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  • 1975-1979  (44)
  • Polymer and Materials Science  (27)
  • Inorganic Chemistry  (17)
  • Synthesis
  • 1
    Electronic Resource
    Electronic Resource
    Zur Vermeidung von dynamischen Kraftmeßfehlern bei Neigungspendel-Kraftmeßeinrichtungen (1979)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 10 (1979), S. 449-455 
    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: The Prevention of Inertial Force Measurement Inaccuracies Encountered in Pendulum-type DynamometersTest machines, which are equipped with a force measuring device utilizing the inclining pendulum, are subject to dynamic measurement inaccuracies due to the inertia of the pendulum.The initial discussion demonstrates that the dynamic inaccuracy of measurement encountered with test machines using an inclining pendulum - force measurement device can only be calculated for the complete test machine/test piece configuration. With reference to the results of experiments, it will be proved that, as with the experiments carried out by Kravcenko, the indicated dynamic force and the dynamic force in the testpiece are antiphase and unequal.Additionally it will be shown that, through the experiment results, the equation from Schultze/Baumann for the permissible rate of test is confirmed only in the interpretation from Kravcenko.Further equations concerning the limitations of the rate of test are shown and their relevant fields of applications are discussed. Finally, factors are presented which stipulate a reduction of the permissible rate of test or permit an increase in this rate, dependent upon the force-elongation characteristic of the test piece and the measured variable under consideration.
    Notes: An Prüfmaschinen, welche Kraftmeßeinrichtungen mit Neigungspendeln besitzen, treten durch die Trägheit des Pendels dynamische Meßfehler auf.Es wird zunächst klargestellt, daß die dynamischen Meßfehler bei Prüfmaschinen mit Neigungspendel-Kraftmeßeinrichtungen nur für das Gesamtsystem Prüfmaschine/Probe berechnet werden können.Anhand von Versuchsergebnissen wird nachgewiesen, daß - entsprechend Untersuchungen von Kravčko - die angezeigte dynamische Kraft und die dynamische Probenkraft gegenphasig und ungleich sind. Außerdem wird gezeigt, daß durch die Versuchsergebnisse die Gleichg. von Schultze/Baumann für die zulässige Prüfgeschwindigkeit nur in der Deutung von Kravčko bestätigt wird.Weitere Gleichungen für Die Begrenzung der Prüfgeschwindigkeit wer den angegeben und ihr Einsatzbereich besprochen. Schließlich werden Faktoren angegeben, die je nach dem Kraft-Verlängerungs-Verhalten der Probe und je nach der gesuchten Meßgröße eine Verringerung der zulässigen Prüfgeschwindigkeit bedingen oder eine Vergrößerung der selben zulassen.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19790101209
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  • 2
    Electronic Resource
    Electronic Resource
    Compatibility of ABA poly(styrene-b-isoprene)/poly(2,6-dimethylphenylene oxide) blends (1978)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 22 (1978), S. 719-725 
    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: A variety of blends of ABA poly(styrene-b-isoprene) copolymers with poly(2,6-dimethylphenylene oxide) were prepared. Their compatibility was examined by measuring both the apparent modulus of rigidity and the loss tangent. Several blends showed a unique glass transition temperature between those of the individual components, which indicated compatibility. It was found that only those copolymers which phase separate are compatible with poly(2,6-dimethylphenylene oxide).
