1,721,012 research outputs found
Correlazioni fra le cause di esclusione e patologie riscontrate all'esame anatomoistopatologico in broilers oggetto di scarto sanitario al macello.
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GHG emissions in industrial activities: The role of technologies for their management and reduction
Full text linkTo deal with the problem of the Climate System Change and the Global Warming, countries as well industries require to decrease the amount of CO2 emissions released globally by developing greener technologies and improving the use of renewable energies. The role of the research, in particular process engineering, is to develop and demonstrate technologies in order to protect the world from the current deterioration situation, which could potentially develop more frequent natural disasters, raising in the sea level and cause harm to the human health and ecosystems. The Chemical Engineering group at Department of Civil and Industrial Engineering of Pisa University has been involved in several projects concerning carbon reduction and emission from energy production in different Sectors, in collaboration with public and private organizations and international networks. The research topics have been briefly reviewed and objectives for further studies have been identified
Investigation of Myriophyllum Aquaticum HTC: Reaction Pathways & Compound Identification
No full textHydrothermal Carbonization (HTC) represents a promising green technology for converting various biomass feedstocks into valuable hydrochar and liquid products. In this study, the HTC process of Myriophyllum aquaticum Verd., highly diffused in Tuscany (Italy), was investigated varying the process temperatures and the holding times. Indeed, it is one of the world's most troublesome invasive aquatic weeds, impacting not only the quality of water but also contributing to habitat deterioration; therefore, several management practices are required to address the problem. This research focused on obtaining preliminary experimental data to be further implemented in a lumped kinetic model to elucidate the reaction pathways leading to the formation of primary hydrochar and liquid compounds responsible for secondary hydrochar production. To figure out the HTC liquid phase composition and the organic compounds responsible for secondary hydrochar formation, the High-Performance Liquid Chromatography (HPLC) analytical technique was employed. This technique allowed to identify and quantify some of key chemical components present in the HTC liquid phase, i.e., sugars and furans. Moreover, the future integration of a lumped kinetic model and advanced analytical techniques not only will enhance the understanding of the Myriophyllum aquaticum HTC process but will also provide valuable insights into the optimization of HTC conditions for biomass conversion and resource recovery
Different scale experimental techniques to approach the problem of substances generated in the loss of control of chemical systems: a study on ethyldiazoacetate decomposition products
No full textA user-centered approach to artificial sensory substitution for blind People assistance"egalitarian" approach for special users
No full textArtificial sensory substitution plays a crucial role in different domains, including prosthetics, rehabilitation and assistive technologies. The sense of touch has historically represented the ideal candidate to convey information on the external environment, both contact-related and visual, when the natural action-perception loop is broken or not available. This is particularly true for blind people assistance, in which touch elicitation has been used to make content perceivable (e.g. Braille text or graphical reproduction), or to deliver informative cues for navigation. However, despite the significant technological advancements for what concerns both devices for touch-mediated access to alphanumeric stimuli, and technology- enabled haptic navigation supports, the majority of the pro- posed solutions has met with scarce acceptance in end users community. Main reason for this, in our opinion, is the poor involvement of the blind people in the design process. In this work, we report on a user-centric approach that we successfully applied for haptics- enabled systems for blind people assistance, whose engineering and validation have received significant inputs from the visually-impaired people. We also present an application of our approach to the design of a single-cell refreshable Braille device and to the development of a wearable haptic system for indoor navigation. After a summary of our previous results, we critically discuss next avenues and propose novel solutions for touch-mediated delivery of information for navigation, whose implementation has been totally driven by the feedback collected from real end-users
Experimental and numerical performance assessment of green-hydrogen production from biomass oxy-steam gasification
Full text linkThe production of hydrogen from residual biomass represents a sustainable alternative to integrate the production of renewable hydrogen in coming years. This work shows the results obtained during an experimental campaign dedicated to analysing the performance of a downdraft gasifier of about 100 kWt fed with woody biomass and oxy-steam mixtures. With suitable oxygen-steam ratios it was possible to produce a syngas with a hydrogen content higher than 40%vol, with a cold gas efficiency of more than 80%. The experimental syngas composition is used as input of a numerical model, created in Aspen Plus® and dedicated to evaluating the performance of the plant section for the pure H2-production. The numerical analysis highlighted the possibility of obtaining approximately 5% by mass of hydrogen with respect to the biomass used, also evidencing how the correct use of thermal waste and residues makes the whole plant (gasifier plus hydrogenizer) independent on heat supply
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