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  • Springer  (176)
  • 2020-2023
  • 1990-1994  (117)
  • 1975-1979  (59)
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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
    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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  • 3
    Electronic Resource
    Electronic Resource
    Oberflächenpotentiale von gemischten Einzelschichten aus normalen langkettigen Alkoholen und normalen Alkoxyäthanolen (1977)
    Springer
    Colloid & polymer science 255 (1977), S. 515-515 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01536502
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  • 4
    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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  • 5
    Electronic Resource
    Electronic Resource
    The effect of carbohydrates on the heat of fusion of water (1975)
    Springer
    Journal of solution chemistry 4 (1975), S. 581-590 
    Details
    ISSN: 1572-8927
    Keywords: Aqueous ; carbohydrates ; molar heat of fusion of water ; differential scanning calorimeter
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The freezing of aqueous solutions of carbohydrates has been studied using differential scanning calorimetry. The reduction in the molar heat of fusion of water is attributed to the nonfreezing of a proportion of the water in the presence of the dissolved carbohydrate. The effects of concentration and molecular weight have been investigated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00643380
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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
    Charge dependence of the solar modulation of multiply charged cosmic ray nuclei (1976)
    Springer
    Astrophysics and space science 44 (1976), S. 167-175 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The intensity and energy spectra of multiply charged cosmic ray nuclei, in the energy interval 250–1500 MeV/n, were studied at three different levels of solar activity, viz. in 1963, 1964 and 1967. The same detectors, nuclear emulsion stacks flown from Fort Churchill, Canada, were used to determine simultaneouslty the energy spectra of helium, C, N, O as well as H (Z=10–28) nuclei. An analysis of the measured spectra indicates that these can be interpreted in terms of: (a) the source spectrum as a Fermi spectrum with a spectral index of 2.65; (b) the interstellar propagation as in a Gaussian distribution of path lengths with a mean path length of 4 g cm−2 and (c) the interplanetary propagation as given by the numerical solution of the Fokker-Planck equation incorporating diffusion, convection and adiabatic deceleration. On comparing the measured ratios of He to H-nuclei (mean Z≃14) with the theoretically calculated values for the three levels of solar activity, it is found that within experimental uncertainties, the solar modulation is essentially the same for nuclei of same mass to charge ratio and is not dependent on the charge of the nuclei.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00650481
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  • 8
    Electronic Resource
    Electronic Resource
    High fluences of low energy (10–25 MeV/amu) C, N, O and heavier ions at 450 km altitude; results from the skylab experiment (1975)
    Springer
    Astrophysics and space science 35 (1975), S. 337-347 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract High fluences (i.e. the integrated fluxes) of C, N, O group of nuclei and some of the heavier ones, in the energy interval 10–25 MeV/amu, have been identified in a Lexan polycarbonate detector assembly exposed on the exterior of the Skylab for 73 days. The existence of large flux of low energy nuclei in the Skylab orbit is surprising since the minimum geomagnetic cut-off energy for fully stripped nuclei (A/Z=2) is ≃50 MeV/amu at the orbit of the satellite, and the period of exposure was a ‘quiet’ one, free from significant solar particle events. We have considered two sources for these particles: (i) partly ionized interplanetary ions accelerated within the magnetosphere and (ii) heavy nuclei trapped in the Earth's radiation belt. The flux and composition of the nuclei observed by us seem to be significantly different from those in the trapped radiation as known at present; hence it seems likely that the major part of the observed flux may be interpreted, in terms of partly ionized interplanetary ions that are further accelerated in the magnetosphere.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00637002
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  • 9
    Electronic Resource
    Electronic Resource
    Possible association of a hard X-ray source with a cosmic gamma-ray burst (1975)
    Springer
    Astrophysics and space science 33 (1975), S. L15 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00640116
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  • 10
    Electronic Resource
    Electronic Resource
    Adrenal corticosteroidogenesis after removal of ventral prostate gland (1991)
    Springer
    Cellular and molecular life sciences 47 (1991), S. 86-88 
    Details
    ISSN: 1420-9071
    Keywords: Prostatectomy ; adrenalΔ 5-3β-HSD ; serum corticosterone ; serum prolactin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Removal of the ventral prostate gland in adult male rats causes an increase in adrenal weight, and stimulation of adrenalΔ 5-3β-hydroxysteroid dehydrogenase activity along with elevation of serum levels of corticosterone and prolactin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02041262
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