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  • 1
    Electronic Resource
    Electronic Resource
    Splitting theorems for certainPD 3-groups (1984)
    Springer
    Mathematische Zeitschrift 186 (1984), S. 201-209 
    Details
    ISSN: 1432-1823
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01161804
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  • 2
    Electronic Resource
    Electronic Resource
    The cyclization of mouse satellite DNA (1971)
    Springer
    Chromosoma 33 (1971), S. 284-296 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Sheared fragments of mouse satellite DNA can form rings and other circular structures by several techniques. „Folded rings“ are formed if the sheared fragments are simply annealed, indicating that shearing produces single-chain terminals, and that the repetitious sequence is shorter than the exposed ends. The occurrence of folded rings can be sharply reduced by prior treatment with single-chain specific endonuclease, and significantly increased if the fragments are treated with exonuclease III. Denaturation of satellite DNA followed by reassociation of the single chains results in the formation of “slipped rings”. These characteristics of the DNA lead to the conclusion that the sequences of the mouse satellite DNA are arranged in a tandemly repetitious manner.-About 20% of the DNA fragments from the “main band” cyclize after partial exonuclease III degradation, but not before this treatment. This indicates that a large fraction of the main band DNA is tandemly repetitious, but that the length of the repetitious sequence is on the average longer than the single-chain terminals produced by shearing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00284946
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  • 3
    Electronic Resource
    Electronic Resource
    Isolation and properties of a Lyt-2.1-negative mutant of a Lyt-2.1/Lyt-2.2 CTL line (1991)
    Springer
    Immunogenetics 34 (1991), S. 42-51 
    Details
    ISSN: 1432-1211
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00212311
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  • 4
    Electronic Resource
    Electronic Resource
    Prospects for in-process diagnosis of metal cutting by monitoring vibration signals (1987)
    Springer
    Journal of materials science 22 (1987), S. 3821-3830 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Vibration signals from various metal cutting processes in e frequency range of a few Hz to several MHz have been investigated by many researchers for their possible application to an in-process cutting condition monitoring system and some remarkable laboratory results have been reported. In spite of many very interesting demonstrations of feasibility in laboratories, numerous attempts to apply the technology to manufacturing conditions have not been very successful. The main objectives of this brief review are to summarize the key points of various published reports and to discuss the critical technical issues which are hindering transformation of the laboratory results to more broadly applicable technology. The vibration signals from metal cutting processes contain very useful information and offer excellent possibilities for in-process diagnosis of many critical metal cutting problems including tool wear. But the current state of knowledge still consists mainly of empirical observations, many of which need further clarification. Sonna of these key issues requiring future studies, particularly those issues related to in-process monitoring of tool wear, are discussed in this review.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01133328
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  • 5
    Electronic Resource
    Electronic Resource
    Cytoscription: Computer controlled micropositioning of cell adhesion proteins and cells (1994)
    Springer
    Methods in cell science 16 (1994), S. 189-192 
    Details
    ISSN: 1573-0603
    Keywords: Cell adhesion ; Cell adhesion proteins ; Computers ; Fibronectins ; Morphogenesis ; Tissue engineering
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Methods are described for the computer controlled micropositioning of both mammalian cells and cell adhesion proteins. Cell adhesion proteins can be micropositioned by using cell adhesion proteins instead of ink in an inkjet printer. Cells can be positioned with a computer controlled X-Y translation table and a fluorescence activated cell sorter (FACS).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01540648
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  • 6
    Electronic Resource
    Electronic Resource
    Monitoring the quality of mix of polymer melts with particulate fillers using fluorescence spectroscopy (1989)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 29 (1989), S. 1759-1765 
