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Articles 15781 - 15810 of 16206
Full-Text Articles in Earth Sciences
Reassessing Hydrothermal Heat Discharge And The Relationship Of Hot Springs In The North Oregon Cascades, Aaron Alexander Orr
Reassessing Hydrothermal Heat Discharge And The Relationship Of Hot Springs In The North Oregon Cascades, Aaron Alexander Orr
Dissertations and Theses
Reservoir temperatures of hydrothermal systems in the Pacific Northwest reflect the feasibility of geothermal energy production and the tectonic framework of the region. Multicomponent geothermometry techniques were applied to new and historic water chemistry data in the north-central Oregon Western Cascades and the lower Wind River Valley in southern Washington in order to recalculate reservoir temperatures. Revised reservoir temperatures, water chemistry, and isotope data were used to determine relationships between hot springs in the north-central Oregon Cascades. Geothermal reservoir temperatures were estimated for the lower Wind River Valley (98.44 ± 0.96°C) and for Austin and Bagby Hot Springs (100.10 ± …
Mit-S1 Constitutive Model Calibration For A Portland-Area Soil, Steven Ryan Young
Mit-S1 Constitutive Model Calibration For A Portland-Area Soil, Steven Ryan Young
Dissertations and Theses
Soils that are intermediate to sands and clays are a challenge for geotechnical engineers since most methods for interpreting soil properties or soil behaviors are based on sands or clays and do not address behaviors of intermediate soils. This is a particular challenge for engineers in the Portland-area where many of the major soil units are composed of intermediate soils. Analysis of intermediate soils is further challenged since many standard constitutive models are based on sandy or clay-like soils. However, the MIT-S1 constitutive model is capable of capturing intermediate soil behavior. A calibration of the MIT-S1 constitutive model for Portland-area …
Evaluation Of Undeveloped Hard Coal Deposits And Estimation Of Hard Coal Reserves In The Upper Silesian Coal Basin, Poland, Tomasz Urych, Jarosław Chećko, Marek Rosa, Anna Wątor
Evaluation Of Undeveloped Hard Coal Deposits And Estimation Of Hard Coal Reserves In The Upper Silesian Coal Basin, Poland, Tomasz Urych, Jarosław Chećko, Marek Rosa, Anna Wątor
Journal of Sustainable Mining
The article presents the results of works concerning evaluation of undeveloped deposits in the Upper Silesian Coal Basin and an estimation of hard coal reserves which can be developed by 2050. Evaluation of hard coal deposits was established on criterions choice and their score determination. On the basis of obtained the final score and after consultations with experts in the field of hard coal mining, there were selected three areas of undeveloped deposits with the amount of about 1.99 Gt (billion metric tons) of anticipated economic resources which can extend the coal reserve base located in the direct vicinity of …
Trimethylornithine Membrane Lipids: Discovered In Planctomycetes And Identified In Diverse Environments, Eli K. Moore
Trimethylornithine Membrane Lipids: Discovered In Planctomycetes And Identified In Diverse Environments, Eli K. Moore
School of Earth & Environment Departmental Research
Intact polar membrane lipids (IPLs) are the building blocks of all cell membranes. There is a wide range of phosphorus-free IPL structures, including amino acid containing IPLs, that can be taxonomically specific. Trimethylornithine membrane lipids (TMOs) were discovered in northern wetland Planctomycete species that were isolated and described in the last decade. The trimethylated terminal nitrogen moiety of the ornithine amino acid in the TMO structure gives the lipid a charged polar head group, similar to certain phospholipids. Since their discovery, TMOs have been identified in various other recently described northern latitude Planctomycete species, and in diverse environments including tundra …
