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Articles 67861 - 67890 of 302581

Full-Text Articles in Physical Sciences and Mathematics

Modeling Biotic & Abiotic Drivers Affecting Biogeomorphic Coastal Foredunes, Bianca Charbonneau Nov 2020

Modeling Biotic & Abiotic Drivers Affecting Biogeomorphic Coastal Foredunes, Bianca Charbonneau

Sustainability Seminar Series

Coastal dunes are exceptionally dynamic terrestrial habitats that will only grow increasingly vulnerable with climate change. A structured approach to protect and restore these and other coastal biogeomorphic interface habitats is needed to maintain their invaluable ecosystem services. Vegetation in these habitats acts as ecosystem engineers such that, to achieve this, one must understand and accurately forecast vegetation dynamics at the nexus of shifting abiotic conditions and drivers of change. We developed a process-based model for coastal dune vegetation ecology, specifically, growth, density, and colonization as it affects and is affected by shifting habitat topography and storm event impact. The …

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Self-Immolative Polymers As A Degradable And Triggerable Class Of Surfactants, Siamak Keshtpour Nov 2020

Self-Immolative Polymers As A Degradable And Triggerable Class Of Surfactants, Siamak Keshtpour

Electronic Thesis and Dissertation Repository

Self-immolative polymers (SIPs) are degradable polymers that undergo end-to-end depolymerization upon triggering. They have potential for the development of degradable surfactants addressing human and environmental toxicity concerns associated with non-degradable surfactants, but they have not yet been investigated as surfactants. Herein, polyglyoxylamide SIPs with different pendent groups and end-caps were synthesized, envisioning they could serve as depolymerizable analogues of poly(vinyl alcohol) and its derivatives. Polyglyoxylamides with pendent hydroxyls stabilized both PEA and PLA particle suspensions. They showed the potential to undergo triggered degradation, resulting in destabilization of the suspensions. However, untriggered suspensions exhibited poor long-term stability, so further structural tuning …

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Shrinking Salmon: Is Climate Change Linked To Animal Body Size?, Monica D. Bacchus Nov 2020

Shrinking Salmon: Is Climate Change Linked To Animal Body Size?, Monica D. Bacchus

Scientific Communication News

No abstract provided.

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Linking Mosquito Surveillance To Dengue Fever Through Bayesian Mechanistic Modeling, Clinton B. Leach, Jennifer A. Hoeting, Kim M. Pepin, Alvaro E. Eiras, Mevin B. Hooten, Colleen T. Webb Nov 2020

Linking Mosquito Surveillance To Dengue Fever Through Bayesian Mechanistic Modeling, Clinton B. Leach, Jennifer A. Hoeting, Kim M. Pepin, Alvaro E. Eiras, Mevin B. Hooten, Colleen T. Webb

United States Department of Agriculture Wildlife Services: Staff Publications

Our ability to effectively prevent the transmission of the dengue virus through targeted control of its vector, Aedes aegypti, depends critically on our understanding of the link between mosquito abundance and human disease risk. Mosquito and clinical surveillance data are widely collected, but linking them requires a modeling framework that accounts for the complex non-linear mechanisms involved in transmission. Most critical are the bottleneck in transmission imposed by mosquito lifespan relative to the virus’ extrinsic incubation period, and the dynamics of human immunity. We developed a differential equation model of dengue transmission and embedded it in a Bayesian hierarchical …

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Development Of A Mobile Ten Frames App For Philippine K-12 Schools, Debbie Marie Versoza, Ma. Louise Antonette N. De Las Peñas, Jumela F. Sarmiento, Mark Anthony C. Tolentino, Mark L. Loyola Nov 2020

Development Of A Mobile Ten Frames App For Philippine K-12 Schools, Debbie Marie Versoza, Ma. Louise Antonette N. De Las Peñas, Jumela F. Sarmiento, Mark Anthony C. Tolentino, Mark L. Loyola

Mathematics Faculty Publications

This paper reports on the Quick Images app, whose design framework is informed by research on ten-structured thinking and gamification principles. Inclusivity was also a major consideration, especially in the context of a developing country. Thus, the app was made freely available and required only moderate system requirements. Pilot studies revealed that the app has the potential to promote children’s ability to see two-digit numbers in relation to tens and ones, which is a major goal of elementary school mathematics. Collaborations with the Philippine Department of Education to ensure the app’s sustained use are also discussed.

