Search results for "Materiali"
showing 10 items of 876 documents
Introduction: classroom discourse at the intersection of language education and materiality
2021
This special issue provides a collection of research that examines the relationships between classroom materials and discourse in various second language education contexts. Together, these studies...
Art and Science in Word and Image
2019
Art and Science in Word and Image investigates the theme of ‘riddles of form’, exploring how discovery and innovation have functioned inter-dependently between art, literature and the sciences. Using the impact of evolutionary biologist D’Arcy Thompson’s On Growth and Form on Modernist practices as springboard into the theme, contributors consider engagements with mysteries of natural form in painting, photography, fiction, etc., as well as theories about cosmic forces, and other fields of knowledge and enquiry. Hence the collection also deals with topics including cultural inscriptions of gardens and landscapes, deconstructions of received history through word and image artworks and texts,…
Die Objektivierung der Dinge.Wissenspraktiken im mathematisch-naturwissenschaftlichen Schulunterricht / Objectifying Things. Epistemic Practices in S…
2015
Zusammenfassung Auf Grundlage ethnografischer Daten beschäftigt sich der Aufsatz mit Experimenten und Anschauungsobjekten im mathematisch-naturwissenschaftlichen Schulunterricht der Sekundarstufe. Die Unterrichtsteilnehmer transformieren dabei vieldeutige Dinge in eindeutige und von ihnen als unabhängig gefasste Objekte. Diese Objektivierung der Dinge erfolgt im Schulunterricht in drei Phasen: Nach der Vorbereitung im schulischen Archiv werden die Dinge bei der Durchführung von Experimenten im Unterrichtsraum in Aktion versetzt und schließlich in die sprachliche bzw. schriftliche Form an der Tafel und in den Heften überführt. Diese praktische Transformationsleistung ist durch eine asymmetri…
The Nature of Our Becoming: Genealogical Perspectives
2020
In the light of Philipp Sarasin's work in 'Darwin und Foucault: Genealogie und Geschichte im Zeitalter der Biologie', the article delineates a genealogically articulated naturally produced culture and a cultured nature and discusses the genealogical implications of a carnal, becoming self in a world that could rightly be justified "as an aesthetical phenomenon." The article demonstrates the historicity and processual materiality as a conceptual platform for a combination of the notions of experienced carnality and a socially constructed body, demonstrating such a historically embedded carnal body as a binding agent for the "social constructivist" and "biologist" approaches in sciences. Thus…
Thiophene pyrenyl derivatives for the supramolecular processability of single-walled carbon nanotubes in thin film heterojunction
2017
Abstract A major problem for the use of single-wall carbon nanotubes (SWCNTs) in electronic devices relates to their poor processability. Chemical modification inevitably introduces defects in the nanotube lattice, resulting in a loss of electronic properties. In this contest, we report on a supramolecular approach with the aim of increasing the dispersion of SWCNTs in solution and in organic semiconductor matrices by ensuring the optoelectronic properties. In particular, new pyrenyl derivatives of thiophene have been synthesized and used to improve the solubility of SWCNTs for electron transfer in thin film heterojunction with poly(3-hexylthiophene) (P3HT) as donor system. Photoinduced ele…
Structural performances of pultruded GFRP emergency structures – Part 1: Experimental characterization of materials and substructure
2019
Abstract This paper presents an experimental study in the field of structures made of pultruded fiber reinforced polymers (FRP) elements to be used for emergency purposes. A preliminary design of a 3D pultruded glass fiber reinforced polymer structure is presented with the mechanical characterization of the constituting elements. The axial and flexural properties of laminate and I-shaped GRFP profiles are discussed considering the short term creep. In a companion paper, the benefits, the limits and the reliability of the structure analyzed for emergency applications are discussed. In details, the numerical structural analysis of the full-scale 3D model is described followed by the experimen…
Effect of silane coupling treatment on the adhesion between polyamide and epoxy based composites reinforced with carbon fibers
2020
The increasing efforts aimed to design structures with reduced weight and better mechanical performances has led in recent years to a growing use of fiber reinforced polymer materials in several fields such as marine. However, these materials can be composed of chemically very different elements and, hence, may be difficult to joint. This research aims to improve the adhesion between a thermoplastic matrix of polyamide reinforced with short carbon fibers (PA12-CR) and a carbon fiber reinforced epoxy matrix (CFRP). Two different silane coupling agents, (3-Aminopropyl)trimethoxysilane (AM) and (3-Glycidyloxypropyl)trimethoxysilane (EP), were applied, through the spray deposition method, on th…
Effects of aging in salt spray conditions on flax and flax/basalt reinforced composites: Wettability and dynamic mechanical properties
2016
Abstract In the last years, the industrial policies are more attentive to issues concerning sustainability, recycling and environmental care. Therefore, the use of natural fibres in composite materials has spread more and more. This paper deals with flax and basalt fibres within an epoxy matrix by investigating the wettability and the dynamic mechanical properties of the resulting composites, subjected to long-term aging tests in critical environmental conditions. The first laminate was constituted by stacking ten layers of bidirectional flax fabrics. The second one was produced by replacing two external flax layers with two layers of basalt mat, for each side of the laminate. Both laminate…
Experimental design of the bearing performances of flax fiber reinforced epoxy composites by a failure map
2018
Abstract This paper represents the first effort aimed to the investigation of the pin/hole contact stress and failure mechanisms of epoxy composites reinforced with woven flax fabrics, underwent to tensile bearing tests. In particular, the maximum loads and failure modes are evaluated at varying the laminate geometrical configuration. In order to optimize the use of polymer composites reinforced with flax fibers in structural applications, an experimental failure map, identifying main failure modes of mechanically fastened joints, is obtained as function of hole diameter, distance of the hole from the free edge of the laminate and laminate width. Moreover, a theoretical approach based on th…
Mix design and mechanical performance of geopolymer binder for sustainable construction and building materials
2017
Sustainability in construction is a major concern worldwide, due to the huge volume of materials and energy consumed by this sector. Associated supplementing industries (e.g. Portland cement production) constitute a significant source of CO2 emissions and global warming. Valorisation and reuse of industrial wastes and by-products make geopolymers a solid and sustainable via to be followed as a valid alternative to Portland cement. In this work the mix design of a green fly ash-based geopolymer is evaluated as an environmentally friendly construction material. In the pursuit of sustainability, wastes from a regional kraft pulp industry are exploited for the material processing. Furthermore, …