On a Biobased Epoxy Vitrimer from a Cardanol Derivative Prepared by a Simple Thiol-Epoxy "Click" Reaction.

The development of this work lies in the relevant interest in epoxy resins, which, despite their wide use, do not meet the requirements for sustainable materials. Therefore, the proposed approach considers the need to develop environmentally friendly systems, in terms of both the starting material and the synthetic method applied as well as in terms of end-of-life. The above issues were taken into account by (i) using a monomer from renewable sources, (ii) promoting the formation of dynamic covalent bonds, allowing for material reprocessing, and (iii) evaluating the degradability of the material. Indeed, an epoxy derived from cardanol was used, which, for the first time, was applied in the development of a vitrimer system. The exploitation of a diboronic ester dithiol ([2,2'-(1,4-phenylene)-bis[4-mercaptan-1,3,2-dioxaborolane], DBEDT) as a cross-linker allowed the cross-linking reaction to be carried out without the use of solvents and catalysts through a thiol-epoxy "click" mechanism. The dynamicity of the network was demonstrated by gel fraction experiments and rheological and DMA measurements. In particular, the formation of a vitrimer was highlighted, characterized by low relaxation times (around 4 s at 70 °C) and an activation energy of ca. 48 kJ/mol. Moreover, the developed material, which is easily biodegradable in seawater, was found to show promising flame reaction behavior. Preliminary experiments demonstrated that, unlike an epoxy resin prepared from the same monomer and using a classical cross-linker, our boron-containing material exhibited no dripping under combustion conditions, a phenomenon that will allow this novel biobased system to be widely used.

Mapping do-it-yourself science.

The emergence of Do-It-Yourself (DIY) science movements is becoming a topic widely discussed in academia and policy, as well as by the general public and the media. While DIY approaches enjoy increasing diffusion even in official research, different social actors frequently talk about them in different ways and circumstances. Interaction and negotiation processes amongst actors (e.g. policy makers and DIY communities) define the premises upon which different conceptualisations of DIY science are deployed.In this paper we offer a framework for analysing the discourse on DIY science.Our study consists of a field research of three spaces active in DIY science premises, two dedicated events of the DIY community, and an auto-ethnography in the field of DIY biology.By relying on the theory of social worlds/arenas (SW/A), we collected data on how notions of DIY science are constructed by different social actors and how conceptual borders are built or are likely to shift, resulting in multiple possible SW/A mappings. We conclude that each and every conceptualisation of DIY science cannot stand independently from the situatedness of its multiple contexts, therefore making its usage in policy making and governance particularly complex.

Evolução e revolução: os geógrafos anarquistas Elisée Reclus e Pëtr Kropotkin e sua relação com a ciência moderna, séculos XIX e XX / Evolution and revolution: the anarchist geographers Elisée Reclus and Pëtr Kropotkin and their connection to modern science in the nineteenth and twentieth centuries

Resumo O texto analisa a construção de uma linha científica pelo grupo dos geógrafos anarquistas ativos entre os séculos XIX e XX, cujos representantes mais célebres foram Elisée Reclus e Pëtr Kropotkin. Os membros dessa rede eram ao mesmo tempo intelectuais e militantes, e a originalidade da sua elaboração científica destaca-se em relação à ciência da época. Interessados também em disciplinas como a sociologia, a antropologia e a pedagogia, utilizavam as ferramentas científicas das maiores correntes intelectuais do momento, como o positivismo, e sobretudo o evolucionismo, tentando levá-las a conclusões diferentes, que não justificassem as desigualdades sociais, mas, ao contrário, fossem úteis para a construção de uma sociedade mais justa.

Abstract This text examines the construction of a line of scientific thinking by a group of anarchist geographers who were active in the nineteenth and twentieth centuries, most famously represented by Elisée Reclus and Pëtr Kropotkin. The members of this network were simultaneously intellectuals and activists, and the originality of their scientific production stands out in comparison with the science of that time. They were also interested in disciplines such as sociology, anthropology, and pedagogy, and used the scientific tools from the leading intellectual trains of thought of that era (such as positivism and especially evolutionism) in an attempt to reach different conclusions that did not justify social inequalities, but rather could be used to construct a fairer society.

[Evolution and revolution: the anarchist geographers Elisée Reclus and Pëtr Kropotkin and their connection to modern science in the nineteenth and twentieth centuries]. / Evolução e revolução: os geógrafos anarquistas Elisée Reclus e Pëtr Kropotkin e sua relação com a ciência moderna, séculos XIX e XX.

This text examines the construction of a line of scientific thinking by a group of anarchist geographers who were active in the nineteenth and twentieth centuries, most famously represented by Elisée Reclus and Pëtr Kropotkin. The members of this network were simultaneously intellectuals and activists, and the originality of their scientific production stands out in comparison with the science of that time. They were also interested in disciplines such as sociology, anthropology, and pedagogy, and used the scientific tools from the leading intellectual trains of thought of that era (such as positivism and especially evolutionism) in an attempt to reach different conclusions that did not justify social inequalities, but rather could be used to construct a fairer society.

Trends in sensitivity analysis practice in the last decade.

The majority of published sensitivity analyses (SAs) are either local or one factor-at-a-time (OAT) analyses, relying on unjustified assumptions of model linearity and additivity. Global approaches to sensitivity analyses (GSA) which would obviate these shortcomings, are applied by a minority of researchers. By reviewing the academic literature on SA, we here present a bibliometric analysis of the trends of different SA practices in last decade. The review has been conducted both on some top ranking journals (Nature and Science) and through an extended analysis in the Elsevier's Scopus database of scientific publications. After correcting for the global growth in publications, the amount of papers performing a generic SA has notably increased over the last decade. Even if OAT is still the most largely used technique in SA, there is a clear increase in the use of GSA with preference respectively for regression and variance-based techniques. Even after adjusting for the growth of publications in the sole modelling field, to which SA and GSA normally apply, the trend is confirmed. Data about regions of origin and discipline are also briefly discussed. The results above are confirmed when zooming on the sole articles published in chemical modelling, a field historically proficient in the use of SA methods.