Digital Commons Network^™

Nonnegativity Of Exact And Numerical Solutions Of Some Chemotactic Models, Patrick De Leenheer, Jay Gopalakrishnan, Erica Zuhr

Mathematics and Statistics Faculty Publications and Presentations

We investigate nonnegativity of exact and numerical solutions to a generalized Keller–Segel model. This model includes the so-called “minimal” Keller–Segel model, but can cover more general chemistry. We use maximum principles and invariant sets to prove that all components of the solution of the generalized model are nonnegative. We then derive numerical methods, using finite element techniques, for the generalized Keller–Segel model. Adapting the ideas in our proof of nonnegativity of exact solutions to the discrete setting, we are able to show nonnegativity of discrete solutions from the numerical methods under certain standard assumptions. One of the numerical methods is …

A New Theory Of The State Corporate Income Tax: The State Corporate Income Tax As Retail Sales Tax Complement, Darien Shanske

Faculty Scholarship

No abstract provided.

Compositional Diversity In The Atmospheres Of Hot Neptunes, With Application To Gj 436b, J. I. Moses, M. R. Line, Channon Visscher, M. R. Richardson, N. Nettleman, J. J. Fortney, T. S. Barman, K. B. Stevenson, N. Madhusudhan

Faculty Work Comprehensive List

Neptune-sized extrasolar planets that orbit relatively close to their host stars—often called "hot Neptunes"—are common within the known population of exoplanets and planetary candidates. Similar to our own Uranus and Neptune, inefficient accretion of nebular gas is expected produce hot Neptunes whose masses are dominated by elements heavier than hydrogen and helium. At high atmospheric metallicities of 10-10,000 times solar, hot Neptunes will exhibit an interesting continuum of atmospheric compositions, ranging from more Neptune-like, H₂-dominated atmospheres to more Venus-like, CO₂-dominated atmospheres. We explore the predicted equilibrium and disequilibrium chemistry of generic hot Neptunes and find that …

Chemistry Of Impact-Generated Silicate Melt-Vapor Debris Disks, Channon Visscher, Bruce Fegley Jr.

Faculty Work Comprehensive List

In the giant impact theory for lunar origin, the Moon forms from material ejected by the impact into an Earth-orbiting disk. Here we report the initial results from a silicate melt-vapor equilibrium chemistry model for such impact-generated planetary debris disks. In order to simulate the chemical behavior of a two-phase (melt+vapor) disk, we calculate the temperature-dependent pressure and chemical composition of vapor in equilibrium with molten silicate from 2000 to 4000 K. We consider the elements O, Na, K, Fe, Si, Mg, Ca, Al, Ti, and Zn for a range of bulk silicate compositions (Earth, Moon, Mars, eucrite parent body, …

Effects Of Hypertension And Diabetes On Sentence Comprehension In Aging, Dalia Cahana-Amitay, Martin Albert, Emmanuel Ojo, Jesse Sayers, Mira Goral, Loraine Obler, Avron Spiro Iii

Publications and Research

Objectives. To assess the impact of hypertension and diabetes mellitus on sentence comprehension in older adults.

Method. Two hundred and ninety-five adults aged 55 to 84 (52% men) participated in this study. Self-report mail survey combined with medical evaluations were used to determine eligibility. Multiple sources were used to determine whether hypertension and diabetes were present or absent and controlled or uncontrolled. Sentence comprehension was evaluated with two tasks: embedded sentences (ES) and sentences with multiple negatives (MN). Outcome measures were percent accuracy and mean reaction time of correct responses on each task.

Results. Regression models adjusted for age, gender, …

Hemispheric Processing Of Vocal Emblem Sounds, Yael Neumann-Werth, Erika Levy, Loraine Obler

Publications and Research

Vocal emblems, such as shh and brr, are speech sounds that have linguistic and nonlinguistic features; thus, it is unclear how they are processed in the brain. Five adult dextral individuals with left-brain damage and moderate– severe Wernicke’s aphasia, five adult dextral individuals with right-brain damage, and five Controls participated in two tasks: (1) matching vocal emblems to photographs (‘picture task’) and (2) matching vocal emblems to verbal translations (‘phrase task’). Cross-group statistical analyses on items on which the Controls performed at ceiling revealed lower accuracy by the group with left-brain damage (than by Controls) on both tasks, and …

Comment On "Density And Physical Current Density Functional Theory", Xiao-Yin Pan, Viraht Sahni

Publications and Research

In this letter to the editor, the authors comment on an earlier article they had published, "Density and Physical Current Density Functional Theory" (Pan, X.-Y. and Sahni, V. (2010), Density and physical current density functional theory. Int. J. Quantum Chem., 110: 2833–2843. doi: 10.1002/qua.22862).

