500 research outputs found
Economic factors affecting obesity: an application in Italy
No full textThe World Health Organization has stated that obesity is spreading around the world like a “global epidemic”. In 2004 the percentage of obese people in the Italian population was 9%, but the trend s increasing in recent years. Focusing on this country, the purpose of the paper is to analyze the socio-economic variables affecting obesity by means of a survey conducted in a consumer sample. Our analysis is based on a survey conducted in Italy, and the sample was composed of 999 consumers. We used a binary logit model and the dependent variable is body mass index (BMI), expressed in a dichotomic way (seriously overweight and obese, value 1, and normal weight, value 0). The results show that the condition of the seriously overweight and obese increases with age, especially in people over 65 of age. Also gender is correlated with the pathology: being seriously overweight and obese is far more likely for men than for women. An inverse relation was shown between obesity and education, and between obesity and the level of food knowledge. The results highlight that disadvantaged social categories are more susceptible to the problem of overweight and obesity. A policy implication of the analysis, to limit the spread of obesity, could lie in programs aimed at improving health and food awareness and focused on these minority groups.economics of obesity, BMI and consumer, logit model, Food Consumption/Nutrition/Food Safety, Health Economics and Policy,
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No full textDetecting pathogens and mounting immune responses upon infection is crucial for animal health. However, these responses come at a high metabolic price (McKean and Lazzaro, 2011, Kominsky et al., 2010), and avoiding pathogens before infection may be advantageous. The bacterial endotoxins lipopolysaccharides (LPS) are important immune system infection cues (Abbas et al., 2014), but it remains unknown whether animals possess sensory mechanisms to detect them prior to infection. Here we show that Drosophila melanogaster display strong aversive responses to LPS and that gustatory neurons expressing Gr66a bitter receptors mediate avoidance of LPS in feeding and egg laying assays. We found the expression of the chemosensory cation channel dTRPA1 in these cells to be necessary and sufficient for LPS avoidance. Furthermore, LPS stimulates Drosophila neurons in a TRPA1-dependent manner and activates exogenous dTRPA1 channels in human cells. Our findings demonstrate that flies detect bacterial endotoxins via a gustatory pathway through TRPA1 activation as conserved molecular mechanism.sponsorship: Vlaams Instituut voor Biotechnologie Alessia Soldano Luis Franco Guangda Liu Natalia Mora Emre Yaksi Bassem A Hassanr Fonds Wetenschappelijk Onderzoek G.0702.12 Alessia Soldano Yeranddy A Alpizar Brett Boonen Alejandro Lopez-Requena Natalia Mora Thomas Voets Rudi Vennekens Bassem A Hassan Karel Talaverar Fonds Wetenschappelijk Onderzoek G.0077.15 Alessia Soldano Yeranddy A Alpizar Brett Boonen Alejandro Lopez-Requena Natalia Mora Thomas Voets Rudi Vennekens Bassem A Hassan Karel Talaverar Fonds Wetenschappelijk Onderzoek G.0680.10 Alessia Soldano Yeranddy A Alpizar Brett Boonen Alejandro Lopez-Requena Natalia Mora Thomas Voets Rudi Vennekens Bassem A Hassan Karel Talaverar Fonds Wetenschappelijk Onderzoek G.0681.10 Alessia Soldano Yeranddy A Alpizar Brett Boonen Alejandro Lopez-Requena Natalia Mora Thomas Voets Rudi Vennekens Bassem A Hassan Karel Talaverar Fonds Wetenschappelijk Onderzoek G.0503.12 Alessia Soldano Yeranddy A Alpizar Brett Boonen Alejandro Lopez-Requena Natalia Mora Thomas Voets Rudi Vennekens Bassem A Hassan Karel Talaverar Fonds Wetenschappelijk Onderzoek G.0654.15 Alessia Soldano Yeranddy A Alpizar Brett Boonen Alejandro Lopez-Requena Natalia Mora Thomas Voets Rudi Vennekens Bassem A Hassan Karel Talaverar Fonds Wetenschappelijk Onderzoek G.0761.10N Alessia Soldano Yeranddy A Alpizar Brett Boonen Alejandro Lopez-Requena Natalia Mora Thomas Voets Rudi Vennekens Bassem A Hassan Karel Talaverar Fonds Wetenschappelijk Onderzoek G.0596.12 Alessia Soldano Yeranddy A Alpizar Brett Boonen Alejandro Lopez-Requena Natalia Mora Thomas Voets Rudi Vennekens Bassem A Hassan Karel Talaverar Fonds Wetenschappelijk Onderzoek G.0565.07 Alessia Soldano Yeranddy A Alpizar Brett Boonen Alejandro Lopez-Requena Natalia