Seismicity And Pn Velocity Structure Of Central West Antarctica, Erica M. Lucas, Andrew A. Nyblade, Andrew J. Lloyd, Richard C. Aster, Douglas A. Wiens, John Paul O'Donnell, Graham W. Stuart, Terry J. Wilson, Ian W. D. Dalziel, J. Paul Winberry, Audrey D. Huerta
Seismicity And Pn Velocity Structure Of Central West Antarctica, Erica M. Lucas, Andrew A. Nyblade, Andrew J. Lloyd, Richard C. Aster, Douglas A. Wiens, John Paul O'Donnell, Graham W. Stuart, Terry J. Wilson, Ian W. D. Dalziel, J. Paul Winberry, Audrey D. Huerta
Geological Sciences Faculty Scholarship
We have located 117 previously undetected seismic events mainly occurring between 2015 and 2017 that originated from glacial, tectonic, and volcanic processes in central West Antarctica using data recorded on Polar Earth Observing Network (POLENET/ANET) and UK Antarctic Network (UKANET) seismic stations. The seismic events, with local magnitudes (ML) ranging from 1.1 to 3.5, are predominantly clustered in four geographic regions; the Ellsworth Mountains, Thwaites Glacier, Pine Island Glacier, and Mount Takahe. Eighteen of the events are in the Ellsworth Mountains and can be attributed to a mixture of glacial and tectonic processes. The largest event noted …
A Record Of Vapour Pressure Deficit Preserved In Wood And Soil Across Biomes, Adrian Broz, Gregory J. Retallack, Toby M. Maxwell, Lucas C.R. Silva
A Record Of Vapour Pressure Deficit Preserved In Wood And Soil Across Biomes, Adrian Broz, Gregory J. Retallack, Toby M. Maxwell, Lucas C.R. Silva
Biology Faculty Publications and Presentations
The drying power of air, or vapour pressure deficit (VPD), is an important measurement of potential plant stress and productivity. Estimates of VPD values of the past are integral for understanding the link between rising modern atmospheric carbon dioxide (pCO2) and global water balance. A geological record of VPD is needed for paleoclimate studies of past greenhouse spikes which attempt to constrain future climate, but at present there are few quantitative atmospheric moisture proxies that can be applied to fossil material. Here we show that VPD leaves a permanent record in the slope (S) of least-squares …
Nickel Isotopic Evidence For Late-Stage Accretion Of Mercury-Like Differentiated Planetary Embryos, Shui Jiong Wang, Wenzhong Wang, Jian Ming Zhu, Zhongqing Wu, Jingao Liu, Guilin Han, Fang Zhen Teng, Shichun Huang, Hongjie Wu, Yujian Wang, Guangliang Wu, Weihan Li
Nickel Isotopic Evidence For Late-Stage Accretion Of Mercury-Like Differentiated Planetary Embryos, Shui Jiong Wang, Wenzhong Wang, Jian Ming Zhu, Zhongqing Wu, Jingao Liu, Guilin Han, Fang Zhen Teng, Shichun Huang, Hongjie Wu, Yujian Wang, Guangliang Wu, Weihan Li
Geoscience Faculty Research
© 2021, The Author(s). Earth’s habitability is closely tied to its late-stage accretion, during which impactors delivered the majority of life-essential volatiles. However, the nature of these final building blocks remains poorly constrained. Nickel (Ni) can be a useful tracer in characterizing this accretion as most Ni in the bulk silicate Earth (BSE) comes from the late-stage impactors. Here, we apply Ni stable isotope analysis to a large number of meteorites and terrestrial rocks, and find that the BSE has a lighter Ni isotopic composition compared to chondrites. Using first-principles calculations based on density functional theory, we show that core-mantle …
The Use Of Once Daily Milking Of Dairy Cows To Achieve Economic And Social Sustainability On New Zealand Dairy Farms, David A. Clark, Dawn E. Dalley
The Use Of Once Daily Milking Of Dairy Cows To Achieve Economic And Social Sustainability On New Zealand Dairy Farms, David A. Clark, Dawn E. Dalley
IGC Proceedings (1977-2023)
No abstract provided.
Rangeland Responses To Cattle Grazing Systems In Northern Australia, Trevor J. Hall, John G. Mcivor
Rangeland Responses To Cattle Grazing Systems In Northern Australia, Trevor J. Hall, John G. Mcivor
IGC Proceedings (1977-2023)
No abstract provided.