Claiming Space, Redefining Politics: Urban Protest And Grassroots Power In Bolivia, Carwil Bjork-James

Dissertations, Theses, and Capstone Projects

This dissertation analyzes the role of space-claiming protests by primarily left grassroots social movements in Bolivia's current political transformation. Space claiming includes mass protests that physically control or symbolically claim urban space through occupations of plazas and roads, sit-ins, blockades, and other measures. As a theoretical construct, space claiming brings together tactics of collective action and meanings of public spaces, and looks at the consequences of their interaction. This dissertation is based on ethnographic engagement and oral interviews with protest participants and their state interlocutors during twelve months of fieldwork and archival research. By using detailed ethnographic evidence--of social life …

Diversity, Resource Partitioning, And Species Turnover In Neotropical Saproxylic Beetles (Coleoptera: Cerambycidae, Curculionidae) Associated With Trees In The Brazil Nut Family (Lecythidaceae), Joyce Lynn Fassbender

Dissertations, Theses, and Capstone Projects

Deforestation and global changes in temperature and moisture associated with rising levels of greenhouse gases are expected to have strong, direct effects on abundance of wood-boring beetles through loss of larval feeding substrates, and indirect effects through climate and microclimate change. This dissertation examines Neotropical saproxylic beetle (Coleoptera: Curculionidae) diversity, niche breadth, and resource partitioning, and predicts possible impacts of climate change. Data from beetle rearing experiments conducted in French Guiana and Peru were analyzed to assess species richness, abundance, host specificity, seasonality and stratification of wood-boring beetles associated with the Brazil nut family (Lecythidaceae). Niche stability was assessed over …

Medicinal Plants Of Northern Thailand For The Treatment Of Cognitive Impairment In The Elderly, Lisa C. Offringa

Dissertations, Theses, and Capstone Projects

Dementia is a progressive neurological disease affecting memory and behavior. The diagnosis of dementia is increasing exponentially worldwide and with it the potential risk for a severe social and economic burden of caring for an increasing debilitated elderly population. Cognitive impairment, and especially memory loss, can be the first indication of dementia. This study documents the treatment of cognitive impairment in the elderly by Thai traditional healers in northern Thailand usingmedicinal plants. Interviews were conducted from 2008-2012 to investigate the etiology of dementia in Thai Traditional Medicine and identify plants used to treat memory loss in the pharmacopeia of northern …

Two Sides To A Drum: Duality In Trinidad Orisha Music And Culture, Ryan J. Bazinet

Dissertations, Theses, and Capstone Projects

This dissertation presents an ethnographic and historical study of music and culture in the Yoruba-derived Trinidad Orisha religion in Trinidad and New York City. Its objectives are: (1) to provide description and documentation of Trinidad Orisha music, an understudied music genre in the African diaspora; (2) to shed light on the historical, cultural, and demographic factors contributing to the development of Trinidad Orisha music by its practitioners; and (3) to provide substance for meaningful comparisons between Trinidad Orisha music and other Yoruba-derived musics.

Based on four years of fieldwork (2008-2012) in Trinidad and in Brooklyn, NY, the study explores Trinidad …

Understanding A Pest: Phylogeography And Systematics Of The Plum Curculio (Conotrachelus Nenuphar), Samuel N. Crane

Dissertations, Theses, and Capstone Projects

The plum curculio (Conotrachelus nenuphar Herbst) (Coleoptera: Curculionidae) is an economically and ecologically important pest in North America but is understudied despite having a long history in the scientific literature. Its chemical ecology, life history habits, and distribution are all well characterized. However, there is a dearth of knowledge concerning the population structure and evolutionary history of the species. This study aims to use methods from evolutionary biology to better understand an agricultural pest species and provide tools to aid in its management.

Existing taxonomic classifications of North American Conotrachelus species have been tested for the first time. Using …

Some Kind Of Monstrosity: What Youth Ministry Can Learn From Heavy Metal, Jason Lief

Faculty Work Comprehensive List

This article brings Slovoj Zizek’s articulation of Pauline Christianity into conversation with Norwegian Black Metal (Gorgoroth) in order to demonstrate the subversive role of popular culture as it challenges the panoptic ideological power of the status quo. Through dialogue with elements of popular culture, like Black Metal, youth ministry is reminded of its prophetic function to challenge the powers of this age as it proclaims the monstrosity of the crucified and resurrected Christ.

