1,720,985 research outputs found
Sustainable conservation in a monumental cemetery,
No full textThe 'Foce' monumental cemetery in Sanremo (Ligury, Italy), founded in 1838 and used until 1948, was central in a study that the Author carried out since January 2013: it is a site rich in stone artefacts and seriously deteriorated due to the absence of a plan for weed control and conservation, the lack of heirs and the marine environment. In this study, the attention is especially focused on the sustainable conservation: the paper describes the specific-drawn maintenance plan for the conservation of the site, it also underlines the importance of using products and techniques with a low environmental impact and finally, it briefly presents the possibilities of socio-economic sustainability of valorisation and management considering the cemetery characteristics. The design of maintenance plan is a key step in modern conservation that is more and more oriented to preventive restoration and continuous care techniques in spite of sporadic and extraordinary restoration interventions. In this work, a lot of effort has been put into the design of an inspection form that needs to be strongly efficient in saving time and economic resources and in the research of low impact activities of maintenance
Las Casas Tapadas de Plazuelas - Structural damage, weathering characteristics and technical properties of volcanic rocks in Guanajuato, Mexico
No full textLas Casas Tapadas de Plazuelas - Structural damage, weathering characteristics and technical properties of volcanic rocks in Guanajuato, Mexico
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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
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
Assessment of the physical behavior of historic bricks and their mechanical characteristics via absorption and ultrasound tests
No full textCapillary suction rate in construction materials is probably the main parameter controlling decay phenomena related to water together with environmental conditions and it is directly related to porosity. On site, when performing non-destructive tests on masonry such as acoustic tests the moisture content distribution or other building material physical properties, i.e. density or porosity, are generally unknown. These affect the acoustic signal propagation and attenuation and, in historic brick masonry, it is expected to find high variability of them. Guidance in this sense cannot be found in test standards because of the almost infinite number of masonries. The paper reports laboratory work conducted on several fired clay bricks sampled from historic buildings, of diverse dimensions, age and
health-state conditions. Capillary rise tests were carried out and suction velocities were determined. Moreover, hydrostatic and saturated weights were measured. In addition, the bricks were mechanically characterised via high-frequency ultrasonic tests, repeated in dry and saturated material conditions. The results are useful for a better insight into the hygrophysical variations and behaviour of historic masonry and for a more accurate mechanical characterisation of structural elements in historic constructions
Long-term monitoring of decay evolution in bricks and lime mortar affected by salt crystallisation
No full textThe consequences of moisture and dissolved salt capillary rise in porous construction materials are major causes of aesthetic and mechanical decay in masonry. Given the limitations of the present
esting standards related with construction materials ageing, work is necessary to reduce some of the gaps. For a better comprehension of the evolution of this complex phenomenon and of its effects, an experimental work was initiated some years back in the Building Science group in Bologna University, Italy, aimed at monitoring environmental degradation in masonry materials typical of historic structures. Of particular interest is natural ageing with low-concentration brines and long-term monitoring. To achieve this aim, a first step is to know the mechanical and hygrothermal properties of masonry’s constituent materials, in at least two rather different stages in the structure’s lifetime, together with the environmental conditions endured during that timeframe.
Knowing in quantitative terms how the physical and load-bearing properties may have decreased, can help in establishing degradation indexes to predict the rate of material decay.
The contribution reports on the outcome of capillary water absorption tests conducted in a controlled environment on solid brick units and lime mortar prisms. The materials were tested twice: as-new and after five summer seasons of natural outdoor exposure in southern European climate together with provoked capillary rise either by tap water or by lowconcentrated sodium chloride or sodium sulphate brines. The values of the absorption rate determined for the different materials and salts are compared with the pre- and postexperimental ultrasonic signal velocities. By means of thin section analysis, alterations of the different materials during the long term monitoring were observed. The obtained values are of interest from different viewpoints, such as to evaluate possible changes in the
masonry material’s diffusivity, to create a database or as input for numerical simulations
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