ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Preparation and characterization of microdisperse bioavailable carotenoid hydrosolsPaper presented at the meeting of the GdCH-Fachgruppe “Makromolekulare Chemie” on “Polymers and Biological Functions” in Bad Nauheim (West Germany) on April 18/19, 1988. (1989)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 166 (1989), S. 139-153 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The application of carotenoids as natural additives in various water-based or water-compatible formulations for the pigmentation of foods and feeds is seriously hampered by their insolubility in aqueous systems.Therefore, in order to develop the full potential of colour strength and to achieve a high degree of bioavailability during gastro intestinal passage, the coarse crystalline material has to be transformed into a microdisperse state.Exemplified with β-carotene, a novel non-mechanical process is described that transforms the carotenoids into a colloidal hydrosol characterized by an average particle size of about 0.1 μm.The process is based on the preparation of a transient high temperature solute state of the carotenoid in a water-miscible solvent, coupled with succeeding rapid aqueous precipitation in the presence of a stabilizing polymer colloid. The obtained hydrosols are characterized by photon-correlation-spectroscopy(size), and microelectrophoresis(colloidal stabilization).The bioavailability was tested by monitoring plasma levels of β-carotene in veal calves.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1989.051660110
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Heterocyclen als Liganden, VI: Die verbrückende Koordination eines 1,1′-Diazaferrocens in einem zweikernigen Silberkomplex  -  eine ungewöhnliche Struktur (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 2275-2277 
    Details
    ISSN: 0009-2940
    Keywords: 1,1′-Diazaferrocene coordination ; Silver complex ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Heterocycles as Ligands, VI1. - The Bridging Coordination of a 1,1′-Diazaferrocene in a Dinuclear Silver Complex - an Uncommon Structure[Ag2(μ-pyr2*Fe)2](BF4)2 · 2 MeOH (4, pyr* = C4Me4N) is obtained by reaction of pyr2*Fe · 2 Hpyr* (3) with AgBF4 in MeOH. The X-ray structure of 4 shows the bridging coordination mode of the diazaferrocene ligands with a nearly linear geometry at the silver atoms.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19891221212
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Polarographische Untersuchungen an Chinoxalin-N-oxidenHerrn Professor Dr. H. Berg zum 60. Geburtstag gewidmet (1985)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 327 (1985), S. 156-160 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Polarographic Investigations of Quinoxaline-N-oxides
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19853270123
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Thin liquid films: Fundamentals and applications. I. B. Ivanov, Ed., Marcel Dekker, Inc., New York, 1988, 1160 pp., $195.00 (1989)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 35 (1989), S. 1403-1404 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690350825
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Hochsiliciumlegierte austenitische Chrom-Nickel-Stähle - 20 Jahre BetriebserfahrungenPoster-Vortrag, European Corrosion Meeting EUROCORR '87, 6./10. 04. 87 Karlsruhe. (1987)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 18 (1987), S. 436-437 
    Details
    ISSN: 0933-5137
    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
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19870181211
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Sondermetalle und ihre Anwendung im ChemieapparatebauVeröffentlicht in DECHEMA-Monographie Bd. 103, Aktuelle Werkstoff- und Verarbeitungsfragen des Apparatebaus; 15. Konstruktionssymposium der DECHEMA am 15./16. 01. 1986. (1987)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 18 (1987), S. 139-147 
    Details
    ISSN: 0933-5137
    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: Refractory Metals and their Application in the Chemical Process IndustrySpecial metals, such as titanium, zirconium and tantalum, are being used increasingly for chemical plant. The exceptional resistance of special metals to many corrosive chemicals - they show it even at high temperatures and pressures - arises not from natural immunity but from the formation of a protective oxide passive layer on the metal surface.Special metals are well suited for welding. Their reactions with gases of the atmosphere must be taken into account though. Welding is therefore possible only under inert gas or a high vacuum. Similarly, alloying with iron-based materials during welding must be avoided under all circumstances. It should be taken into consideration that the melting point of tantalum, for example, is about twice as high as that of steel. Tantalum and niobium are machined with high-speed cutting steels; the cutting speed and cutting angle are similar to those used for stainless steels.In detail, the outstanding properties of special metals in chemical plant are as follows:  -  the stability of titanium under oxidizing conditions -  the stability of zirconium under reducing and alkaline conditions -  the resistance of molybdenum to hydrofluoric acid and fluoride -  the stability of tantalum under oxidizing and reducing conditions.In pure mineral acids the passive behaviour generally improves in the order titanium - zirconium - tantalum. Except where molybdenum is concerned, the medium should not contain fluoride.The material with the widest range of applications is tantalum. The addition of niobium as an alloying element leads to favourably priced but similarly resistant materials whose prospects of becoming established in the chemical industry and playing a part similar in importance to that of tantalum itself are good.
