; 757-760
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
Tytuł:
An NMR study of Pr$\text{}_{0.5}$Ca$\text{}_{0.5}$Mn$\text{}_{1-x}$Ga$\text{}_{x}$O$\text{}_{3}$ (x=0 and 0.03)
Autorzy:
Oates, C. J.
Kapusta, Cz.
Riedi, P. C.
Sikora, M.
Zając, D.
Rybicki, D.
Martin, C.
Yaicle, C.
Maignan, A.
Powiązania:
https://bibliotekanauki.pl/articles/2037129.pdf
Data publikacji:
2004
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.60.-k
75.47.Gk
Opis:
An NMR study of polycrystalline Pr$\text{}_{0.5}$Ca$\text{}_{0.5}$Mn$\text{}_{1-x}$Ga$\text{}_{x}$O$\text{}_{3}$ (x=0 and 0.03) at 3 K is presented. Zero field spin-echo spectra of the Ga doped compound consist of an overlapping $\text{}^{69,71}$Ga signal at 74~MHz (hyperfine field of 5.3 T), a $\text{}^{55}$Mn double exchange line at 375 MHz (35.5 T) and a weak Mn$\text{}^{3+}$ signal between 400 and 550 MHz. Measurements in an applied field show a step-like increase in the double exchange line intensity, which corresponds to an increase in the amount of the ferromagnetic metallic phase. This coincides with a step-like feature in the bulk magnetization measurements. The effect is similar to that in the previous field dependent $\text{}^{55}$Mn NMR measurements of Pr$\text{}_{0.67}$Ca $\text{}_{0.33}$MnO$\text{}_{3}$. At the demagnetized and remanent state, a variation of spin- spin relaxation time, T$\text{}_{2}$, across the $\text{}^{55}$Mn line, due to the Suhl-Nakamura interaction is observed, which suggests that the ferromagnetic metallic double exchange regions, at liquid helium temperatures, are at least 4 nm in size.
Źródło:
Acta Physica Polonica A; 2004, 105, 1-2; 189-195
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:
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
Wyświetlanie 1-15 z 44

Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies