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Application Of The Fusion Model For Cognitive Diagnostic Assessment With Non-Diagnostic Algebra-Geometry Readiness Test Data, Robert H. Fay Jul 2018

Application Of The Fusion Model For Cognitive Diagnostic Assessment With Non-Diagnostic Algebra-Geometry Readiness Test Data, Robert H. Fay

Graduate Theses and Dissertations

This study retrofitted a Diagnostic Classification Model (DCM) known as the Fusion model onto non-diagnostic test data from of the University of Chicago School Mathematics Project (UCSMP) Algebra and Geometry Readiness test post-test used with Transition Mathematics (Third Edition, Field-Trial Version). The test contained 24 multiple-choice middle school math items, and was originally given to 95 advanced 6th grade and 293 7th grade students. The use of these test answers for this study was an attempt to show that by using cognitive diagnostic analysis techniques on test items not constructed for that purpose, highly predictable multidimensional cognitive attribute profiles for ...


Survey Research In Postsecondary Chemistry Education: Measurements Of Faculty Members’ Instructional Practice And Students’ Affect, Rebecca E. Gibbons Jun 2018

Survey Research In Postsecondary Chemistry Education: Measurements Of Faculty Members’ Instructional Practice And Students’ Affect, Rebecca E. Gibbons

Graduate Theses and Dissertations

Collection of data through survey-type measurements and analysis contributes rich, meaningful information to the chemical education research enterprise. This dissertation reports two strands of research that each contribute a “snapshot” of the state of chemical education on two different levels. The first uses survey research methods, collecting data from faculty members to learn about postsecondary chemistry education across the United States. The second uses survey instruments of student achievement emotions within the organic chemistry classroom, collecting longitudinal data to learn about the relationships of emotions with achievement over time. Both areas are of interest because chemical education research produces evidence-based ...


Evaluation Of Academic And Social Engagement In A Technology-Based Collaborative Approach To Inclusive Geoscience Field Learning, Anita Marie Stone Marshall Apr 2018

Evaluation Of Academic And Social Engagement In A Technology-Based Collaborative Approach To Inclusive Geoscience Field Learning, Anita Marie Stone Marshall

Graduate Theses and Dissertations

Field learning is an important aspect of geoscience education to teach or reinforce concepts and skills, and the highly social experience of field work can improve learning outcomes, create networks to support future academic success, and promote a sense of belonging in the geosciences. However, field learning presents significant barriers to participation for students with physical disabilities. The introduction of digital data collection and communication devices into traditional field work settings has created new opportunities to expand access to field learning experiences such as remote collaboration; a method of undertaking field work through collaborative teamwork and the use of digital ...


Coarse-Grained Modeling Studies Of Polymeric And Granular Systems, Hong Trung Nguyen Apr 2018

Coarse-Grained Modeling Studies Of Polymeric And Granular Systems, Hong Trung Nguyen

Graduate Theses and Dissertations

This Dissertation is devoted to computational study of the solidification, dynamics and mechanics of model semiflexible polymers with variable chain flexibility as well as a computational investigation of the clogging phenomena observed in granular materials.

Chain stiffness is an intrinsic factor that governs single-chain flexibility. It plays a critical role in the physics of polymeric materials. In this work, we employ a coarse-grained polymer model in which chain stiffness can be tuned by a single parameter (bending stiffness kb) that yields chain shape ranging from coil-like to rod-like in the flexible and very stiff limit respectively. In chapter 2, we ...


Computational Discovery Of Energetic Polynitrogen Compounds At High Pressure, Brad A. Steele Apr 2018

Computational Discovery Of Energetic Polynitrogen Compounds At High Pressure, Brad A. Steele

Graduate Theses and Dissertations

High-nitrogen-content energetic compounds containing multiple N-N bonds are an attractive alternative towards developing new generation of environmentally friendly, and more powerful energetic materials. High-N content translates into much higher heat of formation resulting in much larger energy output, detonation pressure and velocity upon conversion to large amounts of non-toxic, strongly bonded N2 gas. This thesis describes recent advances in the computational discovery of group-I alkali and hydrogen polynitrogen materials at high pressures using powerful first-principles evolutionary crystal structure prediction methods. This is highlighted by the discovery of a new family of materials that consist of long-sought after all-nitrogen N􀀀 5 ...


