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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 23 (1992), S. 197-200 
    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: A Laser-Interferometer for Non-contacting Measurements of Displacements in the Range of NanometersA prototype laser-interferometer with a computer-aided control and evaluation system was developed and attached to a commercial tensile testing equipment for testing. With microhardness indentations as markers it is possible to determine displacement changes with a resolution of about one nanometer. The capabilities of this test system are demonstrated e.g. by measurements of the static Young's modulus, the determination of the crack opening behaviour and the coefficient of thermal expansion of Cu-specimens.
    Notes: Ein Laser-Interferometer mit einem rechnergestützten Auswerteverfahren wurde in einer Prototypentwicklung an eine kommerzielle Zugprüfmaschine angepaßt und erprobt. Mit Hilfe von als Meßmarken dienenden Mikrohärteeindrücken erlaubt dieses Meßsystem. Abstandsänderungen mit einer Auflösung von etwa 1 Nanometer zu bestimmen. Die Funktionsfähigkeit dieser Meßanordnung wird an Beispielen der E-Modulmessung der Bestimmung des Rißöffnungsverhaltens und des Wärmeausdehnungs-koeffizienten von Cu-Proben demonstriert.
    Additional Material: 5 Ill.
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  • 2
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 10 (1976), S. 571-581 
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: A cementable endosteal blade implant has been developed and evaluated. Inherent in the design are the following factors: minimization of stress concentrators, ease of implantation, and high resistance to loosening. Other potential advantages of this design as compared with conventional endosteal blade implants include reduced hazards of postoperative infection and reduced likelihood of metallic corrosion.Six conventional endosteal implants and six cementable implants were installed in steer mandibles using standard dental surgical techniques and Simplexbrand methyl methacrylate bone cement. They were loaded in uniaxial compression at a loading rate of 0.0122 in./min. The stiffness (S), deformation at 900-lb load (D900), proportional limit (PL), and load at 0.04 in. deformation (L0.04) were calculated for each test.The cementable design showed a twofold increase in stiffness, only 17% of the deformation at 900 lb, more than twice the proportional limit, and at least twice the load at 0.04 in. deformation when compared with similar values for the conventional endosteal implants.This study reveals that, in addition to being unstable in bone, conventional endosteal implants are also unstable when used with acrylic bone cement. The new design should eliminate most of the problems associated with endosteal blade implantation.
    Additional Material: 6 Ill.
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  • 3
    Electronic Resource
    Electronic Resource
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 30 (1992), S. 1355-1361 
    ISSN: 0887-624X
    Keywords: polyether ; cesium ; phenoxide ; liquid crystalline ; dibromodecane ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The synthesis of a poly(azine-ether) via Williamson etherification using the cesium salt of 4-hydroxyacetophenone azine and 1,10-dibromodecane was carried out in N-methyl-2-pyrrolidone. The heterogeneous reaction proceeded readily at temperatures from ambient to 150°C. Polymers of varying molecular weight with essentially alkyl bromide end groups were produced either by changing the polymerization temperature or by using an excess of the organic substrate. The thermal stability of the polymers was molecular weight dependent and those with the highest DPn exhibited monotropic nematic mesomorphism.
    Additional Material: 4 Ill.
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  • 4
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Letters Edition 24 (1986), S. 263-268 
    ISSN: 0887-6258
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 5 Ill.
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  • 5
    Electronic Resource
    Electronic Resource
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 30 (1992), S. 91-97 
    ISSN: 0887-624X
    Keywords: main-chain liquid crystalline polymers ; nematic ; mesophase ; sulfonate ; ionomer ; synthesis ; characterization ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Liquid crystalline polymers containing sodium sulfonate groups pendant to the polymer backbone were synthesized by an interfacial condensation reaction of brilliant yellow, a sulfonate-containing monomer, with 4,4′-dihydroxy-α,α′-dimethyl benzalazine and a 50/50 mixture of sebacoyl and dodecanedioyl dichlorides. Polymers containing up to ca. 4 mol% brilliant yellow were characterized by elemental analysis and ultraviolet spectroscopy. The polymers were thermally stable to about 300°C, and they exhibited a broad nematic mesophase region of 70-100°C. The solution viscosity behavior in chloroform suggested that intramolecular associations of the sulfonate groups occurred at low polymer concentrations and intermolecular associations predominated at higher concentrations.
    Additional Material: 9 Ill.
