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Search Results: 1 - 10 of 201081 matches for " Stuart N. Field "
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A superconducting "dripping faucet"
Stuart B. Field,Gheorghe Stan
Physics , 2006,
Abstract: When a current is applied to a type-I superconducting strip containing a narrow channel across its width, magnetic flux spots nucleate at the edge and are then driven along the channel by the current. These flux "drops" are reminiscent of water drops dripping from a faucet, a model system for studying low-dimensional chaos. We use a novel high-bandwidth Hall probe to detect in real time the motion of individual flux spots moving along the channel. Analyzing the time series consisting of the intervals between successive flux drops, we find distinct regions of chaotic behavior characterized by positive Lyapunov exponents, indicating that there is a close analogy between the dynamics of the superconducting and water drop systems.
Digitise This! A Quick and Easy Remote Sensing Method to Monitor the Daily Extent of Dredge Plumes
Richard D. Evans, Kathy L. Murray, Stuart N. Field, James A. Y. Moore, George Shedrawi, Barton G. Huntley, Peter Fearns, Mark Broomhall, Lachlan I. W. McKinna, Daniel Marrable
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0051668
Abstract: Technological advancements in remote sensing and GIS have improved natural resource managers’ abilities to monitor large-scale disturbances. In a time where many processes are heading towards automation, this study has regressed to simple techniques to bridge a gap found in the advancement of technology. The near-daily monitoring of dredge plume extent is common practice using Moderate Resolution Imaging Spectroradiometer (MODIS) imagery and associated algorithms to predict the total suspended solids (TSS) concentration in the surface waters originating from floods and dredge plumes. Unfortunately, these methods cannot determine the difference between dredge plume and benthic features in shallow, clear water. This case study at Barrow Island, Western Australia, uses hand digitising to demonstrate the ability of human interpretation to determine this difference with a level of confidence and compares the method to contemporary TSS methods. Hand digitising was quick, cheap and required very little training of staff to complete. Results of ANOSIM R statistics show remote sensing derived TSS provided similar spatial results if they were thresholded to at least 3 mg L?1. However, remote sensing derived TSS consistently provided false-positive readings of shallow benthic features as Plume with a threshold up to TSS of 6 mg L?1, and began providing false-negatives (excluding actual plume) at a threshold as low as 4 mg L?1. Semi-automated processes that estimate plume concentration and distinguish between plumes and shallow benthic features without the arbitrary nature of human interpretation would be preferred as a plume monitoring method. However, at this stage, the hand digitising method is very useful and is more accurate at determining plume boundaries over shallow benthic features and is accessible to all levels of management with basic training.
Sediment and Turbidity Associated with Offshore Dredging Increase Coral Disease Prevalence on Nearby Reefs
F. Joseph Pollock, Joleah B. Lamb, Stuart N. Field, Scott F. Heron, Britta Schaffelke, George Shedrawi, David G. Bourne, Bette L. Willis
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0102498
Abstract: In recent decades, coral reef ecosystems have declined to the extent that reefs are now threatened globally. While many water quality parameters have been proposed to contribute to reef declines, little evidence exists conclusively linking specific water quality parameters with increased disease prevalence in situ. Here we report evidence from in situ coral health surveys confirming that chronic exposure to dredging-associated sediment plumes significantly increase the prevalence of white syndromes, a devastating group of globally important coral diseases. Coral health surveys were conducted along a dredging-associated sediment plume gradient to assess the relationship between sedimentation, turbidity and coral health. Reefs exposed to the highest number of days under the sediment plume (296 to 347 days) had two-fold higher levels of disease, largely driven by a 2.5-fold increase in white syndromes, and a six-fold increase in other signs of compromised coral health relative to reefs with little or no plume exposure (0 to 9 days). Multivariate modeling and ordination incorporating sediment exposure level, coral community composition and cover, predation and multiple thermal stress indices provided further confirmation that sediment plume exposure level was the main driver of elevated disease and other compromised coral health indicators. This study provides the first evidence linking dredging-associated sedimentation and turbidity with elevated coral disease prevalence in situ. Our results may help to explain observed increases in global coral disease prevalence in recent decades and suggest that minimizing sedimentation and turbidity associated with coastal development will provide an important management tool for controlling coral disease epizootics.
