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Articles 691 - 720 of 2377
Full-Text Articles in Physical Sciences and Mathematics
Genesee River Watershed Project. Water Quality Analysis Of The Oatka Creek Watershed. Volume 6. Nutrient Concentration And Loading, Identification Of Point And Nonpoint Sources Of Pollution, Total Maximum Daily Load, And An Assessment Of Management Practices Using The Soil Water Assessment Tool (Swat) Model. A Report To The Usda., Dale Pettenski, Joseph Makarewicz, Theodore Lewis
Genesee River Watershed Project. Water Quality Analysis Of The Oatka Creek Watershed. Volume 6. Nutrient Concentration And Loading, Identification Of Point And Nonpoint Sources Of Pollution, Total Maximum Daily Load, And An Assessment Of Management Practices Using The Soil Water Assessment Tool (Swat) Model. A Report To The Usda., Dale Pettenski, Joseph Makarewicz, Theodore Lewis
Joseph C Makarewicz
Oatka Creek is the second largest tributary of the Genesee River and is a highly prized trout fishery. The Oatka Creek portion of the Genesee River Project Study focused on identifying nonpoint and point sources, locating and quantifying the nutrient and sediment losses from Oatka Creek watershed, and through simulation identifying possible remediation or management practices. To accomplish this task, a multifaceted, integrated approach was taken by combining stream monitoring, segment analysis, and hydrologic modeling [Soil and Water Assessment Tool (SWAT)]. Runoff from nonpoint sources (Confined Animal Feeding Operation sites, agricultural practices, and urban areas) and point sources (wastewater treatment …
Underestimation Of Retained Acidity Measured Using Chromium Suite In Acid Sulfate Soils Containing Schwermannite And Jarosite, Chamindra Vithana, Leigh Sullivan, Richard Bush, Edward Burton
Underestimation Of Retained Acidity Measured Using Chromium Suite In Acid Sulfate Soils Containing Schwermannite And Jarosite, Chamindra Vithana, Leigh Sullivan, Richard Bush, Edward Burton
Associate Professor Edward D Burton
No abstract provided.
Hydro-Geochemical Coupling In Seawater Inundation Acid Sulfate Soils: Mobilisation Of Arsenic And Hysteresis In Iron And Sulfur Cycling, Scott Johnston, Annabelle Keene, Edward Burton, Richard Bush, Leigh Sullivan
Hydro-Geochemical Coupling In Seawater Inundation Acid Sulfate Soils: Mobilisation Of Arsenic And Hysteresis In Iron And Sulfur Cycling, Scott Johnston, Annabelle Keene, Edward Burton, Richard Bush, Leigh Sullivan
Associate Professor Edward D Burton
A large-scale field trial indicates that tidal seawater inundation of coastal acid sulfate soils (CASS) stimulates iron and sulfate reducing conditions, leading to the generation of internal alkalinity and greatly decreasing soil / groundwater acidity. This remediation technique can be considered highly effective from the relatively narrow perspective of decreasing acidity and raising pH. However, a broader perspective reveals that tidal seawater inundation initiates complex and tightly coupled hydrological and geochemical processes within sediments and porewaters. These processes have had a profound effect on the mobilisation, redistribution and transformation of Fe minerals in the landscape (Johnston et al., 2011a) – …
Consumer Driven Innovation Management, Arcot Desai Narasimhalu, Shekhar Mitra
Consumer Driven Innovation Management, Arcot Desai Narasimhalu, Shekhar Mitra
Arcot Desai NARASIMHALU
The evolution of human society leads to increased affluence and prosperity of certain populations, sometimes at the expense of well-established markets. Market leaders in products and services tend to be so focused on their current customer base that they are caught off guard with the changes in markets created by the evolution. These changes often go unnoticed until it is too late. The change in customer base often requires the repositioning of products and services through innovations, which address new and emerging markets. Some of these changes could potentially result in tectonic market shifts that force innovation managers to involve …
