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Articles 1021 - 1050 of 3204
Full-Text Articles in Earth Sciences
The Source Detection Of 28 September 2018 Sulawesi Tsunami By Using Ionospheric Gnss Total Electron Content Disturbance, Jann-Yenq Liu, Chi-Yen Lin, Yuh-Ing Chen, Tso-Ren Wu, Meng-Ju Chung, Tien-Chi Liu, Yu-Lin Tsai, Loren C. Chang, Chi-Kuang Chao, Dimitar Ouzounov, Katsumi Hattori
The Source Detection Of 28 September 2018 Sulawesi Tsunami By Using Ionospheric Gnss Total Electron Content Disturbance, Jann-Yenq Liu, Chi-Yen Lin, Yuh-Ing Chen, Tso-Ren Wu, Meng-Ju Chung, Tien-Chi Liu, Yu-Lin Tsai, Loren C. Chang, Chi-Kuang Chao, Dimitar Ouzounov, Katsumi Hattori
Mathematics, Physics, and Computer Science Faculty Articles and Research
The 28 September 2018 magnitude Mw7.8 Palu, Indonesia earthquake (0.178° S, 119.840° E, depth 13 km) occurred at 10:02 UTC. The major earthquake triggered catastrophic liquefaction, landslides, and a near-field tsunami. The ionospheric total electron content (TEC) derived from records of 5 ground-based global navigation satellite system (GNSS) receivers is employed to detect tsunami traveling ionospheric disturbances (TTIDs). In total, 15 TTIDs have been detected. The ray-tracing and beamforming techniques are then used to find the TTID source location. The bootstrap method is applied in order to further explore the possible location of the tsunami source based on results of …
Production, Botanical Composition And Nutrient Status Of An Originally Lolium Perenne--Dominant Sward Receiving Long‐Term Manure Applications, Wenju Liu, Y. G. Zhu, P. Christie, A. Scott Laidlaw
Production, Botanical Composition And Nutrient Status Of An Originally Lolium Perenne--Dominant Sward Receiving Long‐Term Manure Applications, Wenju Liu, Y. G. Zhu, P. Christie, A. Scott Laidlaw
IGC Proceedings (1977-2023)
No abstract provided.
Nitrous Oxide Emission And Methane Oxidation Potential In The Pastoral Soil Under Intensive Dairy Farm Management, Z. Li, F. M. Kelliher
Nitrous Oxide Emission And Methane Oxidation Potential In The Pastoral Soil Under Intensive Dairy Farm Management, Z. Li, F. M. Kelliher
IGC Proceedings (1977-2023)
No abstract provided.
Effects Of Different Land Use On Soil Organic Carbon And Microbial Biomass C In The Longzhong Part Of Loess Plateau, Xiaodong Li, Shifang Pei, Xudong Li, Ding Guo, Xiaoyu Dong, Hua Fu
Effects Of Different Land Use On Soil Organic Carbon And Microbial Biomass C In The Longzhong Part Of Loess Plateau, Xiaodong Li, Shifang Pei, Xudong Li, Ding Guo, Xiaoyu Dong, Hua Fu
IGC Proceedings (1977-2023)
No abstract provided.
Effect Of Molybdenum And Boron On Increasing Alfalfa Seed Yield, Ke Li, Jinzhong Zhu
Effect Of Molybdenum And Boron On Increasing Alfalfa Seed Yield, Ke Li, Jinzhong Zhu
IGC Proceedings (1977-2023)
No abstract provided.
No3- Uptake And Its Partitioning In Drought Stressed Perennial Ryegrass (Lolium Perenne L.), B. R. Lee, Y. L. Jin, M. Li, W. J. Jung, T. H. Kim
No3- Uptake And Its Partitioning In Drought Stressed Perennial Ryegrass (Lolium Perenne L.), B. R. Lee, Y. L. Jin, M. Li, W. J. Jung, T. H. Kim
IGC Proceedings (1977-2023)
No abstract provided.