Play, Collaborate, Break, Build, Share: 'Screwing Around' In Digital Pedagogy, Katherine D. Harris

Faculty Research, Scholarly, and Creative Activity

Digital Humanities has become a “hot” topic in academia over the last few years (as of 2012), primarily in research and scholarship. While many push forward into new realms of using technology to articulate cool findings, others at non research intensive universities are moving forward with engaging their undergraduate students in var ious forms of Digital Pedagogy, a facet of Digital Humanities. Single day bloom and fade projects, individual assignments, and larger scaffolded projects all comprise Digital Humanities curriculum. Here, I provide examples of all three types of projects an d include a discussion about risk, play, and productive failure …

An Analysis Of The Effect Of A 21st-Century-Designed Middle School On Student Achievement, Gary David Schwartz

Dissertations and Theses @ UNI

Considering the billions of dollars invested in school buildings and the accountability for improving student achievement, there has been the lingering question about how the physical learning environment impacts student achievement. This study explored the impact of a new 21st-century-designed middle school facility on student academic achievement in mathematics and science. This case study used a mixed methods approach to examine the student achievement of 158 middle school students and the perceptions from 13 teachers and two administrators about the impact of the new facility on teaching and student learning. The purpose of this study was to analyze the effect …

Analysis Of Wind Power Generation With Application Of Wind Tunnel Attachment, Ulan Dakeev

Dissertations and Theses @ UNI

This study presents an empirical method for developing a new approach in which a wind tunnel apparatus is used to improve the efficiency of power output by a small-scale wind turbine. A custom-designed wind tunnel attachment was constructed to record, analyze, and interpret both incoming and outgoing wind velocity readings. Moreover, the dissertation project addresses a significant issue concerning the power generation of an experimental wind turbine while the wind tunnel is attached. Wind power characteristics that indicate power output versus wind velocity were obtained by performing a number of case studies. The case studies included normal operation of the …

A Midwestern Culture Of Civility: Student Activism At The University Of Northern Iowa During The Maucker Years (1967-1970), Christopher J. Shackelford

Dissertations and Theses @ UNI

This project examines the changing social dynamic of those affiliated with the University of Northern Iowa during the latter half of the 1960s, with special emphasis on student activism and the changing attitudes of administrators and community members. This project intends to use the medium of alternative newspapers as a central component in the analysis of the time studied and as an unfiltered voice of student dissent. By narrowing the focus of this project to an individual university and community, an intimate narrative emerges that acts as a testament of the overwhelming atmosphere of change that engulfed American colleges throughout …

Writing Supports For Older Students With Significant Disabilities: Examining Two Students' Journeys Towards Becoming Writers, Emily Helen Freeman

Dissertations and Theses @ UNI

This study describes the changes in linguistic and social communicative competencies that occurred when two older students with significant disabilities where provided with writing opportunities, instruction, and supports over a semester of the academic year. The goals of the study were to identify themes and patterns in the skills associated with linguistic and social communicative competence as evidenced in writing over time. A second aim of this study was to identify instruction methods and assistive technology supports being used in the classroom and describes the themes and patterns that emerged in the students’ writing given the presence of these curriculum …

Understanding The Critical Role Of A Wetland In Maintaining The Ecosystem: A Case Study, Sushil Tuladhar

Dissertations and Theses @ UNI

Beaver Valley Wetland in north-east Iowa was studied to determine its functionality in filtering incoming contaminants from the surrounding agricultural fields. The study was conducted from May through November of 2011. Altogether 78 water samples (from 13 sites), 84 soil samples (from 14 sites), and some sediment samples were collected for chemical analysis. Heavy metals in three different soil categories, such as surface, 6” deep, and sediments were found to be at or below the acceptable concentrations, indicating no immediate concern for metal toxicity in the wetland environment. The chemical tracers that were used to study the sub-surface flow regime …

Recalcitrant Arguments, Kiranjeet Kaur Dhillon

Dissertations and Theses @ UNI

On January 26, 2011, Reuters photojournalist Amr Abdallah Dalsh took an image of a unknown veiled woman gesturing at Dalsh and his camera. Using TinEye, a reverse image search engine, I found that 86 circulations and 22 recirculations of the photo were primarily in the United States. US graphic artist Nick Bygon created one of the recirculations, which primarily appeared on US blogs. The photo achieved this level of circulation in the US because it is consistent with, and therefore legible within the symbolic language, of the liberal democratic order. Similar to “Migrant Mother” and “Tank Man”, the photo is …

Mental Illness And Schools: An Examination Of How Schools Are Providing Supports And Services To Students With Mental Health Concerns, Nikki Leigh King

Dissertations and Theses @ UNI

This purpose of this study was to explore the educational experiences of an individual entitled to services through the labels of an intellectual disability and a mental health concern. The study employed qualitative methodologies and methods, through the use of a life/oral history, which allowed the researcher to interview the participant to gain a deeper understanding of the school experiences pertaining to a student with a mental health concern. The study concluded that authentic and individualized supports and services are needed as well as promoting meaningful relationships. Study considerations and future studies are discussed at the end.

