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  • Springer  (133)
  • 2005-2009  (61)
  • 1985-1989  (48)
  • 1975-1979  (24)
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  • 1
    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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  • 2
    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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  • 3
    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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  • 4
    Electronic Resource
    Electronic Resource
    A block method for the numerical integration of stiff systems of ordinary differential equations (1979)
    Springer
    BIT 19 (1979), S. 429-447 
    Details
    ISSN: 1572-9125
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract A new approach to the approximate numerical integration of stiff systems of first order ordinary differential equations is developed. In this approach several different formulae are applied in a well defined cyclic order to produce highly accurate integration schemes with infinite regions of absolute stability. The efficiency of these new algorithms, compared with that of certain existing ones, is demonstrated for some particular test problems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01931259
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  • 5
    Electronic Resource
    Electronic Resource
    The development of the Poincaré-similar elements with eccentric anomaly as the independent variable (1976)
    Springer
    Celestial mechanics and dynamical astronomy 13 (1976), S. 287-311 
    Details
    ISSN: 1572-9478
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A new set of element differential equations for the perturbed two-body motion is derived. The elements are canonical and are similar to the classical canonical Poincaré elements, which have time as the independent variable. The phase space is extended by introducing the total energy and time as canonically conjugated variables. The new independent variable is, to within an additive constant, the eccentric anomaly. These elements are compared to the Kustaanheimo-Stiefel (KS) element differential equations, which also have the eccentric anomaly as the independent variable. For several numerical examples, the accuracy and stability of the new set are equal to those of the KS solution. This comparable accuracy result can probably be attributed to the fact that both sets have the same time element and very similar energy elements. The new set has only 8 elements, compared to 10 elements for the KS set. Both sets are free from singularities due to vanishing eccentricity and inclination.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01228648
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  • 6
    Electronic Resource
    Electronic Resource
    The development of the Poincaré-similar elements with eccentric anomaly as the independent variable (1976)
    Springer
    Celestial mechanics and dynamical astronomy 14 (1976), S. 333-333 
    Details
    ISSN: 1572-9478
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A new set of element differential equations for the perturbed two-body motions is derived. The elements are canonical and are similar to the classical canonical Poincaré elements, which have time as the independent variable. The phase space is extended by introducing the total energy and time as canonically conjugated variables. The new independent variable is, to within an additive constant, the eccentric anomaly. These elements are compared to the Kustaanheimo-Stiefel (KS) element differential equations, which also have the eccentric anomaly as the independent variable. For several numerical examples, the accuracy and stability of the new set are equal to those of the KS solution. This comparable accuracy result can probably be attributed to the fact that both sets have the same time element and very similar energy elements. The new set has only 8 elements, compared to 10 elements for the KS set. Both sets are free from singularities due to vanishing eccentricity and inclination.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01228518
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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
    Measurement of energy and charged particle emission in the central rapidity region from O+A andp+A collisions at 14.5 GeV/c per nucleon and preliminary results from Si+A collisions (1988)
    Springer
    The European physical journal 38 (1988), S. 35-43 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The first data from a16O beam of total energy 232 GeV at the BNL Tandem-AGS are discussed. Preliminary results from a28Si beam of total energy 406 GeV are also shown. The full complement of E802, including a magnetic spectrometer, was used for the28Si measurement. A different experimental arrangement was used for16O. Comparison measurements with proton beams are presented for both configurations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01574512
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  • 9
    Electronic Resource
    Electronic Resource
    Calcium and sodium distribution and movements in smooth muscle (1985)
    Springer
    Cellular and molecular life sciences 41 (1985), S. 981-988 
    Details
    ISSN: 1420-9071
    Keywords: Ca, Mg, Na ; electron probe analysis ; mitochondria ; sarcoplasmic reticulum ; inositol trisphosphate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Electron probe microanalysis (EPMA) has been used to study the subcellular distribution of Ca, Na, K. Cl, and Mg in smooth muscle. The EPMA results indicate that the sarcoplasmic reticulum (SR) is the majorintracellular source and sink of activator Ca: norepinephrine decreases the Ca content of the junctional SR in portal vein smooth muscle. Mitochondria do not play a significant role in regulating cytoplasmic free Ca2+, but mitochondrial Ca content can be altered to a degree compatible with suggestions that fluctuations in matrix Ca contribute to the control of mitochondrial metabolism. The rise intotal cytoplasmic Ca during a maintained, maximal contraction is very much greater than the rise in free Ca2+, and is probably in excess of the known binding sites available on calmodulin and myosin. Cell Ca is not increased in normal cells that are Na-loaded. The non-Donnan distribution of Cl is not due to compartmentalization, but reflects high cytoplasmic Cl. Na-loading of smooth muscle in K-free solutions is temperature dependent, and may exhibit cellular heterogeneity undetected by conventional techniques. The total cell Mg is equivalent to approximately 12 mM, and less than 50% of it can be accounted for by binding to ATP and to actin. Mitochondrial monovalent cations in smooth muscle are relatively rapidly exchangeable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01952118
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  • 10
    Electronic Resource
    Electronic Resource
    The effect of carbonaceous deposits on product selectivity in alkane hydrogenolysis (1989)
    Springer
    Catalysis letters 3 (1989), S. 359-363 
    Details
    ISSN: 1572-879X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The hydrogenolysis of propane and of n-butane on Pt/Al2O3 and Pt-Re/Al2O3 catalysts has been studied using a stepwise temperature programme which reveals clearly the effects of carbonaceous deposits on both rate and product selectivities. On Pt/Al2O3 catalysts, deposits formed during the reaction of n-butane suppress C2H6 formation and enhance C3H8 formation, due solely to a decrease in the probability of central C-C bond fission. On Pt-Re/Al2O3, such deposits have little or no effect on product selectivities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00771263
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