Comparison Of Aggregates Content And Carbon Proportion Of Top Soil In Perennial Forage, Lu Chen, Yuying Shen, Jing Yang, Yining Niu
Comparison Of Aggregates Content And Carbon Proportion Of Top Soil In Perennial Forage, Lu Chen, Yuying Shen, Jing Yang, Yining Niu
IGC Proceedings (1977-2023)
No abstract provided.
Effects Of Liming And Nitrogen Application On The Cu, Mn, And Zn Concentrations In Herbage From Extensively Managed Pastures, Harald Laser
Effects Of Liming And Nitrogen Application On The Cu, Mn, And Zn Concentrations In Herbage From Extensively Managed Pastures, Harald Laser
IGC Proceedings (1977-2023)
No abstract provided.
Response Of Natural And Cultivated Hay Meadows To Fertilizer Applied By Small Scale Livestock Farmers In The Mountainous Sandzak Region Of Serbia, Ian R. Lane, M. V. Stosic, G. Topisirovic, S. Reynolds
Response Of Natural And Cultivated Hay Meadows To Fertilizer Applied By Small Scale Livestock Farmers In The Mountainous Sandzak Region Of Serbia, Ian R. Lane, M. V. Stosic, G. Topisirovic, S. Reynolds
IGC Proceedings (1977-2023)
No abstract provided.
Characteristics Of The Chemical Composition And Carbohydrate/Protein Fractions Along With The Growth Of Alkali‐Grass (Puccinellia Tenuiflora) As Feed For Ruminants, M. Kato, N. Ishikawa, K. Shimizu, W. Cao, M. Amari, O. Enishi, X. Yu, A. Xu
Characteristics Of The Chemical Composition And Carbohydrate/Protein Fractions Along With The Growth Of Alkali‐Grass (Puccinellia Tenuiflora) As Feed For Ruminants, M. Kato, N. Ishikawa, K. Shimizu, W. Cao, M. Amari, O. Enishi, X. Yu, A. Xu
IGC Proceedings (1977-2023)
No abstract provided.
Using Climate To Explain And Predict West Nile Virus Risk In Nebraska, Kelly Helm Smith, Andrew J. Tyre, Jeff Hamik, Michael J. Hayes, Yuzhen Zhou, Li Dai
Using Climate To Explain And Predict West Nile Virus Risk In Nebraska, Kelly Helm Smith, Andrew J. Tyre, Jeff Hamik, Michael J. Hayes, Yuzhen Zhou, Li Dai
National Drought Mitigation Center: Faculty Publications
We used monthly precipitation and temperature data to give early warning of years with higher West Nile Virus (WNV) risk in Nebraska. We used generalized additive models with a negative binomial distribution and smoothing curves to identify combinations of extremes and timing that had the most influence, experimenting with all combinations of temperature and drought data, lagged by 12, 18, 24, 30, and 36 months. We fit models on data from 2002 through 2011, used Akaike's Information Criterion (AIC) to select the best‐fitting model, and used 2012 as out‐of‐sample data for prediction, and repeated this process for each successive year, …
Imidacloprid Movement Into Fungal Conidia Is Lethal To Mycophagous Beetles, Robin A. Choudhury, Andrew M. Sutherland, Matt J. Hengel, Michael P. Parrella, W. Douglass Gubler
Imidacloprid Movement Into Fungal Conidia Is Lethal To Mycophagous Beetles, Robin A. Choudhury, Andrew M. Sutherland, Matt J. Hengel, Michael P. Parrella, W. Douglass Gubler
School of Earth, Environmental, & Marine Sciences Faculty Publications
Applications of systemic pesticides can have unexpected direct and indirect effects on nontarget organisms, producing ecosystem-level impacts. We investigated whether a systemic insecticide (imidacloprid) could be absorbed by a plant pathogenic fungus infecting treated plants and whether the absorbed levels were high enough to have detrimental effects on the survival of a mycophagous beetle. Beetle larvae fed on these fungi were used to assess the survival effects of powdery mildew and imidacloprid in a factorial design. Fungal conidia were collected from treated and untreated plants and were tested for the presence and concentration of imidacloprid. The survival of beetles fed …
Collaborative Research: Constraining The Tempo And Dynamics Of Cambrian Earth Systems In Western Laurentia, Carol M. Dehler
Collaborative Research: Constraining The Tempo And Dynamics Of Cambrian Earth Systems In Western Laurentia, Carol M. Dehler
Funded Research Records
No abstract provided.