The Growing Together Project: Understanding Impacts On Field Day Attendees And Iowa Master Gardeners, Laura Irish Jan 2018

The Growing Together Project: Understanding Impacts On Field Day Attendees And Iowa Master Gardeners, Laura Irish

Graduate Theses and Dissertations

Citizen science has been shown to be an effective tool for increasing data collection, as well as a great benefit to those who participate in the research project. The rising costs and limited funding for conducting large-scale research projects make citizen science projects valuable assets for researchers. Understanding the impact of citizen science projects on the volunteers must be done to better engage with and retain the volunteers. The Growing Together project, a partnership between the ISU Extension and Outreach Master Gardener program and the Human Sciences Extension, was created to increase food security in Iowa. The two major components ...


A Sustainable Campus For The Higher Education Institutions In The U.S., Md Imtiajul Alam Jan 2018

A Sustainable Campus For The Higher Education Institutions In The U.S., Md Imtiajul Alam

Graduate Theses and Dissertations

The green and sustainable campus concept is not something new to US universities, but well-organized and coherent activities to effectively “green” campuses are not that common, and efforts are minor in comparison to the potential of these universities. This thesis investigates different approaches taken by higher education (HE) institutions that are considered successful in their objectives toward achieving a sustainable campus. It also examines the process of integration of sustainability into the higher education institution’s policy, pedagogy, and research process; approaches taken by HE institutions aim to impact students’ perceptions and their behavior toward the world that they will ...


The Performance Of Multilevel Structural Equation Modeling (Msem) In Comparison To Multilevel Modeling (Mlm) In Multilevel Mediation Analysis With Non-Normal Data, Thanh Vinh Pham Nov 2017

The Performance Of Multilevel Structural Equation Modeling (Msem) In Comparison To Multilevel Modeling (Mlm) In Multilevel Mediation Analysis With Non-Normal Data, Thanh Vinh Pham

Graduate Theses and Dissertations

The mediation analysis has been used to test if the effect of one variable on another variable is mediated by the third variable. The mediation analysis answers a question of how a predictor influences an outcome variable. Such information helps to gain understanding of mechanism underlying the variation of the outcome. When the mediation analysis is conducted on hierarchical data, the structure of data needs to be taken into account. Krull and MacKinnon (1999) recommended using Multilevel Modeling (MLM) with nested data and showed that the MLM approach has more power and flexibility over the standard Ordinary Least Squares (OLS ...


Application Of Metamaterials To Rf Energy Harvesting And Infrared Photodetection, Clayton M. Fowler Nov 2017

Application Of Metamaterials To Rf Energy Harvesting And Infrared Photodetection, Clayton M. Fowler

Graduate Theses and Dissertations

Techniques for adapting metamaterials for the improvement of RF energy harvesting and infrared photodetection are demonstrated using experimental and computer simulation methods. Two methods for RF energy harvesting are experimentally demonstrated and supported by computer simulation. In the first method, a metamaterial perfect absorber (MPA) is made into a rectenna capable of harvesting RF energy and delivering power to a load by soldering Schottky diodes onto connected split ring resonator (SRR) structures composing the planar metasurface of the perfect absorber. The metamaterial rectenna is accompanied by a ground plane placed parallel to it, which forms a Fabry-Perot cavity between the ...


Surfaces And Epitaxial Films Of Corundum-Structured Mixed Metal Oxides., Alan Richard Kramer Nov 2017

Surfaces And Epitaxial Films Of Corundum-Structured Mixed Metal Oxides., Alan Richard Kramer

Graduate Theses and Dissertations

Throughout the last half century of materials science, significant motivations came from, and still do, the industrial applications of these materials. Whether it is electronic, thermal, tribological or chemical in nature, the study of metals, semiconductors and insulators eventually reveals that the surface plays a significant part in the properties of these materials. Understanding metal terminations reveals often that an oxide is the stable state of the metallic surface in an ambient atmosphere and the ability to predict and control these oxides has led to significant strides forward in not just the metallic bulk but the oxide as well.

Here ...


