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Articles 1711 - 1740 of 2377
Full-Text Articles in Physical Sciences and Mathematics
Effects Of Diffusion And Resuspension On Nutrient Release From Submerged Sediments, Ian Phillips, Edward Burton, Darryl Hawker
Effects Of Diffusion And Resuspension On Nutrient Release From Submerged Sediments, Ian Phillips, Edward Burton, Darryl Hawker
Associate Professor Edward D Burton
Nutrient release from a coarse-sand (CS) and a fine-sand (FS) estuarine sediment into the overlying water column was studied under static (diffusion-controlled) and dynamic (resuspension) conditions. Resuspension increased the amounts of NH4+, NO3- and P released from the sediment cores compared to those released by diffusion alone due to direct release of these nutrients from the readily available pore-water and ion exchange fractions. The average effective NH4+, NO3- and P diffusion coefficients (De) were found to be similar for both sediments, and did not vary significantly between static and dynamic conditions. Values of De were typically of the order of …
Effects Of Ph And Salinity On Copper, Lead And Zinc Sorption Rates In Sediments From Moreton Bay, Australia, Ian Phillips, Dane Lamb, Darryl Hawker, Edward Burton
Effects Of Ph And Salinity On Copper, Lead And Zinc Sorption Rates In Sediments From Moreton Bay, Australia, Ian Phillips, Dane Lamb, Darryl Hawker, Edward Burton
Associate Professor Edward D Burton
No abstract provided.
Schwertmannite Transformation To Goethite Via The Fe(Ii) Pathway: Reaction Rates And Implications For Iron-Sulfide Formation, Edward Burton, Richard Bush, Leigh Sullivan, David Mitchell
Schwertmannite Transformation To Goethite Via The Fe(Ii) Pathway: Reaction Rates And Implications For Iron-Sulfide Formation, Edward Burton, Richard Bush, Leigh Sullivan, David Mitchell
Associate Professor Edward D Burton
Schwertmannite (Fe8O8(OH)6SO4) is a common Fe(III)-oxyhydroxysulfate mineral in acid-sulfate systems, where its formation and fate strongly influence water quality. The present study examines transformation of schwertmannite to goethite (FeOOH), as catalyzed by interactions with Fe(II) in anoxic aquatic environments. This study also evaluates the role of the Fe(II) pathway in influencing the formation of iron–sulfide minerals in such environments. At pH > 5, the rates of Fe(II)-catalyzed schwertmannite transformation were several orders of magnitude faster than transformation in the absence of Fe(II). Complete transformation of schwertmannite occurred within only 3–5 h at pH > 6 and Fe(II)(aq) 5 mmol L−1. Model calculations …
Trace Metals And Nutrients In Bottom Sediments Of The Southport Broadwater, Australia, Edward Burton, Ian Phillips, Darryl Hawker
Trace Metals And Nutrients In Bottom Sediments Of The Southport Broadwater, Australia, Edward Burton, Ian Phillips, Darryl Hawker
Associate Professor Edward D Burton
No abstract provided.
Estimating Sludge Loadings To Land Based On Trace Metal Sorption In Soil: Effect Of Dissolved Organo-Metallic Complexes, Edward Burton, Darryl Hawker, M Redding
Estimating Sludge Loadings To Land Based On Trace Metal Sorption In Soil: Effect Of Dissolved Organo-Metallic Complexes, Edward Burton, Darryl Hawker, M Redding
Associate Professor Edward D Burton
This paper describes the results of research examining the effect of dissolved organo-metallic complexes of copper (Cu) and zinc (Zn) from sewage sludge leachate on sorption by a humic-gley soil A-horizon, and the influence of such complexes on resultant sludge loading estimates. Sorption was described with Linear, Freundlich or Langmuir equations, and compared between a sample of sludge leachate (containing 97.4% of Cu and 63.2% of Zn as dissolved organo-metallic complexes) and a reference solution (which mimicked the leachate, except for a lack of dissolved organic material). This comparison revealed that dissolved organo-metallic complexes significantly depressed Cu and Zn sorption …
A Microwave Digestion Technique For The Extraction Of Fossil Diatoms From Coastal Lake And Swamp Sediments, Jeffrey Parr, Kathryn Taffs, Christopher Lane
A Microwave Digestion Technique For The Extraction Of Fossil Diatoms From Coastal Lake And Swamp Sediments, Jeffrey Parr, Kathryn Taffs, Christopher Lane
Jeffrey Parr
This study provides an introduction to a microwave digestion technique for the extraction of fossil diatoms from sediments. The microwave technique is compared with the standard diatom extraction technique of Battarbee (Diatom analysis. In: Berglund B.E. (ed.), Handbook of Holocene Palaeoecology and Palaeohydrology. John Wiley and Sons) that uses a combination of dilute hydrochloric acid and hydrogen peroxide and the advantages and disadvantages of their use are discussed. The results suggest that the microwave technique is fast, inexpensive and most importantly produces replicable fossil diatom assemblage data. Small samples sizes are used (0.3 g) for the microwave method thus lower …
Fires And Their Implications For Acidic Peatlands, Northeastern Nsw, Jeffrey Parr, Kathryn Taffs, Geoffrey Kerr, J Arthur
Fires And Their Implications For Acidic Peatlands, Northeastern Nsw, Jeffrey Parr, Kathryn Taffs, Geoffrey Kerr, J Arthur
Jeffrey Parr
No abstract provided.
