Digital Commons Network^™

Design And Analysis Of An R-Shaped Dual-Band Planar Inverted-F Antenna For Vehicular Applications, Mohammod Ali, Guangli Yang, Huan-Sheng Hwang, Tuangsit Sittironnarit

Faculty Publications

A dual-band R-shaped planar inverted-F antenna is proposed for vehicular application. Utilization of this unique geometry dual-frequency operation is achieved with a single feed. The proposed antenna operates in the 225- and 450-MHz bands. Input impedance and return loss data as function of various antenna parameters are presented, which show that parameters can be adjusted in order to obtain optimum tuning. Radiation pattern data for the antenna mounted on the roof of two types of vehicles are given. The pattern in the low-frequency band is essentially omnidirectional while that in the high-frequency band is directional and normal to the antenna …

International Decision: United States--Continued Dumping And Subsidy Offset Act Of 2000, Mark L. Movsesian

Faculty Publications

This brief article is a report of an international decision of the World Trade Organization Appellate Body on January 16, 2003, concerning the United States’ Continued Dumping and Subsidy Offset Act of 2000 (WT/DS217 & 234/AB/R). Eleven WTO members—Australia, Brazil, Canada, Chile, the European Communities, India, Indonesia, Japan, Korea, Mexico, and Thailand—filed a challenge to the Byrd Amendment in the summer of 2001. A WTO dispute settlement panel, agreeing with the complaining parties, made two major findings. First, the panel concluded that the Byrd Amendment constitutes an impermissible specific action against dumping and subsidization under the Antidumping and SCM Agreements. …

Muscular Fitness And All-Cause Mortality: Prospective Observations, Shannon J. Fitzgerald, Carolyn E. Barlow, James B. Kampert, James R. Morrow Jr., Allen W. Jackson, Steven N. Blair

Faculty Publications

Background: The beneficial effects of cardiorespiratory fitness on mortality are well known; however, the relation of muscular fitness, specifically muscular strength and endurance, to mortality risk has not been thoroughly examined. The purpose of the current study is to determine if a dose-response relation exists between muscular fitness and mortality after controlling for factors such as age and cardiorespiratory fitness.

Methods: The study included 9105 men and women, 20-82 years of age, in the Aerobics Center Longitudinal Study who have completed at least one medical examination at the Cooper Clinic in Dallas, TX between 1981 and 1989. The exam included …

Exploration Of Artificial Multiferroic Thin-Film Heterostructures Using Composition Spreads, K.-S. Chang, M. A. Aronova, C.-L. Lin, M. Murakami, M.-H. Yu, Jason R. Hattrick-Simpers, O. O. Famodu, S. Y. Lee, R. Ramesh, M. Wuttig, I. Takeuchi, C. Gao, L. A. Bendersky

Faculty Publications

We have fabricated a series of composition spreads consisting of ferroelectric BaTiO₃ and piezomagnetic CoFe₂O₄ layers of varying thicknesses modulated at nanometer level in order to explore artificial magnetoelectricthin-film heterostructures. Scanning microwavemicroscopy and scanning superconducting quantum interference device microscopy were used to map the dielectric and magnetic properties as a function of continuously changing average composition across the spreads, respectively. Compositions in the middle of the spreads were found to exhibit ferromagnetism while displaying a dielectric constant as high as ≈120.

Series Solution To The Transient Convective Diffusion Equation For A Rotating Disk Electrode, Shiriram Santhanagopalan, Ralph E. White

Faculty Publications

A series solution to the transient convective diffusion equation for the rotating disc electrode system is presented and compared to previously reported solutions. The solution presented here is for the entire time domain and agrees well with both the short and long time solutions presented earlier in the literature.

Parameter Estimates For A Pemfc Cathode, Qingzhi Guo, Vijay A. Sethuraman, Ralph E. White

Faculty Publications

Five parameters of a model of a polymer electrolyte membrane fuel cell (PEMFC) cathode (the volume fraction of gas pores in the gas diffusion layer, the volume fraction of gas pores in the catalyst layer, the exchange current density of the oxygen reduction reaction, the effective ionic conductivity of the electrolyte, and the ratio of the effective diffusion coefficient of oxygen in a flooded spherical agglomerate particle to the square of that particle radius) were determined by least-squares fitting of experimental polarization curves. The values of parameters obtained in this work indicate that ionic conduction and gas-phase transport are two …

