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A Tem Study Of Fe3+X Co3-XTi2 (X = 0, 1, 2, 3) Intermetallic Alloys, Xingzhong Li, Anandakumar Sarella, B. Balasubramanian, Shah R. Valloppilly

David Sellmyer Publications

A TEM study has been carried out on crystal structures in the rare-earth-free intermetallic alloys, Fe_3+xCo_3-xTi₂ (x = 0, 1, 2, 3). These alloys have been demonstrated to have potentially high magnetic anisotropy. In these alloys, the main intermetallic compound was recently reported as a new hexagonal phase with a space group of P-6 m2. The present study reveals that the main compound belongs to Laves C14 variant surrounded by α-Fe type crystal as secondary phase in the Fe_3+xCo_3-xTi₂ (x = 0, 1, 2, 3) alloys, in agreement with the …

Preface For Millard Beatty, E. Baesu, Roger Fosdick

Department of Mechanical and Materials Engineering: Faculty Publications

Professor Beatty has contributed a wide variety of research papers and book articles on topics in finite elasticity, continuum mechanics and classical mechanics, including some fundamental experimental work. His works are clear and informative and expose a didactic quality. In the following, we briefly touch upon some of the highlights of his research involvement throughout the years.

Level And Pattern Of Overstory Retention Shape The Abundance And Long-Term Dynamics Of Natural And Created Snags, Charles B. Halpern, Allison K. Rossman, Joan C. Hagar

United States Geological Survey: Staff Publications

Standing dead trees, or snags, serve myriad functions in natural forests, but are often scarce in forests managed for timber production. Variable retention (VR), the retention of live and dead trees through harvest, has been adopted globally as a less intensive form of regeneration harvest. In this study, we explore how two key elements of VR systems — level (amount) and spatial pattern of live-tree retention — affect the carryover and post-harvest dynamics of natural and artificially created snags. We present nearly two decades of data from the DEMO Study, a regional-scale experiment in VR harvests of Douglas-fir-dominated forests in …

Bayesian Analysis For The Lomax Model Using Noninformative Priors, Daojiang He, Dongchu Sun, Qing Zhu

Department of Statistics: Faculty Publications

The Lomax distribution is an important member in the distribution family. In this paper, we systematically develop an objective Bayesian analysis of data from a Lomax distribution. Noninformative priors, including probability matching priors, the maximal data information (MDI) prior, Jeffreys prior and reference priors, are derived. The propriety of the posterior under each prior is subsequently validated. It is revealed that the MDI prior and one of the reference priors yield improper posteriors, and the other reference prior is a second-order probability matching prior. A simulation study is conducted to assess the frequentist performance of the proposed Bayesian approach. Finally, …

Math Club, Lily Rippeteau, Sarah Cunningham

Honors Program: Expanded Learning Clubs

No abstract provided.

Hydrogen Isotope Behavior During Rhyolite Glass Hydration Under Hydrothermal Conditions, Michael R. Hudak, Ilya N. Bindeman, James M. Watkins, Jacob B. Lowenstern

United States Geological Survey: Staff Publications

The diffusion of molecular water (H₂O_m) from the environment into volcanic glass can hydrate the glass up to several wt% at low temperature over long timescales. During this process, the water imprints its hydrogen isotope composition (δD_H2O) to the glass (δD_gl) offset by a glass-H₂O fractionation factor (ΔD_gl-H2O = δD_gl – δD_H2O) which is approximately -33‰ at Earth surface temperatures. Glasses hydrate much more rapidly at higher, sub-magmatic temperatures as they interact with H₂O during eruption, transport, and emplacement. To aid in the interpretation …

Phys 927

Department of Physics and Astronomy: Syllabi

No abstract provided.

2022 Academic Program Review

School of Natural Resources: Documents and Reviews

No abstract provided.

Surveying Pollinator Gardens, Isabel Kolb, Kaitlyn Richards, Nolan Rokke

Environmental Engagement in the Community (ENVR 319): Student Projects

Environmental Engagement in the Community projects, fall 2022

Poster titled Surveying Pollinator Gardens with client Lincoln Electric System.