Effect Of Plant Patches On The Foraging Location Of Beef Cattle, Y. C. Zhou, Deli Wang, A. K. Xu, Z. F. Wang, H. Z. Yu
Effect Of Plant Patches On The Foraging Location Of Beef Cattle, Y. C. Zhou, Deli Wang, A. K. Xu, Z. F. Wang, H. Z. Yu
IGC Proceedings (1977-2023)
No abstract provided.
Lamb Fattening On Mediterranean‐Like Pastures In Chile Versus Olive Oil Cake‐Based Rations, C. Aguilar, R. Vera, R. Lira, J. Quenaya, Fernando Squella, H. Yutronic, P. Toro, P. Perez, I. Briones
Lamb Fattening On Mediterranean‐Like Pastures In Chile Versus Olive Oil Cake‐Based Rations, C. Aguilar, R. Vera, R. Lira, J. Quenaya, Fernando Squella, H. Yutronic, P. Toro, P. Perez, I. Briones
IGC Proceedings (1977-2023)
No abstract provided.
Integration Of Small Holder Crop‐Forage‐Livestock Systems In South East Asia--An Eastern Indonesian Case Study, Neil D. Macleod, Shaun Lisson, Cam Mcdonald, Jeff P. Corfield, Rachmat Rahman, Ketut Puspadi
Integration Of Small Holder Crop‐Forage‐Livestock Systems In South East Asia--An Eastern Indonesian Case Study, Neil D. Macleod, Shaun Lisson, Cam Mcdonald, Jeff P. Corfield, Rachmat Rahman, Ketut Puspadi
IGC Proceedings (1977-2023)
No abstract provided.
Relationship Between Individual Chamber And Whole Shell Mg/Ca Ratios In Trilobatus Sacculifer And Implications For Individual Foraminifera Palaeoceanographic Reconstructions, Gerald T. Rustic, Pratigya J. Polissar, Ana Christina Ravelo, Peter Demenocal
Relationship Between Individual Chamber And Whole Shell Mg/Ca Ratios In Trilobatus Sacculifer And Implications For Individual Foraminifera Palaeoceanographic Reconstructions, Gerald T. Rustic, Pratigya J. Polissar, Ana Christina Ravelo, Peter Demenocal
School of Earth & Environment Departmental Research
Precisely targeted measurements of trace elements using laser ablation inductively coupled plasma mass spectrometry (LA-ICPMS) reveal inter-chamber heterogeneities in specimens of the planktic foraminifer Trilobatus (Globigerinoides) sacculifer. We find that Mg/Ca ratios in the final growth chamber are generally lower compared to previous growth chambers, but final chamber Mg/Ca is elevated in one of thirteen sample intervals. Differences in distributions of Mg/Ca values from separate growth chambers are observed, occurring most often at lower Mg/Ca values, suggesting that single-chamber measurements may not be reflective of the specimen’s integrated Mg/Ca. We compared LA-ICPMS Mg/Ca values to paired, same-individual Mg/Ca measured via …
The History Of The International Grassland Congress 1927-2020, S. Ray Smith, Vivien G. Allen, Roger Wilkins, Garry D. Lacefield
The History Of The International Grassland Congress 1927-2020, S. Ray Smith, Vivien G. Allen, Roger Wilkins, Garry D. Lacefield
Plant and Soil Sciences Presentations
Grasslands cover 27% of the world’s land area and 70% of agricultural land. They form an important foundation for agriculture and livestock husbandry and contribute to the livelihoods of more than 800 million people. The International Grassland Congress (IGC) began as a meeting of a small group of forage researchers in Europe in 1927. It has now expanded into a gathering held every 3-5 years with over 1000 delegates from 80+ countries who represent research, extension, and primary production. The newly released IGC history provides not only an overview of the IGC Congress over the last 93 years, but highlights …
Concentrated Lunar Resources: Imminent Implications For Governance And Justice, Martin Elvis, Alanna Krolikowski, Tony Milligan
Concentrated Lunar Resources: Imminent Implications For Governance And Justice, Martin Elvis, Alanna Krolikowski, Tony Milligan
History and Political Science Faculty Research & Creative Works
Numerous missions planned for the next decade are likely to target a handful of small sites of interest on the Moon's surface, creating risks of crowding and interference at these locations. The Moon presents finite and scarce areas with rare topography or concentrations of resources of special value. Locations of interest to science, notably for astronomy, include the Peaks of Eternal Light, the coldest of the cold traps and smooth areas on the far side. Regions richest in physical resources could also be uniquely suited to settlement and commerce. Such sites of interest are both few and small. Typically, there …
A Study On Ningxia Desert Grassland (Stipa Breviflora) Utilization, Kechang Li, Xin Wu, Jinhua Wang, Zhao Yu
A Study On Ningxia Desert Grassland (Stipa Breviflora) Utilization, Kechang Li, Xin Wu, Jinhua Wang, Zhao Yu
IGC Proceedings (1977-2023)
No abstract provided.
