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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    JETP letters 72 (2000), S. 541-545 
    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.
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  • 2
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 3553-3563 
    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.
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  • 3
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 5987-5987 
    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.
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Naturwissenschaften 51 (1964), S. 66-67 
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Colloid & polymer science 257 (1979), S. 1203-1206 
    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.
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Journal of thermal analysis and calorimetry 20 (1981), S. 311-318 
    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.
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  • 7
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 18 (1980), S. 2347-2355 
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: It was found that the addition reaction between poly(4-vinylpyridinium chloride) and electrophilic vinyl compounds, such as acrylic acid, acrylamide, methylacrylate, and acrylonitrile. leads to ammonium quaternary polymers with a transformation degree that depends oil the reactivity of vinyl compounds. The structure of addition compounds was established by using 1H-NMR IR, and UV spectral methods. NMR-determined values of transformation degree indicate that the reactivity of vinyl compounds decreases as follows: \documentclass{article}\pagestyle{empty}\begin{document}${\rm CH}_{\rm 2} \hbox{=\hskip-1.5pt=} {\rm CH} \hbox{---} {\rm COOH} 〉 {\rm CH}_{\rm 2} \hbox{=\hskip-1.5pt=} {\rm CH} \hbox{---} {\rm CONH}_{\rm 2} 〉 {\rm CH}_{\rm 2} \hbox{=\hskip-1.5pt=} {\rm CH} \hbox{---} {\rm COOCH}_{\rm 3} 〉 {\rm CH}_{\rm 2} \hbox{=\hskip-1.5pt=} {\rm CH} \hbox{---} {\rm CN}$\end{document}
    Additional Material: 3 Ill.
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  • 8
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 23 (1985), S. 1267-1281 
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The macromolecular chain conformational state during the amination of chloromethylated polystyrene (CMPS) with two aliphatic amines, namely methyl(2-hydroxyethyl)amine (MHEA) and N,N-dimethyl(2-hydroxypropyl)amine (DM2HPA), has been studied. Viscosimetric and light scattering measurements were performed during reactions in binary solvent mixtures. The observed kinetic deviations have been related with the conformational transformations of the macromolecular chain.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 17 (1979), S. 3879-3888 
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The amination kinetics of benzyl chloride and chloromethylated polystyrene with three tertiary amines were studied: N-2-hydroxyethyl-dimethylamine, N,N-bis(2-hydroxyethyl)-methylamine, and triethylamine in N,N-dimethylformamide. The amination of chloromethylated polystyrene takes place with two reaction rate constants K1 and K2. K2 is higher than K1; hence there is a self-accelerating effect. This phenomenon is due to the influence of the positive electrostatic field of the macroion chain on amines that are nucleophilic reactants. The magnitude of the self-accelerating effect given by the K2/K1 ratio depends on the substituent volume of the nitrogen atom of the amine molecule.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 18 (1980), S. 449-454 
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A multifunctional crosslinked polymer resulted from a chloromethylated polystyrene reaction with tris(2-hydroxyethyl)amine. A benzyl chloride reaction (chosen as a structural unit model) with tris(2-hydroxyethyl)amine was investigated to explain the reasons for the crosslinking. Amino-ethers and tris(2-hydroxyethyl)amine hydrochloride in addition to ammonium quaternary salt were isolated from this reaction. The formation of amino-ethers proved that an ammonium quaternary salt rearrangement also takes place during the quaternization reaction. This rearrangement leads to chloromethylated polystyrene during its reaction with tris(2-hydroxyethyl)amine.
    Additional Material: 1 Tab.
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