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  • Springer  (117)
  • 2020-2023
  • 1990-1994  (117)
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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
    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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  • 4
    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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  • 5
    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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  • 6
    Electronic Resource
    Electronic Resource
    Separation of tritium from deuterium by pulsed NH3 laser-selective multiple photon dissociation of CTCl3 (1991)
    Springer
    Applied physics 53 (1991), S. 246-249 
    Details
    ISSN: 1432-0649
    Keywords: 82.50 ; 33
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The multiple photon dissociation of ppm level CTCl3 in CDCl3 and the selectivity of T/D separation were investigated using a pulsed ammonia laser. The effect of laser frequency, fluence and buffer gas pressure on the dissociation rate and isotopic selectivity were studied. The depletion of CDCl3 was not observed within experimental errors. A lower limit of single step selectivity factor was found to be 〉5000 at 133 Pa substrate pressure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00357144
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  • 7
    Electronic Resource
    Electronic Resource
    Parametric studies of the optogalvanic effect in a low pressure CO2 cell (1990)
    Springer
    Applied physics 50 (1990), S. 67-70 
    Details
    ISSN: 1432-0649
    Keywords: 42.55Dk ; 42.60
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have investigated the optogalvanic effect (OGE) in the external cavity OG cell as a function of CO2 gas pressure, discharge current and chopping frequency. Usefulness of these investigations with regards to optogalvanic frequency stabilization of CO2 lasers has been discussed. In particular, we find that operation of the OG cell at low pressure (∼2.5 Torr) in conjunction with high (∼800 Hz) modulation offers the best condition for stabilization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00330096
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  • 8
    Electronic Resource
    Electronic Resource
    Four-branch oscillation from a dual-polarization cavity CO2 laser (1993)
    Springer
    Applied physics 57 (1993), S. 227-230 
    Details
    ISSN: 1432-0649
    Keywords: 42.55E ; 42.60D
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We report here for the first time multiline oscillation of a cw-CO2 laser on all the four branches 10P, 10R, 9P, and 9R where all laser wavelengths share a common gain medium. The 9R, 9P and 10R branch lines lased at the expense of the high-gain 10P branch lines for which the cavity offered very high transmission losses. The 10P(20) line was made to lase by constructing another cavity with orthogonal polarization, thereby easing the strong competition between this line and the relatively low-gain 9R, 9P and 10R branch lines within the gain medium which is common to both cavities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00334539
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  • 9
    Electronic Resource
    Electronic Resource
    An ICP-AES method for the determination of heavy rare earth elements (Eu-Lu) in high purity yttrium oxide (1992)
    Springer
    Microchimica acta 109 (1992), S. 261-268 
    Details
    ISSN: 1436-5073
    Keywords: yttrium oxide ; rare earths ; inductively coupled plasma-atomic emission spectrometry (ICP-AES)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Traces of heavy rare earth elements (Eu-Lu) were determined in high purity yttrium oxide by inductively coupled plasma atomic emission spectrometry. The yttrium oxide samples were dissolved in nitric acid and the solutions analyzed with a plasma produced by a 56 MHz RF generator at an output power of 1.5 kW. Using a high resolution sequential monochromator, interference-free spectral lines for Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu could be found for calibration. The detection limits for the above elements have been found to be slightly higher in the presence of yttrium matrix, than in aqueous solution. This could be attributed to background enhancements due to the presence of yttrium. The mean RSD of the method varied between 2.3% and 6.3% in the concentration range 0.01 and 0.5 μg/ml. The percentage recovery ranged from 84 to 106 for the different rare earth elements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01242481
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  • 10
    Electronic Resource
    Electronic Resource
    Determination of Y, Sm, Eu, Gd, Dy, Ho, Er in high purity terbium oxide by ICP-AES (1991)
    Springer
    Microchimica acta 103 (1991), S. 71-77 
    Details
    ISSN: 1436-5073
    Keywords: rare earths ; terbium oxide ; inductively coupled plasma atomic emission spectrometry (ICP-AES)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Inductively coupled plasma atomic emission spectrometry (ICP-AES) was employed to determine Y, Sm, Eu, Gd, Dy, Ho and Er in high purity terbium oxide. Terbium oxide was dissolved in 0.5 mol/l HNO3 and nebulized into the plasma generated by a 56 MHz RF generator at 1.5 kW output power. Using a Jobin-Yvon 1-m Czenry-Turner high resolution, high dispersion scanning monochromator, lines mutually interference-free as well as free of interference from the matrix Tb were chosen for the seven analytes. A set of standards containing the analytes in the concentration range 0.01–1.0 gmg/ml with 1 mg/ml Tb was used for calibration. It was necessary to apply background correction to the gross analyte line intensities in order to obtain linear calibration plots for the analytes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01245054
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