Open Access. Powered by Scholars. Published by Universities.®

Digital Commons Network

Open Access. Powered by Scholars. Published by Universities.®

PDF

Iowa State University

Graduate Theses and Dissertations

Discipline
Keyword
Publication Year

Articles 1 - 30 of 8086

Full-Text Articles in Entire DC Network

Emotional Intelligence Competencies For Success In Early Hospitality Careers, Erich Steinbock Jan 2020

Emotional Intelligence Competencies For Success In Early Hospitality Careers, Erich Steinbock

Graduate Theses and Dissertations

ABSTRACT

The purpose of this study was to define specific emotional intelligence competencies that relate to career success during early hospitality career stages. Convenience sampling with 662 online surveys resulted in 383 valid responses from participants who worked in three different supervisory positions at seven hotels in the USA and Caribbean islands. The data were collected using a web-based survey tool that measured the levels of eight emotional intelligence competencies as independent variables and four success factors as the dependent variables. Descriptive statistics, one-way between-subjects ANOVAs, t-tests, and multiple regressions with moderating variables defined the resulting models.

The findings of ...


The Behavioral And Neurophysiological Effects Of Music Training On Cognitive And Motor Inhibition In Aging Adults, Patricia Izbicki Jan 2020

The Behavioral And Neurophysiological Effects Of Music Training On Cognitive And Motor Inhibition In Aging Adults, Patricia Izbicki

Graduate Theses and Dissertations

Older adults experience a decline in inhibitory control, specifically cognitive and motor inhibition. These declines have been associated with poorer performance in instrumental activities of daily living. However, studies have revealed that older musicians have behavioral and neurophysiological enhancements in various cognitive and motor domains as compared to non-musicians. This suggests that music training may delay the decline in cognitive and motor inhibition with aging. Yet, cognitive and motor inhibition has not been studied across the lifespan in musicians and non-musicians. Thus, the aim of this study was to investigate the behavioral and neurophysiological differences in cognitive and motor inhibition ...


Effect Of Gender Difference And Survey Design In A Tool Usability Testing, Yijia Sun Jan 2020

Effect Of Gender Difference And Survey Design In A Tool Usability Testing, Yijia Sun

Graduate Theses and Dissertations

Good user satisfaction facilitates a company to confirm its value and also is the key to secure customer loyalty and achieve the goal of competitive advantage. User satisfaction can be measured by many market research techniques. A common approach nowadays is usability testing. In the process of the measurement of user satisfaction, we believe the impact of gender difference cannot be ignored. Because of the physical and psychological differences between men and women, their perceptions of things are also affected. Thus, taking this effect into account during the usability testing process may be helpful in the evaluation of a product ...


Comparison Of Baroreceptor Sensitivity With Other Psychophysiological Measures To Classify Mental Workload, Amanda Anderson Jan 2020

Comparison Of Baroreceptor Sensitivity With Other Psychophysiological Measures To Classify Mental Workload, Amanda Anderson

Graduate Theses and Dissertations

Adaptive systems using psychophysiological measures to assess and predict operator states are increasingly prevalent. Yet, the search for a more sensitive and accurate measure is a high priority. The current research investigated the responsiveness of baroreceptor sensitivity (BRS) to varying levels of a mental task (i.e., 1-back, 2-back, and 3-back) compared with other physiological variables (electroencephalogram (i.e., alpha power), electrodermal activity (EDA) (i.e., skin conductance level (SCL)) and to examine BRS's ability to predict performance and workload. Healthy males (n = 26) and females (n = 29) aged 18 to 30 years participated in the study. BRS during ...


Understanding Intuitive Gestures In Wearable Mixed Reality Environments, Karen Marie Doty Jan 2020

Understanding Intuitive Gestures In Wearable Mixed Reality Environments, Karen Marie Doty

Graduate Theses and Dissertations

Augmented and mixed reality experiences are increasingly accessible due to advances in technology in both professional and daily settings. Technology continues to evolve into multiple different forms, including tablet experiences in the form of augmented reality (AR) and mixed reality (MR) using wearable heads-up displays (HUDs). Currently, standards for best usability practices continue to evolve for MR HUD two-dimensional user interfaces (2D UI) and three-dimensional user interfaces (3D UI). Therefore, research on evolving usability practices will serve as guidance for future development of MR HUD applications.

