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  • Springer  (40)
  • American Institute of Physics (AIP)  (4)
  • International Union of Crystallography (IUCr)  (3)
  • Blackwell Publishing Ltd  (1)
  • 1990-1994  (19)
  • 1985-1989  (29)
  • 11
    Electronic Resource
    Electronic Resource
    Synthese und Reaktionen von 2-Arylhydrazono-2-cyan-N,N-dialkyl-acetamidinen (1991)
    Springer
    Monatshefte für Chemie 122 (1991), S. 195-207 
    Details
    ISSN: 1434-4475
    Keywords: 5-Dialkylamino-2-aryl-1,2,3-triazoles ; 4-Amino-2,6-dioxo-tetrahydropyrid-3-yl-pyridiniumchloride ; 2-Arylhydrazono-2-cyan-N-chloracetylacetamide ; Arylhydrazono-2-cyan-N,N-dialkylacetamidines ; Arylhydrazonomalononitriles ; 4-Imino-5-arylazo-6-dialkylamino-1,4-dihydropyrimidines ; 13C-NMR
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The title compounds3 were synthesized by reaction of arlyhydrazono-malononitriles1 with secondary amines and used for subsequent cyclization reactions. Thus,3 undergoes cyclooxidation by treatment with CuSO4/pyridine to form the 5-dialkylamino-2-aryl-1,2,3-triazolo-4-carbonitriles4. From4 a and hydrazine hydrate/DMF the 4-(1,3,4-triazolyl-5)-1,2,3-triazole5 c is obtainable. The chloroacetylation of3 is accompanied by hydrolysis of the amino group to yield the arylhydrazono-N-chloracetyl cyanoacetamides6. The quaternisation of6 with pyridins is followed by the Thorpe cyclization to form the 4-amino-5-arylazo-6-hydroxy-3-pyridinio-pyrid-2-on-chlorides8, useful as cationic dyes. The reaction of3 with trichloroacetonitriles yields the 5-arylazo-4-imino-2-trichlormethyl-1,4-dihydropyrimidines10 a–c which can be converted into the 5-arylazo-2-hydrazino-pyrimidine derivatives10 d–f. From10 d the 6-phenylazo-triazolo[4,3-a]pyrimidine derivative11 is obtainable. From3 and phenylisothiocyanate the 5-arylazo-4-imino-1,4-dihydropyrimidin-2-thiones12 arise. The structures were investigated by13C-NMR-spectroscopy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00809365
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  • 12
    Electronic Resource
    Electronic Resource
    Amorphous hydrogenated silicon studied by positron lifetime spectroscopy (1986)
    Springer
    Applied physics 40 (1986), S. 145-149 
    Details
    ISSN: 1432-0630
    Keywords: 71.60 ; 72.80 ; 78.70 Bj
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Hydrogenated amorphous silicon (a-Si:H) prepared by dc glow discharge in silane was investigated by positron lifetime measurements at room temperature. The lifetime spectrum shows considerably longer lifetimes than in simultaneously measured Si single crystals. The dominant component with the time constantτ 2=402 ps is discussed thoroughly in conjunction with positron trapping at microvoids containing more than 10 to 15 vacancies. Positron trapping at H-saturated dangling bonds cannot be ruled out. The long-lived component withτ 3=1800 ps (I 3=0.06) indicates positronium formation at larger voids.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00617395
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  • 13
    Electronic Resource
    Electronic Resource
    Reply to the comment by S. Dannefaer et al. on the paper of H. E. Schaefer et al. on “amorphous hydrogenated silicon studied by positron lifetime spectroscopy” (1987)
    Springer
    Applied physics 43 (1987), S. 295-296 
    Details
    ISSN: 1432-0630
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract In the original paper by Schaefer et al. the assignment of positron lifetimes to monovacancies and vacancy agglomerates in Si has been discussed in order to interpret the lifetime of 402 ps observed in amorphous hydrogenated Si. In the present reply to the comment of Dannefaer, Mascher and Kerr we will demonstrate that a precise and critical discussion of the available data is indispensible.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00635186
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  • 14
    Electronic Resource
    Electronic Resource
    Sealing of bore-holes in Si crystals by epitaxial overgrowth below 560° C (1990)
