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2021

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Articles 15361 - 15390 of 16207

Full-Text Articles in Earth Sciences

Spatial Variations Of Upper Crustal Anisotropy Along The San Jacinto Fault Zone In Southern California: Constraints From Shear Wave Splitting Analysis, Enyuan Jiang, Kelly H. Liu, Yuan Gao, Xiaofei Fu, Stephen S. Gao Apr 2021

Spatial Variations Of Upper Crustal Anisotropy Along The San Jacinto Fault Zone In Southern California: Constraints From Shear Wave Splitting Analysis, Enyuan Jiang, Kelly H. Liu, Yuan Gao, Xiaofei Fu, Stephen S. Gao

Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works

To discern spatial and explore possible existence of temporal variations of upper crustal anisotropy in an ∼15 km section of the San Jacinto Fault Zone (SJFZ) that is composed of the Buck Ridge and Clark faults in southern California, we conduct a systematic shear wave splitting investigation using local S-wave data recorded by three broadband seismic stations located near the surface expression of the SJFZ. An automatic data selection and splitting measurement procedure is first applied, and the resulting splitting measurements are then manually screened to ensure reliability of the results. Strong spatial variations in crustal anisotropy are revealed by …


Radiogenic Pb Enrichment Of Mississippi Valley-Type Metallic Ore Deposits, Southern Ozarks: Constraints Based On Geochemical Studies Of Source Rocks And Their Diagenetic History, Jonathan Chick, Sydney E. Mckim, Adriana Potra, Walter L. Manger, John R. Samuelsen Apr 2021

Radiogenic Pb Enrichment Of Mississippi Valley-Type Metallic Ore Deposits, Southern Ozarks: Constraints Based On Geochemical Studies Of Source Rocks And Their Diagenetic History, Jonathan Chick, Sydney E. Mckim, Adriana Potra, Walter L. Manger, John R. Samuelsen

Geosciences Faculty Publications and Presentations

Southern Ozark Mississippi Valley-type ores are enriched in radiogenic Pb, with isotopic signatures suggesting that metals were supplied by two end-member components. While the less radiogenic component appears to be derived from various shale and sandstone units, the source of the more radiogenic component has not yet been identified. Analyses of cherts from the Early Ordovician Cotter Dolomite and tripolitic chert from the Early Mississippian Boone Formation contain highly radiogenic Pb, with isotopic ratios comparable to those of ores. However, most samples have lower 208Pb/204Pb and 207Pb/204Pb for a given 206Pb/204Pb …


Investigation Of Hurricane Irma Deposits, Big Pine Key, Florida, Youzhu Wang Apr 2021

Investigation Of Hurricane Irma Deposits, Big Pine Key, Florida, Youzhu Wang

USF Tampa Graduate Theses and Dissertations

Few paleotempestological studies have focused on coastal sinkholes, a common feature in Florida, which can receive and preserve storm overwash sediments. The major goal of this research is to improve our understanding of the characteristic signatures of storm sediments in sinkholes thereby determining reliability of these environments as proxies for hurricanes. Hurricane Irma as a Category 5 storm provides an excellent case study for characterizing storm deposits in sinkholes on Big Pine Key. I cored at four sinkholes along a 350 m transect normal to the shoreline. Core sediments were characterized using physical description, short-lived radioisotope dating, sediment grain size …


Geo-Spatial Modeling Of Carbon Sequestration Assessment In Date Palm, Abu Dhabi: An Integrated Approach Of Fieldwork, Remote Sensing, And Gis, Basam Saeed Dahy Apr 2021

Geo-Spatial Modeling Of Carbon Sequestration Assessment In Date Palm, Abu Dhabi: An Integrated Approach Of Fieldwork, Remote Sensing, And Gis, Basam Saeed Dahy

Dissertations

The United Arab Emirates (UAE) has undertaken huge efforts to green the desert and afforestation projects (planted mainly with date palms) hence, reducing its carbon footprint, which have never been accounted for, because of lack of implemented mechanisms and tools to assess the amount of biomass and carbon stock (CS) sequestered by plants in the country. The purpose of this dissertation is to implement a new approach towards assessing the carbon sequestered by date palm (DP) plantations in Abu Dhabi, in both their biomass compartment as well as the soils under beneath, using geospatial technologies (RS and GIS) assessed by …


