Sfax, Tunisia

University of Sfax

Sfax, Tunisia

The University of Sfax is a university located in Sfax, Tunisia. It was founded in 1986 and is organized in 8 Faculties.The University of Sfax is a university based in Sfax .It was founded in 1986 under the name University of the South and then covers all academic institutions in the South. It is divided into three universities, including the current University of Sfax, with the creation of the University of Gabes in 2003 and the University of Gafsa in 2004. Wikipedia.

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Simons F.E.R.,University of Sfax
Journal of Allergy and Clinical Immunology | Year: 2010

Anaphylaxis occurs commonly in community settings. The rate of occurrence is increasing, especially in young people. Understanding potential triggers, mechanisms, and patient-specific risk factors for severity and fatality is the key to performing appropriate risk assessment in those who have previously experienced an acute anaphylactic episode. The diagnosis of anaphylaxis is based primarily on clinical criteria and is valid even if the results of laboratory tests, such as serum total tryptase levels, are within normal limits. Positive skin test results or increased serum specific IgE levels to potential triggering allergens confirm sensitization but do not confirm the diagnosis of anaphylaxis because asymptomatic sensitization is common in the general population. Important patient-related risk factors for severity and fatality include age, concomitant diseases, and concurrent medications, as well as other less well-defined factors, such as defects in mediator degradation pathways, fever, acute infection, menses, emotional stress, and disruption of routine. Prevention of anaphylaxis depends primarily on optimal management of patient-related risk factors, strict avoidance of confirmed relevant allergen or other triggers, and, where indicated, immunomodulation (eg, subcutaneous venom immunotherapy to prevent Hymenoptera sting-triggered anaphylaxis, an underused, potentially curative treatment). The benefits and risks of immunomodulation to prevent food-triggered anaphylaxis are still being defined. Epinephrine (adrenaline) is the medication of first choice in the treatment of anaphylaxis. All patients at risk for recurrence in the community should be equipped with 1 or more epinephrine autoinjectors; a written, personalized anaphylaxis emergency action plan; and up-to-date medical identification. Improvements in the design of epinephrine autoinjectors will help to optimize ease of use and safety. Randomized controlled trials of pharmacologic agents, such as antihistamines and glucocorticoids, are needed to strengthen the evidence base for treatment of acute anaphylactic episodes. © 2010 American Academy of Allergy, Asthma & Immunology.

This paper examines the nexus between CO2 emissions, energy consumption and economic growth using simultaneous-equations models with panel data of 14 MENA countries over the period 1990-2011. Our empirical results show that there exists a bidirectional causal relationship between energy consumption and economic growth. However, the results support the occurrence of unidirectional causality from energy consumption to CO2 emissions without any feedback effects, and there exists a bidirectional causal relationship between economic growth and CO2 emissions for the region as a whole. The study suggests that environmental and energy policies should recognize the differences in the nexus between energy consumption and economic growth in order to maintain sustainable economic growth in the MENA region. © 2013 Elsevier B.V.

Trabelsi A.,University of Sfax
Renewable Energy | Year: 2013

The present study aimed to develop a simple analytical model to investigate the potential use and implications of porous silicon (PS) as an antireflective coating in thin polysilicon solar cells. It analytically solved the complete set of equations necessary to determine the contribution that this material has on the internal quantum efficiency (IQE) of the cell when acting as an antireflective coating agent. The increase in the IQE, the contribution of the different regions of the cell, and the effects of the physical parameters of each region were derived and investigated in comparison with conventional solar cells.The findings revealed that the internal quantum efficiency of the solar cell with PS emitter is higher than that of the conventional one particularly for short-wavelengths (λ<0.6 μm). Furthermore, for photons with higher energy, the emitter contribution in the IQE is more significant than the base and depletion regions. For photons with smaller energy, on the other hand, the absorption coefficients are also smaller, which leads to a higher generation rate in the base region and, hence, to a more pronounced contribution from this region to IQE. Last but not least, the improvement of IQE is observed to increase with decreased PS thickness and with heavily doped PS emitter (N d ++=10 20cm -3). © 2012 Elsevier Ltd.

Zhani K.,University of Sfax
Renewable and Sustainable Energy Reviews | Year: 2013

The present paper deals with a theoretical and experimental study of a new generation of water desalination unit by solar energy using the humidification and dehumidification (HD) principle is constructed at the national engineering school of Sfax (34N, 10E), Tunisia. The good quality of distilled water obtained by this new concept favours its use for producing water for drinking and irrigation. A mathematical model based on heat and mass transfers in each component of the unit is developed. The resulting ordinary differential systems of equations are transformed into a system of algebraic equations using the orthogonal collocation method (OCM) and simulated using C++ software in a steady state regime. The numerical model is used to investigate the thermal performance of this kind of installation exposed to a variation of the control parameters. The thermal performance was evaluated by the gained output ratio (GOR) and the efficiency of the water solar collector. A series of experiments was conducted and compared with the simulation results to validate the developed models. As a result, the proposed models can be used for sizing and testing the behaviour of such a type of desalination unit. © 2013 Elsevier Ltd.

