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  • Springer  (39)
  • American Society of Hematology  (1)
  • Molecular Diversity Preservation International
  • PANGAEA
  • 1995-1999  (40)
  • 1996  (40)
  • 1
    Digitale Medien
    Digitale Medien
    Applications of maximum entropy method in capillary viscometry (1996)
    Springer
    Rheologica acta 35 (1996), S. 76-82 
    Details
    ISSN: 1435-1528
    Schlagwort(e): Viscosity measurement ; capillary viscometer ; maximum entropy method ; Weissenberg-Rabinowitsch-Mooney equation
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: Abstract Maximum entropy method (MEM) is presented as a technique for processing data obtained from capillary viscometers. The performance of MEM is assessed by comparing the viscosity versus shear rate curves generated by MEM against that obtained by the standard method based on the “Weissenberg-Rabinowitsch-Mooney equation”. In all the cases in vestigated, MEM proved to be a reliable technique in coping with the experimental noise in the capillary data.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00366555
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  • 2
    Digitale Medien
    Digitale Medien
    Crystal structure and vibrational spectra of polyamine-copper(II) complexes (1996)
    Springer
    Journal of chemical crystallography 26 (1996), S. 15-22 
    Details
    ISSN: 1572-8854
    Schlagwort(e): X-ray diffraction ; infrared spectrometry ; polyamine-copper(II) complexes
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie , Physik
    Notizen: Abstract The structures of [Cu(en)(H2O)2]SO4 (I), [Cu(en)2](NO3)2 (II) and [Cu(trien)I]I (III) have been determined by single crystal X-ray diffraction. ComplexI is monoclinic, space group C2/c, with unit cell parametera=7.232(1),b=11.725(2),c=9.768(1), β=105.50(1)°, andZ=4. ComplexII is also monoclinic, space group P21/a, witha=7.978(2),b=9.982(4),c=8.218(3), β=111.11(2)°, andZ=2. ComplexIII is orthorhombic, space group P212121, witha=8.098(1),b=11.902(1),c=13.682(2), andZ=4. The structures were solved by direct methods and refined by full-matrix least-squares to finalR values of 0.031, 0.043 and 0.036 for complexesI, II, andIII, respectively. ComplexesI andII show an octahedral coordination geometry. ComplexIII shows a square pyramidal coordination geometry. ComplexI forms infinite monodimensional chains where the SO 4 2− ions acts as a bridge between two neighboringen molecules. The vibrational spectra of these complexes agree well with their crystal structures. Structure and stability of seven other related Cu(II) complexes of (trien), (dien)2, (en)2 and (en) are inferred in this study.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02018691
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  • 3
    Digitale Medien
    Digitale Medien
    Models for residual time to AIDS (1996)
    Springer
    Lifetime data analysis 2 (1996), S. 31-49 
    Details
    ISSN: 1572-9249
    Schlagwort(e): Marker-dependent hazard ; Survival analysis ; Brownian motion ; Ornstein-Uhlenbeck process ; Disease markers
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik
    Notizen: Abstract The distributions of the time from Human Immunodeficiency Virus (HIV) infection to the onset of Acquired Immune Deficiency Syndrome (AIDS) and of the residual time to AIDS diagnosis are important for modeling the growth of the AIDS epidemic and for predicting onset of the disease in an individual. Markers such as CD4 counts carry valuable information about disease progression and therefore about the two survival distributions. Building on the framework set out by Jewell and Kalbfleisch (1992), we study these two survival distributions based on stochastic models for the marker process (X(t)) and a marker-dependent hazard (h(⋅)). We examine various plausible CD4 marker processes and marker-dependent hazard functions for AIDS proposed in recent literature. For a random effects plus Brownian motion marker process X(t)=(a+bt+BM(t))4, where a has a normal distribution, b〈0 is an unknown parameter and BM(t) is Brownian motion, and marker-dependent hazard h(X(t)), we prove that, given CD4 cell count X(t), the residual time to AIDS distribution does not depend on the time since infection t. Using simulation and numerical integration, we find the marginal incubation period distribution, the marginal hazard and the residual time distribution for several combinations of marker processes and marker-dependent hazards. An example using data from the Multicenter AIDS Cohort Study is given. A simple regression model relating the cube root of residual time to AIDS to CD4 count is suggested.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00128469
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  • 4
    Digitale Medien
    Digitale Medien
    Fractals related to Pascal's triangle (1996)
    Springer
    Acta applicandae mathematicae 42 (1996), S. 139-159 
    Details
    ISSN: 1572-9036
    Schlagwort(e): Primary 28A80 ; 58F08 ; Secondary 28A78 ; 05A10 ; 11B65 ; 11A07 ; 11A41 ; 11A51 ; 11A63 ; binomial coefficients ; fractals ; Hausdorff measure ; primary numbers ; self-similar sets
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik
    Notizen: Abstract A precise definition of a fractalF p r 1 derived from Pascal's triangle modulop r (p prime) is given. The number of nonzero terms in the firstp s lines of Pascal's triangle modulop r is computed. From this result the Hausdorff dimension and Hausdorff measure ofF p r 1 are deduced. The nonself-similarty ofF p r 1,r≥2, is also discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00047167
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  • 5
    Digitale Medien
    Digitale Medien
    Persistence and Leaching of Some Residual Herbicides in Uncropped Soils (1996)
    Springer
    Bulletin of environmental contamination and toxicology 56 (1996), S. 219 -224 
    Details
    ISSN: 1432-0800
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik , Medizin
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s001289900033
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  • 6