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Response Of The Mode Grüneisen Parameters With Anisotropic Compression: A Pressure And Temperature Dependent Raman Study Of Β-Sn, Jasmine K. Hinton, Christian Childs, Dean Smith, Paul B. Ellison, Keith V. Lawler, Ashkan Salamat Nov 2020

Response Of The Mode Grüneisen Parameters With Anisotropic Compression: A Pressure And Temperature Dependent Raman Study Of Β-Sn, Jasmine K. Hinton, Christian Childs, Dean Smith, Paul B. Ellison, Keith V. Lawler, Ashkan Salamat

Physics & Astronomy Faculty Research

The lattice dynamic response of body-centered tetragonal β−Sn (I41/amd) under high pressure and -temperature conditions is determined using experimental optical vibration modes. Raman scattering is used to map the phase stability region of β−Sn to perform mode Grüneisen analysis, and we demonstrate the necessity of an optical intensity calibration for Raman thermometry. The Grüneisen tensor is evaluated along a set of isotherms to address shortcomings of single-mode Grüneisen parameters with respect to anisotropic deformations of this tetragonal structured soft metal. The changes observed here in the Grüneisen tensor as a function of temperature are related to anharmonicity and denote potential …

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Livestock Diversity And Climate Change In Rangelands, Irene Hoffmann, Beate Scherf, David Boerma Nov 2020

Livestock Diversity And Climate Change In Rangelands, Irene Hoffmann, Beate Scherf, David Boerma

IGC Proceedings (1993-2023)

No abstract provided.

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Spatial Patterns Of Main Species Of The Grassland Community In The Recovering Succession In Wangong Sandy Land, Chen Wei Nov 2020

Spatial Patterns Of Main Species Of The Grassland Community In The Recovering Succession In Wangong Sandy Land, Chen Wei

IGC Proceedings (1993-2023)

No abstract provided.

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Study On Temporal‐Spatial Variability Of Climatic Factors And Its Influence On Net Primary Production Of Grassland In Inner Mongolia, China, Guogang Zhang, Yumei Kang Nov 2020

Study On Temporal‐Spatial Variability Of Climatic Factors And Its Influence On Net Primary Production Of Grassland In Inner Mongolia, China, Guogang Zhang, Yumei Kang

IGC Proceedings (1993-2023)

No abstract provided.

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The Effect Of Climate Change On Livestock Carrying Capacity Of Inner Mongolia, Yurong Wei, Ruiqing Guo, Xuebiao Pan, Buju Long Nov 2020

The Effect Of Climate Change On Livestock Carrying Capacity Of Inner Mongolia, Yurong Wei, Ruiqing Guo, Xuebiao Pan, Buju Long

IGC Proceedings (1993-2023)

No abstract provided.

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Carbon Sequestration Potential Of Organic Pasture In Thailand, Thumrongsakd Phonbumrung, Suriyapong Watanasak, Chirapol Sintunawa, Charlie Navanukraha Nov 2020

Carbon Sequestration Potential Of Organic Pasture In Thailand, Thumrongsakd Phonbumrung, Suriyapong Watanasak, Chirapol Sintunawa, Charlie Navanukraha

IGC Proceedings (1993-2023)

No abstract provided.

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Spatial Pattern And Uncertainty Of Soil Organic Carbon And Implications For Sampling Design, Feng Liu, Xinyuan Ben Wu, E. Bai, Thomas W. Boutton, Steven R. Archer Nov 2020

Spatial Pattern And Uncertainty Of Soil Organic Carbon And Implications For Sampling Design, Feng Liu, Xinyuan Ben Wu, E. Bai, Thomas W. Boutton, Steven R. Archer

IGC Proceedings (1993-2023)

No abstract provided.

