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  • Springer  (189)
  • 2000-2004  (72)
  • 1990-1994  (117)
  • 1935-1939
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  • 1
    Electronic Resource
    Electronic Resource
    Crystal structure of N-(4-nitrophenyl)-N-phenylsulfonamide (1993)
    Springer
    Journal of chemical crystallography 23 (1993), S. 513-517 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The crystal structure of N-(4-nitrophenyl)-N-phenylsulfonamide (C18H14N2O4S), a derivative of sulfonamide, has been determined by X-ray diffraction method using CuKα radiation. The compound crystallizes in the monoclinic space groupP21/n, witha=24.463(1),b=5.745(2),c=11.428(3)Å andβ=94.39(2)°. The structure was solved by direct methods and refined by full-matrix least squares to a finalR value of 0.045 with 3032 unique reflections. The dihedral angle between the substituents phenyl ring B and the phenyl A is 94.7(3)°. The S atom is in the usual distorted tetrahedral configuration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01182529
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  • 2
    Electronic Resource
    Electronic Resource
    Quantum Gravity Equation In Schrödinger Form In Minisuperspace Description (2000)
    Springer
    General relativity and gravitation 32 (2000), S. 2167-2187 
    Details
    ISSN: 1572-9532
    Keywords: quantum Cosmology ; Quantum Gravity ; Time ; Minisuperspace ; Wavefunction of the Universe PACS No. - 04.60, 98.80 Hw
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We start from the classical Hamiltonian constraint of general relativity to obtain the Einstein–Hamiltonian–Jacobi equation. We obtain a time parameter prescription demanding that geometry itself determines the time, not the matter field, such that the time so defined being equivalent to the time that enters into the Schrödinger equation. Using a semiclassical approximation we obtain an equation for quantum gravity in Schrödinger form containing time. We restrict ourselves to a minisuperspace description. Unlike matter field equation our equation is equivalent to the Wheeler–DeWitt equation in the sense that our solutions reproduce also the wavefunction of the Wheeler–DeWitt equation provided one evaluates the normalization constant according to the wormhole dominance proposal recently proposed by us.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1001902620253
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  • 3
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    Quantum Gravity Equation In Schrödinger Form In Minisuperspace Description (2000)
    Springer
    Details
    Publication Date: 2000-11-01
    Print ISSN: 0001-7701
    Electronic ISSN: 1572-9532
    Topics: Physics
    Published by Springer
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    PAPER CURRENT
  • 4
    Electronic Resource
    Electronic Resource
    Polymer anchored metal complexes (1991)
    Springer
    Polymer bulletin 26 (1991), S. 151-157 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Thermal stabilities of these polymers are influenced by the nature of the 3d-metal and their initial decomposition temperatures are between 230–290°C in general. The dielectric constant values are essentially independent of the applied frequency and at 104 KHz reveal the trend: $$PMDA\mathop { - DP - }\limits_{(9.2)} Cr\left. {(III)} \right\rangle {\text{ PM}}\mathop {{\text{DA - D}}}\limits_{{\text{(8}}{\text{.7)}}} {\text{P - Fe}}\left. {{\text{(III)}}} \right\rangle {\text{ PM}}\mathop {{\text{DA - D}}}\limits_{{\text{(8}}{\text{.1)}}} {\text{P - Cu}}\left. {{\text{(II)}}} \right\rangle {\text{ P}}\mathop {{\text{MDA}}}\limits_{{\text{(8}}{\text{.0)}}} {\text{ - DP}}$$ Values for dielectric loss (tan δ) for these polymers are low (1–4×10-2 at 10 KHz) and unlike the dielectric constant, are strongly dependent on the applied frequency. The d.c.-conductivities of the polymers are in the range 4.5×10-8 – 4.7×10-10 (ohm-cm)-1 and depend on the metal ions: $$\left. {Fe^{3 + } } \right\rangle \left. {Cr^{3 + } } \right\rangle \left. {Ni^{2 + } } \right\rangle Cu^{2 + } $$
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00297519
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  • 5
    Electronic Resource
    Electronic Resource
    Crystal and molecular structure of a new biguanide metal complex, [Cu(AMNH)2]Cl2 (1993)
    Springer
    Journal of chemical crystallography 23 (1993), S. 509-512 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The crystal structure of C6H16N8O2·CuCl2, a biguanide metal complex, has been determined by X-ray diffraction data using MoKα radiation. The compound crystallizes in the monoclinic space groupP21/a, witha=11.074(4),b=12.061(4),c=5.312(3)Å andβ=102.8(1)°. The structure was solved by direct methods and refined by full-matrix least-squares to a finalR value 0.037 with 1245 unique reflections. The complex molecule is centrosymmetric, with the Cu atom (0.5,0.5,0.5) on a crystallographic center of symmetry. The complex molecule is rhombic planar with a trans configuration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01182528
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  • 6
    Electronic Resource
    Electronic Resource
    Crystal and molecular structure of di(2-methylbenzotriazole) sulfate, (C7N3H9)2SO4 (1994)
    Springer
