1,720,990 research outputs found
Analysis of debonding in bio-inspired interfaces obtained by additive manufacturing
Full text linkThe present work is focused on the analysis of fracture in adhesive bonded Double Cantilever Beam (DCB) specimens with 3D printed nylon substrates. The substrates were obtained using selective laser sintering of polyamide powder and embed sub-surface channels with circular and square cross-section. The proposed strategy allows to mimic the crack trapping effect already observed in a multitude of biological materials, that is originated by the spatial modulation of the driving force available for crack growth. Mechanical tests have shown that the channels induce load fluctuations in the global load-displacement response. A significant increase in the total dissipated energy was observed with respect to bulk samples, i.e. no channels. The observed fluctuations in the global response were associated to the sequential storage and sudden release of elastic energy. Indeed, the spatial modulation of the stiffness around the interfacial region ultimately affects the crack driving force
Innovative manufacturing process of functionalized PA2200 for reduced adhesion properties
Full text linkThis work proposes an approach to fabricate micro patterned surfaces on PA2200 polyamide in order to improve its performance in terms of wettability and adhesion. In more detail, the present work aims to change the wettability of the surface and decrease their bacteria adhesion tendency. The experimental procedure consists of imprinting a set of different micro patterned structures over the polymer in order to verify the effectiveness of the methodology to change the contact angle of the surface, and in turn, reduce the occurrence of bacteria adhesion. Four different surface patterning were produced by laser ablation of a commercially pure titanium alloy, and then imprinted over the polyamide by surface stamping. The resulting surfaces were analyzed by topographical characterization and scanning electron microscopy. The wettability was probed by contact angle measurements while the bacteria adhesion was analyzed by adhesion test. The experimental results demonstrate the effectiveness of the method to modify the surface characteristics and to obtain a reliable patterned surface without using chemical hazardous material; opening to the possibility to replicate more complex structures and to obtain graded engineering surfaces
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
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
Integrated Computer-Aided Innovation: The PROSIT approach
Full text linkThe paper presents a methodology aimed at the improvement of the product development cycle through
the integration of Computer-Aided Innovation (CAI) with Optimization and PLM systems. The
interoperability of these tools is obtained through the adoption of Optimization systems as a bridging
element between CAI and PLM systems. This methodology was developed within the PROSIT project
(http://www.kaemart.it/prosit).
The paper describes the main issues related to the integration of these complementary instruments
and the solutions proposed by the authors. More specifically, the main idea of the PROSIT project to link
CAI and Optimization systems is the adoption of the latter tools not just to generate optimized solutions,
but also as a design analysis tool, capable to outline critical aspects of a mechanical component in terms
of conflicting design requirements or parameters. CAI systems are then applied to overcome the
contradictory requirements. The second step, i.e. the integration between Optimization and PLM
systems, has been obtained through the development of Knowledge-Based (KB) tools to support
designer’s activities. More in details, they provide means to analyze and extrapolate useful geometrical
information from the results provided by the optimizer, as well as semi-automatic modelling features for
some specific geometries. A detailed example related to the design of a plastic wheel for light motoscooters
clarifies the whole procedure. The paper integrates, extends and updates topics presented in
Cugini et al., Barbieri et al. and Cascini et al. [U. Cugini, G. Cascini, M. Ugolotti, Enhancing interoperability
in the design process—the PROSIT approach, in: Proceedings of the 2nd IFIP Working Conference on
Computer-Aided Innovation, Brighton (MI), USA, October 8–9, 2007, published on Trends in Computer-
Aided Innovation, Springer, ISBN 978-0-387-75455-0, pp. 189–200; L. Barbieri, F. Bruno, M.
Muzzupappa, U. Cugini, Design automation tools as a support for knowledge management in topology
optimization, in: Proceedings of the ASME 2008 International Design Engineering Technical Conferences
& Computers and Information in Engineering Conference (IDETC/CIE 2008), Brooklyn, New York, USA,
August 3–6, 2008; L. Barbieri, F. Bruno, M. Muzzupappa, U. Cugini, Guidelines for an efficient integration
of topological optimization tools in the product development process, in: Third International Conference
on Design Computing and Cognition, Atlanta, USA, June 23–25, 2008; G. Cascini, P. Rissone, F. Rotini,
From design optimization systems to geometrical contradictions, in: Proceedings of the 7th ETRIA TRIZ
Future Conference, Frankfurt, Germany, November 6–8, 2007]
Some considerations on the precision of incrementally formed double-curvature sheet components
No full textDispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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