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    Wyświetlanie 1-11 z 11
    Tytuł:
    A method of the magnetic field formation in cyclotron DC-72
    Autorzy:
    Gulbekian, G.
    Ivanenko, I.
    Filatov, O.
    Franko, J.
    Kukhtin, V.
    Lamzin, E.
    Samsonov, E.
    Semchenkov, A.
    Semchenkova, O.
    Sytchevsky, S. E.
    Dmitrev, S. N.
    Powiązania:
    https://bibliotekanauki.pl/articles/148354.pdf
    Data publikacji:
    2003
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    cyclotron
    magnetic field measurements
    magnetic field simulations
    Opis:
    A method of the magnetic field formation in the cyclotron DC-72 model (scale 1:5) is described. The cyclotron is planned to be built in Slovakia. The stages in the shimming of the cyclotron sectors and an automatic system designed for magnetic measurements are described. The data on the magnetic field measurements in the median plane of the cyclotron are presented. A brief description of a computer simulation model and an algorithm of fitting the required sector profiles is presented, as well as the data on the computer simulation of magnetic field distributions. The data on the magnetic field measurements and those on the computer simulations are compared and analyzed. Possible reasons of differences between the measured and simulated data are discussed. The results of the above mentioned computer simulations will be used for building a large facility - the cyclotron DC-72.
    Źródło:
    Nukleonika; 2003, 48, 4; 207-210
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of magnetic field on the corrosion of iron as studied by positron annihilation
    Autorzy:
    Pietrzak, R.
    Szatanik, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/146285.pdf
    Data publikacji:
    2010
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    corrosion
    magnetic field
    positron annihilation
    Opis:
    Lifetime spectra of positron annihilation in iron corroded in a water solution of HCl and in vapour above its surface have been investigated with emphasis on the effect of corrosion time and environment (solution or vapour) as well as of the presence and orientation of the magnetic field on the measured positron annihilation parameters. All the registered positron lifetime spectra consist of two components. For corroded samples, the intensities of the two components as well as the corresponding values of the mean positron lifetime, differ from those for uncorroded material. The corrosion-induced changes in the positron annihilation parameters depend on the corrosion environment (solution or vapour) and on the presence and direction of external magnetic field.
    Źródło:
    Nukleonika; 2010, 55, 1; 31-34
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Development of a magnetic field monitoring system for the JAERI AVF cyclotron
    Autorzy:
    Okumura, S.
    Arakawa, K.
    Fukuda, M.
    Nakamura, Y.
    Yokota, W.
    Ishimoto, T.
    Kurashima, S.
    Ishibori, I.
    Nara, T.
    Agematsu, T.
    Nakajima, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/148733.pdf
    Data publikacji:
    2003
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    compensation coil
    cyclotron
    magnetic field
    Opis:
    We have developed a probe of a nuclear magnetic resonance (NMR) magnetometer for measurement of a fluctuation of an AVF cyclotron field. The stability of the magnetic field of the JAERI AVF cyclotron, measured with the NMR probe, was within 1 × 10-5. A field-measurement accuracy of the order of 1 × 10-6 was achieved using a set of field-compensation coils and optimizing the probe position to obtain enough homogeneity of the magnetic field around the probe for measuring the cyclotron field with a high gradient. To eliminate a major bottleneck in the field measurement inside the cyclotron, the probe was specially produced with the cable shielding against RF noises and proper materials applied.
    Źródło:
    Nukleonika; 2003, 48,suppl.2; 35-37
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic field simulation in the central region of the VINCY Cyclotron
    Autorzy:
    Vorojtsov, S.
    Vorozhtsov, A.
    Nešković, N.
    Ristić -Durović, J.
    Ćirković, S.
