1,720,958 research outputs found
The use of granite by-products deriving from tunneling excavations for road construction purposes
No full textThe purpose of this research is to verify the possibility of using granite by-products deriving from tunnel excavations for road construction purposes. This case study refers to the granite deriving from tunnels excavated on the south east coast on the island of Sardinia (Fig.1). The granite by-products were produced using Drilling and Blasting (D&B) and Tunnel and Boring Machine (TBM) excavation techniques. Two potential applications of granite by-products road sub-base and soil-cement mixtures for base layers were studied. The test results indicated that physical and mechanical properties of recycled aggregates are suitable for road base and sub-base, also the compressive strength tests conducted on the soil-cement mixture were in the limits imposed by the specifications using low percentages (2-3 %) of Portland cement
THE USE OF GRANITE BY-PRODUCTS DERIVING FROM TUNNELING EXCAVATIONS FOR ROAD CONSTRUCTION PURPOSES
No full textMONITORING THE PERFORMANCES IN REAL WORKING CONDITIONS OF C&D WASTE MATERIALS IN ROAD CONSTRUCTION USING EMBEDDED INSTRUMENTS
No full textThis paper reports the results obtained so far, of the research conducted to verify the
compatibility of construction and demolition waste (C&D) as alternative materials for
road constructions. Annually highway and construction industries consume a huge
amount of aggregates deriving from quarries, causing considerable energy and
environmental losses. Understand how this new type of materials behave on the
physical and mechanical point of view is important to encourage and develop their
use. Pavement material behaviour is affected by many factors (i.e., load magnitude,
material properties and environmental conditions), therefore not only laboratory tests
are important but especially evaluate mechanical performances in real working
conditions (Rombi at al., 2010). For this purpose an experimental road, 30 m long and
4 m wide, was built. At three different depths a total of n°12 instruments were
installed: 3 pressure cells to measure stresses and 9 Linear Variable Differential
Transformers (LVDTs) to measure deformations. In situ tests were conducted for each
layer during construction. At the end of the construction and after a year tests were
repeated to verify the mechanical behaviour in the long term. The data were collected
from the pressure cells and LVDTs under different load and speed magnitude. At this
point of the research data are being analysed and compared, and the results reported
on this paper. In the near future all the data collected will be used to calibrate a
mathematical model in order to predict C&D performances in real working
conditions. To be able to understand how pavement materials, no matter what type of
material you are using C&D or natural aggregates, respond to traffic and
environmental loading is fundamental when designing pavements and evaluating their
performance
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
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
- …
