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Articles 1 - 15 of 15
Full-Text Articles in Physical Sciences and Mathematics
Resilience Of Inshore, Juvenile Snapper Pagrus Auratus To Angling And Release, Matt Broadhurst, Paul Butcher, Karina Hall, Brian Cullis, Shane Mcgrath
Resilience Of Inshore, Juvenile Snapper Pagrus Auratus To Angling And Release, Matt Broadhurst, Paul Butcher, Karina Hall, Brian Cullis, Shane Mcgrath
Professor Brian Cullis
This study assessed the mortality of 157 snapper Pagrus auratus (9–29 cm, total length, LT) after being conventionally angled and then released into cages (along with 48 controls) for 4 days off south-eastern Australia. Fatalities were restricted to 12 angled fish (7·6%) and mostly attributed to the ingestion of hooks and especially their subsequent removal, which caused substantial blood loss and immediate death. Hook ingestion was significantly biased towards smaller fish (LT) and attributed to a lower chance of anglers initially detecting these individuals on the line (allowing them to consume more of the baits). While mortalities might be reduced …
Building Capability For Disaster Resilience, Lynn Crawford, Craig Langston, Bhishna Bajracharya
Building Capability For Disaster Resilience, Lynn Crawford, Craig Langston, Bhishna Bajracharya
Bhishna Bajracharya
All levels of government recognise the widespread devastation of communities by natural or other disasters. They have responded with emergency management arrangements and policies to enhance government and community capacity to anticipate, withstand and recover from disastrous events. Although the construction industry has a significant role to play, particularly in recovery and reconstruction, it has not generally been considered as a key stakeholder in building capability for disaster resilience. One barrier to more active involvement of the construction industry in disaster response and management is that traditional methods of construction project management have been criticised as too time consuming and …
Planning And Design Of Master-Planned Communities For Healthy Living, Bhishna Bajracharya, Linda Too
Planning And Design Of Master-Planned Communities For Healthy Living, Bhishna Bajracharya, Linda Too
Bhishna Bajracharya
Due to growing health concerns linked to inactive living, a number of new master-planned communities in South East Queensland are creating supportive environments for physical activities. Varsity Lakes in Gold Coast is an example of such community which provides both infrastructures and programs to encourage active living. The objective of the paper is to examine the relationship between built environment and healthy communities through a review of current literature. Synthesising these findings, a conceptual framework is developed for supporting active and healthy living in master-planned communities. The three key factors are 1) place; 2) program and 3) partnership. This framework …
Planning And Design Of Master-Planned Communities For Healthy Living, Bhishna Bajracharya, Linda Too
Planning And Design Of Master-Planned Communities For Healthy Living, Bhishna Bajracharya, Linda Too
Linda Too
Due to growing health concerns linked to inactive living, a number of new master-planned communities in South East Queensland are creating supportive environments for physical activities. Varsity Lakes in Gold Coast is an example of such community which provides both infrastructures and programs to encourage active living. The objective of the paper is to examine the relationship between built environment and healthy communities through a review of current literature. Synthesising these findings, a conceptual framework is developed for supporting active and healthy living in master-planned communities. The three key factors are 1) place; 2) program and 3) partnership. This framework …
Using Web 2.0 Technologies For Collaborative Learning In Distance Education- Case Studies From An Australian University, Kristin Den Exter, Stephen Rowe, William Boyd, David Lloyd
Using Web 2.0 Technologies For Collaborative Learning In Distance Education- Case Studies From An Australian University, Kristin Den Exter, Stephen Rowe, William Boyd, David Lloyd
Dr Kristin den Exter
This paper explores the use of Web 2.0 technologies for collaborative learning in a higher education context. A review of the literature exploring the strengths and weaknesses of Web 2.0 technology is presented, and a conceptual model of a Web 2.0 community of inquiry is introduced. Two Australian case studies are described, with an ex-poste evaluation of the use of Web 2.0 tools. Conclusions are drawn as to the potential for the use of Web 2.0 tools for collaborative e-learning in higher education. In particular, design and integration of Web 2.0 tools should be closely related to curriculum intent and …
Association Between Fire Return Interval And Population Dynamics In Four California Populations Of Tecate Cypress (Cupressus Forbesii), Roland De Gouvenain, Ali Ansary
Association Between Fire Return Interval And Population Dynamics In Four California Populations Of Tecate Cypress (Cupressus Forbesii), Roland De Gouvenain, Ali Ansary
