1,720,962 research outputs found
Lo sviluppo della filiera corta del legno: classificazione, caratterizzazione meccanica e applicazione del legno locale naturale e termo-trattato.
No full textShort supply chain wood achieved by means of a sustainable forest management can produce several benefits such as: the increase in value of the forested areas due to the alternative use of wood in modern structural components; the environmental advantages as CO2 emissions reduction, landscaping improvement and landslide hazard reduction; the economic recovery of areas usually underdeveloped and abandoned. Abruzzo Region, in the central-southern area of the Italian peninsula, offers extensive wooded areas of about 400.000 ha with different timber species. The most abundant softwood species is pine with about 19.000 ha out of a total of about 25.000 ha of covered area. The most abundant hardwood species is beech with about 122.000 ha out of a total of about 360.000 ha of forested areas. The aim of this work is to study possible applications of local wood in the construction sector, with particular regard to the aforementioned species, in order to encourage its use also in high technological content products such as glue-laminated timber (glulam) beams and cross-laminated timber (X-lam or CLT) panels.
Experimental tests along with analytical models and numerical simulations were considered and performed to compare novel engineered wood products, made of Italian beech and Corsican pine wood, with commercial components made of softwood. The mechanical characterization of these products was achieved as well as the study of interesting topics such as the in-plane behaviour, with the in-depth analysis of the buckling phenomenon, and the out-of-plane behaviour, for the reinforcement of existing timber floors, of CLT panels.
Furthermore, the application of glulam joists and timber planks made of Italian beech wood for the realization of new wooden floors was studied, with insights about flexible timber-to-timber connections.
Beech results a timber species with a great potential, thanks to its high mechanical properties; on the other hand, Corsican pine offers light weight and more workability. Therefore, these two timber species are compatible to each other to produce laminated wood, with a noteworthy possibility to optimize the material depending on the future state of stress of the single lamellas, and they result to be important resources for structural purposes
Timber-timber composite (TTC) joints made of short-supply chain beech: Push-out tests of inclined screw connectors
Get PDFThis paper presents the results of experimental investigations on six-layered, homogeneous glulam beams made of Italian short supply chain beech (Fagus sylvatica L.). At first, the beams were produced and mechanically characterized for bending, then, they were employed to realize timber-timber composite joints and tested under quasi-static monotonic loading. The test configurations were adopted to reproduce connections used in timber-to-timber composite structures for applications in new constructions. Outcomes in terms of connection stiffness, strength, static ductility and failure modes are presented and discussed. Moreover, the experimental stiffness were used to carry out analytical verification at the serviceability and ultimate limit states to extend the validity of the proposed screw and specimen’s configurations
Out-of-Plane Strengthening of Existing Timber Floors with Cross Laminated Timber Panels Made of Short Supply Chain Beech
Get PDFEstablishing short supply chains for timber has become important especially in Italy, which is an historically wood-importer country. Timber is an environmentally friendly construction material and a potential mean to reduce carbon footprint produced every year by the building sector. In addition to its sustainability benefits, reversible strengthening interventions can be attained for existing structures. As such, timber can be efficiently used to preserve and protect historical buildings which are, due to architectural and aesthetic values, fundamental components of the Italian cultural heritage. In this study, the use and potential of novel cross-laminated (X-Lam or CLT) timber panels made of Italian hardwood (i.e., beech) for strengthening of existing timber floors is investigated. A quantitative comparison between the mechanical performances of the proposed wood-based product and common retrofitting techniques, such as double-crossed timber planks and reinforced concrete slabs, is carried out in terms of bending stiffness (which is evaluated according to Eurocode 5), influence of weight and reversibility of intervention. It is shown that CLT panels represent a good compromise/alternative for the realisation of reversible and sustainable reinforcing interventions, with rather well promising performances
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
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
Corrigendum to “Mechanical characterization of novel Homogeneous Beech and hybrid Beech-Corsican Pine thin Cross-Laminated timber panels” [Constr. Build. Mater. 271 (2021) 121589] (Construction and Building Materials (2021) 271, (S0950061820335935), (10.1016/j.conbuildmat.2020.121589))
No full textCorrigendum to “Mechanical characterization of novel Homogeneous Beech and hybrid Beech-Corsican Pine thin Cross-Laminated timber panels” [Constr. Build. Mater. 271 (2021) 121589
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe 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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