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204 results on '"Chaouachi, B."'

1. Study of Solar Heating Process of Greenhouse in the Gabès Region

Author

Anayed, N., Benhmidene, A., Assadi, B. H., Hidouri, K., Chaouachi, B., Boukhchina, R., Belkadhi, M. S., Ghosh, Arindam, Series Editor, Chua, Daniel, Series Editor, de Souza, Flavio Leandro, Series Editor, Aktas, Oral Cenk, Series Editor, Han, Yafang, Series Editor, Gong, Jianghong, Series Editor, Jawaid, Mohammad, Series Editor, and Khiari, Ramzi, editor

Published
2023
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5. Small bowel obstruction caused by congenital transmesenteric defect

Author

Nouira F, Dhaou Ben, Charieg A, Ghorbel S, Jlidi S, and Chaouachi B

Subjects
Bowel obstruction, children, congenital, internal hernia, Pediatrics, RJ1-570, Surgery, RD1-811
Abstract

Transmesenteric hernias are extremely rare. A strangulated hernia through a mesenteric opening is a rare operative finding. Preoperative diagnosis still is difficult in spite of the imaging techniques currently available. The authors describe two cases of paediatric patients presenting with bowel obstruction resulting from a congenital mesenteric hernia. The first patient had a 3-cm wide congenital defect in the ileal mesentery through which the sigmoid colon had herniated. The second patient is a newborn infant who presented with symptoms and radiographic evidence of neonatal occlusion. At surgical exploration, a long segment of the small bowel had herniated in a defect in the ileal mesentery. A brief review of epidemiology and anatomy of transmesenteric hernias is included, along with a discussion of the difficulties in diagnosis and treatment of this condition.

Published
2011

7. Design and simulation of an absorption diffusion solar refrigeration unit

Author

Chaouachi, B. and Gabsi, S.

Subjects
Solar energy -- Usage, Solar energy -- Environmental aspects, Cold storage -- Energy use, Absorption -- Properties, Refrigeration equipment -- Design and construction, Science and technology
Abstract

The purpose of this study was the design and the simulation of an absorption diffusion refrigerator using solar as source of energy, for domestic use. The design holds account about the climatic conditions and the unit cost due to technical constraints imposed by the technology of the various components of the installation such as the solar generator, the condenser, the absorber and the evaporator. Mass and energy conservation equations were developed for each component of the cycle and solved numerically. The obtained results showed, that the new designed mono pressure absorption cycle of ammonia was suitable well for the cold production by means of the solar energy and that with a simple plate collector we can reach a power, of the order of 900 watts sufficient for domestic use. Key words: Solar energy, simulation, absorption refrigeration, mono pressure, design, INTRODUCTION If the solar energy possesses the advantage to be 'clean', free and renewable, this last is probably, considered like an adapted potential solution, that answers in even time at [...]

Published
2007

13. Mutations of a new WD-repeat protein gene in Allgrove (Triple A) syndrome

Author

TULLIO-PELET, A., SALOMON, R., HADJ-RABIA, S., MUGNIER, C., de LAET, M.H., BROTTIER, P., CHAOUACHI, B., BAKIRI, F., CHAUSSAIN, J.L., WEISSENBACH, J., MUNNICH, A., and LYONNET, S.

Subjects
Gene mutations -- Analysis, Linkage (Genetics) -- Analysis, Nervous system -- Degeneration, North Africans -- Health aspects, Protein metabolism -- Genetic aspects, Biological sciences
Published
2000

17. Impact of wind on Ichkeul lagoon transparency

Author

Chaouachi, B., Ben Hassine, O.K., and Lemoalle, J.