    Springer
    Applied physics 50 (1990), S. 583-585 
    Details
    ISSN: 1432-0630
    Keywords: 81.10.D
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Liquid phase epitaxy (LPE) is applied to seal small bore-holes (diameter 250–400 μm) in Si crystals by lateral overgrowth. The overgrowth layers have a typical thickness of 20 μm, are mechanically stable and gas-tight. Using Ga as solvent for the LPE process the overgrowth can be performed at temperatures as low as 560°C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00323451
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  • 15
    Electronic Resource
    Electronic Resource
    The positron beam at the stuttgart pelletron accelerator and its applications toβ +γ positron lifetime measurements (1987)
    Springer
    Applied physics 43 (1987), S. 261-267 
    Details
    ISSN: 1432-0630
    Keywords: 78.70 ; 61.70 ; 07.77
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract A slow-positron source has been installed in the therminal of an electrostatic 6.5 MeV accelerator and provides a monoenergetic positron beam in the few-MeV range. It will be used to operate a “fast” positron lifetime spectrometer based onβ + γ coincidences. The properties of the beam, the expected performance of the spectrometer, its advantages over conventionalγγ lifetime measurements, a number of intended applications, as well as recent positron-electron scattering experiments and plans for positron channelling and channelling-radiation studies are outlined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00635181
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  • 16
    Electronic Resource
    Electronic Resource
    Zur Inhomogenität des inneren Feldes und der Flußdichte von kornorientierten Elektroblechen aus Silizium-Eisen bei Fehlorientierungen in der Blechebene (1989)
    Springer
    Electrical engineering 72 (1989), S. 51-57 
    Details
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Description / Table of Contents: Contents Starting from a model of a g.o. silicon-iron sheet with ideal goss-texture and an in-plane misoriented grain in the center the magnetization, the structure of the inner field and of the flux density in dependence on the external applied field are shown so that the deterioration of the flux guidance caused by such misoriented grains becomes visible.
    Notes: Übersicht Ausgehend von einem Modell eines kornorientierten Silizium-Eisenbleches mit idealer Goss-Textur und einem in der Blechebene fehlorientierten Korn im Zentrum werden die Magnetisierung, die Struktur des inneren Feldes und die Flußdichte berechnet. Die Struktur des inneren Feldes und der Flußdichte wird in Abhängigkeit vom aussteuernden Feld dargestellt, so daß die Verschlechterung der Flußführung durch derartig fehlorientierte Körner sichtbar wird.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01573569
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  • 17
    Electronic Resource
    Electronic Resource
    Zum Einfluß der Streufeldkopplung auf die magnetischen Eigenschaften und den Wirkungsgrad handelsüblicher Transformatorkerne aus kornorientierten Silizium-Eisen-Elektroblechen (1989)
    Springer
    Electrical engineering 72 (1989), S. 395-405 
    Details
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Description / Table of Contents: Contents From a survey of the important stray-field sources of a grain oriented M-shaped silicon-iron sheet follows that only the stray field at the air gap can give a remarkable contribution to the stray-field coupling. The influence of this air-gap stray fields on the magnetization structure and the magnetization reversal of a neighbouring sheet is investigated. From the shielding effect of the neighbouring sheet in dependence on the excitation in an applied field some statements concerning the influence of the stray-field coupling on the energy loss and the efficiency of the complete transformer core consisting of several sheets are derived and some proposals for the improvement of the efficiency during voltage transformation are given.
