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Freeze Extrusion Fabrication Of 13-93 Bioactive Glass Scaffolds For Bone Repair, Nikhil D. Doiphode

Masters Theses

"We have investigated Freeze Extrusion Fabrication (FEF) of 13-93 bioactive glass to fabricate three dimensional scaffolds for bone tissue engineering. Bioactive glass paste was prepared for consistent extrusion through micro-nozzle and controlled porosity scaffolds were fabricated using additive manufacturing FEF. CAD models were prepared for different scaffold designs and computer controlled layer-by-layer deposition of pseudoplastic paste was carried out to in accordance. Liquid nitrogen assisted freezing of pastes was used for the consolidation of deposited layers. Post processing binder burnout and sintering schedules were designed for evaporation of organic binder and densification of glass. Sintering shrinkage was measured, and X-ray …

Implementation Of Integrated Function Structure And Object-Oriented Design Framework, Qiong Gao

Masters Theses

"The function structure method is commonly used in mechanical product design. Although a function structure allows defining all the functions of the components of a product and their interactions, it does not have an effective architecture for the software design of a mechatronic product. An integrated function structure and object-oriented design framework was recently developed to overcome this disadvantage. In this thesis, the implementation of this framework to design several products in different categories, including an inkjet printer, and electric screwdriver and a vacuum cleaner, is discussed. The design results obtained using the new framework are compared to the design …

Chemical Bath Deposition And Electrodeposition Of Epitaxial Semiconductor Materials For Application In Photovoltaic Devices, Guojun Mu

Doctoral Dissertations

"This dissertation investigates the chemical bath deposition of zinc oxide and electrodeposition of cuprous iodide on polycrystalline and single crystal substrates. Paper I describes the chemical bath deposition and characterization of titled epitaxial zinc oxide nanospears on Si(001) single crystal substrate. In Paper II, the chemical bath deposition of zinc oxide nanospears from highly alkaline solutions is discussed in detail, including a thermodynamic calculation of saturation and speciation of Zn(II) in aqueous solution, and a kinetic study of the deposition process. In this paper the epitaxial zinc oxide is reported grown on Au(100), (110), and (111) single crystals. Paper III …

The Intraspecific Phylogeography Of The Blue-Spotted Salamander, Ambysotma Laterale, Jade Shawndee East

Dissertations and Theses @ UNI

The amphibian diversity of Iowa has been in a constant state of flux in response to several environmental forces over the past 14,000 years. Most amphibians require a moist environment in which to live, and aquatic habitats for reproduction. Ambystoma laterale is one of the few salamanders found in the state of Iowa and is one of two found on Iowa's endangered species list. Unfortunately, A. laterale has only been observed in two counties in Iowa, Blackhawk and Linn. The blue-spotted salamander (Ambystoma laterale) has the northern-most distribution of any North American salamander and primarily occurs in areas that were …

Intelligent Power System Operation In An Uncertain Environment, Yusuf Yare

Doctoral Dissertations

"This dissertation presents some challenging problems in power system operations. The efficacy of a heuristic method, namely, modified discrete particle swarm optimization (MDPSO) algorithm is illustrated and compared with other methods by solving the reliability based generator maintenance scheduling (GMS) optimization problem of a practical hydrothermal power system. The concept of multiple swarms is incorporated into the MDPSO algorithm to form a robust multiple swarms-modified particle swarm optimization (MS-MDPSO) algorithm and applied to solving the GMS problem on two power systems. Heuristic methods are proposed to circumvent the problems of imposed non-smooth assumptions common with the classical approaches in solving …

Theoretical Study Of Electron Impact-Ionization Of Molecules, Ola Al-Hagan

Doctoral Dissertations

"There has been impressive progress in the area of theoretical treatments of electron impact ionization (e,2e) of atoms and molecules in the last decade. Most recently, low to intermediate incident electron energies have been reported for molecular systems. In this dissertation, different theoretical models will be used to calculate the fully differential cross section (FDCS) for (e,2e) processes for low to intermediate incident electron energies for a variety of final state electron angles and energies for the diatomic molecules H₂ and N₂, the triatomic molecule H₂O, and the biomolecule HCOOH.

