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41.
The syndiotactic polystyrene can crystallize in different forms, depending on thermal and solvent treatments. The influence of the polymorphism on the dynamic-mechanical behavior has been analyzed. Thermogravimetric and calorimetric analysis were also carried out. The effects of phase transitions and solvent release on the relaxation phenomena were observed, and the correlations between structure and dynamic behavior allow to better understand some aspects of the polymorphism phenomena. 相似文献
42.
Vittoria Pierfelice 《manuscripta mathematica》2006,120(4):377-389
In this paper, we study the radial Schrödinger equation perturbed with a rough time dependent potential on the hyperbolic space. It is natural to expect that the curvature of the manifold has some influence on the dispersive properties, indeed we obtain the weighted Strichartz estimates for the perturbed Cauchy problem. We shall notice that our weighted Strichartz estimates makes possible to treat the nonlinearity of the form g(Ω, u) which are unbounded as |Ω| → ∞. 相似文献
43.
Ugo Azzena Giovanna DettoriMaria Vittoria Idini Luisa PisanoGrazia Sechi 《Tetrahedron》2003,59(40):7961-7966
Selective removal of the 4-methoxy group of 3,4,5-trimethoxystilbenes was performed under electron transfer conditions from Na metal in THF. Careful control of reaction conditions and quenching procedure allowed the synthesis of either (E)-3,5-dimethoxystilbenes or 3,5-dimethoxybibenzyls. 相似文献
44.
Franco Faustini Sergio De Munari Achille Panzeri Vittoria Villa Carmelo A. Gandolfi 《Tetrahedron letters》1981,22(45):4533-4536
In the reaction of α-aminoacids with excess NaNO2 in polyhydrogen fluoridepyridine, stereospecific substitution(i.e. retention of configuration) is observed with C6H11CH2CHNH2COOH, while a stereospecific rearrangment occurs in the case of phenylalanine. 相似文献
45.
A method for the determination of copper in complex matrices by electrothermal atomic-absorption spectrometry has been developed. It uses neocuproine as complexing agent. The detection limit is 0.2 ng/ml, and interferences are minimized. 相似文献
46.
47.
R. Kopp A. Argento A. C. Benvenuti D. Bollini G. Bruni T. Camporesi M. Cribier J. Cvach N. G. Fadeev J. Feltesse I. A. Golutvin M. Goossens G. Heiman D. Jamnik Y. T. Kiryushin V. S. Kisselev M. Klein V. G. Krivokhizhin V. V. Kukhtin W. Lohmann U. Meyer-Berkhout A. Milsztajn L. Monari F. L. Navarria W. D. Nowak A. Ouraou L. Piemontese P. Rich-Hennion Y. Sacquin I. A. Savin G. Smadja G. I. Smirnov A. Staude K. M. Teichert R. Tirler G. Todorova P. Todorov P. Verrecchia G. Vesztergombi M. Virchaux A. G. Volodko R. Voss J. Zacek Č. Zupančič BCDMS Collaboration 《Zeitschrift fur Physik C Particles and Fields》1985,28(2):171-174
48.
C. Szwaj S. Bielawski M.-E. Couprie C. Bruni M. Hosaka A. Mochihashi M. Katoh 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2010,59(3):451-455
We investigate the efficiency of the pulsed regime stabilization by
feedback control in a free electron laser (FEL) in oscillator
configuration. We show that a hidden dynamics remains in the
controlled FEL. Though not visible in the evolution of the pulse
envelope, this dynamics affects the internal pulse shape evolution,
and thus the FEL spectrum and coherence properties. The experimental
results obtained on the UVSOR FEL are interpreted in the framework
of a field master equation model. The stochastic nature of
spontaneous emission is taken into account, and appears as an
essential ingredient since the dynamics of the controlled structures
is governed by noise like the other stable regimes of the FEL. 相似文献
49.
Yajie Chen Trifon Fitchorov Anton L. Geiler Jinsheng Gao Carmine Vittoria Vincent G. Harris 《Applied Physics A: Materials Science & Processing》2010,100(4):1149-1155
A multiferroic heterostructure, consisting of a 25 μm thick Metglas® ribbon affixed to a lead magnesium niobate–lead titanate (PMN-PT) crystal, was systemically studied to investigate the time response of converse magnetoelectric coupling under the application of electric fields at low frequencies (0.05<f<10 Hz). This multiferroic heterostructure exhibits a considerably strong converse magnetoelectric effect, CME=?80%, where CME=[M(E)?M(0)]/M(0), and a converse ME coupling constant, A=22.5 Oe-cm/kV, at frequencies below 1 Hz and near saturation electric polarization. A switching time (t s), representing the response time of the CME coupling, is measured to be 0.6 seconds for this heterostructure under the application of instantaneous electric fields. The switching time results in significant influences on the magnetoelectric effect especially at frequencies higher than 2 Hz. The dynamic response of CME coupling is predominantly determined by ferroelectric relaxation within the PMN-PT crystal, as opposed to the magnetic relaxation of the Metglas® ribbon. A model was used to describe the dynamic behavior of CME coupling in disordered systems such as PMN-PT. 相似文献
50.
In this paper we consider the numerical integration on a polygonal domain Ω in ?2 of a function F(x,y) which is integrable except at a point \(P_{0}=(x_{0},y_{0})\in{\stackrel{\circ}{\Omega}}\), where F becomes infinite of order two. We approximate either the finite-part or the two-dimensional Cauchy principal value of the integral by using a spline finite element method combined with a subdivision technique also of adaptive type. We prove the convergence of the obtained sequence of cubatures. Finally, to illustrate the behaviour of the proposed method, we present some numerical examples. 相似文献