Nutrient Dynamics In A Semi‐Arid Grazing Land Of Southern India, K. Karunaichamy, Kailash Paliwal
Nutrient Dynamics In A Semi‐Arid Grazing Land Of Southern India, K. Karunaichamy, Kailash Paliwal
IGC Proceedings (1977-2023)
No abstract provided.
Effects Of Grazing On Am Colonization And Spore Density In Arid Grasslands Of Loess Plateau, Liang Jin, Chang Wang, Fujiang Hou, Shenghua Chang, Guiqi Zhang, Xiaojuan Wang
Effects Of Grazing On Am Colonization And Spore Density In Arid Grasslands Of Loess Plateau, Liang Jin, Chang Wang, Fujiang Hou, Shenghua Chang, Guiqi Zhang, Xiaojuan Wang
IGC Proceedings (1977-2023)
No abstract provided.
P And K Effects On N Partitioning During Regrowth Of Italian Ryegrass, Y. L. Jin, B. R. Lee, M. Li, W. J. Jung, T. H. Kim
P And K Effects On N Partitioning During Regrowth Of Italian Ryegrass, Y. L. Jin, B. R. Lee, M. Li, W. J. Jung, T. H. Kim
IGC Proceedings (1977-2023)
No abstract provided.
Impacts Of Long‐Term Enclosure On Soil Microbes In Mountain‐Pasture In Bayinbuluke, Ping'an Jiang
Impacts Of Long‐Term Enclosure On Soil Microbes In Mountain‐Pasture In Bayinbuluke, Ping'an Jiang
IGC Proceedings (1977-2023)
No abstract provided.
Effects Of Phosphate Fertilizer On Regrowth Of Medicago Sativa After Defoliation, Huixin Jiang, Yixin Shen, Guiyu Zhai
Effects Of Phosphate Fertilizer On Regrowth Of Medicago Sativa After Defoliation, Huixin Jiang, Yixin Shen, Guiyu Zhai
IGC Proceedings (1977-2023)
No abstract provided.
Caucasian Clover (Trifolium Ambiguum) Is Persistent In New Zealand Montane, Improved Rangeland But Requires Regular Sulphur Application For Productivity, P. Jarvis, R. J. Lucas, J. R. Sedcole
Caucasian Clover (Trifolium Ambiguum) Is Persistent In New Zealand Montane, Improved Rangeland But Requires Regular Sulphur Application For Productivity, P. Jarvis, R. J. Lucas, J. R. Sedcole
IGC Proceedings (1977-2023)
No abstract provided.
Effects Of Cultivation Of Puccinellia Tenuiflora On The Chemical And Physical Characteristics Of Alkalinized Soil In Western Areas Of Jilin, N. Ishikawa, M. Kato, K. Shimizu, M. Amari, W. Cao, X. Yu, A. Xu
Effects Of Cultivation Of Puccinellia Tenuiflora On The Chemical And Physical Characteristics Of Alkalinized Soil In Western Areas Of Jilin, N. Ishikawa, M. Kato, K. Shimizu, M. Amari, W. Cao, X. Yu, A. Xu
IGC Proceedings (1977-2023)
No abstract provided.
Yield Trends And Soil Mineral Changes In Three Summer Winter Forage Cropping Systems For 5 Consecutive Years In Southern Kyushu, Japan, Sachiko Idota, Yasuyuki Ishii
Yield Trends And Soil Mineral Changes In Three Summer Winter Forage Cropping Systems For 5 Consecutive Years In Southern Kyushu, Japan, Sachiko Idota, Yasuyuki Ishii
IGC Proceedings (1977-2023)
No abstract provided.