    Notes: Beim Bau von Apparaten für die chemische Industrie kommen in zunehmendem Maße Sondermetalle zur Anwendung, wie Titan, Zirconium und Tantal. Ihre ungewöhnliche Korrosionsbestädigkeit gegenüber vielen aggressiven Chemikalien-auch bei hohen Temperaturen und hohen Drücken - verdanken die Sondermetalle nicht einer natürlichen Immunität, sondern der Ausbildung einer schützenden oxidischen Passiv-Schicht auf der Metalloberfläche. Sondermetalle lassen sich gut schweißen. Allerdings ist dabei die Reaktion mit atmosphärischen Gasen zu berücksichtigen. Schweißen ist deshalb nur unter Edelgas oder im Hochvakuum möglich. Ebenso ist ein Legieren mit Eisenbasiswerkstoffen beim Schweißen unbedingt zu vermeiden. Dabei ist zu berücksichtigen, daß der Schmelzpunkt beispielsweise des Tantals etwa doppelt so hoch wie der des Stahls ist. Spanabhebend werden Tantal und Niob mit Schnellschneidstählen bearbeitet; Schnittgeschwindigkeit und Schnittwinkel entsprechen den von nichtrostenden Stählen.Herausragende Eigenschaften für den chemischen Apparatebau sind im einzelnen: -  Die Beständigkeit des Titans unter oxidierenden Bedingungen -  Die Beständigkeit des Zirconiums unter reduzierenden und alkalischen Bedingungen -  Die Beständigkeit des Molybdäns gegenüber Flußsäure und Fluorid -  Die Beständigkeit des Tantals unter oxidierenden und reduzierenden BedingungenDas Passiwerhalten nimmt in reinen Minerälsauren im allgemeinen in der Reihenfolge Titan - Zirconium - Tantal zu. Fluorid-Verunreinigungen sind (Ausnahme: Molybdän) zu vermeiden.Der Werkstoff mit dem breitesten Anwendungsspektrum ist Tantal. Durch Zulegieren von Niob entstehen kostengünstige, aber ähnlich korrosionsresistente Werkstoffe, die gute Chancen haben, sich in der chemischen Industrie zu etablieren und eine ähnlich wichtige Rolle wie das Tantal selbst zu spielen.
    Additional Material: 26 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19870180505
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Theoretical and experimental study of sedimentation in vertical flow tanks (1988)
    Weinheim : Wiley-Blackwell
    Chemical Engineering & Technology - CET 11 (1988), S. 95-104 
    Details
    ISSN: 0930-7516
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Settling characteristics of four different suspensions were measured by batch settling tests (glass spheres in glycerol-water mixtures and CaCO3) and by continuous settling test in a bench-scale vertical flow tank (activated sludge and kaolin in water), including the measurement of solids concentrations inside the tank. The characteristics could be described by different correlation functions which now include all the information about the settling behaviour of ideal suspensions. Continuous settling experiments in a bench-scale vertical flow tank were carried out with the same four material systems. These results correspond with sufficient accuracy to those from the theory of limiting flux if the settling characteristics determined earlier are considered.
    Additional Material: 15 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ceat.270110114
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Sondermetalle und ihre Anwendung im Chemieapparatebau (1987)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 18 (1987), S. 186-194 
    Details
    ISSN: 0933-5137
    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
    Additional Material: 26 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19870180608
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Werkstoffauswahl für schwefelsäureführende Rohrleitungen bei Anwendung des anodischen KorrosionsschutzesHerrn Prof. Dr. H.-J. Engell zum 60. Geburtstag gewidmet (1985)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 36 (1985), S. 489-501 
    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: Material selection for sulphuric acid pipes under condition of anodic corrosion protectionThe limit condition for anodic corrosion protection with regard to sulphuric acid concentration, temperature and flow velocity were to be determined within the framework of a joint project for the stainless austenitic steel grades 1.4541 and 1.4571 which are used as structural materials in sulphuric acid production, re-processing waste sulphuric acid and heat recuperation.Using gravimetric, electrochemical and surface analysis methods in sulphuric acid of 67 to 98% by mass it was possible to demonstrate on flat and rotating disks specimens that current and potential oscillations occur at open-circuit potential above a certain critical temperature in sulphuric acids of more than 90% by mass. These harmful oscillations were prevented by the use of anodic protection. If anodic protection is applied, both steel grades can withstand exposure to concentrated sulphuric acid at temperatures up to 140°C. The behaviour of the molybdenum-free material were found to be better than those of the Mo-containing material. There are optimum protective potential ranges for both materials, depending on concentration and temperature. The results of surface analysis showed, among other things, that the salt layers formed on the two materials are of different thickness and that the thickness of the oxide layers is dependent on the potential.Using anodic corrosion protection, its is thus possible to use inexpensive materials in concentrated sulphuric acid at temperatures of up to 140 °C.
