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2021

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Articles 27271 - 27300 of 27755

Full-Text Articles in Physical Sciences and Mathematics

A Global Ecological Classification Of Coastal Segment Units To Complement Marine Biodiversity Observation Network Assessments, Roger Sayre, Kevin Butler, Keith Van Graafeiland, Sean Breyer, Dawn Wright, Charlie Frye, Deniz Karagulle, Madeline Martin, Jill Cress, Tom Allen, Rebecca J. Allee, Rost Parsons, Bjorn Nyberg, Mark J. Costello, Peter Harris, Frank E. Muller-Karger Jan 2021

A Global Ecological Classification Of Coastal Segment Units To Complement Marine Biodiversity Observation Network Assessments, Roger Sayre, Kevin Butler, Keith Van Graafeiland, Sean Breyer, Dawn Wright, Charlie Frye, Deniz Karagulle, Madeline Martin, Jill Cress, Tom Allen, Rebecca J. Allee, Rost Parsons, Bjorn Nyberg, Mark J. Costello, Peter Harris, Frank E. Muller-Karger

Political Science & Geography Faculty Publications

A new data layer provides Coastal and Marine Ecological Classification Standard (CMECS) labels for global coastal segments at 1 km or shorter resolution. These characteristics are summarized for six US Marine Biodiversity Observation Network (MBON) sites and one MBON Pole to Pole of the Americas site in Argentina. The global coastlines CMECS classifications were produced from a partitioning of a 30 m Landsat-derived shoreline vector that was segmented into 4 million 1 km or shorter segments. Each segment was attributed with values from 10 variables that represent the ecological settings in which the coastline occurs, including properties of the adjacent …


Gauge-Invariant Tmd Factorization For Drell-Yan Hadronic Tensor At Small X, Ian Balitsky Jan 2021

Gauge-Invariant Tmd Factorization For Drell-Yan Hadronic Tensor At Small X, Ian Balitsky

Physics Faculty Publications

The Drell-Yan hadronic tensor for electromagnetic (EM) current is calculated in the Sudakov region s ≫ Q2 ≫q⊥2 with 1Q² accuracy, first at the tree level and then with the double-log accuracy. It is demonstrated that in the leading order in Nc the higher-twist quark-quark-gluon TMDs reduce to leading-twist TMDs due to QCD equation of motion. The resulting tensor for unpolarized hadrons is EM gauge-invariant and depends on two leading-twist TMDs: f1 responsible for total DY cross section, and Boer-Mulders function h1⊥. The order-of-magnitude estimates of angular distributions for DY …


In-Plane Quasi-Single-Domain Batio3 Via Interfacial Symmetry Engineering, J. W. Lee, K. Eom, Tula R. Paudel, B. Wang, Haidong Lu, H. X. Huyan, S. Lindemann, S. Ryu, H. Lee, T. H. Kim, Y. Yuan, J. A. Zorn, W. P. Gao, Thomas Tybell, V. Gopalan, X. Q. Pan, Alexei Gruverman, L. Q. Chen, Evgeny Y. Tsymbal, Chang-Beom Eom Jan 2021

In-Plane Quasi-Single-Domain Batio3 Via Interfacial Symmetry Engineering, J. W. Lee, K. Eom, Tula R. Paudel, B. Wang, Haidong Lu, H. X. Huyan, S. Lindemann, S. Ryu, H. Lee, T. H. Kim, Y. Yuan, J. A. Zorn, W. P. Gao, Thomas Tybell, V. Gopalan, X. Q. Pan, Alexei Gruverman, L. Q. Chen, Evgeny Y. Tsymbal, Chang-Beom Eom

Evgeny Tsymbal Publications

The control of the in-plane domain evolution in ferroelectric thin films is not only critical to understanding ferroelectric phenomena but also to enabling functional device fabrication. However, in-plane polarized ferroelectric thin films typically exhibit complicated multidomain states, not desirable for optoelectronic device performance. Here we report a strategy combining interfacial symmetry engineering and anisotropic strain to design singledomain, in-plane polarized ferroelectric BaTiO3 thin films. Theoretical calculations predict the key role of the BaTiO3/PrScO3 (110)O substrate interfacial environment, where anisotropic strain, monoclinic distortions, and interfacial electrostatic potential stabilize a single-variant spontaneous polarization. A combination …


