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  • 2010-2014  (223)
  • 1975-1979  (43)
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  • 1
    Electronic Resource
    Electronic Resource
    Mechanism and Kinetics of Selected Hydrogen Transfer Reactions Typical of Coal Liquefaction (1979)
    s.l. : American Chemical Society
    Industrial and engineering chemistry 18 (1979), S. 153-162 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/i160070a011
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  • 2
    Electronic Resource
    Electronic Resource
    Isomerization and Adduction of Hydrogen Donor Solvents under Conditions of Coal Liquefaction (1979)
    s.l. : American Chemical Society
    Industrial and engineering chemistry 18 (1979), S. 368-376 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/i160072a014
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  • 3
    Electronic Resource
    Electronic Resource
    The influence of satellite flexibility on orbital motion (1978)
    Springer
    Celestial mechanics and dynamical astronomy 17 (1978), S. 145-165 
    Details
    ISSN: 1572-9478
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The orbital perturbations induced by the librational motion and flexural oscillations are studied for satellites having large flexible appendages. Using a Lagrangian procedure, the equations for coupled motion are derived for a satellite having an arbitrary number of appendages in the nominal orbital plane and two flexible members normal to it. The formulation enables one to study the influence of flexibility on both the orbital and attitude motions. The orbital coordinates are expanded as perturbation series in ε=(l/a 0)2,l anda 0 being a characteristic length of the satellite and unperturbed semi-major axis of the orbit, respectively. The first order perturbation equations are solved in terms of elastic deformations and librational angles using the WKBJ method in conjunction with the variation of parameter technique. Existence of secular perturbations is noted for certain librational flexural motions. Three specific examples, Alouette II, Radio Astronomy Explorer and Tethered Orbiting Interferometer, are considered subsequently and their possible secular drifts estimated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01371327
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  • 4
    Electronic Resource
    Electronic Resource
    Long-term evaluation of three-dimensional heliocentric solar sail trajectories with arbitrary fixed sail setting (1979)
    Springer
    Celestial mechanics and dynamical astronomy 19 (1979), S. 113-138 
    Details
    ISSN: 1572-9478
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The solar radiation effects upon the orbital behaviour of an arbitrarily shaped spacecraft (or a solar sail in particular) in a general fixed orientation with respect to the local coordinate frame are investigated. Through introduction of a quasi-angle in the osculating plane, the motion of the orbital plane becomes uncoupled from the in-plane perturbations. Exact solutions in the form of conic sections and logarithmic spirals can readily be formulated for certain specific initial conditions. An effective out-of-plane spiral transfer trajectory is obtained by reversing the force component normal to the orbital plane at specified positions in the orbit. By choosing the appropriate control angles for the sail orientation, any point in space can be reached eventually. In the case of general initial conditions, the long-term orbital behaviour is assessed asymptotically by means of the two-variable expansion procedure. An implicit expression for the eccentricity is derived and explicit results are established by an iteration scheme. The other orbital elements can be expressed in terms of the eccentricity and their asymptotic series for near-circular initial orbits are also obtained. While equations for the higher-order contributions as well as the periodic parts of their solutions can be formulated readily, their secular terms are determined only for a circular initial orbit.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01796085
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  • 5
    Electronic Resource
    Electronic Resource
    Asymptotic solutions in the many-body problem (1976)
    Springer
    Celestial mechanics and dynamical astronomy 14 (1976), S. 465-492 
    Details
    ISSN: 1572-9478
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A three-body problem is considered in which two masses, forming a close binary, orbit a comparatively distant mass. An asymptotic solution of this problem is presented, where the small parameter ε is related to the distance separating the binary and the remaining mass. Accepting certain model constraints, this solution is accurate within a constant errorO(ε11) and uniformly valid for time intervalsO(ε−3). Two specific examples are chosen to verify the literal solution: one relating to the Sun-Earth-Moon configuration of the solar system, the other to an idealized stellar system where the three masses are in the ratio 20:1:1. In both cases close agreement is found when the analytical solution is compared with an equivalent numerically-generated orbit.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01229058
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  • 6
    Electronic Resource
    Electronic Resource
    On the periodic solutions and resonance of spinning satellites in near-circular orbits (1975)
    Springer
    Celestial mechanics and dynamical astronomy 11 (1975), S. 195-212 
    Details
    ISSN: 1572-9478
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Attitude motion of spinning axisymmetric satellites in presence of gravity-gradient and solar radiation pressure torques is studied analytically. The approximate closed-form solution developed for the nonlinear, nonautonomous, coupled fourth-order system proves to be an excellent tool in locating periodic solutions of the system in both circular and noncircular orbits. The variational stability of the periodic motion is examined using the Floquet theory. The resonance analysis suggests the existence of critical combinations of system parameters leading to large amplitude oscillations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01230545
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  • 7
    Electronic Resource
    Electronic Resource
    Asymptotic solutions in the many-body problem (1977)
    Springer
    Celestial mechanics and dynamical astronomy 15 (1977), S. 5-20 
    Details
    ISSN: 1572-9478
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A small particle moves in the vicinity of two masses, forming a close binary, in orbit about a distant mass. Unique, uniformly valid solutions of this four-body problem are found for motion near both equilateral triangle points of the binary system in terms of a small parameter ε, where the primaries move in accordance with a uniformly-valid three-body solution. Accuracy is maintained within a constant errorO(ε8), and the solutions are uniformly valid as ε tends to zero for time intervalsO(ε−3). Orbital position errors nearL 4 andL 5 of the Earth-Moon system are found to be less than 5% when numerically-generated periodic solutions are used as a standard of comparison.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01229044
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  • 8
    Electronic Resource
    Electronic Resource
    Assimilation of ammonia and growth of biotin deficientAspergillus nidulans (1976)
    Springer
    Cellular and molecular life sciences 32 (1976), S. 423-424 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Biotin deficiency inAspergillus nidulans has been found to increase the uptake of ammonium ions, associated with a marked increase in the activity of NADP-linked glutamate dehydrogenase, which is found to be the major route of ammonia assimilation in this culture. The results obtained are discussed with respect to the growth ofAspergillus nidulans during biotin deficiency.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01920773
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  • 9
    Electronic Resource
    Electronic Resource
    Regulation of ammonia uptake inAspergillus nidulans (1977)
    Springer
    Cellular and molecular life sciences 33 (1977), S. 1592-1593 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The ammonia uptake inA. nidulans was found to be linear for about 20 min, and was proportional up to 1.5 mg/ml dry cell density. The transport of ammonia does not involve energy. Normal and biotin deficientA. nidulans showed an identical Km-values of 10.26×10−5 M ammonia for uptake. The uptake of ammonium ion has been shown to be regulated by the intracellular concentration of ammonia.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01934016
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  • 10
    Electronic Resource
    Electronic Resource
    Regulation of glucose transport in Aspergillus nidulans (1977)
    Springer
    Cellular and molecular life sciences 33 (1977), S. 726-727 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Pyruvate and acetate inhibited the uptake of glucose by Aspergillus nidulans; although there were significant variations in glucose uptake rate, the intracellular concentration of acetate was almost identical in biotin-supplemented, normal and deficient cells. The in vitro activity of glucose-binding protein was not affected by biotin, avidin, acetate or acetyl-CoA.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01944152
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