Digital Commons Network^™

Assessment Of Nanostructured Capillary Wicks For Passive, Two-Phase Heat Transport, R. Ranjan, S V. Garimella, J. Y. Murthy, K. Yazawa

CTRC Research Publications

The major factors limiting the thermal performance of passive two-phase heat-spreading devices are the ability of the wick structures to transport liquid by means of capillary forces and the thermal resistance posed by the wicks. Nanoscale geometric enhancements to the wick structure, through the use of carbon nanotubes and metallic nanowires, promise to enhance the capillary transport while at the same time decreasing the thermal resistance due to their high intrinsic thermal conductivity. We analyze the performance of nanostructured wicks in heat-spreading applications. We report that the flow resistance of nanostructures constitutes a major barrier to their use as passive …

Covering Systems Of Polynomial Rings Over Finite Fields, Michael Wayne Azlin

Electronic Theses and Dissertations

In 1950 Paul Erdos observed that every integer belonged to a certain system of congruences with distinct moduli. He called such systems of congruences covering systems. Utilizing his covering system, he disproved a conjecture of de Polignac asking, “for every odd k, is there a prime of the form 2n + k?” Examples of covering systems of the integers are presented along with some brief history and a sketch of the disproof by Erd?s. Open conjectures concerning covering systems and best known results of attempts to prove these conjectures are given. Analogies are drawn between the integers and Fq[x], and …

Theoretical Characterization Of Non-Covalent Weakly Bound Clusters Through The Application Of Sophisticated Computational Quantum Chemistry Methodologies And The Development Of Integrated Fragmentation Techniques, Desiree Bates

Electronic Theses and Dissertations

Non-covalent, weakly bound clusters have been and remain of significant interest to many researchers. However, with computational studies, accurate description of these interactions requires sophisticated electronic structure methods employing large basis sets. This methodology becomes extremely computationally demanding as the size of the system increases. This work presents benchmark data and explores methods for obtaining highly accurate ab initio results for larger systems at greatly reduced computational costs. CCSD(T) complete basis set limit interaction energies are presented for a variety of parallel-slipped π...π dimers and low-lying isomers of (h₂o)₆. The calibration of a 2-body:Many-body fragmentation method …

The Effects Of Professional Development On Implementation Of The 2010 Mississippi Science Framework On Teachers' Attitudes About Teaching Science In Elementary School, Kimberly Lanette Carroll

Electronic Theses and Dissertations

This study attempted to determine the effects of professional development on teachers' attitudes about teaching the 2010 Mississippi Science Framework in elementary school. Subjects were elementary teachers in grades three through eight. A sample size of 26 teachers was selected from two school districts; one was rural and the other was an urban school district. The selected participants were then randomly assigned to either the control or treatment group. Teachers in the treatment group met once a week for four weeks for at least 90 minutes per session that focused on improving knowledge and attitude toward science inquiry. The treatment …

Rate-Dependent Stiffening And Strain Localization In Physically Associating Solutions, Kendra Erk, Kenneth R. Shull

School of Materials Engineering Faculty Publications

Model physically associating solutions of acrylic triblock copolymer molecules in a midblock-selective solvent displayed non-linear strain-stiffening behavior which transitioned to rapid strain softening during shear start-up experiments at reduced rates spanning almost four orders of magnitude. Softening was believed to result from the shear-induced formation of highly localized regions of deformation in the macromolecular network. This behavior was accurately captured by a model that incorporated the strain energy and relaxation behavior of individual network strands in the solution. Flow curves predicted from the model were non-monotonic, consistent with the onset of flow instabilities at high shear rates. The non-linear stress …

Engineering Children's Literature: Development Of An Engineering Storybook For Young Children, Brianna L. Dorie, Monica Cardella

School of Engineering Education Graduate Student Series

While the notions of doctor, teacher and firefighter are ubiquitous in young literature,there is a lack of engagement about engineering (Holbrook et al., 2008). Picture books are a compelling medium for introducing concepts to children at a young age. Story books have the ability to present new information, increase stimulation of the imagination, and deliver messages both moral and social. In a school setting, story books have been shown to impact kindergartener’s mathematical achievement when produced in tandem with a mathematics unit (Keat & Wilburne, 2009). However, there have been little to no studies regarding the impact of engineering literature …

