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  • 1985-1989  (3)
  • 1980-1984  (4)
  • 1985  (3)
  • 1981  (4)
Datenquelle
Materialart
Erscheinungszeitraum
  • 1985-1989  (3)
  • 1980-1984  (4)
Jahr
Schlagwörter
  • 1
    Digitale Medien
    Digitale Medien
    Analytical possibilities for determining the demand for the optimal quantity of deoxidants influencing favourably the morphology of nonmetallic inclusions in steels (1985)
    Springer
    Microchimica acta 86 (1985), S. 51-58 
    Details
    ISSN: 1436-5073
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary The analytical methods, which give information directly or at least at a speed corresponding to the technology about the momentary composition of the steel bath, are indispensable for the optimization of the metallurgical processes. Especially the determination of oxygen concentration plays a very important role among the socalled quick analytical methods. The sources of reoxidation have the most serious pernicious effect, because the oxygen level of steel increases again for the effect of reoxidation after the deoxidation. The determination of oxygen content of the samples taken from the steel bath by means of classical method is not suitable for controlling the metallurgical processes, because the time necessary for the traditional analytical methods is unfavourably long and they measure the total oxygen content of the steel bath. It is, however, more important to know the so-called disposable oxygen concentration, for controlling the metallurgical reactions. The principle of determining the active oxygen content is the measurement of the electromotive force of the solid ZrO2 electrolyte cell. The possibility of the direct measurement of active oxygen content seems to be a “milestone” in adjusting the oxygen level of the metallurgical processes, and by this influencing favourable the morphology of the nonmetallic inclusions of steel to improve the quality of steel. The quantity of Al necessary theoretically for the final deoxidation, if the oxygen level is known, is not enough, but it is important to know the quantity of the dissolved Al, too. Therefore, it became necessary to work out such methods which determine the Al content after a very quick dissolution by means of atomic absorption spectrometry, or photometry and the period of determination is some minutes only. The development of the inclusion–separation methods is considered also very important, because it completes the analytical examinations controlling and following the steelmaking technology with valuable data.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01203006
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  • 2
    Digitale Medien
    Digitale Medien
    Familial leukemia: Ph1 positive acute lymphoid leukemia of a mother and her infant (1981)
    Springer
    Annals of hematology 43 (1981), S. 265-272 
    Details
    ISSN: 1432-0584
    Schlagwort(e): Acute lymphoid leukemia ; Ph1 positivity
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary The authors report the case of a mother and her infant who both suffered from acute lymphoid leukemia (ALL). Both leukemic processes proved to be Ph1 positive and of “0” cell character. In addition to the clinical and hematological findings the results of HLA antigen determination and cytogenetic studies are presented.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00320456
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  • 3
    Digitale Medien
    Digitale Medien
    Determination of elemental constituents in high voltage insulator borosilicate glasses under proton bombardment (1985)
    Springer
    Journal of radioanalytical and nuclear chemistry 92 (1985), S. 391-398 
    Details
    ISSN: 1588-2780
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Energietechnik
    Notizen: Abstract It is demonstrated that combined PIXE and PIGE measurements are suitable for the accurate determination of the elemental concentration of glass samples. Borosilicate glasses used as high voltage insulators in Van de Graaff accelerators and tested for the relevant physical properties have been analyzed. A correlation between concentrations and physical properties has been found, supporting the additivity rule.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02219769
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  • 4
    Digitale Medien
    Digitale Medien
    Measurements of relative thick target yields for PIGE analysis on light elements in the proton energy interval 2.4–4.2 MeV (1985)
    Springer
    Journal of radioanalytical and nuclear chemistry 89 (1985), S. 123-141 
    Details
    ISSN: 1588-2780
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Energietechnik
    Notizen: Abstract In order to extend the energy range of the systematic investigation on relative thick target yields performed by ANTTILA et al2 for 1≤Ep≤2.4 MeV bombarding energies, gamma spectra and yield data are presented for elements Z=3–9, 11–17, 19–21 in the energy range 2.4≤Ep≤4.2 MeV and the results are discussed from the point of view of PIGE analysis.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02070210
