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  • Springer  (91)
  • Taylor & Francis
  • 1985-1989  (52)
  • 1980-1984  (39)
  • 1955-1959  (2)
  • 1940-1944  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    The effects on joint losses of tolerances in some geometrical parameters of optical fibres (1981)
    Springer
    Optical and quantum electronics 13 (1981), S. 11-18 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Among the many possible contributions to joint or splice loss in an optical fibre system are those attributable to the manufacturing tolerances of the fibres themselves. This paper predicts, from a probability approach, the likely effect of errors in the cladding surface diameter, the circularity of this surface and the concentricity of core and cladding. It is shown that, for one representative set of excitation conditions, the tolerances proposed in a draft CCITT recommendation lead to a mean joint loss of 0.043 dB with a standard deviation of 0.045 dB. The loss exceeds 0.33 dB with a probability of 0.001.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00620026
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  • 2
    Electronic Resource
    Electronic Resource
    Complexation with diol host compounds. Part 2. Structures of 1,1,2,2-tetraphenylethane-1,2-diol and its 1∶2 molecular inclusion complex with dimethylsulphoxide (1989)
    Springer
    Journal of chemical crystallography 19 (1989), S. 809-822 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The structures of 1,1,2,2-tetraphenylethane-1,2-diol and its 1∶2 molecular inclusion complex with dmso have been elucidated by X-ray crystallography from single crystal diffraction data. Crystals of the host, compound I, are monoclinic, space groupP21/n, witha=17.669(6) Å,b=6.144(6) Å,c=17.873(6) Å,β=92.67(3)°,z=4. Crystals of the clathrate, compound II, are triclinic,P¯1, witha=9.138(5) Å,b=18.384(6) Å,c=18.496(3) Å,α=61.16(2)°,β=83.22(3)°, γ=88.06(3)°,Z=4. Both structures were solved by direct methods and refined to finalR values of 0.072 and 0.107, respectively. Compound I is partially disordered and its packing is governed by strong intermolecular hydrogen bonds. Compound II is characterized by crossing channels which accommodate the guest dmso molecules. The thermal properties of the latter compound have been characterized by DTA and TGA thermograms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01185348
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  • 3
    Electronic Resource
    Electronic Resource
    Complexation with diol host compounds. Part 3. Molecular inclusion of 4-methylcyclohexanone and 2-methylcyclohexanone by the host,trans-9,10-dihydroxy-9,10-diphenyl-9,10-dihydroanthracene (1989)
    Springer
    Journal of chemical crystallography 19 (1989), S. 847-859 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The structures of the 1∶2 molecular complexes oftrans-9,10-dihydroxy-9,10-diphenyl-9,10-dihydroanthracene with 4-methylcyclohexanone (1) and with 2-methylcyclohexanone (2) have been determined by X-ray crystallography. The crystal data are as follows: Compound (1):P22/c,a=8.838(2) Å,b=8.92(1) Å,c=20.879(8)=Å,β=98.67(2)°,V=1627(2) Å3,Z=2 andR=0.062 for 2201 unique MoKα reflections; Compound (2):P¯1,a=8.917(3) Å,b=9.900(2) Å,c=11.250(4) Å,a=68.72(2)°,β=64.39(3)°, γ=74.86(2)°,V=828.1(5) Å3,Z=1 andR=0.098 for 2563 unique reflections. Both inclusion compounds exhibit O-H⋯O=C hydrogen bonding interactions. The thermal properties of these compounds have been characterized by DTA and TGA thermograms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01185351
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  • 4
    Electronic Resource
    Electronic Resource
    Sustained hysteresis in a catalysed reaction: Hydrogenolysis of alkanes on Re/Al2O3 catalysts (1989)
    Springer
    Catalysis letters 2 (1989), S. 257-261 
    Details
    ISSN: 1572-879X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Alkane hydrogenolysis on Re/Al2O3 catalysts has been studied by a thermal cycling procedure. Because deactivation occurs during heating and is then reversed at higher temperatures, rates are much faster during cooling than during heating. Rates during subsequent thermal cycles are reproducible. Re is 104 times more active than Pt for hydrogenolysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00770222
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  • 5
    Electronic Resource
    Electronic Resource
    Transformations of the perturbed two-body problem to unperturbed harmonic oscillators (1983)
    Springer
    Celestial mechanics and dynamical astronomy 30 (1983), S. 59-69 
    Details
    ISSN: 1572-9478