I BELIEVE IN THE HOLY EARTHY CHURCH: TOWARD AN ECOLOGICAL REINTERPRETATION OF THE HOLINESS OF THE CHURCH
David N. Field
Scriptura , 2013, DOI: 10.7833/111-1-20
Abstract: This article develops a re-interpretation of the holiness of the church. It comprises two main sections. The first re-examines the motif of holiness by critically examining use of this motif in selected biblical traditions. This will form the basis for the development of an ecological understanding of holiness. The second part will examine what on earth it means to confess that the church is ecologically holy given, its all too obvious failures and the pervasive influence of the socio-cultural and politico-economic forces that are destructive to the earth. doi: 10.7833/111-1-20
Postprandial Reactive Hypoglycaemia: Varying Presentation Patterns on Extended Glucose Tolerance Tests and Possible Therapeutic Approaches
Kevin Stuart,Annmarie Field,Jessie Raju,Sudarshan Ramachandran
Case Reports in Medicine , 2013, DOI: 10.1155/2013/273957
Abstract:
Unprecedented Mass Bleaching and Loss of Coral across 12° of Latitude in Western Australia in 2010–11
James A. Y. Moore, Lynda M. Bellchambers, Martial R. Depczynski, Richard D. Evans, Scott N. Evans, Stuart N. Field, Kim J. Friedman, James P. Gilmour, Thomas H. Holmes, Rachael Middlebrook, Ben T. Radford, Tyrone Ridgway, George Shedrawi, Heather Taylor, Damian P. Thomson, Shaun K. Wilson
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0051807
Abstract: Background Globally, coral bleaching has been responsible for a significant decline in both coral cover and diversity over the past two decades. During the summer of 2010–11, anomalous large-scale ocean warming induced unprecedented levels of coral bleaching accompanied by substantial storminess across more than 12° of latitude and 1200 kilometers of coastline in Western Australia (WA). Methodology/Principal Findings Extreme La-Ni?a conditions caused extensive warming of waters and drove considerable storminess and cyclonic activity across WA from October 2010 to May 2011. Satellite-derived sea surface temperature measurements recorded anomalies of up to 5°C above long-term averages. Benthic surveys quantified the extent of bleaching at 10 locations across four regions from tropical to temperate waters. Bleaching was recorded in all locations across regions and ranged between 17% (±5.5) in the temperate Perth region, to 95% (±3.5) in the Exmouth Gulf of the tropical Ningaloo region. Coincident with high levels of bleaching, three cyclones passed in close proximity to study locations around the time of peak temperatures. Follow-up surveys revealed spatial heterogeneity in coral cover change with four of ten locations recording significant loss of coral cover. Relative decreases ranged between 22%–83.9% of total coral cover, with the greatest losses in the Exmouth Gulf. Conclusions/Significance The anomalous thermal stress of 2010–11 induced mass bleaching of corals along central and southern WA coral reefs. Significant coral bleaching was observed at multiple locations across the tropical-temperate divide spanning more than 1200 km of coastline. Resultant spatially patchy loss of coral cover under widespread and high levels of bleaching and cyclonic activity, suggests a degree of resilience for WA coral communities. However, the spatial extent of bleaching casts some doubt over hypotheses suggesting that future impacts to coral reefs under forecast warming regimes may in part be mitigated by southern thermal refugia.
Romantic Breakups, Heartbreak and Bereavement—Romantic Breakups  [PDF]
Tiffany Field
Psychology (PSYCH) , 2011, DOI: 10.4236/psych.2011.24060
Abstract: This literature review suggests that romantic breakups may lead to bereavement symptoms including intrusive thoughts and attempts to suppress them and insomnia as well as morbidity factors including broken heart syndrome and immune dysfunction. Although the broken heart syndrome has mimicked real heart attacks, angiograms revealed no clogged arteries or permanent heart damage. Compromised immune function may result from reduced vagal activity and increased cortisol and catecholamines leading to increased inflammatory cytokines and decreased natural killer cell activity. The model proposed here is that romantic breakups result in the loss of a person as a regulator of stimulation and arousal modulation that can then lead to these physiological and biochemical effects. These data highlight the complexity of romantic breakups, heartbreak and bereavement and the need for multi-variable research on these systems both before and after the breakups occur.
