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  • 1975-1979  (99)
  • Chemistry  (94)
  • Inorganic Chemistry  (17)
  • Life and Medical Sciences  (5)
  • 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
    Polyketones and polysulfones for conservation of ethylene polymers (1977)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 17 (1977), S. 335-339 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    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: Because of the increase in cost of foreign oil, ethylene costs have increased markedly within the last several years. There is presently a sizeable incentive to reduce raw material costs for basic polymer manufacture. The polyketones, synthesized from ethylene and CO, and the polysulfones, synthesized from ethylene and SO2, both utilizing high energy radiation, offer one such possibility. The process has the additional advantage that CO and SO2, usually considered as.wastes and pollutants from fossil fuel burning power plants, are converted to useful materials. The polyketones and polysulfones formed by radiation-induced polymerization from the gas phase below 100°C have been found to be high molecular weight polymers which, depending on composition, either melt with difficulty or decompose at temperatures of 250°C or higher. The higher temperature (〉100°C) catalyst-induced reaction produces low molecular weight waxes. Design calculations indicate that for a G value of 10, 000 and 50 percent energy deposition efficiency, it would take 331 megacuries of Co6O to conserve 2 billion pounds of ethylene or 25 percent of the overall U.S. consumption in the PE market by substituting CO and SO2. This savings amounts to as much as $280 million at today's market price. Electron machine radiation with a 25 percent energy deposition efficiency requires a total beam power of 9800 KW. The use of machine radiation is preferred because of safety, availability, and lower initial investment. The challenge presented by the development of these substituted polymer systems depends on (1) the determination of the uniqueness of the radiation process and confirming the yields with electron machine radiation, (2) the processability and market acceptability of the substituted polymers, and (3) the ability to design an efficient radiation process reactor.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760170512
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  • 3
    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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  • 4
    Electronic Resource
    Electronic Resource
    Temperature development in the leakage flow of screw extruders (1978)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 18 (1978), S. 288-292 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    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: Temperature distribution at the exit of the leakage gap is of interest for a number of problems. For the calculation of temperatures, the leakage flow may be considered to be a pure drag flow to a good approximation. In the Newtonian case, thermal development length may be expressed in terms of gap height as L ≈ 3/8Pe · δ;usually this is less than the available gap length. Pe is the Peclet number and δ the height of leakage gap. Therefore the existing flow may be considered fully developed. For power law fluids, numerical calculations lead to results of the same order. Martin's results therefore may be applied to the flow at the exit of the leakage gap.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760180409
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  • 5
    Electronic Resource
    Electronic Resource
    Adhesive properties of star-shaped block copolymers (1977)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 17 (1977), S. 803-805 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    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: Star-shaped block copolymers were used as heat activated adhesives in glass to glass joints. The branches consisted in either AB or ABA poly(styrene-b-isoprene) block copolymers. Tensile shear strengths of simple lap joints were measured for star block copolymers differing in the length or in the number of branches. Values higher than those of the corresponding linear species were obtained. These results were related to the presence of chemical junction points created by coupling the linear copolymers.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760171108
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  • 6
    Electronic Resource
    Electronic Resource
    Dynamics of mixed populations having complementary metabolism (1975)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 17 (1975), S. 1065-1081 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The dynamics of a system of two microbial populations having complementary metabolism are investigated by means of simple mathematical models of growth. Complementary metabolism as used here means that each population produces a substance - not present in the initial or feed medium - required by the other for growth. The simple models indicate that (1) something other than lack of the substrate or growth factor produced by its partner must limit the growth of at least one population and (2) the coexistence steady state of such populations in continuous culture is not stable with respect to large perturbations, though it is stable with respect to a wide range of perturbations.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260170709
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  • 7
    Electronic Resource
    Electronic Resource
    Comments on microbial growth rate (1975)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 17 (1975), S. 279-283 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260170214
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  • 8
    Electronic Resource
    Electronic Resource
    Experimental evaluation of analytical and Smith predictors for distillation column control (1979)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 25 (1979), S. 24-32 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Two time delay compensation techniques, the Smith predictor and the analytical predictor, are used for bottom composition control of a pilot scale methanol-water distillation column. The closed-loop performance of the two predictor schemes is compared to that for a proportional-integral controller in experimental and simulation studies. The predictors resulted in improved control for both set point and feed flow disturbances.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690250103
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  • 9
    Electronic Resource
    Electronic Resource
    Mass transfer from swarms of bubbles or drops with chemical reactions in continuous phase (1976)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 22 (1976), S. 925-927 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690220519
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  • 10
    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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