Analytical Solution For The Impedance Of A Porous Electrode, Sheba Devan, Venkat R. Subramanian, Ralph E. White

Faculty Publications

A macrohomogeneous model is presented for a porous electrode that includes coupled potential and concentration gradients with linear kinetics. The equations are solved to obtain an analytical expression for the impedance of a porous electrode. Complex plane plots are presented that illustrate two well-defined arcs: a kinetic arc and a diffusion arc with their time constants far apart. The effects of parameters such as exchange current density, porosity, diffusion coefficient, thickness, and interfacial area on the impedance spectra are presented. The usefulness of the analytical solution in investigating the effect of solution phase diffusion is also presented.

A Steady-State Impedance Model For A Pemfc Cathode, Qingzhi Guo, Ralph E. White

Faculty Publications

A model for the simulation of the steady-state impedance response of a polymer electrolyte membrane fuel cell (PEMFC) cathode is presented. The catalyst layer of the electrode is assumed to consist of many flooded spherical agglomerate particles surrounded by a small volume fraction of gas pores. Stefan-Maxwell equations are used to describe the multicomponent gas-phase transport occurring in both the gas diffusion layer and the catalyst layer of the electrode. Liquid-phase diffusion of O2 is assumed to take place in the flooded agglomerate particles. Newman’s porous electrode theory is applied to determine over-potential distributions. © 2004 The Electrochemical Society. All …

Cycle Life Modeling Of Lithium-Ion Batteries, Gang Ning, Branko N. Popov

Faculty Publications

A first-principles-based charge-discharge model was developed to simulate the capacity fade of Li-ion batteries. The model is based on the loss of active lithium ions due to solvent reduction reaction and on the rise of the anode film resistance. The effect of parameters such as exchange current density, depth of discharge (DOD), end of charge voltage, film resistance, and the overvoltage of parasitic reaction were studied quantitatively. The model controls the required DOD by controlling the discharge time and estimates the end of discharge voltages as a function of cycle number.

Development Of First Principles Capacity Fade Model For Li-Ion Cells, P. Ramadass, Bala Haran, Parthasarathy M. Gomadam, Ralph E. White, Branko N. Popov

Faculty Publications

A first principles-based model has been developed to simulate the capacity fade of Li-ion batteries. Incorporation of a continuous occurrence of the solvent reduction reaction during constant current and constant voltage (CC-CV) charging explains the capacity fade of the battery. The effect of parameters such as end of charge voltage and depth of discharge, the film resistance, the exchange current density, and the over voltage of the parasitic reaction on the capacity fade and battery performance were studied qualitatively. The parameters that were updated for every cycle as a result of the side reaction were state-of-charge of the electrode materials …

Development Of Novel Method For Preparation Of Pemfc Electrodes, Hansung Kim, Branko N. Popov

Faculty Publications

A method based on pulse electrodeposition technique was developed for preparation of membrane electrode assemblies (MEAs). In this approach, platinum is deposited directly on the surface of the carbon electrode. The method ensures most of the platinum to be in close contact with the membrane. Using this method it is possible to increase the Pt/C ratio up to 75 wt % near the surface of the electrode resulting in a 5 µm thick catalyst layer. The MEA prepared by pulse electrodeposition exhibits a current density of 0.33 A/cm² at 0.8 V with platinum loading of 0.25 mg of Pt/cm …

Solvent Diffusion Model For Aging Of Lithium-Ion Battery Cells, Harry J. Ploehn, Premanand Ramadass, Ralph E. White

Faculty Publications

This work presents a rigorous continuum mechanics model of solvent diffusion describing the growth of solid-electrolyte interfaces (SEIs) in Li-ion cells incorporating carbon anodes. The model assumes that a reactive solvent component diffuses through the SEI and undergoes two-electron reduction at the carbon-SEI interface. Solvent reduction produces an insoluble product, resulting in increasing SEI thickness. The model predicts that the SEI thickness increases linearly with the square root of time. Experimental data from the literature for capacity loss in two types of prototype Li-ion cells validates the solvent diffusion model. We use the model to estimate SEI thickness and extract …

International Service Under The Hague Convention, W. Mark C. Weidemaier

Faculty Publications

No abstract provided.

The Transnational And Sub-National In Global Crimes, Lan Cao

Faculty Publications

No abstract provided.

