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Wyszukujesz frazę "33.25.+k" wg kryterium: Wszystkie pola

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    Wyświetlanie 1-14 z 14
    Tytuł:
    Single-Quantum NMR Spinning-Side-Band Patterns for Spin-3/2 System
    Autorzy:
    Lupulescu, A.
    Fechete, R.
    Demco, D. E.
    Cozar, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968465.pdf
    Data publikacji:
    1997-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    33.25.+k
    33.40.+f
    Opis:
    The NMR response of an isolated spin-3/2 system with an axially symmetric quadrupolar interaction under magic-angle sample spinning to an ideal radio-frequency pulse using irreducible tensor operators is evaluated analytically. The excited single-quantum spin coherences are modulated by the sample spinning. The effects of spinning frequency, quadrupole coupling constant and the orientation of quadrupolar interaction relative to rotor axis on the spinning-side-band patterns are simulated. High-resolution single-quantum spinning-side-band pattern detected for $\text{}^{23}$Na (I=3/2) nuclei in sodium nitrate powder is compared with the simulation based on the theory and the quadrupole coupling is estimated.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 6; 1125-1134
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Homonuclear Separated Local-Field Spectroscopy by Magnetization-Exchange NMR
    Autorzy:
    Demco, D.
    Filip, X.
    Filip, C.
    Chira, D.
    Cozar, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968466.pdf
    Data publikacji:
    1997-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    33.25.+k
    61.41.+e
    Opis:
    The possibility to perform homonuclear separated-local field NMR spectroscopy by magnetization-exchange is presented. Solid-state one-dimensional proton magnetization-exchange NMR is used to investigate intergroup residual dipolar couplings in cis-1,4-polybutadiene elastomer. A three-spin model is employed, in which the CH- and CH$\text{}_{2}$-protons are considered to be coupled by residual dipolar interactions. The magnetization-exchange process between the CH- and the CH$\text{}_{2}$-group in the regime of short mixing time provides valuable insight regarding molecular order. The spin-system response reflects well-localized dipolar interactions. The residual intergroup dipolar couplings are measured along the average polymer-chain direction for different temperatures. The dynamic order parameter along the chains is also evaluated.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 6; 1135-1149
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ortho-Positronium Lifetime As a Detector of Spin-Crossover
    Autorzy:
    Bokor, M.
    Marek, T.
    Süvegh, K.
    Böcskei, Z. S.
    Buschmann, J.
    Vértes, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2007920.pdf
    Data publikacji:
    1999-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.70.Bj
    36.10.Dr
    75.20.-g
    33.25.+k
    Opis:
    Positron lifetime parameters were measured for the spin-crossover complexes [Fe(R-1H-tetrazole)$\text{}_{6}$](BF$\text{}_{4}$)$\text{}_{2}$ (R = 1-ethyl, 1-n-propyl) and for the diamagnetic [Zn(1-n-propyl-1H-tetrazole)$\text{}_{6}$](BF$\text{}_{4}$)$\text{}_{2}$. Positronium forms with significant intensity in the studied compounds. The ortho-para conversion of ortho-positronium was used to follow the spin-crossover. Changes of the dynamic structure were found in the propyltetrazole complex between 150 K and 90 K.
    Źródło:
    Acta Physica Polonica A; 1999, 95, 4; 469-473
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Field Dependent Electron and Quadrupole Spin Relaxation: A Unified Treatment
    Autorzy:
    Kruk, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047257.pdf
    Data publikacji:
    2007-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    33.25.+k
    76.60.-k
    82.56.-b
    33.35.+r
    76.30.-v
    Opis:
    This article reviews recent theoretical treatments of field dependent relaxation processes in complex systems containing mutually coupled dipolar, quadrupole, and electron spins. The presented approaches are based on an analogy between the Hamiltonian formalisms for quadrupole and zero field splitting interactions. Limitations of the presented treatments, resulting from the validity conditions of the second-order perturbation theory are discussed in detail.
    Źródło:
    Acta Physica Polonica A; 2007, 111, 2; 215-238
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Theoretical Investigation of N-Methyl-N-(4-nitrobenzylidene) pyrazine-2-carbohydrazide: Conformational Study, NBO Analysis, Molecular Structure and NMR Spectra
    Autorzy:
    Günay, N.
    Tamer, Ö.
