1,720,959 research outputs found
Dimensionality Reduction of Sensorial Features by Principal Component Analysis for ANN Machine Learning in Tool Condition Monitoring of CFRP Drilling
No full text
Roughness of composite materials: characterization of hole quality in drilling of Al/CFRP stacks
No full textOptimal cutting parameters and tool geometry in drilling of CFRP/CFRP stack laminates for aeronautical applications
No full textDrilling stands out as the most widespread machining process of carbon fibre reinforced plastic (CFRP) composite parts, primarily in the aerospace industry due to the extensive use of mechanical assembly using fasteners such as rivets or bolts. In this paper, drilling of CFRP/CFRP stacks for aeronautical applications is investigated using two different types of drilling tools, a traditional twist drill and an innovative step drill, under different spindle speed and feed rate conditions to evaluate the optimal drilling parameters and the most suitable drill bit geometry for one-shot stack drilling. Automatic image processing is applied to evaluate the hole quality parameters and the relationship between tool wear and hole quality is studied for both tool types
Temperature measurements for the tool wear and hole quality assessment during drilling of CFRP/CFRP stacks
No full textCarbon Fiber Reinforced Polymer (CFRP) laminates are widely employed in the aerospace industry as they are lightweight materials with high mechanical strength. Drilling, that is the most common machining process for CFRP parts, may induce several types of defects in the laminates. This paper is aimed at the correlation of parameters representative of the hole quality and tool wear with data from thermographic analysis with the aim to investigate the possibility to assess the hole quality in real time, and to detect the need for tool replacement without physical measurements on the tool. The developed procedure is applied to the holes produced by two different geometry tools
Bio-Intelligent Selective Laser Melting System based on Convolutional Neural Networks for In-Process Fault Identification
No full text
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
- …
