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  • Polymer and Materials Science  (12)
  • Physics  (9)
  • hot corrosion  (4)
  • NMR  (3)
  • Nuclear Reactions  (3)
  • Lysophosphatidylcholine  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Comparisons of lipid dynamics and packing in fully interdigitated monoarachidoylphosphatidylcholine and non-interdigitated dipalmitoylphosphatidylcholine bilayers: cross polarization/magic angle spinning ^1^3^+C-NMR studies
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/Biomembranes 1026 (1990), S. 225-235 
    Details
    ISSN: 0005-2736
    Keywords: Cross polarization/magic angle spinning ; DSC ; Dipalmitoylphosphatidylcholine ; Interdigitated bilayer ; Lysophosphatidylcholine ; NMR
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0005-2736(90)90068-Y
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  • 2
    Electronic Resource
    Electronic Resource
    Biophysical correlates of lysophosphatidylcholine- and ethanol-mediated shape transformation and hemolysis of human erythrocytes. Membrane viscoelasticity and NMR measurement
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/Biomembranes 1027 (1990), S. 163-171 
    Details
    ISSN: 0005-2736
    Keywords: Erythrocyte shape ; Ethanol ; Hemolysis ; Lysophosphatidylcholine ; Membrane viscoelasticity ; Micropipette aspiration ; NMR
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0005-2736(90)90080-8
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  • 3
    Electronic Resource
    Electronic Resource
    Identification of two new suprofen metabolites in human urine
    Amsterdam : Elsevier
    Journal of Pharmaceutical and Biomedical Analysis 12 (1994), S. 569-571 
    Details
    ISSN: 0731-7085
    Keywords: HPLC ; MS ; NMR ; Suprofen ; TLC ; drug metabolism. ; human ; urinary metabolites
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Medicine
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0731-7085(94)80034-0
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  • 4
    Electronic Resource
    Electronic Resource
    The corrosion of Ni3Al in a combustion gas with and without Na2SO4-NaCl deposits at 600–800°C (1994)
    Springer
    Oxidation of metals 42 (1994), S. 265-284 
    Details
    ISSN: 1573-4889
    Keywords: Ni3Al intermetallic compound ; combustion gas ; hot corrosion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The corrosion behavior of Ni3Al containing small additions of Ti, Zr, and B in combustion gases both with and without Na2SO4−NaCl deposits at 600–800°C has been studied for times up to four days. The corrosion of the saltfree Ni3Al leads to the formation of very thin alumina scales at 600°C but of mixed NiO−Al2O3 scales containing also some sulfur compounds at higher temperatures, while the rate increases with temperature up to 800°C. The presence of the salt deposits considerably accelerates the corrosion rate, especially at 600 and 800°C. The duplex scales formed at 600°C are composed mostly of a mixture of NiO and unreacted salt in the outer layer and of alumina and aluminum sulfide with some nickel compounds in the inner layer. The scales grown at 700°C contain only one layer of complex composition, while those grown at 800°C are similar but have an additional outer layer containing similar amounts of nickel and aluminum. At 600 and 700°C NiSO4 can be detected also in the salt layer. The samples corroded at 700°C and 800°C also show an Al-depleted zone containing titanium sulfide precipitates at the surface of the alloy. The hot corrosion of Ni3Al involves a combination of various mechanisms, including fluxing of the oxide scale as well as mixed oxidation-sulfidation attack. At all temperatures Ni3Al shows poor resistance to hotcorrosion attack as a result of the formation of large amounts of Ni compounds in the scales.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01052027
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  • 5
    Electronic Resource
    Electronic Resource
    The corrosion of Nb-modified Ti3Al in a combustion gas with and without Na2SO4−NaCl deposits at 600–800°C (1994)
    Springer
    Oxidation of metals 42 (1994), S. 393-408 
    Details
    ISSN: 1573-4889
    Keywords: Nb-modified Ti3Al ; combustion gas ; hot corrosion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The corrosion behavior of a Nb-modified Ti3Al intermetallic compound containing 11 at.