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Effects Of Ice Encasement During Winter On Different Cultivars Of Phleum Pratense And Lolium Perenne In Norway, M. Jørgensen, Liv Østrem, A. K. Bakken, Mats Höglind Nov 2020

Effects Of Ice Encasement During Winter On Different Cultivars Of Phleum Pratense And Lolium Perenne In Norway, M. Jørgensen, Liv Østrem, A. K. Bakken, Mats Höglind

IGC Proceedings (1993-2023)

No abstract provided.

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Study On Methane Diurnal Emission Nearby Cuona Lake In Naqu Of Tibet With Different Humidity, Zhongxin Zhang, Yunfan Wan, Yu'e Li, Qingzhu Gao Nov 2020

Study On Methane Diurnal Emission Nearby Cuona Lake In Naqu Of Tibet With Different Humidity, Zhongxin Zhang, Yunfan Wan, Yu'e Li, Qingzhu Gao

IGC Proceedings (1993-2023)

No abstract provided.

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A Modeling Study On The Influence Of Sea-Level Rise And Channel Deepening On Estuarine Circulation And Dissolved Oxygen Levels In The Tidal James River, Virginia, Usa, Ya Wang, Jian Shen Nov 2020

A Modeling Study On The Influence Of Sea-Level Rise And Channel Deepening On Estuarine Circulation And Dissolved Oxygen Levels In The Tidal James River, Virginia, Usa, Ya Wang, Jian Shen

VIMS Articles

The impact of channel deepening and sea-level rise on the environmental integrity of an estuary is investigated using a three-dimensional hydrodynamic-eutrophication model. The model results show that dissolved oxygen (DO) only experienced minor changes, even when the deep channel was deepened by 3 m in the mesohaline and polyhaline regions of the James River. We found that vertical stratification decreased DO aeration while the estuarine gravitational circulation increased bottom DO exchange. The interactions between these two processes play an important role in modulating DO. The minor change in DO due to channel deepening indicates that the James River is unique …

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An Analysis Of Growth Of The Community Integration Psychological Score In An Ethnically Diverse Population Experiencing Homelessness In A Permanent Supportive Housing Program Using Hierarchical Mixed Modeling, Leah Hollis Puglisi Nov 2020

An Analysis Of Growth Of The Community Integration Psychological Score In An Ethnically Diverse Population Experiencing Homelessness In A Permanent Supportive Housing Program Using Hierarchical Mixed Modeling, Leah Hollis Puglisi

Mathematics & Statistics ETDs

Hierarchical models are becoming increasingly common in epidemiological and psychological research. When analyzing data from such studies, the nested structure of the data must be taken into account. Mixed modeling in conjunction with hierarchical mixed modeling allows researchers to ask broad questions about the population of interest. Modeling under restricted maximum likelihood estimation (REML), as opposed to full maximum likelihood estimation (ML), increases the accuracy of estimates for the random effects in the model. We use hierarchical mixed modeling under REML estimation to analyze which factors increase “community integration”, a concept and a construct developed and used in the mental …

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Cationic Boron Formazanate Dyes, Benjamin D. Katzman, Paul D. Boyle, Viktor N. Staroverov, Joe Gilroy, Ryan R. Maar Nov 2020

Cationic Boron Formazanate Dyes, Benjamin D. Katzman, Paul D. Boyle, Viktor N. Staroverov, Joe Gilroy, Ryan R. Maar

Chemistry Publications

Incorporation of cationic boron atoms into molecular frameworks is an established strategy for creating chemical species with unusual bonding and reactivity but is rarely thought of as a way of enhancing molecular optoelectronic properties. Using boron formazanate dyes as examples, we demonstrate that the wavelengths, intensities, and type of the first electronic transitions in BN heterocycles can be modulated by varying the charge, coordination number, and supporting ligands at the cationic boron atom. UV‐vis absorption spectroscopy measurements and density‐functional (DFT) calculations show that these modulations are caused by changes in the geometry and extent of π‐conjugation of the boron formazanate …