Spin-Neutral Currents For Spintronics, Ding-Fu Shao, Shu-Hui Zhang, Ming Li, Chang-Beom Eom, Evgeny Y. Tsymbal Jan 2021

Spin-Neutral Currents For Spintronics, Ding-Fu Shao, Shu-Hui Zhang, Ming Li, Chang-Beom Eom, Evgeny Y. Tsymbal

Evgeny Tsymbal Publications

Electric currents carrying a net spin polarization are widely used in spintronics, whereas globally spin-neutral currents are expected to play no role in spin-dependent phenomena. Here we show that, in contrast to this common expectation, spin-independent conductance in compensated antiferromagnets and normal metals can be efficiently exploited in spintronics, provided their magnetic space group symmetry supports a non-spin-degenerate Fermi surface. Due to their momentum-dependent spin polarization, such antiferromagnets can be used as active elements in antiferromagnetic tunnel junctions (AFMTJs) and produce a giant tunneling magnetoresistance (TMR) effect. Using RuO2 as a representative compensated antiferromagnet exhibiting spin-independent conductance along the …


Reversal Of The Magnetoelectric Effect At A Ferromagnetic Metal/Ferroelectric Hfo2 Interface Induced By Metal Oxidation, Zhaojin Chen, Qiong Yang, Lingling Tao, Evgeny Y. Tsymbal Jan 2021

Reversal Of The Magnetoelectric Effect At A Ferromagnetic Metal/Ferroelectric Hfo2 Interface Induced By Metal Oxidation, Zhaojin Chen, Qiong Yang, Lingling Tao, Evgeny Y. Tsymbal

Evgeny Tsymbal Publications

Multiferroic materials composed of ferromagnetic and ferroelectric components are interesting for technological applications due to sizable magnetoelectric coupling allowing the control of magnetic properties by electric fields. Due to being compatible with the silicon-based technology, HfO2-based ferroelectrics could serve as a promising component in the composite multiferroics. Recently, a strong charge-mediated magnetoelectric coupling has been predicted for a Ni/HfO2 multiferroic heterostructure. Here, using density functional theory calculations, we systematically study the effects of the interfacial oxygen stoichiometry relevant to experiments on the magnetoelectric effect at the Ni/HfO2 interface. We demonstrate that the magnetoelectric effect is very …


Temporal Coherent Control Of Resonant Two-Photon Double Ionization Of The Hydrogen Molecule Via Doubly Excited States, Jean Marcel Ngoko Djiokap, Anthony F. Starace Jan 2021

Temporal Coherent Control Of Resonant Two-Photon Double Ionization Of The Hydrogen Molecule Via Doubly Excited States, Jean Marcel Ngoko Djiokap, Anthony F. Starace

Anthony F. Starace Publications

We use time-delayed, counter-rotating, circularly polarized few-cycle attosecond nonoverlapping pulses to study the temporal coherent control of the resonant process of two-photon double ionization (TPDI) of hydrogen molecule via doubly excited states for pulse propagation direction along ˆk either parallel or perpendicular to the molecular axis ˆR. For ˆk ‖ ˆR and a pulse carrier frequency of 36 eV resonantly populating the Q2 1∏ + u (1) doubly excited state as well as other 1∏ + u doubly excited states, we find that the indirect ionization pathway through these doubly excited states changes the character of the kinematical vortex-shaped …


Regular And In-Plane Skyrmions And Antiskyrmions From Boundary Instabilities, Shane Sandhoefner, Aldo Raeliarijaona, Rabindra Nepal, Dalton Snyder-Tinoco, Alexey Kovalev Jan 2021

Regular And In-Plane Skyrmions And Antiskyrmions From Boundary Instabilities, Shane Sandhoefner, Aldo Raeliarijaona, Rabindra Nepal, Dalton Snyder-Tinoco, Alexey Kovalev