West African Dwarf Goat Milk Production And Composition Under Semi Intensive Management In Cameroon During The Dry Season, B. Boukila, E. Tedonkeng Pamo, F. A. Fonteh, F. Tendonkeng
West African Dwarf Goat Milk Production And Composition Under Semi Intensive Management In Cameroon During The Dry Season, B. Boukila, E. Tedonkeng Pamo, F. A. Fonteh, F. Tendonkeng
IGC Proceedings (1977-2023)
No abstract provided.
Determination Of Animal Unit Weight In Rangelands Of Iran, Hossein Arzani, Mehdi Ghorbani, A. Nikkhah, Hossein Azarnivand
Determination Of Animal Unit Weight In Rangelands Of Iran, Hossein Arzani, Mehdi Ghorbani, A. Nikkhah, Hossein Azarnivand
IGC Proceedings (1977-2023)
No abstract provided.
Effect Of Soil Type And Management On Botanical Composition Of The Sward, S. Alibegovic‐Grbic, M. Bezdrob, H. Custovic
Effect Of Soil Type And Management On Botanical Composition Of The Sward, S. Alibegovic‐Grbic, M. Bezdrob, H. Custovic
IGC Proceedings (1977-2023)
No abstract provided.
Seasonal Changes In Nutrient Intake Of Grazing Beef Cows On An Alpine Pasture In Japan, Masato Yayota, M. Nakano, R. Tamai, Shigeru Ohtani
Seasonal Changes In Nutrient Intake Of Grazing Beef Cows On An Alpine Pasture In Japan, Masato Yayota, M. Nakano, R. Tamai, Shigeru Ohtani
IGC Proceedings (1977-2023)
No abstract provided.
Effects Of Concentrate Supplement On Intake And Weight Gain Of Grazing Lambs, Xiaoqing Zhang, Yanmei Jin, Risu Na, Qizhong Sun
Effects Of Concentrate Supplement On Intake And Weight Gain Of Grazing Lambs, Xiaoqing Zhang, Yanmei Jin, Risu Na, Qizhong Sun
IGC Proceedings (1977-2023)
No abstract provided.
Simultaneous Determination Of Purine Derivatives And Creatinine In Ruminant Urine By Hplc, F. L. Yang, Ruijun Long, H. C. Wang, X. P. Li
Simultaneous Determination Of Purine Derivatives And Creatinine In Ruminant Urine By Hplc, F. L. Yang, Ruijun Long, H. C. Wang, X. P. Li
IGC Proceedings (1977-2023)
No abstract provided.
Suitable Grazing Methods For The Stipa Bungeana Grassland In Southern Ningxia Foothills, Jinhua Wang, Binyu Zhang, Chengjiang Dai, Shouding Shi
Suitable Grazing Methods For The Stipa Bungeana Grassland In Southern Ningxia Foothills, Jinhua Wang, Binyu Zhang, Chengjiang Dai, Shouding Shi
IGC Proceedings (1977-2023)
No abstract provided.