Bougatef A.,University of Sfax
Journal of Cleaner Production | Year: 2013

Today, there is an increasing demand for fish proteolytic enzymes in food industries. During processing, large quantities of waste are generated and discarded. These wastes, which represent an environmental problem to the fishing industry, constitute an important source of proteolytic enzymes and protein. The most important digestive enzymes from fish and aquatic invertebrate viscera are trypsins. These enzymes have a high activity over a wide range of pH and temperature conditions and exhibit high catalytic activity at relatively low concentration. These characteristics have made them suitable for different applications in many food processing operations. Considering the specific characteristics of these enzymes, fish processing by-products are currently used for trypsins extraction. This review describes the characteristics and various applications of fish trypsins in detergents, carotenoproteins extraction from shrimp waste, and protein hydrolysates production. Considering their biological significance and their increasing importance in biotechnology, a thorough understanding of fish trypsins functioning is needed.

Sai K.,University of Sfax
International Journal of Plasticity | Year: 2011

The paper gives a review of the main features introduced in the multi-mechanism models, of the present possibilities and of further developments. In the two last decades, various materials and mechanical effects were studied using multi-mechanism model types. Particular attention was given to the possible link between the mechanism definitions and the physical deformation sources. The main results of these works are first recalled. Propositions of future development for the multi-mechanism models are finally given. © 2010 Elsevier Ltd. All rights reserved.

Johnson K.R.,University of Sfax
Kidney International | Year: 2011

The reports of associations between albuminuria and estimated glomerular filtration rate and mortality are a major advance in understanding the progression of renal disease and its sequelae. These findings reinforce the importance of population risk profiling. However, application is limited by validity concerns due to substantial unexplained heterogeneity in many meta-analyses. Application to treatment decisions is premature given insufficient analysis of randomized trials of the association of by-arm differences in laboratory measures and by-arm differences in patient-relevant outcomes. © 2011 International Society of Nephrology.

University of Sfax and University of Tsukuba | Date: 2013-08-09

The present invention relate to a highly efficient and novel method, using clean technologies, for obtaining a natural bioactive concentrate that is rich on polyphenols from olive mill water (OMW). The clean technologies integrate centrifugation, a drowning-out crystallization-based separation process, and vacuum evaporation. The method provides a highly-concentrated polyphenol isolate (up to 99% (mass fraction)) from other components presents in OMW, with up to half of the polyphenol content being hydroxytyrosol. The isolated polyphenols exhibit anti-oxidant, anti-microbial, anti-inflammatory, and anti-carcinogenic activities; they can be prepared as solid particles, as an aqueous solution, in an emulsion, or as lipidic-based nanoparticles. The isolated polyphenols can be used in the food industry, cosmetic industry, or pharmaceutical industry.

Agency: European Commission | Branch: FP7 | Program: CP-FP | Phase: ENV.2010.1.1.5-1 | Award Amount: 4.82M | Year: 2011

Increases of atmospheric CO2 and associated decreases in seawater pH and carbonate ion concentration this century and beyond are likely to have wide impacts on marine ecosystems including those of the Mediterranean Sea. Consequences of this process, ocean acidification, threaten the health of the Mediterranean, adding to other anthropogenic pressures, including those from climate change. Yet in comparison to other areas of the world ocean, there has been no concerted effort to study Mediterranean acidification, which is fundamental to the social and economic conditions of more than 130 million people living along its coastlines and another 175 million who visit the region each year. The MedSeA project addresses ecologic and economic impacts from the combined influences of anthropogenic acidification and warming, while accounting for the unique characteristics of this key region. MedSeA will forecast chemical, climatic, ecological-biological, and socio-economical changes of the Mediterranean driven by increases in CO2 and other greenhouse gases, while focusing on the combined impacts of acidification and warming on marine shell and skeletal building, productivity, and food webs. We will use an interdisciplinary approach involving biologists, earth scientists, and economists, through observations, experiments, and modelling. These experts will provide science-based projections of Mediterranean acidification under the influence of climate change as well as associated economic impacts. Projections will be based on new observations of chemical conditions as well as new observational and experimental data on the responses of key organisms and ecosystems to acidification and warming, which will be fed into existing ocean models that have been improved to account for the Mediterraneans fine-scale features. These scientific advances will allow us to provide the best advice to policymakers who must develop regional strategies for adaptation and mitigation.

Agency: European Commission | Branch: FP7 | Program: CSA-SA | Phase: INCO.2013-9.1 | Award Amount: 1.03M | Year: 2013

CINEA brings together leading research organisations, industry associations and innovation players from the EU and the MED region to bridge the existing gap between research and innovation in the area of food and agriculture research (societal challange 2: food safety, sustainble agriculture). The ultimate goal is to facilitate the transfer of scientific knowledge to industries and public services and bi-regional cooperation between all stakeholders along the knowledge value chain in the agro-food domain, thus contributing to meeting European and national/regional sustainable development goals. This will be achieved through SWOT analysis of bi-regional R2I cooperation in the field of food and agriculture research with the feedback to policy level; Direct brokerage between research, public services and industry players in the agro-food area; Implementation of the CINEA innovation capacity building training programme Preparation of the set of pilot technology transfer projects involving European and Mediterranean research performers and users Creation of sustainable innovation support services CINEAs Central R2I Helpdesk Building synergies with other relevant initiatives in the region. The project builds on the fundamental of previous RTD cooperation capacity building initiatives (e.g. INCO ERA-WIDE projects MAP2ERA, FAWIRA, WATEREUS-MED) and involves leading Mediterranean research entities (INRAA, CBS, USF, USMBA), industry associations/ innovation support agencies (API, CGEM, ANVREDET). On the European side the consortium includes exemplarily innovative research organisations (CNRS) and technology providers (CENTA), and relevant expert organizations and facilitators in the field of innovation and technology transfer (UAGF, GIRAF).

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