    Kuzalic, D.
    Avcı, D.
    Atalay, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398702.pdf
    Data publikacji:
    2015-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    31.15.A-
    31.15.ae
    31.15.E-
    33.25.+k
    31.50.Bc
    Opis:
    The crystal structure determination of the methylated pyrazine-2-carbohydrazide derivative, namely N-methyl-N'-(4-nitrobenzylidene)pyrazine-2-carbohydrazide were optimized to obtain its molecular geometric structure and electronic structures at the Hartree-Fock and density functional theory levels (B3LYP) with 6-311G(d,p) and 6-311++G(d,p) basis sets, using Gaussian 09W programme. The $\text{}^{1}H$ and $\text{}^{13}C$ nuclear magnetic resonance chemical shifts of the title molecule were calculated by using the gauge independent atomic orbital, continuous set of gauge transformations and individual gauges for atoms in molecules methods and were also compared with experimental values. The electronic properties high occupied and low unoccupied molecular orbitals energies were calculated and analyzed. Potential energy surface scan, natural population analysis and Mulliken atomic charges were investigated using theoretical calculations. A detailed molecular picture and intermolecular interactions arising from hyperconjugative interactions and charge delocalization of the molecule were analyzed using natural bond orbital analysis.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 3; 701-710
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spectroscopic Studies of Poly(ε-Caprolactone)/Sodium Montmorillonite Nanocomposites
    Autorzy:
    Krzaczkowska, J.
    Fojud, Z.
    Kozak, M.
    Jurga, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2043539.pdf
    Data publikacji:
    2005-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    91.60.-x
    71.20.Tx
    78.30.Jw
    36.20.-r
    33.25.+k
    61.10.-i
    Opis:
    Polymer-layered silicate nanocomposites belong to a new class of hybrid materials consisting of organic-synthetic polymer matrix and inorganic filler-layered structure clay minerals. The paper presents the results of FTIR, NMR, and SAXS studies of poly(ε-caprolactone)/sodium montmorillonite nanocomposites. We observed a correlation between the concentration of poly(ε-caprolactone) in nanocomposite samples and structural changes both of the clay mineral and the intercalated polymer. Stiffening of the clay structure appears as a result of poly(ε-caprolactone) intercalation into a clay structure. $\text{}^{27}$Al NMR studies indicated in nanocomposites two non-equivalent sites of aluminium ions, i.e. in octahedral and tetrahedral coordination, whereas in the montmorillonite clay structure the aluminium ions are located in the interlayer space too. We found also that the temperatures of structural changes and softening process of poly(ε-caprolactone) chains in the nanocomposites depend on the concentration of poly(ε-caprolactone).
    Źródło:
    Acta Physica Polonica A; 2005, 108, 1; 187-196
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of Photonic Crystal Fiber in Optical Fiber Current Sensors
    Autorzy:
    Barczak, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1417932.pdf
    Data publikacji:
    2012-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.70.-a
    42.79.Pw
    33.20.Kf
    42.25.Bs
    Opis:
    Optical fibers may be applied in the technique of measuring electric current, particularly as so-called optical current transducers. They are small in size, cheap, light and safe. Their sensitivity, however, connected with the Faraday effect, is rather poor, and they are also susceptible to considerable disturbances (deformations of the fibers). Their sensitivity can be increased by lengthening the path of effect, but this involves also an increase of noise and greater fluctuations of the measured signal due to changes of internal stresses induced by external factors. These negative phenomena can be reduced by applying fibers less sensitive to deformations. The author supposes that photonic crystal fiber with a glass core may display such properties. Orifices in the cladding can to some extent prevent the propagation of deformations from outside the core, and thus decrease the birefringence of the fiber induced by elastooptic effects. The paper presents preliminary measurements of typical photonic crystal fiber exposed to mechanical vibrations.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 5; 793-795
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetooptic Effects in the Photonic Crystal Fiber as a Function of the Polarization State
    Autorzy:
    Barczak, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1399333.pdf
    Data publikacji:
    2013-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    42.25.Bs
    42.79.Pw
    33.20.Kf
    42.70.-a
    Opis:
    In optical fibers there exists an optical birefringence induced by external factors and stress produced in technological processes. The induced birefringence makes difficult to apply optical fibers in heads of polarimetric sensors. It has been proposed to use a photonic crystal fiber working in an index guiding regime due to the small value of stress in a fiber core produced by internal and external factors. This article presents an expansion of our earlier investigations. The expansion consists of investigations concerning the influence of external magnetic field induction on the state of polarization of light in the function of an azimuth of the input linear polarization ϕ. On the basis of the resulting characteristics optimal working points of the tested fiber were determined.