    Notes: Im Rahmen eines gemeinsamen Forschungsvorhabens sollten für die nichtrostenden austenitischen Stähle 1.4541 und 1.4571, die als Konstruktionswerkstoffe bei der Schwefelsäure-Produktion, der Aufarbeitung von Abfallschwefelsäure und der Wärmerückgewinnung eingesetzt werden, die Grenzbedingungen für den anodischen Korrosionsschutz hinsichtlich der Schwefelsäurekonzentration, der Temperatur und der Strömungsgeschwindigkeit ermittelt werden.Mittels gravimetrischer, elektrochemischer und oberflächenanalytischer Untersuchungen in Schwefelsäure mit 67 bis 98 Massenanteilen in Prozent konnte an Streifen- und rotierenden Scheibenproben nachgewiesen werden, daß beim Freien Korrosionspotential in Schwefelsäuren ≥ 90 Mass-% ab einer „kritischen“ Temperatur Strom- und Potentialoszillationen auftreten. Durch die Anwendung des anodischen Schutzes können die schädlichen Oszillationen verhindert werden. Bei Anwendung des anodischen Schutzes lassen sich beide Stähle in konzentrierten Schwefelsäuren bis 140 °C einsetzen. Die Mo-freien Werkstoffe verhalten sich hierbei günstiger als Mo-haltige. Es gibt in Abhängigkeit von der Konzentration und der Temperatur für beide Werkstoffe optimale Schutzpotentialbereiche. Die oberflächenanalytischen Untersuchungen zeigten u.a., daß sich je nach Werkstoff unterschiedlich dicke Salzdeckschichten und in Abhängigkeit vom Potential unterschiedlich dicke oxidische Deckschichten ausbilden.Durch die Anwendung des anodischen Korrosionsschutzes lassen sich somit preiswerte Werkstoffe in konzentrierter Schwefelsäure bis 140°C sicher einsetzen.
    Additional Material: 36 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19850361104
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Werkstoffe für die Salpetersäure-IndustrieHerrn Professor Dr. Hubert Gräfen zum 60. Geburtstag gewidmet (1986)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 37 (1986), S. 57-69 
    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: Materials for the nitric acid industryParticularly demanding requirements are imposed on components exposed to nitric acid. Where metallic materials are concerned, attention must be paid not only to general corrosion, but also to intergranular and selective attack in many cases.A distinction is made between three sectors for which different materials are employed: aSubazeotropic and azeotropic nitric acids not contaminated with oxidants,bSubazeotropic and azeotropic nitric acids containing oxidants, such as chromates, andcSuperazeotropic, primarily highly-concentrated nitric acids.The advantages and disadvantages of the materials used in the three sectors, namely austenitic chromium-nickel-(molybdenum) steels, high-silicon austenitic chromium-nickel steels, iron-silicon casting materials, glass-lined steel, glass, aluminum (alloys), titanium, zirconium, tantalum-niobium alloys, tantalum and platinum, are illustrated.Special features to be considered in corrosion tests on steel grades resistant to nitric acid are also described.
    Notes: An salpetersäurebeaufschlagte Bauteile werden besonders hohe Anforderungen gestellt. Bei den metallischen Werkstoffen sind neben abtragender Korrosion häufig auch interkristalliner und selektiver Angriff zu beachten.Es werden drei Bereiche aunterazeotrope und azeotrope, nicht mit Oxidationsmitteln verunreinigte Salpetersäuren,bunterazeotrope und azeotrope, Oxidationsmittel, wie Chromate, enthaltende Salpetersäuren undcüberazeotrope, vornehmlich hochkonzentrierte Salpetersäure unterschieden, für die unterschiedliche Werkstoffe zum Einsatz gelangen.Die Vor- und Nachteile der in den drei Bereichen verwendeten Werkstoffe: austenitische Chrom-Nickel-(Molybdän)-Stähle, hochsiliciumlegierte austenitische Chrom-Nickel-Stähle, Eisen-Silicium-Gußwerkstoffe, emaillierter Stahl, Glas, Aluminium-(Legierungen), Titan, Zirconium, Tantal-Niob-Legierungen, Tantal und Platin werden herausgestellt.Die bei der Korrosionsprüfung salpetersäurebeständiger Stähle zu beachtenden Besonderheiten werden beschrieben.
    Additional Material: 36 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19860370202
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...