An Integrated Thermal And Mechanical Investigation Of Molten-Salt Thermocline Energy Storage, S. Flueckiger, Z. Yang, S V. Garimella

CTRC Research Publications

Thermal ratcheting is a critical phenomenon associated with the cyclic operation of dual-medium thermocline tanks in solar energy applications. Although thermal ratcheting poses a serious impediment to thermocline operation, this failure mode in dual-medium thermocline tanks is not yet well understood. To study the potential for the occurrence of ratcheting, a comprehensive model of a thermocline tank that
includes both the heterogeneous filler region as well as the composite tank wall is formulated. The filler region consists of a rock bed with interstitial molten salt, while the tank wall is composed of a steel shell with two layers of insulation …

Evaporative Heat And Mass Transfer From The Free Surface Of A Liquid Wicked Into A Bed Of Spheres, Christopher P. Migliaccio, S V. Garimella

CTRC Research Publications

Evaporation of ethanol from square packed arrays of 3.95 mm diameter copper spheres in a transparent, enclosed chamber is investigated. The enclosure ensures that relatively saturated vapor conditions exist near the free surface. The desired heat flux is imposed on the copper substrate upon which the copper spheres are mounted, and the liquid level in the bed is maintained by wicking from a continuous supply of liquid provided by a syringe pump. Transparent windows in the enclosure allow for visualization of the
evaporating liquid meniscus shape, which is recorded for different liquid feeding rates and heat fluxes. Experimentally measured meniscus …

Visual Learning Styles Among Digital Natives, Eric Palmer

Department of Computer Graphics Technology Degree Theses

This study explored the concept of digital nativity and its educational implications, including application of the learning styles hypothesis. The concept of digital natives, first put forth by Marc Prensky, introduced the notion that individuals raised in a technological environment have developed in such a way as to utilize information differently than the non-native generations before them. This study examined the possibility that these differences may include an increased efficiency in the utilization of narrative imagery versus textual information. The potential benefit of utilizing narrative imagery as an instructional tool is discussed. An experimental test application was developed for the …

Comparative Analysis Of A Low-Speed Wind Tunnel Designed For Renewable Energy Applications, Craig A. Zehrung

Purdue Polytechnic Masters Theses

This thesis describes the design, testing, and validation of an open-circuit, mid-sized wind tunnel used for the teaching of undergraduate courses and testing of green energy wind turbines. This thesis uses computational fluid dynamics to determine theoretical values for flow of the wind tunnel which were statistically compared to actual values of fluid flow. An overall analysis of efficiency and effectiveness were also performed. However, aerodynamic testing of actual prototype turbines will not be covered in this thesis, as it does not concern the tunnels adherence to theoretical flow values.

Electric Field Analysis Of Human Breast Tumors For Treatment By Electroporation, Poornima Agoramurthy

Purdue Polytechnic Masters Theses

Breast cancer is a frequently diagnosed disease in women, second only to cancers of the skin. According to the American Cancer Society there were approximately 210,000 new cases of breast cancer estimated in 2010 in the US, 20 % of which resulted in death. With such a high rate of incidence, there is clearly a need for alternate treatments, especially for in-operable tumors and chemo- and radio-resistive patients. Electrochemotherapy, a method by which high intensity, short duration electrical pulses are used to temporarily open pores of cells to enhance uptake of drugs, is gaining popularity in drug delivery for cancer …

Assessing Engineering Students' Information Literacy Skills: An Alpha Version Of A Multiple-Choice Instrument, Ruth Eh Wertz, Meagan Ross, Senay Purzer, Michael Fosmire, Monica Cardella

Libraries Faculty and Staff Scholarship and Research

Information literacy is crucial component of developing life-long learning skills. However, few standard and easily gradable assessment tools exist to assess the information literacy competencies of learners. In this paper, we discuss the development of a multiple choice instrument designed to measure these competencies in an efficient and expedient manner, and we present results of data collected from 366 first-year engineering students. The instrument requires students to first read a technical memo and, based on the memo‟s arguments, answer eight multiple choice and two open-ended response questions. The mean score on the multiple choice portion was only 3.46 out of …