    Digitale Medien
    Digitale Medien
    Decay rates of solutions of an anisotropic inhomogeneousn-dimensional viscoelastic equation with polynomially decaying kernels (1996)
    Springer
    Communications in mathematical physics 177 (1996), S. 583-602 
    Details
    ISSN: 1432-0916
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik , Physik
    Notizen: Abstract We consider the anisotropic and inhomogeneous viscoelastic equation and we prove that the first and second order energy decay polynomially as time goes to infinity when the relaxation function also decays polynomially to zero. That is, if the kernelG ijkl satisfies $$\dot G_{ijkl} \leqq - c_0 G_{ijkl}^{1 + \frac{1}{p}} ;and G_{ijkl} ,G_{ijkl}^{1 + \frac{1}{p}} \in L^1 (\mathbb{R})for p 〉 2such that 2^m - 1〈 p,$$ then the first and second order energy decay as $$\frac{1}{{(1 + t)^q }}$$ withq=2 m −1.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02099539
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  • 7
    Digitale Medien
    Digitale Medien
    The dilution of silica in a NiZnCo spinel ferrite matrix (1996)
    Springer
    Applied physics 63 (1996), S. 453-459 
    Details
    ISSN: 1432-0630
    Schlagwort(e): 75.60E ; 75.60L ; 82.60
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract Silica may dissolve up to about 0.05 wt% in an iron excess NiZnCo spinel matrix, affecting noticeably the magnetic properties at low and high values of the applied field. The initial permeability is reduced by about 50% with the addition of only 0.1 % SiO2, while the coercivity almost triples, without noticeable changes in porosity or grain distribution. The vacancy and Fe2+ content of the sintered material also show a considerable change. The energy associated to the transformation Fe3+ → Fe2+ for the samples without SiO2 was found to be 0.41–0.42 eV, while for the samples with SiO2 additions it decreased to 0.26 eV. The changes in magnetic properties are thought to be caused, more than because of the mentioned changes in ion distribution, by the stresses and defects created in the lattice due to the very small size of the Si4+ ion, which substitutes Fe3+ ions in tetrahedral sites. The transition Fe3+ → Fe2+ seems to take place exclusively in the octahedral sites.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01571673
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  • 8
    Digitale Medien
    Digitale Medien
    The dilution of silica in a NiZnCo spinel ferrite matrix (1996)
    Springer
    Applied physics 63 (1996), S. 453-459 
    Details
    ISSN: 1432-0630
    Schlagwort(e): PACS: 75.60E; 75.60L; 82.60
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract.  Silica may dissolve up to about 0.05 wt% in an iron excess NiZnCo spinel matrix, affecting noticeably the magnetic properties at low and high values of the applied field. The initial permeability is reduced by about 50% with the addition of only 0.1% SiO2, while the coercivity almost triples, without noticeable changes in porosity or grain distribution. The vacancy and Fe2+ content of the sintered material also show a considerable change. The energy associated to the transformation Fe3+→Fe2+ for the samples without SiO2 was found to be 0.41–0.42 eV, while for the samples with SiO2 additions it decreased to 0.26 eV. The changes in magnetic properties are thought to be caused, more than because of the mentioned changes in ion distribution, by the stresses and defects created in the lattice due to the very small size of the Si4+ ion, which substitutes Fe3+ ions in tetrahedral sites. The transition Fe3+→Fe2+ seems to take place exclusively in the octahedral sites.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01571673
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  • 9
    Digitale Medien
    Digitale Medien
    Stretched-exponential approach in relaxing systems (1996)
    Springer
    Applied physics 63 (1996), S. 471-474 
    Details
    ISSN: 1432-0630
    Schlagwort(e): 02.60.Ed ; 75.60.L
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract The stretched-exponential or Kohlrausch-Williams-Watts function has been widely used in the description of a large variety of relaxation phenomena in condensed matter physics. In this work, we consider this approach as a fundamental law and extend its applicability range to thermally activated relaxation processes. A non-iterative and robust technique is developed in order to obtain the characteristic parameters of this type of phenomena. The method is based on a set of closed-form expressions for the amplitude, activation energy, pre-exponential factor and stretched-exponent that can be directly computed from isothermal curves. This strategy is applied to describe the magnetic disaccommodation spectra observed around room temperature in a magnetite sample.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01571676
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  • 10
    Digitale Medien
    Digitale Medien
    Stretched-exponential approach in relaxing systems (1996)
    Springer
    Applied physics 63 (1996), S. 471-474 
    Details
    ISSN: 1432-0630
    Schlagwort(e): PACS02.60.Ed; 75.60.L
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract. The stretched-exponential or Kohlrausch-Williams-Watts function has been widely used in the description of a large variety of relaxation phenomena in condensed matter physics. In this work, we consider this approach as a fundamental law and extend its applicability range to thermally activated relaxation processes. A non-iterative and robust technique is developed in order to obtain the characteristic parameters of this type of phenomena. The method is based on a set of closed-form expressions for the amplitude, activation energy, pre-exponential factor and stretched-exponent that can be directly computed from isothermal curves. This strategy is applied to describe the magnetic disaccommodation spectra observed around room temperature in a magnetite sample.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01571676
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