    Vujović, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/148735.pdf
    Data publikacji:
    2003
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    cyclotron
    central region
    magnetic field
    plug
    beam dynamics
    Opis:
    The VINCY Cyclotron is under construction at the Vinca Institute of Nuclear Sciences, Laboratory of Physics, Belgrade, Serbia and Montenegro. One of the most difficult problems to solve is the magnetic field shaping in the central region of the machine in a wide range of field levels. The latest measurements showed a very large magnetic field depression in the central region. The following shimming elements are used for the field shaping in the central region: a central plug and a spacer ring between the sectors and the median pole plate. These elements should both release enough vertical space for the inflector and the RF electrodes and produce a field bump in the very center of the machine. Concerning this region, one has to mention the following facts: sectors are absent or very reduced, and the small gap between the sectors restricts remarkably the possibilities of producing a field bump. Therefore, the design of these elements is the most critical one. Optimization of the central plug gap affects both the vertical sparking probability and the beam dynamics at higher harmonic modes. The redesign of the magnetic structure of the central region relied solely on the detailed 3-dimensional calculations to speed up the experimental shimming procedure. The desired calculated magnetic field shapes, which include the influence of the plug, have been produced and confirmed
    Źródło:
    Nukleonika; 2003, 48,suppl.2; 39-44
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of frequent magnetic field on chlorophyll content in leaves of sugar beet plants
    Autorzy:
    Rochalska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/147808.pdf
    Data publikacji:
    2005
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    magnetic field
    chlorophyll
    nitrogen
    seed quality improvement
    sugar beet
    Opis:
    Chlorophyll content in plant leaves is correlated with the yield and nitrogen content in plants. Non-destructive investigations of chlorophyll content in leaves of 3 varieties of sugar beet grown from seeds revealed that a low frequent magnetic field, acting independently or in combination with other methods of seed improvement, increased chlorophyll content in leaves of the investigated plants. The treatment with the magnetic field increased nitrogen content in the examined plants. The effect was not connected with environmental conditions during vegetation seasons.
    Źródło:
    Nukleonika; 2005, 50,suppl.2; 25-28
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ab initio study of the effect of pressure on the hyperfine parameters of 57Fe in bcc phase
    Autorzy:
    Michalecki, T.
    Deniszczyk, J.
    Frąckowiak, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/148860.pdf
    Data publikacji:
    2003
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    TB-LMTO
    FP-LAPW
    Fe-bcc
    hyperfine magnetic field
    isomer shift
    Opis:
    In this paper the results of studies on the effect of pressure on hyperfine magnetic field (Bf) and isomer shift (IS) for Fe-bcc are presented. Two calculation methods were used: TB-LMTO (Tight Binding Linear Muffin-Tin) and FP-LAPW (Full Potential Linearized Augmented Plane Wave) and the obtained results have been compared. Both methods lead to comparable results. In the study a particular emphasis has been laid on investigations of the atomic core electrons (1s, 2s, 3s) and of the conduction electrons 4s on the Bf and IS values. The calculated values of the dIS/dlnV and dlnB /dlnV parameters give evidence of good conformity with those derived from experimental data.
    Źródło:
    Nukleonika; 2003, 48,suppl.1; 45-48
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of low frequency magnetic field upon cultivable plant physiology
    Autorzy:
    Rochalska, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/147684.pdf
    Data publikacji:
    2008
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    alternating magnetic field
    yield-forming features
    photosynthetic active radiation (PAR)
    leaf area index (LAI)
    yielding
    sugar beet
    Opis:
    The 16 Hz frequency and 5 mT magnetic flux density as well as alternating magnetic field influence the field germination physiological yield-forming features and the yield of sugar have been investigated. The profitable influence of the investigated factor at physiological yield-forming features, causing an increase in sugar beet root and leaf yield, was shown. The beneficial influence on the yield is especially clear in unfavourable weather conditions.
    Źródło:
    Nukleonika; 2008, 53, suppl. 1; 17-20
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Higher - order field - dependent terms in spin Hamiltonians for transition ions : implications for high - magnetic field and high - frequency EMR measurements
    Autorzy:
    Rudowicz, Cz.
    Powiązania:
    https://bibliotekanauki.pl/articles/148384.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    electron magnetic resonance (EMR)
    high-magnetic field and high-frequency EMR (HMF-EMR)
    generalized spin Hamiltonians (GSH)
    higher-order field-dependent (HOFD) terms
    zero-field splitting (ZFS) terms
    transition ions in crystals
    Opis:
    An overview of theoretical background of the higher-order field-dependent (HOFD) terms in the generalized spin Hamiltonians for transition ions and current status of experimental studies of the HOFD terms is provided in the nutshell. The terms nonlinear in the magnetic field (B) of the type: B2S2, B3S, B5S or B2I2, B3I, B5I, where S and I is the electronic and nuclear spin, respectively, are of particular importance as compared with the usual linear Zeeman term B.g.S. This is due to the high B values, up to 100 T (pulsed fields), achievable at present in the high-magnetic field and/ or high-frequency electron magnetic resonance (HMF-EMR) measurements of magnetic and spectroscopic properties. A blueprint for future theoretical and experimental studies of the HOFD terms is proposed taking into account their implications for HMF-EMR measurements
    Źródło:
    Nukleonika; 2013, 58, 3; 341-345
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reconstruction of the 3-dimensional magnetic fields of the strong focusing separator
    Autorzy:
    Artukh, A.