    Źródło:
    Acta Physica Polonica A; 2013, 124, 3; 384-386
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Temperature Measurements in Non-Equilibrium "Ferroelectric" Plasma
    Autorzy:
    Pawelec, E.
    Simek, M.
    Nassar, H.
    Czernichowski, A.
    Musioł, K.
    Dittrichova, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1945378.pdf
    Data publikacji:
    1996-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    33.10.Jz
    52.70.Kz
    52.25.Kn
    Opis:
    Using spectroscopic measurements vibrational and rotational temperatures were determined in the "ferroelectric" plasma source for different gas mixtures. It was shown that in this time-periodical, atmospheric pressure non-equilibrium discharge, both plasma temperatures differ strongly, and that the vibrational temperature is much higher (≈ 3 kK) than the rotational one (< 1 kK).
    Źródło:
    Acta Physica Polonica A; 1996, 89, 4; 503-507
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Superconductivity and Ferromagnetism in $La_{0.67}Sr_{0.33}MnO_3//YBa_2Cu_3O_7$ Nanosized Heterostructures
    Autorzy:
    Lochmajer, H.
    Matusiak, M.
    Urbanik, G.
    Przyslupski, P.
    Rogacki, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398624.pdf
    Data publikacji:
    2016-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.25.fc
    74.25.fg
    74.78.Fk
    Opis:
    In this work we present recent experimental studies of heterostructures composed of ferromagnetic $La_{0.67}Sr_{0.33}MnO_3$ (LSMO) and superconducting $YBa_2Cu_3O_7$ (YBCO) multilayers grown by dc sputtering method. The transport and magnetic properties of the large set of heterostructures were investigated in a wide temperature range from 2 to 400 K and in fields up to 12.5 T. The resistivity and the upper critical field were measured for samples with the plane active dimensions 1.5× 5 mm². The Nernst effect was studied in the mixed state revealing the characteristic temperature dependence of the Nernst signal which was correlated with variation of the upper critical field. We have observed an influence of the magnetic LSMO layer on the superconducting properties of the adjacent YBCO layer which consists in a substantial reduction of the superconducting critical temperature and a small lowering of the upper critical field.
    Źródło:
    Acta Physica Polonica A; 2016, 130, 2; 588-592
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spectral and Electrical Diagnostics of Gliding Arc
    Autorzy:
    Czernichowski, A.
    Nassar, H.
    Ranaivosoloarimanana, A.
    Fridman, A. A.
    Simek, M.
    Musiol, K.
    Pawelec, E.
    Dittrichova, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1945405.pdf
    Data publikacji:
    1996-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    33.10.Jz
    52.70.Kz
    52.25.Kn
    Opis:
    Using spectroscopic and electric measurements, vibrational and rotational molecular gas temperatures as well as free electron temperature and concentration were determined in different regions of a time-periodical type, atmospheric pressure non-equilibrium low current gliding arc. It was shown that this discharge includes an initial quasi-equilibrium zone, with the quasi-equilibrium temperature of 4 to 6 kK, and the non-equilibrium zone with the electron temperature about 10 kK, the vibrational temperature about 3 kK, rotational and translational temperatures from 1 to 1.5 kK. The transition between two mentioned zones coincides with the phenomenon of the arc "length explosion" already observed in moderate-current gliding arc.
    Źródło:
    Acta Physica Polonica A; 1996, 89, 5-6; 595-603
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Photon Force-Induced Phase Transition Dynamics of Single Hydrogel Nanoparticles in Water
    Autorzy:
    Hosokawa, C.
    Matsumura, Y.
    Yoshikawa, H.
    Iwai, K.