The Role Of Functional Plant In Sheep Foraging, Ling Wang, Guowei Chen, Xiao Shun, Deli Wang
The Role Of Functional Plant In Sheep Foraging, Ling Wang, Guowei Chen, Xiao Shun, Deli Wang
IGC Proceedings (1977-2023)
No abstract provided.
Wine Terroir And The Soil Bacteria: An Amplicon Sequencing-Based Assessment Of The Barossa Valley And Its Sub-Regions, Jia Zhou, Timothy R. Cavagnaro, Roberta De Bei, Tiffanie M. Nelson, John R. Stephen, Andrew Metcalfe, Matthew Gilliham, James Breen, Cassandra Collins, Carlos M. Rodríguez López
Wine Terroir And The Soil Bacteria: An Amplicon Sequencing-Based Assessment Of The Barossa Valley And Its Sub-Regions, Jia Zhou, Timothy R. Cavagnaro, Roberta De Bei, Tiffanie M. Nelson, John R. Stephen, Andrew Metcalfe, Matthew Gilliham, James Breen, Cassandra Collins, Carlos M. Rodríguez López
Horticulture Faculty Publications
A wines’ terroir, represented as wine traits with regional distinctiveness, is a reflection of both the biophysical and human-driven conditions in which the grapes were grown and wine made. Soil is an important factor contributing to the uniqueness of a wine produced by vines grown in specific conditions. Here, we evaluated the impact of environmental variables on the soil bacteria of 22 Barossa Valley vineyard sites based on the 16S rRNA gene hypervariable region 4. In this study, we report that both dispersal isolation by geographic distance and environmental heterogeneity (soil plant-available P content, elevation, rainfall, temperature, spacing between row …
Influence Of Composition Ratio Of Herbage And Shrub On Roadside Vegetation Characteristics Along Bi‐Tong Highway, Xiangfeng Zhang, Chuang Ma, Shikui Dong, Wenhui Zhang, Xincheng Liu
Influence Of Composition Ratio Of Herbage And Shrub On Roadside Vegetation Characteristics Along Bi‐Tong Highway, Xiangfeng Zhang, Chuang Ma, Shikui Dong, Wenhui Zhang, Xincheng Liu
IGC Proceedings (1977-2023)
No abstract provided.
Quantitative Analysis On Different Degeneration Stage Of Meadow Steppe In Hulunbeier, Inner Mongolia, Mingjun Wang, Guodong Han
Quantitative Analysis On Different Degeneration Stage Of Meadow Steppe In Hulunbeier, Inner Mongolia, Mingjun Wang, Guodong Han
IGC Proceedings (1977-2023)
No abstract provided.
Indicators And Characteristics Of Degenerated Grassland In China, Fengxia Li, Ting Gao, Jianning Zhu
Indicators And Characteristics Of Degenerated Grassland In China, Fengxia Li, Ting Gao, Jianning Zhu
IGC Proceedings (1977-2023)
No abstract provided.
Population Dynamics Of Soil Microorganisms In Deteriorate Grassland In West Region Of China, Tuo Yao, D. G. Zhang, R. J. Long, L. Q. Xi
Population Dynamics Of Soil Microorganisms In Deteriorate Grassland In West Region Of China, Tuo Yao, D. G. Zhang, R. J. Long, L. Q. Xi
IGC Proceedings (1977-2023)
No abstract provided.
Research On Classification Criteria Of Heitutan (Black Soil Beach) Degraded Grassland In Sanjiangyuan Region, Xilai Li, Haiqun Sun, Changhui Li, Guangxin Lu, Youjun Lian, Jilan Li, Ying Zhang
Research On Classification Criteria Of Heitutan (Black Soil Beach) Degraded Grassland In Sanjiangyuan Region, Xilai Li, Haiqun Sun, Changhui Li, Guangxin Lu, Youjun Lian, Jilan Li, Ying Zhang
IGC Proceedings (1977-2023)
No abstract provided.