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Articles 631 - 660 of 2377
Full-Text Articles in Physical Sciences and Mathematics
Morphological And Stratigraphic Evolution Of Wandandian Creek Delta, St Georges Basin, New South Wales, Carl Hopley, Brian Jones
Morphological And Stratigraphic Evolution Of Wandandian Creek Delta, St Georges Basin, New South Wales, Carl Hopley, Brian Jones
B. G. Jones
No abstract provided.
Late Quaternary Mega-Lakes Fed By The Northern And Southern River Systems Of Central Australia: Varying Moisture Sources And Increased Continental Aridity, T Cohen, G Nanson, John Jansen, B Jones, Z Jacobs, J Larsen, J.-H May, P Treble, D Price, A Smith
Late Quaternary Mega-Lakes Fed By The Northern And Southern River Systems Of Central Australia: Varying Moisture Sources And Increased Continental Aridity, T Cohen, G Nanson, John Jansen, B Jones, Z Jacobs, J Larsen, J.-H May, P Treble, D Price, A Smith
B. G. Jones
Optically stimulated and thermoluminescence ages from relict shorelines, along with accelerator mass spectrometer 14C ages from freshwater molluscs reveal a record of variable moisture sources supplied by northern and southern river systems to Lake Mega-Frome in southern central Australia during the late Quaternary. Additional lacustrine, palynological and terrestrial proxies are used to reconstruct a record that extends back to 105 ka, confirming that Lakes Mega-Frome and Mega-Eyre were joined to create the largest system of palaeolakes on the Australian continent as recently as 50-47 ka. The palaeohydrological record indicates a progressive shift to more arid conditions, with marked drying after …
Use Of 210pb And 137cs To Simultaneously Constrain Ages And Sources Of Post-Dam Sediments In The Cordeaux Reservoir, Sydney, Australia, Ava Simms, Colin Woodroffe, Brian Jones, H Heijnis, Rob Mann, J. Harrison
Use Of 210pb And 137cs To Simultaneously Constrain Ages And Sources Of Post-Dam Sediments In The Cordeaux Reservoir, Sydney, Australia, Ava Simms, Colin Woodroffe, Brian Jones, H Heijnis, Rob Mann, J. Harrison
B. G. Jones
Environmental radionuclides can be employed as tracers of sediment movement and delivery to water bodies such as lakes and reservoirs. The chronologies of sediments that have accumulated in the Cordeaux reservoir in Sydney, Australia, were determined by the rate of change of 210Pbex with depth and indicate slow accretion in the reservoir. The ratio of enrichment of radionuclides in sediment cores to 210Pbex and 137Cs concentrations in a reference soil sample within the Cordeaux catchment indicates that the dominant source of sediment in the Cordeaux reservoir is surface erosion (detachment and removal of sediment at depths less than 30 cm). …
On The Possible Origins Of An Unusual (Mid To Late Holocene) Coastal Deposit, Old Punt Bay, South-East Australia, Brian Jones, Adam Switzer, S Haslett, Dale Dominey-Howes, D Everett, C Courtney, B Mamo, L Strotz
On The Possible Origins Of An Unusual (Mid To Late Holocene) Coastal Deposit, Old Punt Bay, South-East Australia, Brian Jones, Adam Switzer, S Haslett, Dale Dominey-Howes, D Everett, C Courtney, B Mamo, L Strotz
B. G. Jones
An unusual coarse, shelly sedimentary unit is found elevated above present mean sea level in a sheltered pocket embayment at Old Punt Bay in south-eastern Australia. The coarse sediments, diverse microfauna, and large shelly macrofauna of mixed affinity suggest that the deposit is the result of high-energy deposition. The deposit was previously thought to have been deposited 1000-1300 cal bp based on one shell dated using 14C and amino acid racemisation. However, additional 14C dating indicates a likely age of ~2500 cal bp. Regardless of age constraints, the presence of rock-encrusting oyster shells and large articulated bivalves, suggests that the …