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Grim Under A Compensation Variant, Aaron Davis, Aaron Davis Nov 2020

Grim Under A Compensation Variant, Aaron Davis, Aaron Davis

Honors College Theses

Games on graphs are a well studied subset of combinatorial games. Balance and strategies for winning are often looked at in these games. One such combinatorial graph game is Grim. Many of the winning strategies of Grim are already known. We note that many of these winning strategies are only available to the first player. Hoping to develop a fairer Grim, we look at Grim played under a slighlty different rule set. We develop winning strategies and known outcomes for this altered Grim. Throughout, we discuss whether our altered Grim is a fairer game then the original.

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Carbon Dynamics (2000-2006) Over The Northern Great Plains Grasslands, Li Zhang, Bruce Wylie, Lei Ji, Tagir Gilmanov, Larry L. Tieszen Nov 2020

Carbon Dynamics (2000-2006) Over The Northern Great Plains Grasslands, Li Zhang, Bruce Wylie, Lei Ji, Tagir Gilmanov, Larry L. Tieszen

IGC Proceedings (1993-2023)

No abstract provided.

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The Improvement Of Degraded Permanent Grasslands By Grazing In The Ne Romania, C. Samuil, V. Vintu, T. Iacob, I. C. Popovici Nov 2020

The Improvement Of Degraded Permanent Grasslands By Grazing In The Ne Romania, C. Samuil, V. Vintu, T. Iacob, I. C. Popovici

IGC Proceedings (1993-2023)

No abstract provided.

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Seed Protein Variability And Abiotic Stress In Naturalised Italian Ryegrass (Lolium Multiflorum Lam.), Mónica B. Sacido, Ezequiel M. Latorre, W. John Rogers Nov 2020

Seed Protein Variability And Abiotic Stress In Naturalised Italian Ryegrass (Lolium Multiflorum Lam.), Mónica B. Sacido, Ezequiel M. Latorre, W. John Rogers

IGC Proceedings (1993-2023)

No abstract provided.

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Forming Mechanism And Classification Standard Of "Black-Soil-Type" Degraded Grassland In Yangtze And Yellow River Headwater Region Of Qinghai-Tibetan Plateau, Y. S. Ma, Q. M. Dong, S. H. Yang, J. J. Shi, L. Sheng, Y. L. Wang, X. D. Sun Nov 2020

Forming Mechanism And Classification Standard Of "Black-Soil-Type" Degraded Grassland In Yangtze And Yellow River Headwater Region Of Qinghai-Tibetan Plateau, Y. S. Ma, Q. M. Dong, S. H. Yang, J. J. Shi, L. Sheng, Y. L. Wang, X. D. Sun

IGC Proceedings (1993-2023)

No abstract provided.

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The Characteristic Of Mg Alkali Soil Developed In Tu Mo Chuan Plain, Mei Hong, Ligeng Wu, Chengming Chen Nov 2020

The Characteristic Of Mg Alkali Soil Developed In Tu Mo Chuan Plain, Mei Hong, Ligeng Wu, Chengming Chen

IGC Proceedings (1993-2023)

No abstract provided.

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Amelioration Of Natural Grasslands In The High Ranges Of Kerala, India, P. Girijavallabhan Nov 2020

Amelioration Of Natural Grasslands In The High Ranges Of Kerala, India, P. Girijavallabhan

IGC Proceedings (1993-2023)

No abstract provided.

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Super Sudoku Squares, Dean Hoffman Nov 2020

Super Sudoku Squares, Dean Hoffman

Communications on Number Theory and Combinatorial Theory

We refer to a completed Sudoku puzzle as a Sudoku Square of order 3. We define a more restricted, but natural, extension --- a Super Sudoku Square of order n, and determine for which orders n one exists.