The objective of this dissertation is to understand what gestures users intuitively make to ...


Macroevolution Of Microhabitat, Climate, And Morphology In Lungless Salamanders (Family: Plethodontidae)., Erica Karin Baken Jan 2020

Macroevolution Of Microhabitat, Climate, And Morphology In Lungless Salamanders (Family: Plethodontidae)., Erica Karin Baken

Graduate Theses and Dissertations

Biologists have long sought to understand how ecological selective pressures drive evolutionary responses. Defining how morphology, life history, and abiotic conditions interact across deep time can reveal the selective pressures responsible for shaping various axes of biodiversity. I used this three-pronged framework to investigate the macroevolution of the family of lungless salamanders (Plethodontidae), well-known for its impressive ecological and geographic diversity while exhibiting little apparent morphological diversity. Employing ancestral state estimation methods, geometric morphometrics, and various phylogenetic comparative approaches, I first investigated the macroevolutionary responses of functional morphology to microhabitat-use across the clade's history. From these analyses, I estimated ...


Using Modern And Paleoceanographic Isotopic Systems To Reconstruct Late Holocene Temporal Oceanographic Variability In The Rapidly Warming Gulf Of Maine, Nina Millicent Whitney Jan 2020

Using Modern And Paleoceanographic Isotopic Systems To Reconstruct Late Holocene Temporal Oceanographic Variability In The Rapidly Warming Gulf Of Maine, Nina Millicent Whitney

Graduate Theses and Dissertations

The Gulf of Maine, a semi-enclosed sea on the east coast of North America, has been warming faster than most of the rest of the world's oceans over the last three decades. Since the installment of the Boothbay Harbor (Maine) sea surface temperature (SST) record in 1905, surface waters have warmed by more than 2°C, with more rapid warming seen recently. However, it is unclear when this pronounced warming in the Gulf of Maine began or whether the warming in recent decades is the result of natural variability, anthropogenic causes, or a combination of both. Such considerations are ...


Hydrogeology And Groundwater Geochemistry Of Two Glacigenic Aquitard/Aquifer Systems In North-Central And South-Central Minnesota, Anna-Turi Maher Jan 2020

Hydrogeology And Groundwater Geochemistry Of Two Glacigenic Aquitard/Aquifer Systems In North-Central And South-Central Minnesota, Anna-Turi Maher

Graduate Theses and Dissertations

Buried glacial aquifers in Minnesota contribute drinking water to many communities throughout the state. Vertical leakage through overlying till aquitards is largely unknown, causing uncertainty in predicting aquifer sustainability. As part of a study of confined aquifer sustainability, the U.S. Geological Survey, Iowa State University, and Minnesota agencies have investigated vertical leakage through till aquitards deposited by glacial advances in Minnesota. Although estimating leakage involves assessment of aquitard hydraulic properties, previous studies show that groundwater geochemistry data in till aquitards can corroborate estimated vertical travel times.

In Phase II (2017-2019) of the study, a rotary-sonic rig was used to ...


Chelation-Based Enhancement Of Novel And Commercially Available Antimicrobials Against Foodborne Pathogens, Allison Brost Jan 2020

Chelation-Based Enhancement Of Novel And Commercially Available Antimicrobials Against Foodborne Pathogens, Allison Brost

Graduate Theses and Dissertations

Metal-sequestering compounds (chelators), such as the chemical compounds Ethylenediaminetetraacetic acid (EDTA) and long-chain polyphosphates, can enhance the uptake and activity of various antimicrobial compounds. Previous work has shown that chelation of structurally important divalent cations (Mg2+, Ca2+) from the outer membrane of Gram-negative bacteria is an effective route towards the permeabilization of these bacteria, leading to uptake or modulation of activity for co-applied antimicrobials, including membrane-active antimicrobials such as quaternary ammonium compounds. Similar antimicrobial-enhancing results have been shown for Gram-positive bacteria and fungi, presumably due to the chelation of analogous structurally-important cations. We hypothesize that, like EDTA and polyphosphates, naturally ...


