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  • Polymer and Materials Science  (11)
  • 1965-1969  (11)
  • 1930-1934
  • 1
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The enthalpy change accompanying the double helix-coil transition of polyriboadenylic acid (poly A) in aqueous solution has been measured optically and calorimetrically in the pH range 5.7-4.5. The course of this cooperative transition was followed optically by measuring changes in ultraviolet absorption as a function of temperature at different pH values, and calorimetrically by determining the heat capacity of the solution through the transition region. From the latter measurements, the enthalpy of transition was calculated. It is shown, that ΔH is dependent on pH as it is expected from the influence of protonation of the double helix of poly A.
    Additional Material: 4 Ill.
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  • 3
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-2: Polymer Physics 6 (1968), S. 91-109 
    ISSN: 0449-2978
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: From the sedimentation-diffusion equilibria of some polymer solutions the average molecular weights M̄n, M̄w, M̄z, and M̄z+1 have been determined in different ways. In particular, the applicability of Fujita's method, which utilizes concentration gradient values at the midpoint of the solution column at a number of rotor speeds, was examined. It appears that if the gradients at some other places in the column are also used, a smaller range of rotor speeds suffices. This method is generally applicable for determining the average molecular weights specified above.
    Additional Material: 11 Ill.
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  • 4
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-2: Polymer Physics 5 (1967), S. 461-470 
    ISSN: 0449-2978
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Proceeding from the work of Zimm and Stockmayer and of Benoit, a general formula is derived for the calculation of the radius of gyration of block and graft copolymers. It appears that with linear block copolymers the ratio of the mean-square radius of gyration and the mean-square end-to-end distance is usually not far from 1/6. With a great number of blocks the difference from 1/6 can entirely be neglected. Also the influence of the composition of the molecules on the scattered light intensity has been considered.
    Additional Material: 1 Tab.
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 16 (1965), S. 952-958 
    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: Observations on corroded parts of a stationary 10 MW gas turbineThe present contribution to the problem of high-temperature corrosion deals with the observations made on parts of the combustion chamber of a gas turbine driven by heavy oil. The corrosion phenomena encountered are mainly due to the hot combustion gases. Temporarily reducing conditions and the effects of sulphur lead, mainly to a reduction of the Cr content of the base material through the formation of sulphides and carbides and thus to a higher corrosion rate under oxidising condition.By way of experiment, the behaviour of six different heat-resistant materials of high strength at high temperatures was tested under normal working condition. The nickel-based alloy NiCr20Ti was found to show a lower corrosion rate than the materials with fe contents.
    Notes: Der vorliegende Beitrag zum Problem der Hochtemperaturkorrosion beschreibt die an Brennkammerteilen einer mit Schweröl betriebenen Gasturbine gemachten Beobachtungen. Es handelt sich vor wiegend um einen Angriff durch die heißen Brenngase. Zeitweise reduzierende Bedingungen und die Einwirkung von Schwefel führen vor allem zu einer Cr-Verarmung der Grundmasse durch Sulfid- und Carbidbildung und damit zu einem beschleunigten Angriff unter oxydierenden Bedingungen.Versuchsweise wurde das Verhalten von 6 verschiedenen hitzebeständigen und warmfesten Werkstoffen unter Betriebsbedingungen geprüft. Dabei zeigte die Ni-Basis Legierung NiCr20Ti einen schwächeren Angriff als die Fe- haltigen Materialien.
    Additional Material: 13 Ill.
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  • 6
    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: Dense calcium fluoride ceramics, a new refractory material for crucibles, resistance to hydrofluoric acidProduction, properties and applications of dross-cast calcium fluoride ceramics are described. These have two prominent characteristics: they are one of the rare substances not attacked by molten uranium;they represent the only ceramics material resistant to hydrofluoric acid.Because of this resistance, the material is ideal for crucibles used for the melting of enriched uranium or plutonium. The segregation capacity increases greatly as soon as densely-sintered crucibles are used. These completely non-porous vessels can, in the sizes suitable for industrial application, only be produced by the dross-casting method.Completely dense dross-cast calcium fluoride ceramics are being used where the absence of substances resistant to fluoride, hydrofluoric acid and fluorides at higher temperatures has so far precluded the application of these chemicals. They are already used with great success in fluorine atmosphere and at temperatures of about 1000°C.
    Notes: Herstellung, Eigenschaften und Verwendungsmöglichkeiten schlickergegossener Calciumfluoridkeramik werden beschrieben. Diese besitzt zwei hervorstechende Merkmale:Ihre Widerstandsfähigkeit macht sie zum idealen Gefäßmaterial für das schmelzen von angereichertem Uran und von Plutonium. Das Abscheidevermögen wächst außergewöhnlich stark an, sobald man dichtgesinterte Tiegel verwendet. Diese völlig porenfreien Gefäße können in für die industrielle Verwendung geeigneter Größe nur nach dem Schlickergußverfahren hergestellt werden. 1Sie ist einer der seltenen Stoffe, die nicht von geschmolzenem Uran ange-griffen werden.2Sie ist das einzige gegen Flußsäure beständige keramische MaterialVollständig dichte, schlickergegossene Calciumfluoridkeramik findet dort An-wendungsmöglichkeiten, wo bisher das Fehlen von gegen Fluor, Flußsäure und Fluoride bei höheren Temperaturen beständigen Stoffen die Verwendung dieser Chemikalien ausgeschlossen hat. In Fluoratmosphäre und bei Temperaturen von etwa 1000°C wurde sie bereits mit sehr gutem Erfolg eingesetzt.
    Additional Material: 12 Ill.
