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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Langmuir 8 (1992), S. 2567-2571 
    ISSN: 1520-5827
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Langmuir 9 (1993), S. 3313-3316 
    ISSN: 1520-5827
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Research in nondestructive evaluation 10 (1998), S. 205-225 
    ISSN: 1432-2110
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract. An experimental study of hidden corrosion detection by using ultrasonic guided waves is presented combined with a BEM numerical simulation. Both corrosion simulation specimens by machine cutting and real corrosion specimens by electrochemical processing were used in the investigation, with a range of corrosion depths from 0.02 to 0.4 mm (1.5 to 20% of the original plate thickness). Various wave modes were subsequently generated on these specimens to examine the implications of thinning on mode cutoff, group velocity, and transmission and reflection amplitudes. The transmission and reflection of guided waves upon entering the corrosion zone were simulated by a hybrid BEM calculation that combines a normal mode expansion technique of Lamb waves for far fields with the boundary element representation for the scattered near fields. A quantitative technique for hidden corrosion depth with guided waves is developed based on a frequency compensation concept. The estimated depth of the real corrosion by this method shows good agreement with that by an optical microscope.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 18 (1967), S. 15-20 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Thio urea derivatives as vapour-phase corrosion inhibitorsThe authors have investigated the effect of allylthiourea, phenylthiourea, tetramethylthiuram monosulphide, N-phenyl-N'-p-tolylthiourea, tetramethylthiuram disulphide, diphenylthiourea and quinolin as corrosion inhibitors of mild steel in moisture saturated air. It was possible to find a relationship between the shift of the electrode potential towards more positive values and the inhibition effect as well as the degree of adsorption. In the anodic range, the polarisation change is less marked than in the cathodic range. Inhibition at the vapour phase always calls for adsorption; in addition, however, the wetting and hydrophobisation of the surface also play an important part. A comparison with the potentials and polarization values obtained from immersion tests gives rise to the assumption that, in an aqueous medium, the inhibition mechanism is different.
    Notes: Die Verfasser untersuchten die Wirkung von Allylthioharnstoff, Phenylthioharnstoff, Tetramethylthioharnstoff, Tetramethylthiurammonsulfid, N-Phenyl-N'-p-tolylthioharnstoff, Tetramethylthiuramdisulfid, Diphenylthioharnstoff, Chinolin als Inhibitoren der Korrosion von Weichstahl in feuchtigkeitsgesättigter Luft. Dabei konnte eine Beziehung zwischen der Verschiebung des Elektrodenpotentials nach positiveren Werten und der Hemmwirkung sowie dem Adsorptionsgrad gefunden werden. Die Polarisation wird im anodischen Bereich weniger stark verändert als im kathodischen Bereich. Die Inhibierung in der Dampfphase setzt immer eine Adsorption voraus, doch spielen daneben auch die Benetzung und Hydrophobisierung der Oberfläche eine wichtige Rolle. Ein Vergleich mit den in Tauchversuchen ermittelten Potential- und Polarisationswerten läß vermuten, daß im wäßrigen Medium der Inhibierungsmechanismus ein anderer ist.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Acta mechanica 114 (1996), S. 203-216 
    ISSN: 1619-6937
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The three-dimensional Poisson-Voronoi model, which is topologically equivalent to the microstructure of real ceramics and metals, has been used to study the stress distribution within a simulated polycrystalline aggregate having 200 grains. Micro-stresses such as the maximum principal stress, maximum shear stress, first invariant of stress, and Von-Mises stress are found to vary systematically with the anisotropy of single crystal.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 183 (1961), S. 172-177 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Amperometric ascorbimetric determinations of cerium(IV) and ferric iron have been carried out at 50°C with two polarized electrodes at 200 and 100 mV respectively. The results obtained are fairly accurate and precise within ±1.0 per cent. A simple method for successive determination of cerium and iron has been developed; and conditions for such estimations have been established. At an acidity of 2.5 M with respect to sulphuric acid, it is possible to ward off the reduction of ferric iron and thereby cerium(IV) is successfully titrated with ascorbic acid in this medium. After completion of the reaction and then lowering the acid concentration to pH 1.5 with aid of ammonium hydroxide, FeIII is titrated with standard ascorbic acid yielding good results.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Journal of Physical Organic Chemistry 8 (1995), S. 341-343 
    ISSN: 0894-3230
    Keywords: Organic Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Oscillations of electrical potential differences across the liquid-liquid interface in phase-transfer catalyst systems are reported. The occurrence of the oscillations is consistent with the Starks' shuttling mechanism.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 321 (1963), S. 81-84 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zirkon wurde durch potentiometrische acidimetrische Titration der bei der Umsetzung seines Hydroxids mit KF freiwerdenden Hydroxidionen bestimmt. Zur Titanbestimmung eignet sich diese Methode nicht. Be, Al, La, Th und Kationen der II. Gruppe stören, während Cr, Ni, Co, Zn und Mu selbst in größerer Menge ohne Einfluß auf die Genauigkeit sind. Diese Methode ist schnell, einfach und ergibt befriedigende Ergebnisse.
    Notes: The potentiometric acidimetric determination of zirconium is based on the interaction between its hydroxide and KF yielding hydroxide ions which are determined with standard HCl as titrant. This method is not suitable for the estimation of titanium. The presence of Be, Al, La, Th and second group cations interfere. However, the presence of Cr, Ni, Co, Zn and Mn even in larger quantities does not affect the accuracy of the results. The method is quick, simple, specific and yields satisfactory results.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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