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  • 1
    Electronic Resource
    Electronic Resource
    Bifurcation phenomena in a periodically driven current filament and a conjecture on the turbulent patterns by computer simulations (1989)
    Springer
    Applied physics 48 (1989), S. 161-169 
    Details
    ISSN: 1432-0630
    Keywords: 72.20.Ht ; 72.20JV ; 05.45+b
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Bifurcation routes to chaos in a periodically driven current filament have been studied by computer simulations. By an impact ionization model, theS-shaped currentvoltage curve is perturbed by the dc+ac bias ofE 0+E acsin(27πf 0t). The bifurcation maps are described as a function ofE 0. In the prebreakdown region, the fractal basin boundary, the crisis and the intermittency are discussed, based on the general considerations of the carrier dynamics on the catastrophe manifold. The intermittent burst of the current filament is explained by the destabilization of the weak turbulence generated in the lower branch. In the diffusion-reaction model, the spatio-temporal mode patterns of the transverse carrier profile have revealed the competitive evolution of the hyper-freezing and the firing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01141279
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  • 2
    Electronic Resource
    Electronic Resource
    Immunological abnormalities in a patient with lysinuric protein intolerance (1987)
    Springer
    European journal of pediatrics 146 (1987), S. 427-428 
    Details
    ISSN: 1432-1076
    Keywords: Lysinuric protein intolerance ; LE cell ; Antinuclear antibodies ; Systemic lupus erythematosus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We report an 8-year-old girl with lysimuric protein intolerance and immunological abnormalities including impaired function of lymphocytes, the presence of LE cells, antinuclear antibodies, and hypergammaglobulinaemia. These abnormalities have not been reported before and may be due to an amino acid imbalance or protein malnutrition in cells or tissues. The coincidence of a pre-stage of systemic lupus erythematosus (SLE) and LPI is not excluded.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00444955
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  • 3
    Electronic Resource
    Electronic Resource
    A system of conservation equations arising in nonlinear dynamics of gas mixtures (1988)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 10 (1988), S. 145-159 
    Details
    ISSN: 0392-6737
    Keywords: Kinetic and transport theory ; Statistical mechanics ; Function theory, analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Sulla base di appropriate ipotesi fisiche, concernenti le frequenze di collisione, le distribuzioni di probabilità di «scattering» e le condizioni iniziali, si perviene a costruire un sistema diN equazioni di conservazione a partire dal sistema di Boltzmann, tramite il quale resta formulato un problema non lineare di evoluzione per gliN gas di una miscela assegnata. Vengono discusse le restrizioni sia fisiche che matematiche connesse con la soluzione del sistema trovato per i due casi di sola rimozione, e, rispettivamente, di rimozione e «scattering», occorrente fra le differenti specie di particelle costituenti la miscela di gas considerata.
    Abstract: Резюме На основе соответствующих гипотез относительно частот соударений, распределений вероятности рассеяния и начальных условий выводится системаN уравнений сохранения, исходя из системы Больцмана, определяющей нелинейную проблему эволюции дляN газов заданной смеси. Затем обсуждаются физические и математические ограничения, связанные с решением для рассматриваемой системы, для двух случаев: только удаление и удаление и рассеяние различных типов частиц, которые входят в рассматриваемую смесь.
    Notes: Summary On the basis of appropriate hypotheses, concerning the collision frequencies, the scattering probability distributions and the initial conditions, a system ofN conservation equations is derived starting from the Boltzmann system governing a nonlinear evolution problem for theN gases of an assigned mixture. The physical and mathematical constraints connected with the solution of the system so obtained are then discussed for the two cases of only removal and, respectively, of both removal and scattering between the different species of particles, which the mixture considered consists of.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02450096
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  • 4
    Electronic Resource
    Electronic Resource
    Nonlinear hyperbolicity in kinetic theory of a gas mixture (1988)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 10 (1988), S. 1013-1029 
    Details
    ISSN: 0392-6737
    Keywords: Kinetic and transport theory
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Nel presente lavoro si illustra un sistema di equazioni iperboliche non lineari di conservazione, che si incontra nello studio di un problema di evoluzione per una miscela di gas di particelle interagenti in presenza di soli effetti di rimozione. Soluzioni analitiche esplicite di tale sistema sono costruite e commentate su base sia matematica che fisica.