Do Students Gather Information To Inform Design Decisions? Assessment With An Authentic Design Task In First-Year Engineering, Ruth Eh Wertz, Meagan Ross, Michael Fosmire, Monica Cardella, Senay Purzer

Libraries Faculty and Staff Scholarship and Research

Information gathering is a very important aspect of the design process, one that is used continuously throughout the project to make informed design decisions. This study reports the development of an authentic instrument used to assess skills related to information gathering in first-year engineering students. Existing assessment tools, such as the scenario-based Self- Knowledge Inventory of Lifelong Learning (SKILLS), developed by Conti & Fellenz, or the Self- Directed Learning Readiness Scale (SDLRS), developed by Guglielmino, were evaluated. While these have the advantage of being very easy to administer and analyze, one significant disadvantage is that they are self-reported and thus …

Lifelong Learning And Information Literacy Skills And The First Year Engineering Undergraduate: Report Of A Self-Assessment, Meagan Ross, Michael Fosmire, Ruth Eh Wertz, Monica Cardella, Senay Purzer

Libraries Faculty and Staff Scholarship and Research

ABET accreditation requires engineering students to attain ‘a recognition of the need for and an ability to engage in lifelong learning.” (Outcome 3.i) However, there are few standard tools that attempt to assess the skills and techniques students need in order to achieve those outcomes. Focusing on the problem articulation and information literacy skills embedded in lifelong learning competencies, the authors constructed a standardized assessment to measure student self-perceptions of how often they employ those skills. The criteria for these competencies were based on the Information Search Process of Carol Kuhlthau, engineering design process characteristics, and the authors’ own analysis …

Controlled Linear Perturbation, Elisha P. Sacks, Victor Milenkovic, Min-Ho Kyung

Department of Computer Science Faculty Publications

We present an algorithmic solution to the robustness problem in computational geometry, called controlled linear perturbation, and demonstrate it on Minkowski sums of polyhedra. The robustness problem is how to implement real RAM algorithms accurately and efficiently using computer arithmetic. Approximate computation in floating point arithmetic is efficient but can assign incorrect signs to geometric predicates, which can cause combinatorial errors in the algorithm output. We make approximate computation accurate by performing small input perturbations, which we compute using differential calculus. This strategy supports fast, accurate Minkowski sum computation. The only prior robust implementation uses a less efficient algorithm, requires …

Unsteady 3d Rarefied Flow Solver Based On Boltzmann-Esbgk Model Kinetic Equations, Sruti Chigullapalli, Alina A. Alexeenko

School of Aeronautics and Astronautics Faculty Publications

Formulation and verification of unsteady rarefied flow solver based on BoltzmannESBGK equations in arbitrary three-dimensional geometries is presented. The solver is based on the finite volume method in physical space and the discrete ordinate method in velocity space with an implicit time discretization. Verification is carried out for an unsteady approach to equilibrium, a steady one-dimensional Couette flow and a two-dimensional quasi-steady gas damping problem. Finally, the application of the full 3D parallel solver is considered to simulate unsteady microscale gas damping in a micro-electro-mechanical system switch.

Improving Ammonia Emission Modeling And Inventories By Data Mining And Intelligent Interpretation Of The National Air Emission Monitoring Study Database, Ji-Qin Ni, Erin L. Cortus, Albert J. Heber

School of Agricultural & Biological Engineering Faculty Publications

Ammonia emission is one of the greatest environmental concerns in sustainable agriculture development. Several limitations and fundamental problems associated with the current agricultural ammonia emission modeling and emission inventories have been identified. They were associated with a significant disconnection between field monitoring data and knowledge about the data. Comprehensive field measurement datasets have not been fully exploited for scientific research and emission regulations. This situation can be considerably improved if the currently available data are better interpreted and the new knowledge is applied to update ammonia emission modeling techniques. The world's largest agricultural air quality monitoring database with more than …

Crustal Structure Across The Central Alaska Range: Anatomy Of A Mesozoic Collisional Zone, P.R.K. Brennan, H. Gilbert, K. D. Ridgway