Relationships as Regulators  [PDF]
Tiffany Field
Psychology (PSYCH) , 2012, DOI: 10.4236/psych.2012.36066
Abstract: This paper reviews the Hofer (1984, 1996) and Field (1985, 1994) models on relationships as regulators, suggesting that relationships regulate optimal stimulation and thereby modulate arousal levels and attenuate stress. In these models, the behavioral, physiological and biochemical rhythms of individuals become synchronized within close relationships like mother-infant and peer relationships both in human and animal species, and they become more coordinated over time, with some potentially remaining stable, much like zeitgebers. Hofer supports his model by data on infant rat separation stress and Field describes “psychobiological attunement” between human infants and their mothers and between young peers. This review revisits the “relationships as regulators” model, summarizing studies on relationships between non-depressed versus depressed mothers and their infants, between infant, preschool and preadolescent friends versus acquaintances and between happily versus unhappily married couples. Although some behavioral and physiological data support Hofer’s and Field’s “relationships as regulators” model, many studies on relationships have focused instead on the effects of separation or loss. Both Hofer and Field suggest that the real question is “what was there about the relationship that was then missing after the loss?” Future research could address the question of potential mediators and underlying mechanisms for relationships becoming regulators. Potential mediators are explored here including mirror neurons, affective priming, imitation and empathy. The individuals’ rhythms and the attraction to others’ rhythms as regulators may be an epigenetic programming phenomenon, suggesting both genetic and early experience effects that endure across development.
Dynamic Stability of Coral Reefs on the West Australian Coast
Conrad W. Speed, Russ C. Babcock, Kevin P. Bancroft, Lynnath E. Beckley, Lynda M. Bellchambers, Martial Depczynski, Stuart N. Field, Kim J. Friedman, James P. Gilmour, Jean-Paul A. Hobbs, Halina T. Kobryn, James A. Y. Moore, Christopher D. Nutt, George Shedrawi, Damian P. Thomson, Shaun K. Wilson
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0069863
Abstract: Monitoring changes in coral cover and composition through space and time can provide insights to reef health and assist the focus of management and conservation efforts. We used a meta-analytical approach to assess coral cover data across latitudes 10–35°S along the west Australian coast, including 25 years of data from the Ningaloo region. Current estimates of coral cover ranged between 3 and 44% in coral habitats. Coral communities in the northern regions were dominated by corals from the families Acroporidae and Poritidae, which became less common at higher latitudes. At Ningaloo Reef coral cover has remained relatively stable through time (~28%), although north-eastern and southern areas have experienced significant declines in overall cover. These declines are likely related to periodic disturbances such as cyclones and thermal anomalies, which were particularly noticeable around 1998/1999 and 2010/2011. Linear mixed effects models (LME) suggest latitude explains 10% of the deviance in coral cover through time at Ningaloo. Acroporidae has decreased in abundance relative to other common families at Ningaloo in the south, which might be related to persistence of more thermally and mechanically tolerant families. We identify regions where quantitative time-series data on coral cover and composition are lacking, particularly in north-western Australia. Standardising routine monitoring methods used by management and research agencies at these, and other locations, would allow a more robust assessment of coral condition and a better basis for conservation of coral reefs.
Metastatic Transitional Cell Carcinoma of the Bladder to the Testis: A Case Report
Gregory N. Kozak,Nicholas C. Field
Case Reports in Urology , 2012, DOI: 10.1155/2012/486245
Abstract: An 84-year-old gentleman presented with onset of gross hematuria in September 2010. Follow-up investigations revealed T1 superficially invasive, poorly differentiated, papillary urothelial carcinoma. He subsequently had GreenLight laser for BPH and bladder neck contracture on two occasions. He developed a right hydrocele 16 months after initial presentation and during his hydrocelectomy, a rock-hard right epididymis and testicle were discovered. Pathology revealed metastatic urothelial carcinoma replacing nearly the entire testis with lymphovascular invasion.
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