In addition, there has been a large amount of interest …

Protein Secondary Structure Prediction Using Blast And Relaxed Threshold Rule Induction From Coverings, Leong Lee

Doctoral Dissertations

"Protein structure prediction has always been an important research area in bioinformatics and biochemistry. Despite the recent breakthrough of combining multiple sequence alignment information and artificial intelligence algorithms to predict protein secondary structure, the Q₃ accuracy of various computational prediction methods rarely has exceeded 75%; this status has changed little since 2003 when Rost stated that "the currently best methods reach a level around 77% three-state per-residue accuracy." The application of artificial neural network methods to this problem is revolutionary in the sense that those techniques employ the homologues of proteins for training and prediction. In this dissertation, a different …

Effect Of Structure And Plasticizer On The Glass Transition Of Adsorbed Polymer, Boonta Hetayothin

Doctoral Dissertations

"The effect of molecular mass on adsorbed poly(methyl methacrylate) (PMMA) on silica was determined using temperature-modulated differential scanning calorimetry (TMDSC). A two-component model, based on loosely-bound polymer (glass transition temperature, T_g, similar to that of bulk) and tightly-bound polymer (T_g higher than that of bulk) was used to interpret the thermograms. Similar amounts of tightly-bound polymer were found for 450 and 85 kDa PMMA (0.78 mg/m²), while the 32 kDa sample had a smaller amount (0.48mg/m²). A comparison of adsorbed PMMA, poly(vinyl acetate) (PVAc), and poly(methyl acrylate) (PMA) on silica was made using the same technique. The …

Scaled Experimental Study On Excavation Of Lunar Regolith With Rakes/Rippers And Flat Blade, Masafumi Iai

Doctoral Dissertations

"As humanity's activities expand to the Moon, Mars, and other extra-terrestrial bodies, it will be necessary to use local resources rather than bringing everything from the Earth. This concept is called In-Situ Resource Utilization (ISRU), which starts with excavation and earthmoving. The present study focuses on loosening and moving of the lunar regolith by a ripper (or rake) and a wide blade with consideration of gravel content. After characterizing the lunar regolith and two of its simulants (JSC-1A and FJS-1), the relationship between the excavation energy and different conditions, namely gravel content, relative density, and tine spacing on a rake, …

Synthesis And Characterization Of Conducting Polymer Nanostructures And Their Application In Sensors, Zhe-Fei Li

Doctoral Dissertations

"A one-step synthesis technique has been used to fabricate sensors by growing polyaniline nanofibers and polyaniline/metal nanocomposites in the active area of an interdigitated electrode array. Polyaniline nanofiber sensors can be fabricated by irradiating an aqueous precursor solution containing aniline, HCl, a metal salt, and ammonium persulfate (APS) with a high pressure Hg lamp. The sensors are ready for operation after polymerization is complete, and no additional processing steps are necessary. These sensors showed faster and more intensity response to various organic vapors than conventional bulk polyaniline sensors due to their larger surface area. A chemisorption model and a diffusion …

Ultracapacitor Character Analysis And Its Application In Unified Power Quality Conditioner As Energy Storage System, Xiaomeng Li

Doctoral Dissertations

"This dissertation focuses on the Ultracapacitor (UCAP) character analysis and its application in Unified Power Quality Conditioner (UPQC) as an Energy Storage System (ESS) for improved UPQC performance. It includes three parts as described below. The first part is Paper I. The UCAP is a popular choice for the ESS because of its distinct characters. In the application UCAP's transient behavior need to be studied for design purpose. Usually these transient characters are not shown in the product data sheet. In this paper UCAP frequency analysis is performed, and based on the test data the equivalent model of the UCAP …

The Beginning Of The End? Agricultural Modernization And Dissolution Of The Peasantry In Contemporary China, Qian Forrest Zhang, John A. Donaldson

Research Collection School of Social Sciences

No abstract provided.

