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61.
Roger Arnaud Pierre-Yves Chavant Fatiha Hagoug Nadia Pelloux-leon Jean-Louis Ripoll Yannick Vallee 《Phosphorus, sulfur, and silicon and the related elements》2013,188(1-4):319-320
Abstract i) When generated under FVT conditions α-imino-thioaldehydes undergo a cyclization to dihydro-1,3-thiazoles. ii) Thienium cations, generated during a Pummerer reaction, can be trapped with dienes. 相似文献
62.
We consider the sieve estimator of the operator of a Banach autoregressive process. We show the almost sure convergence when the operator is 2-summing, strictly 2-integral, afterwards 2-nuclear for the adequate norms. To cite this article: F. Rachedi, T. Mourid, C. R. Acad. Sci. Paris, Ser. I 336 (2003). 相似文献
63.
Fatiha Sahraoui 《Journal of Geometric Analysis》2006,16(1):167-185
According to S. Bochner [6, 7]: IfD =B +iℝ
n
is a tube domain in ℂ
n
, where B is a domain in ℝ
n
, and if
[(B)\tilde]\tilde B
is the convex envelope of B, then any holomorphic function on D extends to the tube domain
[(D)\tilde] = [(B)\tilde] + i\mathbbRn \tilde D = \tilde B + i\mathbb{R}^n
, which is a univalent envelope of holomorphy of D. We give a generalization of this result to (nonunivalent) tube domains
over a complex Lie group which admit a closed sub-group as a real form. Application: If (V, φ) is a tube domain over ℂ
n
and if B is the convex envelope of ϕ(V)∩ℝ
n
in ℝ
n
, then
[(V)\tilde] = B + i\mathbbRn \tilde V = B + i\mathbb{R}^n
is an envelope of holomorphy of (V, φ). 相似文献
64.
Fatiha Alabau-Boussouira 《Applied Mathematics and Optimization》2005,51(1):61-105
This work is concerned with the stabilization of hyperbolic systems by a nonlinear
feedback which can be localized on a part of the boundary or locally distributed. We show that general weighted integral inequalities together with
convexity arguments allow us to produce
a general semi-explicit formula which leads to decay rates of the energy in terms of the behavior of the nonlinear
feedback close to the origin.
This formula allows us to unify
for instance the cases where the feedback has a polynomial growth at the origin, with the cases
where it goes exponentially fast to zero at the origin. We also give three other significant examples
of nonpolynomial growth at the origin. Our work completes the work
of [15] and improves the results of
[21] and [22]
(see also [23]
and [10]). We also prove the optimality of our results for the one-dimensional wave equation
with nonlinear boundary dissipation. The key property for obtaining our general energy
decay formula is the understanding between convexity properties of an explicit function
connected to the feedback and the dissipation of energy. 相似文献
65.
We study the statistical prediction of a continuous time stochastic process admitting a functional autoregressive representation.
We construct an approximation of Parzen's optimal predictor in reproducing kernel spaces framework. This approach did not
require an estimation of the operator of the autoregressive representation.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
66.
Fatiha Alabau 《Transactions of the American Mathematical Society》1998,350(12):4709-4756
We give a constructive method for giving examples of doping functions and geometry of the device for which the nonelectroneutral voltage driven equations have multiple solutions. We show in particular, by performing a singular perturbation analysis of the current driven equations that if the electroneutral voltage driven equations have multiple solutions then the nonelectroneutral voltage driven equations have multiple solutions for sufficiently small normed Debye length. We then give a constructive method for giving examples of data for which the electroneutral voltage driven equations have multiple solutions.
67.
Madi Fatiha Largate Leila Nouar Leila Khatmi Djamel Eddine 《Journal of inclusion phenomena and macrocyclic chemistry》2013,76(3-4):379-384
Two models namely A and B were considered to investigate the inclusion process of ethylparaben into β-CD cavity by means PM3, HF/6-31G (d) and B3LYP/6-31G (d). The obtained results with PM3 method clearly indicate that the formed complexes are energetically favored with or without solvent; the B complex is found more favored than A complex. The calculated deformations energies show that the geometry of β-CD is deformed in the complexation process on the other hand the ethylparaben do not undergo deformation. Finally, From NBO analysis, the donor and acceptor interactions between ethylparaben and β-CD were analyzed and discussed. 相似文献
68.
We present here a pricing model which is an extension of the Cooperative Game concept and which includes a notion of Price-Dependent Demand. We present some existence results as well as some algorithms, and conclude by discussing a specific problem related to Network Pricing. 相似文献
69.
Mahdi Chiha Oualid Hamdaoui Fatiha Ahmedchekkat Christian Pétrier 《Ultrasonics sonochemistry》2010,17(2):318-325
The aim of this work was to study the emulsification assisted by ultrasonic probe (22.5 kHz) and investigate the removal of copper(II) ions from aqueous solution using water-in-oil-in-water (W/O/W) emulsion liquid membrane process (ELM). The membrane was prepared by dissolving the extractant bis(2-ethylhexyl)phosphoric acid (D2EHPA) and the hydrophobic surfactant sorbitan monooleate (Span 80) in hexane (diluent). The internal phase consisted of an aqueous solution of sulfuric acid. Effects of operating parameters such as emulsification time, ultrasonic power, probe position, stirring speed, carrier (D2EHPA) and surfactant (Span 80) concentrations volume ratios of organic phase to internal striping phase and of external aqueous phase to membrane (W/O) phase, internal phase concentration and choice of diluent on the membrane stability were studied. With ultrasound, the W/O emulsion lifetime were much higher than those reported previously by mechanical agitation. The effect of carrier and Cu(II) initial concentration on the extraction kinetics was also investigated. Nearly all of the Cu(II) ions present in the continuous phase was extracted within a few minutes. Additionally, the influence of H2SO4 concentration on the stripping efficiency was examined. 相似文献
70.
This paper presents a simple model for the study of the dissolution of calcite and precipitation of gypsum in acidic solutions. The numerical predictions of calcium and hydroxyl ion concentration have been used to develop approximate analytical expressions for the growth rate of calcium in solution, and the hydroxyl ions concentration. These expressions have been used in turn to determine the evolution of the kinetic rate constants, and to make predictions that show good agreement with experimental data. 相似文献