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  • Books
  • Articles  (2)
  • PACS: 79.20.D; 78.47; 77.84.L  (1)
  • Polycarbonate  (1)
  • Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics  (2)
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  • Books
  • Articles  (2)
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Keywords
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Topic
  • Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics  (2)
  • Physics  (1)
  • Chemistry and Pharmacology  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Femtosecond- and nanosecond-pulse laser ablation of bariumalumoborosilicate glass (1999)
    Springer
    Applied physics 69 (1999), S. S763 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 79.20.D; 78.47; 77.84.L
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. Laser ablation with femtosecond pulses (130 fs, wavelength 800 nm, repetition rate 2 Hz) was compared with nanosecond-pulse ablation (10 ns, wavelength 266 nm, repetition rate 2.5 Hz) of bariumalumoborosilicate glass in air using the direct focusing technique. Different ablation thresholds and heat-affected zones were observed. The lateral and vertical machining precision was evaluated. Single nanosecond laser pulses in the far UV resulted in a bubble or a circular hole in the centre of the illuminated spot, depending on the applied fluence. The ablation behaviour in the case of near-IR femtosecond pulses contrasted to this. Bubble formation was not detected. It needed repeated pulses at the same spot to modify the surface until material removal could be observed (incubation). Cavity dimensions of less than the beam diameter were achieved in this case.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390051524
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Structure and anisotropy in polycarbonate III. Study of elastic and optical properties of oriented samples with the method of high resolution Brillouin spectroscopy (1987)
    Springer
    Colloid & polymer science 265 (1987), S. 761-773 
    Details
    ISSN: 1435-1536
    Keywords: Polycarbonate ; oriented polymers ; elastic and optical anisotropy ; Brillouin spectroscopy ; aggregate model ; orientation parameters
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract High resolution Brillouin spectroscopy (BS) has been used to investigate elastic and optical properties of uniaxially drawn samples of polycarbonate (PC). The results are discussed in the framework of the single phase aggregate model (SPAM) of Ward. According to a recently developed evaluation technique, the SPAM parameters of PC are determined, resulting in the following elastic constants of the structural units:c 33 0 =33 GPa,c 11 0 =7 GPa,c 13 0 =9.7 GPa,c 44 0 =1.4 GPa, andc 66 0 =1 GPa. A nearly quadratic dependence of the orientation parameterP 4 onP 3 results, which can be explained by a modified pseudoaffine deformation scheme.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01418451
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    Paper (German National Licenses)
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