F-Trail: Finding Patterns In Taxi Trajectories, Yasuko Matsubara, Evangelos Papalexakis, Lei Li, David Lo, Yasushi Sakurai, Christos Faloutsos
F-Trail: Finding Patterns In Taxi Trajectories, Yasuko Matsubara, Evangelos Papalexakis, Lei Li, David Lo, Yasushi Sakurai, Christos Faloutsos
David LO
Given a large number of taxi trajectories, we would like to find interesting and unexpected patterns from the data. How can we summarize the major trends, and how can we spot anomalies? The analysis of trajectories has been an issue of considerable interest with many applications such as tracking trails of migrating animals and predicting the path of hurricanes. Several recent works propose methods on clustering and indexing trajectories data. However, these approaches are not especially well suited to pattern discovery with respect to the dynamics of social and economic behavior. To further analyze a huge collection of taxi trajectories, …
A Comparative Study Of Supervised Learning Algorithms For Re-Opened Bug Prediction, Xin Xia, David Lo, Xinyu Wang, Xiaohu Yang, Shanping Li, Jianling Sun
A Comparative Study Of Supervised Learning Algorithms For Re-Opened Bug Prediction, Xin Xia, David Lo, Xinyu Wang, Xiaohu Yang, Shanping Li, Jianling Sun
David LO
Bug fixing is a time-consuming and costly job which is performed in the whole life cycle of software development and maintenance. For many systems, bugs are managed in bug management systems such as Bugzilla. Generally, the status of a typical bug report in Bugzilla changes from new to assigned, verified and closed. However, some bugs have to be reopened. Reopened bugs increase the software development and maintenance cost, increase the workload of bug fixers, and might even delay the future delivery of a software. Only a few studies investigate the phenomenon of reopened bug reports. In this paper, we evaluate …
An Empirical Study On Developer Interactions In Stackoverflow, Shaowei Wang, David Lo, Lingxiao Jiang
An Empirical Study On Developer Interactions In Stackoverflow, Shaowei Wang, David Lo, Lingxiao Jiang
David LO
No abstract provided.
Creating Trading Systems With Fundamental Variables And Neural Networks: The Aby Case Study, Bruce Vanstone, Gavin Finnie, Tobias Hahn
Creating Trading Systems With Fundamental Variables And Neural Networks: The Aby Case Study, Bruce Vanstone, Gavin Finnie, Tobias Hahn
Bruce Vanstone
No abstract provided.
Creating Trading Systems With Fundamental Variables And Neural Networks: The Aby Case Study, Bruce Vanstone, Gavin Finnie, Tobias Hahn
Creating Trading Systems With Fundamental Variables And Neural Networks: The Aby Case Study, Bruce Vanstone, Gavin Finnie, Tobias Hahn
Tobias Hahn
No abstract provided.
Systems Supportability And Logistics Challenges Of The Boko Bed Net Project, M. Brown, G. Neugebauer, C. Richesin, Caroline Lubert
Systems Supportability And Logistics Challenges Of The Boko Bed Net Project, M. Brown, G. Neugebauer, C. Richesin, Caroline Lubert
Caroline P Lubert
No abstract provided.
Progress In Optical Dating Of Guano-Rich Sediments Associated With The Deep Skull, West Mouth Of The Great Cave Of Niah, Sarawak, Borneo, Mark Stephens, Richard Roberts, O Lian, Hiroyuki Yoshida
Progress In Optical Dating Of Guano-Rich Sediments Associated With The Deep Skull, West Mouth Of The Great Cave Of Niah, Sarawak, Borneo, Mark Stephens, Richard Roberts, O Lian, Hiroyuki Yoshida
Richard G Roberts
The West Mouth of the Great Cave of Niah is one of the major archaeological sites in Southeast Asia; the radiocarbon chronology of this site currently places the earliest presence of Homo sapiens (a Deep Skull find) in Southeast Asia at about 45 ka BP. An optical dating programme using sand-sized quartz was initiated in the West Mouth to complement the radiocarbon chronology. This paper reports on the progress in dating a key sample (sample 376r) that was taken from deposits containing the Deep Skull. A somewhat novel procedure was developed to separate and clean quartz grains from the unusual …