% Nb in a simulated combustion gas with and without deposits of a Na2SO4−NaCl mixture was examined at 600–800°C for times up to four days. In the absence of salt deposits the corrosion rates were rather low and increased only slightly with temperature, producing very thin scales of mixed oxides of Ti, Al, and Nb without sulfides. The presence of the salt deposits produced higher weight gains during an initial stage of one to two days at 600 and 700°C, after which the reaction stopped. A more important and longlasting effect was observed instead at 800°C, when the kinetics of hot corrosion became nearly linear. The scales formed by hot corrosion were complex mixtures of various corrosion products at all temperatures and showed a porous outer region containing a mixture of unreacted salts with oxides (mainly TiO2), an intermediate region of a mixture of variable composition of oxides of the three metals, and a TiO2-rich layer beneath it. At 800°C the scales tended to form a thin, discontinuous Al2O3-rich layer in the middle and contained an additional innermost region presenting a large concentration of sulfur, very likely as Nb and Ti sulfides. The high rate of hot corrosion at 800°C is attributed to the appearance of sulfides in the inner region of the scale and to a more efficient scale fluxing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01046757
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  • 6
    Electronic Resource
    Electronic Resource
    Acidic and basic fluxing of Ni-base superalloys in a 90Na2SO4-10K2SO4 melt at 1173 K (1983)
    Springer
    Oxidation of metals 19 (1983), S. 201-229 
    Details
    ISSN: 1573-4889
    Keywords: Acidic and basic fluxing ; hot corrosion ; sulfate melt ; superalloys
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The influence of the electrode potential on the corrosion behavior of a series of Ni-base superalloys has been investigated in a (mole %) 90Na2SO4-10K2SO4 melt at 1173 K. Acidic fluxing occurs at positive potentials and basic fluxing at negative potentials. A protective scale is formed in an intermediate (neutral) potential range on high chromium-containing alloys such as IN-738LC, IN-939, IN-597, and IN-657. The breakthrough potentials for acidic and basic fluxing depend on the composition of the alloy. Alloys with low chromium contents such as IN-100 and IN-713LC do not form stable protective scales at any potential. Numerous sulfide phases have been identified in the scale and subscale, depending on potential, severity of attack, and material composition. NaCrS2 only forms under basic fluxing conditions. Its presence can therefore be considered as an indication that basic fluxing conditions have existed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00666645
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  • 7
    Electronic Resource
    Electronic Resource
    Role of platinum in the Na2SO4-Induced hot corrosion resistance of aluminum duffusion coatings (1984)
    Springer
    Oxidation of metals 22 (1984), S. 59-81 
    Details
    ISSN: 1573-4889
    Keywords: Al-diffusion coating ; platinum ; hot corrosion ; acidic and basic fluxing ; sulfate melt
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Electrochemical corrosion measurements have been carried out with Pt-containing and Pt-free Al-diffusion coatings on IN 738 LC in a 90Na2SO4+ 10K2SO4 (mol%) melt at 1173 K. Pt improves the resistance to basic fluxing while there are no significant differences between both coating types in their resistance to acidic fluxing. The corrosion resistance of the Pt-containing coating is also higher in the passive potential region where protective scales rich in Al2O3 are formed. The reason for the different behavior of both coating types appears to be related to the high corrosion resistance of the Pt-rich surface layer of the coating and an increased Al2O3 content in the scale of the Pt-containing type.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00659249
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  • 8
    Electronic Resource
    Electronic Resource
    Inhibition of Hot Corrosion by MgSO4 and BaSO4 and its potential dependence (1984)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 35 (1984), S. 139-149 
    Details
    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: Inhibition der sulfat-induzierten Heißgaskorrosion durch MgSO4 und BaSO4 und ihre PotentialabhängigkeitElektrochemische Korrosionsuntersuchungen wurden mit IN 100 in einer Schmelze aus (Mol-%) 90 Na2SO4—10 K2SO4 mit verschiedenen Zusätzen an MgSO4 und BaSO4 bei 1173 K durchgeführt, um die Inhibition dieser Verbindungen und ihre Potentialabhängigkeit zu untersuchen. Es wurden sowohl potentiostatisch kontrollierte als auch Versuche beim Freien Korrosionspotential mit Messung des Polarisationswiderstandes durchgeführt.Die Inhibition von MgSO4 ist stark potentialabhängig. Bei negativen Potentialen, bei denen in elektrochemischen Nebenreaktionen Sauerstoffionen gebildet werden, wird MgO auf der Werkstoffoberfläche abgeschieden und teilweise in die Zunderschicht eingebaut. Diese MgO-reiche Zunderschicht ist beständig gegen basischen Aufschluß, weil MgO in basischen Schmelzen unlöslich ist. Bei positiven Potentialen, bei denen durch Entladen von SO4-Ionen die Säure SO3 entsteht, wird keine oder nur sehr geringe Inhibition gefunden.Zusätze von BaSO4 allein ergeben keinen Inhibitionseffekt. Zusätze von BaSO4 zu einer MgSO4-haltigen Schmelze verbessern jedoch erheblich die Inhibitionswirkung von MgSO4. Der Mechanismus dieses synergistischen Effektes wird nicht vollständig verstanden.
