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Characterization of a Natural Clayey Silt and the Effects of Sample Disturbance on Soil Behavior and Engineering Properties
No full textSilts are considered a challenging material to deal with in geotechnical engineering design practice and there has been limited research on determining the engineering parameters of silts either by in situ or laboratory testing. This thesis presents results of an extensive research program that investigated the in situ and laboratory behavior of a low plasticity silt deposit at the Norwegian National Geotechnical Test Site at Halden, Norway. Results from multiple in situ tests including: piezocone, pore pressure dissipation, in situ pore pressure measurements, field vane, self-boring pressuremeter and screw plate load tests were synthesized to characterize the Halden silt. Soil sampling using a suite of different samplers of varying sampler geometry and sampling methods were conducted. Laboratory tests performed on the collected samples included: index and soil classification, oedometer, consolidated undrained and drained triaxial, bender element and constant volume direct simple shear. The laboratory tests provided data for interpretation of geological setting, depositional history, deformation, strength, stiffness and hydraulic flow properties of the different soil units at the site. Moreover, simulated tube sampling performed on block sample and reconstituted specimens of silt using the ideal sampling approach complemented data provided by the different soil samplers. These results advanced the understanding of the effects of tube sample disturbance on engineering parameters in this soil type. Results revealed two soil units of low plasticity clayey silt (ML) over silty clay (CL). Geology and the normally consolidated stress state of the underlying clay unit indicates that the silt is near normally consolidated as well. Interpretation of the undrained shear strength of the silt specimens was complex as the in situ tests were potentially influenced by partial drainage while conventional undrained triaxial tests displayed dilative type behavior with no unique (peak) undrained shear strength. Significant alteration of the intact or reconstituted soil state occurred during field sampling using a poor geometry sampler and likewise during laboratory simulation of poor geometry tube sampling. Yet, the clay-based sample quality assessment methods using recompression strains did not track sample quality well for the Halden silt nor did shear wave velocity. The effects of sample disturbance were very pronounced in undrained triaxial shear with generally increasing undrained shear strength with increasing disturbance but with little to no change in the effective stress friction angle. Based on a collective evaluation of the laboratory and in situ screw plate load tests practical recommendations on selection of undrained shear strength for design and associated foundation performance are provided.Doctor of Philosophy (Ph.D.
Halden research site - Site characterisation and engineering properties of Halden silt
No full textHalden silt site is property of Halden municipality and it is known locally as Rødsparken. As part of the fully characterization of Halden silt site during NGTS project, two main reports are prepared: 1) a factual report (20160154-04-R) and 2) an interpretation report (20160154-05-R) (see figure in the next page). The present report (20160154-05-R) presents an interpretation of all laboratory and in situ testing carried out for the NGTS project between May 2015 and May 2018
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
Norwegian Geotest Sites
Get PDFHalden silt site is property of Halden municipality and it is known locally as Rødsparken. As part of the fully characterization of Halden silt site during NGTS project, two main reports are prepared: 1) a factual report (20160154-04-R) and 2) an interpretation report (20160154-05-R) (see figure in the next page). The present report (20160154-05-R) presents an interpretation of all laboratory and in situ testing carried out for the NGTS project between May 2015 and May 2018.publishedVersio
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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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