Further Evidence For Small-Bodied Hominins From The Late Pleistocene Of Flores Indonesia, Michael Morwood, P. Brown, Jatmiko, T. Sutikna, E.W. Saptomo, Kira Westaway, R. A. Due, Richard Roberts, T Maeda, S Wasisto, T Djubiantono
Further Evidence For Small-Bodied Hominins From The Late Pleistocene Of Flores Indonesia, Michael Morwood, P. Brown, Jatmiko, T. Sutikna, E.W. Saptomo, Kira Westaway, R. A. Due, Richard Roberts, T Maeda, S Wasisto, T Djubiantono
Richard G Roberts
Homo floresiensis was recovered from Late Pleistocene deposits on the island of Flores in eastern Indonesia, but has the stature, limb proportions and endocranial volume of African Pliocene Australopithecus 1. The holotype of the species (LB1), excavated in 2003 from Liang Bua, consisted of a partial skeleton minus the arms. Here we describe additional H. floresiensis remains excavated from the cave in 2004. These include arm bones belonging to the holotype skeleton, a second adult mandible, and postcranial material from other individuals. We can now reconstruct the body proportions of H. floresiensis with some certainty. The finds further demonstrate …
Sediment Mixing At Nonda Rock: Investigations Of Stratigraphic Integrity At An Early Archaeological Site In Northern Australia And Implications For The Human Colonisation Of The Continent, Richard Roberts, C White, L K Fifield, Christian Turney, M Bird, John Tibby, Bruno David, John Magee, Jerome Mialanes
Sediment Mixing At Nonda Rock: Investigations Of Stratigraphic Integrity At An Early Archaeological Site In Northern Australia And Implications For The Human Colonisation Of The Continent, Richard Roberts, C White, L K Fifield, Christian Turney, M Bird, John Tibby, Bruno David, John Magee, Jerome Mialanes
Richard G Roberts
No abstract provided.
Holocene Palaeofire Records In A High-Level, Proximal Valley-Fill (Wilson Bog), Mount Lofty Ranges, South Australia, Solomon Buckman, Katherine Brownlie, Robert Bourman, C. Murray-Wallace, Rowena Morris, Terry Lachlan, Richard Roberts, Lee Arnold, J. Cann
Holocene Palaeofire Records In A High-Level, Proximal Valley-Fill (Wilson Bog), Mount Lofty Ranges, South Australia, Solomon Buckman, Katherine Brownlie, Robert Bourman, C. Murray-Wallace, Rowena Morris, Terry Lachlan, Richard Roberts, Lee Arnold, J. Cann
Richard G Roberts
No abstract provided.
Times Of Sand: Sedimentary History And Archaeology At The Sigatoka Dunes, Fiji, Richard Roberts, Geoffrey Hope, Antoine De Biran, Patrick Nunn, Atholl Anderson, William Dickinson, David Burley, Geoffrey Clark
Times Of Sand: Sedimentary History And Archaeology At The Sigatoka Dunes, Fiji, Richard Roberts, Geoffrey Hope, Antoine De Biran, Patrick Nunn, Atholl Anderson, William Dickinson, David Burley, Geoffrey Clark
Richard G Roberts
No abstract provided.
Equivalent Dose Distributions From Single Grains Of Quartz At Sibudu, South Africa: Context, Causes And Consequences For Optical Dating Of Archaeological Deposits, Richard Roberts, Zenobia Jacobs, Geoffrey Duller, Ann Wintle
Equivalent Dose Distributions From Single Grains Of Quartz At Sibudu, South Africa: Context, Causes And Consequences For Optical Dating Of Archaeological Deposits, Richard Roberts, Zenobia Jacobs, Geoffrey Duller, Ann Wintle
Richard G Roberts
No abstract provided.
Mammalian Responses To Pleistocene Climate Change In Southeastern Australia, Richard Roberts, Jonathon Olley, John Hellstrom, Dirk Megirian, Gavin Prideaux, Kira Westaway
Mammalian Responses To Pleistocene Climate Change In Southeastern Australia, Richard Roberts, Jonathon Olley, John Hellstrom, Dirk Megirian, Gavin Prideaux, Kira Westaway
Richard G Roberts
No abstract provided.