Department of Physics and Astronomy: Faculty Publications

We formulate a theory of skyrmion and antiskyrmion generation using magnetic field and charge current pulses. We show that the topological defect can be created at an edge of a system with Dzyaloshinskii-Moriya interaction (DMI) as well as at a boundary between regions with different DMI. We consider both perpendicular and in-plane (also known as magnetic bimerons) versions of skyrmions and antiskyrmions. We show that the magnetization twist in the vicinity of an edge or a boundary is described by a kink solution, the presence of which can instigate the generation of topological defects. We study the collective excitations of …


Spin Superfluidity In Noncollinear Antiferromagnets, Bo Li, Alexey Kovalev Jan 2021

Spin Superfluidity In Noncollinear Antiferromagnets, Bo Li, Alexey Kovalev

Alexey Kovalev Papers

We explore the spin superfluid transport in exchange interaction-dominated three-sublattice antiferromagnets. The system in the long-wavelength regime is described by an SO(3) invariant field theory. Additional corrections from Dzyaloshinskii-Moriya interactions or anisotropies can break the symmetry; however, the system still approximately holds a U(1)-rotation symmetry. Thus, the power-law spatial decay signature of spin superfluidity is identified in a nonlocal-measurement setup where the spin injection is described by the generalized spin-mixing conductance. We suggest iron jarosites as promising material candidates for realizing our proposal.


Spirals And Skyrmions In Antiferromagnetic Triangular Lattices, Wuzhang Fang, Aldo Raeliarijaona, Po-Hao Chang, Alexey Kovalev, K. D. Belashchenko Jan 2021

Spirals And Skyrmions In Antiferromagnetic Triangular Lattices, Wuzhang Fang, Aldo Raeliarijaona, Po-Hao Chang, Alexey Kovalev, K. D. Belashchenko

Alexey Kovalev Papers

We study realizations of spirals and skyrmions in two-dimensional antiferromagnets with a triangular lattice on an inversion-symmetry-breaking substrate. As a possible material realization, we investigate the adsorption of transition-metal atoms (Cr, Mn, Fe, or Co) on a monolayer of MoS2, WS2, or WSe2 and obtain the exchange, anisotropy, and Dzyaloshinskii-Moriya interaction parameters using first-principles calculations. Using energy minimization and parallel-tempering Monte Carlo simulations, we determine the magnetic phase diagrams for a wide range of interaction parameters. We find that skyrmion lattices can appear even with weak Dzyaloshinskii-Moriya interactions, but their stability is hindered by magnetic anisotropy. However, a weak easy …


Challenges Of Brush Management Treatment Effectiveness In Southern Great Plains, United States, Rheinhardt Scholtz, Samuel D. Fuhlendorf, Daniel R. Uden, Brady W. Allred, Matthew O. Jones, David E. Naugle, Dirac Twidwell Jan 2021

Challenges Of Brush Management Treatment Effectiveness In Southern Great Plains, United States, Rheinhardt Scholtz, Samuel D. Fuhlendorf, Daniel R. Uden, Brady W. Allred, Matthew O. Jones, David E. Naugle, Dirac Twidwell

School of Natural Resources: Faculty Publications

Woodland expansion is a global challenge documented under varying degrees of disturbance, climate, and land ownership patterns. In North American rangelands, mechanical and chemical brush management practices and prescribed fire are frequently promoted by agencies and used by private landowners to reduce woody plant cover. We assess the distribution of agency-supported cost sharing of brush management (2000−2017) in the southern Great Plains, United States, and evaluate the longevity of treatment application. We test the general expectation that the current brush management paradigm in the southern Great Plains reduces woody plants and conserves rangeland resources at broad scales. This study represents …


The 3H/3He Groundwater Age-Dating Method And Applications, Troy E. Gilmore, Mikaela L. Cherry, Didier Gastmans, Douglas Kip Solomon, Eric Christopher Humphrey Jan 2021

The 3H/3He Groundwater Age-Dating Method And Applications, Troy E. Gilmore, Mikaela L. Cherry, Didier Gastmans, Douglas Kip Solomon, Eric Christopher Humphrey