    Budzanowski, A.
    Koscielniak, F.
    Kozik, E.
    Kukhtin, V.
    Semchenkov, A.
    Semchenkova, O.
    Sereda, Y.
    Shchepunov, V.
    Sytchevsky, S. E.
    Szmider, J.
    Teterev, Y. G.
    Powiązania:
    https://bibliotekanauki.pl/articles/148741.pdf
    Data publikacji:
    2003
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    magnetic separator
    field reconstruction
    KOMPOT code
    Opis:
    For unambiguous identification of products of nuclear reactions by the (TOF-?E) method, it is necessary to know exactly the magnetic field distributions, the 3D field map for the entire working area of separator. The possibility of the field reconstruction inside the total volume surrounded by the closed surface, on which the magnetic measurements are performed, is demonstrated in this paper. Distributions of the measured magnetic field components of the magnets, forming the magnetic structure of the separator, as well as the respective reconstructed fields together with the estimated reconstruction errors, are presented. Precise simulation of particle trajectories inside the separator becomes possible as a result of this work
    Źródło:
    Nukleonika; 2003, 48,suppl.2; 49-53
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    EMR-related problems at the interface between the crystal field Hamiltonians and the zero-field splitting Hamiltonians
    Autorzy:
    Rudowicz, Cz.
    Karbowiak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/971531.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    crystal/ligand field (CF/LF) Hamiltonian electron magnetic resonance (EMR)
    magnetism
    optical spectroscopy
    transition (3dN and 4fN) ions
    zero-field splitting (ZFS)
    Opis:
    The interface between optical spectroscopy, electron magnetic resonance (EMR), and magnetism of transition ions forms the intricate web of interrelated notions. Major notions are the physical Hamiltonians, which include the crystal field (CF) (or equivalently ligand field (LF)) Hamiltonians, and the effective spin Hamiltonians (SH), which include the zero-fi eld splitting (ZFS) Hamiltonians as well as to a certain extent also the notion of magnetic anisotropy (MA). Survey of recent literature has revealed that this interface, denoted CF (LF) ↔ SH (ZFS), has become dangerously entangled over the years. The same notion is referred to by three names that are not synonymous: CF (LF), SH (ZFS), and MA. In view of the strong need for systematization of nomenclature aimed at bringing order to the multitude of different Hamiltonians and the associated quantities, we have embarked on this systematization. In this article, we do an overview of our efforts aimed at providing a deeper understanding of the major intricacies occurring at the CF (LF) ↔ SH (ZFS) interface with the focus on the EMR-related problems for transition ions.
    Źródło:
    Nukleonika; 2015, 60, No. 3, part 1; 377-383
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling of EMR data for Fe2+(S=2) ions in a [2Fe-2S] cluster in the reduced ferredoxin
    Autorzy:
    Rudowicz, Cz.
    Piwowarska, D.
    Gnutek, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/146266.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    [2Fe-2S] cluster
    electron magnetic resonance (EMR)
    Fe2+ ions
    microscopic spin Hamiltonian (MSH)
    zero field splitting (ZFS) parameters
    Opis:
    The modelling techniques employed in this study utilize structural data to enable correlation of EMR data – described by the spin Hamiltonian (SH) and optical spectroscopy data – described by the crystal field (CF) Hamiltonian. These techniques enable also to predict magnetic and spectroscopic properties of 3dN ions, especially 3d4 and 3d6 ions, in various systems. Specific applications are considered for [Fe2+ and Fe3+] binuclear centres in [2Fe-2S] cluster in the reduced ferredoxin and related biological molecules. The background for model calculations of the zero-field splitting (ZFS) parameters and/or crystal field parameters and the capabilities of the two major techniques used will be presented in the full paper. Here, we present preliminary results of the microscopic spin Hamiltonian (MSH) modelling for Fe2+ (3d6) ions in the reduced ferredoxin.
    Źródło:
    Nukleonika; 2013, 58, 3; 347-350
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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