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1978.070220312
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  • 3
    Electronic Resource
    Electronic Resource
    Mechanical properties of bone cements containing large doses of antibiotic powders (1976)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 10 (1976), S. 929-938 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: The addition of up to 10 g gentamicin sulfate antibiotic powder to 60 g units of Simplex-P acrylic bone cement caused gradual, proportional decreases in the bulk mechanical properties of compressive and diametral tensile stengths. Water leaching of the antibiotic from the cement did not significantly decrease these strengths.Scanning electron microscopy (SEM) and energy-dispersive x-ray spectroscopy (EDS) showed the antibiotic to reside in the acrylic matrix as discrete particles not usually associated with internal porosity. The surface-sensitive flexural strength of a proprietary bone cement was lowered immediately by small quantities of antibiotic powder, and continued to decrease as doses of up to 10 g/unit were admixed. Water leaching caused channeling as the antibiotic was removed from the surface, but it did not create further changes in flexural strength.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820100610
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  • 4
    Electronic Resource
    Electronic Resource
    The influences of electrical potential and surface finish on the fatigue life of surgical implant materials (1975)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 9 (1975), S. 611-621 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: The influence of both imposed anodic potential in Ringer's solution and surface finish on the fatigue lives of annealed 316 type stainless steel and annealed pure titanium were measured and statistically compared to fatigue data run in air. The applied potentials in simulated extracellular fluid approximated conditions existing within the body while also producing the types of surface defects actually found on removed long time implants within the time interval of the accelerated R. R. Moore fatigue tests. Differentiating tests were run at single levels of applied cyclic stress well above the endurance limits.In Ringer's solution, the fatigue life of the 316 stainless steel decreased with increasing applied potential, and at +500 mV was significantly shorter than when run in air. At each condition, the 316 stainless steel was independent of initial surface finish. In contrast, the fatigue life of titanium improved rapidly with increasingly fine surface finishes. Furthermore, compared to air, the application of +500 mV in Ringer's solution improved the life of the rough surface finished material and markedly increased the number of cycles to failure for the electropolished specimens.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820090607
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  • 5
    Electronic Resource
    Electronic Resource
    Clinical influences on bone cement monomer release (1977)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 11 (1977), S. 859-869 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: Monomer losses for two self-curing acrylic cements were similar via laboratory serial weighing experiments. Both the P/L ratio and mixing duration substantially influenced subsequent monomer losses, but ambient temperature variation during mixing had little effect. Greater losses were encountered during the mixing and setting intervals than during the molding interval. Patient potential exposure to monomer occurs during the molding and setting intervals; therefore, handling procedures reducing losses in these intervals are important to the surgeon.The least monomer loss during both molding and setting occurred at the manufacturers' recommended P/L ratio, which strongly indicated the need to mix all contents supplied. Mixing loss increased with amount of spatulation. However, once the mass was well mixed (about 300 steady spatulations), no further decreases in the molding and setting interval losses were promoted by overmixing. Because of the lower monomer loss rate during the molding interval, postponed cement insertion may not be warranted in light of losing mechanical locking efficiency. The actual ramifications of a threefold reduction in potential patient exposure (3.5 down to 1.2 wt % of total monomer) via modified handling techniques have not yet been clinically evaluated.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820110606
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  • 6
    Electronic Resource
    Electronic Resource
    Über Oxoniobate (III). II [1, 2]. Notiz zur Kenntnis von NaNbO2 (1976)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 424 (1976), S. 128-132 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On Oxoniobates (III). II. On the Knowledge of NaNbO2New prepared NaNbO2 crystallizes hexagonal, a = 2.958, c = 11.58, c/a = 3.91, Z = 2, LiNbO2 type of structure. The oxygen parameter z0 is determined by systematic calculations of the Madelung Part of Lattice Energy, MAPLE, and Effective Coordination Numbers, ECoN: z = 0.1345.
    Notes: Neu dargestelltes NaNbO2 kristallisiert hexagonal, a = 2,958, c = 11,58 Å c/a = 3, 91, Z = 2, im LiNbO2-Typ. Der Sauerstoff-Parameter z0 wird durch systematische Berechnungen des Madelunganteiles der Gitterenergie, MAPLE, und von Effektiven Koordinationszahlen, ECoN, zu z0 = 0, 1345 bestimmt.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19764240206
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  • 7
    Electronic Resource
    Electronic Resource
    Über Oxoniobate(V): Die Kristallstruktur von CsNbO3 (1977)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 436 (1977), S. 75-86 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On Oxoniobates(V): The Crystal Structure of CsNbO3CsNbO3 crystallizes monoclinic with a = 5.148, b = 15,89, c = 9,143 Å, β = 93,3° (Z = 8, space group P21/c). The crystal structure contains [Nb4O12] groups, built up by four tetragonal pyramides, which are connected by two basis edges. The Madelung Part of Lattice Energy, MAPLE, and Effective Coordination Numbers, ECoN, have been calculated and are discussed.