Intercropping Desmodium And Maize Improves Nitrogen And Phosphorus Availability And Performance Of Maize In Kenya, Pierre Celestin Ndayisaba, Shem Kuyah, Charles Aura Odhiambo Midega, Peter Njoroge Mwangi, Zeyaur Rahman Khan Apr 2021

Intercropping Desmodium And Maize Improves Nitrogen And Phosphorus Availability And Performance Of Maize In Kenya, Pierre Celestin Ndayisaba, Shem Kuyah, Charles Aura Odhiambo Midega, Peter Njoroge Mwangi, Zeyaur Rahman Khan

All Peer-Reviewed Publications

Low levels of nitrogen (N) and phosphorus (P) in soils in sub-Saharan Africa (SSA) limit maize (Zea mays) production in smallholder farms. We tested the hypothesis that desmodium (Desmodium intortum (Mill.) Urb.), a fodder legume, and food legumes commonly grown with maize in Western Kenya avail N and P and improve the performance of maize in intercrops. We measured available N and P in 15 cm topsoil at 4, 8 and 12 weeks after planting (WAP), and corresponding maize shoot weight in three seasons: 2017 long rains (LR), 2017 short rains (SR), and 2018 LR at Thomas Odhiambo Campus of …


Reconstructing Surface Water Carbonate Ion Concentration Changes In The Eastern Equatorial Pacific Across Glacial Transitions, Lenzie Gail Ward Apr 2021

Reconstructing Surface Water Carbonate Ion Concentration Changes In The Eastern Equatorial Pacific Across Glacial Transitions, Lenzie Gail Ward

OES Theses and Dissertations

Today, the eastern equatorial Pacific (EEP) plays a critical role in the global CO2 budget as a major source of CO2 to the atmosphere, but recent studies suggest the region may shift to a sink for atmospheric CO2 under different climate states. Here, I focus on two transitional periods, the last deglaciation (25 kyr to present) and last glaciation (the Marine Isotope Stage (MIS) 5a-4 transition, 96 to 60 kyr), to investigate how the carbon system in the EEP responds to major climate changes. I measured B/Ca ratios in the planktic foraminifera Globigerina bulloides from core MV1014-17JC …


Native Plant Development And Restoration Program For The Great Basin, Usa, N. L. Shaw, Michael Pellant, P. Olwell, S. L. Jensen, E. D. Mcarthur Mar 2021

Native Plant Development And Restoration Program For The Great Basin, Usa, N. L. Shaw, Michael Pellant, P. Olwell, S. L. Jensen, E. D. Mcarthur

IGC Proceedings (1977-2023)

No abstract provided.


Sericea Lespedeza‐-A Natural Dewormer For Sheep And Goats, Thomas H. Terrill Mar 2021

Sericea Lespedeza‐-A Natural Dewormer For Sheep And Goats, Thomas H. Terrill

IGC Proceedings (1977-2023)

No abstract provided.


Germination And Early Growth Of Slickspot Peppergrass (Lepidium Papilliferum) As Affected By Desert Soil Humic Acids, E. Loffredo, A. J. Palazzo, N. Senesi, C. E. Clapp Mar 2021

Germination And Early Growth Of Slickspot Peppergrass (Lepidium Papilliferum) As Affected By Desert Soil Humic Acids, E. Loffredo, A. J. Palazzo, N. Senesi, C. E. Clapp

IGC Proceedings (1977-2023)

No abstract provided.


Effect Of Chromium Metal Accumulation On The Magnesium Absorption And Chlorophyll Content In Vegetables, Widya Sartika Sulistiani, Hening Widowati, Kartika Sari, Agus Sutanto Mar 2021

Effect Of Chromium Metal Accumulation On The Magnesium Absorption And Chlorophyll Content In Vegetables, Widya Sartika Sulistiani, Hening Widowati, Kartika Sari, Agus Sutanto

Makara Journal of Science

This study analyzed the effect of chromium metal accumulation on magnesium absorption and chlorophyll content in vegetables. The effect of accumulation was determined by performing controlled experimental methods on planting media supplemented with chromium and by directly observing vegetables grown in chromium-polluted areas, such as mountain, rice field, street, and industrial areas. The controlled experiments were carried out by varying the chromium contamination (1 and 3 ppm) and magnesium nutrition (0.4, 0.6, and 0.8 g/L) in planting media. The controlled experiment was compared with the results of field observation in several chromium-polluted areas. The effect of the treatment was analyzed …


Response Of Activated Oxygen Metabolism To Water Stress In Different Drought‐Tolerant Alfalfa (Medicago Sativa) At Seedling Stage, Ruihong Han, Hua Tian, Xinshi Lu Mar 2021

Response Of Activated Oxygen Metabolism To Water Stress In Different Drought‐Tolerant Alfalfa (Medicago Sativa) At Seedling Stage, Ruihong Han, Hua Tian, Xinshi Lu

IGC Proceedings (1977-2023)

No abstract provided.


