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  • 1
    Electronic Resource
    Electronic Resource
    Mold-filling studies for the injection molding of thermoplastic materials. Part I: The flow of plastic materials in hot- and cold-walled circular channels (1975)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 15 (1975), S. 553-568 
    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: A finite difference analysis has been developed which predicts the temperature, pressure, and velocity distributions for the flow of thermoplastic materials in straight and tapered, hot and cold walled circular flow channels. This analysis when combined with the cavity filling analysis described in Part II, gives the molding engineer the capability of modeling the injection molding process from the shot to the cavity during injection. The information that is obtained from these analyses is useful in equipment design and modification since it allows numerical experiments to be performed so that one may ascertain the effects on moldability of flow channel and cavity geometry, material properties, and operating conditions. In addition, the information is useful in problem diagnosis and analysis to ascertain causes of and evaluate potential solutions to molding problems.
    Additional Material: 15 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760150802
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A theoretical study of the hyperpolarisabilities of nickel dithiolene molecules (1992)
    New York, NY [u.a.] : Wiley-Blackwell
    Advanced Materials for Optics and Electronics 1 (1992), S. 221-228 
    Details
    ISSN: 1057-9257
    Keywords: Hyperpolarisabilities ; Nickel Dithiolene ; Non-linear optical properties ; CNDO method ; Finite field method ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: The hyperpolarisabilities γ of nickel dithiolene complexes have been calculated by the finite field method in combination with the CNDO/S molecular orbital method. This computational technique, which has been developed for calculating the polarisation of large organic molecules by a perturbing electric field, is discussed. The changes in γ that occur as a result of different selections of substituent groups in the dithiolene ligand are described. The results are compared with recent experiments investigating these types of molecules. Large values for γ are found to arise from the interaction of the nickel 3d electrons with the conjugated π-electrons of the metal-ligand complex.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/amo.860010503
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  • 3
    Electronic Resource
    Electronic Resource
    Mold-filling studies for the injection molding of thermoplastic materials. Part II: The transient flow of plastic materials in the cavities of injection-molding dies (1975)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 15 (1975), S. 569-582 
    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: A practically-oriented computer model which computes the temperature, pressure, and velocity fields in a cavity during the mold filling portion of the injection molding process is described. The model is structured so that it can be used for cavities having non-simple shapes and for commonly used molding compounds with complicated viscosity, shear rate, temperature relationships. Predictions from the model are found to be in good agreement with results obtained from exact solutions to special cases. Model predictions in molding problems have been found to correctly describe trends such as an increase in the pressure required to fill molds as injection rate, shot temperature, and mold temperature decrease, and to be reasonably accurate when compared to data for plaque, disc, and telephone housing molds over a wide range of molding conditions. Some illustrative examples of the use of the model in solving real molding problems are provided.
    Additional Material: 25 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760150803
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  • 4
    Electronic Resource
    Electronic Resource
    Enantiomerenreine schaufelradartige Spiro-PorphyrazinoctaolderivateProfessor Dieter Seebach zum 60. Geburtstag gewidmet Wir danken der Glaxo Group Research Ltd. für Unterstützung (A. G. M. B.), der Wolfson Foundation für die Gründung des Wolfson Centre for Organic Chemistry in Medical Science am Imperial College, dem Engineering and Physical Sciences Research Council, der National Science Foundation, NATO, der Foundation for Research and Development (South Africa) sowie Zeneca für die großzügige Unterstützung unserer Untersuchungen. (1997)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 109 (1997), S. 806-807 
    Details
    ISSN: 0044-8249
    Keywords: Chiralität ; Cyclovoltammetrie ; Porphyrinoide ; Schutzgruppen ; Spiroverbindungen ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19971090732
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  • 5
    Electronic Resource
    Electronic Resource
    The effect of aromatic plasticisers on the photo-dehydrochlorination of poly(vinyl chloride) (1982)
    Brookfield, Conn. : Wiley-Blackwell
    Journal of Vinyl and Additive Technology 4 (1982), S. 150-156 
    Details
    ISSN: 0193-7197
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A comparison has been made of the effect of ultraviolet and solar radiation on plasticised and unplasticised PVC. It has been shown that, when the polymer, plasticised with either a phthalate or trimellitate ester, is exposed to short-wavelength ultraviolet radiation (〈292 nm), the photodehydrochlorination of the polymer is retarded by the plasticiser. It has also been shown that, when longer-wavelength radiation is used, the dehydrochlorination is accelerated by the plasticiser. In each case, the effect of the trimellitate is greater than that of the phthalate. Possible mechanisms for the reactions at both long and short wavelengths are considered, and the role of the plasticiser is explained in terms of its electronic absorption spectrum.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/vnl.730040407
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  • 6
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    Further photometric observations of 2A 0311-227 (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Simultaneous V, B, and U photometry is presented for the AM Herculis type system 2A 0311-227. A Fourier analysis has failed to detect the 6 minute quasi-periodic oscillation reported earlier. It has, however, revealed the presence of oscillations at 20.2 and 13.7 minutes. These are interpreted in terms of a nonsinusoidal light curve. U, B, and V light curves are given and discussed in terms of current models for AM Her systems. B-V and U-B color curves are also presented, as is the behavior of the system in the color-color plane.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; vol. 252
    Format: text
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  • 7
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    Light curve of the optical counterpart of 2A0311-227 (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Visual and blue light curves are presented for the optical counterpart of the X-ray source 2A0311-227. This system, which is the newest member of the AM Herculis class of binaries, has an orbital period of 81 minutes which also modulates the visual light curve. A Fourier analysis of the data has revealed the presence of a 6-minute oscillation, at least in the visual light curve. Whether or not it is also present in the blue light curve is unclear.
    Keywords: ASTROPHYSICS
    Type: Astronomical Society of the Pacific; vol. 92
    Format: text
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  • 8
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    Optical counterpart of 2A0311-227 (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Spectrophotometric observations of the optical counterpart of the X-ray source 2A0311-227 are reported. A 1.3-m telescope associated with a photon-counting spectral scanner was used for observations in the range 4000 to 5800 A. Strong emission features are noted for H I, He II at 4686 A and the C III-N III blend at 4640-4650 A. Analyses of radial velocities show the star to be a spectroscopic binary with a period of 81.04 + or - 0.01 min, while blue and yellow light curves reveal variations in stellar color. Similarities between this binary and AM Herculis are noted and a model of a 1.2-solar mass white dwarf with a 0.2-solar mass companion at a separation of 0.7 solar radii is suggested.
    Keywords: ASTROPHYSICS
    Type: Nature; 281; Sept. 6
    Format: text
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  • 9
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    Rapid oscillations in cataclysmic variables. VIII - YY Draconis (=3A 1148 + 719) (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: A 16th magnitude cataclysmic variable presumably a dwarf nova, was detected near one of the positions permitted for the hard (2-10 keV) X-ray source 3A 1148 + 719. The optical and UV spectra of YY Dra are fairly typical of cataclysmic variables, except that the TiO absorption bands of an M dwarf can be seen for greater than 5000 A. This shows that the accretion disk is intrinsically faint in quiescence, suggesting a very low accretion rate. Yet the fairly blue continuum slope in the vacuum UV indicates the presence of a small hot object, presumably the white dwarf. The radial velocities at H-alpha indicate a 4.0-hr orbital period, and the IR light curve appears to show the expected 'double-humped' waveform from the distorted secondary. High-speed photometry in the U band reveals a stable periodicity of about 1-percent semiamplitude at a period of 275 s, with some power also in the subharmonic at about 550 s.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 392; 1 Ju
    Format: text
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