Thermodynamic And Kinetic Aspects Of Hen Egg White Lysozyme Amyloid Assembly, Tatiana Miti Nov 2017

Thermodynamic And Kinetic Aspects Of Hen Egg White Lysozyme Amyloid Assembly, Tatiana Miti

Graduate Theses and Dissertations

Deposition of protein fibers with a characteristic cross-β sheet structure is the molecular marker associated with human disorders ranging from Alzheimer's disease to type II diabetes and spongiform encephalopathy. Given the large number of non-disease related proteins and peptides that have been shown to form amyloid fibrils in vitro, it has been suggested that amyloid fibril formation represents a generic protein phase transition. In the last two decades it has become clear that the same protein/peptide can assemble into distinct morphologically and structurally amyloid aggregates depending on the solution conditions. Moreover, recent studies have shown that the early ...


Investigating Students’ Basic Needs And Motivation In College Chemistry Courses With The Lens Of Self-Determination Theory, Yujuan Liu Jun 2017

Investigating Students’ Basic Needs And Motivation In College Chemistry Courses With The Lens Of Self-Determination Theory, Yujuan Liu

Graduate Theses and Dissertations

More graduates in science, technology, engineering, and mathmetics (STEM) fields are needed to keep our nation’s preeminance in the global fields of technology and science. However, fewer than 40% of students who intend to major in STEM fields when entering college complete a STEM degree. Therefore, it is important to explore factors to improve student persistence in STEM fields at the college level as well as to understand the interrelationship between student motivation, academic achievement, and persistence. Motivation is strongly associated with student achievement and persistence; meanwhile, academic achievement can also affect persistence. Self-determination theory (SDT) represents a framework ...


Prevalence Of Typical Images In High School Geometry Textbooks, Megan N. Cannon Jun 2017

Prevalence Of Typical Images In High School Geometry Textbooks, Megan N. Cannon

Graduate Theses and Dissertations

Visualization in mathematics can be discussed in many ways; it is a broad term that references physical visualization objects as well as the process in which we picture images and manipulate them in our minds. Research suggests that visualization can be a powerful tool in mathematics for intuitive understanding, providing and/or supporting proof and reasoning, and assisting in comprehension. The literature also reveals some difficulties related to the use of visualization, particularly how illustrations can mislead students if they are not comfortable seeing concepts represented in varied ways. However, despite the extensive research on the benefits and challenges of ...


Sustainable Development Through Urban Agriculture, Eric R. R. Weaver Mar 2017

Sustainable Development Through Urban Agriculture, Eric R. R. Weaver

Graduate Theses and Dissertations

This document includes three completed publications to represent Urban Agriculture as a ideal solution to meet the UN Sustainable Development Goals. The first publication (Weaver, 2017a) provided in Chapter Two examines the stormwater Best Management Practices (BMP) modelling parameters for the current EPA Stormwater Management Model (SWMM) as the first step to developing Urban Agriculture BMPs. The second publication (Weaver, 2015) provided in Chapter Three highlights how many high-rated scholars have identified agriculture as a critical driver for the planetary systems impacts we find with community development. The third publication (Weaver, 2017b) provided in Chapter Four breaks down a completely ...


Measuring The Testing Mode In General Chemistry: The Effect Of Computer Versus Paper Mode On Test Performance, Cognitive Load, And Scratch Paper, Anna Agripina Prisacari Jan 2017

Measuring The Testing Mode In General Chemistry: The Effect Of Computer Versus Paper Mode On Test Performance, Cognitive Load, And Scratch Paper, Anna Agripina Prisacari

Graduate Theses and Dissertations

The purpose of this dissertation was to study the effect of testing mode (giving a test on computer versus paper) in authentic classroom environments. Specifically, this work sought to broaden the pedagogical implications of testing mode by examining variations between computer and paper mode in student test performance, cognitive load, and use of scratch paper. Data were collected from students who were enrolled in undergraduate general chemistry courses. Students took multiple proctored general chemistry tests that included a variety of chemistry topics and three question types: algorithmic, conceptual, and definition. After each test students were provided with correct-answer feedback. The ...