Mora Thomas Voets Rudi Vennekens Bassem A Hassan Karel Talaverar KU Leuven GOA/14/011 Alessia Soldano Yeranddy A Alpizar Brett Boonen Luis Franco Alejandro Lopez-Requena Guangda Liu Natalia Mora Emre Yaksi Thomas Voets Rudi Vennekens Bassem A Hassan Karel Talaverar European Commission IUAP P7/13 Alessia Soldano Yeranddy A Alpizar Brett Boonen Luis Franco Alejandro Lopez-Requena Guangda Liu Natalia Mora Emre Yaksi Thomas Voets Rudi Vennekensr KU Leuven OT/12/091 Alessia Soldano Yeranddy A Alpizar Brett Boonen Luis Franco Alejandro Lopez-Requena Guangda Liu Natalia Mora Emre Yaksi Thomas Voets Rudi Vennekens Bassem A Hassan Karel Talaverar KU Leuven PF-TRPLe Alessia Soldano Yeranddy A Alpizar Brett Boonen Luis Franco Alejandro Lopez-Requena Guangda Liu Natalia Mora Emre Yaksi Thomas Voets Rudi Vennekens Bassem A Hassan Karel Talavera (Vlaams Instituut voor Biotechnologie, Fonds Wetenschappelijk Onderzoek|G.0702.12, Fonds Wetenschappelijk Onderzoek|G.0077.15, Fonds Wetenschappelijk Onderzoek|G.0680.10, Fonds Wetenschappelijk Onderzoek|G.0681.10, Fonds Wetenschappelijk Onderzoek|G.0503.12, Fonds Wetenschappelijk Onderzoek|G.0654.15, Fonds Wetenschappelijk Onderzoek|G.0761.10N, Fonds Wetenschappelijk Onderzoek|G.0596.12, KU Leuven|GOA/14/011, KU Leuven|OT/12/091, European Commission|IUAP P7/13, KU Leuven PF-TRPLe)status: Publishe
The Virtual Power Feedback: Enhancing the Transient Stability of Virtual Synchronous Generators Under Current Limitation
No full textThe Virtual Synchronous Generator (VSG) concept is a well-established control solution that facilitates the integration of power electronics-interfaced renewable sources into the electric grid. The VSG algorithm enables power converters to support the grid in case of voltage dips by injecting a large short-circuit current. However, a current limitation strategy must be implemented to address the hardware limitation of power converters. As demonstrated in the literature, the current constraint affects the VSG's dynamics by limiting the output power, thus causing a substantial acceleration of the virtual rotor and potentially leading to a loss of synchronism. Several available solutions utilize the measured actual active power as feedback, thereby modifying the VSG with complex control algorithms. On the other hand, this paper proposes a different approach, highlighting the benefits of using the virtual power instead of the measured power feedback for the most adopted limitation strategies available in the literature. This paradigm shift leads to a significant improvement in stability without requiring fault detection capability or switching the control structure, as demonstrated both theoretically and experimentally in this paper
Transient Stability Improvement of Virtual Synchronous Generators under Current Limitation: The Benefits of Virtual Power Feedback
No full textGrid-Following Virtual Synchronous Machines: a valid solution fulfilling the newest grid codes regarding the reactive grid support during faults
No full textSimple Active Damping Solution for Industrial Grid-Tied Inverters Using LCL Filters
No full textGrid-tied power inverters are typically interfaced with damped LC or LCL filters to limit the injection of switching harmonics. To minimize filter losses, the damping resistance of the filter is often reduced, resulting in poorly damped or unstable conditions at the resonant frequency. Therefore, different active damping solutions have been proposed in the literature to reduce passive elements while avoiding unstable conditions. However, most available solutions require additional current sensors or implement complex active damping algorithms. Moreover, the literature provides only partial guidelines to tune the active damping parameters. Therefore, this paper proposes a sensorless active damping solution based on a resonant current estimator and provides a straightforward tuning for its parameters. The proposed active damping method is experimentally tested on a three-phase, two-level 30 kVA inverter, thus demonstrating the validity of the presented approach
The Compensator Approach: Solving the Transient Stability Issues of Virtual Synchronous Machines