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Cyclization Of Peptide Structures By Creating Metal Foldamers Using 99m-Tc/Re(Co)3, Dhvani D. Oza Nov 2020

Cyclization Of Peptide Structures By Creating Metal Foldamers Using 99m-Tc/Re(Co)3, Dhvani D. Oza

Electronic Thesis and Dissertation Repository

Constrained peptides have been successful as therapeutics owing to the rigidity in their framework, allowing them to have enhanced pharmacological properties. Apart from covalent bond based cyclization, constraints can be induced by cyclization using metal coordination. The metals Re and 99mTc are one of the few metals which have not been studied in great detail for their ability to cyclize linear peptides. A tri-alanine sequence was employed in the peptide backbone due to its ability to form stable helices. In addition, another tripeptide sequence RGD, which is recognized by the integrin avb3, was also used. …

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Grassland Production Under Various Meteorological Conditions In Xilingol, Inner Mongolia, China, Ruhan Yi, Masae Shiyomi, Likun Ai Nov 2020

Grassland Production Under Various Meteorological Conditions In Xilingol, Inner Mongolia, China, Ruhan Yi, Masae Shiyomi, Likun Ai

IGC Proceedings (1993-2023)

No abstract provided.

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Managing Carbon Sources And Sinks In Australia's Rangelands And Tropical Savannas, Richard J. Williams, L. B. Hutley, J. Beringer, G. D. Cook, J. Russell‐Smith, L. Liedloff Nov 2020

Managing Carbon Sources And Sinks In Australia's Rangelands And Tropical Savannas, Richard J. Williams, L. B. Hutley, J. Beringer, G. D. Cook, J. Russell‐Smith, L. Liedloff

IGC Proceedings (1993-2023)

No abstract provided.

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Methane Seasonal Emission From Mongolian Sheep Fed Leymus Chinensis, Yongxin Wang, Shiping Wang Nov 2020

Methane Seasonal Emission From Mongolian Sheep Fed Leymus Chinensis, Yongxin Wang, Shiping Wang

IGC Proceedings (1993-2023)

No abstract provided.

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A Significant Excess In Major Merger Rate For Agns With The Highest Eddington Ratios At Z < 0.2, Victor Marian, Knud Jahnke, Irham Andika, Eduardo Bañados, Vardha N. Bennert, Seth Cohen, Bernd Husemann, Melanie Kaasinen, Anton M. Koekemoer, Mira Mechtley, Masafusa Onoue, Jan-Torge Schindler, Malte Schramm, Andreas Schulze, John D. Silverman, Irina Smirnova-Pinchukova, Arjen Van Der Wel, Carolin Villforth, Rogier A. Windhorst Nov 2020

A Significant Excess In Major Merger Rate For Agns With The Highest Eddington Ratios At Z < 0.2, Victor Marian, Knud Jahnke, Irham Andika, Eduardo Bañados, Vardha N. Bennert, Seth Cohen, Bernd Husemann, Melanie Kaasinen, Anton M. Koekemoer, Mira Mechtley, Masafusa Onoue, Jan-Torge Schindler, Malte Schramm, Andreas Schulze, John D. Silverman, Irina Smirnova-Pinchukova, Arjen Van Der Wel, Carolin Villforth, Rogier A. Windhorst

Physics

Observational studies are increasingly finding evidence against major mergers being the dominant mechanism responsible for triggering an active galactic nucleus (AGN). After studying the connection between major mergers and AGNs with the highest Eddington ratios at z = 2, we here expand our analysis to z < 0.2, exploring the same AGN parameter space. Using ESO VLT/FORS2 B-, V-, and color images, we examine the morphologies of 17 galaxies hosting AGNs with Eddington ratios , and 25 mass- and redshift-matched control galaxies. To match the appearance of the two samples, we add synthetic point sources to the inactive comparison galaxies. The combined sample of AGN and inactive galaxies was …

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