Placed: Assessing The Developmental Progression Of Remedial Math Students At A Large Midwestern Community College Using Aleks, Jeanice Ann Mccarville Kerber Jan 2017

Placed: Assessing The Developmental Progression Of Remedial Math Students At A Large Midwestern Community College Using Aleks, Jeanice Ann Mccarville Kerber

Graduate Theses and Dissertations

The focus of this study was to investigate the developmental climb of students at one large Midwestern community college based on their Assessment and Learning in Knowledge Spaces (ALEKS) placement scores in remedial mathematics. Specifically, the purpose of this research study was to assess and explore the predictors of student progression and their progression rates in remedial math at this college. Remediation is important because of the nature of the community college with its open access that attracts underprepared students. Further, community colleges are growing in popularity and are often used as a stepping stone for students who may be ...


Development And Validation Of A Remote Sensing Model To Identify Anthropogenic Boreholes That Provide Dry Season, Refuge Habitat For Anopheles Vector Mosquitoes In Sub-Saharan Africa, James Pkemoi Kukat Jun 2016

Development And Validation Of A Remote Sensing Model To Identify Anthropogenic Boreholes That Provide Dry Season, Refuge Habitat For Anopheles Vector Mosquitoes In Sub-Saharan Africa, James Pkemoi Kukat

Graduate Theses and Dissertations

A lack of surveillance systems is an impediment to public health intervention for perennial vector-borne disease transmission in northern tropical savanna region of Kenya. The population in this area are mostly poor nomadic pastoralists with little acquired functional immunity to Plasmodium falciparum, due to infrequent challenges with the parasite. A common characteristic in tropical savanna climatic zone is the availability of riverbeds that have anthropogenic boreholes that provide malaria vector mosquitoes, such as Anopheles gambiae s.l and Anopheles funestus, with aquatic refuge habitats for proliferation and endemic transmission to proximity human households during the dry-season. Unfortunately, currently there have ...


A Mixed Methods Study Of The Effects Of Clicker Use On Math Anxiety And Achievement In Mathematics, John Herbert Batchelor Jan 2016

A Mixed Methods Study Of The Effects Of Clicker Use On Math Anxiety And Achievement In Mathematics, John Herbert Batchelor

Graduate Theses and Dissertations

Many large lecture classes at undergraduate institutions have started to utilize technology to engage students. A mixed methods design was used in this dissertation research to build a comprehensive understanding of the statistical relationships among mathematics anxiety, math self-efficacy, and achievement in mathematics among students in a large lecture, undergraduate calculus class taught using clickers. The purpose of this study was to develop an understanding of the statistical relationships and of the students’ experiences and perspectives on the relationships among mathematics self-efficacy, math anxiety, and achievement, along with the effect of clicker use on these variables, with attention given to ...


A Mixed Methods Study Of The Effects Of Clicker Use On Math Anxiety And Achievement In Mathematics, John Herbert Batchelor Jan 2016

A Mixed Methods Study Of The Effects Of Clicker Use On Math Anxiety And Achievement In Mathematics, John Herbert Batchelor

Graduate Theses and Dissertations

Many large lecture classes at undergraduate institutions have started to utilize technology to engage students. A mixed methods design was used in this dissertation research to build a comprehensive understanding of the statistical relationships among mathematics anxiety, math self-efficacy, and achievement in mathematics among students in a large lecture, undergraduate calculus class taught using clickers. The purpose of this study was to develop an understanding of the statistical relationships and of the students’ experiences and perspectives on the relationships among mathematics self-efficacy, math anxiety, and achievement, along with the effect of clicker use on these variables, with attention given to ...


Developing Interactive Learning For Environmental Issues, Meriesa C. Elliott Jan 2016

Developing Interactive Learning For Environmental Issues, Meriesa C. Elliott

Graduate Theses and Dissertations

The environment is being negatively affected by the behavior of human beings. Climate change, while a natural occurrence, is happening at an unnatural pace, sped up by human actions. Even with these things in mind, it seems an impossible task to get people to move toward positive environmental impacts. While many people are aware of environmental issues, they don’t fully understand what actions are contributing to the problems, what alternative options they have, or how they can help alleviate the problem. With that in mind, I examine how effective interactive design can be at creating a learning environment by ...