Evaluation Of Heat Tolerance Of Alfalfa Varieties (Medicago Sativa) At Seedling Stage, Ruihong Han, Guijuan Gao, Zhenfei Guo Mar 2021

Evaluation Of Heat Tolerance Of Alfalfa Varieties (Medicago Sativa) At Seedling Stage, Ruihong Han, Guijuan Gao, Zhenfei Guo

IGC Proceedings (1977-2023)

No abstract provided.


Adventuring Into Complexity By Exploring Data: From Complicity To Sustainability, Tim Lutz Mar 2021

Adventuring Into Complexity By Exploring Data: From Complicity To Sustainability, Tim Lutz

Northeast Journal of Complex Systems (NEJCS)

Problems of sustainability are typically represented by major present-day challenges such as climate change, biodiversity loss, and environmental and social injustice. Framed this way, sustainable lives and societies depend on finding solutions to each problem. From another perspective, there is only one problem behind them all, stated by Gregory Bateson as: “…the difference between how nature works and the way people think,” and complexity provides a way to define and approach this problem. I extend Edgar Morin’s conceptions of restricted and general complexity into pedagogy to address problems of simplicity and reductionist teaching. The proposed pedagogy is based on long …


Serial Interaction Of Primitive Magmas With Felsic And Mafic Crust Recorded By Gabbroic Dikes From The Antarctic Extension Of The Karoo Large Igneous Province, Jussi S. Heinonen, Arto V. Luttinen, Frank J. Spera, Saku K. Vuori, Wendy A. Bohrson Mar 2021

Serial Interaction Of Primitive Magmas With Felsic And Mafic Crust Recorded By Gabbroic Dikes From The Antarctic Extension Of The Karoo Large Igneous Province, Jussi S. Heinonen, Arto V. Luttinen, Frank J. Spera, Saku K. Vuori, Wendy A. Bohrson

Geological Sciences Faculty Scholarship

Two subvertical gabbroic dikes with widths of ~ 350 m (East-Muren) and ≥ 500 m (West-Muren) crosscut continental flood basalts in the Antarctic extension of the ~ 180 Ma Karoo large igneous province (LIP) in Vestfjella, western Dronning Maud Land. The dikes exhibit unusual geochemical profiles; most significantly, initial (at 180 Ma) εNd values increase from the dike interiors towards the hornfelsed wallrock basalts (from − 15.3 to − 7.8 in East-Muren and more gradually from − 9.0 to − 5.5 in West-Muren). In this study, we utilize models of partial melting and energy-constrained assimilation‒fractional crystallization in deciphering the …


Collaborative Research: Identifying Shallow Slow Slip Using Hematite Tectures And (U-Th)/He Thermochonometry Of Exhumed And Experimental Faults, Alexis Ault Mar 2021

Collaborative Research: Identifying Shallow Slow Slip Using Hematite Tectures And (U-Th)/He Thermochonometry Of Exhumed And Experimental Faults, Alexis Ault

Funded Research Records

No abstract provided.


Cluster Analysis Of Lithology Grouping Trends Using Principal Component Spectral Analysis And Complex Seismic Attributes, Isfan Isfan, Agustinus Harsono, Abdul Haris Mar 2021

Cluster Analysis Of Lithology Grouping Trends Using Principal Component Spectral Analysis And Complex Seismic Attributes, Isfan Isfan, Agustinus Harsono, Abdul Haris

Makara Journal of Science

Cluster analysis is used to determine possible lithology groupings on the basis of information from seismic data. Specifically, k-means is used in the cluster analysis of different lithologies. The data center is determined randomly and updated through an iterative process (unsupervised). The cluster analysis process involves combinations of complex seismic attributes and spectral decomposition as inputs. The complex seismic attributes are reflection strength and cosine phase. Reflection strength clearly describes the lithology boundary while the cosine phase describes the lithologies. Spectral decomposition is used to detect the presence of channels. The resolution of seismic data generally reaches 90 Hz. Spectral …


