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  • 1
    Electronic Resource
    Electronic Resource
    Low threshold 1.3-μm InGaAsP/InP lasers prepared by a single-step liquid-phase epitaxy (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 2151-2153 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A novel approach to form low threshold laser structures, similar to existing mass-transported lasers but without the second regrowth step, is described. The laser has comparable performance in threshold current and quantum efficiency to more conventional buried heterostructure lasers made with a two-step process. Because of the simplicity in fabrication and its reduced parasitic capacitance it has the potential to be low cost and to have high modulation bandwidth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.341177
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  • 2
    Electronic Resource
    Electronic Resource
    High-power diode-laser-pumped midwave infrared HgCdTe/CdZnTe quantum-well lasers (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 65 (1994), S. 810-812 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Diode-array-pumped HgCdTe/CdZnTe broad-stripe quantum-well lasers operated at 88 K yielded 1.3 W peak power and 10 mW average power per facet at 3.2 μm. The highest operation temperature was 154 K, and the characteristic temperature of the threshold was 16 K. The external quantum efficiency was ∼7.5% at ∼80 K and decreased by an order of magnitude at 150 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.112239
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  • 3
    Electronic Resource
    Electronic Resource
    Hydrolysable tannins from Loropetalum chinense
    Amsterdam : Elsevier
    Phytochemistry 32 (1993), S. 1287-1292 
    Details
    ISSN: 0031-9422
    Keywords: Hamamelidaceae ; Loropetalum chinense ; camelliin B. ; ellagitannin ; loropetalins A-C ; tannin
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0031-9422(00)95107-0
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  • 4
    Electronic Resource
    Electronic Resource
    Cross-correlation analysis of the large-scale distribution of galaxies with different luminosities
    Amsterdam : Elsevier
    Chinese Astronomy and Astrophysics 14 (1990), S. 241-247 
    Details
    ISSN: 0275-1062
    Keywords: Galaxy-large scale structure-cosmology
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0275-1062(90)90048-I
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  • 5
    Electronic Resource
    Electronic Resource
    New rotational bands in 174Ta (1998)
    Springer
    The European physical journal 3 (1998), S. 21-23 
    Details
    ISSN: 1434-601X
    Keywords: PACS:23.20.Lv Gamma transitions and level energies – 21.10.Hw Spin, parity, and isobaric spin – 27.70.+q 150 ≤ A ≤ 189
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: Three new bands in 174Ta have been identified by using the 160Gd(19F,5n) reaction at beam energies of 87 MeV and 96 MeV. Nilsson configurations are assigned to these bands. In the 9/2−[514]p+5/2−[512]n band, the AB neutron crossing occurs at a rotational frequency of 0.30 MeV. This is indicative of the disappearance of the evidence for a reduction in neutron pair correlations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100500050145
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  • 6
    Electronic Resource
    Electronic Resource
    Global motion of a dissipative asymmetric gyrostat (1992)
    Springer
    Archive of applied mechanics 62 (1992), S. 329-337 
    Details
    ISSN: 1432-0681
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Übersicht Das Verhalten eines asymmetrischen Kreisels mit innerer oder äußerer Reibung wird qualitativ untersucht. Die Stellung des Kreisels wird durch zwei Kardanwinkel zwischen körperfesten und raumfesten Koordinatensystemen beschrieben. Die sich ergebenden Bewegungsgleichungen gelten für autonome Systeme, deren Singularitäten permanente Drehungen des Kreisels darstellen. Das Globalverhalten des Kreisels ist durch die Anzahl dieser Singularitäten und ihrer Verteilung gegeben. Die Art einer jeden Singularität ändert sich mit der Masseverteilung und der Rotorgeschwindigkeit, und es treten Verzweigungen auf.
