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  • 1
    Digitale Medien
    Digitale Medien
    Springer
    Cellular and molecular life sciences 30 (1974), S. 1438-1440 
    ISSN: 1420-9071
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Zusammenfassung Aus «Euphorbium», dem luftgetrockneten Latex vonEuphorbia resinifera Berg, wurden 2 neue Ester des tri- und makrozyklischen, polyfunktionellen Diterpens Ingol, 2 neue und ein bereits bekannter Ester des tetrazyklischen polyfunktionellen Diterpens 12-Desoxy-phorbol sowie ein Gemisch von neuen Estern des tetrazyklischen polyfunktionellen Diterpens Ingenol isoliert. Das Gemisch der Ingenolester enthält langkettige, methylverzweigte Fettsäuren. Alle isolierten Ester wurden auf irritierende Wirkung am Mäuseohr und auf cocarcinogene Wirkung an der Rückenhaut der Maus geprüft.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    ISSN: 1572-817X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract An optical output power of 160 mW has been successfully achieved in 1.625-μm strained multiple-quantum-well lasers at a forward current of 800 mA under pulsed operation. Such a high output power has been achieved by optimizing the separated confinement heterostructure layer thickness. The operating life of high-power 1.625-μm lasers has been estimated from the results of accelerated ageing at an ambient temperature of 45°C and 500 mA under continuous-wave operation. No significant change in the optical output power was observed up to 2000 hours. The mean time to failure is estimated to be about 4.5×104 hours at 500 mA and 45°C.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Springer
    Archive of applied mechanics 65 (1995), S. 457-464 
    ISSN: 1432-0681
    Schlagwort(e): Key words nonlinear structure ; Gaussian excitation ; polynomial approximation ; stationary probability
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Summary  A new technique is proposed to obtain an approximate probability density for the response of a general nonlinear system under Gaussian white noise excitations. In this new technique, the original nonlinear system is replaced by another equivalent nonlinear system, structured by the polynomial formula, for which the exact solution of stationary probability density function is obtainable. Since the equivalent nonlinear system structured in this paper originates directly from certain classes of real nonlinear mechanical systems, the technique is applied to some very challenging nonlinear systems in order to show its power and efficiency. The calculated results show that applying the technique presented here can yield exact stationary solutions for the nonlinear oscillators. This is obtained by using an energy-dependent system, and for a nonlinearity of a more complex type. A more accurate approximate solution is then available, and is compared with the approximation. Application of the technique is illustrated by examples.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Springer
    Archive of applied mechanics 66 (1996), S. 343-356 
    ISSN: 1432-0681
    Schlagwort(e): Key words multifrequency excitations ; strong damping ; off-resonance vibration ; resonance ; Duffing equations
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Summary  In this paper, a new asymptotic calculation method is presented for a class of nonlinear nonautonomous vibration systems with multiple external periodic interferences. Simple calculation formulae of an asymptotic solution for resonance and off-resonance vibration are derived. The paper is concerned with a vibration system representing a class of nonlinear oscillators. Consequently, the calculation of a class of nonlinear oscillators is routinized. Two different Duffing equations are verified which shows that the results are completely in accordance with the solutions of references [3, 4, 6]. The derivation of solutions of Duffing equations becomes easier and simpler. In addition, some errors in reference [6] are pointed out.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    Springer
    Archive of applied mechanics 66 (1996), S. 343-356 
    ISSN: 1432-0681
    Schlagwort(e): multifrequency excitations ; strong damping ; off-resonance vibration ; resonance ; Duffing equations
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Summary In this paper, a new asymptotic calculation method is presented for a class of nonlinear nonautonomous vibration systems with multiple external periodic interferences. Simple calculation formulae of an asymptotic solution for resonance and off-resonance vibration are derived. The paper is concerned with a vibration system representing a class of nonlinear oscillators. Consequently, the calculation of a class of nonlinear oscillators is routinized. Two different Duffing equations are verified which shows that the results are completely in accordance with the solutions of references [3, 4, 6]. The derivation of solutions of Duffing equations becomes easier and simpler. In addition, some errors in reference [6] are pointed out.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 6
    Digitale Medien
    Digitale Medien
    Springer
    Archive of applied mechanics 66 (1996), S. 255-263 
    ISSN: 1432-0681
    Schlagwort(e): external stochastic excitation ; nonlinear dynamic systems ; stationary random process ; exact probability densities ; FPK equation
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Summary Exact stationary solutions are constructed for nonlinear dynamic systems subjected to stochastic excitation. The results are then applied to both classical and nonclassical stochastic vibration systems.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 7
    Digitale Medien
    Digitale Medien
    Springer
    Archive of applied mechanics 66 (1996), S. 255-263 
    ISSN: 1432-0681
    Schlagwort(e): Key words external stochastic excitation ; nonlinear dynamic systems ; stationary random process ; exact probability densities ; FPK equation
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Summary  Exact stationary solutions are constructed for nonlinear dynamic systems subjected to stochastic excitation. The results are then applied to both classical and nonclassical stochastic vibration systems.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 8
    Digitale Medien
    Digitale Medien
    Springer
    Archive of applied mechanics 65 (1995), S. 457-464 
    ISSN: 1432-0681
    Schlagwort(e): nonlinear structure ; Gaussian excitation ; polynomial approximation ; stationary probability
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Summary A new technique is proposed to obtain an approximate probability density for the response of a general nonlinear system under Gaussian white noise excitations. In this new technique, the original nonlinear system is replaced by another equivalent nonlinear system, structured by the polynomial formula, for which the exact solution of stationary probability density function is obtainable. Since the equivalent nonlinear system structured in this paper originates directly from certain classes of real nonlinear mechanical systems, the technique is applied to some very challenging nonlinear systems in order to show its power and efficiency. The calculated results show that applying the technique presented here can yield exact stationary solutions for the nonlinear oscillators. This is obtained by using an energy-dependent system, and for a nonlinearity of a more complex type. A more accurate approximate solution is then available, and is compared with the approximation. Application of the technique is illustrated by examples.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 9
    Digitale Medien
    Digitale Medien
    Springer
    International archives of occupational and environmental health 29 (1972), S. 189-200 
    ISSN: 1432-1246
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary A series of exposure experiments with Triethylaluminum were undertaken using animals, and the following results were obtained: 1. Gas Chromatographic analysis of the exposure gas showed that the gas contained various combustion products of TEA in the air and contained an unidentified substance which had a retention time equivalent to a 6-carbon compound. The substance was assumed to be TEA itself. 2. A moderate systemic effect of “TEA” gas on various organs was observed when it contained considerable amounts of the 6-carbon compound. 3. Characteristic changes in the lungs of animals exposed to “TEA” were found by histological examination. The changes in the lungs were a result of moderate irritation. 4. The effects of exposure to the “TEA-toluene” mixture were more severe in the animals than the effects of “TEA”. Those effects would be mainly due to toluene because the same effects could be seen by the exposure to toluene alone. 5. Direct action of “TEA” on the skin was identical to that of a burn. A possible relation between these results and the clinical symptoms found among some of the workers handling TEA was briefly discussed.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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