1,721,114 research outputs found
Temperature Mapping of a Heterogeneous Combustion Chamber by Infrared Thermographic Image Processing
No full textOrlando, US
Analytical and numerical DDA analysis on the collapse mode of circular masonry arches
Full text linkThe purely-rotational collapse mode of circular masonry arches is investigated, through the guideline of new analytical solutions, by a Discontinuous Deformation Analysis (DDA) numerical tool. The so-called
Couplet–Heyman problem, of finding the minimum thickness of a circular masonry arch with general angle of embrace standing under self-weight, is addressed, both analytically and numerically. The main scope of the study is assessing the validity of different analytical solutions that can be derived for the problem. Starting from classical Heyman’s solution, different recently-found solutions based on the true line of thrust (locus of pressure points) are first independently re-derived. Then, multiple experiments on
discretised arches are performed, which show that the numerical results are in very good agreement with theory
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
Analysis of the palatal rugae following Rapid Maxillary Expansion (RME) by using a 3D-3D superimposition procedure
No full textA sample of 38 Italian subjects (17 males and 21 females, mean age 8.2 ± 1.2 years, age range 7.2–8.8 years), who underwent active Rapid Maxillary Expansion (RME), was studied to assess the reliability of an intraoral scan and the stability of palatal rugae. An intraoral scanner was used to obtain digital dental models pre- and post-treatment. A 3D-3D superimposition procedure was performed, and the Root Mean Square (RMS) of the distance calculated, to verify the forensic validity of this biometric technique. The Intra-Class Correlation Coefficient (ICC) values for the overall inter- and intra-observer agreement were 0.955 (95% CI: 0.931–0.980; p < 0.001) and 0.936 (95% CI: 0.918–0.975; p < 0.001), respectively. The values for TEM and rTEM tests were 0.423 and 1.2% for intra-observer; 0.637 and 1.7% for inter-observer. Results showed a statistically significant difference in RMS mean point-to-point distance between untreated control and treated subjects (p = 0.002). The RMS values to distinguish the pooled group (untreated and treated with RME) from any mismatch ranged from 0.42 to 0.61. This methodology was highly suitable to detect changes caused by RME. Since some modifications were detected, caution is necessary when palatal rugae are analysed for forensic purposes in subjects who underwent RME
Endocannabinoid-Epigenetic Cross-Talk: A Bridge toward Stress Coping
Full text linkThere is no argument with regard to the physical and psychological stress-related nature of neuropsychiatric disorders. Yet, the mechanisms that facilitate disease onset starting from molecular stress responses are elusive. Environmental stress challenges individuals' equilibrium, enhancing homeostatic request in the attempt to steer down arousal-instrumental molecular pathways that underlie hypervigilance and anxiety. A relevant homeostatic pathway is the endocannabinoid system (ECS). In this review, we summarize recent discoveries unambiguously listing ECS as a stress coping mechanism. As stress evokes huge excitatory responses in emotional-relevant limbic areas, the ECS limits glutamate release via 2-arachydonilglycerol (2-AG) stress-induced synthesis and retrograde cannabinoid 1 (CB1)-receptor activation at the synapse. However, ECS shows intrinsic vulnerability as 2-AG overstimulation by chronic stress rapidly leads to CB1-receptor desensitization. In this review, we emphasize the protective role of 2-AG in stress-response termination and stress resiliency. Interestingly, we discuss ECS regulation with a further nuclear homeostatic system whose nature is exquisitely epigenetic, orchestrated by Lysine Specific Demethylase 1. We here emphasize a remarkable example of stress-coping network where transcriptional homeostasis subserves synaptic and behavioral adaptation, aiming at reducing psychiatric effects of traumatic experiences
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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