    Journal of chemical crystallography 24 (1994), S. 383-386 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The structure of di(2-Methylbenzotriazole) sulphate, (C7N3H9)2SO4, has been solved by X-ray diffraction methods. The compound crystallises in triclinic space group P $$\bar 1$$ witha=6.986(1),b=18.914(1),c=6.990(1) Å, α=95.083 (1), β=115.56 (1) and γ=84.93(1)o, respectively.M r=362.36,F(000)=380,Z=2,D m=1.45 mg m−3, finalR=0.060,R w=0.064. The structure was solved by direct methods (SHELXS86) and refined by least-squares methods. Dimers of planar 2-Methylbenzotriazole (MBT) molecules form stacks, one along thea-axis and the other parallel to thec-axis. The SO 4 −2 ions are confined by the two sets of stacks and are responsible for holding them together. The structure is mainly stabilized by the stacking forces. The average interplanar distances in any stack are 3.281 Å, within a dimer, and 3.361 Å, between the dimers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01665890
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  • 7
    Electronic Resource
    Electronic Resource
    Flat Partial Connections on a Three Manifold Equipped with a Codimension One Foliation (2000)
    Springer
    Geometriae dedicata 80 (2000), S. 65-72 
    Details
    ISSN: 1572-9168
    Keywords: three manifold ; flat connection ; foliation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract Given a compact connected oriented three manifold, equipped with a codimension one foliation, such that the Bott connection on the normal bundle is flat, a 2-form on the space parametrizing flat partial connections on it has been constructed. This form is closed. In the special case where the foliated three manifold is a surface bundle over the circle, this 2-form is identified with a certain 2-form on the parameter space for a class of paths in the representation space for the surface group. The 2-form, in question, on the parameter space for paths is constructed from the natural symplectic form on the representation space for a surface group.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005219731791
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  • 8
    Electronic Resource
    Electronic Resource
    Gravitational Field of Domain Walls in Higher Dimension (2000)
    Springer
    Astrophysics and space science 274 (2000), S. 851-858 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In this paper, we study the gravitational field of domain wall in fivedimensional space-time. Exact solutions of Einstein's equations for a scalarfield with a potential V(Ø) are presented, describing thegravitational field of plane symmetric domain walls. The solution showsthat the energy density as well as pressure in the perpendicular directionon both sides of the walls to be reflection symmetric with respect to thewalls.PACS numbers: 98.80 cq, 0450
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1026577521795
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  • 9
    Electronic Resource
    Electronic Resource
    Pre- and post-scission neutron multiplicities in $19F$  + $209Bi$ reaction at 108 MeV (2003)
    Springer
    The European physical journal 16 (2003), S. 43-50 
    Details
    ISSN: 1434-601X
    Keywords: PACS. 25.70.Jj Fusion and fusion-fission reactions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The pre- and post-scission neutron multiplicities have been determined from the fragment-neutron angular-correlation measurements in 19F + 209Bi reaction at bombarding energy of 108 MeV. The average pre-scission neutron multiplicity ( νpre) is significantly larger than that calculated on the basis of the statistical model. The excess in νpre value is used to estimate the dynamical delay in the fusion-fission time scale for the 228U compound system. For a level density parameter a n = A/10 MeV-1 and a n = a f, the fusion-fission dynamical time was established to be 120 ± 10 × 10-21 s. We also observe that νpre is higher for asymmetric mass splits as compared to symmetric mass splits. The enhancement in the νpre for the asymmetric region could be due to strong variations in the fragment mass distribution at different stages in multiple chance fission at medium excitation energies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epja/i2002-10072-2
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  • 10
    Electronic Resource
    Electronic Resource
    Structural features of the La-Sr-Fe-Co-O system (2001)
    Springer
    The European physical journal 21 (2001), S. 521-526 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 75.30.Vn Colossal magnetoresistance – 61.72.-y Defects and impurities in crystals; microstructure – 72.15.Gd Galvanomagnetic and other magnetotransport effects
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: A structural study has been performed on the La0.8Sr0.2FexCo1-xO3 (x = 0.025 to 0.3) system displaying large magnetoresistance (MR) at room temperature. A detailed analysis of the crystal structure and microstructure was done by X-ray diffraction (XRD), transmission and scanning electron microscopy (TEM and SEM). The atomic resolution TEM images and the appearing superreflections in the corresponding SAED patterns revealed that a superstructure is formed due to the presence of iron. The correlation between the ordered microstructure and the observed large MR ratio is discussed. 57Fe Mössbauer spectroscopy was utilized to gain information on the valence state of iron in the sample with x = 0.3. The lattice parameters of Fe- doped La0.8Sr0.2FexCo1-xO3 compounds were found to increase monotonously with increasing Fe content. The valence state of iron was found to be Fe3+.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00011125
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