School of Natural Resources: Faculty Publications

Groundwater age-dating is an important tool for quantifying and managing water resources. Groundwater age is the elapsed time between recharge (at the land surface or water table) and the time when groundwater is sampled. If groundwater is sampled at the point of discharge from an aquifer, then the age represents the groundwater transit time. Groundwater that has recharged in recent decades is considered young groundwater. In many areas, the quality and quantity of young groundwater has been impacted by human activities and groundwater age-dating is useful for quantifying current and historical water and contaminant fluxes into and through aquifers. This …


Diets Of Double-Crested Cormorants In The Lake Winnebago System, Wisconsin, Ryan P. Koenigs, Daniel J. Dembkowski, Charles D. Lovell, Daniel A. Isermann, Adam D. Nickel Jan 2021

Diets Of Double-Crested Cormorants In The Lake Winnebago System, Wisconsin, Ryan P. Koenigs, Daniel J. Dembkowski, Charles D. Lovell, Daniel A. Isermann, Adam D. Nickel

United States Department of Agriculture Wildlife Services: Staff Publications

Double-crested cormorant Phalacrocorox auritus Lesson (cormorant) populations have increased throughout the Great Lakes region of North America causing concern related to the impact of cormorant predation on fish communities. A recent decline in yellow perch Perca flavescens (Mitchill) abundance within the Lake Winnebago System, Wisconsin, USA, prompted an assessment of cormorant diets to evaluate potential effects of cormorant predation on the sportfish community. Diets were collected from 883 cormorants (417 from Lake Winnebago and 466 from Lake Butte des Morts) between 2015 and 2017. Cormorant diets on both waterbodies consisted mostly of freshwater drum Aplodinotus grunniens Rafinesque and gizzard shad …


Raw And Pure Education In The Society, Iwasan D. Kejawa Jan 2021

Raw And Pure Education In The Society, Iwasan D. Kejawa

Department of Educational Administration: Dissertations, Theses, and Student Research

What does education mean to individuals in the world today? Education is a way one can attain or improve his or her ability to lead and survive in the society of ours. Without educational training of the mind, it may be impossible to realize the importance of adaptability of living in the environment. Without education, It may also be difficult to embellish the use of both the mental and physical attributes possessed by individual beings.

What really is education? Education is the training of the mind to perform desire functions or to perpetuate the modality of obtaining an end or …


Peroxo Species Formed In The Bulk Of Silicate Cathodes, Zhenlian Chen, Bjoern Schwartz, Xianhui Zhang, Wenqiang Du, Lirong Zheng, Ailing Tian, Ying Zhang, Zhiyong Zhang, Xiao Cheng Zeng, Zhifeng Zhang, Liyuan Huai, Jinlei Wu, Helmut Ehrenberg, Deyu Wang, Jun Li Jan 2021

Peroxo Species Formed In The Bulk Of Silicate Cathodes, Zhenlian Chen, Bjoern Schwartz, Xianhui Zhang, Wenqiang Du, Lirong Zheng, Ailing Tian, Ying Zhang, Zhiyong Zhang, Xiao Cheng Zeng, Zhifeng Zhang, Liyuan Huai, Jinlei Wu, Helmut Ehrenberg, Deyu Wang, Jun Li

Department of Chemistry: Faculty Publications

Oxygen redox in Li-rich oxides may boost the energy density of lithium-ion batteries by incorporating oxygen chemistry in solid cathodes. However, oxygen redox in the bulk usually entangles with voltage hysteresis and oxygen release, resulting in a prolonged controversy in literature on oxygen transformation. Here, we report spectroscopic evidence of peroxo species formed and confined in silicate cathodes amid oxygen redox at high voltage, accompanied by Co2+/Co3+ redox dominant at low voltage. First-principles calculations reveal that localized electrons on dangling oxygen drive the OO dimerization. The covalence between the binding cation and the O-O dimer determines the degree of electron …


Dynamic Manipulation Of Droplets Using Mechanically Tunable Microtextured Chemical Gradients, Ali J. Mazaltarim, John J. Bowen, Jay M. Taylor, Stephen Morin Jan 2021

