1,721,003 research outputs found
PREMESSE PER UN METODO SEMPLIFICATO PER IL CALCOLO DELLA RISPOSTA DI STRUTTURE IN CASO DI INCENDIO
No full textThe protection of human life and the prevention of irreparable damages in case of fire have
become a compulsory requirement and a trend research topic. In strategic structures it is important
to limit deformations in order to guarantee the building serviceability also in case of
fire.
In this work the authors develop a procedure to estimate the deformations of a simple frame
subjected to fire. By means of the SAFIR code a nonlinear structural analysis has been considered
as a benchmark for structures under standard fire conditions. Hence, “effective temperatures”
have been determined imposing the equality of deformations obtained by linear
calculation and the ones obtained by SAFIR. The results show an acceptable error percentage
taking into account the coarse approximations involved in the procedure.
The “effective temperatures” method allows early assessments of the serviceability limit state
of complex structures partially subjected to fire
A Simplified Approach to Serviceability Assessment of Reinforced Concrete Structures in Fire
No full textIn case of fire the protection of human life and the prevention of irreparable damage
have become a mandatory requirement and an important research topic. In strategic
structures such as hospitals, civil defence and military buildings, it is important to
limit deformations in order to guarantee the building serviceability also in the case
of fire.
The aim of the work, described in this paper, is to estimate the deformations of some
structural elements (beams and columns) subjected to fire and to extend the results
to more complex structures. By means of the SAFIR code a nonlinear structural
analysis has been performed for simple reinforced concrete elements subject to
standard fire conditions. Hence, “effective temperatures” have been determined
imposing the equality of deformations obtained by linear calculation and the ones
obtained by SAFIR. Deflections and elongations obtained by “effective
temperatures” approach have been compared to the ones obtained by the nonlinear
SAFIR analysis. The results show an acceptable error percentage taking into account
the coarse approximations involved in the procedure.
The “effective temperatures” method allows early assessment of the serviceability
limit state of complex structures partially subjected to fire
Mitochondrial DNA sequence variation in the European sea bass, Dicentrarchus labrax L. (Serranidae): evidence of differential haplotype distribution in natural and farmed populations
No full textPCR and direct sequencing of 300 to 377-bp fragments of the cytochrome b mitochondrial gene were carried out in 40 specimens of European sea bass, Dicentrarchus labrax L., collected at different sites in the Mediterranean basin and representing wild and farmed populations. Sequence analysis revealed 6 transitional changes, which generated 5 different haplotypes (A-E). Only one mutation was nonsynonymous because it occurred in the first position of a codon leading to the replacement of valine by isoleucine. The genotypic distribution revealed that haplotype B was not present in the farm samples, whereas its frequency in the wild samples exceeded 30%. In contrast, haplotypes D and E were found in farmed populations but not in the wild populations. The comparison among wild populations showed a nonhomogeneous distribution of the two most frequent haplotypes, A and B
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
Assessment of optimal growth conditions for biomass and exopolysaccharides production in the thermotolerant cyanobacterium Phormidium sp. ETS-05
Full text linkPhormidium sp. ETS-05 is one of the target cyanobacteria species conferring anti-inflammatory properties to the therapeutic muds applied by spas of the Euganean Thermal District (Italy) to treat arthro-rheumatic pathologies. Beneficial mud is prepared by spas following a traditional method, called maturation, leading to the growth of a specific microbiota on natural raw clay irrigated by flowing thermal water at 37–47 °C for about two months. The effectiveness of the mud is related to heat, electrolytes and bioactive molecules synthesized by the microbiota. A clear role in the anti-inflammatory activity of muds has been demonstrated for the exopolysaccharides, EPS, produced by the entire microbiota and Phormidium sp. ETS-05.
Considering the interest in this species, we assessed its optimal growth conditions to obtain the higher EPS production in relation to temperature, light spectra, and intensity and nitrogen availability. The production of biomass and pigments was also taken into account, as other high-value compounds can be obtained in parallel with EPS. We found that exposure to a temperature of 45 °C under white light at 100 μmol photons m−2 s−1 is optimal to reach the highest biomass (1.13 g L−1) and an average production of 75 mg gDW−1 phycocyanin and of 150 mg gDW−1 EPS for Phormidium sp. ETS-05 cultured in lab-scale photobioreactors for 9 days. Putative genes linked with EPS assembly and export have also been identified in its genome, some of which have been investigated for their expression levels, opening up the possibility of biotechnologically boost EPS production
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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