1,721,068 research outputs found
Experimental and analytical study of random fatigue, in time and frequencies domain, on an industrial wheel
No full textIndustrial wheels are components subject to fatigue under a high number of stress cycles, depending on the type of vehicle they are installed to. The reliability of these components is strictly dependent on the accuracy of the fatigue validation method adopted. A common practice in the industry is to test loads under constant amplitude in laboratory through fatigue and test parameters according to the standards used in the industry. The object of this research is to compare the results in terms of damage and the number of failure cycles, adopting both the time domain and frequency domain approach on a real industrial component. Different theories were developed and applied to the real case of study of an industrial wheel, under specific load cases. Eventually, we applied different criteria to the numerical analysis. The added value of this study is the application of the fatigue criteria on a real industrial component, in order to check the reliability of the criteria. Eventually, we determined that the results show that, for these specific experimental load conditions, frequency-domain methods are a bit more conservative than time-domain methods
Aggression
No full textHuman aggression, violence and deviant behaviour are not only a great cost for society − up to $40.2 billion yearly only for England and Wales and 3.3% of the gross domestic product in America (Waters et al., 2004) − but have also great consequences for general health as they are among the world’s foremost causes of death (Krug, Dahlberg, Mercy, Zwi, & Lozano, 2002). Moreover, violence is often stated as a preventable public health problem (Gilligan, 1997). A search for literature on human aggression shows that different terms, such as aggression and violence, are frequently used interchangeably (Perry, 2001), although they actually differ in meaning. Therefore, the current chapter starts by defining the different concepts. Furthermore, the current chapter will further outline several subtypes of aggression and explain the concept of impulsivity in the context of aggression and forensic risk assessment. Thereby, several developmental theories of aggression will be presented. More specifically, theories emphasising biological, psychological and social origins of aggression will be reported. The chapter will finally describe some interventions for aggressive problem behaviour
Aggression
No full textHuman aggression, violence and deviant behaviour are not only a great cost for society − up to $40.2 billion yearly only for England and Wales and 3.3% of the gross domestic product in America (Waters et al., 2004) − but have also great consequences for general health as they are among the world’s foremost causes of death (Krug, Dahlberg, Mercy, Zwi, & Lozano, 2002). Moreover, violence is often stated as a preventable public health problem (Gilligan, 1997). A search for literature on human aggression shows that different terms, such as aggression and violence, are frequently used interchangeably (Perry, 2001), although they actually differ in meaning. Therefore, the current chapter starts by defining the different concepts. Furthermore, the current chapter will further outline several subtypes of aggression and explain the concept of impulsivity in the context of aggression and forensic risk assessment. Thereby, several developmental theories of aggression will be presented. More specifically, theories emphasising biological, psychological and social origins of aggression will be reported. The chapter will finally describe some interventions for aggressive problem behaviour
Annual papavers: taxonomically complex weeds
No full textThe taxonomic problems concerning annual papaver (Papaver rhoeas L.) have been discussed and new data of its populational polymorphism presented
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
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