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  • Articles  (7)
  • 1995-1999  (7)
  • Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics  (7)
  • 1
    Electronic Resource
    Electronic Resource
    BISTABLE CHOLESTERIC REFLECTIVE DISPLAYS:Materials and Drive Schemes (1997)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Materials Research 27 (1997), S. 117-146 
    Details
    ISSN: 0084-6600
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Cholesteric liquid crystals possess a helical structure and exhibit two stable states at zero field: the planar texture and the focal conic texture. In the planar texture, they reflect circularly polarized light, whereas in the focal conic texture, they scatter light in forward directions. They can be switched from the planar texture to the focal conic texture by a low-voltage pulse and switched from the focal conic texture to the planar texture by a high-voltage pulse. The wavelength of the reflected light is easily adjusted by varying the pitch of cholesteric liquid crystals. They can be used to make reflective displays that do not need a back light and have a good readability under room-light conditions. We first review the optical properties of bistable cholesteric reflective displays and discuss the techniques used to achieve high contrast and large viewing angle. We then discuss the transitions among the cholesteric textures and the drive schemes used to address bistable cholesteric reflective displays.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.matsci.27.1.117
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  • 2
    Electronic Resource
    Electronic Resource
    The effect of ultra-high molecular weight polyethylene fiber on the mechanical properties of acrylic bone cement (1997)
    Springer
    Journal of polymer research 4 (1997), S. 41-46 
    Details
    ISSN: 1572-8935
    Keywords: Acrylic bone cement ; Ultra-high molecular weight polyethylene fiber ; Mechanical properties ; Dynamic mechanical analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The effects of the addition of ultra-high molecular weight polyethylene fiber (UHMWPE) on the mechanical properties of standard surgical Simplex-P radiopaque bone cement have been investigated. It was found that the tensile strength and tensile modulus were apparently not improved by the incorporation of UHMWPE in the acrylic bone cement. The results of bending strength and bending modulus indicated that a reinforcing effect is obtained at UHMWPE contents as low as 1 wt%, and then levelled off with increasing UHMWPE contents. When the UHMWPE contents as low as 2 wt%, the values of compressive strength and modulus seemed approximate the same; whereas the values of compressive strength and modulus decreased with increasing UHMWPE contents. From the results of dynamic mechanical analysis (DMA), the values of dynamic storage modulus of bone cement increased at UHMWPE fiber as low as 2 wt%, but beyond that UHMWPE content the value of the dynamic storage modulus decreased with increasing UHMWPE contents. The same results were also found for the dynamic loss modulus. When methyl methacrylate was grafted onto UHMWPE by plasma and UV irradiation treatment, it was found that by adding the treated UHMWPE fiber in acrylic bone cement had a significant reinforcing effect on the mechanical properties of bone cement.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s10965-006-0006-2
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  • 3
    Electronic Resource
    Electronic Resource
    Influence of activation time on the properties of polyacrylonitrile-based activated carbon hollow fiber (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 58 (1995), S. 185-189 
    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: Activated carbon hollow fiber (ACHF) was prepared from polyacrylonitrile (PAN) hollow fiber through carbonization in nitrogen and activation with carbon dioxide. The effect of the activation time on the pore size distribution and the surface structure of the resulted ACHF was investigated. The results show that increasing the activation time at 800°C can increase the number of pores and reduce the crystal size, the tensile strength, the modulus, and the elongation. © 1995 John Wiley & Sons, Inc.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1995.070580121
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  • 4
    Electronic Resource
    Electronic Resource
    Catalytic oxidation of sulfur dioxide on polyacrylonitrile-based active hollow carbon fiber (1996)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 62 (1996), S. 2287-2293 
    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: The catalytic oxidation of SO2 on polyacrylonitrile-based active hollow carbon fiber (AHCF) was investigated. A single-pass reacting system was developed to study this reaction. The sulfur dioxide contained in the gas stream was oxidized to sulfuric acid in the presence of oxygen and water. Four types of active hollow carbon fibers were prepared through various conditions in order to study the influence of the structure of AHCF on the characteristics of the catalytic oxidation. The fiber sample with more mesopores and micropores showed a higher degree of reaction, but the degree of reaction declined after a period of time, possibly due to the saturation of the active sites by the reaction products. The degree of reaction from the fiber sample with fewer mesopores and micropores did not show the overshoot and reached a steady state after a period of time. © 1996 John Wiley & Sons, Inc.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Influence of precursor structure on the properties of polyacrylonitrile-based activated carbon hollow fiber (1996)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 59 (1996), S. 1725-1731 
    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: Three types of precursors of polyacrylonitrile (PAN) hollow fibers were used to produce activated carbon hollow fibers (ACHF). These precursors are different in the structure and composition. Characterization were performed including tensile strength, modulus, x-ray diffraction, pore size distribution, and surface area measurement for the resulting ACHF. The results show that the ACHF produced from the precursor with larger crystal size and dense structure has higher mechanical properties, whereas the ACHF from the precursor with smaller crystal size and porous structure has larger surface area and broader pore size distribution. © 1996 John Wiley & Sons, Inc.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 6
    facet.materialart.
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    Development of an intelligent tool system for flexible L-bending process of metal sheets (1998)
    Institute of Physics
    Details
    Publication Date: 1998-08-01
    Print ISSN: 0964-1726
    Electronic ISSN: 1361-665X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Institute of Physics
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  • 7
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    BISTABLE CHOLESTERIC REFLECTIVE DISPLAYS:Materials and Drive Schemes (1997)
    Annual Reviews
    Details
    Publication Date: 1997-08-01
    Print ISSN: 0084-6600
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Annual Reviews
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