The Assessment Of Selenium Bioaccessibility And Bioavailability From Selenium-Rich Algae, Laura Ann Walter Jan 2020

The Assessment Of Selenium Bioaccessibility And Bioavailability From Selenium-Rich Algae, Laura Ann Walter

Graduate Theses and Dissertations

Selenium (Se) is an essential trace mineral known for its role as an antioxidant in oxidation-reduction reactions. Due to deficiency in many parts of the world, development of new Se supplementation is increasing in popularity. The objective of this study was to examine the bioaccessiblity (BAC) and bioavailability (BA) from Se-rich algae using an in vitro digestion/Caco-2 cell model. Algal samples were grown in Se-rich media with varying concentrations of either selenite or selenate, then subjected to in vitro digestion. The centrifuged supernatent was applied on the Caco-2 cell monolayer for a 24-h treatment. BAC was tested based on ...


Increased Biosecurity In Feed Manufacturing Through Effective Hydrothermal Treatment And Recontamination Prevention During Drying, Cooling And Handling, Michelle Ann Friedmann Jan 2020

Increased Biosecurity In Feed Manufacturing Through Effective Hydrothermal Treatment And Recontamination Prevention During Drying, Cooling And Handling, Michelle Ann Friedmann

Graduate Theses and Dissertations

The importance of biosecurity is ever increasing within the animal feed industry. Salmonella is a major microbial hazard that can persist within animal feed and cause human illness. The risk of Salmonella contamination can be reduced by killing pathogens through heat treatment as a function of processing temperature and time. A retentioner is a device used to extend the time that animal feed is exposed to desired treatment temperature resulting from steam conditioning. The overall objective of this research was to improve biosecurity practices in feed manufacturing by ensuring effective steam conditioning and retentioning treatment, and preventing recontamination during the ...


Demonstration Of The Value Of A Graphics-Based Decision Support System For Order Picking Warehouse Design, Steven Kryk Jan 2020

Demonstration Of The Value Of A Graphics-Based Decision Support System For Order Picking Warehouse Design, Steven Kryk

Graduate Theses and Dissertations

All warehouses have a layout design. A company can reduce operational costs in their warehouse by up to 75% with a layout design that allows for products on a pick list to get picked quicker. Evaluating which layout design would best reduce picking times and communicating the results of that evaluation continue to stump workforces.

Manual techniques fail to quickly test layout designs en masse or offer inaccurate heuristics. Automated techniques often increase the accuracy but are either esoteric or have simulation run-times which rival the durations of a manual technique.

A fast and accurate automated technique that is both ...


Farmer And Farm Characteristics Associated With Interest In Prairie Strips In Iowa, Grace Yi Jan 2020

Farmer And Farm Characteristics Associated With Interest In Prairie Strips In Iowa, Grace Yi

Graduate Theses and Dissertations

Prairie strips provides a wide range of soil and water quality benefits as well as habitats for wildlife. At just $28 to $39 per treated acre per year, coupled with eligibility to collect federal conservation payments, prairie strips are one of the most cost-effective best management practices (BMPs) available to Iowa farmers. Despite the ecological benefits and economic advantages, there are less than 70 collaborators who have adopted prairie strips in Iowa. Furthermore, as a relatively new conservation practice, there is a lack of research examining what factors encourage or deter Iowa farmers from adopting prairie strips. Therefore, using the ...


Understanding Site Location Factors Of Food Pantries And Free Meal Programs In The Des Moines, Ia Metro, Jacob Howe Jan 2020

Understanding Site Location Factors Of Food Pantries And Free Meal Programs In The Des Moines, Ia Metro, Jacob Howe

Graduate Theses and Dissertations

Food pantries and free meal programs provide a critical service to low-income individuals and families living in the Des Moines MPA given the high rates of poverty and food insecurity. The geographic proximity of food assistance programs for low-income individuals and families provides a valuable indicator for understanding the potential success of these services given their limited means and options for transportation. First, this research sought to develop an organizational profile for each organization in an attempt to understand organizational influences on the location selection processes and criteria in practice. Second, this research sought to evaluate the potential geographic accessibility ...


Student Achievement In Inclusive Science Classrooms, Gabrielle Kathleen Smithman Jan 2020

Student Achievement In Inclusive Science Classrooms, Gabrielle Kathleen Smithman

Graduate Theses and Dissertations

The purpose of this study was to gather and analyze data on the academic achievement of students in inclusive seventh grade science classrooms, focusing on comparative data between typically achieving students and students with disabilities (SWD). It sought to answer the question, "are SWD achieving at an equivalent rate in science when compared to their typically achieving peers?" Secondary data on grades was collected and analyzed. The study found that typically achieving students were significantly more likely to meet achievement standards than SWD. However, the data also revealed an issue with disproportionality within special education and revealed significant differences in ...