    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: Fluorescence spectroscopy has been employed to monitor the mixing of polymer melts with filler material. The polymer melts were low molecular weight polybutadiene and PBAN, a terpolymer consisting of 85% butadiene, 11% acrylonitrile, 4% acrylic acid, and the filler material was aluminum oxide. To carry out the fluorescence observations, a dopant chromophore was mixed into the polymer melt at very low concentrations, 10-4 to 10-6 molar or 11 to 0.11 ppm by weight. The mixing experiments were carried out using a small laboratory mixer which had glass walls for viewing the fluorescence spectra from the dopant chromophore. Fluctuations in fluorescence intensity were observed to decrease as a function of mixing time indicating that the spatial distribution of the fluorescent chromophores was becoming more uniform. Concerning the mixing of polymer melt and filler, we hypothesize that uniform mixing of ingredients is achieved when fluorescence intensity as a function of time is constant. In order to obtain quantitative support for this hypothesis, we used a fluorescence microscope to measure fluorescence intensity and optical transmittance from microscopic regions of well-mixed and poorly mixed specimens.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760292405
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  • 7
    Electronic Resource
    Electronic Resource
    In-line optical monitoring of polymer injection molding (1994)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 34 (1994), S. 671-679 
    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: An optical sensor, consisting of optical fibers to transmit light to and from the mold cavity, was constructed for the purpose of measuring the onset of polymer solidification during injection molding. The sensor was used to detect characteristic fluorescence radiation from a dye which had been doped into the resin at very low concentration. By measuring changes in fluorescence intensity it was possible to detect whether the state of the resin was liquid or solid. We observed that, as the resin cooled in the mold, the onset of solidification was indicated by highly characteristic and distinct changes in the fluorescence intensity/time profile. Application of the method involved the use of a calibration relationship between the fluorescence intensity and temperature of the doped polymer in order to determine the distict features which characterize the onset of solidification. Injection molding of a glass forming polymer (polystyrene) and a crystallizable polymer (polyethylene) was monitored by this technique.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760340809
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  • 8
    Electronic Resource
    Electronic Resource
    Moisture and ion sorption in cellulose acetate (1963)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 7 (1963), S. 1933-1942 
    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: Measurements described in this paper show that the effective water permeation coefficients of silver paste electrodes on polymers such as cellulose acetate are of about the same magnitude as those of the polymer itself and, therefore, that such electrodes will have negligible effect on moisture penetration when conditioning periods of several hours or longer are used. X-ray emission spectrography with Kα radiation from chlorine and potassium was employed to determine the salt content of 0.267-mm. cellulose acetate films (about 100 acetyl groups per polymer molecule = 40% acetyl), which were soaked for 48 hr. in aqueous solutions ranging up to 1M in concentration of the alkali chlorides or potassium halides. Typically, the salt contents are about 100 ppm or 3 μmole/g. of cellulose acetate. The actual salt contents are discussed in relation to ionic hydration, and Stokes' radii via the differential hydration energy concept of Samoilov and the phenomenological developments of Nightingale. The evidence suggests that ionic motion in moisture-swollen cellulose acetate is quite similar to that in aqueous solution.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1963.070070528
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  • 9
    Electronic Resource
    Electronic Resource
    Solidification sensing for closed loop control of injection molding hold time (1996)
    Hoboken, NJ : Wiley-Blackwell
    Advances in Polymer Technology 15 (1996), S. 151-163 
    Details
    ISSN: 0730-6679
    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
    Notes: Hold time for injection molding is currently controlled open loop, using a fixed time delay set by the machine operator. Insufficient hold time leads to inconsistent moldings, while excessive hold time increases the cost of the part. We have developed new sensors that monitor the solidification of polymer in the mold. A closed loop strategy is demonstrated where the hold time is automatically controlled based on feedback from a solidification sensor. Using this strategy, the hold time is set once in reference to the sensor signal, providing the minimum proper hold time for each part under changing processing conditions. © 1996 John Wiley & Sons, Inc.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
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  • 10
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    Unknown
    Prospects for in-process diagnosis of metal cutting by monitoring vibration signals (1987)
    Springer
    Details
    Publication Date: 1987-11-01
    Print ISSN: 0022-2461
    Electronic ISSN: 1573-4803
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Springer
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