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  • 1
    Electronic Resource
    Electronic Resource
    Brillouin light scattering on Fe/Cr/Fe films (abstract) : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 5987-5987 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Brillouin light scattering (BLS) was used to measure magnon frequency versus in-plane field H and in-plane wave vector for a Fe(38 A(ring))/Cr(13 A(ring))/Fe(38 A(ring)) thin film. Both easy [100] and hard [110] field directions were used. The in-plane wave vector was perpendicular to the field. The data were obtained with a high contrast multipass tandem 3+3 Sandercock Fabry–Perot interferometer, with a free spectral range of 30 GHz. The results were correlated with previous hysteresis measurements.1 In the low field region (H〈200 Oe), the magnon frequency decreases with increasing field in a manner consistent with soft mode behavior. The mode frequency in this low field region is slightly different on the Stokes (S) and anti-Stokes (AS) sides of the BLS spectra. At fields of 150–200 Oe one sees a cusp-like minimum in the magnon frequency field dependence. The S and AS frequencies also converge at this point. This is evidence for the antiparallel alignment of the two magnetizations of the Fe layers and the onset of canting.2 At higher fields (250–350 Oe) one sees a jump in frequency, followed by an apparent approach to saturation, and a further increase above 2 kOe. This behavior is basically the same for both field directions, but the frequencies are downshifted somewhat for the hard [110] direction. The wave-number k dependence is weak in the low field region. Above the jump, the magnon frequency shows a distinct increase with k. The substantial frequency increase with field above 2 kOe may indicate conversion to a surface mode character. This is consistent with the k dependence seen at high fields.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353494
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  • 2
    Electronic Resource
    Electronic Resource
    Brillouin light scattering on Fe/Cr/Fe thin-film sandwiches (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 3553-3563 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Brillouin light scattering (BLS) in the backscattering configuration has been used to study the magnetic excitations in epitaxial Fe(38 A(ring))/Cr(13 A(ring))/Fe(38 A(ring)) thin-film sandwiches. Spin-wave frequency was measured versus in-plane wave vector k and static in-plane magnetic field H for both [100] and [110] direction fields and with k perpendicular to H. The range of applied fields was 50–1500 Oe. The wave-number range was 0.45×105–2.3×105 rad/cm. The BLS spectra correlate with magnetization versus field profiles and confirm the antiferromagnetic coupling between the Fe layers. Under low-field conditions and near-antiparallel alignment of the Fe layer magnetization vectors, the spin-wave frequencies from the Stokes and anti-Stokes sides of the BLS spectra are different. These frequencies merge at high field. The low-field splitting feature is very sensitive to small differences in thickness for the magnetic layers and indicates a thickness difference of 9%. Matchups between features of the BLS data and magnetization curves were obtained for the following parameters: magnetic layer saturation induction 4πMs=18.6 kG; cubic anisotropy field HA=550 Oe; in-plane [110] uniaxial anisotropy field HU=76 Oe; antiferromagnetic interlayer exchange coupling field HJ=120 Oe. Spin-wave frequency calculations based on these parameters show quantitative agreement with the measurements. The quantitative fits require inclusion in the theory of an iron layer surface anisotropy with an effective surface anisotropy field of 2 kOe.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356092
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  • 3
    Electronic Resource
    Electronic Resource
    Microsomal suppression of Ehrlich ascites cell multiplication in mouse (1964)
    Springer
    Naturwissenschaften 51 (1964), S. 66-67 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00603466
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  • 4
    Electronic Resource
    Electronic Resource
    Quantum particle trajectories and geometric phase (2000)
    Springer
    JETP letters 72 (2000), S. 541-545 
    Details
    ISSN: 1090-6487
    Keywords: 03.65.Bz ; 03.75.−b
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Particle trajectories are defined as integrable dx μ dp μ=0 paths in projective space. Quantum states evolving on such trajectories, open or closed, do not delocalize in (x, p) projection, the phase associated with the trajectories related to the geometric (Berry) phase and the classical mechanics action. Properties at high energies of the states evolving on particle trajectories are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1348476
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  • 5
    Electronic Resource
    Electronic Resource
    Reactivity of acrylic monomers (1979)
    Springer
    Colloid & polymer science 257 (1979), S. 1203-1206 
    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
    Notes: Summary The copolymerization of N,N-diethylacrylamide (Ml) with methyl acrylate (M2) was investigated and reactivity ratiosr 1= 0.41 andr 2 = 0.52 obtained. Also the distribution of diad fractions was calculated and the results were interpreted in terms of the product of reactivity ratios. The tendency of the two monomers to alternate was explained on the basis of differences in polatities between the double bonds, this explanation being supported both by the values ofe parameter and NMR spectroscopy data. A copolymerization mechanism was suggested.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01517245
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  • 6
    Electronic Resource
    Electronic Resource
    Etude sur le comportement thermique de quelques polymeres ignifugeants contenant du phosphore et des halogenes (1981)
    Springer
    Journal of thermal analysis and calorimetry 20 (1981), S. 311-318 
    Details
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Résumé Le comportement thermique de certains polyhalogénophosphonates a été étudié à l'aide des données fournies par thermogravimétrie (TG) et analyse thermique différentielle (ATD). En partant de ces données on a calculé les énergies d'activation et les ordres de réaction par la méthode Coats-Redfern.
