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  • 1
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    International Journal of Mass Spectrometry and Ion Processes 84 (1988), S. 255-269 
    ISSN: 0168-1176
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Microchimica acta 54 (1966), S. 646-652 
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Wie neuerlich gezeigt wurde, sind die Konduktanz- und Susceptibilitäts. kurven bei Hochfrequenzmessungen, ausgedrückt als Funktion des Logarithmus der Elektrolytkonzentration nur von den physikalischen Parametern der Meßzelle abhängig. Der Debye-Effekt spielt keine signifikante Rolle.
    Abstract: Résumé On donne une nouvelle preuve que les courbes caractéristiques de la conductance et de la susceptance des mesures en haute fréquence, exprimées en fonction du log de la concentration de l'électrolyte, ne dépendent que des paramètres physiques de la cellule de mesure, et que l'effet Debye ne joue qu'un rôle minime.
    Notes: Summary New evidence is given that the characteristic conductance and susceptance curves of high frequency measurements, expressed as a function of the log of the electrolyte concentration, depend only on the physical parameters of the measuring cell, and the Debye effect plays only an insignificant role.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Microchimica acta 48 (1960), S. 678-684 
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary Polybasic acids were determined with NH4OH by high frequency titrimetry. Relations were found between the character of the titration curves and the dielectric constants of the solutions. Carbonate and bicarbonate were determined in the presence of each other. Several examples are cited also of iodometric titrations.
    Abstract: Résumé Dosage d'acides polybasiques par titrimétrie haute fréquence à l'aide d'ammoniaque. L'allure de la courbe de titrage est fonction de la constante diélectrique de la solution. Les carbonates et les carbonates acides sont déterminés en présence les uns des autres. Les auteurs donnent également quelques exemples de titrages iodométriques.
    Notes: Zusammenfassung Mehrbasische Säuren wurden mit NH4OH hochfrequenztitrimetrisch bestimmt. Hierbei ergaben sich Zusammenhänge zwischen dem Charakter der Titrationskurve und der Dielektrizitätskonstante der Lösung. Carbonat und Hydrogencarbonat wurden nebeneinander bestimmt. Auch einige Beispiele jodometrischer Titrationen werden angeführt.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Journal of low temperature physics 106 (1997), S. 315-320 
    ISSN: 1573-7357
    Keywords: 74.80Fp ; 74.25Jb
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We study the scattering of quasiparticles at a normal metal—superconductor interface using Bogoliubov-de Gennes equations, taking the motion parallel to the interface fully into account. We show that while the Andreev reflection is the dominant scattering process in case of nearly perpendicular impacts (as predicted by the semiclassical theory), the normal reflection becomes increasingly important for quasiparticles with large momenta parallel to the interface, and the semiclassical approximation becomes progressively inadequate. We work out consequence of this feature for spectra of bound states in superconductor—normal metal—superconductor junctions.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Astrophysics and space science 217 (1994), S. 149-150 
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We investigated the distribution of Neugebauer and Leighton's two micron survey (TMSS) stars on the {K - [12];[12] - [25]} and {[12] - [25];[25] - [60]} planes. The frequency of circumstellar emission objects among B-K type stars is less than 5% while it reaches about 20% at M , 80% at stars with unknown spectra and 90% at carbon stars.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Space science reviews 47 (1988), S. 399-403 
    ISSN: 1572-9672
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Microchimica acta 50 (1962), S. 309-313 
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary A new titer substance is proposed for determining acids, namely methylglucamine (1-desoxy-l-methylamino sorbitol). Methylglucamine is a weak base whose dissociation constant is 1.5 · 10−5 and has many advantages as compared with ammonium hydroxide which has been generally used up till now. Among others, factor-stable standard solutions can be prepared by simple weighing out of the quite water-soluble solid base. The high frequency method is applied for indicating the endpoint of the titration.
    Abstract: Résumé Les auteurs proposent une nouvelle substance titrimétrique, la méthylglucamine (méthylamino-1, desoxy-1 sorbitol), pour le dosage des acides. La méthylglucamine est une base faible dont la constante de dissociation est de 1,5 · 10−5. Elle présente de nombreux avantages par rapport à l'hydroxyde d'ammonium généralement utilisé. On peut préparer des solutions étalons stables, à partir de la base solide, facilement soluble dans l'eau, par simples pesées. Pour déterminer le point équivalent du titrage, on a utilisé la haute fréquence.
