Search results for "C [POLY I]"
showing 10 items of 30703 documents
Kinetic of the Sewage Treatment: The Consumption of Organic Carbon of The Microalga Chlorella sp
2023
As well known, microalgae are eukaryotic or procaryotic microorganisms able to photosynthesize, namely transforming inorganic substrates and sun light into organic compounds and chemical energy. They result very promising in treating civil wastewaters thanks to their ability to employ nitrates and phosphates as nutrients (Lima et al., 2019). Autotrophic microalgae are, anyway, not useful in decreasing the organic carbon content of wastewaters, and for this reason, they cooperate with heterotrophic bacteria. The usefulness of microalgaebacteria consortia in treating wastewaters and the ratio of their inoculum was investigated in a previous work (Lima, 2022a). Contrarily to autotrophic microa…
Electrochemical treatment of real wastewater with low or high conductivity
2018
In the last years, many efforts have been devoted to the development of electrochemical processes for the effective treatment of wastewater contaminated by organic pollutants resistant to conventional biological processes and/or toxic for microorganisms [1–5]. It was shown that some electrochemical approaches, including the direct anodic oxidation at suitable anodes such as boron-doped diamond (BDD) and/or electro-Fenton (EF) at suitable operating conditions and cells [1–6] can allow to treat effectively a very large number of organic pollutants. However, most of the investigations were performed using synthetic wastewater. Hence, it is now mandatory to study the problems connected to the p…
Installazioni idrauliche nell’area sacra a Sud del tempio di Zeus Olympios ad Agrigento
2020
This paper will test the relationship between water and cult in the southern part of the sanctuary of Zeus Olympios at Agrigento. The most singular feature of this area is a monumental pool, besides some cisterns, buildings and a small oikos temple. The sacred area was investigated during the 20th century by E. Gabrici and E. De Miro and was referred to a chthonian cult, without deepening the features and modalities of ritual activities. Besides, it was not considered at all as a part of the sanctuary of Zeus, depending on the late chronology assigned to the main buildings. After having defined the character of the context through an analysis of the architectural remains, the votive and rit…
Natural and anthropogenic impacts on Greek karst water quality
2022
Water in stereoselective organocatalytic reactions
2009
In this review, recent advances in asymmetric organocatalytic reactions carried out with variable amounts of water, from substoichiometric to a large excess (reaction medium), are discussed. We also summarize several proposed mechanisms for the different possibilities of the action of water both in the increased activity of the catalyst and in the asymmetric induction. Finally, the application of this catalytic methodology to the enantioselective synthesis of valuable compounds through enamine or iminium catalysis is presented.
Rivelazione e Caratterizzazione di Consorzi Microbici in Reperti Lignei Sommersi
2009
In questa lavoro sono state affrontate le problematiche relative alla valutazione dello stato di conservazione del legno archeologico sommerso (waterlogged wood) in relazione ai fattori che ne inducono il degrado. L’attenzione è stata rivolta ai processi di biodeterioramento, indotti dall’attività di alcuni microrganismi che utilizzano le componenti principali del legno, la cui identificazione è stata eseguita ricorrendo a tecniche sia colturali sia molecolari. In particolare, le tecniche molecolari che si sono rivelate di immediata applicazione per lo studio e la caratterizzazione dei microrganismi che colonizzano i beni di interesse storico artistico e i manufatti d’interesse archeologico…
SEAty_ living beyond the waterfront dynamics outcomes and risk of a new trend
2011
The growing number of projcts for floating structures or artificial islands in response to the problems of urhan congestion or environmental emergency requires a critical reflection on the prospectives and the risks implied in this new trend of urban water colonization. This paper intends to test the hypothesis thaht the value of a new and emerging issue of Architecrure can be recognized to this trend and, trhrough a comparison with a series of experiences, wants to bring to the attention of the debate a number of questions which, for exigency of synthesis, analyze in particular the morpholinguistic issues re1ated to the diffusion of this new architecture theme.
Una más de la familia. Au pairs atrapadas entre el capital humano y la economía moral
2018
In contemporary societies we are witnessing an expansion of the messages of human capital. These messages have as their central dimension idea of the self-entrepreneur, which implies a deepening in the logic of activation, while blurring the wage relations. In this scenario, young people with university degrees are becoming a favourite target in the offensive of human capital. The penetration of these human capital messages can be seen in the discourses of young university students who have been forced to leave the country during the crisis. In the present text we approach the discourses of young women who came out as au pairs. The characteristics of this figure place it in a space halfway …
The Effect of Electrolytic Solution Composition on the Structure, Corrosion, and Wear Resistance of PEO Coatings on AZ31 Magnesium Alloy
2020
Plasma electrolytic oxidation coatings were prepared in aluminate, phosphate, and silicate-based electrolytic solutions using a soft-sparking regime in a multi-frequency stepped process to compare the structure, corrosion, and wear characteristics of the obtained coatings on AZ31 magnesium alloy. The XRD results indicated that all coatings consist of MgO and MgF2, while specific products such as Mg2SiO4, MgSiO3, Mg2P2O7, and MgAl2O4 were also present in specimens based on the selected solution. Surface morphology of the obtained coatings was strongly affected by the electrolyte composition. Aluminate-containing coating showed volcano-like, nodular particles and craters distributed over the …
Synergistic effect of W incorporation and pulsed current mode on wear and tribocorrosion resistance of coatings grown by plasma electrolytic oxidatio…
2019
Ceramic coatings were grown by plasma electrolytic oxidation on 7075 Al alloy using unipolar and bipolar pulsed current waveforms with 20 and 40% cathodic duty cycles, from a silicate-based bath without and with the addition of Na2WO4. Pancake-like morphology was dominant on the coatings grown by unipolar waveform, while the bipolar waveforms promoted volcano-like morphology, increased the roughness of the coating surface and the formation of more compact layers. The coatings produced using the bipolar waveforms provided higher resistances toward both tribocorrosion and dry sliding conditions, while further improvement was achieved by the presence of tungsten. The coatings produced in tungs…