1,721,136 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
Yeasts from ovine droppings: Isolation and characterization
No full textThree hundred-twenty five ovine droppings from 17 breeding stations in Tuscany (Italy) were examined to detect the presence of yeast. All fecal samples were drawn directly from the rectal ampulla of the animals and submitted to culture examination. One hundred thirty-two of 325 specimens (41%) scored positive, and 141 species were identified. Twenty-three isolates of Candida albicans, 18 of Rhodotorula glutinis, 17 of Cryptococcus humicolus, 16 of C. famata, 14 of C. kefyr, 12 of C. krusei, 8 of C. pelliculosa, 5 of C. guilliermondii, 4 of C. globosa, 4 of Rhodotorula rubra, 3 of C. parapsilosis, 3 of Saccharomyces cerevisiae, 2 of C. intermedia, 2 of C. tropicalis, 2 of C. lambica, 2 of Stephanoascus ciferrii, 2 of Zygosaccharomyces spp., 1 of C. lusitaniae, 1 of C. pulcherrima, 1 of C. laurentii and 1 of Pichia ohmeri were obtained. There was no evidence of C. neoformans. Fungi were recovered in 15 of 17 examined breeding stations with prevalences ranging from 0% to 92% (mean 41.2; sigma = 27.3). The results of this survey could suggest a role of sheep as carriers and reservoirs of potential zoonotic yeasts
A real-time implementation of a 3D binaural system based on HRIRs interpolation
No full textBinaural synthesis is a very important aspect in the field of immersive audio and it requires the knowledge of the head related impulse responses (HRIRs). This paper describes the real-time implementation of an impulse responses interpolation method that allows to obtain an accurate binaural reproduction reducing measurement sets. The method is based on the time decomposition and frequency division of the HRIRs and the application of a peak detection and matching procedure in combination with an alignment algorithm and a linear interpolation. A 3D set-up has been considered and the algorithm has been evaluated by means of objective and subjective tests, comparing it with the state of the art. The obtained results have demonstrated the excellent performance of the proposed system
Real Time Binaural Synthesis of Moving Sound Sources over Loudspeakers
No full textImmersive audio systems have been achieving increasing interest in the field of sound synthesis. These systems can reproduce enhanced perceived acoustic images, obtaining a better sound quality than the classical stereo reproduction. In this paper, a real time implementation of binaural reproduction over loudspeakers is proposed considering moving sound sources. The proposed system is based on an efficient 3D head related impulse responses (HRIRs) interpolation that allows to generate a moving sound source and a recursive algorithm for the crosstalk elimination to obtain a performing reproduction over loudspeakers. To achieve the HRIRs interpolation, the impulse responses are decomposed in time into early reflections and reverberant tail and the first part is then divided into two frequency bands. A peak detection and matching algorithm is reserved for the high-frequency part of the HRIRs and combined with an alignment algorithm before a linear interpolation. The other portions of the HRIRs are simply linearly interpolated and the resulting interpolated HRIR is obtained by the concatenation of early reflections and reverberant tail. Therefore, the input signal is filtered with the interpolated HRIRs and then a crosstalk elimination algorithm, called Recursive Ambiophonic Crosstalk Elimination (RACE), is applied. RACE allows to eliminate the crosstalk starting from the listener-loudspeaker distance, the distance between loudspeakers and the listener head radius and is based on an appropriate inversion, attenuation and delay of the undesired signal. The proposed system has been evaluated through several experimental tests that have confirmed its effectiveness in comparison with the state of the art
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
Valutazione dell'efficacia dell'enilconazolo nei confronti di miceli ed artrospore di dermatofiti
No full textReview on electric vehicles exterior noise generation and evaluation
No full textThe increasing worldwide adoption of Electric Vehicles promises to deliver a number of positive impacts, not only on the environment, but also on the quality of life of citizens in urban scenarios. However, the absence of exterior sound in Hybrid and Electrical Vehicles, especially at low speeds, may negatively affect pedestrian safety. While regulations mandate the adoption of Acoustic Vehicle Alert Systems, they also leave freedom to manufacturers and sound designers to find proper warning sounds, able not only to fulfill safety requirements but also to preserve the brand identity. This paper presents the most relevant initiatives around warning sound design, from the scientific state-of-art to the industrial implementations and R&D projects, taking into account the warning sound assessment methodologies imposed by regulations
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
- …
