641 research outputs found
Un mercato dell'ultimo minuto
No full textgli sprechi alimentari caratterizzano i sistemi agroalimentari di tutti i paesi in via di sviluppo, compromettendo ancor di più il sistema nel quale viviamo. Qualcosa però può essere fatto e il progetto Last Minute Market ne è un esempio
Long term survival of mature autotransplanted teeth: A retrospective single center analysis
No full textObjective: The replacement of an irremediably compromised tooth requires an implant rehabilitation or a traditional fixed partial denture. In well-selected cases, a further therapeutic possibility is represented by tooth autotransplantation. Although dental transplants are poorly understood and practiced, the international literature agrees that it is considered the first choice when applicable. The advantages of this technique are numerous: use of an autologous element, maintenance of tissue trophism, aesthetic and functional restoration, costs reduction. Although autotransplantation is often performed with immature teeth, even mature teeth with fully formed apex can be used as donors. The aim of the present work was to analyze consecutive cases of completely formed donor teeth autotransplantations performed from 2005 to 2011 in 21 patients for evaluating the survival and success rate. Materials and methods: The medical records of patients who underwent transplantation in a specialized center in Rimini (Italy) from 2005 to 2011 were checked. Only transplants of mature donor molars were considered. Patients were called up to evaluate the survival rate and success rate. Results: The mean age at the time of the surgery was 33,6 ± 7,4; mean follow up was 11,9 years ±1,9. Success rate at the time of latest recall visit was 80 % and survival 95 % of the analyzed cases. Conclusions: The survival and success rate are in complete agreement with the most recent literature and confirm that the technique of autotransplantation is reliable when indications and protocols are rigidly followed, also using mature teeth as donors
Combining Symbolic and Genetic Techniques for Efficient Sequential Circuit Test Generation
No full textSymbolic and genetic techniques are combined in a new approach to sequential circuit test generation that uses circuit decomposition, rather than the algorithmic decomposition used in previous hybrid test generators. Symbolic techniques are used to generate test sequences for the control logic, and genetic algorithms are used to generate sequences for the datapath. The combined sequences provide higher fault coverages than those generated by existing deterministic and GA-based test generators, and execution times are significantly lower in many case
A village on the outskirts of the Ottoman empire: archaeological research at Tell Zeyd
No full textThis paper presents the most recent results from the research programme Zeyd Archaeological Project; launched in 2022, this project aims at exploring economy and society in the hinterland of the historical province of Mosul in the long Islamic period focusing on a highly representative site of the area, Tell Zeyd. Three seasons of archaeological research at the site have made it possible to put together a rich assemblage of data that illustrates settlement patterns and production at the village in the Ottoman period. This paper focuses on the evidence that emerged from the 2024 excavations, and, more specifically, on the occupation phases that can be ascribed to
the Early Ottoman period (Period E), datable to around the sixteenth century
School canteens and the food waste challenge: Which public initiatives can help?
No full textFoodservice is estimated to produce 12% of the total food waste in Europe, and it is a major target for policies against food waste. The amount of food lost during foodservice operations has been assessed in the literature as a figure ranging from 10% to 41% of the quantity prepared in the kitchen, either as non-served food or as plate waste. In this paper, a systematization of the current initiatives against food waste in EU school foodservice is provided. This background is used as a base to discuss the results of a direct assessment of food waste conducted in 78 primary schools in Italy, where 28.6% of the food prepared was not consumed by the diners. Part of it was saved for reuse, while the rest was disposed and treated as organic waste or, to a lesser extent, as unsorted waste. The flows of food waste, represented by a Sankey diagram, show that some actions may be implemented in order to save more food from disposal; for example, implementing donation programmes for non-served food or using doggy bags to avoid the disposal of plate waste. A greater effort shall be put on preventive actions, aimed at avoiding the generation of food waste; in this sense regular monitoring at schools may act as a first preventive measure as it can increase the awareness of students, teachers and foodservice staff over the issue of food waste
Expression of the 70 kDa Heat shock protein family in Alpine freshwater chironomids (Diptera, Chironomidae) under natural conditions
No full textChironomidae represent up to 100% of the fauna of Alpine streams. Because they survive stress conditions such as extremely lowtemperature (annual mean cold and expression of stress proteins such as the 70 kDa Heat shock protein family. Fourth instar larvae of ten species of coldstenothermalchironomids (Pseudodiamesa branickii, Diamesa latitarsis, D. laticauda, D. cinerella, D. insignipes, D. zernyi, D.vaillanti, Orthocladius (O.) frigidus, O. (Euorthocladius) thienemanni and Paratrichocladius nivalis) were collected in a glacier-fedstream in NE Italy at two stations (1300 and 2600 m a.s.l.) and in two seasons (summer 2005 and spring 2006). Immunodetectionand quantification of the relative levels of Hsp70 family were performed via Western blot analysis. Significantly different levels ofHsp70 were detected among species. The highest amounts were recorded in P. nivalis and D. insignipes, the lowest in P. branickii.Within the genus Diamesa, lower levels of Hsp70 were observed in the most cold-stenothermal species than in the less coldstenothermalones. These differences may be explained by different species autoecology. The results provide information onbiochemical strategies of alpine midges to face cold temperatures under natural conditions and new insights into their possibleresponse to global warming
Development of advanced silicon anode material for Li-ion and K-ion batteries
No full textRechargeable Li-ion technology is considered as the battery of choice for electric vehicles and large-scale smart grids thanks to its unrivaled electrochemical properties (1). However, important amelioration in battery performance are still required, particularly in terms of energy density, power delivery capabilities and cycle life. The search for new highly efficient electrode materials for energy storage is an ongoing challenge for both basic and industrial applications (2-4). Silicon (Si) with high theoretical capacity of 4200 mAh.g-1 is one of the most promising LIB anodes and a potential candidate to replace commercial graphite for applications such as EVs. To ensure implementation of silicon in practical applications, the cyclic performance of Si needs crucial improvements. Indeed, silicon particles demonstrate large volume expansion in subsequent cycles that causes the capacity fading due to electrode pulverization (5). This drawback can be avoided through the formation of Silicon/carbon composites in which the size of the silicon particles and their dispersion is well controlled.