Dynamic Manipulation Of Droplets Using Mechanically Tunable Microtextured Chemical Gradients, Ali J. Mazaltarim, John J. Bowen, Jay M. Taylor, Stephen Morin

Department of Chemistry: Faculty Publications

Materials and strategies applicable to the dynamic transport of microdroplets are relevant to surface fluidics, self-cleaning materials, thermal management systems, and analytical devices. Techniques based on electrowetting, topographic micropatterns, and thermal/chemical gradients have advanced considerably, but dynamic microdroplet transport remains a challenge. This manuscript reports the fabrication of mechano-tunable, microtextured chemical gradients on elastomer films and their use in controlled microdroplet transport. Specifically, discreet mechanical deformations of these films enabled dynamic tuning of the microtextures and thus transport along surface-chemical gradients. The interplay between the driving force of the chemical gradient and the microtopography was characterized, facilitating accurate prediction of …


Exponential Random Graphs And A Generalization Of Parking Functions, Ryan Demuse Jan 2021

Exponential Random Graphs And A Generalization Of Parking Functions, Ryan Demuse

Electronic Theses and Dissertations

Random graphs are a powerful tool in the analysis of modern networks. Exponential random graph models provide a framework that allows one to encode desirable subgraph features directly into the probability measure. Using the theory of graph limits pioneered by Borgs et. al. as a foundation, we build upon the work of Chatterjee & Diaconis and Radin & Yin. We add complexity to the previously studied models by considering exponential random graph models with edge-weights coming from a generic distribution satisfying mild assumptions. In particular, we show that a large family of two-parameter, edge-weighted exponential random graphs display a phase …


Recent Advances In Supramolecular Affinity Separations: Affinity Chromatography And Related Methods, Ashley G. Woolfork, Sazia Iftekhar, Susan Ovbude, Kyungah Suh, Sadia Sharmeen, Isaac Kyei, Jacob Jones, David S. Hage Jan 2021

Recent Advances In Supramolecular Affinity Separations: Affinity Chromatography And Related Methods, Ashley G. Woolfork, Sazia Iftekhar, Susan Ovbude, Kyungah Suh, Sadia Sharmeen, Isaac Kyei, Jacob Jones, David S. Hage

David Hage Publications

Contents

1 Introduction

2 Supports for Affinity Chromatography

 2.1 Natural Supports and Related Materials

 2.2 Inorganic Supports

 2.3 Synthetic Supports

 2.4 Magnetic Beads and Particles

 2.5 Smart Materials

 2.6 Nanomaterials

 2.7 Support Formats

3 Immobilization Methods

 3.1 Non-Covalent Immobilization

 3.2 Covalent Immobilization

4 Binding Agents Used in Affinity Chromatography

 4.1 Biological Agents as Affinity Ligands

4.1.1 Immunoaffinity Chromatography

4.1.2 Immunoglobulin-Binding Proteins

4.1.3 Lectins

4.1.4 Enzymes

4.1.5 Serum Proteins

4.1.6 Biotin, Avidin, and Streptavidin

4.1.7 Carbohydrates

4.1.8 Lipids

4.1.9 Nucleic Acids

 4.2 Non-Biological Agents as Affinity Ligands

4.2.1 Boronates and Related Mixed Ligands

4.2.2 Dye-Ligands

4.2.3 Immobilized Metal-Ion Chelates

4.2.4 Molecularly …


Analysis Of Drinking Water Disinfection Options, Bryce Carlen Jan 2021

Analysis Of Drinking Water Disinfection Options, Bryce Carlen

Department of Environmental Studies: Undergraduate Student Theses

This thesis utilizes existing research to provide a framework that can be used for community and disaster planning. It analyses the critical process of water disinfection for drinking water. It focuses on chemical, distillation, and ultraviolet treatments in both centralized and point-of-use treatment. This thesis aims to provide a method for communities to determine the optimal water treatment, utilizing a framework based on weighted criteria. The decision-making framework is an easy-to-use and flexible process that communities can tailor for their specific needs to find the optimal treatment relative to their needs. In this study’s generalized example, ultraviolet treatment and distillation …


