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Search Results: 1 - 10 of 87825 matches for " I. Toumi "
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Existence of positive solutions for nonlinear boundary value problems in bounded domains of
Faten Toumi
Abstract and Applied Analysis , 2006, DOI: 10.1155/aaa/2006/95480
Abstract: Let D be a bounded domain in ℝn(n≥2). We consider the following nonlinear elliptic problem: Δu=f(⋅,u) in D (in the sense of distributions), u|∂D=ϕ, where ϕ is a nonnegativecontinuous function on ∂D and f is a nonnegativefunction satisfying some appropriate conditions related to someKato class of functions K(D). Our aim is to prove that the aboveproblem has a continuous positive solution bounded below by afixed harmonic function, which is continuous on D¯. Next, we will be interested in the Dirichlet problem Δu=−ρ(⋅,u) in D (in the sense of distributions), u|∂D=0, where ρ is a nonnegative function satisfying some assumptions detailed below.Our approach is based on the Schauder fixed-point theorem.
Existence of blowup solutions for nonlinear problems with a gradient term
Faten Toumi
International Journal of Mathematics and Mathematical Sciences , 2006, DOI: 10.1155/ijmms/2006/80605
Abstract: We prove the existence of positive explosive solutions for theequation Δu
Existence of Positive Bounded Solutions of Semilinear Elliptic Problems
Faten Toumi
International Journal of Differential Equations , 2010, DOI: 10.1155/2010/134078
Abstract: This paper is concerned with the existence of bounded positive solution for the semilinear elliptic problem in subject to some Dirichlet conditions, where is a regular domain in ? with compact boundary. The nonlinearity is nonnegative continuous and the potential belongs to some Kato class . So we prove the existence of a positive continuous solution depending on by the use of a potential theory approach. 1. Introduction In this paper, we study the existence of positive bounded solution of semilinear elliptic problem where is a -domain in with compact boundary, and are fixed nonnegative constants such that , and when is bounded. The parameter is nonnegative, and the function is nontrivial nonnegative and continuous on . Numerous works treated semilinear elliptic equations of the type For the case of nonpositive function , many results of existence of positive solutions are established in smooth domains or in , for instance, see [1–5] and the references therein. In the case where changes sign, many works can be cited, namely, the work of Glover and McKenna [6], whose used techniques of probabilistic potential theory for solving semilinear elliptic and parabolic differential equations in . Ma and Song [7] adapted the same techniques of those of Glover and McKenna to elliptic equations in bounded domains. More precisely, the hypotheses in [6, 7] require in particular that and on each compact, there is a positive constant such that . In [8], Chen et al. used an implicit probabilistic representation together with Schauder's fixed point theorem to obtain positive solutions of the problem ( ). In fact, the authors considered a Lipschitz domain in , with compact boundary and imposed to the function to satisfy on , where is nonnegative Borel measurable function defined on and the potentials are nonnegative Green-tight functions in . In particular, the authors showed the existence of solutions of ( ) bounded below by a positive harmonic function. In [9], Athreya studied ( ) with the singular nonlinearity , , in a simply connected bounded -domain in . He showed the existence of solutions bounded below by a given positive harmonic function , under the boundary condition , where is a constant depending on , , and . Recently, Hirata [20] gave a Chen-Williams-Zhao type theorem for more general regular domains . More precisely, the author imposed to the function to satisfy where the potential belongs to a class of functions containing Green-tight ones. We remark that the class of functions introduced by Hirata coincides with the classical Kato class introduced for
Existence of positive solutions for nonlinear boundary value problems in bounded domains of n
Faten Toumi
Abstract and Applied Analysis , 2006,
Abstract: Let D be a bounded domain in n ( n ≥ 2 ) . We consider the following nonlinear elliptic problem: Δ u = f ( , u ) in D (in the sense of distributions), u | D = , where is a nonnegative continuous function on D and f is a nonnegative function satisfying some appropriate conditions related to some Kato class of functions K ( D ) . Our aim is to prove that the above problem has a continuous positive solution bounded below by a fixed harmonic function, which is continuous on D ˉ . Next, we will be interested in the Dirichlet problem Δ u = ρ ( , u ) in D (in the sense of distributions), u | D = 0 , where ρ is a nonnegative function satisfying some assumptions detailed below. Our approach is based on the Schauder fixed-point theorem.
Comparative Effects of Drip and Furrow Irrigation with Saline Water on the Yield and Water Use Efficiency of Potato (Solanum tuberosum L.) in Arid Conditions of Tunisia
K. Nagaz,I. Toumi,M.M. Masmoudi,N.B. Mechlia
Agricultural Journal , 2013,
Abstract: Field experiment was conducted on a sandy soil during spring of 2005 in southern Tunisia for evaluating the effects of drip and furrow irrigation methods on soil salinity, yield and water use efficiency of potato (Solanum tuberosum L.). For both irrigation methods, irrigations were scheduled when readily available water in the root zone (35% of the total available water) was depleted. Well water with an ECi of 3.25 dS m 1 was used for irrigation. Growth, yield, yield components, water supply and soil salinity were measured. Results show that higher soil salinity was maintained in the root zone with furrow than drip irrigation. The growth and yield of potato irrigated through furrows were significantly lower when compared with drip irrigation. Potato yield was increased 11% relative to that for furrow irrigated potato. Under drip irrigation, 20.8% of the irrigation water was saved in comparison with furrow irrigated potato; and irrigation water use efficiency increased by 29% compared with that of furrow irrigation. Drip irrigation method provides significant advantage on yield and WUE, compared to furrow irrigation in potato production under experimental conditions. Therefore, the drip irrigation method is recommended to optimize the use of saline water in potato production under the arid mediterranean conditions of southern Tunisia.