    Notes: CsNbO3 kristallisiert monoklin mit a = 5,148, b = 15,89, c = 9,143 Å, β = 93,3° (Z = 8, Raumgruppe P21/c, Parameter siehe Text). Die Kristallstruktur wird durch [Nb4O12]-Gruppen bestimmt, die aus vier (über jeweils zwei Basiskanten verknüpften) tetragonalen Pyramiden bestehen. Der Madelunganteil der Gitterenergie, MAPLE, und Effektive Koordinationszahlen, ECoN, werden berechnet und diskutiert.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19774360108
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  • 8
    Electronic Resource
    Electronic Resource
    Halogen-Elpasolithe. III. Kubische und hexagonale Elpasolithe vom Typ Cs2LiMIIICl6 (MIII = Sc, Y, La-Nd, Sm-Lu, V, Cr, In) (1978)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 445 (1978), S. 147-151 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Halogeno-Elpasolites. III. Cubic and Hexagonal Chloro-Elpasolites: Cs2LiMIIICl6Chloro-Elpasolites of Cs2LiMIIICl6 formula type adopt, due to the ionic radius of M3+, several crystal structures: Cs2LiMCl6 (M = Y, La—Nd, Sm—Yb) are isotypic K2NaAlF6 Cs2LiScCl6 and Cs2LiInCl6 with Cs2NaCrF6, Cs2LiVCl6 and Cs2LiCrCl6 with Cs2LiGaF6. Cs2LiLuCl6 is dimorphic: several temperature-dependent transitions between HT-K2LiAlF6 and K2NaAlF6 structure types occur.
    Notes: Chlor-Elpasolithe vom Typ Cs2LiMIIICl6 gehören, abhängig vom Ionenradius r(M3+), verschiedenen Strukturtypen an: Cs2LiMCl6 (M = Y, La—Nd, Sm—Yb) dem kubischflächenzentrierten K2NaAlF6-Typ, Cs2LiScCl6 und Cs2LiInCl6 sind isotyp mit Cs2NaCrf6, Cs2LiVCl6 und Cs2LiCrCl6 mit Cs2LiGaF6; Cs2LiLuCl6 ist dimorph (mehrere temperaturabhängige Übergänge zwischen dem HT-K2LiAlF6- und dem K2NaAlF6-Typ).
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19784450118
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  • 9
    Electronic Resource
    Electronic Resource
    Die Kristallstruktur von CsTcO4 [1] (1976)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 420 (1976), S. 40-50 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Crystal Structure of CsTcO4CsTcO4 crystallizes orthorhombic with a = 5.727, b = 5.921 and c = 14.34 Å. Z = 4, space group Pnma (Nr. 62, I.T.). The metal positions were refined by single crystal data, the oxygen positions first determined: the CsTcO4 structure is a slight distortion of the scheelite arrangement (parameters: see text). The MADELUNG Part of Lattice Energy, MAPLE, „Mean Effective Ionic Radii“, MEIR, and Effective Coordination Numbers, ECoN, are calculated and discussed.
    Notes: CsTcO4 kristallisiert orthorhombisch mit a = 5,727, b = 5,921 und c = 14,34 Å, Z = 4, in der Raumgruppe Pnma (Nr. 62, I.T.). Die Lageparameter von Cs und Tc wurden aus Einkristalldaten verfeinert, die O-Positionen erstmals bestimmt (Parameter: vgl. Text). Es liegt eine Verzerrungsvariante des Scheelittyps vor. Der MADELUNG-Anteil der Gitterenergie, MAPLE, sowie „Mittlere Effektive Ionenradien“, MEIR, und Effektive Koordinationszahlen, ECoN, werden berechnet und diskutiert.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19764200105
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  • 10
    Electronic Resource
    Electronic Resource
    Zum thermischen Verhalten von Li3MnO4. II [1, 2]. Über α- und β- Li2MnO3 (1976)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 424 (1976), S. 257-264 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Thermal Behaviour of Li3MnO4. II. α- and β-Li2MnO3By thermal decomposition of Li3MnO4 we obtained two new forms of Li2MnO3: α-Li2MnO3 crystallizes due to Guinier-Simon photographs cubic face-centered with a = 4.092 Å, β-Li2MnO3 hexagonal with a = 4,93, c = 14.24 Å, c/a = 2.89. α-Li2MnO3 is paramagnetic with μ = 3,82 B.M. Below the Neel temperature (≈ 50 K) β-Li2MnO3 is antiferromagnetic. Effective Coordination Numbers, ECoN, are calculated and discussed.
    Notes: Durch thermische Zersetzung von Li3MnO4 wurden zwei neue Formen von Li2MnO3 erhalten: Nach Guinier-Simon-Aufnahmen kristallisiert α-Li2MnO3 kubisch-flächenzentriert mit a = 4,092 Å, β-Li2MnO3 hexagonal mit a = 4,93, c = 14,24 Å, c/a = 2,89. α-Li2MnO3 ist paramagnetisch mit μ = 3,82 B.M., β-Li2MnO3 ist unterhalb der NEEL-Temperatur von ≈ 50 K antiferromagnetisch. Effektive Koordinationszahlen, ECoN, werden berechnet und diskutiert.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19764240309
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