    Abstract: Резюме Рассматривается система нелинейных гиперболических уравнений сошранения, возникающих при исследовании проблемы эволюции смеси газов взаимодействующих частиц в присутствии зффектов удаления. Получаются точные аналитические решения для такой системы. Проводится обсуждение полученных результатов с математической и физической точек зрения
    Notes: Summary A system of nonlinear hyperbolic conservation equations, arising in the study of an evolution problem of a mixture of gases of interacting particles in the presence of only removal effects, is illustrated. Explicit analytical solutions to such system are obtained and commented on both mathematical and physical grounds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02450202
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  • 5
    Electronic Resource
    Electronic Resource
    High-pressure Raman study of a one-dimensional hydrogen-bonded crystal of cyanoacetylene (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 2814-2817 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: At room temperature, cyanoacetylene undergoes a liquid–solid transition at 70±30 MPa and further a polymerization reaction at 1.5 GPa. Raman spectra indicates that the crystal structure of the high-pressure phase is isomorphic with the monoclinic low-temperature structure (P21/m, Z=2), in which linear cyanoacetylene molecules are joined with CH NC hydrogen bonds to form infinite one-dimensional chains. The internal stretching frequency of the C–H proton donor decreases wtih increasing pressure, while that of the C 3/4 N proton acceptor increases. The librational modes associated with the rotational motions of the rigid molecules show large shifts to higher frequencies with pressure. The observed frequency shifts are attributed to the strengthening of the CH⋅⋅⋅NC hydrogen bond in the one-dimensional molecular chain.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456950
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  • 6
    Electronic Resource
    Electronic Resource
    High-pressure Raman study of liquid and crystalline C2H2 (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 4565-4568 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Raman spectra were measured for liquid (0–0.7 GPa), crystalline cubic (0.7–0.9 GPa), and orthorhombic (0.9–3.5 GPa) phases in C2H2 at room temperature. For the orthorhombic phase, the high-pressure behavior of the librational and internal vibrations was obtained in a wide pressure range. The frequencies of all the librational modes increased monotonically with pressure, while those of the internal modes showed a variety of frequency shifts depending on vibrational mode. These high-pressure data will be of great use for the construction of theoretical models for the intermolecular interactions in crystalline C2H2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.453768
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  • 7
    Electronic Resource
    Electronic Resource
    Solid state polymerization of cyanoacetylene into conjugated linear chains under pressure (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 778-782 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Cyanoacetylene underwent polymerization reaction in a solid phase at pressures above 1.5 GPa. The Raman study of the reaction product showed that the polymer had a conjugated linear backbone with CN pendant groups. The Raman spectra for this substituted polyacetylene demonstrated a resonance behavior similar to that reported for trans-polyacetylene. The optical gap associated with the π–π* transition in the conjugated system was smaller than that of trans-polyacetylene, probably due to the resonance interactions between the CN triple bonds and the conjugated double bonds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.457130
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  • 8
    Electronic Resource
    Electronic Resource
    Raman study of the solid-state polymerization of acetylene at high pressure (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 529-534 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The mechanism and kinetics of the pressure-induced polymerization of acetylene were studied by Raman spectroscopy. The polymerization reaction occurred in the orthorhombic phase at room temperature and pressures above 3.5 GPa. Dominant formation of trans-polyacetylene suggested that the monomer underwent trans opening of the triple bond and polymerized along the diagonal of the bc plane of the unit cell. The reaction was described as an idealized one-step and one-dimensional growth process by an Avrami equation with an exponent 1.34.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455441
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  • 9
    Electronic Resource
    Electronic Resource
    ACUTE CHANGES IN THE PROPERTIES OF BAROREFLEXES IN MAN AFTER p-BLOCKADE (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Clinical and experimental pharmacology and physiology 16 (1989), S. 0 
    Details
    ISSN: 1440-1681
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: 〈list xml:id="l1" style="custom"〉1To clarify whether acute changes in the properties of baroreflexes can occur in man, we evaluated the time course of baroreflex control of heart rate and cardiopulmonary baroreflex control of forearm vascular resistance (FVR) over 240 min after intravenous administration of propranolol (0.2 mg/kg) in 13 healthy young men.2Systolic and diastolic blood pressure remained unchanged after propranolol. Propranolol significantly decreased cardiac index and heart rate, and significantly increased total peripheral resistance. These effects remained unchanged for 240 min after propranolol.3Baroreflex control of heart rate was significantly augmented immediately after, and at 30, 60 min after propranolol, but partly reverted to the initial level afterwards. Cardiopulmonary baroreflex control of FVR was reduced immediately after, and at 30, 60 min after propranolol, but partly reverted to the initial level afterwards. Pressor responses to phenylephrine was reduced immediately after propranolol, but no significant differences were observed after 30 min.4These results suggest that acute changes in the properties of baroreflexes occur in man after propranolol.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1440-1681.1989.tb03008.x
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  • 10
    Electronic Resource
    Electronic Resource
    Hydrogen-induced amorphization and its effect on magnetic properties of the Laves-phase GdFe2 compound (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 62 (1987), S. 3314-3317 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The influence of hydrogenation on the structural change and magnetic properties of the Laves-phase GdFe2 compound has been investigated. Crystalline c-GdFe2 absorbs 4.4 hydrogen atoms per formula unit without any change in the crystal structure below 423 K. On the other hand, GdFe2 transforms to amorphous a-GdFe2H3.6 by hydrogenation from 423 to 523 K, where the decomposition of GdFe2 into GdH2 and α-Fe is prevented. The same amount of hydrogen (3.6 atoms per formula unit) dissolves in amorphous alloys produced by both hydrogenation and rapid quenching. Hydrogenation sharply reduces the Curie temperature of the crystalline alloy from 818 to 107 K, in contrast to the Curie temperature of 443 K for the hydrogen-induced amorphous alloy. The temperature dependence of the magnetization of the hydrogen-induced amorphous alloy is identical to that of the hydrogenated rapidly quenched amorphous alloy, suggesting similarity of their structures. The magnetization of the hydrogen-induced amorphous alloy shows a broad peak around 300 K. Above 300 K the magnetization of the amorphous alloys is largely uninfluenced by hydrogen. Below the peak it is reduced by hydrogenation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.339340
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