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191.
Sans résuméOblatum 12-XI-1990 相似文献
192.
Jean-Pierre Demailly 《Inventiones Mathematicae》1996,124(1-3):243-261
Let be an ample line bundle
on a non singular projective
-fold .
It is first shown that
is very ample for
.
The proof develops an original idea of Y.T. Siu
and is based on a combination of the Riemann-Roch
theorem together with an
improved Noetherian induction technique for the Nadel multiplier ideal
sheaves. In the second part, an effective version of the big Matsusaka
theorem is obtained, refining an earlier version of Y.T. Siu: there is
an explicit polynomial bound
of
degree in the arguments,
such that is very ample for
. The refinement is obtained through
a new sharp upper bound for the dualizing sheaves of algebraic
varieties embedded in projective space.
Oblatum 30-I-1995 & 18-V-1995 相似文献
193.
Jean-Pierre Aubin Giuseppe Da Prato 《NoDEA : Nonlinear Differential Equations and Applications》1995,2(4):511-525
This paper is devoted to stability properties of solutions to stochastic differential equations obtained by a stochastic Lyapunov method. 相似文献
194.
Marc Baguelin Jacques LeFèvre Jean-Pierre Richard 《Journal of Computational and Applied Mathematics》2007
In many problems coming from the “complexity sciences”, the presence of high-dimensional state spaces and non-linear equations renders traditional mathematical objects useless. To deal with these issues, several approaches have recently been studied, most of them presenting the particularity of splitting the dynamical events in two categories; an upper level in which the events describe how the structure of the system changes (the meta-dynamics) and a lower level with the events describing the evolution of the elements in the structure (the dynamics). The state space is then not defined in extenso but unfolds or contracts during the evolution of the system. In term of simulation, this view allows us to deal with only a small part of the state space at each step avoiding the time and memory limitations. 相似文献
195.
Christophe Lerot Ghislain Blanquet Jean-Pierre Bouanich 《Journal of Molecular Spectroscopy》2003,219(2):329-334
Using a diode-laser spectrometer, we have measured H2-broadening coefficients of CH3D at low temperatures (153.5, 183.5, and 223.5 K) for four lines in the ν3 band. The collisional widths are obtained by fitting each absorption line with three lineshape models: the Voigt, Rautian, and Galatry profiles. The broadening coefficients are also calculated on the basis of a semiclassical model of interacting linear molecules by considering an atom-atom Lennard-Jones potential in addition to electrostatic contributions. By comparing the broadening coefficients at room and low temperatures the temperature dependence of these broadenings has been determined both experimentally and theoretically. 相似文献
196.
Lydéric Bocquet Jaroslaw Piasecki Jean-Pierre Hansen 《Journal of statistical physics》1994,76(1-2):505-526
The Fokker-Planck equation governing the evolution of the distribution function of a massive Brownian hard sphere suspended in a fluid of much lighter spheres is derived from the exact hierarchy of kinetic equations for the total system via a multiple-time-scale analysis akin to a uniform expansion in powers of the square root of the mass ratio. The derivation leads to an exact expression for the friction coefficient which naturally splits into an Enskog contribution and a dynamical correction. The latter, which accounts for correlated collisions events, reduces to the integral of a time-displaced correlation function of dynamical variables linked to the collisional transfer of momentum between the infinitively heavy (i.e., immobile) Brownian sphere and the fluid particles. 相似文献
197.
Jean-Pierre Aubin Georges Haddad 《Journal of Mathematical Analysis and Applications》2002,275(2):676-692
Given a target contained in a constrained set and an impulse control system governing the evolutions of runs or executions, that are hybrids of continuous and discrete evolutions, this paper studies and provides several characterizations of the capture basin of the target viable in the constrained set. It is the subset of initial runs from which start at least one run viable in the constrained set until it reaches the target in finite time. It also provides algorithms and regulation rules governing the runs that reach the targets while obeying state constraints. 相似文献
198.
Five membered ring carbalkoxy aminimides are prepared from 1,1-dimethylhydrazine and -chloroalkyl chloroformates in three steps. Upon heating, these aminimides give high yields of N,N-dimethylamino isocyanate. This intermediate dimerizes or can be trapped in the presence of a nucleophile. 相似文献
199.
Jean-Pierre Serre 《K-Theory》1989,3(3):199-204
Résumé Le présent rapport est limité à trois thèmes: evt, Riemann-Roch, schémas. Pour aller plus vite, j'ai laissé de côté les travaux de géométrie algébrique [10, 12–14] et d'algèbre homologique [7–9]; il me faut tout de même mentionner la grande influence qu'a eu [8] sur le développement de la théorie.
Editor's note (June 1989): Professor Serre was a member of the Fields Committee in 185–1966. The current article is his original report of 1965 to the committee concerning the work of A. Grothendieck. Professor Grothendieck received a Fields Medal in 1966, together with Michael Atiyah, Paul Cohen and Stephen Smale. 相似文献
200.
Le Gouët J Morvan L Alouini M Bourderionnet J Dolfi D Huignard JP 《Optics letters》2007,32(9):1090-1092
We demonstrate the generation of optically carried, broadly tunable, millimeter-wave signals with a dual-frequency single-axis Nd:YAG laser. A frequency difference as high as 127 GHz is reached thanks to an intracavity electro-optically tunable etalon made of lead zirconate tantalate (PLZT) ceramic. We show that the available frequency range is actually limited by the bandwidth of the amplification medium, namely, far beyond the usually accepted free spectral range value in the case of a single-axis laser. Both coarse discrete and fine continuous tunabilities are obtained with the same voltage-controlled device, opening the way to widely tunable low-phase-noise optically carried submillimeter or even terahertz sources. 相似文献