Ancient Plant Dna Reveals High Arctic Greening During The Last Interglacial, Sarah E. Crump, Bianca Fréchette, Matthew Power, Sam Cutler, Gregory De Wet, Martha K. Raynolds, Jonathan H. Raberg, Jason P. Briner, Elizabeth K. Thomas, Julio Sepúlveda, Beth Shapiro, Michael Bunce, Gifford H. Miller Mar 2021

Ancient Plant Dna Reveals High Arctic Greening During The Last Interglacial, Sarah E. Crump, Bianca Fréchette, Matthew Power, Sam Cutler, Gregory De Wet, Martha K. Raynolds, Jonathan H. Raberg, Jason P. Briner, Elizabeth K. Thomas, Julio Sepúlveda, Beth Shapiro, Michael Bunce, Gifford H. Miller

Geosciences: Faculty Publications

Summer warming is driving a greening trend across the Arctic, with the potential for large-scale amplification of climate change due to vegetation-related feedbacks [Pearson et al., Nat. Clim. Chang. (3), 673–677 (2013)]. Because observational records are sparse and temporally limited, past episodes of Arctic warming can help elucidate the magnitude of vegetation response to temperature change. The Last Interglacial ([LIG], 129,000 to 116,000 y ago) was the most recent episode of Arctic warming on par with predicted 21st century temperature change [Otto-Bliesner et al., Philos. Trans. A Math. Phys. Eng. Sci. (371), 20130097 (2013) and Post et al., Sci. Adv. …


Investigating Decadal Changes Of Multiple Hydrological Products And Land-Cover Changes In The Mediterranean Region For 2009–2018, Wenzhao Li, Sachi Perera, Erik Linstead, Rejoice Thomas, Hesham El-Askary, Thomas Piechota, Daniele Struppa Mar 2021

Investigating Decadal Changes Of Multiple Hydrological Products And Land-Cover Changes In The Mediterranean Region For 2009–2018, Wenzhao Li, Sachi Perera, Erik Linstead, Rejoice Thomas, Hesham El-Askary, Thomas Piechota, Daniele Struppa

Mathematics, Physics, and Computer Science Faculty Articles and Research

Land-cover change is a critical concern due to its climatic, ecological, and socioeconomic consequences. In this study, we used multiple variables including precipitation, vegetation index, surface soil moisture, and evapotranspiration obtained from different satellite sources to study their association with land-cover changes in the Mediterranean region. Both observational and modeling data were used for climatology and correlation analysis. Famine Early Warning Systems Network (FEWS NET) Land Data Assimilation System (FLDAS) and Global Land Data Assimilation System (GLDAS) were used to extract surface soil moisture and evapotranspiration data. Intercomparing the results of FLDAS and GLDAS suggested that FLDAS data had better …


The Effect Of Temperature On Seed Dormancy In An Alpine Meadow On The Eastern Tsinghai‐Tibet Plateau, Wenlong Li, Jing Xu, Guozhen Du, Zizhen Li Mar 2021

The Effect Of Temperature On Seed Dormancy In An Alpine Meadow On The Eastern Tsinghai‐Tibet Plateau, Wenlong Li, Jing Xu, Guozhen Du, Zizhen Li

IGC Proceedings (1977-2023)

No abstract provided.


Effects Of Ingestion By Cattle On Germinability Of Seeds Of Three Different Browse Plants, Alaba O. Jolaosho, B. O. Oduguwa, O. M. Arigbede, A. O. Olanite, Olufemi S. Onifade, Y. U. Anele, G. A. Amole Mar 2021

Effects Of Ingestion By Cattle On Germinability Of Seeds Of Three Different Browse Plants, Alaba O. Jolaosho, B. O. Oduguwa, O. M. Arigbede, A. O. Olanite, Olufemi S. Onifade, Y. U. Anele, G. A. Amole

IGC Proceedings (1977-2023)

No abstract provided.


Effects Of Marsh Management In Coastal Marsh Impoundments On Marsh Vertical Accretion In The Face Of Sea Level Rise., Scott P. Graham Mar 2021

Effects Of Marsh Management In Coastal Marsh Impoundments On Marsh Vertical Accretion In The Face Of Sea Level Rise., Scott P. Graham

LSU Master's Theses

Many coastal marshes are managed for wildlife through the use of levees and water control structures. Management techniques such as water manipulation, herbicide application, and controlled burns are used to set back succession and facilitate recruitment of annual plant species, which are highly sought after by many wildlife. These marsh impoundments alter or prevent natural tidal exchange, which might alter or prevent sediment and nutrient inputs to the marsh. Although these management techniques are effective in managing for wildlife, there are few studies comparing vertical accretion between managed and unmanaged marshes. Vertical accretion is important because it allows coastal wetlands …