Patterns And Rates Of Sedimentary Infill In The Minnamurra River Estuary, South-Eastern Australia, K Panayotou, Colin Woodroffe, Brian Jones, Bryan Chenhall, Errol Mclean, H Heijnis
Patterns And Rates Of Sedimentary Infill In The Minnamurra River Estuary, South-Eastern Australia, K Panayotou, Colin Woodroffe, Brian Jones, Bryan Chenhall, Errol Mclean, H Heijnis
B. G. Jones
This paper presents a revised process-based model that explores aspects of estuarine geomorphology and the rates and patterns of sedimentary infill based upon the Minnamurra River estuary, a mature barrier estuary in south-eastern Australia. The Minnamurra River is located on the south coast of New South Wales and is characterised by three main facies: a marine flood tide delta/barrier, a central lagoon/estuary and a fluvial delta. The sedimentary record in this system was examined in detail to quantify the rate of estuarine infill. This predominantly infilled mature barrier estuary is now largely dominated by river influence. In the early stages …
Mobility Of Sediment Grain Size Distributions On A Wave Dominated Continental Shelf, Southeastern Australia, Brian Jones, Jonathan Griffin, Mark Hemer
Mobility Of Sediment Grain Size Distributions On A Wave Dominated Continental Shelf, Southeastern Australia, Brian Jones, Jonathan Griffin, Mark Hemer
B. G. Jones
No abstract provided.
Contrasting Sedimentation Rates In Lake Illawarra And St Georges Basin, Two Large Barrier Estuaries On The Southeast Coast Of Australia, Colin Murray-Wallace, Brian Jones, Craig Sloss, H Heijnis, B Brooke
Contrasting Sedimentation Rates In Lake Illawarra And St Georges Basin, Two Large Barrier Estuaries On The Southeast Coast Of Australia, Colin Murray-Wallace, Brian Jones, Craig Sloss, H Heijnis, B Brooke
B. G. Jones
Sedimentation rates over the last 100 years within two lagoons on the southeast coast of Australia, Lake Illawarra and St Georges Basin, have been quantified to determine the effects of catchment land use change and native vegetation clearance on infill rates, and spatial variations in the rate at which the estuaries have filled. Both catchments have similar lake and catchment area but have experience different degrees of modification due to land clearing for agriculture practices, urbanisation and industrialisation. Results indicate that in the heavily modified catchment of Lake Illawarra sedimentation rates close to fluvial deltas can be in excess of …
Reconstructing Recent Sedimentation In Two Urbanised Coastal Lagoons (Nsw, Australia) Using Radioisotopes And Geochemistry, Brian Jones, H Heijnis, J. Harrison, Suzanne Hollins, S Hankin, Atun Zawadzki
Reconstructing Recent Sedimentation In Two Urbanised Coastal Lagoons (Nsw, Australia) Using Radioisotopes And Geochemistry, Brian Jones, H Heijnis, J. Harrison, Suzanne Hollins, S Hankin, Atun Zawadzki
B. G. Jones
In this study, we combined grain size and geochemical analyses with radioisotope analysis of lead-210 (210Pb), caesium-137 (137Cs) and radiocarbon (14C) ages to reconstruct the sedimentation history of two urbanised coastal lagoons in south-east Australia. Towradgi and Fairy Lagoons were both found to exhibit slow initial sedimentation of less than 1 mm year-1 prior to anthropogenic influences. Land clearing in the catchments increased runoff and erosion in the creeks feeding into the estuaries, and has resulted in progradation of fluvial material into the estuarine systems with a marked increase in sedimentation to between 2 and 7 mm year-1. The upper …
The Geomorphology Of The Flanks Of The Lord Howe Island Volcano, Tasman Sea, Australia, D. Kennedy, B. Brooke, Colin Woodroffe, Brian Jones, C. Waikari, S. Nichol
The Geomorphology Of The Flanks Of The Lord Howe Island Volcano, Tasman Sea, Australia, D. Kennedy, B. Brooke, Colin Woodroffe, Brian Jones, C. Waikari, S. Nichol
B. G. Jones
No abstract provided.