Certified Crop Advisers' Intention To Use Smartphones For Mobile Learning, Thomas L. Schultz Jan 2020

Certified Crop Advisers' Intention To Use Smartphones For Mobile Learning, Thomas L. Schultz

Graduate Theses and Dissertations

This dissertation examined Certified Crop Advisers' (CCAs) perceptions of using smartphones for mobile learning (m-learning) as well as how they currently use smartphones which is beneficial for agriculture education providers. In this study, 630 CCAs from the United States participated by responding to a 39-question online survey based on the Unified Theory of Acceptance and Use of Technology (UTAUT). This survey gathered data concerning perceptions about m-learning on a smartphone and CCA demographics. Analysis included descriptive statistics, non-parametric tests, and multiple regression. First, descriptive analysis and non-parametric tests were used to compare groups within the CCA population. Almost all CCAs ...


Exploring Validation And Expectations Among Community College Transfer Students, Kristin Towers Jan 2020

Exploring Validation And Expectations Among Community College Transfer Students, Kristin Towers

Graduate Theses and Dissertations

Given the growing number of students choosing to pursue higher education through the community college pipeline, considerable research has been directed towards examining the experiences of community college transfer students. Such research often places focus on comparing academic outcomes between transfer students and non-transfer students and examining background factors and challenges associated with transfer student adjustment in relationship to persistence to graduation. Taking such an approach results in a limited view of transfer students, operating from a deficit-centered approach, and fails to adequately investigate outcomes for community college transfer students beyond graduation.

Guided by Rendon's (1994) validation theory, this ...


Professional Learning Communities On Phenomenon-Based Science Pedagogy: Contrastive Cases Of Urban Elementary Teachers, Stephanie Marie Schneider Jan 2020

Professional Learning Communities On Phenomenon-Based Science Pedagogy: Contrastive Cases Of Urban Elementary Teachers, Stephanie Marie Schneider

Graduate Theses and Dissertations

A majority of educators are ill-prepared to teach culturally relevant and reform-based science, especially in socioeconomically-stressed, diverse urban settings. Inadequate teacher quality has contributed to an annual inequality for historically-excluded students that has accumulated to create a long-term disparity. The purpose of this qualitative, comparative case study was to address these inequities by creating a science professional development intervention for elementary educators teaching at two socioeconomically-stressed, highly diverse urban schools. My aim was to positively influence their science teaching identities in order to improve students' learning experiences. Seventeen teachers participated in the year-long professional learning community and focused on a ...


Exploring The Organizational Emergence Of Academic Leadership Programs, Katherine L. Friesen Jan 2020

Exploring The Organizational Emergence Of Academic Leadership Programs, Katherine L. Friesen

Graduate Theses and Dissertations

The number of academic leadership programs that have emerged across institutions of higher education in the United States has grown. In doing so, programs have emerged within college and universities in disparate locations, not reflective of more rigid disciplinary norms and practices. This dissertation sought to explore the emergence of academic leadership programs through the study of two academic leadership programs with undergraduate degrees in research intensive universities, situated differently within their institutions.

The findings empirically establish academic leadership programs as organizations whose emergence was influenced by the institutionalized hierarchy of disciplines and structures of higher education. Programs with degrees ...


Exploring The Personal, Career, And Academic Growth Of Learning Community Peer Mentors In The College Of Agriculture And Life Sciences At Iowa State University, Sarah Ellen Orban Jan 2020

Exploring The Personal, Career, And Academic Growth Of Learning Community Peer Mentors In The College Of Agriculture And Life Sciences At Iowa State University, Sarah Ellen Orban

Graduate Theses and Dissertations

The purpose of this thesis research was to explore the personal, career, and academic growth of peer mentors within the College of Agriculture and Life Science (CALS) learning communities at Iowa State University (ISU). This study encompassed four objectives: (1) describe demographic traits of CALS peer mentors; (2) identify how mentors' personal growth is affected by their experiences as a peer mentor; (3) detect mentor career development and growth affected by experience as a peer mentor; and (4) determine academic growth and development affected from experiences as a peer mentor.

