1,721,036 research outputs found
Caratterizzazione meristica e genetica di Ciprinidi atipici presenti nel bacino spezzino del Magra-Vara
No full text"Meristic and genetic characterization in atypical Cyprinids from the Magra-Vara basin (Province of La Spezia, Italy)" - A mitochondrial gene and eight meristic features were investigated in five taxa of Cyprinids belonging to Leuciscinae subfamily. Research was carried out on: 1) atypical specimens collected from Magra-Vara basin; 2) specimens of Leuciscus cephalus, Leuciscus souffia and Rutilus rubilio collected from Magra-Vara basin; 3) specimens of the controversial taxon Leuciscus lucumonis collected from River Nestore, Province of Perugia, Italy. Results show that meristic features of the atypical cyprinid specimens are statistically similar to those found in “lucumonis” specimens. Genetic analysis seems to support morphological investigations but additional molecular data will be necessary to define levels of population variability and appropriate identification of the “lucumonis” taxon
Metabolite fingerprinting of Camptotheca acuminata and the HPLC-ESI-MS/MS analysis of camptothecin and related alkaloids.
No full textRelation between the microstructure and microchemistry in Ni-based superalloy
No full textNi-based superalloys with biphasic structure (γ + γ') are widely used for high-temperature
applications, such as disks and blades of gas turbines and aeronautical engines. For these
applications, the stability at high temperature is of the utmost importance, in particular the
coarsening and the morphological changes of γ' may be seriously detrimental for in-service
components. Evolution of γ' particles strongly depends on the composition difference between
disordered matrix and particles.
The present work is devoted to the investigation of the γ' morphology and the microchemistry in
single crystal CM186LC superalloy in as-received condition and after creep. The study was
carried out by SEM and AFM microscopies, standard XPS and Scanning Photoemission
Microscopy (SPEM) at the ELETTRA synchrotron facility in Trieste. The difference in the
chemical composition of two phases, γ and γ', was revealed from the SPEM images and their
spectral analysis. The structural evolution, taking place during creep and leading to rafting, seems
to be determined not only by the external applied stress but also by W diffusion from γ to γ’
phase
Relazioni tra polimorfismi molecolari, comportamento aggressivo e indici di ansia-depressione nel topo
No full text
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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