Matt Talbot Kitchen Organization, Samantha Nielsen, Miqaela Davis, Olivia Clancy

Environmental Engagement in the Community (ENVR 319): Student Projects

Environmental Engagement in the Community projects, fall 2022

Poster titled Matt Talbot Kitchen Organization for client Victoria O'Neil.

Nebraska Solid Waste Measurement, Juliana Amato, Alexi Caines, Alex Napolitano

Environmental Engagement in the Community (ENVR 319): Student Projects

Environmental Engagement in the Community projects, fall 2022

Poster titled Nebraska Solid Waste Measurement for client Douglas County (Nebraska) Environmental Services and the Nebraska Recycling Council.

Project Energy Norfolk, Anna Bunik, Megan Swain, Hunter Tesarek

Environmental Engagement in the Community (ENVR 319): Student Projects

Environmental Engagement in the Community projects, fall 2022

Poster titled Project Energy Norfolk with client City of Norfolk, Nebraska (Steven Rames).

Public Transit Ghg Emission Analysis, Ally Barry, Aspen Rittgarn, Grace Schleining, Wyatt Koppold

Environmental Engagement in the Community (ENVR 319): Student Projects

Environmental Engagement in the Community projects, fall 2022

Poster titled Public Transit GHG Emission Analysis created in partnership with the City of Lincoln (Nebraska) Public Health Department, StarTran, and the University of Nebraska-Lincoln Environmental Studies Program.

Nitrates In Nebraska Groundwater, Kjersten Hyberger, Adam Carlson, Grace Kollars, Rachael Herpel

Environmental Engagement in the Community (ENVR 319): Student Projects

Environmental Engagement in the Community projects, fall 2022

Slides of a presentation titled Nitrates in Nebraska Groundwater, created in collaboration with Rachael Herpel of the Daugherty Water for Food Global Institute.

Mate Sampling Behavior Determines The Density Dependence Of Sexual Selection, J. Colton Watts, Eileen A. Hebets, Brigitte Tenhumberg

School of Biological Sciences: Faculty Publications

Theory predicts that the strength of sexual selection (i.e., how well a trait predicts mating or fertilization success) should increase with population density, yet empirical support remains mixed. We explore how this discrepancy might reflect a disconnect between current theory and our understanding of the strategies individuals use to choose mates. We demonstrate that the density dependence of sexual selection predicted by previous theory arises from the assumption that individuals automatically sample more potential mates at higher densities. We provide an updated theoretical framework for the density dependence of sexual selection by (1) developing models that clarify the mechanisms through …

How Search Committees Assess Teaching: Lessons For Ctls, Katharine Phelps Walsh, Laura Ochs Pottmeyer, Deborah Meizlish, Chad Hershock

To Improve the Academy: A Journal of Educational Development

This study updates and expands upon past work on how tenure-track hiring committees evaluate teaching effectiveness to provide centers for teaching and learning (CTLs) current data as they support graduate students and postdocs navigating the academic hiring process. In this study, 166 hiring committee chairs from nine academic disciplines and a variety of institution types (e.g., Baccalaureate, Master’s, and Doctoral) responded to survey questions addressing how they evaluate teaching effectiveness for tenure-track positions. Results indicate that hiring chairs across institution types and disciplines value a candidate’s teaching effectiveness. Hiring committees use a variety of documents to gather information about an …

Centering Black Women Faculty: Magnifying Powerful Voices, Christen Priddie, Dajanae Palmer, Samantha Silberstein, Allison Brckalorenz

To Improve the Academy: A Journal of Educational Development

While much of the quantitative research on Black women faculty has taken a comparative approach to understanding their experiences, this study provides a counternarrative, centering their experiences as faculty. This large-scale, multi-institution glance at Black women faculty helps to give us an overview of these women across the country, looking at who they are, where they are, how they spend their time, and what they value in undergraduate education. This study allows us to strengthen various arguments made in qualitative studies of Black women faculty and amplify their perspectives and experiences. Furthermore, it reaffirms and reinvigorates the need for educational …