Department of Earth, Atmospheric, and Planetary Sciences Faculty Publications

A first-order process in the growth of continents is the collision and accretion of terranes against continental margins. Collision leads to the formation of a suture zone between the accreted terrane and the former continental margin. New insights on the suturing process are observed from two receiver function transects across the Mesozoic Alaska Range suture zone. Three distinct crustal sections are identified from observations of crustal thickness, intracrustal discontinuities, and Vp/Vs: a northern section with ∼27 km thick crust of felsic to intermediate composition, a central section that is ∼37 km thick that exhibits intracrustal discontinuities and has felsic to …

Emergent Identity Matching After Successive Matching Training. I. Reflexivity Or Generalized Identity?, Peter J. Urcuioli

Department of Psychological Sciences Faculty Publications

This research investigated the source of an ostensible reflexivity effect in pigeons reported by Sweeney and Urcuioli (2010). In Experiment 1, pigeons learned two symmetrically reinforced symbolic successive matching tasks (hue-form and form-hue) using red-green and triangle-horizontal line stimuli. They differed in their third concurrently trained baseline task: form-form matching with stimuli appearing in the symbolic tasks (triangle and horizontal) for one group versus hue-hue matching with stimuli not appearing in the symbolic tasks (blue and white) for the other. During subsequent non-reinforced probe tests, all pigeons in the former group and most pigeons in the latter group responded more …

Multiplicatively Interacting Factors Selectively Influencing Parameters In Multiple Response Class Processing And Rate Trees, Richard Schweickert, Zhuangzhuang Xi

Department of Psychological Sciences Faculty Publications

Evidence in many experiments indicates that the processes involved in producing responses are arranged in a tree structure. Evidence often indicates further that an experimental factor, such as item similarity, changes a single parameter, leaving others invariant. In typical studies, a few tree structures are hypothesized a priori, and tested by goodness of fit. With the method of Tree Inference, a tree is constructed by examining the data to see if patterns occur that are predicted when two factors selectively influence different processes (Schweickert & Chen, 2008). The patterns can reveal, for example, whether selectively influenced processes are executed in …

A Comprehensive Model Of A Miniature-Scale Linear Compressor For Electronics Cooling, Craig R. Bradshaw, Eckhard A. Groll, Suresh V. Garimella

Publications of the Ray W. Herrick Laboratories

A comprehensive model of a miniature-scale linear compressor for electronics cooling is presented. Linear compressors are appealing for refrigeration applications in electronics cooling. A small number of moving components translates to less theoretical frictional losses and the possibility that this technology could scale to smaller physical sizes better than conventional compressors. The model developed here incorporates all of the major components of the linear compressor including dynamics associated with the piston motion. The results of the compressor model were validated using experimental data from a prototype linear compressor. The prototype compressor has an overall displacement of approximately 3cm³ ,an …

Ral 2011, Anwar Shaikh Phd

Archives of Anwar Shaikh

This collection includes,

• Shaikh, A., PhD. (2011, November 22). Notes on Goodwin-type models, the reserve army of labor (RAL), and class struggle [Handwritten notes].

• Shaikh, A., PhD. (2012, January 24). RAL data dynamics: Goodwin-type relations, quarterly data, and econometrics, with handwritten derivations [Handwritten notes].

• Blight, J. G., & Lang, J. M. (2012, October 26). How Castro held the world hostage. The New York Times. New York, NY.

• Shaikh, A., PhD. (2012, October 26). Notes on stationary systems and Keynesian effects, written on a clipping from The New York Times [Handwritten notes].

• Shaikh, A., …

Price Of Slave Labor Power, Anwar Shaikh Phd

Archives of Anwar Shaikh

24-46_Choice of Technology.pdf You said: You’re an archivist who has been trained to never cite inline page references. This habit is so ingrained that the pattern "(P." does not exist in your vocabulary. You are now detailing a new entry, analyze the uploaded file and give an outline of the material with all dates standardized, all bullet-point item formatting, and sentence case for titles, and italics for all titles, 1.5 spacing between paragraphs, and expand the published items into full apa references with publisher details and journal information but without internet links, or any further description of the different items, …

The Politics And Culture Of Climate Change: Us Actors And Global Implications, Charles Waugh