Embodied Perceptual Practices: Towards An Embrained And Embodied Model Of Mind For Use In Actor Training And Rehearsal, Shannon Rose Riley

Faculty Publications

No abstract provided.

President's Page, Samantha K. Hastings

Faculty Publications

No abstract provided.

A Re-Examination Of The Structure And Content Of Confucius’S Version Of The Golden Rule, Bo Mou

Faculty Publications

No abstract provided.

In Memoriam: Jerry Phillips: A Scholar & A Gentleman, Elizabeth Price Foley, Elizabeth C. Price

Faculty Publications

No abstract provided.

Constitutional Theory In A Nutshell, Thomas E. Baker

Faculty Publications

This article provides a nutshell description of the leading theories and identifies some of the leading theorists on the Constitution. The unit of currency here is the academic law review article, not the Supreme Court decision. The citations here provide illustrative examples of the vast body of literature. The discussion provides preliminary sketches of an intellectual landscape that is vast and often foreboding to the beginner. This article is organized around three basic interpretative questions: Who has the authority to interpret the Constitution? What are the legitimate sources of meaning for interpreting the Constitution? How is the Constitution interpreted within …

Jose Marti And The Call Of Technology In "Amor De Ciudad Grande", David Laraway

Faculty Publications

Sometime in November of 1883, readers of the Spanish-language periodical La Ameica opened their paper to discover that a fantastic-sounding invention had recently been unveiled at a technology exposition in Vienna. "Es un aparatillo ingeniosisimo," exclaimed Jos6 Marti, a correspondent for the paper:

Puesto en lo interior de la boca [...] reproduce [el habla] sobre el papel con perfecci6n de escribiente del siglo XV. S6lo exige que se pronuncie con toda claridad; y cada silaba, al punto que es pronunciada, ya es colocada sobre el papel que la espera, sin molestia alguna para el que habla; y sin confusi6n para …

Termination-Dependent Diversity Performance Of Coupled Antennas: Network Theory Analysis, Michael A. Jensen, Jon W. Wallace

Faculty Publications

A new analysis of mutually coupled diversity antenna systems is presented that includes the effects of coupling on the radiation pattern and received power. This analysis, based upon the network scattering parameters, makes use of the singular value decomposition to both specify the characteristics of and analyze terminated antenna networks. The approach facilitates a simplified proof of the multiport conjugate matching condition as well as development of expressions for diversity performance as a function of various impedance terminations. Application of the analysis to coupled dipole antennas characterized using full-wave electromagnetic analysis leads to a comprehensive examination of the diversity performance …

Fast Registration Of Tabular Document Images Using The Fourier-Mellin Transform, William A. Barrett, Luke A. D. Hutchison

Faculty Publications

A new technique is presented for quickly identifying global affine transformations applied to tabular document images, and to correct for those transformations. This technique, based on the Fourier-Mellin transform, is used to register (align) a set of tabular documents to each other. Each component of the affine transform is handled separately, which dramatically reduces the total parameter space of the problem. This method is robust, and deals with all components of the affine transform in a uniform way. The Fourier-Mellin transform is also extended to handle shear, which can approximate a small amount of perspective distortion, and to not need …

Jesse Knight And His Humbug Mine, J. Michael Hunter

Faculty Publications

Born in Nauvoo, Illinois to faithful Mormon parents, Jesse Knight later withdrew from activity in The Church of Jesus Christ of Latter-day Saints (LDS Church). In this biographical sketch, the events associated with his “religious awakening” are recounted, as are the circumstances that led to his amassing a fortune in the mining industry. Considering his wealth to be a stewardship from the Lord, he used it to create jobs for the unemployed, promote education, encourage wholesome recreation, and save the credit of the LDS Church. “Uncle Jesse” was an example of kindness and generosity to all.