Using A Pen Pal Program To Assess Student Learning Through Culture And School Gardens, Samantha Kae Green Jan 2016

Using A Pen Pal Program To Assess Student Learning Through Culture And School Gardens, Samantha Kae Green

Graduate Theses and Dissertations

Youth at two schools (St. John, USVI and West Liberty, IA) participated in the I Grow Culture Pen Pal Program. The purpose of the 9-week program was to evaluate middle school student's increase in knowledge and confidence related to communicating local gardening, cultural understanding and sustainability. The collaborating schools were specifically chosen because they each meet the criteria of having a garden for middle school students to integrate English and science into their agriculture curriculum. The objectives of this program were to increase awareness of garden sustainability, understand place-based gardening and environmental sciences, while establishing a garden-based distance cultural ...


Ratios And Benchmarks As Tools For Local Food Hub Decision-Making: A Comparative Case Study, Savanna May Lyons Jan 2016

Ratios And Benchmarks As Tools For Local Food Hub Decision-Making: A Comparative Case Study, Savanna May Lyons

Graduate Theses and Dissertations

Food hubs, or local food aggregation and distribution businesses, are triple-bottom-line firms that play an increasingly important role in connecting small and mid-sized farmers to wholesale and retail markets. This paper explores how food hubs can use their financial data to identify and address strengths and challenges in their operations. We propose a “dashboard” of key metrics and benchmarks for food hub managers, and apply it a comparative case study of four food hubs over three years of operations. We compare and contrast the liquidity, cash flow, efficiency, solvency and repayment capacity of the four cases, and analyze cross-cutting themes ...


Understanding Climate Change And Sea Level: A Case Study Of Middle School Student Comprehension And An Evaluation Of Tide Gauges Off The Panama Canal In The Pacific Ocean And Caribbean Sea, Juan Carlos Millan-Otoya Nov 2015

Understanding Climate Change And Sea Level: A Case Study Of Middle School Student Comprehension And An Evaluation Of Tide Gauges Off The Panama Canal In The Pacific Ocean And Caribbean Sea, Juan Carlos Millan-Otoya

Graduate Theses and Dissertations

The present study had two main objectives. The first was to determine the degree of understanding of climate change, sea level and sea level rise among middle school students. Combining open-ended questions with likert-scaled questions, we identified student conceptions on these topics in 86 students from 7th and 8th grades during 2012 and 2013 before and after implementing a Curriculum Unit (CU). Additional information was obtained by adding drawings to the open-ended questions during the second year to gauge how student conceptions varied from a verbal and a visual perspective. Misconceptions were identified both pre- and post-CU among ...


Sound Attenuation Performance Of Fiber-Reinforced Polymer Composite Circumaural Hearing Protection Devices, Steven Christopher Augustine Jan 2015

Sound Attenuation Performance Of Fiber-Reinforced Polymer Composite Circumaural Hearing Protection Devices, Steven Christopher Augustine

Graduate Theses and Dissertations

Personnel who work on the flight deck of an aircraft carrier are exposed to extreme levels of jet engine noise often in excess of 140 decibels (dB). The current circumaural hearing protective devices (CAHPD) employed by flight deck crewmen are inadequate for the level of protection required for these extreme levels of noise. Fiber-reinforced thermoset polymer composite (FRPC) materials such as aramid fibers used in body armor, have high theoretical values of acoustic impedance due to a fundamentally high modulus of elasticity and may offer a superior level of hearing protection over original equipment (OE) thermoplastic CAHPDs. The objective of ...


Pedology Of Corn Productivity Indices For Selected Parts Of Southern Highland Zone Of Tanzania, Johnson Godlove Mtama Jan 2015

Pedology Of Corn Productivity Indices For Selected Parts Of Southern Highland Zone Of Tanzania, Johnson Godlove Mtama

Graduate Theses and Dissertations

Scientific investigations to determine land use planning and interpretations for corn productivity potential in the Southern Highland Zone of Tanzania were conducted. The assessment of soils corn growth potential has been conducted in four selected pedons namely; Uyole, Mbimba, Inyala and Seatondale. Pedological, physical, chemical characterization and an attempt to develop the pedotransfer functions were done. The results show that the soils have deep to very deep sola, subangular blocky structures, evidence of pedogenic clay movement, fine to coarse texture, bulk density ranged from 0.79 to 1.46 g/cm3, pH ranged from slightly acidic to slightly alkaline, cation ...