Roland de Gouvenain
The Tecate cypress (Cupressus forbesii) is a tree species associated with chaparral ecosystems in southern California and northern Baja California, Mexico. It is fire-adapted, its regeneration triggered by the opening of serotinous cones when adult trees are burned. Surveys made in the 1980s by others suggested that some Tecate cypress populations were declining, and some authors suggested that increased fire frequency in southern California was a major factor for this decline. We asked whether current population trends were still negative for Tecate cypress 20 years later, and whether population growth was associated with fire return interval length. Based on demographic, …
Methods To Convert Local Sampling Coordinates Into Geographic Information System/Global Positioning Systems (Gis/Gps)-Compatible Coordinate Systems, Mark Rudnicki, Thomas Meyer
Methods To Convert Local Sampling Coordinates Into Geographic Information System/Global Positioning Systems (Gis/Gps)-Compatible Coordinate Systems, Mark Rudnicki, Thomas Meyer
Mark Rudnicki
Laying out a sampling transect in the field is a common task when researching natural systems and resources. With widespread availability of global navigation satellite systems (GNSS), such as the US global positioning system (GPS), it is becoming more common to resurvey legacy transects to establish them in globally referenced coordinate systems such as geodetic latitude/longitude or planimetric systems such as the Universal Transverse Mercator (UTM) or the State Plane Coordinate System (SPCS). Transforming local coordinates into a globally referenced coordinate system allows (1) disparate legacy surveys to be combined into a common geographic information system (GIS) database, (2) new …
A High-Resolution, Multi-Channel, Over-Sea-Ice Seismic Reflection Survey Over The Mackay Sea Valley, Granite Harbor, Antarctica, B. Williams, Marvin Speece, Ross Powell
A High-Resolution, Multi-Channel, Over-Sea-Ice Seismic Reflection Survey Over The Mackay Sea Valley, Granite Harbor, Antarctica, B. Williams, Marvin Speece, Ross Powell
M. A Speece
In the austral summer of 2007, 20.5 km of high-resolution over-sea-ice seismic reflection data were collected in the Granite Harbor region of southern McMurdo Sound over the Mackay Sea Valley. The goal of the survey was to image thin pelagic sediment deposited in the Mackay Sea Valley after the Last Glacial Maximum. A generator–injector air gun was lowered beneath the sea ice through holes drilled by an auger drill system. The recording system was a 60 channel snow streamer with vertically oriented gimbaled geophones spaced 25 m apart. Unique problems in the over-sea-ice seismic reflection survey—noise from the ice column …
Emerging Chemicals And Analytical Methods (2006), Matthew Morley, Daniel Snow, Chad Cecrle, Patrick Denning, Lindsey Miller
Emerging Chemicals And Analytical Methods (2006), Matthew Morley, Daniel Snow, Chad Cecrle, Patrick Denning, Lindsey Miller
Daniel D Snow
This review summarizes peer-reviewed literature related to analysis, occurrence, and fate of emerging chemical contaminants in the water environment. The review focuses on the following broad categories of emerging contaminants: pharmaceuticals and personal care products (PPCPs); endocrine disrupting compounds (EDCs), including hormones, surfactants, and plasticizers; and brominated flame retardants (BFRs). Although many of the cited articles refer to multiple types of contaminants (particularly hormones and pharmaceuticals), each article is summarized in only one section. Articles pertaining to specific treatment methods, risk assessments, or biological effects are not included in this review, and articles covering disinfection byproducts (DBPs), fluorinated compounds, and …
Remediating Rdx-Contaminated Ground Water With Permanganate: Laboratory Investigations For The Pantex Perched Aquifer, M. Adam, Steven Comfort, Matthew Morley, Daniel Snow
Remediating Rdx-Contaminated Ground Water With Permanganate: Laboratory Investigations For The Pantex Perched Aquifer, M. Adam, Steven Comfort, Matthew Morley, Daniel Snow
Daniel D Snow
Ground water beneath the U.S. Department of Energy Pantex Plant is contaminated with the high explosive RDX (hexahydro-1,3,5- trinitro-1,3,5 triazine). The USDOE Innovative Treatment and Remediation Demonstration (ITRD) program identified in situ oxidation by permanganate as a technology fit for further investigation. We evaluated the efficacy of KMnO4 to transform and mineralize RDX by determining degradation kinetics and carbon mass balances using 14C-RDX. Aqueous RDX solutions (2–5 mg L–1) and RDX-contaminated slurries (50% solids, w/v) were treated with KMnO4 at 1000, 2000, 4000, and 20,000 mg L–1. Treating an aqueous RDX solution of 2.8 mg L–1 with 20,000 mg KMnO4 …
Occurrence Of Sulfonamide Antimicrobials In Private Water Wells In Washington County, Idaho, Usa, Angela Batt, Daniel Snow, Diana Aga
Occurrence Of Sulfonamide Antimicrobials In Private Water Wells In Washington County, Idaho, Usa, Angela Batt, Daniel Snow, Diana Aga
Daniel D Snow