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Transformations are given which change the perturbed planar problem of two bodies into unperturbed and undamped harmonic oscillators with constant coefficients. The orginally singular, nonlinear and Lyapunov unstable equations become in this way regular, linear, and the stable solution may be written down immediately in terms of the new variables. Transformations of the independent and dependent variables are treated separately as well as jointly. Using arbitrary and special functions for the transformations allows a systematic discussion of previously introduced and new anomalies. For the unperturbed two-body problem the theorem is proved according to which if the transformations are power-functions of the radial variable, then only the eccentric and the true anomalies with the corresponding transformations of the radial variable will result in harmonic oscillators. Important practical applications are to increase autonomous operations in space, since by replacing lengthy numerical integrations by transformations, computer requirements are significantly reduced.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01231102
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  • 6
    Electronic Resource
    Electronic Resource
    Analytical satelite theory in extended phase space (1980)
    Springer
    Celestial mechanics and dynamical astronomy 21 (1980), S. 357-360 
    Details
    ISSN: 1572-9478
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In the present note we show how a simple canonical transformation in extended phase space makes the transition from classical Delaunay elements to the Scheifele variables. We do not use spherical coordinates or Hamilton-Jacobi theory. The meaning of the new variables is briefly explained, especially the use of the true anomaly as one of the variables.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01231274
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  • 7
    Electronic Resource
    Electronic Resource
    A transformation of the two-body problem (1985)
    Springer
    Celestial mechanics and dynamical astronomy 35 (1985), S. 1-7 
    Details
    ISSN: 1572-9478
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A transformation of the differential equations of motion of the two-body problem in the spherical coordinates to oscillator form is derived. It is shown that the independent variable transformation dt/ds=r2 is a transformation which makes the oscillator form possible.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01229108
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  • 8
    Electronic Resource
    Electronic Resource
    Canonical orbital elements in terms of an arbitrary independent variable (1981)
    Springer
    Celestial mechanics and dynamical astronomy 23 (1981), S. 159-172 
    Details
    ISSN: 1572-9478
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Within the framework of the Hamiltonian mechanics in the extended phase space, a set of canonical elements of the Delaunay type is developed in terms of an arbitrary independent angular variable. Application to the four classical anomalies-eccentric, true, elliptic, and mean-is presented. Particular attention is given to the generalized time equation and its conjugate energy equation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01229551
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  • 9
    Electronic Resource
    Electronic Resource
    Error propagation in the numerical solutions of the differential equations of orbital mechanics (1982)
    Springer
    Celestial mechanics and dynamical astronomy 27 (1982), S. 65-77 
    Details
    ISSN: 1572-9478
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The relationship between the eigen values of the linearized differential equations of orbital mechanics and the stability characteristics of numerical methods is presented. It is shown that the Cowell, Encke, and Encke formulation with an independent variable related to the eccentric anomaly all have a real positive eigen value when linearized about the initial conditions. The real positive eigen value causes an amplification of the error of the solution when used in conjunction with a numerical integration method. In contrast an element formulation has zero eigen values and is numerically stable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01228951
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  • 10
    Electronic Resource
    Electronic Resource
    Propagation of local errors in the solutions of the differential equations for orbital elements (1982)
    Springer
    Celestial mechanics and dynamical astronomy 27 (1982), S. 203-210 
    Details
    ISSN: 1572-9478
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The propagation of errors in the solutions of the differential equations for the orbital elements of perturbed two-body motion is investigated. It is shown that the error in the time-element grows linearly for differential equations for orbital elements when only perturbations are present on the right-hand side, cubically for formulations which have a two-body term on the right-hand side, and linearly for formulations based upon extended phase space Hamiltonians.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01271694
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