Optical Responses At The Nanoparticle-Biological Interface With An Introduction To Optical Microscopy In Undergraduate Analytical Chemistry Curriculum, Ashley Elizabeth Augspurger Jan 2015

Optical Responses At The Nanoparticle-Biological Interface With An Introduction To Optical Microscopy In Undergraduate Analytical Chemistry Curriculum, Ashley Elizabeth Augspurger

Graduate Theses and Dissertations

Plasmonic nanoparticles have been gaining attention in the medical field for their use as chemical and biological sensors, drug delivery vectors and contrast agents for cellular imaging; however, the ability to monitor the chemical binding events and drug delivery kinetics is limited. The majority of this body of work explores nanoparticles optical responses as they undergo energy transfer processes for biological sensing. The latter portion of this dissertation discusses optical microscopy in undergraduate analytical chemistry.

In the first experiment, plasmon resonance energy transfer between gold nanospheres and cytochrome c was investigated. As cytochrome c adsorbs to the surface of a ...


Applications Of Technology And Large Data In Statistics Education And Statistical Graphics, Karsten Tait Maurer Jan 2015

Applications Of Technology And Large Data In Statistics Education And Statistical Graphics, Karsten Tait Maurer

Graduate Theses and Dissertations

This dissertation is a composite of research preformed in the fields of statistics education and statistical graphics. The three body chapters stand as the pillars of this work; tied together by the common theme of overcoming challenges and grasping opportunities that are posed by emerging technologies and prodigious data sources. In Chapter 1 a review of the literature is conducted to lay the foundation upon which the work of the main body chapters is built. Chapter 2 is an educational experiment comparing the learning outcomes from simulation-based and traditional statistical inference curricula. Chapter 3 studies the development of a shiny ...


Analyzing The Role Of Science Practices In General Chemistry Courses And Assessments, Jessica Jewett Reed Jan 2015

Analyzing The Role Of Science Practices In General Chemistry Courses And Assessments, Jessica Jewett Reed

Graduate Theses and Dissertations

Efforts to reform science education, such as the Next Generation Science Standards (NGSS), call for a shift away from rote learning over a breadth of content topics toward a deeper conceptual understanding of both content knowledge and skill within a discipline. Science practices are a key component of the NGSS, and combine knowledge and skill to emphasize what a student should be able to do with course content. As the NGSS are implemented on a broader scale, new methods of assessment will be needed that incorporate measures of student performance beyond content proficiency. While these reform efforts are aimed at ...


The Development And Use Of A Web-Based Assessment To Measure Students' Use Of Representations In General Chemistry, Jack Polifka Jan 2015

The Development And Use Of A Web-Based Assessment To Measure Students' Use Of Representations In General Chemistry, Jack Polifka

Graduate Theses and Dissertations

Being able to use representations is a fundamental skill in chemistry. It is important for instructors to make sure that students are proficient in using them in the classroom. Until now, research related to students' use of representations as mainly focused on the knowledge differences between experts vs novices and what misconceptions students have while using representations. This study sought to contribute to that research by investigating which types of representations students use by the way of a web-based assessment which was able to track student representation use, including time spent accessing specific representations within a set of five possibilities ...


Epibenthic Mobile Invertebrates Along The Florida Reef Tract: Diversity And Community Structure, Kristin Netchy May 2014

Epibenthic Mobile Invertebrates Along The Florida Reef Tract: Diversity And Community Structure, Kristin Netchy

Graduate Theses and Dissertations

Benthic mobile invertebrates are important components of coral-reef diversity and community structure, though, in most cases, their ecological contributions are poorly known. Baseline information on their diversity, prevalence, assemblages, and ecological roles is needed to aid in the conservation of coral-reef habitats. The objectives of this study are to 1) describe diversity and assemblages of epibenthic, mobile invertebrates in shallow water coral-reef communities in Florida, 2) evaluate their ecological roles by reviewing published literature on diet, and 3) measure the degree of linear dependence between mobile invertebrates and scleractinian corals. Underwater surveys were conducted in the summer of 2013 at ...