    Notes: Zusammenfassung Die Verfasser bringen zur Bestimmung von Säuren eine neue Titersubstanz, das Methylglukamin (1-Desoxy-1-methylamino-sorbit), in Vorschlag. Methylglukamin ist eine schwache Base mit der Dissoziationskonstante 1,5 · 10−5 und zeigt dem bisher allgemein angewandten Ammoniumhydroxyd gegenüber zahlreiche Vorteile. Unter anderem können faktorstabile Maßlösungen aus der gut wasserlöslichen festen Base durch einfache Einwaage hergestellt werden. Zur Endpunktanzeige der Titration wurde die Hochfrequenzmethode verwendet.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Microchimica acta 48 (1960), S. 118-126 
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary A study was made of the lower concentration limits at which it is possible to conduct acid-base and precipitation titrations with the high-frequency titrimeter operating at 130 MHz. It was found that the lower limit of the possibility of determining hydrochloric acid is1 μg/ml, of acetic acid 20, of chloride 2, and sulfate 10. With respect to the choice of the titrant, the writers believe it important to use such reagents with which the direction tangent show the maximum change in indication at the equivalent point.
    Abstract: Résumé Les auteurs ont cherché à déterminer les limites inférieures de concentration pour lesquelles les titrages acide-base et les titrages par précipitation restaient possible avec un titrimètre haute fréquence travaillant à 130 MHz. Ils ont établi que ces limites inférieures étaient de 1μg/ml pour l'acide ehlorhydrique de 20μg/ml pour l'acide acétique de 2μg/ml pour les chlorures et de 10μg/ml pour les sulfates. En ce qui concerne les liquides titrants ils considèrent que ces réactifs ne sont intéressants que lorsque au voisinage du point équivalent la direction de la tangente change de signe aussi nettement que possible.
    Notes: Zusammenfassung Die unteren Konzentrationsgrenzen der Durchführbarkeit von Säure-, Basen- und Fällungstitrationen mit dem bei 130 MHz arbeitenden Hoch-frequenztitrimeter wurden untersucht. Dabei wurde festgestellt, daß die untere Grenze der Bestimmungsmöglichkeit bei Salzsäure 1, bei Essigsäure 20, bei Chlorid 2 und bei Sulfat 10μg/ml beträgt. Bezüglich der Wahl der Titrierflüssigkeit halten wir die Anwendung solcher Reagenzien für wichtig, bei denen die Richtungstangente im Äquivalenzpunkt möglichst ihr Vorzeichen ändert.
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Astrophysics and space science 134 (1987), S. 211-217 
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A ring-shaped infrared emission region is recognizable on the IRAS Sky Flux images of a Cepheus region which happens to include the association Cepheus OB 2. The ring is easily visible both at 60 and 100 microns. The approximate galactic coordinates of its centre arel=102°.8 andb=+6°.7, with an outer diameter of 7 deg. IC 1396 and several otherHii regions, such as S 129, S 133, S 134, and S 140 are apparently parts of the ring. If it is assumed that these Hii regions are physically connected to the ring its distance must be about 900 pc and its diameter 120 pc. The existence of several arc-shaped Hα filaments along the ring, the proper motion of the nearby runaway star λ Cephei, and the possible presence of the [Fex] λ6375 interstellar line in the spectra of two stars of Cep OB 2 combine to suggest that the infrared ring might well be a result of a supernova explosion which occurred in this region about 2–3 million years ago.
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  • 10
    ISSN: 1573-8191
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Spectral observations of 53 Hα-emission objects of the HII-region IC 1396 were carried out with moderate resolution using the 2.6m telescope of the Byurakan Astrophysical Observatory. Factor analysis of this observational material indicates that there are two dominant factors. Factor 1 (Fig. 1), which is the more significant factor, resembles the spectrum of a star of spectral type F5 with a strong Hβ line in absorption. Factor 2 (Fig. 2), in contrast, appears as a later-type spectrum with Hα and Hβ in emission. The result obtained can be explained by the transient nature of the Hα-emission.
    Type of Medium: Electronic Resource
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