In this work, the silicon-carbon composite particles in which silicon particles are intermixed with the conductive carbon network are prepared by spray drying as shaping method followed by a thermal treatment step under controller atmosphere (2, 6). The obtained composite demonstrates hollow spherical structure capable of withstanding and accommodate the expansion/shrinkage of Si upon lithiation/delithiation. The obtained Si/C anode material delivers a specific capacity of 1200 mAh.g-1, with capacity retention of 100% over long cycling performance of 1500 cycles which is more reliable as compared to other reported electrodes in the literature (6). We also show the primary results of the Si/C anode material for K-ion batteries (6).
References
1. A. Mahmoud, I. Saadoune, P.-E. Lippens, M. Chamas, R. Hakkou, J.M. Amarilla, Solid State Ionics, 300 (2017), pp. 175-181. https://doi.org/10.1016/j.ssi.2016.12.012.
2. B. Vertruyen, N.Eshraghi, C. Piffet, J. Bodart, A. Mahmoud, F. Boschini. Materials 11 (2018) 1076. https://doi.org/10.3390/ma11071076.
3. C. Karegeya, A. Mahmoud, R. Cloots, B. Vertruyen, F. Boschini, Electrochimica Acta 250 (2017) 49–58. https://doi.org/10.1016/j.electacta.2017.08.006
4. C. Karegeya, A. Mahmoud, F. Hatert, B. Vertruyen, R. Cloots, P-E. Lippens, F. Boschini. J. Power Sources 388 (2018) 57-64. https://doi.org/10.1016/j.jpowsour.2018.03.069
5. N. Eshraghi, L. Berardo, A. Schrijnemakers, V. Delaval, M. Shaibani, M. Majumder, R. Cloots, B. Vertruyen, F. Boschini and A. Mahmoud, ACS Sustain. Chem. Eng., 8, 15 (2020) 5868–5879. https://doi.org/10.1021/acssuschemeng.9b07434
6. N. Eshraghi, A. Mahmoud, F. Boschini, R. Cloots, EP Patent EP3654413 (2020).
ACKNOWLEDGMENTS
The authors are grateful to the University of Liège and FRS-FNRS for the financial support. Part of this work was supported by the Walloon Region under the “PE PlanMarshall2. vert”program (BATWAL 1318146). A.M. is grateful to the Walloon region for a Beware Fellowship Academia 2015-1,RESIBAT no. 1510399 and University of Liége
Why the waste? A large-scale study on the causes of food waste at school canteens
No full textSeveral studies have recalled the need to reduce food waste across all the stages of the food supply chain. To undertake effective intervention strategies for food waste prevention and reduction, it is important to better understand the main causes of this phenomenon. In this study, a wide range of factors potentially related to food waste generation in primary school canteens were analysed. The data was obtained from a large-scale study carried out involving 78 Italian primary schools, where the food waste occurring at lunchtime was measured on 11,518 diners, for a total of almost 110,000 meals. The assessment included the quantification of prepared food, plate leftovers and non-served food, which were all weighed with an electronic scale and measured separately for each meal course. The food rejected by diners and the quantity of food remaining unserved at the end of the lunch were studied against a set of potential factors, including the location and size of the school, the location of the kitchen, the type of menu provided to diners, the quantity of food prepared and served. Findings obtained through the analyses of the single variables show that most of the variables have a role in influencing the quantity of food that remains non-consumed. Multivariate models were used to assess the relative importance of the factors over the quantity of food waste. The foodservice provider emerges as the most significant factor in influencing the generation of food waste at schools; other relevant factors are the amount of food prepared and the serving size, the kitchen location, the food provided for the mid-morning break, the menu composition and the geographical area
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