Investigating Blended Learning In The High School Science Classroom, Holly Cassandra Hinkhouse

Dissertations and Theses @ UNI

Blended learning combines the best practices of online learning with face-to-face learning and some research has shown it to have positive benefits for students at the postsecondary level. However, few studies have reported the use of blended learning in the high school setting. This study used quantitative methods to measure student attitudes and learning of science content in both a treatment and control group consisting of 9th grade Physical Science classes. Students in the treatment group experienced one semester of blended learning by using online science modules to supplement their in-class learning while the control group continued to have only …

From Sidebets To Sideshow: The Influence Of Gambling On The Development Of Professional Wrestling In America, 1870-1911, Lee Casebolt

Dissertations and Theses @ UNI

While boxing and baseball have been common subjects of historical study, other sports of the nineteenth century have been comparatively neglected by historians. Professional wrestling, in particular, has received very little attention as a sport, as opposed to its twentieth century “sports entertainment” incarnation. What attention it has received has most commonly been through the lens of social history, focusing on wrestling as theater or its psychosexual overtones. Missing from its history is any consideration of the economic factors which influence the evolution of any professional endeavor. This paper explores the relationship between a wrestler’s payment and performance. Specifically, it …

Effect Of Limb Circumference On Intramuscular Cooling During And Following An Ice Bag Application After Exercise, Marcus A. Sojka

Dissertations and Theses @ UNI

Context: Ice bags are commonly applied following exercise, but the effect of limb size on cooling duration and rewarming has not been documented. Objective: Investigate the effect of limb circumference on cooling duration to 10°C below resting baseline and examine the subsequent rewarming trends. Design: Two separate designs were used: a 1 X 2 cross-over design on limb circumference (large circumference [LC: 58-63.5cm] and small circumference [SC: 50-54cm]) and duration of treatment (time to 10°C below baseline) and a 2 X 7 cross-over design on the two limb circumference groups (LC and SC) and the rewarming trend at time Imd, …

School Wide Positive Behavioral And Intervention Supports : The Effectiveness Of Tier 1 Strategies, Gregory James Halsor

Dissertations and Theses @ UNI

This literature review critically examines the effectiveness of Tier 1 Positive Behavioral and Intervention Supports (SWPBIS). Managing problem behavior in the school setting has been a major focus of educators, with the goal of lowering classroom disruptions and increasing the effectiveness of learning.

Over the years, school wide behavior management programs have not been consistent or widespread leading educators to identify disruptive behavior as a primary concern in their classrooms. SWPBIS emphasizes the integration of measurable outcomes, data-based decision making, and evidence based interventions. Research on the implementation of SWPBIS in schools has displayed positive effects related to decreasing the …

Comparing Second Grade Students' Creative And Content Knowledge Performance On Figural Transformation Activities Introduced In A Standard Or Enhanced Manner With Nutrition Content Knowledge Taught Through Factual Or Fantasy Reading, Angela Naomi Webb

Dissertations and Theses @ UNI

Creativity and problem solving are skills students need for success in the 21st century. With the increasing pressures of achieving higher student scores in emphasized content areas, teachers' instruction in science, social studies, music and art has been reduced to provide additional time for teaching reading and mathematics.These lost instructional areas often allowed students to express themselves creatively. Therefore, educators need to find a way to incorporate creativity into content areas like reading and mathematics.

This 16 week repeated measures study examined second grade students' academic and creative performance on figural transformation drawings during an extended reading-science-creativity integrated unit. A …

Comparing Sixth Grade Students' Creativity In Word Play To Spatial Construction With Integrated Academic Content Eliciting A Distal Or Proximal Perspective, Ksenia S. Zhbanova

Dissertations and Theses @ UNI

Pressing global problems require solutions from innovative ideas that depend upon educating a new generation to think creatively. The current study aimed at assisting 24 sixth grade students in a summer program develop their creativity skills in two different areas while integrating academic content. Student performance was examined for transfer of skills across domains and for support of Construal Level Theory, which holds that addressing topics distant in space, time, probability or experience leads to abstract thought supporting greater creativity.

The study was a counterbalanced, repeated measures, two-experimental condition study with students divided into two groups of 12 each. In …