Mate Selection, Margaret J. Cason, Norman P. Li

Research Collection School of Social Sciences

"It is a truth universally acknowledged that a single man in possession of a good fortune must be in want of a wife"—so wrote Jane Austen in Pride and Prejudice. From classic literature to contemporary screenplays, from the latest celebrity news to office gossip, it is nearly impossible to escape the pervasive topic of romantic relationships. Indeed, the pursuit of mates consumes a significant portion of our time and energy, and for good reason—mates give us companionship, pleasure, comfort, security, and even health benefits. As we discuss in this article, there are two major theoretical perspectives for understanding mate selection. …

Correlation: The Early Years, Michael A. Goodman

Faculty Publications

Elder Bruce C. Hafen has stated, “Few superlatives could overstate the historical importance of correlation, both as a doctrinal concept and as an organizational movement.”1 Yet, despite the importance of correlation, little has been published regarding its history. Though included as a topic in biographies about David O. McKay, Harold B. Lee, and Neal A. Maxwell, each account focused more on the individuals’ involvement in correlation than the history of correlation itself. Therefore, each account had large gaps in the history. This article will present the history of correlation from the turn of the twentieth century until 1960. Though access …

An Excuse I’Ve Beenworking On For Awhile, Joey Franklin

Faculty Publications

I put bras in the dryer and forget to refill the toilet paper, and I left the milk on the counter this morning. Again. But I ask for directions and say “I love you,” and I almost never leave hair on the soap. Which means, I suppose, I’m not entirely without hope.

I wonder about the implication that most men are just hopeless. And I wonder more about manhood in general—that infernal euphemism: asserted, displayed, defended, envied—cut off in a jealous rage.

I am haunted by the myth and misogyny of “manhood.” Phallic shadows of who I’m “supposed” to be …

Parametric Investigation Of A Dielectric Barrier Dishcarge Plasma Actuator, Narender Goud Bejawada

Mechanical Engineering and Applied Mechanics

The dielectric barrier discharge (DBD) plasma actuator is considered an effective flow control device in various aerospace applications such as drag control, lift control, and stall control. The DBD plasma actuator has many potential benefits in active flow control applications, such as an absence of moving parts and low power draw. Numerous studies have been done to estimate the effect of plasma flow on specific aerospace applications. These studies have revealed that the performance of the plasma actuator depends on a number of parameters, such as operating voltage and currents, materials, and the surrounding air velocity, to name a few. …

Self-Regulation As A Mediator Between Sibling Relationship Quality And Early Adolescents’ Positive And Negative Outcomes, Laura M. Padilla-Walker, James M. Harper, Alexander C. Jensen Phd

Faculty Publications

The current study examined the role of adolescents’ self-regulation as a mediator between sibling relationship quality and adolescent outcomes, after controlling for the quality of the parent-child relationship. Participants were 395 families (282 two parent; 113 single parent) with an adolescent child (M age of child at Time 1 = 11.15, SD = .96, 49% female) who took part in [project name masked for blind review] at both Time 1 and Time 2. Path analysis via structural equation modeling suggested that sibling affection was longitudinally and positively related to self-regulation and prosocial behaviors, and negatively related to externalizing behaviors; while …

"Life Is Beautiful, Or Is It?" Asked Jakob The Liar, Ilona Klein

Faculty Publications

In 1999 the 71st Academy Awards ceremony awarded to the film The Last Days the prize for Best Documentary Feature. Underwritten by Steven Spielberg's Survivors of the Shoah Visual History Foundation, this documentary depicts in a compelling, historically objective fashion what the Nazi regime called the "Endlösung" ["Final Solution"]: the effort to annihilate all of European Jewry. In the film, five Hungarian survivors are interviews with honesty and compassion. Their answers record history as it unwound. Clearly, the intent of the interviews is to assure that historical facts are not falsified, nor taken for granted. Documentaries of this kind can …

The Need For Evidence-Based, Spiritually Oriented Psychotherapies, P. Scott Richards, Everett L. Worthington Jr.