    Notes: Summary The motion of an asymmetrical gyrostat with external or internal energy dissipation is discussed by use of the qualitative method. The attitude motion of the gyrostat is described by two angular coordinates of the total angular momentum H relative to a body-fixed reference frame. The dynamical equation is written for an autonomous system whose singularity corresponds to the permanent rotation of the gyrostat. The global motion of the gyrostat is determined by the number and distribution of singularities. The type of each singularity varies with the variation of mass geometry and rotor speed, and a bifurcation phenomenon can be observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00788640
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  • 7
    Electronic Resource
    Electronic Resource
    Global dynamical behavior of a three-body system with flexible connection in the gravitational field (1999)
    Springer
    Archive of applied mechanics 69 (1999), S. 47-54 
    Details
    ISSN: 1432-0681
    Keywords: Key words Bifurcation ; stability ; multibody system dynamics ; singularity theory ; Liapunov's direct method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary In this paper, the global behavior of relative equilibrium states of a three-body satellite with flexible connection under the action of the gravitational torque is studied. With geometric method, the conditions of existence of nontrivial solutions to the relative equilibrium equations are determined. By using reduction method and singularity theory, the conditions of occurrence of bifurcation from trivial solutions are derived, which agree with the existence conditions of nontrivial solutions, and the bifurcation is proved to be pitchfork-bifurcation. The Liapunov stability of each equilibrium state is considered, and a stability diagram in terms of system parameters is presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004190050203
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  • 8
    Electronic Resource
    Electronic Resource
    The stability of a fluid-filled top rotating on a horizontal plane (1992)
    Springer
    Archive of applied mechanics 62 (1992), S. 487-494 
    Details
    ISSN: 1432-0681
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Übersich Für einen flüssigkeitsgefüllten Kreisel auf einer rauhen, horizontalen Unterlage wird die Stabilität um die Hochachse erörtert und ein Stabilitätskriterium in analytischer Form gewonnen. Mit Hilfe von Ljapunovs direkter Methode wird eine hinreichende Stabilitätsbedingung für eine flüssigkeitsgefüllte Chaplyginsche Kugel bewiesen und eine befriedigende Erklärung zu Kelvins Frage über den Einfluß von Schwerkraft und Gleitreibung gegeben. Der Lagrangesche Kreisel wird als Sonderfall mit glatter Unterlage behandelt.
    Notes: Summary The stability of a fluid-filled top rotating on a rough horizontal plane about the erect axis is discussed and a stability criterion in analytical form is obtained. A sufficient condition of stability for a fluid-filled Chaplygin sphere is proved by using Lyapunov's direct method, and a more satisfactory explanation to Kelvin's question considering the influence of gravity and sliding friction is given. The fluid-filled Lagrange gyro is discussed as a special case when the plane is absolutely smooth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00810239
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  • 9
    Electronic Resource
    Electronic Resource
    The stability of the permanent rotation of a free multibody system (1989)
    Springer
    Acta mechanica 79 (1989), S. 43-51 
    Details
    ISSN: 1619-6937
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The stability problem of the permanent rotation of a torque-free multibody system with spherical joints is discussed by use of Liapunov's direct method. The system is described by the Hooker-Margulies equations in vector-dyadic form, and there exist the integrals of angular momentum and of energy for the torque-free case. The first integrals obtained are used to establish the Liapunov function, then a stability criterion in analytical form is found for the system composed of two symmetrical bodies coupled by a frictionless joint. It is proven that the permanent rotation of such a system about the coincident axis of symmetry is always stable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01181479
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  • 10
    Electronic Resource
    Electronic Resource
    Chaotic motion of an asymmetric gyrostat in the magnetic field of the earth (2000)
    Springer
    Acta mechanica 141 (2000), S. 125-134 
    Details
    ISSN: 1619-6937
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The attitude motion of an asymmetric magnetic gyrostat satellite in a circular orbit subjected to both gravitational and magnetic forces of the earth is investigated by using the version of Melnikov's method developed for a two-degree of freedom Hamiltonian system withS 1 symmetry. For this purpose Deptrit's canonical variables are introduced to establish the Hamiltonian structure for this problem. It is found that the motion is chaotic in the sense of Smale's horseshoe under certain conditions. The effects of the magnetic moment of the gyrostat and the speed of the rotor in the gyrostat on the global motion are also studied by numerical computation. It is shown that as the magnetic moment of the gyrostat increases, the chaotic area in the Poincaré map will enlarge; as the rotor speed increases, a chaotic motion will turn into a regular motion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01268672
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