1,721,070 research outputs found
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
Study on the Accuracy of Rock Surface Roughness Data using Close Range Photogrammetry
No full textIn civil and mining engineering areas, close range photogrammetry (CRP) has been used in recent years to investigate various aspects of rock faces such as geological structures, weathering, and crack propagations. The 3D models of CRP are efficiently used for the mapping and characterization of rock slopes on the cost-effective and less labor-intensive advantages of digital photogrammetry. The recent development of high-end equipment for remote sensing surveys in the field of digital cameras and photographing technology has also encouraged the spread of CRP to obtain accurate geomorphological data from the photogrammetric 3D images.
The roughness of rock joint planes is a crucial factor to investigate the shear strength and the groundwater infiltration characteristics along the joint planes. In geological and geotechnical purposes, the degree of roughness is identified by roughness parameters and the values are obtained from observations using large and small scale profiles in laboratory and field conditions. As a representative parameter, the rock joint roughness coefficient (JRC) has been widely employed combined with its strength characteristics. In order to measure the surface roughness, manual measurements using a profile gauge have been traditionally taken in both laboratory and field investigations. This mapping process is quite labourious and involves risks during field work. For this reason, close range photogrammetry has advantages over the traditional mapping methods in reducing surveying time and minimizing possible risks involved in field work.Thesis (PhD Doctorate)Doctor of Philosophy (PhD)Griffith School of EngineeringScience, Environment, Engineering and TechnologyFull Tex
Effect of xanthan gum and lignin biopolymers on engineering properties of soil
No full textThe escalating human population and urbanization necessitate construction on challenging soils, underscoring the imperative to enhance their characteristics. With environmental concerns associated with conventional soil stabilization agents like cement, there is a growing demand for eco-friendly alternatives. This study explores the viability of biopolymer soil stabilizers, specifically xanthan gum, and lignin, to improve soil geotechnical properties. Laboratory and flume experiments were conducted to assess their efficacy against soil erosion, slope failure, and overall soil properties enhancement. [...]Thesis (PhD Doctorate)Doctor of Philosophy (PhD)School of Eng & Built EnvScience, Environment, Engineering and TechnologyFull Tex
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
Large-Scale Laboratory Study on Behaviour of Reactive Soil from Southeast Queensland and its Practical Applications
No full textReactive/ expansive soils are a type of soil that undergo significant volume changes in response to changes in moisture content. These soils typically contain clay minerals, such as montmorillonite, which have the ability to absorb water and expand, leading to swelling. Conversely, during dry periods, these soils can also shrink, leading to subsidence and structural damage to buildings, roads, and other light weight infrastructure.
Over recent decades, extensive research has been dedicated to understanding the influence of initial conditions on soil swell by numerous researchers. However, a predominant focus of this research has been on small-scale oedometer tests. Although some researchers have conducted large-scale laboratory and field experiments, their implementation has been constrained by factors such as cost, time limitations, and technical complexities. Nevertheless, with anticipated shifts in rainfall patterns due to climate change, a notable gap persists in the literature regarding the impact of these patterns on soil swell. Addressing this gap, this study aims to investigate the effects of two distinct rainfall patterns, Rainfall pattern 1(RP1) and Rainfall Pattern 2 (RP2), on the swelling behaviour of reactive soil through a series of large-scale long-term soil column experiments. The study seeks to explain the mechanisms influencing swelling behaviour and compare the obtained data with existing swell prediction methods to validate commonly used approaches in soil swelling analysis. Furthermore, the study attempts to examine the influence of different geosynthetics on the swelling behaviour of reactive soil. [...]Thesis (PhD Doctorate)Doctor of PhilosophySchool of Eng & Built EnvGriffith SciencesFull Tex
Analysis and prediction of rainfall-induced shallow landslides along the road corridors in northern New South Wales, Australia
No full textGlobally, landslides have occurred regularly and caused massive destruction with numerous loss of life. Although they may result from earthquakes, geological factors and human activities, landslides are mostly caused by heavy or prolonged rainfall. Furthermore, research indicates that rainfall-induced landslides are primarily responsible for landslides that occur on mountainous terrains. Some of the worst rainfall-induced landslides across the world which caused loss of life and destruction of property and infrastructure, occurred in Nepal in 1926, 1988 and 2009; in Thailand in 2008; in India in 2009 and in Japan in 2012. Thredbo landslide occurred in southern region of New South Wales (NSW), Australia in 1997, killed 18 people, destroyed two lodges and moved over 1000 tonnes of liquefied earth and debris over slope. The cause of this landslide was heavy rainfall, melting snow and leaking water pipeline.
