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Sidi Bouzid, Tunisia

Tyler S.,Adaptive Resource Management Ltd | Moench M.,ISET
Climate and Development | Year: 2012

Climate change will have unavoidable impacts on urban systems and populations, especially in Asia where many large cities are exposed. Climate adaptation will be essential, and planning for adaptation can be simplified through operationalizing concepts of climate resilience and vulnerability. This article reviews concepts and theories in a range of diverse fields to illustrate how the general notion of urban climate resilience can be developed into an operational framework for planning practitioners. The framework integrates theoretical and empirical knowledge of the factors contributing to resilience with processes for translating those concepts into practice. The framework includes characteristics of urban systems, the agents (people and organizations) that depend on and manage those systems, institutions that link systems and agents, and patterns of exposure to climate change. It operationalizes these concepts through structured and iterative shared learning approaches that allow local planners to define these factors in their own context, in order to develop practical strategies for local action. The viability of the framework is demonstrated through examples from resilience planning activities undertaken in 10 cities across Asia through the Asian Cities Climate Change Resilience Network funded by the Rockefeller Foundation. © 2012 Copyright Taylor and Francis Group, LLC. Source

Makni M.,University of Sfax | Haddar A.,ISET | Haddar A.,University of Sfax | Kriaa W.,University of Sfax | Zeghal N.,University of Sfax
International Journal of Food Properties | Year: 2013

The antioxidant capacity, total phenolics, flavonoids, and condensed tannin contents of Ajuga iva leaf extracts obtained with different solvent polarities were investigated. The antibacterial and antifungal proprieties were also studied using different microorganisms. The methanol extract with the highest amounts of total phenolics and flavonoids showed the highest antioxidant activities in all assays, followed by the aqueous chloroform and hexane extracts, respectively. The methanol extracts of Ajuga iva exhibited promising antibacterial and antifungal activities, indicating that Ajuga iva leaves might be used in further investigations for developing new antioxidants. Copyright © Taylor & Francis Group, LLC. Source

Mhamdi T.,ISET | Mhamdi T.,Research Unit of Photovoltaic | Hidouri N.,IPEI | Hidouri N.,Research Unit of Photovoltaic | Sbita L.,Research Unit of Photovoltaic
2012 1st International Conference on Renewable Energies and Vehicular Technology, REVET 2012 | Year: 2012

In this paper, the Authors present a hybrid photovoltaic-diesel system control. The considered system is composed of a self exited induction generator (SEIG), a photovoltaic array (PV array) and a fuzzy supervisor associated to an isolated DC load. The diesel motor is used to drive the SEIG in order to feed an isolated DC load through a diode rectifier, LC-LC filter and a DC bus when the PV array power is insufficient. In this case the load is fed by both the SEIG and the photovoltaic panel. In the other case, when the PV array power is sufficient, the load receives the input power only from the photovoltaic array through a boost converter and a DC bus. A modeling study was performed for the proposed Hybrid system components. Modeling of the PV array, SEIG, Diesel engine, rectifier, LC-LC filter, DC bus and boost converter were established and used in the proposed control scheme. To control the power flow and to coordinate the system operation, a fuzzy supervisor is developed and used. In the other hand, a fuzzy voltage controller is associated to the boost converter in order to adapt the PV voltage and the load. An extensive simulation work was performed to extract the significant results. To show up the high system performances, presented results are discussed and prove how the proposed methodology is an efficient hybrid photovoltaic diesel control procedure. © 2012 IEEE. Source

Rabai T.,ISET | Mnasri C.,ISSAT | Gasmi M.,INSAT
2013 International Conference on Electrical Engineering and Software Applications, ICEESA 2013 | Year: 2013

This paper proposes a control approach for a class of electromechanical systems based on immersion and invariance method. Two cases are considered: full information system and unknown parameters existence. Thereafter, two controllers are, respectively, proposed: stabilization control and adaptive control. The effectiveness of the obtained control schemes is illustrated via simulation of an example. © 2013 IEEE. Source

Orleans Reed S.,ISET Vietnam | Friend R.,ISET | Toan V.C.,National Institute for Science and Technology Policy and Strategic Studies | Thinphanga P.,Thailand Environmental Institute | And 2 more authors.
Environment and Urbanization | Year: 2013

This paper considers how resilience thinking and, in particular, its emphasis on learning has been applied in 10 cities in Vietnam, India, Thailand and Indonesia. Applying a "shared learning" approach in the Asian Cities Climate Change Resilience Network (ACCCRN) has helped to create or strengthen networks, build appreciation for complexity and uncertainty among stakeholders, provide a space for deliberating concepts such as vulnerability and resilience, and build knowledge and capacities for stakeholders to engage and represent their own interests. Shared learning approaches face considerable challenges navigating politicized urban environments, in which the nature and value of existing systems-and therefore the value of building resilience-are contested. This article suggests that deliberate, strategic intervention by facilitators may contribute to more transformative change on behalf of equitable, socially just outcomes-and thus cautions against seeing urban climate vulnerability as a technical challenge, or shared learning as a "toolkit" for building resilience. © 2013 International Institute for Environment and Development (IIED). Source

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