    Abstract: Zusammenfassung Das thermische Verhalten einer Reihe von Polyphosphonaten wurde durch Thermogravimetrie (TG) und Differentialthermoanalyse (DTA) untersucht. Die erhaltenen Angaben ermöglichten die Berechnung der Aktivierungsenergien und Reaktionsordnungen der Zersetzungszonen nach Coats-Redfern.
    Notes: Abstract The thermal behaviour a series of polyphosphonates was studied by thermogravimetry (TG) and differential thermal analysis (DTA). The obtained data permitted the calculation of activation energies and reaction orders on decomposition zones by the Coats — Redfern method.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01912879
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  • 7
    Electronic Resource
    Electronic Resource
    Polycondensation of tetrabromobisphenol a with chloromethylphosphonic dichloride (1979)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 30 (1979), S. 708-710 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Mittels IR- und NMR-Spektroskopie sowie Thermoanalyse werden der Mechanismus und die Geschwindigkeit der Polykondensation von Tetrabrom-Bisphenol A mit Chlormethylphosphonsäure-dichlorid sowie die Thermostabilität des hergestellten Polyphosphonats untersucht.
    Notes: Using IR and NMR spectroscopy and thermal analysis, the mechanism and rate of polycondensation of tetrabromobisphenol A with chloromethylphosphonic dichloride are studied and the thermal stability of the obtained polyphosphonate is discussed.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1979.010301109
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  • 8
    Electronic Resource
    Electronic Resource
    Electron microscopy and scanning electron microscopy study on blends of inflammable polymer/flame retardant polymer (1981)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 32 (1981), S. 333-336 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Mischungen aus brennbaren und flammfesten Polymeren wurden mittels Elektronenmikroskopie und Scanning-Elektronenmikroskopie untersucht. Die Abhängigkeit der Homogenität der Mischungen von der Natur und dem Verhältnis der beiden Komponenten wird diskutiert.
    Notes: Using electron microscopy and scanning electron microscopy blends of two polymers, an inflammable polymer and a flame retardant polymer, are studied. The dependence of their homogeneity on the kind and the ratio of the two components is discussed.
    Additional Material: 17 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1981.010320608
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  • 9
    Electronic Resource
    Electronic Resource
    Cationic polyelectrolytes. II. Amination of chloromethylated polystyrene with hydroxyalkylic secondary amines (1980)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 18 (1980), S. 2333-2346 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The reaction of chloromethylated polystyrene with methyl(2- hydroxyethyl)amine and butyle (2-hydroxyethyl)amine was studied kinetically. The reaction of benzyl chloride with these amines was also investigated for comparison. N,N-dimethylformamide and dioxane were used as solvents. The reactions of benzyl chloride with the two amines in these solvents took place according to normal kinetics of the second order. Reaction kinetics depend on the nature of the amine and solvent in Chloromethylated polystyrene reactions. In dioxane the self-accelerating effect of the reaction for β ≃ 0.5 is apparent. Steric hindrance of the reaction, beginning with a conversion degree of about 75%, wss observed for butyl(2-hydroxyethyl)amine in N,N-dimethylformamide. This self-accelerating effect is observed in dioxane at the same reaction degree. The activation energies and frequency factors were calculated for the amination of benzyl chloride and chloromethylated polystyrene with the two amines in N,N-dimethylformamide and dioxane.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1980.170180726
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  • 10
    Electronic Resource
    Electronic Resource
    Cationic polyelectrolytes. III. Nitrile-group reaction of macromolecular compounds with N,N-dialkylaminoalkylamines (1981)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 19 (1981), S. 2869-2880 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The chemical reaction in aqueous medium of polyacrylonitrile and acrylonitrile-vinyl acetate co-polymer using asymmetrical diamines of H2N—(CH2)m—NR2 (m = 2,3) structure was studied. It was found that the nitrile group is modified to an dialkylaminoalkylacrylamide group; also determined were the reaction conditions required to obtain the highest degree of chemical transformation of the nitrile groups. All modified compounds were characterized by analytical spectroscopy (IR and 1H NMR) and by rheological methods. It was also established that glutaronitrile can be used as a low-molecular-weight model to study the chemical transformation of nitrile groups in polyacrylonitrile and related polymers.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1981.170191120
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