1,721,049 research outputs found
Stabilisation of a landslide on the M25 highway London's main artery
No full textThis paper describes the lessons learnt in the assessment, stabilization and subsequent monitoring of a landslide, which mobilized over 90,000 m3 of material and threatened to completely close England’s busiest highway, the M25 around London. The wedge shaped slide occurred on the 19th December 2000 and extended some 80m up the slope with a slip surface up to 10 m below the ground surface. Due to the strategic importance of the M25, the design and construction was fast tracked to be completed before the fall rains when further movements would be inevitable. The adopted solution used a combination of 1050 mm diameter augered piles, a deep cutoff trench and counterforts at the toe and was extensively instrumented.The collected data for the winter 2001/02 demonstrates that not only were the remedial works successful in stabilizing the slope but that the proposed design method can accurately predict the bending moments and forces produced in the pile
Comparison of the measured and computed performance of a propped bored pile retaining wall at Walthamstow
No full textLong term performance of an embedded retaining wall with a stabilizing base slab
No full textIn 1993, a field study was commenced to investigate the in-service performance of a bored pile retaining wall constructed with a stabilizing base slab below the carriageway in front of the wall. The wall was founded in London Clay and constructed at South Woodford in London in 1976. Instruments were installed in front of and behind the wall as well as in a free field location to provide an assessment of both the lateral stresses acting on the wall faces and the in situ lateral stress existing prior to construction. Total lateral stresses were measured using push-in spade pressure cells, a Marchetti dilatometer, a self-boring expansion pressuremeter and a self-boring load cell pressuremeter. Pore water pressures were recorded using piezometers incorporated in the spade cells. In this paper, the field measurements are presented and discussed in the light of limit-equilibrium-based calculations typically used in design
Behaviour during construction of a stabilized base embedded retaining wall at Coventry
No full textInstrumentation has been installed to monitor the behaviour of a bored pile retaining wall with a stabilising base during and after its construction of the Coventry North-South Road scheme in Warwickshire. Wall movements, wall and base bending moments, loads in the temporary props, and vertical pressures beneath the permanent stabilising base were monitored. In this report, the ground conditions, construction sequence and instrumentation are described and the field measurements during construction and its first two years in service are discussed. The results are compared with a finite element back-analysis and outline recommendations made for the design of similar structures in the future. (A)<br/
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
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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