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  • 1
    Electronic Resource
    Electronic Resource
    Magnetic, Mössbauer, and neutron diffraction investigations of W-type hexaferrite BaZn2−xCoxFe16O27 single crystals (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 5074-5080 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Macroscopic magnetic measurements, Mössbauer, and neutron diffraction studies have been carried out on BaCoxZn2−xFe16O27 [(Zn−Co)2-W] single-crystal hexaferrites. The extrapolated saturation magnetization values σs(0) are slightly lower than those found in the literature. Such differences have been justified as due to the different Co and Zn distributions among the tetrahedral sites.The Co ions induce a strong planar contribution to the magnetic anisotropy. At low temperature, the spin order, found from the macroscopic magnetic measurements and preliminary neutron diffraction studies, is planar, while the Mössbauer data indicate a conical order with an angle of 70° with respect to the c axis. By increasing the temperature, the cobalt anisotropy decreases and a spin reorientation to easy axis is observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340405
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  • 2
    Electronic Resource
    Electronic Resource
    Trace Elements and Public Health (1985)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Public Health 6 (1985), S. 131-146 
    Details
    ISSN: 0163-7525
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.pu.06.050185.001023
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  • 3
    Electronic Resource
    Electronic Resource
    Prevention of postsurgical relapse and recurrence in Crohn's disease (2003)
    Oxford, UK : Blackwell Publishing Ltd
    Alimentary pharmacology & therapeutics 17 (2003), S. 0 
    Details
    ISSN: 1365-2036
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: After first resection in Crohn's disease at 1 year 60–80% of patients have endoscopic recurrence, 10–20% have clinical relapse, and 5% have surgical recurrence.1, 2 This review focuses on the actual evidence on the prevention of recurrence and relapse dealing with risk factors and with drugs. Smoking is the only risk factor for Crohn's disease, that has been shown to be related to both endoscopic and surgical recurrence and relapse. Among the different drugs evaluated, some (Mesalamine and Metronidazole) have been shown to be effective, whereas others (immunosuppressive) need to be evaluated in further, new trials.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2036.17.s2.12.x
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  • 4
    Electronic Resource
    Electronic Resource
    Effect of the exchange potential and of the cut-off radii on the energy bands of α-quartz (1984)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 3 (1984), S. 361-378 
    Details
    ISSN: 0392-6737
    Keywords: Nonlocalized single-particle electronic states
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Si presenta un’analisi dell’effetto che diverse forme del potenziale di scambio e diversi valori dei raggi di cut-off hanno sulla struttura a bande del quarzo-α, calcolata col metodo della base mista. Si fa una scelta ottimale e le corrispondenti bande sono calcolate e discusse.
    Abstract: Резюме Проводится анализ влияния различных форм обменного потенциала и величин радиуса обрезания на зонную структуру α-кварца. Предлагается оптимальный выбор и вычисляются соответсвующие зоны. Проводится обсуждение полученных результатов.
    Notes: Summary An analysis of the effect of different forms of the exchange potential and values of the cut-off radii in the mixed-basis calculation of the band structure of α-quartz is presented. An optimal choice is made and the corresponding bands are computed and discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02457465
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  • 5
    Electronic Resource
    Electronic Resource
    Susceptibility of mink to methemoglobin formation (1995)
    Springer
    Bulletin of environmental contamination and toxicology 55 (1995), S. 439-445 
    Details
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00206684
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  • 6
    Electronic Resource
    Electronic Resource
    Effect of the Zn2+ distribution on the magnetic properties of Ba2Zn2Fe12O22(Zn2-Y) hexaferrite investigated by thermal-scan Mössbauer spectroscopy (1984)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 4 (1984), S. 255-262 
    Details
    ISSN: 0392-6737
    Keywords: Mössbauer effect ; other γ-ray spectroscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Utilizzando tecniche Mössbauer si è analizzato il ruolo della distribuzione cationica sulle proprietà magnetiche dell’esaferrito Ba2Zn2Fe12O22 (Zn2-Y). A questo scopo è stato messo a punto un apparato a basso costo controllato da microcomputer per analisi termiche che utilizza l’effetto Mössbauer. L’apparecchiatura consente misure di temperatura di Curie con tempi di misura inferiori a quelli di apparecchiature simili descritte in precedenza. La variazione della temperatura di Curie al variare della temperatura di sinterizzazione osservata nell’esaferrito Zn2-Y è stata correlata con la distribuzione del catione Zn2+ tra i due siti tetraedrici presenti nella struttura Y.
