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  • Books
  • Articles  (6)
  • Analytical Chemistry and Spectroscopy  (4)
  • PACS: 79.20.D; 78.47; 77.84.L
  • elastic anisotropy
  • Chemistry and Pharmacology  (5)
  • Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics  (2)
Collection
  • Books
  • Articles  (6)
Source
Keywords
Publisher
Years
Topic
  • Chemistry and Pharmacology  (5)
  • Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics  (2)
  • Physics  (1)
  • 1
    Electronic Resource
    Electronic Resource
    59Co NMR of cobalt(III) porphyrin complexes. III.For Parts I and II, see Refs 1 and 2. Data base on substituent and solvent effects (1989)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 27 (1989), S. 1117-1129 
    Details
    ISSN: 0749-1581
    Keywords: 59Co NMR ; Six-coordinate complexes ; Porphyrin complexes ; Substituent effects ; Solvent effects ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A broad study of the 59Co NMR of cobalt(III) porphyrin complexes with axial amine ligands in a variety of solvents is reported. The data are presented in tabular form, as are the numerical correlations of chemical shift, δ, and line width, ω1/2, using the Kamlet-Taft equation. The dependence of δ and ω1/2 on ligand substituents is discussed. Solvent data, including mixed solvent results, indicate that general factors such as acidity, basicity, polarity and hydrogen-bonding capability are important, as are the specific nature of the functional groups on the ligands and the solvent.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260271204
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  • 2
    Electronic Resource
    Electronic Resource
    Conformational study of phosphoserine in aqueous solution. I - 13C n.m.r. results (1977)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 9 (1977), S. 504-507 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 13C chemical shifts and coupling constants of phosphoserine in aqueous solutions were studied as a function of pH values. Carboxyl and α-amino titration shifts agree with those observed in amino acids. The analysis of the coupling constants indicates that for rotation about the (C)—C—O—(P) axis the trans conformer predominates for all pH values. The fractional population of the gauche conformer reaches a maximum at pH=8.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270090903
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  • 3
    Electronic Resource
    Electronic Resource
    Conformational study of phosphoserine in aqueous solutions. II - 1H n.m.r. results (1977)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 10 (1977), S. 26-30 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The 270 MHz n.m.r. spectra of phosphoserine (PSer) have been measured and completely analysed for seven pD values. The resulting vicinal coupling constants 3J(HαHβ) and 3J(PHβ) are used to discuss the conformations of PSer with respect to the (Hα)—Cα—Cβ—(O) and (Cα)—Cβ—O—(P) bond axes. The all-trans conformer predominates for all pD values, with its fractional population being minimal at pD values close to neutrality. The Cβ—O bond rotamer populations agree reasonably well with those obtained from 13C investigations.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270100108
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  • 4
    Electronic Resource
    Electronic Resource
    Femtosecond- and nanosecond-pulse laser ablation of bariumalumoborosilicate glass (1999)
    Springer
    Applied physics 69 (1999), S. S763 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 79.20.D; 78.47; 77.84.L
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. Laser ablation with femtosecond pulses (130 fs, wavelength 800 nm, repetition rate 2 Hz) was compared with nanosecond-pulse ablation (10 ns, wavelength 266 nm, repetition rate 2.5 Hz) of bariumalumoborosilicate glass in air using the direct focusing technique. Different ablation thresholds and heat-affected zones were observed. The lateral and vertical machining precision was evaluated. Single nanosecond laser pulses in the far UV resulted in a bubble or a circular hole in the centre of the illuminated spot, depending on the applied fluence. The ablation behaviour in the case of near-IR femtosecond pulses contrasted to this. Bubble formation was not detected. It needed repeated pulses at the same spot to modify the surface until material removal could be observed (incubation). Cavity dimensions of less than the beam diameter were achieved in this case.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390051524
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  • 5
    Electronic Resource
    Electronic Resource
    Massenspektrometrische Fragmentierung von Metallkomplexen des Tropolons (1977)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 12 (1977), S. 727-731 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The fragmentation of metal complexes of tropolones is decisively infleunced by the metal atom. In contrast to the free ligand the elimination of carbon monoxide is greatly reduced. The formation of the metal-free fragments is commented upon, as well as the unusual elimination of water from the Cu derivative.
    Notes: Die Fragmentierung der Metallkomplexe von Tropolonen ist entscheidend vom Metallatom beeinflußt. Im Unterschied zum freien Liganden wird die Eliminierung von Kohlenmonoxid stark zurückgedrängt. Die Bildung von metalltreien Fragmentionen sowie die außergewöhnliche Wasserabspaltung der Cu-Verbindung werden beschrieben.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210121204
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  • 6
    Electronic Resource
    Electronic Resource
    New aspects of the single phase aggregate model for oriented polymers (1986)
    Springer
    Colloid & polymer science 264 (1986), S. 1010-1016 
    Details
    ISSN: 1435-1536
    Keywords: Oriented polymers ; elastic anisotropy ; aggregate model ; orientation parameters
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A reinvestigation of the single phase aggregate model (SPAM) of Ward applied to the elastic properties of uniaxially oriented polymers is presented. It is shown that the Voigt and the Reuss orientation average of elastic constants can be represented as a linear transformation in a 5-dimensional vector space. The corresponding transformation matrix can be diagonalized, showing that the eigenvalues of this transformation are the orientation parametersP 0 =1,P 2 andP 4 . Taking advantage of this representation an easy test of applicability of the SPAM is proposed. Possibilities to evaluate the SPAM parameters are reviewed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01410318
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