1,720,986 research outputs found
Conception et analyse mécanique de confinement des éléments cylindriques en béton à renforts mixte
No full text152 p. : ill. ; 30 cmNotre projet consiste en une expérience sur l'effet de l'oncorporation des ajouts minéraux dans le béton. Trois ajouts: le laitier granulé d'El Hadjar, lapouzzalone et le calcaire sont broyés en trois finesses (8500, 9500 et 11000 cm2/g) et incorporés dans le ciment avec différentes tenneurs (15%, 5%, 10%) respectivement, en substituant les fines argikeuses du sable, afin d'améliorer la stabilité chimique et les propriétés physico-mécaniques du béton conservé dans quatre milieux de conservation (eau potable, cycle air-eau, eau séléniteuse et eau de mer
Effets des ajouts cimentaires ultrafins sur les propriétés Physico-Mécaniques et la durabilité des bétons
No full text152 p. : ill. ; 30 cmNotre projet consiste en une expérience sur l'effet de l'oncorporation des ajouts minéraux dans le béton. Trois ajouts: le laitier granulé d'El Hadjar, lapouzzalone et le calcaire sont broyés en trois finesses (8500, 9500 et 11000 cm2/g) et incorporés dans le ciment avec différentes tenneurs (15%, 5%, 10%) respectivement, en substituant les fines argikeuses du sable, afin d'améliorer la stabilité chimique et les propriétés physico-mécaniques du béton conservé dans quatre milieux de conservation (eau potable, cycle air-eau, eau séléniteuse et eau de mer
Conception et analyse mécanique de confinement des éléments cylindriques en béton à renforts mixte
No full text152 p. : ill. ; 30 cmNotre projet consiste en une expérience sur l'effet de l'oncorporation des ajouts minéraux dans le béton. Trois ajouts: le laitier granulé d'El Hadjar, lapouzzalone et le calcaire sont broyés en trois finesses (8500, 9500 et 11000 cm2/g) et incorporés dans le ciment avec différentes tenneurs (15%, 5%, 10%) respectivement, en substituant les fines argikeuses du sable, afin d'améliorer la stabilité chimique et les propriétés physico-mécaniques du béton conservé dans quatre milieux de conservation (eau potable, cycle air-eau, eau séléniteuse et eau de mer
Effets des ajouts cimentaires ultrafins sur les propriétés Physico-Mécaniques et la durabilité des bétons
No full text152 p. : ill. ; 30 cmNotre projet consiste en une expérience sur l'effet de l'oncorporation des ajouts minéraux dans le béton. Trois ajouts: le laitier granulé d'El Hadjar, lapouzzalone et le calcaire sont broyés en trois finesses (8500, 9500 et 11000 cm2/g) et incorporés dans le ciment avec différentes tenneurs (15%, 5%, 10%) respectivement, en substituant les fines argikeuses du sable, afin d'améliorer la stabilité chimique et les propriétés physico-mécaniques du béton conservé dans quatre milieux de conservation (eau potable, cycle air-eau, eau séléniteuse et eau de mer
Potential use of recycled cork as aggregates for lightweight self-compacting concrete production
Get PDFThis work questions the possibility of using expanded black cork aggregates (EBCA), for the production of lightweight self-compacting concrete. Five concrete mixtures were tested: concrete made entirely with natural aggregate as a control concrete and four concrete mixtures made with cork recycled aggregate (5, 25, 50 and 75% replacement in volume of natural aggregate). The estimation of the success of the formulations was judged by studying the properties of concrete in the fresh state by the slump flow, T500, L-box and the sieve stability tests. In the hardened state, the properties of the concrete produced have been determined by compressive and flexural strengths and bulk density tests. The experimental results showed that as the replacement level of natural aggregates by EBCA increased, the flowability of the concrete decreased. However, a good flowability was obtained for concrete mixtures containing EBCA until 50%, satisfying the recommendations of self-compacting concrete given by EFNARC 2002. The obtained results indicate the possible use of EBCA for the production of lightweight self-compacting concrete, the replacement of 50% of natural aggregates by EBCA allows obtaining a formulation which corresponds to a lightweight self-compacting concrete with a density of 1750kg/m3 and a compressive strength of 8MPa
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Comportament flexibil forfecare a grinzilor de beton armat Întărit de diverse rețele de composite încorporate
No full textThis paper evaluate the flexural–shear behaviour of reinforced concrete beams
strengthening by embedded carbon fiber reinforced polymer grids (CFRP grids) and
metallic grids with hexagonal meshes, under four-point bending test. An experimental
investigation was carried out to evaluate the performance of this new technical of
strengthening, Three control beams and fifteen beams strengthened in flexural–shear
with different configurations have been tested. Several parameters were considered to
highlight the efficiency of the technical used, such as; ultimate load, ductility and failure
modes. The experimental results show that the beams strengthening by embedded carbon
and metallic grids offered a great improvement in strength, midspan deflection and
ductility index; in effect, an influence directly on the failure mode is observe
Variations on the Author
Get PDF“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
Get PDFWe 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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