    Abstract: Резюме Используя технику эффекта Мессбауэра, анализируется роль распределения катионов на магнитные свойства гексаферрита Ba2Zn2Fe2O22(Zn2-Y). Для этой цели предлагается недорогостоящая установка, контролируемая компьютером для тырмического анализа, которая исрользует зффект Мессбауэра. Предложенная установка позволяет точно измерять температуру Кюри, причем времена измерений оказываются существенно меныше, чем у родобных установок, орисанных в литературе. Изменение температуры Кюри в завицимости от температурм спекания Zn2-Y коррелирует с различными распределениями катионов Zn2+ между двумя тетраздрическими подрешетками, присутстствующими в Y-структуре.
    Notes: Summary The role of the cation distribution on the magnetic characteristics of Ba2Zn2Fe12O22(Zn2-Y) hexaferrite has been analysed by using Mössbauer techniques. For this purpose we developed a low-cost microcomputer-controlled thermal-scan Mössbauer apparatus that allows accurate measurements of the Curie temperature. The measuring times are much shorter than those attained with previously described similar apparata. The variation of the Curie temperature with the sintering temperature of Zn2-Y has been correlated with different cation distributions of Zn2+ among the two tetrahedral sublattices present in the Y-structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02453344
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  • 7
    Electronic Resource
    Electronic Resource
    Superparamagnetic effects and cation distribution in industrially produced hexaferrite fine powders (1989)
    Springer
    Hyperfine interactions 45 (1989), S. 271-276 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Fine powder samples of substituted Barium M-type haxaferrites with composition BaFe12−2xCoxTixO19 (0.72〈x〈0.84) have been studied by macroscopic magnetic measurements (Curie temperature, magnetization, anisotropy field, coercive field) and Mössbauer spectroscopy. The analysis of the magnetization data and of the distribution of Co−Ti among the iron sublattices suggest that the Gorter spin arrangement is no longer valid. The Mössbauer data allow to rule out the possible presence of superparamagnetic fine particles as the origin of the observed scattering in the magnetization values.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02405888
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  • 8
    Electronic Resource
    Electronic Resource
    Mössbauer investigation of W-type hexaferrite of composition BaZn2−xCoxFe16O27 (1986)
    Springer
    Hyperfine interactions 28 (1986), S. 487-489 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Abstract Polycrystauine samples of composition BaZn2−xCox 16O27 (O〈x〈2) have been examined by thermomagnetic analysis and Mössbauer spectroscopy. Cobalt ions enter preferentially the octahedral sites of the spinel block and give rise to strong perturbations of the magnetic order. The 12k sublattice splits into two magnetically inequivalent sublattices. A spin reorientation transition is observed at a temperature that increases with increasing cobalt content. Co2-W undergoes a transition from planar to conical order at 515±5 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02061493
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  • 9
    Electronic Resource
    Electronic Resource
    Mössbauer investigation on archaic trade amphoras of Phoenician and Etruscan origin (1986)
    Springer
    Hyperfine interactions 29 (1986), S. 1109-1112 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Etruscan trade amphoras are a kind of pottery widely diffused in the archaic period (VII–VI century B.C.) in many archaeological sites of the Mediterranean area. It is only recently that the problem of their origin with regard to their similarity with Phoenician amphoras has been taken into consideration. Indeed, from the morphologic point of view, the earlier Etruscan and Phoenician trade amphoras are rather similar in shape. It is therefore difficult to distinguish, on archaeological grounds alone, the different production centers. We have therefore performed a detailed Mössbauer investigation on amphoras found in different sites of Central Italy and Sicily. The obtained data allowed us to assess with certainty the Etruscan origin of a peculiar type of amphoras for which a Phoenician origin had previously been proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02399428
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