Late-Surviving Megafauna In Tasmania Australia, Implicate Human Involvement In Their Extinction, Christian Turney, T Flannery, Richard Roberts, Craig Reid, Keith Fifield, T Higham, Zenobia Jacobs, Noel Kemp, Eric Colhoun, R.M. Kalin
Late-Surviving Megafauna In Tasmania Australia, Implicate Human Involvement In Their Extinction, Christian Turney, T Flannery, Richard Roberts, Craig Reid, Keith Fifield, T Higham, Zenobia Jacobs, Noel Kemp, Eric Colhoun, R.M. Kalin
Richard G Roberts
Establishing the cause of past extinctions is critical if we are to understand better what might trigger future occurrences and how to prevent them. The mechanisms of continental late Pleistocene megafaunal extinction, however, are still fiercely contested. Potential factors contributing to their demise include climatic change, human impact, or some combination. On the Australian mainland, 90% of the megafauna became extinct by ≈46 thousand years (ka) ago, soon after the first archaeological evidence for human colonization of the continent. Yet, on the neighboring island of Tasmania (which was connected to the mainland when sea levels were lower), megafaunal extinction appears …
Evolutionary Anthropology - Homo 'Incendius', Richard Roberts, Michael Bird
Evolutionary Anthropology - Homo 'Incendius', Richard Roberts, Michael Bird
Richard G Roberts
Humans have long been captivated by the flickering flames of the campfire. But when did our ancestors first master the use of fire, and which ancient human species was the first to do so? In Proceedings of the National Academy of Sciences, Berna and colleagues1 report that they have found fragments of burnt bone and ashed plants in one-million-year-old sediments at Wonderwerk Cave, Northern Cape province, South Africa. This evidence of fire occurs in the same sedimentary layers as Acheulian stone tools, usually considered the handiwork of Homo erectus. Their discovery more than doubles the accepted antiquity of the habitual …
The Cyrenaican Prehistory Project 2008: The Second Season Of Investigations Of The Haua Fteah Cave And Its Landscape, And Further Results From The Initial (2007) Fieldwork, Richard Roberts, Zenobia Jacobs, Johnny Morales, M. Morley, R. Grun, L Farr, C Hunt, G Barker, R Rabett, T Reynolds, Victoria Leitch, Robyn Inglis, Roisin Hamilton, John Davison, Hwedi El-Rishi, Alex Pryor, David Simpson, Marijke Van Der Veen, Chris Stimpson, Steven Pawley, Mohammed Touati, Caroline Cartwright, Franca Cole, Iain Morley, Lucilla Burn, Ian Brooks, Laura Basell
The Cyrenaican Prehistory Project 2008: The Second Season Of Investigations Of The Haua Fteah Cave And Its Landscape, And Further Results From The Initial (2007) Fieldwork, Richard Roberts, Zenobia Jacobs, Johnny Morales, M. Morley, R. Grun, L Farr, C Hunt, G Barker, R Rabett, T Reynolds, Victoria Leitch, Robyn Inglis, Roisin Hamilton, John Davison, Hwedi El-Rishi, Alex Pryor, David Simpson, Marijke Van Der Veen, Chris Stimpson, Steven Pawley, Mohammed Touati, Caroline Cartwright, Franca Cole, Iain Morley, Lucilla Burn, Ian Brooks, Laura Basell
Richard G Roberts
No abstract provided.
New Excavations Of Middle Stone Age Deposits At Apollo 11 Rockshelter, Namibia: Stratigraphy, Archaeology, Chronology And Past Environments, Ralf Vogelsang, Jurgen Richter, Zenobia Jacobs, Barbara Eichhorn, Veerle Linseele, Richard Roberts
New Excavations Of Middle Stone Age Deposits At Apollo 11 Rockshelter, Namibia: Stratigraphy, Archaeology, Chronology And Past Environments, Ralf Vogelsang, Jurgen Richter, Zenobia Jacobs, Barbara Eichhorn, Veerle Linseele, Richard Roberts
Richard G Roberts
This paper presents new information obtained from a recent excavation and reassessment of the stratigraphy, chronology, archaeological assemblages and environmental context of the Apollo 11 rockshelter, which contains the longest late Pleistocene and Holocene archaeological sequence in Namibia. The Middle Stone Age (MSA) industries represented at the site include an early MSA, Still Bay, Howieson's Poort and late MSA. Optically stimulated luminescence (OSL) dating of individual quartz grains yielded numerical ages for the Still Bay and Howieson's Poort, and indicated the presence of a post-Howieson's Poort phase. OSL dating also verified conventional and accelerator mass spectrometry radiocarbon ages for a …
Single-Grain Osl Dating Of Glaciofluvial Quartz Constrains Reid Glaciation In Nw Canada To Mis 6, Martina Demuro, D Froese, Lee Arnold, Richard Roberts
Single-Grain Osl Dating Of Glaciofluvial Quartz Constrains Reid Glaciation In Nw Canada To Mis 6, Martina Demuro, D Froese, Lee Arnold, Richard Roberts
