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Chandoul B.,Higher Institute of Technological Studies | Zouari I.,Higher Institute of Technological Studies | Bellagi A.,ENIM
International Journal of Applied Engineering Research | Year: 2012

This work presents a theoretical analysis and experimental pressing process of Kraft paper. In this paper, an analytical model of pressing paper was developed and validated against data obtained in experiments on Kraft paper 70 g / m 2 produced by the paper machine PM2 at the Tunisian Industrial Paper and board (SOTIPAPIER). This model assumes that the process consists of pressing an operation of external heating followed by isothermal compression and that the paper used to behave during this process, as a spring that is compressed. The predictions of this model indicate a good fit with the experimental results. It shows that for greater dryness at the exit of the press section, it is advisable to work at higher temperatures and stronger constraints. © Research India Publications. Source

Trimeche A.,University of Monastir | Sakly A.,ENIM | Mtibaa A.,National Engineering School of Tunis
International Review of Automatic Control | Year: 2013

For multiple-input multiple-output (MIMO) systems, the optimum maximum likelihood (ML) detection requires tremendous complexity as the number of antennas or modulation level increases. This paper proposes a new algorithm which attains the ML performance with significantly reduced complexity Based on the metaheuristic algorithm HISD (Hyperplane Intersection and Selection Detector). We apply a new type of cost function and give an efficient calculation algorithm. This detection is determinate from the diversification and the intensification methods. © 2013 Praise Worthy Prize S.r.l. - All rights reserved. Source

Radhouane A.,ENIM | Said N.M.,ENIM | Mhiri H.,ENIM | Le Palec G.,French National Center for Scientific Research | Bournot P.,French National Center for Scientific Research
Fluid Dynamics and Materials Processing | Year: 2010

"Twin jets in crossflow" is a complex configuration that raises an increasing interest due to its presence in various common applications such as chimney stacks, film cooling, VSTOL aircrafts, etc... In the present paper, the twin jets were arranged inline with an oncoming crossflow; they were also inclined which resulted in similar elliptic cross sections of the nozzles' exits. The exploration of the flows in interaction was carried out numerically by means of the finite volume method together with the second order turbulent closure model, namely the Reynolds stress Model (RSM), and a non uniform grid system particularly refined near the injection nozzles. Once validated, the model was upgraded by introducing a temperature gradient and a non reacting fume within the emitted jets in order to follow its dispersion stages. Such a procedure is likely to give an extensive understanding of the resulting flowfield's mixing, expanding and dispersion. In a primer step, we showed the qualitative similarity of the different species' behaviors due to the adopted non reactive property of the handled fume. Then, we evaluated the impact of the jets' initial inclination angle on the emitted fume as well as on the environing air dispersion over the domain. A close dependence of both progressions is observed. Straightening the jets proved to enhance significantly the vertical ascension of the fume, postponing the homogenization of the resulting flowfield composition. © 2010 Tech Science Press. Source

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