174 research outputs found
Investigating Sustainable Materials for AEM Electrolysers: Strategies to Improve the Cost and Environmental Impact
No full textIn recent years, the EU policy identified the hydrogen as one of the main energy vectors to support the power production from renewable sources. Coherently, electrolysis is suitable to convert energy in hydrogen with no carbon emission and high purity level. Among the electrolysis technologies, the anion exchange membrane (AEM) seems to be promising for the performance and the development potential at relatively high cost. In the present work, AEM electrolysers, and their technological bottlenecks, have been investigated, in comparison with other electrolysers’ technology such as alkaline water electrolysis and proton exchange membranes. Major efforts and improvements are investigated about innovative materials design and the corresponding novel approach as main focus of the present review. In particular, this work evaluated new materials design studies, to enhance membrane resistance due to working cycles at temperatures close to 80 °C in alkaline environment, avoiding the employment of toxic and expensive compounds, such as fluorinated polymers. Different strategies have been explored, as tailored membranes could be designed as, for example, the inclusion of inorganic nanoparticles or the employment of not-fluorinated copolymers could improve membranes resistance and limit their environmental impact and cost. The comparison among materials’ membrane is actually limited by differences in the environmental conditions in which tests have been conducted, thereafter, this work aims to derive reliable information useful to improve the AEM cell efficiency among long-term working periods
Developing Tailored Materials for the Industrial Production of Anion Exchange Membrane Electrolyzers through a Statistical Approach
No full textTecniche di Minimizzazione Gradualmente Non Convesse per il Restauro di Immagini Sfuocate
No full textIn questo rapporto viene presentata una tecnica GNC (Graduated Non-Convexity) per il restauro di immagini sfuocate. In particolare assumeremo che le immagini da ricostruire siano continue a tratti e che non si presentino discontinuità parallele. Per implementare la tecnica GNC viene determinata un'opportuna approssimazione convessa della funzione energia, e viene mostrato come la funzione energia approssimata ha già delle buone qualità di ricostruzione
Enhancing PEM Electrolyzer Performance through Electrochemical Impedance Spectroscopy: A Review
No full text
Post-Authenticity: The Collapse of Authentic Blackness in the Post-Soul Memoir
No full text“Oreo,” “white-black,” “Uncle Tom” or “sellout” are just a few of the derogatory terms used to refer to someone who is black but “acts white.” Today more than ever, blackness seems to be a slippery concept, and the proliferation of terms that denote someone who is “inauthentic” go hand in hand with discussions about the (in)authentic blackness of public figures. Although the general trend seems to be that of denying the validity of every notion of racial authenticity, this trend coexists with a need to define blackness, pin it down, establish boundaries, even if these boundaries are accepted as fluid and permeable. My dissertation focuses on an analysis of the notion of “authentic blackness” in African American contemporary memoirs, especially those that can be read as post-soul literature. Specifically, I base my definition of post-soul on the parameters established by Bertram Ashe in 2007, that is, I consider as “post-soul” texts that:
- have been written by authors who were born or came of age during or after the Civil Rights Movement and were raised in a multicultural, integrated environment
-stage what Ashe calls “blaxploration,” that is a desire to investigate, (re)define and de-essentialize blackness
-carry on blaxploration through the execution of “allusion-disruption gestures,” namely the author mentions tropes of traditional blackness, only to contradict them shortly after in order to show the untenable nature of their supposed authenticity.
My idea is that the memoir is a privileged genre to investigate authenticity, partly because of the long and complex history of the genre in African American literature, partly because memoirs reflect on what happens when blackness is embodied, and on the consequences of this embodiment in a racist and capitalist society. Aim of the project is to explore racial authenticity in the contemporary scene, keeping in mind how the concept has shifted over time and analyzing how it can be retraced in the production of contemporary African American memoirists. My main argument is that performances of racial identity emerge out of specific sociopolitical situations in which the performer operates, and that these performances are perceived as ineffective or at least insufficient as a tool of identity construction in the contemporary era, so that every notion of authentic blackness is seen as circumstantial, fluid, and ultimately untenable
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