Richard G Roberts
Improved chronological control on the penultimate advance of the Cordilleran Ice Sheet in northwest Canada (the Reid glaciation) is required for a better understanding of late Quaternary palaeoclimatic and palaeoenvironmental change in eastern Beringia. However, reliable dating of glaciation events beyond the last glacial maximum is commonly hindered by a lack of directly dateable material. In this study we (i) provide the first combined minimum and maximum age constraint on the Reid glaciation at Ash Bend, its reference locale in the Stewart River valley, northwestern Canadian Cordillera, using single-grain optically stimulated luminescence dating of quartz; and (ii) compare the timing …
Optical Dating Of Perennially Frozen Deposits Associated With Preserved Ancient Plant And Animal Dna In North-Central Siberia, Richard Roberts, Lee Arnold, F Brock, E Willerslev, A Tikhonov, R Macphee
Optical Dating Of Perennially Frozen Deposits Associated With Preserved Ancient Plant And Animal Dna In North-Central Siberia, Richard Roberts, Lee Arnold, F Brock, E Willerslev, A Tikhonov, R Macphee
Richard G Roberts
No abstract provided.
Ancient Dna Reveals Late Survival Of Mammoth And Horse In Interior Alaska, James Haile, D. Froese, R. Macphee, Richard Roberts, Lee Arnold, Alberto Reyes, Morten Rasmussen, Rasmus Nielsen, Barry Brook, Simon Robinson, Martina Demuro, M. Gilbert, Kasper Munch, Jeremy Austin, Alan Cooper, Ian Barnes, Per Moller, E. Willerslev
Ancient Dna Reveals Late Survival Of Mammoth And Horse In Interior Alaska, James Haile, D. Froese, R. Macphee, Richard Roberts, Lee Arnold, Alberto Reyes, Morten Rasmussen, Rasmus Nielsen, Barry Brook, Simon Robinson, Martina Demuro, M. Gilbert, Kasper Munch, Jeremy Austin, Alan Cooper, Ian Barnes, Per Moller, E. Willerslev
Richard G Roberts
No abstract provided.
Astronomically Calibrated 40ar/39ar Age For The Toba Supereruption And Global Synchronization Of Late Quaternary Records, Michael Storey, Richard Roberts, Mokhtar Saidin
Astronomically Calibrated 40ar/39ar Age For The Toba Supereruption And Global Synchronization Of Late Quaternary Records, Michael Storey, Richard Roberts, Mokhtar Saidin
Richard G Roberts
The Toba supereruption in Sumatra, ∼74 thousand years (ka) ago, was the largest terrestrial volcanic event of the Quaternary. Ash and sulfate aerosols were deposited in both hemispheres, forming a time-marker horizon that can be used to synchronize late Quaternary records globally. A precise numerical age for this event has proved elusive, with dating uncertainties larger than the millennial-scale climate cycles that characterized this period. We report an astronomically calibrated (40)Ar/(39)Ar age of 73.88 ± 0.32 ka (1σ, full external errors) for sanidine crystals extracted from Toba deposits in the Lenggong Valley, Malaysia, 350 km from the eruption source and …
Ages For The Middle Stone Age Of Southern Africa: Implications For Human Behavior And Dispersal, Zenobia Jacobs, Richard Roberts, Rex Galbraith, Hilary Deacon, Rainer Grun, Alex Mackay, Peter Mitchell, Ralf Vogelsang, Lyn Wadley
Ages For The Middle Stone Age Of Southern Africa: Implications For Human Behavior And Dispersal, Zenobia Jacobs, Richard Roberts, Rex Galbraith, Hilary Deacon, Rainer Grun, Alex Mackay, Peter Mitchell, Ralf Vogelsang, Lyn Wadley
Richard G Roberts
The expansion of modern human populations in Africa 80,000 to 60,000 years ago and their initial exodus out of Africa have been tentatively linked to two phases of technological and behavioral innovation within the Middle Stone Age of southern Africa—the Still Bay and Howieson's Poort industries—that are associated with early evidence for symbols and personal ornaments. Establishing the correct sequence of events, however, has been hampered by inadequate chronologies. We report ages for nine sites from varied climatic and ecological zones across southern Africa that show that both industries were short-lived (5000 years or less), separated by about 7000 years, …
Dating In Landscape, Archaeology, Richard Roberts, Zenobia Jacobs
Dating In Landscape, Archaeology, Richard Roberts, Zenobia Jacobs
Richard G Roberts
A common need in archaeology is for objects and events of interest to be dated, so that they can be arranged in the correct temporal sequence. Here we briefly review several methods available to the archaeologist to assist in age determination of the "target" object or event-comprehensive treatments of the subject are given by Aitken 0990, 1999), Wagner (998), and Walker (2005).