    Masuhara, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1813984.pdf
    Data publikacji:
    2007-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.80.Cc
    33.50.Dq
    61.25.Hq
    87.64.-t
    Opis:
    We investigated laser-induced phase transition dynamics of μm sized single poly(N-isopropylacrylamide) hydrogel particles in water. Single poly(N-isopropylacrylamide) gel particles labeled with a polarity-sensitive fluorescent probe monomer were optically trapped by a focused laser beam and its fluorescence dynamics was analyzed. The fluorescence intensity of trapped single gel particles was increased with the trapping laser power, while the fluorescence peak wavelength was not changed. Temperature-induced changes of fluorescence properties of the single particle were confirmed to be similar to those of the bulk solution. These behaviors are well interpreted by considering that the fluorescence intensity and fluorescence peak reflect local interactions between the fluorescent probe and attaching (bound) water molecules and effective polarity determined by (free) water content in the particle, respectively. A change in the fluorescence peak wavelength after laser trapping was followed and its blue-shift was confirmed to occur within a few hundreds seconds, indicating that a single gel particle gradually attains to a globular state on this timescale, expelling initially free water molecules and then bound ones.
    Źródło:
    Acta Physica Polonica A; 2007, 112, S; S-57-S-70
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparative Study of Influences of Gamma Rays on Calix[4]Arene and 25,27-di(4-Nitrobenzyl)-26,28-Dihydroxycalix[4]Arene: EPR Study
    Autorzy:
    Ceylan, Y.
    Usta, K.
    Ceylan, N.
    Usta, A.
    Koc, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/1031655.pdf
    Data publikacji:
    2017-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    87.66.Uv
    36.20.Kd
    39.30.+w
    33.35.+r
    Opis:
    In the present study, calix[4]arene and its derivate 25,27-di(4-nitrobenzyl)-26,28-dihydroxycalix[4]arene were irradiated for 72 hours by ⁶⁰Co gamma rays at dose rate of 0.720 kGy/h. These irradiated samples were analyzed by EPR method and it was found that one type of radical was produced in calix[4]arene, and two type of radicals were produced in 25,27-di(4-nitrobenzyl)-26,28-dihydroxycalix[4]arene. The measurements were performed in the temperature range of 273-400 K using x-band EPR spectrometer. It was observed that the spectra, obtained from two samples, have very weak temperature dependence. Hyperfine and g parameters were calculated for two samples.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 3; 1211-1213
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wybrane aktualne trendy żywieniowe. Praca przeglądowa
    Selected current nutritional trends. Review work
    Autorzy:
    Gadzała, K.
    Lesiów, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2080619.pdf
    Data publikacji:
    2019
    Wydawca:
    Wydawnictwo Uniwersytetu Ekonomicznego we Wrocławiu
    Tematy:
    zywienie czlowieka
    trendy zywieniowe
    zdrowie czlowieka
    jakosc zycia
    oczekiwania konsumentow
    dietetyka
    wegetarianizm
    dieta eliminacyjna
    zalecenia zywieniowe
    Opis:
    Wiedza o trendach w żywieniu jest aspektem ważnym w kontekście zdrowia oraz jakości życia zarówno dla konsumentów, jak i przedsiębiorstw, ponieważ muszą one odpowiadać na wyzwania konsumentów, wyprzedzać je, by zdobyć nowych klientów, a co za tym idzie – zwiększać zyski. Celem artykułu jest scharakteryzowanie wybranych aktualnych trendów żywieniowych i dietetycznych. Wyróżnia się następujące przesłanki podążania za trendami żywieniowymi: zdrowotne, kulturowe, religijne, etyczne, ekologiczne, psychologiczne, finansowe i związane z globalizacją. Wskazano na istotę, korzyści i ograniczenia stosowania diet wegetariańskiej, wegańskiej i fleksitariańskiej, eliminacyjnej (diet bezglutenowej i bez laktozy), o niskim indeksie glikemicznym, diety w insulinooporności, diety wpływającej na zdrowie psychiczne (żywności komfortowej, oddziałującej pozytywnie na nastrój i emocje i uważne jedzenie), a także diet, które wiążą się z elimanacją marnotrawstwa jedzenia (zero odpadów, mniej odpadów, ekologiczna konsumpcja). Stosowanie każdej z nich i ich odpowiednie zbilansowanie powinno być poparte zaleceniami dietetyka i lekarza.
    Źródło:
    Nauki Inżynierskie i Technologie; 2019, 2(33); 9-25
    2449-9773
    2080-5985
    Pojawia się w:
    Nauki Inżynierskie i Technologie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-14 z 14

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