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Experimental Analysis of Horizontal Ground Heat Exchanger for Northern Tunisia

Journal of Electronics Cooling and Thermal Control 2012年第3期2卷 44-51页

作者： Nabiha Naili Issam Attar Majdi Hazami abdelhamid farhat Laboratory Thermal Processes Research and Technology Centre of Energy Hammam Lif Tunis Tunisie Laboratory Thermal Processes Research and Technology Centre of EnergyHammam Lif Tunis Tunisie

The aim of this study is first to evaluate the Tunisian geothermal energy and second to test the performance of horizontal ground heat exchanger. An experimental set-up has been constructed for climatic condition of Borj Cedria located in the north of Tunisia for space cooling. Results obtained during experiment were presented and discussed. The ground temperature at several depths was measured, the overall heat transfer coefficient (U) was determined. To evaluate the system efficiency, the energy analysis was applied;the energy efficiency was found to range from 14% to 28%. The heat exchange rate was quantified, the pressure losses were calculated. The total heat rejected by using the ground heat exchanger (GHE) system was compared to the total cool requirements of a tested room with 12 m2 surface. The results showed that the GHE, with 25 m of length buried at 1 m depth, covers 38% of the total cool requirement of the tested room. This study showed that the ground heat exchanger provide a new way of cooling buildings, it also showed that Tunisia have an important thermal potential. This favorable circumstance allows Tunisia to be a pioneer in the exploitation of geothermal energy for the installation of ground source heat pump systems.

关键词： Horizontal Ground Heat Exchanger Geothermal Hot Climate Energy Efficiency

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Experimental Study of Osmotic Dehydration of Date （Phoenix dactylifera L,）： Application for Lemsi Cultivars

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Journal of Food Science and Engineering 2013年第7期3卷 388-393页

作者： Sdayria Aymen farhat abdelhamid Bellagha Sihem Sahli Ali Laboratoire d 'Energ~tique et des Transferts Thermiques et Massique LETTM FST Universit~ de Tunis AI-Manar Tunisie Laboratoire de Maitrise des Technologies de l 'Energie LMTE Centre de Recherche et des Technologies de l 'Energie CRTEn BP95 Hammam Lif 2050 Tunisie lnstitut National Agronomique de Tunis Tunis 1082 Tunisie

The cultivar date Lemsi is well known in the coastal oasis of Tunisia for both its quality stage ＂blah＂ and its earliness. This variety is characterized by its astringent taste and has never been studied extensively. An osmotic dehydration treatment is necessary to improve the quality of the final product for maintaining its integrity. Thus, it is a preservation technique that is often used as pretreatment to obtain partially dehydrated fruit. In this experimental study, the cultivar date Lemsi were cut into cubes of 1 cm3 and were immersed in sucrose solutions of 50%, 60% and 70% at 20℃ for 0-240 min. The moisture content, the solute gain, the water loss and the ratio WL/SG are determined and discussed. The results deduced from this work have showed that sugar gain SG, water loss WL and the ratio WL/SG are increased with concentration of osmotic solution. Likewise, the osmotic dehydration treatment need to be followed of a convective drying to ensure the quality of the final product.

关键词： Osmotic dehydration Phoenix dactilifera L. lemsi cultivars water loss solute gain.

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Liver Function and Structure in Rats Treated Simultaneously with Cadmium and Mercury

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Open Journal of Pathology 2013年第1期3卷 26-31页

作者： Samir Haouem Issam Chargui Mohamed Fadhel Najjar Badreddine Sriha abdelhamid El Hani Department of Physiology Faculty of Medicine of Monastir Monastir Tunisia Laboratory of Biochemistry University Hospital of Monastir Monastir Tunisia Laboratory of Histology Cytology and Genetics Faculty of Medicine of Monastir Monastir Tunisia Laboratory of Pathology University Hospital Farhat Hached of Sousse Sousse Tunisia

The effect of cadmium chloride (150 mg/l) and mercury (II) chloride (80 mg/l) either alone or in combination in drinking water for 4 weeks on function and structure of the liver of male rats was studied. Results indicated that the ratio of liver weight to body weight and the activities of serum alanine aminotransferase, aspartate aminotransferase and alkaline phosphatase noted in rats co-exposed to cadmium and mercury were intermediate between those noted in the individually metal treated rats. The histopathological study showed that the individual metal and the combined metal treatments caused severe liver damage. The degree of these changes noted in rats co-exposed to cadmium and mercury was not higher than those signalized in individual treatment. The biochemical and the histological changes observed in rats co-exposed to cadmium and mercury show that there is not an additive effect between these two metals.

关键词： Cadmium Mercury Liver Toxicity Rat

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Combined Effects of Cd and Hg on Liver and Kidney Histology and Function in Wistar Rats

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Journal of Agricultural Chemistry and Environment 2016年第4期5卷 159-169页

作者： Karima Dardouri Samir Haouem Ines Gharbi Badreddine Sriha Zohra Haouas abdelhamid El Hani Mohamed Hammami Department of Physiology Faculty of Medicines of Monastir University of Monastir Monastir Tunisia Laboratory of Biochemistry Research Laboratory LR12 ES 05 Lab-NAFS “Nutrition-Functional Food & Vascular Health” Faculty of Medicines University of Monastir Monastir Tunisia Laboratory of Biochemistry Research Laboratory LR12 ES 05 Lab-NAFS “Nutrition-Functional Food & Vascular Health”Faculty of Medicines University of Monastir Monastir Tunisia Laboratory of Pathology University Hospital Farhat Hached Sousse Tunisia Laboratory of Histology Cytology and Genetics Faculty of Medicines of Monastir University of Monastir Monastir Tunisia

The present study was performed in order to discern the effects of combined exposure to cadmium and mercury on liver function and histopathological alterations in male adult Wistar rats. In the present investigation, cadmium (100 mg/l) and mercury (25 mg/l) were administered orally for 10 weeks separately or in combination. The rational for studying cadmium and mercury is that both of these metals are encountered frequently in the same contaminated areas. In liver, the activities of serum alanine aminotransferase (ALT) and aspartate amino tranferase (AST) increased significantly in the cadmium (Cd) and mercury (Hg) alone or in combination (Cd + Hg) compared to the control suggesting that both cadmium and mercury cause hepatotoxicity spatially when co-administrated. We noted an increase in serum lactate dehydrogenase (LDH) activity in Cd and combined Cd + Hg treated groups while it decreased in Hg treated group. There was no statistically significant change in the level of total bilirubilin. Serum urea concentration showed a significant increase in the Cd and Hg groups compared to the control group. However an increase in serum creatinine concentration was noted only in the combined treated rats showing that renal insufficiency is more serious in the co-exposed group. Light microscopic examination indicated severe histological changes in the two organs under Cd and mercury influence. Results of the present investigation clearly showed that mercury has profound effects of hepatic handling of cadmium (synergistic effect) as shown by histological and biochemical results. Moreover, we observed a antagonist effect between these two toxic metals on kidney markers such as urea.

关键词： Cadmium Chloride Mercuric Chloride Hepatotoxicity Kidney Damage Rat

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