Correction Of Sulphur Deficiency On Naturalized Pastures Of Western Patagonia (Chile), Christian Hepp
Correction Of Sulphur Deficiency On Naturalized Pastures Of Western Patagonia (Chile), Christian Hepp
IGC Proceedings (1977-2023)
No abstract provided.
Root Development Of Three Commercial Forage Pigeon‐Pea Cultivars In Artificially Compacted Soil, Rodolfo Godoy, Osny Oliveira Santos Bacchi, Patrícia Menezes Santos, Fernando De Almeida Moreira
Root Development Of Three Commercial Forage Pigeon‐Pea Cultivars In Artificially Compacted Soil, Rodolfo Godoy, Osny Oliveira Santos Bacchi, Patrícia Menezes Santos, Fernando De Almeida Moreira
IGC Proceedings (1977-2023)
No abstract provided.
Selection Of Forage Pigeon‐Pea (Cajanus Cajan (L.) Millsp) Lines For Soil Decompaction, Rodolfo Godoy, Osny Oliveira Santos Bacchi, Patrícia Menezes Santos, Fernando De Almeida Moreira
Selection Of Forage Pigeon‐Pea (Cajanus Cajan (L.) Millsp) Lines For Soil Decompaction, Rodolfo Godoy, Osny Oliveira Santos Bacchi, Patrícia Menezes Santos, Fernando De Almeida Moreira
IGC Proceedings (1977-2023)
No abstract provided.
A Groundwater Model Of The San Luis Obispo Valley Basin Using Comsol Multiphysics, Brian Whetsler
A Groundwater Model Of The San Luis Obispo Valley Basin Using Comsol Multiphysics, Brian Whetsler
Master of Science in Environmental Sciences and Management Projects
A groundwater model of a subsection of the San Luis Obispo Valley basin was pro- duced using COMSOL Multiphysics 5.5 software. The goal of this project was to create a general model using forward modeling techniques which would serve as the foundation for a more refined, complete, and calibrated groundwater hydrology model. The San Luis Obispo and Edna Valley basins are characterized as high-priority by the California Sustainable Groundwater Management Act because of historic overdrafting of groundwater reserves during periods of drought in the early 1990's. Natural resource managers must use tools such as computer models to help forecast trends …
Meteoroid Impacts As A Source Of Bennu's Particle Ejection Events, W. F. Bottke, A. V. Moorhead, Harold Connolly Jr., C. W. Hergenrother, J. L. Molaro, P. Michel
Meteoroid Impacts As A Source Of Bennu's Particle Ejection Events, W. F. Bottke, A. V. Moorhead, Harold Connolly Jr., C. W. Hergenrother, J. L. Molaro, P. Michel
School of Earth & Environment Departmental Research
Asteroid (101955) Bennu, a near‐Earth object with a primitive carbonaceous chondrite‐like composition, was observed by the Origins, Spectral Interpretation, Resource Identification, and Security‐Regolith Explorer (OSIRIS‐REx) spacecraft to undergo multiple particle ejection events near perihelion between December 2018 and February 2019. The three largest events observed during this period, which all occurred 3.5 to 6 hr after local noon, placed numerous particles <10 cm on temporary orbits around Bennu. Here we examine whether these events could have been produced by sporadic meteoroid impacts using the National Aeronautics and Space Administration's (NASA) Meteoroid Engineering Model 3.0. Most projectiles that impact Bennu come from nearly isotropic or Jupiter‐family comets and have evolved toward the Sun by Poynting‐Robertson drag. We find that 7,000‐J impacts on Bennu occur with a biweekly cadence near perihelion, with a preference to strike in the late afternoon (~6 pm local time). This timing matches observations. Crater scaling laws also indicate that these impact energies can reproduce the sizes and masses of the largest observed particles, provided the surface has the cohesive properties of weak, porous materials. Bennu's ejection events could be caused by the same kinds of meteoroid impacts that created the Moon's asymmetric debris cloud observed by the Lunar Atmosphere and Dust Environment Explorer (LADEE). Our findings also suggest that fewer ejection events should take place as Bennu moves further away from the Sun, a result that can be tested with future observations.