Faculty Publications

Despite a proliferation of spiritually oriented psychotherapies during the past 2 decades in the mental health professions, outcome research is lacking. In this present article, 6 published outcome reviews that shed light on the efficacy of these psychotherapies are discussed. Although there is general support for the efficacy of spiritually oriented treatment approaches, the data base is relatively small and has methodological limitations. Spiritually oriented cognitive approaches for religious clients with depression and anxiety meet evidence- based standards of efficacy. Several other spiritually oriented approaches are probably efficacious but need additional investigation. Methodological recommendations for improving the quality of future …

The Role Of Inspiration In The Helping Professions, Kari A. O'Grady, P. Scott Richards

Faculty Publications

This qualitative research study examined the ways that helping professionals experi- ence inspiration, as defined as divine guidance or influence, in their therapeutic work. It also explored their beliefs about how helping professionals can seek inspiration in their work. Open-ended survey questions from 333 respondents from a diverse range of religious and professional backgrounds were qualitatively analyzed. The themes ex- tracted give insight into the ways that these helping professionals have experienced inspiration in their work and about how helping professionals can facilitate a spiritual space in the therapeutic context.

Estimating The Prevalence And Frequency Of The Adolescent Drug Use: Do The Models Fit The Measures?, John P. Hoffmann, Stephen J. Bahr

Faculty Publications

We critically review recent studies to examine the measurement schemes and empirical models used to examine adolescent drug use, with a particular eye toward determining whether differences between the prevalence and frequency of use have been addressed. Several theoretical models suggest that there are differences but we find relatively few studies that have considered prevalence versus frequency, even though selection effects that dictations these processes affect conclusions about predictors of drug use. Using data from the 2004 U.S. National Survey of Drug Use and Health (NSDUH), (n=16,235), we provide an empirical example of why distinguishing prevalence and frequency of use …

Effects Of Jamestown-Yorktown's Educational Program On Fourth Grade Students' Standards Of Learning Score In Virginia Studies, Roger Hohensee

OTS Master's Level Projects & Papers

The purpose of this study was to determine if Jamestown-Yorktown's educational program had an effect in fourth grade students' Standards of Learning score in Virginia Studies.

Freshmen English Grade Point Average At Piedmont Virginia Community College Correlates To Success On Old Dominion University's Exit Examination Of Writing Proficiency, Louise Schatz

OTS Master's Level Projects & Papers

The problem of this study was to determine if transfer student's grades in 100 and 200 level English classes from Piedmont Virginia Community College are a predictor of initial pass rates on Old Dominion University's Exit Examination of Writing Proficiency.

Determining Attitudes Of Middle School History Teachers Toward Integrating Contextual Learning Projects Into The Core Curriculum, Amanda Roberts

OTS Master's Level Projects & Papers

The problem of this study was to determine the attitudes of middle school history teachers toward integration of contextual learning activities into their academic curriculum to enhance student learning.

Employees' Attitudes And Perceptions Toward Training Opportunities At Joint Transformation Command-Intelligence Norfolk, Virginia, Kisha Wilkins

OTS Master's Level Projects & Papers

The purpose of this study was to conduct an analysis of junior and senior civilians' attitudes toward training and professional development at Joint Transformation Command-Intelligence.

Evaluation Of The Effectiveness Of Hands-On Corrosion Control Training Using Metered Resistance Measurements To Assess Sailors' Comprehension, Douglas Nichols

OTS Master's Level Projects & Papers

The problem of this study was to evaluate the success of combat systems topside preservation training using a cost effective method to self-assess the efficiency of shipboard corrosion control procedures.

Perceptions Of Company Officer Competency By Firefighters And Company Officers Of Norfolk Fire-Rescue, Paul Savage

OTS Master's Level Projects & Papers

The problem of this study was to compare the perceptions of Norfolk Fire-Rescue firefighters, Lieutenants, and Captains of the level of competency of Norfolk Fire-Rescue company officers as prescribed by NFPA Standard 1021.

Effectiveness Of Using Inquiry Based Instruction To Increase Students Performance In High School Biology As Bardwell Institute, Keli Blyth

OTS Master's Level Projects & Papers

The problem of this study was to determine if student learning was enhanced through the use of inquiry teaching methods in high school biology.

Availability Of Electronic Copies Of Instructional Materials For Career And Technical Education, Farid Safarmamadov

OTS Master's Level Projects & Papers

The purpose of this study was to determine the availability of electronic copies of state level curriculum materials for career and technical education.

Computer Based Instruction And Its Effects On 21st Century Learners, Molly Knaack

OTS Master's Level Projects & Papers

The problem of this study was to determine if the use of computer assisted instruction enhanced the performance of students in Algebra 1.