Interactions Between Human Activity, Volcanic Eruptions And Vegetation During The Holocene At Garua And Numundo, West New Britain, Png, William Boyd, Carol Lentfer, Jeffrey Parr
Interactions Between Human Activity, Volcanic Eruptions And Vegetation During The Holocene At Garua And Numundo, West New Britain, Png, William Boyd, Carol Lentfer, Jeffrey Parr
Jeffrey Parr
This paper reviews recent fossil phytolith analysis from wet tropical West New Britain (Papua New Guinea). The Holocene vegetation has been influenced by spatially and temporally diverse patterns of both prehistoric human settlement and catastrophic volcanic events. We have hypothesized different landscape responses and recovery pathways to events during the last six millennia. Phytolith sequences on the coastal lowlands, the Willaumez Peninsula, and nearby island of Garua provide details of vegetational change and human interactions at different landscape scales since c. 5900 cal yr B.P. During this period four major volcanic eruptions (c. 5900, 3600, 1700 and 1400 cal yr …
Chronology And Palaeoecology Of An Acidic Wetland Peat In Northeastern Nsw, Kathryn Taffs, Jeffrey Parr, Keith Bolton
Chronology And Palaeoecology Of An Acidic Wetland Peat In Northeastern Nsw, Kathryn Taffs, Jeffrey Parr, Keith Bolton
Jeffrey Parr
No abstract provided.
Reconstructing Fire Histories: Methods, Interpretation And Common On-Ground Across Fire History Research In Australia, Jeffrey Parr, Geoffrey Kerr, J Arthur, Keith Bolton, Geraldine Jacobsen, Kathryn Taffs
Reconstructing Fire Histories: Methods, Interpretation And Common On-Ground Across Fire History Research In Australia, Jeffrey Parr, Geoffrey Kerr, J Arthur, Keith Bolton, Geraldine Jacobsen, Kathryn Taffs
Jeffrey Parr
No abstract provided.
Response To Cotter And Cotter: Confirming The Probable Industrial Origin Of Archaeological Daub At An Iron Age Site In Northeast Thailand, William Boyd, Jeffrey Parr
Response To Cotter And Cotter: Confirming The Probable Industrial Origin Of Archaeological Daub At An Iron Age Site In Northeast Thailand, William Boyd, Jeffrey Parr
Jeffrey Parr
No abstract provided.
Fires Impact On An Acidic Peatland In Northeastern Nsw: Implications For The Interpretation Of Fire Histories, Pyrite Formation And Loss Of Organic Carbon, Jeffrey Parr, Geoffrey Kerr, J Arthur, Kathryn Taffs
Fires Impact On An Acidic Peatland In Northeastern Nsw: Implications For The Interpretation Of Fire Histories, Pyrite Formation And Loss Of Organic Carbon, Jeffrey Parr, Geoffrey Kerr, J Arthur, Kathryn Taffs
Jeffrey Parr
No abstract provided.
West Byron Wetland Vegetation History Report., Jeffrey Parr, Kathryn Taffs
West Byron Wetland Vegetation History Report., Jeffrey Parr, Kathryn Taffs
Jeffrey Parr
No abstract provided.
The Primary Noise Sources Associated With Turbulent Coanda Wall Jets, Caroline Lubert
The Primary Noise Sources Associated With Turbulent Coanda Wall Jets, Caroline Lubert
Caroline P Lubert
No abstract provided.
Lecture 5, Shuangge Ma
Final Project, Shuangge Ma
Lecture 4, Shuangge Ma
Lecture 4, Shuangge Ma
Computer Intensive Methods Lecture 13, Shuangge Ma
Final Project (Description), Shuangge Ma
Final Project (Data), Shuangge Ma
Lecture 3, Shuangge Ma
Hadronic Parity Violation And Effective Field Theory, Br Holstein
Hadronic Parity Violation And Effective Field Theory, Br Holstein
Barry R Holstein
The history and phenomenology of hadronic parity violation is reviewed and a new modelindependent approach based on effective field theory is developed. Possible future developments are discussed.
Lecture 2, Shuangge Ma
Reference: Multiple Imputation, Shuangge Ma
Reference: Weighted Bootstrap, Shuangge Ma
Computer Intensive Methods Lecture 9, Shuangge Ma
Computer Intensive Methods Lecture 8, Shuangge Ma
Reference: Counter Examples [Bootstrap], Shuangge Ma
Reference: Counter Examples [Bootstrap], Shuangge Ma
Shuangge Ma
No abstract provided.
Computer Intensive Methods Lecture 7 (Lab 2), Shuangge Ma
Computer Intensive Methods Lecture 7 (Lab 2), Shuangge Ma
Shuangge Ma
No abstract provided.