A High-Resolution Record Of Vegetation And Climate Through The Last Glacial Cycle From Caledonia Fen, Southeastern Highlands Of Australia, A Kershaw, G Mckenzie, N Porch, Richard Roberts, J Browne, H Heijnis, M Orr, Geraldine Jacobsen, P Newall
A High-Resolution Record Of Vegetation And Climate Through The Last Glacial Cycle From Caledonia Fen, Southeastern Highlands Of Australia, A Kershaw, G Mckenzie, N Porch, Richard Roberts, J Browne, H Heijnis, M Orr, Geraldine Jacobsen, P Newall
Richard G Roberts
A blocked tributary has provided a rare site of long-term sediment accumulation in montane southeastern Australia. This site has yielded a continuous, detailed pollen record through the last ca. 140 000 years and revealed marked vegetation and environmental changes at orbital to sub-millennial scales. Radiocarbon and optically stimulated luminescence (OSL, or optical) ages provide some chronological control for the last ca. 70 000 years. Most of the sediment is inorganic but with well preserved pollen that accumulated under unproductive and probably largely ice-covered lake conditions. The lake was surrounded by low-growing plants with an alpine character. Exceptions include three discrete …
An Improved Osl Chronology For The Still Bay Layers At Blombos Cave, South Africa: Further Tests Of Single-Grain Dating Procedures And A Re-Evaluation Of The Timing Of The Still Bay Industry Across Southern Africa, Zenobia Jacobs, Elspeth Hayes, Richard Roberts, Rex Galbraith, Christopher Henshilwood
An Improved Osl Chronology For The Still Bay Layers At Blombos Cave, South Africa: Further Tests Of Single-Grain Dating Procedures And A Re-Evaluation Of The Timing Of The Still Bay Industry Across Southern Africa, Zenobia Jacobs, Elspeth Hayes, Richard Roberts, Rex Galbraith, Christopher Henshilwood
Richard G Roberts
This paper presents a series of new single-grain optically stimulated luminescence (OSL) ages for the Still Bay at Blombos Cave, South Africa, and compares them to previously published OSL, thermoluminescence (TL) and electron-spin resonance (ESR) ages for this site. Details are provided about the measurement and analytical procedures, including a discussion of the characteristics of the OSL signals of individual quartz grains. This forms the basis for further investigations into the sensitivity of the equivalent dose (De) estimates to a range of different analytical approaches, including changes in the size of the test dose, the choice of signal integration interval, …
Natural Variations In The Properties Of Tl And Irsl Emissions From Metamorphic And Volcanic K-Feldspars From East Africa: Assessing Their Reliability For Dating, L Gliganic, Richard Roberts, Z Jacobs
Natural Variations In The Properties Of Tl And Irsl Emissions From Metamorphic And Volcanic K-Feldspars From East Africa: Assessing Their Reliability For Dating, L Gliganic, Richard Roberts, Z Jacobs
Richard G Roberts
The elevated temperature infrared stimulated luminescence (IRSL) and post-IR IRSL signals of potassium (K)-feldspars have recently garnered attention for their minimal rates of anomalous fading. The post-IR IRSL signal has been used to obtain age estimates for geological deposits, mostly in Europe. Studies on the behaviour of the IRSL and post-IR IRSL signals of K-feldspars from a wider range of geographic regions and depositional contexts are needed, particularly for regions where the OSL signal from quartz is poorly behaved. Discrepancies in the literature regarding the behaviours of the IRSL and TL signals of K-feldspars also highlight the need to characterise …