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  • 1985-1989  (10)
  • 1987  (10)
  • 1
    Electronic Resource
    Electronic Resource
    A metastable ion study of the electron impact fragmentation of some substituted 2,6-pyrido-containing crown ethers (1987)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 22 (1987), S. 633-636 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Extensive networks of metastable ions link the major peaks in the electron impact mass spectra of two crown ethers containing 2,6-pyrido units. High-resolution mass measurements and the metastable peaks allow the elucidation of the fragmentation pathways. The spectra are influenced more by the presence of aromatic substituents than by the 2,6-pyrido units.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210220911
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Translational diffusion of poly(methyl methacrylate) in acetone: wormlike vs. freely jointed chain model (1987)
    s.l. : American Chemical Society
    Macromolecules 20 (1987), S. 138-142 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00167a023
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Transmission electron microscopy study of defects in Sn-doped GaAs films grown by molecular beam epitaxy (1987)
    Springer
    Applied physics 44 (1987), S. 143-151 
    Details
    ISSN: 1432-0630
    Keywords: 68.55Jh ; 81.30Fb ; 68.35
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Films of GaAs, heavily doped with Sn, which have been grown by molecular-beam epitaxy are found to contain single-crystal Sn particles situated in the nearsurface region of the epilayer GaAs. The morphology and chemical composition of the particles have been examined by using cross-section transmission electron microscopy combined with energy-dispersive x-ray spectroscopy. Different growth conditions were used to study the Sn-particle formation and high-resolution transmission electron microscopy was used to investigate microstructures. The observations are discussed in terms of several models previously proposed for these phenomena.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00626415
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Accurate measurement of the temperature coefficient of the ultrasonic velocity of fused quartz near room temperature (1987)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 58 (1987), S. 1758-1761 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A technique has been adapted to measure the relative change in the acoustic velocity of materials at frequencies up to 500 MHz with a maximum sensitivity of one part in 107. This technique is applied to the measurement of the temperature coefficient of the longitudinal-acoustic velocity of fused quartz over the temperature range 28–47 °C. The longitudinal velocity is observed to increase linearly over this temperature range. The temperature coefficient of the fractional longitudinal velocity increase of fused quartz is determined to be (1.075±0.025)×10−4 °C−1. This number is in agreement with the results of previous investigators and is the most accurate measurement available at room temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1139382
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Structure, interaction, and growth of sodium dodecyl-o-xylenesulfonate micelles in aqueous solutions (1987)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 91 (1987), S. 1535-1541 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100290a049
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    The structure of Ni5Si2 formed in Ni-Si thin-film lateral diffusion couples (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 62 (1987), S. 1189-1194 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The microstructure of the nickel silicide, Ni5Si2, which forms during solid-state reactions using self-supporting Ni-Si lateral-diffusion couples, has been studied using high-resolution electron microscopy (HREM) and selected-area electron diffraction. Two different structures for Ni5Si2 have been identified, one of which is consistent with the crystal structure which has been reported to have an actual composition of Ni31Si12. There is evidence for the existence of a third structure. Variations in the distribution of these structures and the presence of planar defects may account for the reported composition range of Ni5Si2 in the Ni-Si phase diagram. The observed HREM images are compared with computer simulated images.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.339830
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  • 7
    Electronic Resource
    Electronic Resource
    Evidence for 2D XY Kosterlitz-Thouless transitions in magnetic graphite intercalation compounds (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 4398-4400 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetic graphite intercalation compounds (GIC's) allow a controlled separation of atomically abrupt magnetic layers by variation of the stage of the sample. Thus very small J'/J values (∼10−4) and quasi-two-dimensional behavior can be achieved where J' and J are, respectively, the interplanar and intraplanar exchange constants. The applicability of a 2D XY model is established by a comparison of the high-temperature susceptibility with the high-temperature series expansions for the various 2D and 3D models. Low-temperature studies provide values for magnetic interactions pertinent to the most interesting intermediate temperature range, where a 2D XY bound vortex phase may occur.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338437
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Ventricular fibrillation detection by a regression test on the autocorrelation function (1987)
    Springer
    Medical & biological engineering & computing 25 (1987), S. 241-249 
    Details
    ISSN: 1741-0444
    Keywords: Analysis ; Autocorrelation ; Defibrillation ; Performance ; Regression ; Signal ; Ventricular fibrillation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract The paper investigates quantitative differences in the signal characteristics of ventricular fibrillation (VF) and other cardiac arrhythmias. The analysis procedure comprises two steps: calculation of a short-term autocorrelation function (ACF) followed by a regression test on a plot of peak magnitudes of the ACF against lag values (the ACF/lag plot). We detect VF by testing the hypothesis that the ACF/lag plot of VF does not pass a linear regression test. Analysis of 31 separate episodes (of VF and other ventricular arrhythmias), each comprising three successive segments of 1·5s each produced the following results: (1) 100 per cent sensitivity (Se), 62 per cent specificity (Sp) and 74 per cent test efficiency (TE) after analysis of the first segment; (2) 100 per cent Se, 86 per cent Sp and 90 per cent TE after the second segment; and (3) 100 per cent Se, 100 per cent Sp and 100 per cent TE after the third segment. This method quantifies the notion that VF signals are nonperiodic with a random amplitude distribution, whereas ventricular tachycardia (VT) signals are usually periodic with more uniform amplitude distributions. Accurate discrimination and identification of VF can be very important in intensive-care settings, as well as in the design of automatic cardioverters and defibrillators.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02447420
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  • 9
    Electronic Resource
    Electronic Resource
    Determination of DBP and MBP in organic phase by ion chromatography (1987)
    Springer
    Journal of radioanalytical and nuclear chemistry 111 (1987), S. 429-440 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Dibutyl-and monobutylphosphoric acid in acidic toluene medium were determined by ion chromatography. The procedure involved stripping with dilute sodium hydroxide solution and used carbon tetrachloride as diluent, then detection with a conductivity meter. The effect of flow rate, eluent strength and stripping solution, the effect of chloride and nitrate ion on DBP, the effect on DBP in sodium hydroxide solution, and the effect of organic aliphatic acids were discussed. The detection limits of 0.19 ppm and 0.14 ppm were found for DBP and MBP, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02072875
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  • 10
    Electronic Resource
    Electronic Resource
    Translational diffusion of relatively short polystyrene chains in cyclohexane. II. An interpretation of hydrodynamic radius with the freely jointed chain model (1987)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 25 (1987), S. 1473-1480 
    Details
    ISSN: 0887-6266
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The translational diffusion coefficients for three relatively short, nearly monodisperse polystyrene chains (with molecular weights 2000, 4000, and 9000) in liquid cyclohexane have been measured up to 523.2 K using the extended Taylor dispersion method. The resultant hydrodynamic radii are successfully interpreted with the freely jointed chain model corrected for the approximations intrinsic to Kirkwood's theory with Stokes' radius as the only adjustable parameter, which is found to decrease with chain length but approach a constant value for long enough chains. The experimentally observed hydrodynamic radii of polystyrene standards with molecular weights 17,500, 50,000 and 100,000 at 308.2 K conform quite well to the values predicted with the approach formulated in this work.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1987.090250709
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