1,721,005 research outputs found
L'Italia in Europa. Le politiche dei trasporti per rimanere in rete
No full textIl libro si pone come obiettivo lo stimolo all'attuazione di forti innovazioni nel settore dei trasporti in logica europeista da attuare in tempi brevi e con logiche non solo di politica industriale in grado di produrre effetti in direzione di una smart mobility inquadrata in un contesto di green economy, ma anche di politica economica ampia, data la capacità del settore di produrre effetti diretti, indiretti e indotti su molti altri ambiti economici e sociali
Assessing the inherent risk of substances: precursors of hazardous products in the in the loss of control of chemical systems
No full textFormation of hydrogen bromide and organobrominated compounds in the thermal degradation of electronic boards
No full textThe influence of the heating rate and of the presence of oxygen on the decomposition pathways and on the decomposition product yields obtained from the thermal degradation of electronic boards containing brominated flame retardants was investigated. TG-FTIR techniques and a fixed bed batch reactor coupled to different analytical techniques were used to simulate different thermal degradation conditions. The qualitative and quantitative yields of decomposition products at different heating rates and in different reaction environments were obtained and compared to those from the decomposition of the unlinked resin and of tetrabromobisphenol A. Bromine was mainly evolved in the gaseous fraction for all the materials and the experimental conditions considered, although significant quantities are present as well in the condensable fraction. An increase of bromine evolved as gaseous hydrogen bromide was evidenced at higher heating rates. In the presence of oxygen, PBDD and PBDF were detected among the decomposition products. The possible precursors and the likely radical reaction pathways leading to the formation of these compounds were identified on the basis of the experimental data. The results obtained confirm that the formation of highly hazardous organobrominated compounds may be expected from the combustion of electronic scrap and of materials containing brominated flame retardants. © 2006 Elsevier B.V. All rights reserved
Assessment of systematic errors in measurement of vapor pressures by thermogravimetric analysis
No full textThe present study explores the application of the diffusion limited evaporation theory to the estimation of vapor pressure from TG experimental data. A simplified method was developed to calculate the apparent values of the vapor pressure of pure substances from TG data, based on isothermal TG runs with crucibles having different surface areas available for evaporation. Antoine parameters are estimated through a numerical procedure based on a non-linear least square algorithm. The procedure also evaluates the substance diffusivity in nitrogen. The methodology developed might be used for a preliminary screening of the vapor pressure of pure compounds, due to the limited amounts of sample that are necessary and to the limited time frame required for the experimental runs. However, the estimation of diffusivity and vapor pressures values by the TG technique is possible with limited accuracy. Possible sources of error were thoroughly investigated and discussed. © 2007 Elsevier B.V. All rights reserved
Thermal degradation and decomposition products of electronic boards containing brominated flame retardants
No full text
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Assessing the inherent risk of substances: precursors of hazardous products in the in the loss of control of chemical systems
No full textVariations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Thermogravimetry as a screening tool for the estimation of the vapor pressures of pure compounds
No full textA simplified approach was developed to estimate the vapor pressure of pure compounds from experimental data obtained by isothermal thermogravimetric (TG) analysis. A numerical procedure was developed to estimate the Antoine parameters of the substance by the analysis of isothermal TG data. The results of the experimental validations carried out evidenced that at least a preliminary estimation of vapour pressures of pure substances by the analysis of TG data is possible. The limited time and the reduced amounts of sample required for the experimental runs make the technique attractive with respect to the conventional and more accurate techniques for vapor pressure assessment. © 2007 Springer Science+Business Media LLC
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