    Notes: Electrochemical corrosion measurements have been performed with IN 100 in a (mole %) 90 Na2SO4—10 K2SO4 melt with different additions of MgSO4 and BaSO4 at 1173 K in order to investigate the inhibition effect of these compounds and its potential dependence. Potentiostatically controlled measurements as well as free corrosion potential measurements with the determination of the polarization resistance have been performed.The inhibition effect of MgSO4 is strongly potential dependent. At negative potentials, where oxygen ions are produced by electrochemical side reactions, MgO is precipitated at the surface of the metal and becomes incorporated into the scale. This kind of MgO-rich scale is resistant to basic fluxing because MgO is not dissolved in basic media. At positive potentials, where acid SO3 is produced by discharge of SO4-ions, MgSO4 yields no or only very little inhibition.BaSO4 additions alone do not yield inhibition effects. However, additions of BaSO4 to melts containing MgSO4 improve the inhibition effect of the latter. The mechanism of this synergistic effect is not completely understood.
    Additional Material: 25 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19840350402
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  • 9
    Electronic Resource
    Electronic Resource
    Effect of surfactants on the particle sizes of red#170 polyurea microcapsules (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 52 (1994), S. 1165-1173 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Red#170 (pigment) polyurea microcapsules have been successfully prepared at our laboratory. Both core and shell of these microcapsules are demonstrated to be red#170 pigment and polyurea, respectively, by infrared (IR) spectra. The number-average particle sizes of these microcapsules are seen to decrease with increasing concentration and the ethylene oxide chain length of nonylphenylpolyoxyethylene ether (NPn; n = 6, 8, 10, 12, 16) as an emulsifier in the water phase used for making microcapsules. Experimental results indicate that the average particle sizes of red#170 polyurea microcapsules are smaller for the system with NP16 than for the system with NP4 (in the oil phase) and/or NP16 (in the water phase) and that, in the presence of NPn, these particle sizes are seen to be slightly smaller for use of methylcellulose than for use of sodium carboxymethylcellulose as a protective colloid. It is also interesting to note that the released amounts of red#170 pigment from polyurea microcapsules in di-n-butylphthalate solvent is lower for a system with NP16 than for a system with methylcellulose, as a result of good emulsification leading to decrease the interaction between toluene diisocyanate and water molecules. This may further cause more crosslinkage to take place at the urea groups, resulting in a decrease in the porosity of the capsules. © 1994 John Wiley & Sons, Inc.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1994.070520816
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  • 10
    Electronic Resource
    Electronic Resource
    Interface effects on moisture absorption in ultrathin polyimide films (1998)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 36 (1998), S. 155-162 
    Details
    ISSN: 0887-6266
    Keywords: polyimides ; reflectivity ; moisture absorption ; Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Water absorption in thin films (〈1000 Å) of a commercial polyimide was evaluated by monitoring dimensional changes induced by a humid environment. Film thickness was measured using x-ray reflectivity, which is a nondestructive technique offering angstrom resolution in the measurements of thin film or multilayer thickness. The effect of several variables on the absorption of moisture were monitored in polyimide films adhered to polished silicon substrates, including total dry film thickness, exposure time, and the contribution of a coupling agent. The percentage increase in film thickness due to moisture uptake is found to be a weak function of dry film thickness, decreasing as dry film thickness increases, and to be somewhat affected by the use of an interfacial coupling agent. The observed behavior points to the polymer/substrate interface as a strong factor controlling the absorption of moisture in the polyimide/silicon system, and is believed to reflect the presence of a highly moisture-saturated interfacial layer. A bilayer model is proposed, and the feasibility of using this model to describe the observed behavior is considered. Published 1998 John Wiley & Sons, Inc.This article is a US Government work and, as such, is in the public domain in the United States of America. J Polym Sci B: Polym Phys 36: 155-162, 1998
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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