Subjects
Secchi discs, Water transparency, Winds
Abstract

In the Ichkeul lagoon, the strong wind removes the particles and carries them in suspension because of the shallow water plan (about 1m, on an average). The most frequent wind blows from the West to the North-West sector. During spring and summer the amplitude of their speed fluctuations is moderate. On the contrary, it is pronounced in autumn and winter, a period of both weak and strong wind. The water transparency is evaluated by a Secchi disc. When the continental water supply and the wind turbulences are absent, the water of Ichkeul is clearear. Dans la lagune de l'Ichkeul, le vent fort remet les particules en suspension et diminue la transparence des eaux, en raison de la faible profondeur de ce plan d'eau (1m environ, en moyenne). Les vents les plus fréquents soufflent du secteur ouest à nord-ouest. L'amplitude des fluctuations de leur vitesse est modérée durant le printemps et l'été. En revanche, elle est accentuée en automne et en hiver, période durant laquelle sont enregistrées, à la fois, les plus faibles et les plus fortes vitesses du vent. La transparence des eaux est évaluée à l'aide du disque de Secchi. Les eaux de la lagune sont plus claires lorsqu'elles reçoivent, peu ou pas du tout, des apports d'eau continentale, chargée en alluvions et lorsqu'elles sont peu soumises à la turbulence résultant du vent. Published Vents

Published
2002

18. Numerical prediction of flow patterns in bubble pumps

Author

Universitat Rovira i Virgili, Benhmidene A; Chaouachi B; Bourouis M; Gabsi S, Universitat Rovira i Virgili, and Benhmidene A; Chaouachi B; Bourouis M; Gabsi S

Abstract

In the present study, the ammonia-water mixing flow in a bubble pump is numerically simulated. The flow patterns of a two-phase flow in a bubble pump were studied under different conditions of heat flux and tube diameter. A one-dimensional two-fluid model was developed under constant heat flux. This model was used to predict the variations in void fraction and liquid and vapor velocities throughout the tube. Then, the void fraction profile and the curve of liquid velocity versus vapor velocity were used to predict the flow patterns along the tube length. It was found that at heat fluxes below 15 kW m -2, bubbly, slug, and churn flows are the dominating regimes, and the length of these flow regimes depends on the tube diameter. For heat fluxes higher than 15 kW m-2, the bubble pump operates under the churn and annular regimes, and the bubble pump performance is improved when the tube diameter increases. © 2011 American Society of Mechanical Engineers.

Published
2011

19. Modelling of heat flux received by a bubble pump of absorption-diffusion refrigeration cycles

Author

Universitat Rovira i Virgili, Benhmidene A; Chaouachi B; Gabsi S; Bourouis M, Universitat Rovira i Virgili, and Benhmidene A; Chaouachi B; Gabsi S; Bourouis M

Abstract

In the present study, the heat flux received by a bubble pump, which was simulated to a vertical tube 1 m long and with a variable diameter, was optimized. A numerical study was carried out in order to solve balance equations concerning the water-ammonia mixture in the up flow. The two-fluid model was used to derive the equations. A numerical study was carried out on a heat flux between 1 and 70 kW m−2 and the liquid velocity was determined. The optimum flux was determined for a tube diameter equal to 4, 6, 8 and 10 mm and a mass flow rate ranging from 10 to 90 kg m−2 s−1. The optimum heat flux was correlated as a function of the tube diameter and mass flow rate, while the minimum heat flux required for pumping was correlated as a function of the tube diameter.

Published
2011

39. RP-WP-20 Imagerie des masses hepatiques de l’enfant

Author

Douira-Khomsi, W., primary, Hedhli, M., additional, Louati, H., additional, Jarraya, M., additional, Ben Hassine, L., additional, Boukadi, A., additional, Ghorbel, S., additional, Hammou, A., additional, Chaouachi, B., additional, and Bellagha, I., additional

Published
2009
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41. Ictère chez un nourrisson

Author

Khemakhem, R., primary, Chouikh, T., additional, Rahay, H., additional, Ghorbel, S., additional, Nouira, F., additional, Cennoufi, F., additional, Louati, H., additional, Jlidi, S., additional, Bellagha, I., additional, and Chaouachi, B., additional

Published
2009
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