Search results for "recycling"
showing 10 items of 207 documents
On the projected increase of Sahel rainfall during the late rainy season
2016
Thirteen CMIP5 models are used to analyse changes in climate over the West African monsoon region between the near future (2031–2070 under the RCP4.5 emission scenario), and a control period (1960–1999 under the historical emission scenario), with a focus on the late rainy season. The monsoon circulation is projected to strengthen and to shift northward leading to more rainfall during the Sahelian season. The results show an increase of the Rainfall amounts in September–October and a delay in the monsoon withdrawal. The increased moisture that fuels the rainfall anomalies is associated with an increase in moisture flux convergence and with local moisture recycling. The moisture transport do…
Outlining the Limits of Friction Stir Consolidation as Used as an Aluminum Alloys Recycling Approach
2021
Friction stir consolidation (FSC) is a solid-state process that recycles metal scraps economically and eco-friendly compared to the conventional melting method. The process parameters especially processing time and rotational speed, have a crucial role in achieving a sound disc during FSC. The current study answers the research question of how far these process parameters can be effective when the mass of chips to be recycled increases. In specific, an experimental setup was analyzed that was previously identified as challenging for recycling 20 g chips of aluminum alloy AA 2024-O. Rotational speed was set doubled, and processing time was increased up to 1.5 times of their initial values. T…
Estetyka "re-" w Weselu na podstawie "Wesela" z Teatru im. Jana Kochanowskiego w Opolu
2016
The subject of the article is, modern in last decades, a creative way of parasitising on someone else‘s texts – a reinterpretation of texts which were written some time ago. As an example of such a modern drama strategy, called a literary recycling, I chose ―The Wedding‖ on the basis of Wyspianski‘s ―The Wedding‖ presented in Jan Kochanowski Theatre in Opole. The staging is a reinterpretation of a well-known drama of Jan Wyspianski which leads us to many reflections. How far can a director walk away from an original text, traditions, conventions, a spectator‘s habits? What kind of compromises can be discussed to, on the one hand, keep the part of original content, and on the other hand, pre…
Showing the Invisible: The Economic Cycle of Stone Tools
2023
This contribution takes place in a broader theme, that of “the invisible economy of recyclable materials”. It aims to illustrate the phenomena of recovery of materials from lithic tools and their consequences. The classification of tools by material, although classic, is not relevant from a technical point of view. The material of a tool, in particular its mechanical properties, is to be taken into consideration in its technical analysis, but it cannot constitute a determining criterion in a classification system. Function should come first, as most functional categories use multiple materials. The most striking example, if one can say so, is that of the striking supports, where one finds, …
Pierres et carrières : réflexions autour de différentes stratégies d’approvisionnement sur les chantiers bourguignons médiévaux
2021
In this paper, we want to discuss the complexity of the mechanisms of medieval building stone supplying based on a diachronically and multidisciplinary inquiry on several Cistercian and ducal study cases. The first results enlighten the constraint caused by land property that limits the builders to a supplying network shaped by domain and law. Thanks to the growing vitality of trade and the arrival of independent stone providers, criteria of selection gradually focus on stone itself. Both global and individual strategies evolve then, reinventing the networks of stone providing and the markets.
Investigating the Viability of Multi-Recycling of Asphalt Mixtures through a Preliminary Binder Level Characterization
2022
The incorporation of reclaimed asphalt (RA) in hot mix asphalt mixtures is widely considered a sustainable solution for road infrastructure development. Under the scope of the circular economy (CE), the multiple recycling capability of RA has to be assessed in order to ensure its performance at each recycling cycle and also its viability with different additives. The performance of asphalt mixtures with RA strongly depends on the type of rejuvenator, binder, and their degree of blending in the mix. For this reason, it is essential to know the properties of the aged binder extracted from RA to better understand its rheological properties and optimal dosage of rejuvenation to design a satisfa…
Toward the Decarbonization of Plastic: Monopolymer Blend of Virgin and Recycled Bio-Based, Biodegradable Polymer.
2022
Decarbonization of plastics is based on two main pillars: bio-based polymers and recycling. Mechanical recycling of biodegradable polymers could improve the social, economic and environmental impact of the use of these materials. In this regard, the aim of this study was to investigate whether concentrations of the same recycled biopolymer could significantly affect the rheological and mechanical properties of biodegradable monopolymer blends. Monopolymer blends are blends made of the same polymers, virgin and recycled. A sample of commercially available biodegradable blend was reprocessed in a single-screw extruder until two extrusion cycles were completed. These samples were exposed to gr…
Jyväskylän yliopiston ylioppilaskunnan hiili- ja luontojalanjälki
2023
Tässä hankkeessa laskettiin Jyväskylän yliopiston ylioppilaskunnan (JYY) merkittävimpien toimintojen vuoden 2021 hiili- ja luontojalanjälki eli ilmasto- ja luontohaitat. Menetelmä perustuu pääosin muun muassa EXIOBASE ja LC-IMPACT-tietokantoihin, joiden avulla pystytään talouskirjanpitoon perustuen selvittämään eri tuotteiden ja palveluiden aiheuttamat ilmasto- ja luontohaitat sekä niiden maantieteelliset sijainnit. JYY:n vuoden 2021 hiilijalanjälki oli 2017 t CO2e, maaekosysteemeihin kohdistuva luontojalanjälki oli 8,30E-09 PDF (globaali osuus lajeista, jotka ovat riskissä kuolla sukupuuttoon), makean veden ekosysteemeihin kohdistuva luontojalanjälki oli 1,42E-09 PDF ja meriekosysteemeihin…
Multi-layered, covalently supported ionic liquid phase (mlc-SILP) as highly cross-linked support for recyclable palladium catalysts for the suzuki re…
2011
The reaction between an excess of 1,4-bis(3-vinylimidazolium-1-yl) bromide and a mercaptopropyl-modified amorphous silica gel or ordered mesoporous silica SBA-15 in the presence of azobisisobutyronitrile (AIBN) afforded new materials, which have a high loading of imidazolium moieties. These materials, which contain a highly cross-linked polymeric network, have been denoted as multi-layered, covalently supported ionic liquid phase (mlc-SILP) and have been used as support for palladium catalysts containing a high loading of the metal (10 wt%). Such materials were characterized by several techniques (13C magic angle spinning nuclear magnetic resonance, the Brunauer–Emmett–Teller technique, sma…
Recycling of dry and wet polyamide 6
2002
Recycling of polycondensation polymers can give rise to secondary materials with good mechanical properties only if a careful drying is carried out before the melt reprocessing operations. The presence of humidity provokes the hydrolytic chain scission of the macromolecules and the consequent decrease of molecular weight and properties. In this work, the drying step was substituted by the addition of an antioxidant that is able to protect the macromolecules because it is the autioxidant is more prone to hydrolysis, thus removing the water from the melt. The mechanical properties of polyamide 6 reprocessed more times in wet conditions and in the presence of this stabilizer are even better th…