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  • 1
    Electronic Resource
    Electronic Resource
    Three-Dimensional Curved Profile Extrusion – First Results on the Influence of Gravity (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 10 (Feb. 2006), p. 5-12 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: This paper presents and discusses the latest achievements in the manufacture of threedimensionally curved aluminum profiles using an integrated bar extrusion process. While the conventional process chain lacks applicability and quality especially in low volume production, the new technology is promising, but still needs research to understand the correlation between the product to be manufactured and the contour accuracy to be achieved. This paper shows first resultson the manufacture using a robot-guided second guiding tool and direct air quenching. The results will have an impact on further processing steps
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/39/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.10.5.pdf
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Manufacture of 3D Curved Profiles for Structure Components (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 43 (Apr. 2008), p. 1-8 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Curved Profile Extrusion (CPE) is an extension of the common extrusion process andoffers the possibility to manufacture three-dimensionally curved profiles. Due to the flexibility ofthe process different curvatures can be produced with the same setup, which makes this techniqueefficient especially for low volume production. The process is characterized by a controlled lateraldeflection of the strand which influences the material flow in the die and causes the profilecurvature. In this paper, a direct comparison of the power rating between warm bending and CPE ispresented. Furthermore, the investigations concerning the choice of support strategy of thesurmounting profile by a robot to increase the curvature accuracy are continued. Finally, someextensions of the equipment are explained to increase the level of process integration
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.43.1.pdf
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Recent Developments in the Manufacture of Complex Components by Influencing the Material Flow during Extrusion (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 367 (Feb. 2008), p. 55-62 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: New innovative direct extrusion process variants, curved profile extrusion (CPE), twistedprofile extrusion (TPE), and hollow profile extrusion (HPE), which increase the flexibility ofaluminum profile manufacturing processes, are presented in this paper. These processes arecharacterized by influencing the material flow inside the die so that the forming process iscompleted when exiting the die. On the one hand, three-dimensionally curved profiles are producedand analyzed by CPE regarding the accuracy, the influencing parameters, and the compensationstrategies. On the other hand, TPE and HPE make it possible to manufacture helical profiles usable,for example, as screw rotors in fluid machinery
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.367.55.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Identification and biochemical characterization of the plasma-membrane H+-ATPase in guard cells of Vicia faba L. (1993)
    Springer
    Planta 190 (1993), S. 44-50 
    Details
    ISSN: 1432-2048
    Keywords: Guard cell ; H+-ATPase ; Mesophyll cell ; Patch-clamp ; Plasma membrane ; Proton pump (membrane density)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The plasma-membrane H+-pump in guard cells generates the driving force for the rapid ion fluxes required for stomatal opening. Since our electrophysio-logical studies revealed a two fold higher pump-current density in guard cells than in mesophyll cells of Vicia faba L. we elucidated the biochemical properties of this proton-translocating ATPase in plasma-membrane vesicles isolated from both cell types. The capability of the H+ —ATPase to create an H+ gradient is maintained in plasma-membrane vesicles derived from purified guard cells via blender maceration, high-pressure homogenization and polymer separation. The H+-pumping activity of these vesicles coincides with the presence of two polypeptides of approx. 100 and 92 kDa which are recognized by a monoclonal antibody raised against the plasma-membrane H+-ATPase from Zea mays L. coleoptiles. Comparison of H+-pumping activities of isolated membranes revealed an approximately two fold higher activity in guard cells than in mesophyll cells with respect to the total membrane protein content. Furthermore, we demonstrated by western blotting that the difference in pump activities resulted from a higher abundance of the electroenzyme per unit membrane protein in guard-cell plasma membranes. We suggest that the high H+-pump capacity is necessary to enable guard cells to respond to sudden changes in the environment by a change in stomatal aperture.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00195673
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Green circuits — The potential of plant specific ion channels (1994)
    Springer
    Plant molecular biology 26 (1994), S. 1637-1650 
    Details
    ISSN: 1573-5028
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00016494
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    Paper (German National Licenses)
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  • 6
    Book
    Book
    OpenVPN / (2008)
    Bonn :Galileo Press,
    Details
    Title: OpenVPN /
    Author: Becker, Dirk
    Edition: 1. Aufl.
    Publisher: Bonn :Galileo Press,
    Year of publication: 2008
    Pages: 284 S. : , Ill., graph. Darst.
    Series Statement: Galileo Computing
    ISBN: 978-3-8362-1197-0
    Type of Medium: Book
    Language: German
    URL: lizenzfrei
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