Audit Of Waste Collected Over One Week From Superior Dental Health Of Lincoln, Bryclin Alstrom Jan 2021

Audit Of Waste Collected Over One Week From Superior Dental Health Of Lincoln, Bryclin Alstrom

Department of Environmental Studies: Undergraduate Student Theses

A waste audit of Superior Dental Health of Lincoln was conducted in order to propagate the implementation of sustainable waste management practices within the company. Differentiating between hazardous waste and solid waste is necessary for environmentally friendly waste management and ceasing the spread of infectious pathogens. The audit identified nine different materials contributing to the biomedical waste stream of the company. Of which, personal protective equipment (PPE) is of major concern due to the financial commitment necessary to acquire / dispose of these products, as well as the strain in supply due to the current COVID-19 pandemic. The results of …


Long-Term Impacts Of 2019 Flood Experiences On Nebraskans’ Climate Change Perceptions, Caitlin Kingsley Jan 2021

Long-Term Impacts Of 2019 Flood Experiences On Nebraskans’ Climate Change Perceptions, Caitlin Kingsley

Department of Environmental Studies: Undergraduate Student Theses

This study examines climate change perceptions in Nebraskans who experienced or witnessed flooding in March 2019. The purpose is to determine the impacts of 2019 flood experiences on Nebraskans’ climate change perceptions. The objectives are to determine the influence of flood proximity on changes in climate change perceptions, determine whether 2019 flooding had long-term impacts on Nebraskans’ climate change perceptions, and determine the influence of personal background factors on perceptions. A three-phase interview was utilized to collect background information, climate change perceptions, 2019 flood experiences, and relationships between 2019 flood experiences and climate change perceptions. Background information and climate change …


Mental Health Incorporation In Nebraskan Recovery Plans Following The 2019 Midwestern Floods, Isabelle Murray Jan 2021

Mental Health Incorporation In Nebraskan Recovery Plans Following The 2019 Midwestern Floods, Isabelle Murray

Department of Environmental Studies: Undergraduate Student Theses

In March 2019, Nebraska was hit with major floods that caused extensive damage throughout the state. Nebraskans spent the following months recovering from many aspects of the natural disaster. One aspect of emergency response and the act of recovery that is commonly overlooked is the mental health of individuals following the traumatic events. The purpose of this thesis is to evaluate the level of incorporation of mental health care and services in recovery plans following natural disasters. The qualitative analysis of recovery plans focused on Nebraska and the county-level response to the 2019 Midwestern floods. The objectives were to identify …


Mitigation Strategies For Municipal Solid Waste Generation In Lincoln, Justine Mileski Jan 2021

Mitigation Strategies For Municipal Solid Waste Generation In Lincoln, Justine Mileski

Department of Environmental Studies: Undergraduate Student Theses

This study was completed to explore mitigation solutions to Municipal Solid Waste (MWS) in the City of Lincoln. Due to population growth, especially in urban environments, waste generation is an increasingly difficult problem that requires complex solutions. This work is done to explore efficacy of various mitigation strategies such as recycling and composting of waste. This study will be conducted utilizing data found in the City of Lincoln Solid Waste Plan 2040 and applying it to the EPA Policy and Program Impact Estimator. Specifically, withing the EPA Policy and Program Impact Estimator, curbside collection and pay-as-you-throw (PAYT) programming will be …


Regenerative Agriculture’S Potential Carbon Storage In Nebraska Soils, Jenna Mccoy Jan 2021

Regenerative Agriculture’S Potential Carbon Storage In Nebraska Soils, Jenna Mccoy

Department of Environmental Studies: Undergraduate Student Theses

This meta-analysis investigates the possible carbon sequestration of no-till and cover crop practices on Nebraska farmlands. These management practices are part of regenerative agriculture, a farming method designed to mitigate and adapt to climate change. As climate change is expected to significantly reduce yields in Nebraska, sequestering carbon in farmlands offers a way to adapt to climate change impacts and lower the concentration of carbon dioxide in the atmosphere. However, changing management practices is difficult and is driven primarily by economics. This study aims to determine how much carbon these practices can sequester in Nebraska soil each year by evaluating …