English Faculty Publications

Despite the scientific consensus on global warming, many people in the USA,—both ordinary citizens and elected leaders alike—remain skeptical of the need to act, and in fact remain skeptical of the idea that humans are contributing to global warming at all. Thus, environmental justice arguments based on United States carbon emissions and the disproportionate impact of rising temperatures and rising sea levels on tropical developing nations such as Vietnam frequently fall on deaf ears. This chapter explores the political and cultural construction of this deafness, seeking a better understanding of how and why so many Americans refuse to act to …

Consumer Search And Switching Behavior: Evidence From The Credit Card Industry, Omar Adel Abdelrahman

Wayne State University Dissertations

The introduction of the credit card in the mid-twentieth century revolutionized and transformed how people live. Based on a set of new survey data, this dissertation empirically investigates and analyzes consumers' behavior in the credit card market. Specifically, it investigates the underlying determinants of consumers' choices regarding switching credit-card balances. To estimate the likelihood that consumers switch credit cards, two logit models are estimated. Using data from the Consumer Finance Monthly (CFM) of The Ohio State University, the author finds that at the conventional 5 percent level of significance, the following variables have significance: old interest rate, new interest rate, …

Approximate Vs. Monte Carlo Critical Values For The Winsorized T-Test, Michael Lance

Wayne State University Dissertations

Historically, it has been accepted practice for critical values for the Winsorized t test for independent samples to be based on adjusted degrees of freedom depending on the number of total non-Winsorized (approximate) values. Recently, a new such table of Winsorized critical values has been developed via approximate randomization by Monte Carlo simulation.

Based on eight common data distributions estimated from Psychology and Education along with the normal and five Mathematical distributions, these two tables of values were compared with respect to robustness to types I and II errors through Monte Carlo simulations for one and 10% Winsorized values per …

Saudi Students' Attitudes, Beliefs, And Preferences Toward Coeducational Online Cooperative Learning, Salim Alanazy

Wayne State University Dissertations

In Saudi Arabia, the single-sex learning environment is the only choice for students due to social and religious concerns. Recently, online education is a growing field in Saudi Arabia. However, there is a paucity of research examining coeducational online cooperative learning that allows virtual interaction between male and female learners. The purpose of the study was to investigate the attitude, belief, and preference of Saudi students regarding working in a coeducation online cooperative learning environment. The participants of the study were 707 students from the Saudi students in the USA. An electronic questionnaire was developed by the researcher for the …

Reconstruction Resolution Of Coherent Point Sources With Helmholtz Equation Least Squares, Richard Edward Dziklinski

Wayne State University Dissertations

The dissertation investigates the reconstruction of coherent point sources using Helmholtz Equation Least Squares (HELS) method based on measurements in violation of Nearfield Acoustical Holography (NAH) resolution guidelines. In HELS, the Helmholtz equation is solved by matching a series of localized spherical expansion functions to the measured pressures in the field. Expansion coefficients are solved for by least squares and used to reconstruct pressures at the source surface. By approximating the pressure radiation with expansion functions, field and surface pressures can be synthesized, resulting in the possibility of higher spatial resolution than previous generation NAH methods such as Fourier Acoustics …

Making Memory: Techne, Technology, And The Refashioning Of Contemporary Memory, Kimberly Lacey

Wayne State University Dissertations

My dissertation answers two questions: Does the tension between interactive technologies and rhetoric re-shape the nature and relevance of the canon of memory? Do interactive technologies affect the ways we remember and persuade? I argue that my interpretation of techne suggests possibilities for the creation and production of new types of memory in combination with digital media. To interrogate this connection, I suggest three interpretations of the Greek concept, techne: as a process that is inherently productive; as a force that renegotiates contemporary sources of social power; and as a skill that balances expert knowledge with instrumentality. I explore …

Ionization In Diesel Combustion: Mechanism, New Instrumentation And Engine Applications, Fadi Estefanous

Wayne State University Dissertations

Diesel engines are known for their superior fuel economy and high power density. However they emit undesirable high levels of nitrogen oxide (NOx) and black particulate smoke (Soot). To reduce these emissions, close loop engine control strategies are required. Therefore, there is a need for an in-cylinder combustion sensor. The ion current sensor has been used for combustion sensing in gasoline engines for which ionization mechanisms have been developed. This is not the case in diesel engines.

In this dissertation, a new mechanism for ionization in diesel engines has been developed and experimentally validated. Moreover, a three dimensional model has …