9,056 research outputs found
Effect of Grinding on Chrysotile, Amosite and Crocidolite and Implications for Thermal Treatment
No full textNowadays, due to the adverse health effects associated with exposure to asbestos, its inertization is one of the most important issues of waste risk management. Based on the research line of mechano-chemical and thermal treatment of asbestos containing materials, the aim of this study was to examine the effects of dry grinding on the structure, temperature stability and fibre size of chrysotile from Balangero (Italy), as well as standard UICC (Union for International Cancer Control) amosite and standard UICC (Union for International Cancer Control) crocidolite. Dry grinding was accomplished in an eccentric vibration mill by varying the grinding time (30 s, 5 and 10 min). Results show a decrease in crystallinity, the formation of lattice defects and size reduction with progressive formation of agglomerates in the samples after the mechanical treatment. Transmission electron microscopy (TEM) results show that the final product obtained after 10 min of grinding is composed of non-crystalline particles and a minor residue of crystalline fibres that are not regulated because they do not meet the size criteria for a regulated fibre. Grinding results in a decrease of temperature and enthalpy of dehydroxylation (∆Hdehy) of chrysotile, amosite and crocidolite. This permits us to completely destroy these fibres in thermal inertization processes using a lower net thermal energy than that used for the raw samples
The effect of grinding on tremolite asbestos and anthophyllite asbestos
No full textThe six commercial asbestos minerals (chrysotile, fibrous actinolite, crocidolite, amosite, fibrous tremolite, and fibrous anthophyllite) are classified by the IARC as carcinogenic to humans. There are currently several lines of research dealing with the inertisation of asbestos minerals among which the dry grinding process has received considerable interest. The effects of dry grinding on tremolite asbestos and anthophyllite asbestos in eccentric vibration mills have not yet been investigated. Along the research line of the mechanical treatment of asbestos, the aim of this study was to evaluate the effects of dry grinding in eccentric vibration mills on the structure, temperature stability, and fibre dimensions of tremolite asbestos from Val d’Ala, (Italy) and UICC standard anthophyllite asbestos from Paakkila mine (Finland) by varying the grinding time (30 s, 5 min, and 10 min). After grinding for 30 s to 10 min, tremolite asbestos and anthophyllite asbestos showed a decrease in dehydroxylation and breakdown temperatures due to the increase in lattice strain and the decrease in crystallinity. Moreover, after grinding up to 10 min, tremolite and anthophyllite fibres were all below the limits defining a countable fibre according to WHO
Reestruturação do Projeto Gralha Azul
No full textRealização: UFPR TVReportagem: Andrea MacielEntrevistado: Carlos Moreira Junior, Reitor da UFPREntrevistado: Sérgio Luiz dos Santos, Coordenador do Projeto Gralha AzulEntrevistada: Daysa Fernanda Bloise, monitor
Reestruturação do Projeto Gralha Azul
No full textRealização: UFPR TVReportagem: Andrea MacielEntrevistado: Carlos Moreira Junior, Reitor da UFPREntrevistado: Sérgio Luiz dos Santos, Coordenador do Projeto Gralha AzulEntrevistada: Daysa Fernanda Bloise, monitor
Within-firm inequality in workdays and labor productivity. Evidence from linked employer–employee Italian data
No full textUsing a longitudinal dataset built merging survey and administrative datasets on Italian firms, we investigate the association between productivity growth and labor flexibility focusing on the role of inequality of yearly workdays within firms. In addition to a negative association between productivity growth and the share of fixed-term employment, we find a further negative association between this type of within-firm inequality and labor productivity growth. This finding suggests that higher inequality in workdays may weaken cooperation among workers, affecting productivity.Using a longitudinal dataset built merging survey and administrative datasets on Italian firms, we investigate the association between productivity growth and labour flexibility focusing on the role of inequality of yearly workdays within firms. In addition to a negative association between productivity growth and the share of fixed-term employment, we find a further negative association between this type of within-firm inequality and labour productivity growth. This finding suggests that higher inequality in workdays may weaken cooperation among workers, affecting productivity
Andrea Bacová
No full textAndrea Bacová focuses on research and teaching in the field of residential architecture. Her work includes systematic research on residential buildings and their urban context. She actively participates in promoting Slovak architecture and is the author of several publications and exhibitions
Viewer-, Author-, and Ownership in the Work of Andrea Zittel
No full textAndrea Zittel invites others to collapse the distinctions between artist, viewer, and collaborator by interacting with her usable works. This thesis explores the process of interacting with Zittel\u27s works, and how it affects viewer-, author- and ownership
Soil organic matter pattern in an olive orchard with different management practices for 21 years
No full textClimate change and resource depletion due to population growth emphasize the need for conservation-based agricultural practices to prevent soil degradation. Studying soil organic matter (SOM) dynamics across different land uses is essential for assessing soil health and guiding sustainable agriculture.
