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Articles 1 - 11 of 11
Full-Text Articles in Physical Sciences and Mathematics
Simulating And Modelling Opinion Dynamics, Jennifer Heermance
Simulating And Modelling Opinion Dynamics, Jennifer Heermance
Graduate Research Theses & Dissertations
The foundation of social media is conversation. Social media allows people to share ideas and opinions, as well as discuss those opinions. A point of intrigue for many social scientists is how those opinions change through interaction with others. What influences someone’s opinion? When is a person willing to adapt their opinion, and when does it remain the same? Is it possible to measure these opinion dynamics? Our overall goal is to develop a more comprehensive model for opinion dynamics. The first step of this process is to simulate data that can then be analyzed and used to develop a …
Social Correlation In Latent Spaces For Complex Networks, Freddy Chong Tat Chua
Social Correlation In Latent Spaces For Complex Networks, Freddy Chong Tat Chua
Dissertations and Theses Collection (Open Access)
This dissertation addresses the subject of measuring social correlation among users within a complex social network. Social correlation is closely related to the measurement of social influence in social sciences. While social influence focuses on the existence of causal influence among users, we take a computational approach to measure correlation strength among users based on their shared interactions. We call this social correlation. To formally model social correlation, we propose a framework which contains two major parts. The first part is that of representing users behavior in a computationally efficient and accurate manner. For example, social media users perform many …
The Influence Of Prescribed Fire On The Extent Of Wildfire In Savanna Landscapes Of Western Arnhem Land, Australia, Owen F. Price, Jeremy Russell-Smith, Felicity Watt
The Influence Of Prescribed Fire On The Extent Of Wildfire In Savanna Landscapes Of Western Arnhem Land, Australia, Owen F. Price, Jeremy Russell-Smith, Felicity Watt
Faculty of Science - Papers (Archive)
Fire regimes in many north Australian savanna regions are today characterised by frequent wildfires occurring in the latter part of the 7-month dry season. A fire management program instigated from 2005 over 24 000 km2 of biodiversity-rich Western Arnhem Land aims to reduce the area and severity of late dry-season fires, and associated greenhouse gas emissions, through targeted early dry-season prescribed burning. This study used fire history mapping derived mostly from Landsat imagery over the period 1990-2009 and statistical modelling to quantify the mitigation of late dry-season wildfire through prescribed burning. From 2005, there has been a reduction in mean …
The Influence Of Sediment Particle Size And Organic Carbon On Toxicity Of Copper To Benthic Invertebrates In Oxic/Suboxic Surface Sediments, David Strom, Stuart L. Simpson, Graeme E. Batley, Dianne F. Jolley
The Influence Of Sediment Particle Size And Organic Carbon On Toxicity Of Copper To Benthic Invertebrates In Oxic/Suboxic Surface Sediments, David Strom, Stuart L. Simpson, Graeme E. Batley, Dianne F. Jolley
Faculty of Science - Papers (Archive)
The use of sediment quality guidelines to predict the toxicity of metals in sediments is limited by an inadequate understanding of exposure pathways and by poor causal links between exposure and effects. For a 10-d exposure to Cu-spiked sediments, toxicity to the amphipod Melita plumulosa was demonstrated to occur through a combination of dissolved and dietary Cu exposure pathways, but for the bivalves Spisula trigonella and Tellina deltoidalis, toxicity occurred primarily by exposure to dissolved Cu. For relatively oxidized sediments that had moderate amounts of organic carbon (2.6-8.3% OC), silt (20-100%
Twitterrank: Finding Topic-Sensitive Influential Twitterers, Jianshu Weng, Ee Peng Lim, Jing Jiang, Qi He
Twitterrank: Finding Topic-Sensitive Influential Twitterers, Jianshu Weng, Ee Peng Lim, Jing Jiang, Qi He
Research Collection School Of Computing and Information Systems
This paper focuses on the problem of identifying influential users of micro-blogging services. Twitter, one of the most notable micro-blogging services, employs a social-networking model called "following", in which each user can choose who she wants to "follow" to receive tweets from without requiring the latter to give permission first. In a dataset prepared for this study, it is observed that (1) 72.4% of the users in Twitter follow more than 80% of their followers, and (2) 80.5% of the users have 80% of users they are following follow them back. Our study reveals that the presence of "reciprocity" can …
Sex Ratio Of Breeding Common Toads (Bufo Bufo) - Influence Of Survival And Skipped Breeding, Jon Loman, Thomas R. Madsen