Assessing The Recent (1834-2002) Morphological Evolution Of A Rapidly Prograding Delta Within A Gis Framework: Macquarie Rivulet Delta, Lake Illawarra, New South Wales, Marjetta Puotinen, Brian Jones, Carl Hopley
Assessing The Recent (1834-2002) Morphological Evolution Of A Rapidly Prograding Delta Within A Gis Framework: Macquarie Rivulet Delta, Lake Illawarra, New South Wales, Marjetta Puotinen, Brian Jones, Carl Hopley
B. G. Jones
No abstract provided.
Geomorphic Evidence For Mid-Late Holocene Higher Sea Level From Southeastern Australia, Adam Switzer, Craig Sloss, Brian Jones, C. Bristow
Geomorphic Evidence For Mid-Late Holocene Higher Sea Level From Southeastern Australia, Adam Switzer, Craig Sloss, Brian Jones, C. Bristow
B. G. Jones
No abstract provided.
The Holocene Infill Of Lake Conjola, A Narrow Incised Valley System On The Southeast Coast Of Australia, Craig Sloss, Brian Jones, Adam Switzer, Scott Nichol, Alastair Clement, William Nicholas
The Holocene Infill Of Lake Conjola, A Narrow Incised Valley System On The Southeast Coast Of Australia, Craig Sloss, Brian Jones, Adam Switzer, Scott Nichol, Alastair Clement, William Nicholas
B. G. Jones
No abstract provided.
Sea Level, Storm, Or Tsunami: Engimatic Sand Sheet Deposits In A Sheltered Coastal Embayment From Southeastern New South Wales, Australia, Edward Bryant, Brian Jones, Kevin Pucillo, Rabea Haredy, Adam Switzer
Sea Level, Storm, Or Tsunami: Engimatic Sand Sheet Deposits In A Sheltered Coastal Embayment From Southeastern New South Wales, Australia, Edward Bryant, Brian Jones, Kevin Pucillo, Rabea Haredy, Adam Switzer
B. G. Jones
No abstract provided.
The Sedimentary Record Of Palaeoenvironments And Sea-Level Change In The Gulf Of Carpentaria, Australia, Through The Last Glacial Cycle, Jessica Reeves, Allan Chivas, Adriana Garcia, Sabine Holt, Martine Couapel, Brian Jones, Dionisio Cendon, David Fink
The Sedimentary Record Of Palaeoenvironments And Sea-Level Change In The Gulf Of Carpentaria, Australia, Through The Last Glacial Cycle, Jessica Reeves, Allan Chivas, Adriana Garcia, Sabine Holt, Martine Couapel, Brian Jones, Dionisio Cendon, David Fink
B. G. Jones
Environmental evolution of the Gulf of Carpentaria region, the world's largest tropical epicontinental seaway, through the last glacial cycle has been determined from a series of six sediment cores. These cores form the focus of a multi-disciplinary study to elucidate sea level, climate and environmental change in the region. The sedimentary record reveals a series of facies including open shallow marine, marginal marine, estuarine, lacustrine and subaerial exposure, throughout the extent of the basin during this period. The partial or complete closure of the central basin from marine waters results from sea level falling below the height of one or …
Holocene Sea Level Fluctuations And The Sedimentary Evolution Of A Barrier Estuary: Lake Illawarra, New South Wales, Australia, Colin Murray-Wallace, Brian Jones, Craig Sloss, C.E. Mcclennen
Holocene Sea Level Fluctuations And The Sedimentary Evolution Of A Barrier Estuary: Lake Illawarra, New South Wales, Australia, Colin Murray-Wallace, Brian Jones, Craig Sloss, C.E. Mcclennen
B. G. Jones
No abstract provided.
