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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Applied physics 47 (1988), S. 187-190 
    ISSN: 1432-0649
    Keywords: 42.55 FN ; 41.80 Dd
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Optimizations of gas composition and input energy were performed for gas mixtures containing a buffer gas and either Ar, Kr or Xe as the lasing gas. The total gas pressure was varied between 1 and 14 bar and the input energy from 0.03 to 0.7 J/cm3. The excitation source was a small coaxial electron beam with a pumping length of 20 cm and a pulse length of 30 ns (FWHM). From an active volume of 13.3 cm3 a maximum output energy of 12 mJ was obtained from a gas mixture containing 0.3% Xe in Ar at a total gas pressure of 10 bar. The intrinsic efficiency was 0.9%.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Applied physics 52 (1991), S. 277-280 
    ISSN: 1432-0649
    Keywords: 42.55 Fn ; 41.80 Dd ; 52.80 Tn
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Experimental investigations on an e-beam sustained near infrared Ar:Xe laser have been carried out to determine the intrinsic efficiency at optimized conditions. A parametric study at different sustainer currents reveals a maximum output energy depending on current density. Up to 8 bar the optimized laser output power per unit volume increases linearly with 1.1MW/1 bar. Intrinsic efficiencies of up to about 8% are feasible.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Applied physics 52 (1991), S. 336-340 
    ISSN: 1432-0649
    Keywords: 34.80 D ; 41.80 Dd ; 42.55 F
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In order to study the kinetic mechanism of the e-beam pumped Ar/Xe laser, the temporal profiles of individual laser lines during multiline oscillation have been measured as a function of power deposition (1–12MW/cm3) and gas laser pressure (2–14 bar) using a short pulse (30 ns) coaxial electron beam as excitation source. It was found that the optimum output energy at each pressure was obtained at the same specific power deposition. Strong line competition has been observed between the 2.65 and 1.73 μm transitions. In order to explain our results we suggest that besides electron collision mixing (ECM) between the 5d and 6p levels of Xe, there is also a redistribution between all 6p levels which strongly favours the lower levels at higher pumping densities.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 18 (1987), S. 313-322 
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Cross-ply Cracking in 0/90/0 CFRP LaminatesCross-ply cracking in carbon fibre reinforced plastics (CFRP) with thermoset as well as thermoplastic matrix systems was investigated on 0/90/0 laminates with varying 90°-ply thickness. Since in an angle ply laminate the 90°-ply fails first, the higher strength of the other plies cannot be taken advantage of. For this reason efforts have to be done to increase the transverse strength (strain) of fibre reinforced plastics. In the first place thus it is necessary to investigate the influence of the different parameters which contribute to the transverse strength. In this work the influence of matrix (fracture strain), fibre/matrix interface, voids and constraining effect of neighbouring plies is investigated. With the aid of two-parameter Weibull distributions of the 90°-ply fracture strain, which describe the phenomenon of multiple cracking in a specimen, it was found that the constraining effect due to neighbouring plies, improved fibre/matrix interface and matrix ductilty increase, whereas voids decrease the transverse fracture strain.
    Notes: Querrißbildung in kohlefaserverstärkten Kunststoffen (CFK) mit sowohl duromerer als auch thermoplastischer Matrix wurde untersucht an 0/90/0 Laminaten mit unterschiedlicher 90°-Schichtdicke. Da die 90°-Schicht in einem Mehrschichtverbund zuerst versagt, kann die höhere Festigkeit der anderen Schichten nicht ausgenutzt werden. Aus diesem Grunde muß nach Möglichkeiten gesucht werden, die Querzugfestigkeit (Festigkeit senkrecht zur Faser) von Faserverbundwerkstoffen zu erhöhen. Zunächst ist es deshalb notwendig, den Einfluß der Parameter, die die Querzugfestigkeit beeinflussen, zu untersuchen. In dieser Arbeit ist der Einfluß der Matrix(-Bruchdehnung), der Faser/Matrix-Grenzschicht, der Lunker und der Stützwirkung von Nachbarschichten ermittelt worden. Mit Hilfe von zweiparametrigen Weibull-Verteilungen der 90° -Schicht-Bruchdehnung, die das Phänomen der mehrfachen Rißbildung in einer Probe beschreiben, wurde festgestellt, daß die Stützwirkung der Nachbarschichten, verbesserte Faser/Matrix-Haftung und Matrixduktilität die Bruchdehnung erhöhen und Lunker die Bruchdehnung verkleinern.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 12 (1981), S. 104-105 
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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