Sex Ratio Of Breeding Common Toads (Bufo Bufo) - Influence Of Survival And Skipped Breeding, Jon Loman, Thomas R. Madsen
Faculty of Science - Papers (Archive)
Anuran sex ratio at breeding sites is typically male biased. Such sex ratios may be due to poor female survival, to females not breeding as frequently as males and/or to males becoming sexually mature earlier than females. In the present study, the first two factors are analyzed in a common toad (Bufo bufo) population in southern Sweden. Toads were captured, marked and recaptured at the breeding site during 5 years. Within season capture patterns were analyzed using the Jolly-Seber model and among-year captures using the Closed robust design model. Population estimates of males and females yielded an among year variation …
Influence Of Polyunsaturated Fatty Acids On Intestinal Barrier Function During Colitis, Bianca Knoch, Warren C. Mcnabb, Nicole Roy
Influence Of Polyunsaturated Fatty Acids On Intestinal Barrier Function During Colitis, Bianca Knoch, Warren C. Mcnabb, Nicole Roy
Faculty of Science - Papers (Archive)
Tight junction proteins are important for intestinal homeostasis. They prevent paracellular transport of large molecules and maintain cell polarity. Impaired tight junction function leads to a more permeable intestinal epithelial barrier and therefore potentially increases disease risk. Limited information is available concerning the effects of food components on the intestinal barrier, particularly paracellular permeability and tight junction proteins. In vitro studies with intestinal epithelial cells and in vivo studies using animal models have demonstrated that dietary n-3 and n-6 polyunsaturated fatty acids (PUFAs), particularly n-3, can reduce intestinal inflammation and permeability. PUFAs can induce transcriptional regulators which may act in …
Larval Settlement Preference Of A Native Bivalve: The Influence Of An Invasive Alga Versus Native Substrata, Paul E. Gribben, Jeffrey T. Wright, Wayne A. O'Connor, Peter Steinberg
Larval Settlement Preference Of A Native Bivalve: The Influence Of An Invasive Alga Versus Native Substrata, Paul E. Gribben, Jeffrey T. Wright, Wayne A. O'Connor, Peter Steinberg
Faculty of Science - Papers (Archive)
Recruitment patterns of marine invertebrates are strongly influenced by the habitat preference of larvae as larvae can choose to settle (or not) in response to positive or negative cues. High abundances of recruits of the native infaunal bivalve Anadara trapezia occur in the invasive alga Caulerpa taxifolia compared to native habitats. Using controlled laboratory experiments, A. trapezia larval habitat preference was investigated through exposure to available native (adult A. trapezia, Zostera capricorni and sediment from unvegetated areas) and invasive (C. taxifolia and sediments from C. taxifolia) substrata that co-occur in estuaries invaded by C. taxifolia in New South Wales, Australia. …
Thermoregulation By Kangaroos From Mesic And Arid Habitats: Influence Of Temperature On Routes Of Heat Loss In Eastern Grey Kangaroos (Macropus Giganteus) And Red Kangaroos (Macropus Rufus), Terence J. Dawson, Cyntina E. Blaney, Adam J. Munn, Andrew Krockenberger, Shane K. Maloney
Thermoregulation By Kangaroos From Mesic And Arid Habitats: Influence Of Temperature On Routes Of Heat Loss In Eastern Grey Kangaroos (Macropus Giganteus) And Red Kangaroos (Macropus Rufus), Terence J. Dawson, Cyntina E. Blaney, Adam J. Munn, Andrew Krockenberger, Shane K. Maloney
Faculty of Science - Papers (Archive)
We examined thermoregulation in red kangaroos (Macropus rufus) from deserts and in eastern grey kangaroos (Macropus giganteus) from mesic forests/woodlands. Desert kangaroos have complex evaporative heat loss mechanisms, but the relative importance of these mechanisms is unclear. Little is known of the abilities of grey kangaroos. Our detailed study of these kangaroos' thermoregulatory responses at air temperatures (T-a) From -5 degrees to 45 degrees C showed that, while some differences occur, their abilities are fundamentally similar. Both species show the basic marsupial characteristics of relatively low basal metabolism and body temperature (T-b). Within the thermoneutral zone, T-b was 36.3 degrees …
The Separation Of Facts And Values, Arthur Kantrowitz
The Separation Of Facts And Values, Arthur Kantrowitz
RISK: Health, Safety & Environment (1990-2002)
Dr. Kantrowitz maintains that much modern pessimism derives from failure to separate what is from what ought to be and urges that scientific conflicts be resolved as value neutrally as possible.
The Media, Risk Assessment And Numbers: They Don't Add Up, Sharon M. Friedman
The Media, Risk Assessment And Numbers: They Don't Add Up, Sharon M. Friedman
RISK: Health, Safety & Environment (1990-2002)
Professor Friedman argues that, for risks to be reported accurately, journalism educators must help their students understand science, numbers and statistics.