This study examined the physicochemical properties of soils from a Mediterranean olive orchard sustainably (Smng) and conventionally (Cmng) managed for 21 years. The focus was on SOM in aggregates at three depths (0-5, 5-15, 15-30 cm) and across three aggregate size classes (1-0.250, 0.250-0.063, <0.063 mm). Smng soils had higher total carbon (+50.7%) and nitrogen (+74.9%), as well as a greater aromatic OM component (+76.0%) in the 0-5 cm layer compared to Cmng soils, suggesting slower transport of organic matter into deeper layers. This effect was especially pronounced in micro-aggregates (<0.063 mm), with increases in carbon (+59.3%), nitrogen (+86.7%), and aromatic OM (+87.7%) in Smng soils, likely due to their ability to bind small colloidal particles. Smng soils also showed increased bacterial abundance and different accumulation of organic compounds from microbial fermentation, reflected in the OM’s qualitative profile. Soil tillage in Cmng caused mineral alterations, whereas Smng soils retained higher crystallinity. Examining the quality, stability, and interaction of SOM with mineral components, helps to understand its degradability and ecological behavior, which is crucial for mitigating climate change impacts and promoting land conservation. This study was carried out within the Agritech National Research Center and received funding from the European Union Next-GenerationEU (PIANO NAZIONALE DI RIPRESA E RESILIENZA (PNRR) – MISSIONE 4 COMPONENTE 2, INVESTIMENTO 1.4 – D.D. 1032 17/06/2022, CN00000022). This work reflects only the authors’ views and opinions, neither the European Union nor the European Commission can be considered responsible for them
Results from KLOE at DAFNE
No full textThe KLOE experiment at the Frascati φ factory, Daφne, has collected ~500 pb -1, i.e. 1.5 × 10^9 φ decays. At the φ factory it is possible to select pure KL and KS beams. Although the integrated luminosity is insufficient for precision tests of the CP, T symmetries in kaon decays, a wide number of topics in kaon and hadronic physics are accessible from the largest sample of φ decays at rest collected so far. The cross section σ(e+e- --> π+π-γ) below 1 GeV, relevant for the precise evaluation of the muon magnetic moment, has been measured with a statistical accuracy better than 1%. For the KS, we obtained the ratio of the branching fractions Γ(KS --> π+π-(γ))/Γ(KS --> π0π0) = (2.239 +/- 0.003stat +/- 0.015syst), fully inclusive of the ππγ final state. The analysis of the ~20,000 KS semileptonic decays KS --> πeν is being finalized providing precise measurements of both, the KS semileptonic branching ratio, and Re x+, i.e. the ΔS = ΔQ rule violation parameter. For the KL, we obtained the ratio Γ(KL --> γγ)/Γ(KL --> π0π0π0) = (2.80 +/- 0.02stat +/- 0.02syst) × 10-3, of interest to Chiral Perturbation Theory (ChPT), as well as preliminary results on the branching ratios to other decay modes. In particular, our measurements of the semileptonic decays of both, neutral, and charged kaons will improve the precision of the CKM matrix element |Vus|, clarifying the present disagreement between different experiments. The φ radiative decays, both in scalar and pseudo-scalar mesons, have been analyzed giving new measurements of the ɛ - ɛ' mixing angle, and of the φ --> a0(980)γ, φ --> f0(980)γ branching ratios
The Lettere of Andrea Calmo: authorial artifices and historical reality
No full textopenNonostante l’edizione di Vittorio Rossi del 1888, la raccolta di "ingegnosi cheribizzi" e di "fantastiche fantasie" di Andrea Calmo è ancora avvolta da un certo mistero. L’autore, dissimulando la propria identità dietro alla “maschera” dell’umile pescatore veneziano, è stato in grado di offrire uno spaccato della cultura e della società nella Venezia cinquecentesca.
In particolare, è il quarto libro delle Lettere ad aver suscitato maggiore interesse tra gli studiosi ed i lettori: pubblicato nel 1566, a diversi anni di distanza dai primi tre, questo libro si distingue per il fatto che tutte le epistole sono indirizzate a delle donne immaginarie o realmente esistite.
In questa sede si propone, in primo luogo, uno studio della biografia del Calmo accompagnata da un’analisi del contesto storico-culturale della Venezia cinquecentesca; in secondo luogo, invece, viene proposto un commento di alcune lettere dell’ultimo libro dell’opera calmiana, che cerchi di far luce principalmente sull’aspetto linguistico e contenutistico del testo.Despite Vittorio Rossi's 1888 edition, Andrea Calmo's collection of "ingegnosi cheribizzi" and "fantastiche fantasie" is still shrouded in a certain mystery. The author, dissimulating his own identity behind the "mask" of the humble Venetian fisherman, was able to offer a cross-section of culture and society in sixteenth-century Venice.
In particular, it is the fourth book of the Letters that has aroused greater interest among scholars and readers: published in 1566, several years after the first three, this book stands out for the fact that all the epistles are addressed to women imaginary or actually existed.
Here we propose, first of all, a study of Calmo's biography accompanied by an analysis of the historical-cultural context of sixteenth-century Venice; secondly, however, a commentary on some letters from the last book of Calmo's work is proposed, which seeks to shed light mainly on the linguistic and content aspect of the text
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