Holocene Evolution Of The Minnamurra River Estuary, Southeast Australia: Foraminiferal Evidence, S. Haslett, R. Davies-Burrows, K. Panayotou, Brian Jones, Colin Woodroffe
Holocene Evolution Of The Minnamurra River Estuary, Southeast Australia: Foraminiferal Evidence, S. Haslett, R. Davies-Burrows, K. Panayotou, Brian Jones, Colin Woodroffe
B. G. Jones
No abstract provided.
Morphological Changes, Assessed Within A Gis Framework, In The Prograding Macquarie Rivulet Delta, New South Wales, Carl Hopley, Brian Jones, Marjetta Puotinen
Morphological Changes, Assessed Within A Gis Framework, In The Prograding Macquarie Rivulet Delta, New South Wales, Carl Hopley, Brian Jones, Marjetta Puotinen
B. G. Jones
No abstract provided.
Identification Of The Permian-Triassic Boundary In The Southern Sydney Basin, Megan Williams, Paul Carr, Brian Jones
Identification Of The Permian-Triassic Boundary In The Southern Sydney Basin, Megan Williams, Paul Carr, Brian Jones
B. G. Jones
No abstract provided.
Setup, Deposition And Sedimentary Characteristics Of Two Storm Overwash Deposits, Abrahams Bosom Beach, Southeastern Australia, Brian Jones, Adam Switzer
Setup, Deposition And Sedimentary Characteristics Of Two Storm Overwash Deposits, Abrahams Bosom Beach, Southeastern Australia, Brian Jones, Adam Switzer
B. G. Jones
No abstract provided.
Ichnological And Sedimentologic Signatures Of Mixed Wave- And Storm-Dominated Deltaic Deposits: Examples From The Early Permian Sydney Basin, Australia, Brian Jones, Stuart Tye, James Maceachern, Kerrie Bann, Christopher Fielding
Ichnological And Sedimentologic Signatures Of Mixed Wave- And Storm-Dominated Deltaic Deposits: Examples From The Early Permian Sydney Basin, Australia, Brian Jones, Stuart Tye, James Maceachern, Kerrie Bann, Christopher Fielding
B. G. Jones
No abstract provided.
Large-Scale Washover Sedimentation In A Freshwater Lagoon From The Southeast Australian Coast: Sea-Level Change, Tsunami Or Exceptionally Large Storm?, Brian Jones, Adam Switzer
Large-Scale Washover Sedimentation In A Freshwater Lagoon From The Southeast Australian Coast: Sea-Level Change, Tsunami Or Exceptionally Large Storm?, Brian Jones, Adam Switzer
B. G. Jones
No abstract provided.
Aminostratigraphy Of Two Holocene Wave-Dominated Barrier Estuaries In Southeastern Australia, Colin Murray-Wallace, Brian Jones, Craig Sloss
Aminostratigraphy Of Two Holocene Wave-Dominated Barrier Estuaries In Southeastern Australia, Colin Murray-Wallace, Brian Jones, Craig Sloss
B. G. Jones
No abstract provided.
Freshwater Recharge Into A Shallow Saline Groundwater System, Cooper Creek Floodplain, Queensland, Australia, Dionisio Cendon, Joshua Larsen, Brian Jones, Gerald Nanson, David Rickleman, S. Hankin, J. Pueyo, Jerry Maroulis
Freshwater Recharge Into A Shallow Saline Groundwater System, Cooper Creek Floodplain, Queensland, Australia, Dionisio Cendon, Joshua Larsen, Brian Jones, Gerald Nanson, David Rickleman, S. Hankin, J. Pueyo, Jerry Maroulis
B. G. Jones
No abstract provided.
Spectroscopic Characterization Of Copper(I) Binding To Apo And Metal-Reconstituted Zinc Finger Peptides, R. Doku, G. Park, K. Wheeler, Kathryn Splan
Spectroscopic Characterization Of Copper(I) Binding To Apo And Metal-Reconstituted Zinc Finger Peptides, R. Doku, G. Park, K. Wheeler, Kathryn Splan
Kathryn E. Splan
No abstract provided.
