1,721,078 research outputs found
Biodegradable Polymer Coatings: Current State‐of‐the‐Art, Recent Advances, and Still Open Challenges
Full text linkPolymer coatings represent both a key academic research topic and a viable and well-established industry market. Their characteristics are unique and allow for their application on different types of substrates (such as metal alloys, ceramic materials, polymers, paper, and paperboard), even for uses characterized by high durability. The latter property is perhaps the one behind their extensive diffusion since it guarantees performance over a wide range of time, often comparable with the lifetime of the coated substrate. However, the durability of a coating is not always a desired and sought-after feature: in fact, there are applications for which the possibility to remove the coating on demand from the coated substrate becomes an extremely important goal, even in the logic of the circular economy. In this context, academic research is trying to develop and implement biodegradable polymer coatings, i.e., thin layers of material that may start interacting with the environment in specific conditions, breaking down into simple substances that do not exhibit toxicity or hazard. This work aims to review the current state-of-the-art related to biodegradable polymer coatings, providing the reader with an overview of the progress made so far in this research field and some perspectives for the coming years
Atteggiamenti mentali e stili di vita
No full textIntroduzione storiografica e metodologica alla parte del convegno dedicata agli apporti di Vito Fumagalli alla storia degli stili di vita e dell'immaginario sociale
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
Sensing soluble molecules through SERS substrates in one-step procedure: Unrevealing the Meiji woodblock printing materials
No full textUltrasensitive SERS substrates allowed us to detect complex mixtures of coloring components from Meiji Japanese woodblock prints (1868-1912). In museum settings, compositional analyses have limitations due to restrictions to sampling advised by conservators and curators for the adequate preservation of the objects. An additional layer of complexity is brought by the high heterogeneity of heritage materials, usually not resolved with commercial portable instruments. High-performance instruments for in situ analyses are seldom available in museums. Furthermore, the chambers of most instruments for morphological or chemical characterization accommodate small samples rather than large or medium-sized objects. The innovative sampling strategy herein proposed comprises the gentle touch-dry removal of small coloring molecules weakly bound to the surface of heritage objects, transferred through a silicone sampler to planar SERS substrates with selected solvents in a one-step procedure. The analytical protocol reduces the amount of sample necessary for reliable identification of color components down to nanograms. The selectivity of the solvents combined with the geometry of the planar SERS sensing devices produces reliable signals for molecular identification, with no need for incision or wetting of the printed material. Further, 3D Raman imaging allowed us to reach an unprecedented degree of molecular discrimination, advancing previously available minimally-invasive instrumental methods used in heritage science research. The validation with historical inks from Meiji woodblock prints led to the identification of soluble synthetic azo β-naphthols, barium sulfonic lakes, purple anilines, Prussian blue, glass arsenic sulfides and other traditional coloring media.This work was funded by the Xunta de Galicia (Centro Singular de Investigación de Galicia, accreditation 2019–2022, ED431G2019/03, Consolidación e estructuración ED431B 2021/23), and the European Regional Development Fund.Peer reviewe
Variations 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
- …