For objectives one through four, a census survey was sent ...


Assessing The Relevance Of Iowa State University's Ag 450 Farm Management And Operation Course Content Based On Industry, Alumni, And Student Perspectives, Skyler Perry Rinker Jan 2020

Assessing The Relevance Of Iowa State University's Ag 450 Farm Management And Operation Course Content Based On Industry, Alumni, And Student Perspectives, Skyler Perry Rinker

Graduate Theses and Dissertations

The purpose of this dissertation was to assess the relevance of Iowa State University's Agricultural Education and Studies 450 capstone course based on industry, alumni, and students' perspectives. This dissertation utilized quantitative and qualitative approaches to address the following three research objectives: (1) identify the professional and technical skills agricultural industry employers expect agricultural graduates to possess upon employment or entering the workforce, (2) describe alumni perspectives regarding the skills learned in an agricultural capstone course, and how those skills have been transferred or utilized in the agricultural workforce, and (3) describe students' agricultural experiences before and during the ...


Discovery And Translation Of Genetic Resistance To Soybean Cyst Nematode, Haley Trumpy Jan 2020

Discovery And Translation Of Genetic Resistance To Soybean Cyst Nematode, Haley Trumpy

Graduate Theses and Dissertations

The overall theme of the research reported in this dissertation was to discover and translate new genetic knowledge about genetic resistance of soybean cyst nematode (SCN). The research had three distinct projects. The first project addressed the hypothesis that there are no new QTL from alternate sources of SCN resistance. Five families of Recombinant Inbred Lines (RILs) derived from novel sources of resistance for races 1, 2, 3, and 5 were developed to test the hypothesis. The second and third projects addressed hypotheses based on the results of the first project. The second project addressed the hypothesis that there was ...


Intercropping And Relay Cropping To Increase Productivity, Resilience, And Long-Term Sustainability Of Corn And Soybean Cropping Systems In Iowa, Swetabh Patel Jan 2020

Intercropping And Relay Cropping To Increase Productivity, Resilience, And Long-Term Sustainability Of Corn And Soybean Cropping Systems In Iowa, Swetabh Patel

Graduate Theses and Dissertations

Soil erosion and nutrient loss as a result of lack of ground cover in conventional corn (Zea mays L.) and soybean [Glycine max (L.) Merr.] cropping systems in the U.S. Midwest warrant use of cover crops to provide improved protection to the soil. There are needs for alternate cropping systems and management practices capable of protecting our resources without sacrificing existing and future crop yield goals. Field pennycress (Thlaspi arvense L.) and winter camelina [Camelina sativa (L.) Crantz] are short season annual oilseed crops having the potential to be integrated into corn and soybean systems as cash cover crops ...


Effects Of Combining Two-Step Weaning With A Short-Term Creep Feeding Period On Preweaning Calf And Cow Performance And Post-Weaning Performance, Health, And Productivity, Kendi Elise Tjardes Jan 2020

Effects Of Combining Two-Step Weaning With A Short-Term Creep Feeding Period On Preweaning Calf And Cow Performance And Post-Weaning Performance, Health, And Productivity, Kendi Elise Tjardes

Graduate Theses and Dissertations

Two separate studies were conducted over a span of two years, combining the two-step weaning method with a short-term creep feed period. In a 2 x 2 factorial, 203 (year 1, n = 103; year 2, n = 100) purebred angus calves were ranked by gender, body weight (BW), age, dam parity, and sire group and then randomly assigned to one of four groups: 1) two-step weaned by inserting a nose flap 1 wk prior to weaning (NF), 2) traditionally weaned, separated from their dam on d 0 (TRAD), 3) traditionally weaned and creep fed, separated from their dam on d 0 ...


Using Smap And Smos Vegetation Optical Depth To Measure Crop Water In Vegetation, Kaitlin Togliatti Jan 2020

Using Smap And Smos Vegetation Optical Depth To Measure Crop Water In Vegetation, Kaitlin Togliatti

Graduate Theses and Dissertations

NASA's Soil Moisture Active Passive (SMAP) and European Space Agency's (ESA) Soil Moisture Ocean Salinity (SMOS) are two microwave remote sensing satellites. They were originally designed to measure soil moisture, but with an algorithm that already retrieves vegetation optical depth (VOD), they could also be used for vegetation measurements. VOD is the degree to which vegetation attenuates microwave radiation from the soil and may be an important product to quantify vegetation changes. SMAP and SMOS have some advantages to measure vegetation compared to existing practices. They can view the entire crop canopy as opposed to just the top ...