Effects Of Different Salts And Concentrations On Germination And Growth Of Leymus Chinensis, L. H. Huang, Z. W. Liang, H. Y. Ma, M. Liu, C. Yan, Z. C. Wang Mar 2021

Effects Of Different Salts And Concentrations On Germination And Growth Of Leymus Chinensis, L. H. Huang, Z. W. Liang, H. Y. Ma, M. Liu, C. Yan, Z. C. Wang

IGC Proceedings (1977-2023)

No abstract provided.


Effects Of Grazing On Wind Driven Matter Fluxes In The Xilingele Grassland, Inner Mongolia, C. Hoffmann, R. Funk Mar 2021

Effects Of Grazing On Wind Driven Matter Fluxes In The Xilingele Grassland, Inner Mongolia, C. Hoffmann, R. Funk

IGC Proceedings (1977-2023)

No abstract provided.


Desertification Mapping By Iranian Classification Of Desertification (Icd) Method Case Study: Kohdasht Watershed In Iran, G. R. Zehtabian, G. R. Chamanpira, H. Ahmadi, H. Khosravi Mar 2021

Desertification Mapping By Iranian Classification Of Desertification (Icd) Method Case Study: Kohdasht Watershed In Iran, G. R. Zehtabian, G. R. Chamanpira, H. Ahmadi, H. Khosravi

IGC Proceedings (1977-2023)

No abstract provided.


Energy Balance Analysis Of Integrated Crop‐Livestock Production System In Tianshui Town, Huanxian County Of Gansu Province, Xiaoyan Wang, Fujiang Hou, Randall Jones Mar 2021

Energy Balance Analysis Of Integrated Crop‐Livestock Production System In Tianshui Town, Huanxian County Of Gansu Province, Xiaoyan Wang, Fujiang Hou, Randall Jones

IGC Proceedings (1977-2023)

No abstract provided.


Effect Of Oxytropis Species Consumption On Sheep Forage Preference In Northeastern Qing‐Tibetan Plateau, Shengyao Wang, Kun Wang, Yonglai Zh. Mar 2021

Effect Of Oxytropis Species Consumption On Sheep Forage Preference In Northeastern Qing‐Tibetan Plateau, Shengyao Wang, Kun Wang, Yonglai Zh.

IGC Proceedings (1977-2023)

No abstract provided.


Effect Of Sexual Reproduction And Seedling Recruitment On Vegetation Dynamics In Grasslands, Christian Huyghe, Isabelle Litrico, F. I. Martinez, M. Philip Rolston Mar 2021

Effect Of Sexual Reproduction And Seedling Recruitment On Vegetation Dynamics In Grasslands, Christian Huyghe, Isabelle Litrico, F. I. Martinez, M. Philip Rolston

IGC Proceedings (1977-2023)

No abstract provided.


Seed Production Of Native Grassland Plants, M. Philip Rolston, Christian Huyghe Mar 2021

Seed Production Of Native Grassland Plants, M. Philip Rolston, Christian Huyghe

IGC Proceedings (1977-2023)

No abstract provided.


Establishment And Effects On Soil And Pasture Of Diverse Arrangements Of Acacia Decurrens, Acacia Melanoxylon And Alnus Acuminata As Silvopasture Systems In The High Tropic In Colombia, A. Conde, L. L. Betancourt, C. J. Jaramillo, A. Umaña, D. Barrera, D. R. Chamorro Mar 2021

Establishment And Effects On Soil And Pasture Of Diverse Arrangements Of Acacia Decurrens, Acacia Melanoxylon And Alnus Acuminata As Silvopasture Systems In The High Tropic In Colombia, A. Conde, L. L. Betancourt, C. J. Jaramillo, A. Umaña, D. Barrera, D. R. Chamorro

IGC Proceedings (1977-2023)

No abstract provided.


Sustainable Agricultural And Rural Development In Semi‐Arid Environment When Supplementing Rainfall With 200 Mm Irrigation Water Per Year, Benzarti Jalila, Ben Youssef Salah Mar 2021

Sustainable Agricultural And Rural Development In Semi‐Arid Environment When Supplementing Rainfall With 200 Mm Irrigation Water Per Year, Benzarti Jalila, Ben Youssef Salah

IGC Proceedings (1977-2023)

No abstract provided.