In northern NSW, many roads were closed for weeks and months due to rainfall-induced landslides from 2009 till 2019. Waterfall Way leading to Dorrigo Mountain from Raleigh was closed in 2009 (3 times), 2011, 2013, 2015, 2017 & 2019 and the road users have to travel more than three hours on alternative routes to reach the other side of the Dorrigo Mountain. Gwydir Highway at Gibraltar Range was closed in 2011 and 2013; Oxley Highway at Mt Seaview was closed in 2011 and 2013. Summerland Way at Mt Lindesay was closed in 2011 and 2017 and Bruxner Highway at Mallanganee Range was closed in 2011, 2013 and 2015. Road closures make inconvenience to the road users impacting access, work travel, school travel, medical travel and long-distance travel and there are economic consequences as well.
There were over 100 landslides occurred along the state road corridors in northern region of NSW, Australia, since 2009 till 2019. Rainfall events triggered about 80% of landslides in northern NSW. Rainfall-induced landslides occur in this region in every two years according to historical records from 2009. Mountain passes such as Mt Seaview, Dorrigo Mountain, Gibraltar Range, Ramornie – Cangai Bluff, Mallanganee Range and Mt Lindesay are adversely affected by rainfall-induced landslides.
Therefore, there are economic and social needs to address root causes of rainfall-induced landslides along the road corridors. Despite the common occurrences of rainfall-induced landslides in the Australian region of northern New South Wales (NSW), there has been no study conducted on this phenomenon for this region. This thesis conducts a comprehensive analysis of shallow landslide events that occurred along the road corridors in northern New South Wales (NSW) throughout the period of 2009 - 2019.
Furthermore, this thesis employs the analysis to prognosticate future patterns of rainfall-induced shallow landslides for this region. The scope of this thesis includes analysis of rainfall-induced shallow landslides occurred in coarse-grained soils, prediction of shear strength of coarse-grained soils using soil suction and prediction of rainfall-induced shallow landslides using different approaches such as rainfall threshold, rainfall index and limit equilibrium method in northern NSW. It involves developing a relationship among rainfall characteristics, soil characteristics and slope characteristics.
The study found out that when moisture content of soil is increased, there is a reduction in matric suction and thereby a decrease in shear strength. It also revealed that slopes consist of coarse-grained soils are vulnerable to rainfall-induced landslides. The slopes consist of sedimentary rocks and igneous rocks at mountain passes are vulnerable to landslides. The slopes are susceptible to rainfall-induced shallow landsides when the slope angle is greater than 25 degrees.
The key benefit of this thesis is that government, road authorities and industry can use the simple tools that can predict rainfall-induced shallow landslides in northern NSW. These simple tools include rainfall threshold, rainfall index and the SLIP model that are specifically developed for northern NSW. The findings are also useful for management of road corridor and slopes in the mountain passes.
This study presents the major factors that lead to shallow rainfall-induced landslides in northern NSW and proposes simple tools that can be used to predict this natural disaster. It is believed that these findings will be useful for the relevant industry including decision-makers who manage the slope assets and landslide hazard along the road corridors in northern NSW, Australia. These findings are also applicable to other parts of the world.Thesis (PhD Doctorate)Doctor of Philosophy (PhD)School of Eng & Built EnvScience, Environment, Engineering and TechnologyFull Tex
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