No full textThe continuous integration of renewable energy sources (RES) into the grid through power electronics impacts the power system stability, posing new challenges for control techniques implemented on power converters. The virtual synchronous machine (VSM) represents a viable power converter control solution for the RES integration, providing natural grid support capability resulting from the emulation of the synchronous machine behavior. However, the VSM control faces transient stability issues under large voltage sags due to the significant acceleration of the virtual rotor. The literature reports numerous transient stability analyses, proposing different control solutions to improve the transient response of virtual synchronous generators (VSGs). However, they increase the complexity of the control algorithm, requiring additional tuning. Furthermore, they often mitigate rather than eliminate the transient stability issues. Therefore, this article provides a new perspective on VSM implementation, proposing the virtual synchronous compensator (VSC) concept as a straightforward and definitive solution to eliminate the VSM’s transient instability. The VSC maintains its synchronism under large and prolonged voltage sags, overcoming the transient stability issues implied by conventional VSG algorithms without additional control modules. The VSC’s transient response is verified theoretically and experimentally, proving the claimed benefits
Social Network to analyse the relationship between ‘victim-author’ and ‘motivation’ of violence against women in Italy.
No full textThe paper aims to analyse the phenomenon of Violence against women in the Italian context during 2020. It proposes to study the relationship between ‘victim-author’ and ‘motivation’ in femicides committed in domestic environment. By means of the properties of the Social Network Analysis on bimodal data, the study detected main actors and motivations that generated the homicides with female victims. At the same time, the structural relationships allowed to investigate the existence of motivations that better characterized the action of the various actors. The bipartite graph visualization and centrality scores calculated have demonstrated the effectiveness of the methodology for the pursued objectives
Louis-Philippe Dalembert, «vagabond jusqu’au bout de la fatigue»
No full textThe Haitian novelist and poet Louis-Philippe Dalembert (Port-au-Prince, 1962) has developed in his works of fiction the concept of vagabondage as a literary projection of his biographical wandering through multiple spaces. The aim of this essay is to study the presence of vagabondage and its distinctive features in those novels written by Dalembert that reflect the writer’s perpetual motion: Le Crayon du bon Dieu n’a pas de gomme (1996), L’Autre face de la mer (1998), L’Île du bout des rêves (2003), Les dieux voyagent la nuit (2006). The main characters are constantly moving, they are cosmopolitan wanderers who belong to many places at the same time, just like Dalembert himself. By analyzing the representation of movement in these fictions, we will show that the notion of vagabondage is depicted by the author as a positive and meaningful opportunity for the vagabond who travels across countries, languages and cultures
Una ridiscussione dei concetti di home e identity nell’Asia globalizzata: il caso di These Foolish Things (2004) e How to Get Filthy Rich in Rising Asia (2013)
No full textThe evolution of postcolonial studies in the last thirty years and the development of a transnational approach in literary studies (Jay 2010) have led to a renewed interest towards the subaltern voices, especially in relation to the phenomena of migration and diaspora and their global effects. In this light, the idea of 'home' is characterized by a sort of porosity and by a new geographical and emotional conceptualization which inevitably influences the personal and collective identities of migrant communities.
The aim of the paper is to analyze these topics from a cultural and literary standpoint through the examination of the two different kinds of migrant flows and postcolonial scenarios depicted in These Foolish Things (2004) by the English author Deborah Moggach, and How to Get Filthy Rich in Rising Asia (2013) by the Pakistan novelist Mohsin Hamid. In these novels, the chaotic Indian framework – the former margin of the British empire – is torn between its colonial past and the current effects of the permeability of its borders. It is, therefore, a perfect global context, wherein the experiences and the feelings of the modern Indian identities are reinterpreted by the two authors
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