Fellow Travelers: Taking Stock Of Faculty Fellows Programs In The Age Of Organizational Development, Susan A. Colby, Laura Cruz, Danielle Cordaro, Clare Cruz

To Improve the Academy: A Journal of Educational Development

Faculty fellows have long served as a staple of centers for teaching and learning (CTLs), but to date little to no evidence has been gathered regarding their broader impact. The current study provides a snapshot of U.S.-based faculty fellows programs today, based on a comprehensive review of CTL websites. We categorize faculty fellows programs across five modalities that reflect decades of evolution and adaptation in the field of educational development. Our findings are intended to provide the foundation for new pathways of research, practice, and inquiry regarding the implementation of CTL fellowship programs.

Bounds On Cohomological Support Varieties, Benjamin Briggs, Eloisa Grifo, Josh Pollitz

Department of Mathematics: Faculty Publications

Over a local ring R, the theory of cohomological support varieties attaches to any bounded complex M of finitely generated R-modules an algebraic variety VR(M) that encodes homological properties of M. We give lower bounds for the dimension of VR(M) in terms of classical invariants of R. In particular, when R is Cohen-Macaulay and not complete intersection we find that there are always varieties that cannot be realized as the cohomological support of any complex. When M has finite projective dimension, we also give an upper bound for dimVR(M) in terms of the dimension of the radical of the homotopy …

Phys 141h: Elementary General Physics I (Honors), Stephen Ducharme

Department of Physics and Astronomy: Syllabi

Syllabus for PHYS 141H: Elementary General Physics (Honors) syllabus for Fall 2022.

Timber Rattlesnake (Crotalus Horridus): A Species Conservation Assessment For The Nebraska Natural Legacy Project, Melissa J. Panella, Dan Fogell, Colleen Rothe-Groleau

Nebraska Game and Parks Commission: Publications

The primary goal in the development of at-risk species conservation assessments is to compile biological and ecological information that may assist conservation practitioners in making decisions regarding the conservation of species of interest. The Nebraska Natural Legacy Project recognizes the timber rattlesnake (Crotalus horridus) as a Tier 1 at-risk species. Provided here are general management recommendations regarding timber rattlesnakes. Conservation practitioners will need to use their professional judgment for management decisions based on objectives, location, and site-specific conditions. Based on the body of literature and available data, this species conservation assessment provides an overview of our current knowledge of timber …

Water Current, Volume 54, No. 2, Fall 2022

Water Current Newsletter

Fall Harvest: Research, News and More from the Nebraska Water Center

Droughtscape, Fall 2022, National Drought Mitigation Center

DroughtScape: Quarterly Newsletter of the National Drought Mitigation Center (2007–2023)

DroughtScape, Fall 2022

Project Energy: South Sioux City, City Hall Emissions Reduction, Alayna Cowan, Michael Smilko, Spencer Rahl

Environmental Engagement in the Community (ENVR 319): Student Projects

Environmental Engagement in the Community projects, fall 2022

Video titled Project Energy: South Sioux City, City Hall Emissions Reduction with client South Sioux City, Iowa; Conservation Nebraska; and ICLEI.

Landscape Change, Scale, And Human Response To Change In The Great Plains, Kate Bird

School of Natural Resources: Dissertations, Theses, and Student Research

Great Plains landscapes are undergoing changes at multiple spatial and temporal scales due to processes ranging from woody encroachment to climate change. These changes may fundamentally alter the agroecosystems of the Great Plains such that the provisioning of ecosystem services including biodiversity and livestock production is affected. Improving our understanding of the effects of landscape change at multiple scales and how humans perceive and respond to these changes is important for facilitating research and management that enhances the resilience of these agroecosystems. As such, I first applied discontinuity theory and graph theory to evaluate the functional connectivity of the Central …

The Freedom Collection 2017–2021: Part 1, The Composition Of The Freedom Collection And Uncl’S Downloads By Member And Subject, David C. Tyler

University of Nebraska-Lincoln Libraries: White Papers

With data provided by a colleague, the author looked at the University of Nebraska Consortium of Libraries (UNCL) downloading activity of Elsevier's Freedom Collection for the 2017-2021 interval. Members include the University of Nebraska at Kearney, University of Nebraska-Lincoln, University of Nebraska Medical Center, and University of Nebraska Omaha.

