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  • 1985-1989  (11)
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Material
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Vibrational and translational energy effects in the abstraction and exchange reactions of NH+3 with D2 (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 86 (1987), S. 2818-2826 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We present a study of the abstraction and exchange reactions of NH+3 with D2 yielding NH3D++D and NH2D++HD, respectively. The translational energy of these experiments was fixed at 0.50 eV, while the vibrational energy of the ammonia cations was selected at values between 3.3 and 4.9 eV by a charge exchange technique. The flux distributions for the two distinct reaction products were quite different, indicating different precursors to their formation. The abstraction reaction products were backward scattered in the center-of-mass reference frame, while sharp forward–backward scattering of the exchange products suggested the participation of a transient intermediate living a fraction of a rotational period. The angular distribution for exchange became more symmetric about 90° with decreasing reagent vibrational energy, further supporting the participation of an intermediate complex. The product kinetic energy distributions for both processes broadened with increasing vibrational energy. This observation is consistent with partitioning of the total available energy of the incoming reagents into exchange product degrees of freedom as one would expect for a transient complex. The participation of the vibrational energy in the abstraction process is consistent with vibration–translation energy transfer from the ν2 bending mode of NH+3 to relative translation of the products.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.452083
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Solitons on a cylindrical pinch with Hall effect (1985)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 28 (1985), S. 3044-3049 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In this paper it is shown by an asymptotic method that the solitons which appear on a cylindrical magnetohydrodynamic (MHD) pinch with axial symmetry persist when the Hall current term is included in the governing equations. On the other hand, the results presented here indicate that, under the linear stability criterion for the cylindrical pinch, nonlinear waves that have an amplitude that does not decay with time can occur.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.865145
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The development of a solitary wave in a channel of variable elliptical cross section (1985)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 28 (1985), S. 2352-2356 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In this paper the disintegration of a solitary wave in an elliptical channel is studied when it propagates from one uniform section of the channel into another through a transition section. It is found that for an elliptical channel with constant width, fission of solitons is also possible when the solitary wave moves into a uniform section of larger depth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.865293
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    On a Korteweg–de Vries equation with variable coefficients in cylindrical coordinates (1986)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 29 (1986), S. 1759-1760 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An equation of the Korteweg–de Vries (KdV) type with variable coefficients in cylindrical coordinates for nonlinear wave propagation on water of variable depth is presented. The special case concerning water motion with cylindrical symmetry reduces to an equation of the KdV type obtained from approximate equations for long waves.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.865651
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Photodissociation of mass-selected solvated metal ions: monoaquastrontium(+) (1987)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 91 (1987), S. 6447-6449 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100310a003
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Size-dependent effects in the photodissociation spectra of strontium ammine complexes (Sr+(NH3)n, n = 1-4) (1989)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 93 (1989), S. 4386-4389 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100348a002
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Dynamical evolution of the rotation of Venus (1988)
    Springer
    Earth, moon and planets 43 (1988), S. 275-287 
    Details
    ISSN: 1573-0794
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract By considering the torque of the bodily tides, the effect of the core-mantle viscous coupling and the torque of the atmospheric tides have been obtained by numerical calculation: the evolution of the spin angular velocity Ω♀ and the obliquity β of the Venus are calculated numerically with the step-variable Runge-Kutta method of 7th order; and 7 sets of the probable Cytherean spin evolution have been obtained. It is indicated that the present spin state of Venus is the result of long-term evolution within the reasonable ranges of some disposable parameters. The early spin period is between 7 h to 2 d and the corresponding obliquity is about 90 ° ~ 100 °. The effects of the torques of body and atmospheric tides and the core-mantle viscous coupling of Venus on its spin angular velocity could nearly cancel out each other about a billion years ago. Therefore, Venus could have been captured in a spin-orbit resonant state by the gravitational torque of the Earth on the permanent deformation part of Venus; and this resonant state has lasted up to the present time.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00117100
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    The lunar mean moment of inertia and the size of the Moon's core (1988)
    Springer
    Earth, moon and planets 42 (1988), S. 179-184 
    Details
    ISSN: 1573-0794
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract In this paper the relation between the uncertainty of the Moon's mean moment of inertia δ(I/Ma 2) and that of the core density δπc is discussed with a two-layer model of the Moon - a mantle obeying Roche's law of the density distribution and a homogeneous core (Fe-core or Fe-FeS-core). When the uncertainty of I/Ma 2 is 0.0023 (that is the accuracy in present observation), a core with radius of 450 km will be appropriate to the limitation of δπc about 1 g cm−3. Considering the accuracy obtained in space explorations, and the compressibility and the quasi-homogeneity of the Moon, we suggest that the parameters C 20, β, γ, a, and GM of the Moon should define as primary constants, but C 22 and C/Ma 2 as derived constants. Therefore, the ratio of mass of Moon to that of Earth in the IAU (1976) system of astronomical constants will become a deducible constant.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00054545
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    The dynamical flattenings of Mercury and Venus (1988)
    Springer
    Earth, moon and planets 41 (1988), S. 289-294 
    Details
    ISSN: 1573-0794
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The method which is used to calculate the dynamical flattenings % MathType!MTEF!2!1!+-% feaafeart1ev1aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn% hiov2DGi1BTfMBaeXafv3ySLgzGmvETj2BSbqefm0B1jxALjhiov2D% aebbfv3ySLgzGueE0jxyaibaiiYdd9qrFfea0dXdf9vqai-hEir8Ve% ea0de9qq-hbrpepeea0db9q8as0-LqLs-Jirpepeea0-as0Fb9pgea% 0lrP0xe9Fve9Fve9qapdbaqaaeGacaGaaiaabeqaamaabaabcaGcba% Gaamisaiabg2da9iaacIcacaWGdbGaeyOeI0YaaSaaaeaacaaIXaaa% baGaaGOmaaaacaGGOaGaamyqaiabgUcaRiaadkeacaGGPaGaaiykai% aac+cacaWGdbaaaa!4717!\[H = (C - \frac{1}{2}(A + B))/C\] of the Earth and Moon meets with difficulties when it applies to Mercury and Venus. In this paper, after the calculation of the dimensionless moment of inertiaC/MR 2 by solving the Emden equation, the effectiveness of the method deriving dynamical flattening from the observed value of the Mercury's obliquity θ is analysed based on the resonance rotation theory. Some suggestions are made for the future space explorations. Finally, the ranges of dynamical flattening and of the obliquity of Venus are calculated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00113990
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    A model equation for steady surface waves over a bump (1989)
    Springer
    Journal of engineering mathematics 23 (1989), S. 315-323 
    Details
    ISSN: 1573-2703
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Technology
    Notes: Abstract The objective of this paper is to study the solutions of a model equation for steady surface waves on an ideal fluid over a semicircular or semielliptical bump. For upstream Froude number F〉1, we show that the numerical solution of the equation has two branches and there is a cut-off value of F below which no solution exists. For F〈1, the problem is reformulated to overcome the so-called infinite-mass dilemma. A branch of solutions and a cut-off value of F, above which no solution exists, are found. Furthermore, we also obtain a branch of hydraulic-fall solutions which decrease monotonically from upstream to downstream.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00128905
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    Paper (German National Licenses)
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