1,720,994 research outputs found
Altamura P., Perotta A. C. (2023), “Stampa 3D in argilla e lolla di riso. Dall’architettura al design per la transizione ecologica | 3D printing in clay and rice husk. From architecture to design for the ecological transition”, in A.F.L. Baratta, Calcagnini L., Magarò A. (eds.), Atti del V Convegno Internazionale REcycling. Il valore della materia nella transizione ecologica del settore delle costruzioni, Anteferma Edizioni, Conegliano (TV), pp. 108-119 - ISBN: 979-12-5953-046-2.
No full textThe transition from a linear to a circular economy, oriented towards reuse, recycling and recovery, is an essential step within the ecological transition.
Designers, within a life cycle design approach, must consider how materials, as tangent physical elements and as limited resources, impact the planet. In a circular and material resource efficiency perspective, therefore, waste materials - especially those coming from bio-economy - represent a strategic investigation and experimentation field for both architecture and product design. This contribution illustrates the case study of an Italian company, Ricehouse, which has created a material for bio-architecture reusing waste of the rice cultivation with various innovative production techniques, including 3D printing. Starting from the experience of Ricehouse, using rice husk and clay for 3D printing in architecture, this study implemented an experimentation in the field of product design, with the objective of expanding the material’s application possibilities. From the point of view of Material Driven Design, the study started with the analysis of the properties, characteristics and technical performances of the material, in order to identify and explore its potential further uses. The results of this research
phase showed that indoor use of the material is possible, for the design of modular elements for furniture. Then the experimentation saw the development
of a conceptual and detailed design solution for a modular system printed in 3D and assemblable by the user, and therefore flexible and apt to modifications over time. The design project of the modular system Future research could investigate further data and technical specifications that characterize the material to verify its feasibility and explore further areas of application
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
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
Use of the extended one-pot (EOP) procedure for the preparation of ethynylated thiophene derivatives and related palladium-ethynylthiophene organometallic oligomers
No full textThe palladium-catalyzed coupling (Stille coupling) of 2,5-diiodothiophene (1) with tributyl(ethynyl)tin forms the 2,5-bis(ethynyl)thiophene (3) and tributyltin iodide as side product (step 1). Addition of lithium diisopropylamide (LDA) to this mixture causes deprotonation of the bis-alkyne and its reaction with the tin halide present in the medium to form the 2,5-bis[(tributyltin)ethynyl]thiophene (4) (step 2). To this mixture was subsequently added trans-dichlorobis(tri-n-butylphosphine)palladium (5), and the corresponding trans-bis(tri-n-butylphosphine)-mu- [2,5-bis(ethynyl)thiophene]palladium oligomer (6) was obtained (step 3). Alternatively, the same route can be directed toward the formation of ethynylated thiophene oligomers: after formation of the 2,5-bis[(tributyltin)ethynyl]thiophene (4) (step 2), addition of 2-iodothiophene (8) or 2-iodo-5-(trimethylsilyl)thiophene (10) led to the formation of 2,5-bis(2-thienylethynyl)thiophene (9) (step 3) and [2-trimethylsilyl(ethynyl)thiophene]-2,5-bisethynylthiophene (11) (step 3') respectively. The latter can be easily desilylated to obtain the [2-(ethynyl)thiophene]-2,5-bisethynylthiophene (13), while treatment of 9 with sec-BuLi/I-2 formed the 2,5-[2,2'-(5,5'-diiodo)bisthienyl]bisethynylthiophene (12). Through a sequence of transformations similar to steps 1-3, the oligo(iodo)ethynylthiophene 12 has been connected to the bis(tri-n-butylphosphine)palladium moiety to form the trans-bis(tri-n-butylphosphine)-,u-[2,2'-bis(ethynyl)thiophenel-2,5-bisethynylthiophene]palladium polymer (15). To compare the advantages of the above extended one-pot (EOP) procedures over classical routes, polymers 6 and 15 were also prepared by the copper-catalyzed reaction of trans-dichlorobis(tri-n-butylphosphine)palladium (5) with 2,5-bis(ethynyl)thiophene (3) and [2-(ethynyl)thiophene]-2,5-bisethynylthiophene (13)
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Use of the Extended One Pot (EOP) Procedure for the Preparation of Ethynylated Thiophene Derivatives and Related Palladium-Ethynylthiophene Organometallic Oligomers
No full textCritical issues hindering a widespread construction and demolition waste (CDW) recycling practice in EU countries and actions to undertake: The stakeholder's perspective
No full textConstruction and demolition waste (CDW) reuse and recycling represents a key point to enhance resource efficiency in construction sector and to reduce the huge volumes of extracted materials, energy consumption and waste production, which make this sector the largest resource consuming and waste producing one. Even if several alternatives for raw materials substitution have been widely investigated from a technical and economic point, several critical issues hinder a wide substitution rate of virgin raw materials with CDW valorised streams slowing down the circular economy transition. The aim of this research was to individuate and discuss these issues hindering a widespread CDW recycling practice in order to individuate actions to undertake, that can support policies and action plans. The investigation was conducted through desk research and a survey, through the administration of questionnaires and more focused guided interviews. Difficulties and barriers have been analysed and suggestions to improve waste recycling and reuse have been proposed. The state of implementation of policies, actions and best practices such as Green Public Procurement (GPP); b) End of Waste (EoW) criteria; c) pre-demolition audit; d) selective demolition; e) landfill tax; f) tax on raw material extraction; g) traceability system; h) take-back centres, have been examined and discussed. Finally, ideas and suggestions aimed at directing the correct implementation of policies, initiatives and action plans, starting from the successful experiences of some countries that could be effectively transferred in other ones and, trying to take advantage of the difficulties encountered in the implementation process, have been proposed
Hardware implementation of an echo-canceller for DVB-T on-channel repeaters
No full textThe necessity to obtain a better area coverage for services such as terrestrial digital television (DVB-T) is often obtained by using isofrequency channel repeaters. In this case the repeater receives at the input part of the transmitted signal and consequently an echo canceller is requested. The echo canceller is often based on a loop comprising a complex FIR filter with variable coefficients, that are calculated from the autocorrelation function of the received signal. In this paper, a hardware implementation of an Echo-canceller is presented. A board based on a Texas Instruments floating-point DSP and an Altera Cyclone II FPGA has been used for the final prototype. © 2007 IEEE
Environmental, social, and economic implications of critical raw materials’ extraction from residues
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