Nano-Petrophysical Characterization Of The Oil Window Of Eagle Ford Shale From Southwestern To Central Texas, U.S.A., Chad Larsen
Nano-Petrophysical Characterization Of The Oil Window Of Eagle Ford Shale From Southwestern To Central Texas, U.S.A., Chad Larsen
Earth & Environmental Sciences Theses - Archive
Eagle Ford Shale and the overlying Austin Chalk are the main producing plays throughout Central Texas. Due to the high clastic nature of Eagle Ford Shale and its ability to produce and maintain fractures from hydraulic fracturing, this formation quickly became the favored target over Austin Chalk for unconventional hydrocarbon production. The purpose of this study is to gain an understanding of nano-petrophysical properties of Eagle Ford Shale, which is still lacking. Drilling cores from three wells within the oil window of Eagle Ford Shale were examined at the Bureau of Economic Geology in Austin, TX. Multiple plug samples were …
The Post-Wildfire Impact Of Burn Severity And Age On Black Carbon Snow Deposition And Implications For Snow Water Resources, Cascade Range, Washington, Ted M. Uecker, Susan D. Kaspari, Keith N. Musselman, S. Mckenzie Skiles
The Post-Wildfire Impact Of Burn Severity And Age On Black Carbon Snow Deposition And Implications For Snow Water Resources, Cascade Range, Washington, Ted M. Uecker, Susan D. Kaspari, Keith N. Musselman, S. Mckenzie Skiles
Geological Sciences Faculty Scholarship
Wildfires in the snow zone affect ablation by removing forest canopy, which enhances surface solar irradiance, and depositing light absorbing particles [LAPs, such as black carbon (BC)] on the snowpack, reducing snow albedo. How variations in BC deposition affects post-wildfire snowmelt timing is poorly known and highly relevant to water resources. We present a field-based analysis of BC variability across five sites of varying burn age and burn severity in the Cascade Range, Washington State, United States. Single particle soot photometer (SP2) analyses of BC snow concentrations were used to assess the impact of BC on snow albedo, and radiative …
Variability And Temporal Trends Of Semivolatile Organic Compounds In Biological And Environmental Media, Kyunghoon Kim
Variability And Temporal Trends Of Semivolatile Organic Compounds In Biological And Environmental Media, Kyunghoon Kim
Earth & Environmental Sciences Dissertations - Archive
Exposure to semivolatile organic compounds (SVOCs) in indoor environments and its potential impact on human health have been receiving increased public attention, because people in developed countries spend over 80% of their time indoors, SVOC levels are several orders of magnitude higher indoors than outdoors, and many SVOCs have various toxicities and endocrine disrupting potential. Concentrations of SVOCs in biological (e.g., human serum) and environmental (e.g., household dust, indoor air) media can help us better understand human exposure to SVOCs. For example, SVOC concentrations in biological media collected over several years may shed light on temporal trends of exposure due …
Investigation Of Pore-Scale Caco3 Distributions And Their Effects On Stiffness And Permeability Of Sands Treated By Microbially Induced Carbonate Precipitation (Micp), Hai Lin, Muhannad Suleiman, Derick G. Brown
Investigation Of Pore-Scale Caco3 Distributions And Their Effects On Stiffness And Permeability Of Sands Treated By Microbially Induced Carbonate Precipitation (Micp), Hai Lin, Muhannad Suleiman, Derick G. Brown
Faculty Publications
Physical properties of MICP-treated sands are controlled by CaCO3 distributions in pore space, which remain relatively unexplored. CaCO3 can deposit at the particles' contact area (contact-cementing), coat sand particles (grain-coating), or create a cementation bridge between soil grains (matrix-supporting). The objectives of this paper are to determine the dominant CaCO3 distributions in pore space and investigate the effects of CaCO3 distributions on the small-strain stiffness (measured by S-and P-wave velocities) and permeability of MICP-treated sands. To achieve these objectives, cemented-sand and uncemented-sand models combined with three ideal CaCO3 distributions (contact-cementing, grain-coating, and matrix-supporting) were used to estimate the S-and P-wave …