County (Weiser, Idaho) were collected to assess the impact of a nearby confined animal feeding operation (CAFO) on the quality of the local groundwater. All six samples were found contaminated by two veterinary antimicrobials, sulfamethazine (at concentrations from 0.076 to 0.22 μg/l) and sulfadimethoxine (at concentrations from 0.046 to 0.068 μg/l). These groundwater samples also contained elevated concentrations of nitrate and ammonium. Three of the sampled wells have nitrate levels that exceeded the maximum contaminant level set by the US Environmental Protection Agency for drinking water, with nitrate concentration as high as 39.1 mg/l. All but one well showed nitrate, …
Herbicides In Ground Water Beneath Nebraska’S Management Systems Evaluation Area, Roy F. Spalding, Mary Exner, Daniel Snow, David Cassada, Mark Burbach, Stephen Monson
Herbicides In Ground Water Beneath Nebraska’S Management Systems Evaluation Area, Roy F. Spalding, Mary Exner, Daniel Snow, David Cassada, Mark Burbach, Stephen Monson
Daniel D Snow
Profiles of ground water pesticide concentrations beneath the Nebraska Management Systems Evaluation Area (MSEA) describe the effect of 20 years of pesticide usage on ground water in the central Platte Valley of Nebraska. During the 6-yr (1991–1996) study, 14 pesticides and their transformation products were detected in 7848 ground water samples from the unconfined water table aquifer. Triazine and acetamide herbicides applied on the site and their transformation products had the highest frequencies of detection. Atrazine [6-chloro-N-ethyl-N’-(1-methylethyl)-1,3,5-triazine-2,4,-diamine] concentrations decreased with depth and ground water age determined with 3H/3He dating techniques. Assuming equivalent atrazine …
Transformation Of Hexahydro-1,3,5-Trinitro-1,3,5-Triazine (Rdx) By Permanganate, Chanat Chokejaroenrat, Steven Comfort, Clifford Harris, Daniel Snow, David Cassada, Chainarong Sakulthaew, Tunlawit Satapanajaru
Transformation Of Hexahydro-1,3,5-Trinitro-1,3,5-Triazine (Rdx) By Permanganate, Chanat Chokejaroenrat, Steven Comfort, Clifford Harris, Daniel Snow, David Cassada, Chainarong Sakulthaew, Tunlawit Satapanajaru
Daniel D Snow
The chemical oxidant permanganate (MnO4−) has been shown to effectively transform hexa-hydro-1,3,5-trinitro-1,3,5-triazine (RDX) at both the laboratory and fieldscales. We treated RDX with MnO4− with the objective of quantifying the effects of pH and temperature on destruction kinetics and determining reaction rates. A nitrogen mass balance and the distribution of reaction products were used to provide insight into reaction mechanisms. Kinetic experiments (at pH ~7, 25 °C) verifiedthat RDX−MnO4− reaction was first-order with respect to MnO4− and initial RDX concentration (second-order rate: 4.2 × 10−5 M−1 s−1). Batch experiments showed that choice of quenching agents (MnSO4, MnCO3, and H2O2) influenced …
Field-Scale Cleanup Of Atrazine And Cyanazine Contaminated Soil With A Combined Chemical-Biological Approach, Manmeet Waria, Steven Comfort, Sathaporn Onanong, T. Satapanajaru, Hardiljeet Boparai, C. Harris, Daniel Snow, David Cassada
Field-Scale Cleanup Of Atrazine And Cyanazine Contaminated Soil With A Combined Chemical-Biological Approach, Manmeet Waria, Steven Comfort, Sathaporn Onanong, T. Satapanajaru, Hardiljeet Boparai, C. Harris, Daniel Snow, David Cassada
Daniel D Snow
A former agrichemical dealership in western Nebraska was suspected of having contaminated soil. Our objective was to characterize and remediate the contaminated site by a combined chemical-biological approach. This was accomplished by creating contour maps of the on-site contamination, placing the top 60 cm of contaminated soil in windrows and mixing with a mechanical high-speed mixer. Homogenized soil containing both atrazine [6-chloro-N-ethyl-N´-isopropyl-1,3,5-triazine- 2,4-diamine] and cyanazine {2-[[4-chloro-6-(ethylamino)-1,3,5- triazin-2-yl] amino]-2-methylpropanenitrile} was then used in laboratory investigations to determine optimum treatments for pesticide destruction. Iron suspension experiments verified that zerovalent iron (Fe0) plus ferrous sulfate (FeSO4•7H2O) removed more than 90% of both atrazine …
C60 Oxide As A Key Component Of Aqueous C60 Colloidal Suspensions, Befrika Murdianti, Joshua Damron, Martha Hilburn, Randall Maples, Rangika Hikkaduwa Koralege, Sathish Kuriyavar, Kevin Ausman
C60 Oxide As A Key Component Of Aqueous C60 Colloidal Suspensions, Befrika Murdianti, Joshua Damron, Martha Hilburn, Randall Maples, Rangika Hikkaduwa Koralege, Sathish Kuriyavar, Kevin Ausman
Kevin D. Ausman
Stable aqueous fullerene colloidal suspensions (nC60) are demonstrated to rely on the [6,6]-closed epoxide derivative of the fullerene (C60O) for stability. This derivative is present, though often unrecognized, in small quantities in nearly all C60 starting materials due to a reaction with air. The low-yield formation of nC60 from organic solvent solutions results from a preferential partitioning and thus enrichment of C60O in the colloidal particles. This partitioning is significantly retarded in the nC60 synthesis method that does not involve organic solvent solutions: long-term stirring in water. Instead, this method relies on trace levels of ozone in the ambient atmosphere …