Designing A Mobile App And Online Directory To Increase The Visibility Of Environmental Organizations In A Community, Kayla Vondracek Jan 2021

Designing A Mobile App And Online Directory To Increase The Visibility Of Environmental Organizations In A Community, Kayla Vondracek

Department of Environmental Studies: Undergraduate Student Theses

Concern for environmental degradation, natural resource depletion, and public health has long been a necessary part of a strongly developed and sophisticated society. Humans are primarily responsible for the depletion of the natural environment as it supplies the commodities required to ensure the long-term survival of civilizations. As cultures continue to evolve, so does the practice of land stewardship and protection of resources. With the necessary expansion of industry and housing needed to support a rising human population, the management of natural resources, pollution control, and the environment has become increasingly important to people worldwide. Bernstein and Szuster (2019) suggest …


Sparking Awareness In Lincoln Electronic Waste Trends And Habits: A Student Behavioral Analysis, Zowie Vincent Jan 2021

Sparking Awareness In Lincoln Electronic Waste Trends And Habits: A Student Behavioral Analysis, Zowie Vincent

Department of Environmental Studies: Undergraduate Student Theses

Nebraska is recognized as one of the few states that have not established any laws or practices managing electronic waste. Along with no e-waste management laws, there is also a lack of studies discussing the behavioral trends and habits towards electronic devices and how to dispose of them once they are unable to function. Continuing to ignore the choice of recycling electronics results in further damage towards the environment, human and animal health, as well as an economic opportunity of a growing market. This study focuses on the trends and habits of electronic consumption, usage, and disposal amongst students at …


Using The Theory Of Planned Behavior To Understand The Behavioral Use Of Single-Use Plastic Bags By Students At The University Of Nebraska–Lincoln, Josephine Stoessel Jan 2021

Using The Theory Of Planned Behavior To Understand The Behavioral Use Of Single-Use Plastic Bags By Students At The University Of Nebraska–Lincoln, Josephine Stoessel

Department of Environmental Studies: Undergraduate Student Theses

Reduction in the use of single-use plastic bags is a necessary sustainability step as it will reduce pollution of air, soil, waterways, and ingestion by marine animals. The Theory of Planned Behavior is used in this study to determine which components are the influencing factors for why students at the University of Nebraska-Lincoln use single-use plastic bags. An understanding of these factors allows for suggestions and recommendations for actions that can be taken by the university to combat this environmental issue. EcoCoin is an incentive-based program created by Penn State, and is the focus of this study. The literature review …


The Relationship Between Time And Plant Diversity In Prairie Restorations Within The Prairie Corridor On Haines Branch, Elizabeth Park Jan 2021

The Relationship Between Time And Plant Diversity In Prairie Restorations Within The Prairie Corridor On Haines Branch, Elizabeth Park

Department of Environmental Studies: Undergraduate Student Theses

This study focuses on better understanding the relationship between the age of prairie restorations and their plant diversity. The study looks specifically at the prairie restorations within the Prairie Corridor on Haines Branch, located west of Lincoln, Nebraska. The data gathered from these restorations show a positive correlation between age and native plant diversity. This diversity indicates that the restorations are fulfilling their purpose by bringing native prairie plants back to the area. From the data I came to these four conclusions, 1) Because the study only included two restorations greater than 10 years old, it is unclear if the …


The Marine Terraces Of Santa Cruz Island, California: Implications For Glacial Isostatic Adjustment Models Of Last-Interglacial Sea-Level History, Daniel R. Muhs, R. Randall Schumann, Lindsey T. Groves, Kathleen R. Simmons, Christopher R. Florian Jan 2021

The Marine Terraces Of Santa Cruz Island, California: Implications For Glacial Isostatic Adjustment Models Of Last-Interglacial Sea-Level History, Daniel R. Muhs, R. Randall Schumann, Lindsey T. Groves, Kathleen R. Simmons, Christopher R. Florian