Development of Analytical Model for Modular Tank Vehicle Carrying Liquid Cargo  [PDF]
M. Toumi, M. Bouazara, M. J. Richard
World Journal of Mechanics (WJM) , 2013, DOI: 10.4236/wjm.2013.32010

The study of dynamics of tank vehicles carrying liquid fuel cargo is complex. The forces and moments due to liquid sloshing create serious problems related to the instability of tank vehicles. In this paper, a complete analytical model of a modular tank vehicle has been developed. The model included all the vehicle systems and subsystems. Simulation results obtained using this model was compared with those obtained using the popular TruckSim software. The comparison proved the validity of the assumptions used in the analytical model and showed a good correlation under single or double lane change and turning manoeuvers.

Electromagnetic Modeling of a Planar Structure Integrating a Via-Hole Using the Method FWCIP  [PDF]
Sameh Toumi Sahli, Fethi Mejri, Taoufik Aguili
Open Journal of Antennas and Propagation (OJAPr) , 2016, DOI: 10.4236/ojapr.2016.42006
Abstract: We present in this paper a new formulation of the iterative method FWCIP “Fast Wave Concept Iterative Process” based on the wave concept. It calculates the electromagnetic parameters of a planar structure including a via-hole. This is modelled by the electromagnetic field that it creates in the structure. The validation of results found by this new formulation is ensured by comparison with those obtained by HFSS “high frequency structural simulator” software from Ansoft. They show that they are in good agreement.
Les Paralysies faciales post traumatiques a propos de 25 cas
N Beltaief, S Kharrat, G Besbes, S Toumi, I Kchock, S Trabelsi, K Nouira, S Sahtout, E Menif, S Hachicha
Journal Tunisien d'ORL et de Chirurgie Cervico-Faciale , 2006,
Fuzzy Control and Fuzzy Control Adaptive of a Robot Manipulator
Mellah Rabah,Toumi Redouane
Journal of Engineering and Applied Sciences , 2012,
Abstract: This study presents an investigation on trajectory control of a robot using fuzzy control and adaptive fuzzy control. We considered initially fuzzy controller of Mamdani type then to equip the proposed control scheme with adaptive controller, we have replaced the fuzzy regulators of Mamdani type by those of Seguno type in order to project the latter in neural networks, thus determining suitable fuzzy control rules and membership functions. We have synthesized two adaptive fuzzy controllers; Neural-fuzzy controller and Neural-fuzzy controller by model of reference.
Democracies in Action: A Foucaultian Perspective on British and French Tax Enforcement
E-rea : Revue électronique d’études sur le Monde Anglophone , 2009, DOI: 10.4000/erea.865
Abstract: Théoriser sur la démocratie conduit à l’envisager comme un idéal abstrait et universel, un concept fondateur désincarné. La démocratie doit également être appréhendée comme une pratique discursive mêlant pouvoir et savoir, complexe et enracinée dans un contexte socio-culturel particulier. En effet, le concept de gouvernementalité élaboré par Michel Foucault nous permet d’appréhender la Démocratie comme le produit culturel, diversifié et concret, de rapports de pouvoir. Les spécificités culturelles, temporelles, contextuelles de la Democratie se révèlent par exemple au travers des relations entre l’administration fiscale et les grandes entreprises. Sous les apparences d’un encadrement juridique strict se dévoilent des pratiques de pouvoir contingentes et variables que l’on peut comparer. Ainsi, la Démocratie en France révèle une attitude toute différente à la question du respect des règles fiscales et du dialogue possible entre administration et grandes entreprises, que celle adoptée dans le cadre démocratique britannique. La possibilité de faire accepter l’imposition est au c ur du dispositif fiscal britannique. En France, la relation entre le Fisc et les grandes entreprises se caractérise par une volonté de dominer et contr ler le contribuable et ne laisse aucune place au dialogue. Far from being a universal, abstract and ideological model, Democracy has to be understood as a multi-layered and complex set of relations, practices, networks and knowledge. Indeed, Michel Foucault’s concept of “gouvernementalité” provides a useful tool to understand the depth, pervasiveness and mundane nature of the contemporary exercise of power. On the basis of Foucault’s interpretation of modern power and politics, Democracy has to be seen as a network of rules, practices and bodies of knowledge. These rules and practices, which constitute the living everyday reality of Democracy are culturally determined, variable, evolving. The specificities as well as relative elasticity of democratic cultures are sharply visible in the relations between the tax administration and large corporations. Democracy can be seen in action in this field where rules are stretched to the best possible advantage and the deceptive tightly-knit texture of prescriptions reveals a loose net of imprecision, indeterminacy and subjectivity which can be used as the basis of negotiations between powerful economic actors and the State. French and British Democracies in action have developed contrasted frameworks and approaches to deal with these negotiations. Empirical research reveals that British ta
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