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  • 6
    Electronic Resource
    Electronic Resource
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 30 (1992), S. 989-996 
    ISSN: 0887-624X
    Keywords: main chain liquid crystalline polymers ; nematic ; mesophase ; sulfonate ; ionomer ; synthesis ; characterization ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Liquid crystalline ionomers containing sulfonate groups on the terminal unit of the chain were synthesized by an interfacial condensation reaction of 4,4′-dihydroxy-α,α′-dimethyl benzalazine, the monofunctional dye fast yellow (FY), and a 50/50 mixture of sebacoyl and dodecanedioyl dichlorides. The weight-average molecular weights were estimated from inherent viscosity measurements to be between 6000-11,000 and the sodium sulfonate concentrations ranged from 0-18.4 meq/100 g polymer. Elemental analyses, however, indicated much higher molecular weights, which suggested that there was a distribution of chains with one, two, or no FY endgroups. The polymers were semicrystalline and melted at ca. 140°C to form nematic mesophases that were stable over a temperature range of ca. 80°C. They were thermally stable to about 350°C. The ionomeric nature of the polymers was confirmed by the presence of intermolecular associations in nonpolar solvents, as demonstrated by dilute solution viscosity measurements.
    Additional Material: 6 Ill.
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  • 7
    Electronic Resource
    Electronic Resource
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 30 (1992), S. 1051-1060 
    ISSN: 0887-624X
    Keywords: polyamides ; naphthidine ; liquid crystalline polymers ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A number of polyamides and model amides based on 3,3′-dimethylnaphthidine and various dicarboxylic acids were synthesized in N-methylpyrrolidone containing lithium chloride either by low temperature solution or by direct polycondensation using triphenyl phosphite and pyridine. The polyamides had inherent viscosities of 0.36-5.42 dL g-1 and were, in general, readily soluble in N-methylpyrrolidone. Amorphous members exhibited relatively high glass transition temperatures in the range of 340-380 and 200-230°C for aromatic and aliphatic polymers, respectively. All polyamides showed good thermal stability in nitrogen and in air.
    Additional Material: 4 Ill.
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  • 8
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Letters Edition 24 (1986), S. 552-553 
    ISSN: 0887-6258
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 26 (1995), S. 483-487 
    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: Plastoermüdungs- und Kriechverhalten von rekristallisiertem Molybdän im RaumtemperaturbereichDas Verformungsverhalten von reinem rekristallisierten Molybdan Blech unter zyklischer und statischer Beanspruchung wurde im Temperaturbereich zwischen 30°C und 100°C, unter Zug-Druck Spannungsamplituden zwischen 100 MPa und 250 MPa, sowie unter Zugbeanspruchung bis 200 MPa untersucht. Die Ergebnisse zeigen, daß Molybdan trotz der niedrigen Prüftemperaturen und Spannungen ein beträchtliches plastisches Verformungsvermögen aufweist, das empfindlich von der Prüffrequenzzeit und von geringfügigen Veranderungen in der Prüftemperatur abhängt. Die Aktivierungsenergie für die statischen und dynamischen Verformungsvorgänge berechnet sich zu weniger als 0,98 eV, was auf thermisch aktivierte Verformungsprozesse deutet. Diese Prozesse konnten auf der Grundlage eines in der Literatur beschriebenen Versetzungskinkenmodells erklärt werden. Das zyklische Plastizitätsverhalten bei den niederen Prüftemperaturen erscheint durch Wechselwirkungen von Kriech- und Ermüdungsvorgangen beeinflußt zu sein.
    Notes: The deformation behavior of pure recrystallized molybdenum under cyclic and static loads was investigated in the temperature range between 30°C and 10O°C, for stress amplitudes between 100 MPa and 250 MPa and for static loads up to 200 MPa. The results show that in spite of the low test temperatures and stress levels the Mo material exhibits considerable plastic strains which depend sensitively on frequenez and small changes in temperature.The activation energy deduced for the static and dynamic deformation is less than 0.98 eV which indicates thermally activated processes, to be explained by a dislocation kink model as described in the literature. The low-temperature fatigue behavior appears strongly influenced by creep-fatigue interaction phenomena.
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  • 10
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 41 (1990), S. 91-103 
    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: Acid-base interactions were used to enhance the miscibility of blends of polystyrene and oligomeric poly(alkylene oxide). The polystyrene was modified by sulfonation of less than 5% of the styrene rings. The poly(alkylene oxides) were low molar mass polyethylene oxide chains (M = 900 and 6000) that were end capped with propyl amine groups. Blends of the poly(alkylene oxide) diamines with polystyrene were immiscible. Blends with the sulfonated polystyrenes were miscible due to proton transfer from the sulfonic acid groups to the basic amino groups of the functionalized poly(alkylene oxide). This was confirmed by FTIR. DSC and dynamic mechanical analyses were used to verify the one- or two-phase nature of the blends.
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