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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of organic chemistry 28 (1963), S. 509-511 
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 5187-5189 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Small-angle neutron scattering experiments on nanostructured Fe reveal spatial magnetic correlations across the interfaces which depend strongly on grain size, with a minimum at around 35 nm. This grain size is comparable with Lcrit=πδ, with δ the bulk domain-wall width. We present an extended random-anisotropy model to explain the magnetic properties in the low grain size regime and explain the crossover of the magnetic properties for grain sizes comparable with Lcrit. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 1573-1579 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The results of a study on the crystallization of amorphous Cu47Ti34Zr11Ni8 with the use of differential scanning calorimetry, transmission electron microscopy (TEM), x-ray diffraction, field ion microscopy, atom probe tomography (APT), and small-angle neutron scattering (SANS) are presented. These experimental techniques were used to characterize as-prepared samples and specimens heat treated at different temperatures around the glass transition temperature. APT and SANS show that the alloy decomposes into copper-enriched and titanium-enriched regions prior to nucleation and growth of a crystalline phase. TEM shows that the primary nucleating phase has a face centered cubic structure. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Microchimica acta 41 (1953), S. 79-88 
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary A new method of developing paper chromatograms of organic acids is given. It is generally applicable. The acids are made visible as pure white flecks on a brown background. The identification limit for citric acid is 1.2μg, for phosphoric acid 0.5μg. Quantitative determinations are possible through comparison of the size of the fleck with a test straight line constructed for the particular acid and solvent; the accuracy is ± 10%. A quantitative determination with a mean error of ± 5% can be made by preparing a dilution series of the solution being studied, valuating, and comparing with the test straight line. The three component system-acetic ester, glacial acetic acid, water-was studied with respect to its suitability as a solvent mixture for the paper chromatography of organic acids. In the ratio 3∶1∶1 it is suitable for separating the acids occurring in plants.
    Abstract: Résumé On donne une nouvelle méthode utilisable, en général, pour révéler les chromatogrammes sur papier, d'acides organiques, dans laquelle ceux-ci sont rendus visibles à l'état de tache blanche sur fond brun. La limite de dilution pour l'acide citrique est voisine de 1,2μg et celle de l'acide phosphorique de 0,5μg. La comparaison de la dimension des taches avec une droite d'étalonnage pour l'acide correspondant et le dissolvant utilisé permet une évaluation quantitative avec une erreur moyenne de ± 10%. Par préparation d'une série de dilutions de la solution étudiée, estimation et comparaison à la droite d'étalonnage, un dosage peut s'effectuer avec une erreur moyenne de ± 5%. Le système triple ester acétique-acide acétique-eau a été étudié du point de vue de sa convenance comme mélange dissolvant pour la chromatographie d'acides organiques sur papier. Il convient pour la séparation des acides existant dans les végétaux si on le prend dans le rapport 3∶1∶1.
    Notes: Zusammenfassung Es wird eine neue, allgemein anwendbare Entwicklungsmethode für Papierchromatogramme organischer Säuren angegeben, bei der die Säuren als reinweiße Flecke auf braunem Grund sichtbar gemacht werden. Die Erfassungsgrenze für Citronensäure liegt bei 1,2μg, für Phosphorsäure bei 0,5μg. Vergleich der Fleckengröße mit einer für die betreffende Säure und das verwendete Lösungsmittel aufzunehmenden Testgeraden erlaubt eine quantitative Bestimmung mit einem mittleren Fehler von ± 10%. Durch Herstellen einer Verdünnungsreihe der zu untersuchenden Lösung, Auswerten und Vergleich mit der Testgeraden läßt sich eine quantitative Bestimmung mit einem mittleren Fehler von ± 5% durchführen. Das Dreistoffsystem Essigester-Eisessig-Wasser wird auf seine Eignung als Lösungsmittelgemisch für die Papierchromatographie organischer Säuren untersucht. Es eignet sich im Verhältnis 3∶1∶1 zur Trennung der in Pflanzen vorkommenden Säuren.
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Microchimica acta 46 (1958), S. 587-592 
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Microchimica acta 42 (1954), S. 226-230 
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary A method, designated as “inverse retention” is described. With it one may determine quantitatively organic acids, whose lead salts are insoluble in a water-acetone mixture, in amounts of 10 to 150 μg, even though the solutions contain as little as 0.03% of the individual acids. Depending on the nature of the acids, the mean error lies between 6 and 12% in test determinations on acid mixtures and also in the analysis of crude plant extracts.
    Abstract: Résumé On décrit une méthode désignée comme « rétention inverse », avec les acides organiques dont les sels de plomb sont insolubles dans un mélange eau-acétone et qui peut être utilisée pour doser quantitativement sur des quantités de 10 à 150 μg les solutions qui contiennent encore environ 0,03% d'acides individuels. L'erreur moyenne d'un dosage isolé se tient suivant la nature de l'acide entre 6 et 12%, en opérant soit sur des mélanges d'acides témoins, soit sur des extraits de plantes bruts.
    Notes: Zusammenfassung Es wird eine als „inverse Retention“ bezeichnete Methode angegeben, mit der organische Säuren, deren Bleisalze in einem Aceton-Wasser-Gemisch unlöslich sind, noch in Lösungen, die zirka 0,03% der einzelnen Säuren enthalten, in Mengen von 10 bis 150 μg quantitativ bestimmt werden können. Der mittlere Fehler der Einzelbestimmung liegt — bei Testbestimmungen an Säuregemischen wie auch bei der Analyse von rohen Pflanzenextrakten — je nach Art der Säure zwischen 6 und 12%.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 191 (1930), S. 1-35 
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1. In dem bearbeiteten Teil des ternären Systems Na2O-Si02-ZrO2 werden ganz oder teilweise neu beschrieben die Verbindungen: Als primare Ausscheidung kommt außerdem noch das Zirkonoxyd und das Zirkonsiliket vor, die nicht naher uniersucht wurden.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 63 (1930), S. 1446-1455 
    ISSN: 0365-9631
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 10
    Publication Date: 2020-02-12
    Description: Monoclinic 4C pyrrhotite (Fe7S8) is ferrimagnetic due to an ordered defect structure with alternating vacancy and vacancy-free sublattices. Its low-temperature magnetic transition near 35 K is characterized by the distinct increase in coercivity and remanent magnetization. The increase of these parameters has been attributed to changes in the domain wall structure. We present static and dynamic magnetization data of a powder sample to study the domain-wall dynamics across the low-temperature transition. The amplitude-dependent ac susceptibility and the ferromagnetic resonance spectroscopy indicate that the hardening of the domain-wall pinning at the transition occurs simultaneously with the decrease in initial saturation remanent magnetization. These two effects are explained by the enhanced inhomogeneity of the bulk material caused by the persistency of the ordered vacancies and by newly formed defects due to localized distortion of Fe(II) sites in the vacancy-free sublattice. The generated localized defects are the link between the domain wall dynamics and the low-temperature transition in 4C pyrrhotite.
    Keywords: 550 - Earth sciences
    Type: info:eu-repo/semantics/article
    Format: application/pdf
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