Ambiguous Optimistic Fair Exchange, Qiong Huang, Guomin Yang, Duncan Wang, Willy Susilo
Ambiguous Optimistic Fair Exchange, Qiong Huang, Guomin Yang, Duncan Wang, Willy Susilo
Dr Guomin Yang
Optimistic fair exchange (OFE) is a protocol for solving the problem of exchanging items or services in a fair manner between two parties, a signer and a verifier, with the help of an arbitrator which is called in only when a dispute happens between the two parties. In almost all the previous work on OFE, after obtaining a partial signature from the signer, the verifier can present it to others and show that the signer has indeed committed itself to something corresponding to the partial signature even prior to the completion of the transaction. In some scenarios, this capability given …
Efficient Optimistic Fair Exchange Secure In The Multi-User Setting And Chosen-Key Model Without Random Oracles, Qiong Huang, Guomin Yang, Duncan Wang, Willy Susilo
Efficient Optimistic Fair Exchange Secure In The Multi-User Setting And Chosen-Key Model Without Random Oracles, Qiong Huang, Guomin Yang, Duncan Wang, Willy Susilo
Dr Guomin Yang
Optimistic fair exchange is a kind of protocols to solve the problem of fair exchange between two parties. Almost all the previous work on this topic are provably secure only in the random oracle model. In PKC 2007, Dodis et al. considered optimistic fair exchange in a multiuser setting, and showed that the security of an optimistic fair exchange in a single-user setting may no longer be secure in a multi-user setting. Besides, they also proposed one and reviewed several previous construction paradigms and showed that they are secure in the multi-user setting. However, their proofs are either in the …
Conditional And Unconditional Models In Model-Assisted Estimation Of Finite Population Totals, David Steel, Robert Clark
Conditional And Unconditional Models In Model-Assisted Estimation Of Finite Population Totals, David Steel, Robert Clark
Professor David Steel
The well known Godambe-Joshi lower bound for the anticipated variance of design unbiased estimators of population totals treats the auxiliary variables as constants. We extend the result to models where these variables are random and show that the generalized difference estimator using the expected values conditional on all auxiliary values is optimal. This has several implications including the fact that collecting multiple survey variables does not reduce the lower bound.
Scales, Levels And Processes: Studying Spatial Patterns Of British Census Variables, David Manley, Robin Flowerdew, David Steel
Scales, Levels And Processes: Studying Spatial Patterns Of British Census Variables, David Manley, Robin Flowerdew, David Steel
Professor David Steel
No abstract provided.
Adaptive Inference For Multi-Stage Survey Data, Loai Alzoubi, Robert Clark, David Steel
Adaptive Inference For Multi-Stage Survey Data, Loai Alzoubi, Robert Clark, David Steel
Professor David Steel
Multi-level models can be used to account for clustering in data from multi-stage surveys. In some cases, the intraclass correlation may be close to zero, so that it may seem reasonable to ignore clustering and fit a single-level model. This article proposes several adaptive strategies for allowing for clustering in regression analysis of multi-stage survey data. The approach is based on testing whether the PSU-level variance component is zero. If this hypothesis is retained, then variance estimates are calculated ignoring clustering; otherwise, clustering is reflected in variance estimation. A simple simulation study is used to evaluate the various procedures.
Measuring And Analysing Homogeneity Of Geographical Areas For A Categorical Variable, David Steel, Mark Tranmer
Measuring And Analysing Homogeneity Of Geographical Areas For A Categorical Variable, David Steel, Mark Tranmer
Professor David Steel
Many Variables have within group homogeneity (similarity of values for the individual units that comprise the groups). Measures of within group homogeneity are useful for the sample design and statistical analysis of datasets for populations that contain groups, such as individuals in geographical areas. Homogeneity measures can easily be defined for continuous or dichotomous variables. Here we propose a homogeneity measure for a multi-category variable and show how this measure can be calculated without access to individual level data. We apply the measure to data from the UK census and show how this measure can be related to the homogeneity …