United States Geological Survey: Staff Publications

Glacial isostatic adjustment (GIA) models hypothesize that along coastal California, last interglacial (LIG, broadly from ~130 to ~115 ka) sea level could have been as high as +11 m to +13 m, relative to present, substantially higher than the commonly estimated elevation of +6 m. Areas with low uplift rates can test whether such models are valid. Marine terraces on Santa Cruz Island have previously been reported to occur at low (<10 m) elevations, but ages of many such localities are not known. Using lidar imagery as a base, marine terraces on Santa Cruz Island were newly mapped, elevations were measured, fossils were collected for U-series dating (corals), strontium isotope compositions and amino acid geochronology (mollusks), and paleozoogeography (all taxa). Sr isotope compositions of mollusks from the highest of three marine terraces give ages of ~2.5 Ma to 1.9 Ma, along with Pliocene ages, fromshells interpreted to be reworked. U-series ages of corals fromthewestern part of the island indicate that low-elevation terraces north of the Santa Cruz Island fault correlate to the LIG. Where corals are lacking, amino acid ratios and faunal aspects support terrace correlation to the LIG high stand of sea. Elevations of most terrace localities north of the east-west trending Santa Cruz Island fault, in both thewestern and eastern parts of the island, range from5.75mto 8mabove sea level, well belowthe modeled paleo-sealevel range. Subsidence is ruled out as a mechanism for explaining the lower-than-modeled elevations, because higher-elevation terraces are present alongmuch of the Santa Cruz Island coast north of the fault, indicating longterm tectonic uplift. The low elevations of the LIG terrace fragments are, however, consistent with a low rate of uplift derived from the higher, ~2.5–1.9 Ma terrace. A number of other localities on the Pacific Coast, also dated to the LIG, have marine terrace elevations below the modeled level. GIA models may have overestimated last interglacial sea level by a substantial amount and need to be revised if used for forecasts for future sea-level rise.


Records Of Hippoboscidae From Mongolian Birds Of Prey With Checklist, Update, Matthias Jentzsch, Benjamin Meissner, Nayamsuren Batsaikhan, Annegret Stubbe, Michael Stubbe Jan 2021

Records Of Hippoboscidae From Mongolian Birds Of Prey With Checklist, Update, Matthias Jentzsch, Benjamin Meissner, Nayamsuren Batsaikhan, Annegret Stubbe, Michael Stubbe

Erforschung biologischer Ressourcen der Mongolei / Exploration into the Biological Resources of Mongolia, ISSN 0440-1298

The hippoboscid species Ornithophila gestroi has been rediscovered from Mongolia. It is the easternmost of all the known occurrences. Specimens were collected from Amur Falcon Falco amurensis, Saker Falcon Falco cherrug, Lesser Kestrel Falco naumanni, Eurasian Hobby, Falco subbuteo, Common Kestrel Falco tinnunculus Linnaeus, 1758 and Black Kite Milvus migrans in a breeding area located in southern Mongolia. Amur Falcon, Eurasian Hobby and Black Kite were identified as hosts of O. gestroi for the first time.


Quantifying Model Structural Uncertainty Using Airborne Electromagnetic Data, Burke J. Minsley, Nathan Leon Foks, Paul A. Bedrosian Jan 2021

Quantifying Model Structural Uncertainty Using Airborne Electromagnetic Data, Burke J. Minsley, Nathan Leon Foks, Paul A. Bedrosian

United States Geological Survey: Staff Publications

The ability to quantify structural uncertainty in geological models that incorporate geophysical data is affected by two primary sources of uncertainty: geophysical parameter uncertainty and uncertainty in the relationship between geophysical parameters and geological properties of interest. Here, we introduce an open-source, trans-dimensional Bayesian Markov chain Monte Carlo (McMC) algorithm GeoBIPy—Geophysical Bayesian Inference in Python—for robust uncertainty analysis of time-domain or frequency-domain airborne electromagnetic (AEM) data. The McMC algorithm provides a robust assessment of geophysical parameter uncertainty using a trans-dimensional approach that lets the AEM data inform the level of model complexity necessary by allowing the number of model layers …