Returning To The Earth, Daniel Morley Jan 2020

Returning To The Earth, Daniel Morley

Graduate Theses and Dissertations

Life is another form of death. Together, they form an eternal cycle but for a majority of the past century, life and death have been seen as opposites and many have chosen to ignore the topic of death. In our unwillingness to address the topic, the Western burial practice that emerged out of the late 19th and early 20th centuries remained unquestioned for decades. It was not until recent years, with closer examination, Westerners began to realise some of these practices are environmentally unfavourable. For this and other reasons, many people have begun searching for alternative burial methods. This paper ...


Zinc To The Sink: Genetics Of Increased Zn In Maize Kernels, Edna Kemunto Mageto Jan 2020

Zinc To The Sink: Genetics Of Increased Zn In Maize Kernels, Edna Kemunto Mageto

Graduate Theses and Dissertations

Zinc (Zn) deficiency is a global health problem particularly in low- and middle-income countries where diets are cereal-based and typically lower in Zn. Biofortification, the genetic enhancement of staple foods through plant breeding is considered cost-effective and sustainable. Maize is one of the major crops grown and consumed in the regions where Zn deficiency is prevalent. But Zn concentration in maize kernels is insufficient to meet the requirements of humans. Therefore, breeding varieties with increased Zn concentration is an important goal for maize breeders.

To breed Zn-biofortified varieties, it is imperative to identify germplasm with high-Zn concentration, assess their potential ...


Study On The Wechat To Improve User Experience For Chinese Older Adults, Nan Hu Jan 2020

Study On The Wechat To Improve User Experience For Chinese Older Adults, Nan Hu

Graduate Theses and Dissertations

As a consequence of the one-child policy, the older adult population in China—defined as 55 years and older—has been growing geometrically over the past few decades. Meanwhile, urban expansion-part of China's modernization-gave rise to a situation in which young adults migrate to major cities, further stratifying the social structure in China and isolating older adult communities.

With 620 million active users, WeChat is the most popular all-in-one social media app on smartphones in China. It has been increasingly adopted by older adult users to cope with the challenge of loneliness and unhappiness due to social changes. However ...


Learning-Based Perception And Control With Adaptive Stress Testing For Safe Autonomous Air Mobility, Xuxi Yang Jan 2020

Learning-Based Perception And Control With Adaptive Stress Testing For Safe Autonomous Air Mobility, Xuxi Yang

Graduate Theses and Dissertations

The use of electrical vertical takeoff and landing (eVTOL) aircraft to provide efficient, high-speed, on-demand air transportation within a metropolitan area is a topic of increasing interest, which is expected to bring fundamental changes to the city infrastructures and daily commutes. NASA, Uber, and Airbus have been exploring this exciting concept of Urban Air Mobility (UAM), which has the potential to provide meaningful door-to-door trip time savings compared with automobiles. However, successfully bringing such vehicles and airspace operations to fruition will require introducing orders-of-magnitude more aircraft to a given airspace volume, and the ability to manage many of these eVTOL ...


Characterizing Disease Phenotype And Its Role In Epidemic Outcomes In A Wild Songbird, Rachel Morgan Ruden Jan 2020

Characterizing Disease Phenotype And Its Role In Epidemic Outcomes In A Wild Songbird, Rachel Morgan Ruden

Graduate Theses and Dissertations

Individual animals vary greatly in their responses to pathogenic challenge. One such response that remains understudied in animals is the ability to minimize the per-pathogen costs of infection on host fitness. Phenotypically, this presents as individuals with milder clinical signs of disease despite substantial pathogen burdens. Hosts that develop milder pathology, a measure of tissue damage, or express milder sickness behaviors are therefore described as being tolerant. Because tolerant hosts survive infection through damage limitation but not necessarily pathogen elimination, they may be more likely to infect others by shedding higher numbers of pathogen over longer windows of time. This ...