    Notes: Übersicht Aus einem vergleichenden Überblick über die wesentlichen Streufeldquellen eines M-Schnitt-Bleches aus kornorientiertem Silizium-Eisen folgt, daß nur das Luftspaltfeld einen merklichen Anteil zur Streufeldkopplung liefern kann. Der Einfluß dieses Luftspalt-Streufeldes auf die Magnetisierungsstruktur und den Ummagnetisierungsvorgang in einer benachbarten Blechlage wird untersucht. Aus einer Diskussion der abschirmenden Wirkung des benachbarten Bleches in Abhängigkeit von der Aussteuerung folgen Aussagen über den Einfluß der Streufeldkopplung auf die Energieverluste und den Wirkungsgrad des kompletten Transformatorkernes aus mehreren Blechlagen und Vorschläge zur Verbesserung des Wirkungsgrades bei der Spannungswandlung.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01573758
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  • 18
    Electronic Resource
    Electronic Resource
    Histochemical and biochemical determination of calcium in salivary glands of cat (1993)
    Springer
    Histochemistry and cell biology 100 (1993), S. 155-159 
    Details
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Although feline salivary glands have been used in investigations on secretion and microlithiasis and both processes involve calcium, nothing is known about its distribution in these glands. Therefore we have demonstrated the presence of calcium by a histochemical technique using glyoxal bis(2-hydroxyanil) and a biochemical technique using dry ashing. The histochemical technique stained serous acinar cells weakly and rarely found mucous acinar cells strongly in the parotid gland, mucous acinar cells moderately to strongly and serous acinar cells weakly in the sublingual gland, and central and demilunar acinar cells moderately to strongly in the submandibular gland. The biochemical technique revealed less calcium in the parotid than in the submandibular and sublingual glands. Both techniques revealed a decrease of calcium in submandibular and sublingual glands following parasympathetic stimulation. The histochemical distribution of calcium, which corresponds to that of acinar secretory glycoprotein, and the loss of calcium following parasympathetic stimulation, which causes release of secretory granules, indicate the presence of calcium in secretory granules. The concentration of calcium in the different types of acinar cell corresponds to the acidity of the secretory glycoprotein and suggests that calcium is present as a cationic shield to allow the condensation of polyionic glycoprotein in secretory granules.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00572902
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  • 19
    Electronic Resource
    Electronic Resource
    Ultrastructural immunocytochemical localization of neuron-specific enolase in parafollicular cells of the rat thyroid (1985)
    Springer
    Histochemistry and cell biology 83 (1985), S. 77-80 
    Details
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Using pre- and post-embedding procedures, neuron-specific enolase and calcitonin were localized in rat thyroid parafollicular cells by light and electron microscopy. Peroxidase-antiperoxidase (PAP), biotin-avidin (ABC) and protein A — colloidal gold techniques were used. In paraffin sections neuron-specific enolase was demonstrated in all calcitonin-storing parafollicular cells in rats aging 1 to 180 days. The post-embedding procedure failed to detect neuron-specific enolase in ultrathin sections, but the enzyme could be demonstrated using a preembedding procedure. Neuron-specific enolase was localized exclusively within the cytosol of parafollicular cells, while calcitonin was localized within secretory granules applying either post- or pre-embedding incubation techniques.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00495304
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  • 20
    Electronic Resource
    Electronic Resource
    Effect of hypercalcemia on parafollicular cells in the rat thyroid gland (1988)
    Springer
    Histochemistry and cell biology 88 (1988), S. 623-628 
    Details
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Hypercalcemia was induced in rats by the administration of A.T.10. We then determined the levels of total and ionized calcium and calcitonin in the serum, as well as performed ultrastructural observations and histochemical investigations of the calcitonin and neuron-specific enolase immunoreactivities in the stimulated parafollicular cells. The main aim of the study was to apply histochemical procedures to determine the immunoreactions of calcitonin gene-related peptide (CGRP), somatostatin and secretory protein-I in stimulated parafollicular cells. Immunoreactions of CGRP and calcitonin decreased strikingly in A.T.10-treated animals, whereas no visible changes were noted in somatostatin immunoreactivity. In the case of secretory protein-I, an insignificant increase of its immunoreactivity was observed in the treated animals. The cytophysiological significance of these results is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00570333
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