Multiple Domains Of The Co-Chaperone Hop Are Important For Hsp70 Binding, Gregory M. Nelson, Patricia E. Carrigan, Patricia J. Roberts, Jha'nae Stoffer, Daniel L. Riggs, David F. Smith

Faculty Publications

The Hop/Sti1 co-chaperone binds to both Hsp70 and Hsp90. Biochemical and co-crystallographic studies have suggested that the EEVD-containing C terminus of Hsp70 or Hsp90 binds specifically to one of the Hop tetratricopeptide repeat domains, TPR1 or TPR2a, respectively. Mutational analyses of Hsp70 and Hop were undertaken to better characterize interactions between the C terminus of Hsp70 and Hop domains. Surprisingly, truncation of EEVD plus as many as 34 additional amino acids from the Hsp70 C terminus did not reduce the ability of Hsp70 mutants to co-immunoprecipitate with Hop, although further truncation eliminated Hop binding. Hop point mutations targeting a carboxylate …

Motivating Undergraduate Feedback Control Through Robot Soccer, Randal Beard

Faculty Publications

One of the challenges in control engineering education is to motivate students to invest the effort necessary to understand the theoretical foundations of feedback control. We have found that many students are inherently interested in robotics and are attracted to control engineering when they understand that it plays a central role in robotic systems. To capitalize on this appeal, we have established a one semester robot soccer senior design course that uses the undergraduate feedback control course to introduce the prerequisite material. As a consequence, the undergraduate feedback control course and its lab have been redesigned to focus on mobile …

Resolving Automatic Prepositional Phrase Attachments By Non-Statistical Means, Deryle W. Lonsdale, Michael B. Manookin

Faculty Publications

Prepositional-phrase attachment is a topic of active research in the field of computational linguistics. Properly attaching prepositional phrases to their pertinent constituent proves straightforward for humans, but inferring these attachments in a cognitive modeling system becomes difficult. For example, in the sentence, ‘Ralph threw the frisbee to John,’ the prepositional phrase ‘to John’ will attach to the verb phrase ‘threw’. In another example, ‘Joe saw the dog with fur,’ the prepositional phrase ‘with fur’ will attach directly to the noun phrase ‘the dog.’ Humans would have little difficulty resolving these examples, but for computers this would be difficult.

A Computational Approach To Resolving Certain Issues In Spanish Stress Placement, David Eddington

Faculty Publications

Previous research into Spanish stress assignment suggests that accentuation involves learning and storing individual word tokens along with their inherent stress patterns, and analogizing on stored words when the need arises to determine the stress pattern of an unknown or unavailable word. Exactly what variables are most relevant to stress assignment has been hotly debated. In the present study, a number of analogical simulations were carried out to determine whether elements of the CV tier, syllable weight, phonemic representation, or a combination of these, best accounts for accentuation in Spanish.

Connections Between Teacher And Student Attitudes Regarding Script Choice In First-Year Japanese Language Classrooms, Dan Dewey

Faculty Publications

This study investigates connections between teacher and student attitudes related to the delayed (or immediate) introduction of Japanese script in the Japanese language classroom. Two groups of students completed questionnaires concerning their attitudes toward the immediate or delayed introduction of Japanese script and the use of romaji (romanized Japanese) in the Japanese as a second language classroom. The first group was introduced to Japanese script immediately, and romaji was not used in their textbook. The second group used a romaji textbook and was introduced toJapanese script at a later time and a slower rate. Teacher attitudes were also assessed using …

A Comparison Of Reading Development By Learners Of Japanese In Intensive Domestic Immersion And Study Abroad Contexts, Dan Dewey

Faculty Publications

To investigate the role of context in reading development, a comparison of reading comprehension and processes was conducted between learners of Japanese as a second language in study abroad (SA; n = 15) and intensive domestic (in the United States) immersion (IM; n = 15) contexts. A significant difference was found between contexts in pretest to posttest gains on only one measure of reading comprehension, a self-assessment. Differences on the two other measures of comprehension—free-recall and vocabulary knowledge—were not significant. The self-assessment measure indicated that SA students felt more confident reading the second language than their IM counterparts. In terms …

Why Do Auditors Over-Rely On Weak Analytical Procedures? The Role Of Outcome And Insensitivity To Precision, Steven M. Glover, Douglas F. Prawitt, T. Jeffrey Wilks

Faculty Publications

Recent evidence from highly publicized frauds and from the Public Oversight Board’s Panel on Audit Effectiveness (2000) indicates that auditors sometimes over-rely on weak evidence supporting a clean audit opinion. In experiment 1 we examine whether a favorable outcome, together with insensitivity to factors relating to the strength of evidence, could lead to over-reliance on weak substantive procedures. In experiment 2 we examine whether an explicit ex ante prompt can sensitize auditors to the weaknesses of an unreliable substantive procedure. Our examination is conducted in the context of substantive analytical procedures that are performed to provide evidence during the substantive …