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 19 (1968), S. 837-844 
    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: Thermogravimetric method for investigating the solid/gas and melt/gas equilibria in sulphate systems of corrosion-chemical importanceThe authors describe a micro-thermogravimetric method which permits the determination of the phase zones of sulphate systems as a function of temperature and of the SO3-partial pressure. At the Me2SO4—SO3 (Me = Na, K) system, the existence limits of the bi-variant melt and the mono-variant equilibria Me2SO4(solid)-melt and Me2SO4(solid)-Me2S2O7(solid) are determined. Water vapour is dissolved in the melt phases investigated because the existence limits of the latter are modified by the vapour.
    Notes: Es wird eine mikro-thermogravimetrische Methode beschrieben, welche gestattet, die Phasenfelder von Sulfatsystemen als Funktion der Temperatur und des SO3-Partialdrucks zu ermitteln. Am System Me2SO4—SO3 (Me = Na, K) werden die Existenzgrenzen der bivarianten Schmelze und die monovarianten Gleichgewichte Me 2SO4 (fest)-Schmelze und Me2SO4 (fest)-Me2S2O7 (fest) bestimmt. Wasserdampf löst sich in den untersuchten Schmelzphasen, denn ihre Existenzgrenzen werden durch ihn verändert.
    Additional Material: 9 Ill.
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  • 8
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-2: Polymer Physics 6 (1968), S. 111-127 
    ISSN: 0449-2978
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A method has been developed for determining the molecular weight distribution of a polymer sample from the sedimentation-diffusion equilibrium data for a solution under pseudo-ideal conditions. From some theoretical examples it appears that the method works well and that the molecular weight distribution can be determined with a reasonable degree of resolution. From three polymer samples (polyethylene, polystyrene, and polycaprolactam) the molecular weight distribution was determined in this way. The average molecular weights, M̄n, M̄w, M̄z, and Mz+1, calculated from these distribution functions agree well with those calculated directly from the equilibrium data.
    Additional Material: 10 Ill.
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 20 (1969), S. 854-860 
    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: Corrosion protection by red lead priming coatsThe action of red lead, the oldest pigment known in corrosion protection, is due to a passivation involving the products of the primary corrosion of iron as well as the reaction products of red lead. In this context it is of particular advantage, that the two reactions are coupled, i.e. that the formation of the passivating layer starts only after the start of the corrosion of iron, the latter being due, in most cases, to the establishment of potential differences. A particular importance must also be attributed to the fact, that red lead does not allow the formation of local cells and thus improves the physical properties of the coating layer. The binding agent is of secondary importance, so that practically any binder can be used, e.g. linseed oil, chlorinated rubber, epoxy and urethan resins.
    Notes: Die Wirkungsweise von Bleimennige, dem ältesten bekannten Korrosionsschutzpigment, beruht auf einer Passivierung, an der die zunächst entstehenden Korrosionsprodukte des Eisens ebenso beteiligt sind wie die Reaktionsprodukte der Bleimennige. Hierbei ist von besonderem Vorteil, daß die beiden Reaktionen gekoppelt sind, d. h. daß die Deckschichtbildung erst dann einsetzt, wenn  -  meist infolge der Ausbildung von Potential-differenzen  -  die Korrosion des Eisens begonnen hat. Ebenso ist von Bedeutung, daß Bleimennige keine Lokalelementbildung zuläßt und daß sie neutralisierend wirkt, wodurch die physikalischen Eigenschaften des Anstrichfilms verbessert werden. Das Bindemittel spielt hierbei eine verhältnismäßig geringe Rolle, d. h. daß praktisch alle Bindemittel geeignet sind: Leinöl, Chlorkautschuk, Cyclokautschuk, Epoxyharze, Urethanharze.
    Additional Material: 11 Ill.
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  • 10
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: N-Hydroxyisocaproyl (HIC) amino acids are obtained by heating glycine or leucine with isocaprolactone in molten imidazole. The N-protected acids were coupled with leucine methylester respectively tyrosine benzylester using the mixed anhydride method. The HIC-group can be removed as isocaprolactone by 50 percent trifluoro-acetic acid during several hours at room temperature. 3-Nitrophenoxycarbonyl-chloride (3-NPOC-chloride), synthesized from 3-nitrophenol and phosgene was reacted with phenylalanine to give the 3-NPOC-derivative. This has been coupled with glycin-methylester and with glycyl-alanine benzylester. The 3-NPOC-group can be split off by irradiation with light of λ- 290 mμ or with weak alcali, but in case of peptide derivatives only ninhydrine-negative products were formed.
    Notes: Aus Glycin- bzw. Leucin-natrium wurden durch Erhitzen mit Isocaprolacton in der Imidazolschmelze die N-γ-Hydroxyisocaproylderivate (HIC-Aminosäuren) erhalten. Nach der Anhydridmethode wurden sie zu HIC-Glycyl-leucinmethylester bzw. HIC-Leucyl-tyrosylbenzylester gekuppelt. Die Abspaltung des Restes als Isocaprolacton gelang z. B. durch mehrstündiges Aufbewahren der Peptidderivate in 50-proz. Trifluoressigsäure. Aus 3-Nitrophenol wurde mit Phosgen das 3-Nitrophenoxycarbonylchlorid (3-NPOC-Chlorid) hergestellt, das mit Aminosäuren in wäßriger Lösung in Gegenwart von MgO zu N-3-NPOC-Derivaten reagiert. Durch Peptidsynthese erhielt man 3-NPOC-Phenylalanyl-glycinmethylester und 3-NPOC-Phenylalanyl-glycylalanylbenzylester. Die Schutzgruppe läßt sich aus den Aminosäurederivaten durch Bestrahlen mit Licht von λ 〉 290 mμ oder durch schwaches Alkali abspalten, bei Peptiden entstehen bei dieser Abspaltung nur ninhydrinnegative Produkte.
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