1,721,092 research outputs found
Intrinsic static strength of friction interfaces augmented with anaerobic adhesives
No full textThe paper is focused on the static strength of friction joints supplemented with anaerobic adhesives. Through torsional tests on the annular interface between tubular steel specimens, the friction and the adhesive contributions to the overall strength are determined as a function of the clamping force. The analysis shows no interaction of the component strengths, with the frictional strength proportional to and the adhesive strength independent of the clamping force as if the underlying mechanisms were acting separately. This cumulative performance, intrinsic of the interface in the homogeneous test conditions attained, should be exploited to the full when designing efficient real joints based on this hybrid technology
Cumulative static strength of tightened joints bonded with anaerobic adhesives
No full textThis paper deals with the static strength of mechanically tightened joints augmented with anaerobic adhesives. Tests were performed on a variety of specimens distinguished by fairly homogeneous (annular butt joint) or realistically inhomogeneous (threaded, cylindrical and double lap joints) working conditions over the bondline. For each geometry, the strength of the dry (unbonded) joint was compared with the strength of the joint bonded with an assortment of anaerobics. The results indicate that the strength of all joints (bonded and unbonded) increases with the contact force. When strong adhesives (retainers) are used, the overall strength approximately equals the sum of friction and adhesive strengths, taken separately. When weak adhesives (threadlockers) are adopted, the superimposition of effects grossly overestimates the measured strength. A micromechanical model is proposed that explains the observed macroscopic behaviour
La resistenza dei forzamenti incollati
No full textGli adesivi anaerobici sono impiegati da tempo nel settore industriale per potenziare le prestazioni dei collegamenti meccanici tradizionali. L'articolo prende in esame l'incremento di resistenza che essi apportano agli accoppiamenti per attrito in condizioni ideali di funzionamento. Attraverso prove di torsione su giunzioni anulari assortite, si determinano le quote di resistenza imputabili singolarmente all'attrito e all'adesivo per diverse pressioni di contatto. L'indagine rivela la sostanziale indipendenza dei due contributi simultanei. La componente d'attrito e quella adesiva risultano, rispettivamente, proporzionale e insensibile alla pressione, come se le due cause agissero separatamente. Il risultato costituisce un utile riferimento per il razionale proporzionamento dei giunti reali basati su questa tecnologia ibrida
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
Influence of the assembly process on the shear strength of shaft–hub hybrid joints
No full textInterference fitted and adhesively bonded joints, also known as hybrid joints, are an effective means to
increase the transferable load while reducing both the weight and the stress level of the joined
components. Many researches evaluated the strength of hybrid joints in dependence of several
variables, such as the assembly pressure level, the type of materials in contact, the curing methodology,
the operating temperature, and the loading type. To the authors’ best knowledge, no data are available
about the influence of the assembly technique on the shear strength of hybrid joints. This paper aims at
filling the gap, by comparing the shear strength of hybrid joints realized by ‘press fitting’, by ‘shrink
fitting’ and by ‘cryogenic fitting’
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
Dispelling 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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