The author looked at activity by member and by subject at the level of journals' Library of Congress Classifications.

This report was submitted in the fall of 2022 to the UNL Libraries Collections Strategies Committee (CSC) and to the members of the Collections Strategies and Open Scholarship (CSOS) department.

Getting Ahead Of Flash Drought: From Early Warning To Early Action, Jason A. Otkin, Molly Woloszyn, Hailan Wang, Mark D. Svoboda, Marina Skumanich, Roger Pulwarty, Joel Lisonbee, Andrew Hoell, Mike Hobbins, Tonya Haigh, Amanda E. Cravens

National Drought Mitigation Center: Faculty Publications

Flash droughts, characterized by their unusually rapid intensification, have garnered increasing attention within the weather, climate, agriculture, and ecological communities in recent years due to their large environmental and socioeconomic impacts. Because flash droughts intensify quickly, they require different early warning capabilities and management approaches than are typically used for slower-developing “conventional” droughts. In this essay, we describe an integrated research-and-applications agenda that emphasizes the need to reconceptualize our understanding of flash drought within existing drought early warning systems by focusing on opportunities to improve monitoring and prediction. We illustrate the need for engagement among physical scientists, social scientists, operational …

Soils Of The Central Nebraska Loess Hills And Central Loess Plains, Judith Turk, Rebecca Young, Nicolas A. Jelinsky, Amber D. Anderson, Ashlee Dere, Colby J. Moorberg, Rachel K. Owen

Conservation and Survey Division: Faculty and Staff Publications

Understanding soil systems that characterize a region is critical to natural resource management. However, the knowledge gained through intensive study of local soil systems, which takes place annually as part of collegiate soil judging contests, is often poorly preserved for future use. In this study, field descriptions and laboratory data for 16 soil profiles described for the 2019 Region 5 Soil Judging Contest were used to characterize the soil system of the Central Nebraska Loess Hills and Central Loess Plains. Three landscape components of this soil system were analyzed: the loess uplands and rainwater basins, the transitional zone, and bottomlands. …

Icebar: Feedback-Driven Iterative Repair Of Alloy Specifications, Simón Gutiérrez Brida, Germán Regis, Guolong Zheng, Hamid Bagheri, Thanhvu Nguyen, Nazareno Aguirre, Marcelo Frias

School of Computing: Faculty Publications

Automated program repair (APR) techniques have shown great success in automatically finding fixes for programs in programming languages such as C or Java. In this work, we focus on repairing formal specifications, in particular for the Alloy specification language. As opposed to most APR tools, our approach to repair Alloy specifications, named ICEBAR, does not use test-based oracles for patch assessment. Instead, ICEBAR relies on the use of property-based oracles, commonly found in Alloy specifications as predicates and assertions. These property-based oracles define stronger conditions for patch assessment, thus reducing the notorious overfitting issue caused by using test-based oracles, …

The Road Not Taken: Exploring Alias Analysis Based Optimizations Missed By The Compiler, Khushboo Chitre, Piyus Kedia, Rahul Purandare

School of Computing: Faculty Publications

Context-sensitive inter-procedural alias analyses are more precise than intra-procedural alias analyses. However, context-sensitive inter-procedural alias analyses are not scalable. As a consequence, most of the production compilers sacrifice precision for scalability and implement intra-procedural alias analysis. The alias analysis is used by many compiler optimizations, including loop transformations. Due to the imprecision of alias analysis, the program’s performance may suffer, especially in the presence of loops.

Previous work proposed a general approach based on code-versioning with dynamic checks to disambiguate pointers at runtime. However, the overhead of dynamic checks in this approach is 𝑂(𝑙𝑜𝑔 𝑛), which is substantially high to …