1,721,001 research outputs found
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
Recycling technologies for fibre-reinforced plastic composite materials: A bibliometric analysis using a systematic approach
No full textFibre-reinforced plastic composite materials are increasingly employed in several industries. This extensive use has resulted in a huge increase of generated waste that has to be managed without causing significant environmental issues. Recycling fibre-reinforced plastic composite materials in accordance with circular economy principles might be a way to overcome such problems. Thus, this paper aims to empirically analyse the existing scientific literature regarding recycling technologies for fibre-reinforced plastic composite materials. The main goal is to provide a holistic and comprehensive analysis of the topic, as well as research gaps and future directions following a rigorous and transparent approach. Overall, 201 articles were selected through a systematic approach and then analysed using a bibliometric analysis. Results show that this topic has been increasingly gaining momentum in recent years and that researchers have mostly carried out experimental studies on chemical and thermal recycling technologies for recovering carbon fibres. Lastly, this article provides an in-depth research agenda based on identified research gaps and an enhanced managerial grasp of this field of research
Pseudomonas aeruginosa pneumoparotitis. Report of a case [Pneumoparotite da Pseudomonas aeruginosa. Descrizione di un caso.]
No full text[No abstract available
Recycling of waste fiber-reinforced plastic composites: A patent-based analysis
Full text linkFiber-reinforced plastic composite materials are increasingly used in many industrial applications, leading to an increase in the amount of waste that must be treated to avoid environmental problems. Currently, the scientific literature classifies existing recycling technologies into three macro-categories: mechanical, thermal, and chemical; however, none are identified as superior to the others. Therefore, scholars and companies struggle to understand where to focus their efforts. Patent analysis, by relying on quantitative data as a precursor to new technological developments, can contribute to fully grasping current applications of each recycling technology and provide in-sights about their future development perspectives. Based on these premises, this paper performs a patent technology roadmap to enhance knowledge about prior, current, and future use of the main recycling technologies. The results show that recycling macro-categories have different technology maturity levels and growth potentials. Specifically, mechanical recycling is the most mature, with the lowest growth potential, while thermal and chemical recycling are in their growth stage and present remarkable future opportunities. Moreover, the analysis depicts several perspectives for future development on recycling technologies applications within different industries and underline inter-and intra-category dependencies, thus providing valuable information for practitioners and both academic and non-academic backgrounds researchers interested in the topic
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
An innovative spinning process for production and characterisation of ring-spun hybrid yarns from recycled carbon fibre
Full text linkThe growing focus on sustainability stresses the importance of using materials derived from manufacturing scraps and end of life. Nowadays, a large amount of carbon fibre waste is available, and therefore, it is pivotal to understand how to use it for value-added applications. This paper introduces an innovative spinning process for ring-spun hybrid yarns composed of recycled carbon fibres (rCFs) from manufacturing scraps and virgin thermoplastic fibres in different blending ratios. The ultimate goal is to assess whether such a process is able to produce ring-spun hybrid yarns suitable for the production of polymer composites for structural applications and to determine the blends range that addresses this goal. The actual innovation in this process lies in the use of a ring-spinning machine for the production of hybrid yarns, which were characterised by tensile tests and thermogravimetric analysis combined with differential scanning calorimetry. The results show that the range of rCFs for the production of ring-spun hybrid yarns with good mechanical and thermal properties lies between 50% and 70%. Fibre orientation is crucial, especially for the card web, as is the blending ratio for the whole process. The increase in the number of draw frame doublings and the actual number of remaining rCFs have an impact on the tenacity of the hybrid yarn. Finally, ring-spun hybrid yarns consisting of 70% rCF exhibit slightly higher tensile strength, but with a lower decrease in the quantity of rCFs than those composed of 50% rCF. Thus, they possess the best mechanical and thermal properties and composites made from ring-spun hybrid yarns with 70% rCF should perform better. Overall, this process has the potential to be industrially transposed but needs to be evaluated from an environmental perspective
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