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  • 5
    Digitale Medien
    Digitale Medien
    Location of nodulation and nitrogen fixation genes on a high molecular weight plasmid of R. meliloti (1981)
    Springer
    Molecular genetics and genomics 184 (1981), S. 318-325 
    Details
    ISSN: 1617-4623
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary R. meliloti strain 41 (Rm41) was shown to harbour two indigenous plasmids with molecular weights of 140 Mdal (pRmc41a) and more than 300 Mdal (pRme41b), respectively. Using a heat-treatment procedure, derivatives of Rm41 defective in nodulation (Nod-) or nitrogen fixation (Fix-) have been readily obtained. In some Nod- mutants the deletion of a segment of plasmid pRme41b was found. Based on the demonstrated homology between the nitrogen fixation (nif) genes of Klebsiella pneumoniae and of R. meliloti the Rhizobium nif region has been cloned into the cosmid vector pHC79, then recloned into pBR322 and the restriction map of the nif region has been determined. 32P-labelled nick-translated probe prepared from the cloned nif DNA fragment hybridized to pRme41b of Rm41 but for most Nod- mutants this hybridization was not detected. Hybridization of a cosmid containing Rm41 DNA to total DNA digests from the wild-type bacterium and from a series of Nod- mutants revealed that at least a 24 kb DNA fragment including the nif structural genes was missing from most of the Nod- mutants. These results, together with the genetic analyses of these symbiotic mutations suggest that some nod and fix genes are located on pRme41b.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00272925
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  • 6
    Digitale Medien
    Digitale Medien
    Foreign body induced chronic abscess imitating cancer of the bladder wall (1981)
    Springer
    International urology and nephrology 13 (1981), S. 65-68 
    Details
    ISSN: 1573-2584
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract A case of foreign body induced bladder wall abscess erroneously diagnosed as cancer and identified only after surgical removal of the bladder is described. Replacement of the bladder was done by ileo-cystoplasty.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02082073
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  • 7
    Digitale Medien
    Digitale Medien
    Oxydative Deammonisierung von NH4-Zeolithen (1981)
    Springer
    Journal of thermal analysis and calorimetry 20 (1981), S. 351-359 
    Details
    ISSN: 1572-8943
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: Résumé On a effectué une étude thermogravimétrique comparée de la désammoniation de NH4-mordénite, NH4-chabazite et NH4-stilbite, dans des atmosphères oxydantes et inertes. Les résultats permettent de supposer qu'en atmosphère d'oxygène il se produit une oxydation intracristalline des cations du réseau d'ammonium thermiquement excités. Cette réaction s'effectue à des températures bien plus faibles que dans une atmosphère inerte et, par conséquent, conduit à une séparation bien plus distincte du processus de déshydroxylation et de désammoniation. En raison des conditions hydrothermiques qui résultent de la formation d'eau pendant la désammoniation, certains changements de structure de la forme hydrogénée de la chabazite et de la stilbite ont lieu et sont révélés par les changements du comportement de déshydroxylation.
    Kurzfassung: Zusammenfassung Es wurde eine vergleichende thermogravimetrische Untersuchung der Deammonisierung von NH4-Mordenit, NH4-Chabasit und NH4-Stilbit ausgeführt. Aus dem Verlauf der TG-Kurven kann geschlossen werden, da\ in O2-AtmosphÄre eine intrakristalline Oxydation thermisch angeregter Ammonium-Gitterkationen erfolgt. Diese Reaktion verlÄuft bei wesentlich niedrigeren Temperaturen als die thermische Deammonisierung in inerter AtmosphÄre und führt damit zu einer besseren Trennung von Deammonisierung und Dehydroxylierung. Unter den durch die Bildung von Wasser wÄhrend der oxydativen Deammonisierung gegebenen hydrothermalen Bedingungen gehen — im Falle von Chabasit und Stilbit — gewisse strukturelle VerÄnderungen der H-Form vor sich, die sich in einem unterschiedlichen Dehydroxylierungsverhalten zu erkennen geben.
    Notizen: Abstract A comparative thermogravimetric study of the deammoniation of NH4-mordenite, NH4-chabazite, and NH4-stilbite in oxidizing and inert atmosphere has been carried out. The results suggest that in oxygen atmosphere an intracrystalline oxidation of thermally-excited ammonium lattice cations occurs. This reaction proceeds at much lower temperatures than the thermal deammoniation in an inert atmosphere and consequently results in a much better separation of the dehydroxylation process from the deammoniation. Because of the hydrothermal conditions resulting from the formation of water during the oxidizing deammoniation, certain structural changes of the hydrogen form of chabazite and stilbite occur as revealed by changes of the dehydroxylation behaviour.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01912884
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