Digital Commons Network^™

Diffusion Of Water In Nafion 115 Membranes, Sathya Motupally, Aaron J. Becker, John W. Weidner

Faculty Publications

In this paper, experimental and simulated data for the diffusion of water across Nafion membranes as a function of the water activity gradient are presented. The gradient in the activity of water across the membrane was varied by changing the flow rate and pressure of nitrogen gas on one side of the membrane. The other side of the membrane was equilibrated with liquid water. It was found that the model predictions are very sensitive to the value of the diffusion coefficient of water in Nafion. Using the Fickian diffusion coefficient extracted from self-diffusion measurements reported in the literature, the model …

Modeling The Effects Of Ion Association On Direct-Current Polarization Of Solid Polymer Electrolytes, Changqing Lin, Ralph E. White, Harry J. Ploehn

Faculty Publications

Considerable experimental evidence indicates that ion association occurs in solid polymer electrolytes. This work provides a thorough theoretical analysis of the effect of ion association on the conductivity, general current-potential behavior, and limiting current density in a solid polymer electrolyte. The model employs dilute solution theory to describe the fluxes of cations, anions, and ion pairs in a motionless continuum but neglects higher order association. The predictions of the model highlight the effects of the relative diffusion coefficients and dimensionless association constant on concentration distributions of simple ions and ion pairs, the limiting current density, and the potential drop required …

Oxygen Diffusion Coefficient And Solubility In A New Proton Exchange Membrane, Andrew T. Haug, Ralph E. White

Faculty Publications

No abstract provided.

Self‐Discharge Model Of A Nickel‐Hydrogen Cell, B. Wu, Ralph E. White

Faculty Publications

No abstract provided.

The World Trade Constitution, John O. Mcginnis, Mark L. Movsesian

Faculty Publications

Conventional wisdom holds that the World Trade Organization (WTO) necessarily poses a threat to sovereignty and representative government within its member nations. Professors McGinnis and Movsesian refute this view. They argue that the WTO can be understood as a constitutive structure that, by reducing the power of protectionist interest groups, can simultaneously promote international trade and domestic democracy. Indeed, in promoting both free trade and accountable government, the WTO reflects many of the insights that inform our own Madisonian Constitution. Professors McGinnis and Movsesian reject recent proposals to grant the WTO regulatory authority, endorsing instead the WTO's limited adjudicative power …

American Lawyers And International Competence, Charlotte Ku, Christopher J. Borgen

Faculty Publications

Just over ten years ago, Germans tore down a wall that divided their country and the whole of Europe. Stepping through the hole in the Berlin Wall, they took the first steps towards the reunification of West and East Germany and the end of the Cold War. Today another wall is being torn down—that between purely domestic law and international law. Companies are engaged in international trade at ever increasing rates. Environmental degradation has proved to be a global problem that cannot be solved with uncoordinated local measures. Individuals worldwide are pressing their governments for the recognition of a common …

"Working" With The Ada's "Regarded As" Definition Of A Disability, Thomas Simmons

Faculty Publications

The Americans with Disabilities Act of 1990 prohibits discrimination against and mandates accommodations for individuals with disabilities. As a threshold matter, the Act requires the plaintiff to demonstrate that she is an individual with a disability; that is, that she has an actual disability or is "regarded as" having a disability as the statute defines it. This article discusses the threshold "regarded as" showing as refined by three Supreme Court cases decided in the summer of 1999. Although in the past the "regarded as" definition has often played "second fiddle" to the "actual disability" definition, the author suggests that there …

An Agent-Based Global Economy, Michael N. Huhns

Faculty Publications

Many people are buying music CDs over the Web, but with multiple retail sites offering the same CDs, how do you decide which retailer to buy from? Typically, you visit a few sites and choose the one with the lowest price. Shopbotsshopping agents that automatically search the Internet to obtain information about prices and other attributes of goods and servicesare ideal helpers for such a task.1 The better ones can visit hundreds of sites, giving price-conscious consumers a powerful tool that could work to the detriment of some retailers.

The Emergence Of Language Among Autonomous Agents, Piotr Gmytrasiewicz, Michael N. Huhns

Faculty Publications

Suppose some autonomous shopbot agents had been representing us by dealing with a vendor's pricebot, and suppose they didn't share an agent communication language (ACL). What should they know at a fundamental level, what could each point to, and how could they establish a common language? Recent research at the University of Texas at Arlington has shown that agents first establish a common vocabulary, progress to a primitive language similar to human pidgin, then enrich the language's grammar to develop a creole, and eventually arrive at a full-blown ACL. During this process, the vocabulary and grammatical structures most important to …

Sensors + Agents + Networks = Aware Agents, Michael N. Huhns, Sreenath Seshadri

Faculty Publications

Software agents are being deployed in increasing numbers to help users find and manage information, particularly in open environments such as the Internet. For the most part, they operate independently and are typically designed to be aware only of their users and the environment in which they perform their tasks. Thus, they fail to take advantage of each other's abilities or results. For example, a shopping agent might periodically access several online databases to find the best price for a music CD and then purchase it if the price falls below its user's threshold. Other agents might be tracking prices …

Agent Teams: Building And Implementing Software, Michael N. Huhns

Faculty Publications

Agents will become fundamental building blocks for general-purpose Internet-based software. The software may not display any explicitly agent-like characteristics, but it will exhibit the benefits of tolerance to errors, ease of maintenance, adaptability to change, and speed of construction that agents provide. Moreover, an agent-based approach to software development can lead to new types of software solutions that might not otherwise be obvious. The author considers how an approach based on teams of active, cooperative, and persistent software components, that is agents, shows special promise in enabling the rapid construction of robust and reusable software.

An Empirical Study Of Sample-Selection Bias In Indices Of Commercial Real Estate, Henry J. Munneke, Barrett A. Slade

Faculty Publications

Real estate price indices based solely on samples of sold properties may not accurately represent the population of properties due to potential sample-selection bias. This study addresses this potential for sample-selection bias in the construction of commercial price indices within the context of the Phoenix area of®ce market. The empirical analysis con®rms the presence of sample-selection bias in the estimation of the total price equation. However, within this sample, the price indices generated after correcting for sample-selection bias do not appear signi®cantly different from those that do not consider selectivity bias.

Starting With Dora V: A Genealogy Of Ya Literature Specialists, Chris Crowe

Faculty Publications

This is another of those Year 2000 articles, but instead of gazing into my crystal ball to predict what the future of YA literature will be, I'm looking backward, tracing the genealogy of the people who established, refined, defended, and maintained the study of literature for adolescents.

When I was a graduate student at Arizona State University in 1982, I enrolled in Ken Donelson's adolescent literature course. I had met Donelson a few times before, and, frankly, he intimidated me. I was a lowly high school English teacher, and he was coeditor of English Joumal and one of the Big …

Modeling Nitrogen Evolution During Coal Pyrolysis Based On A Global Free-Radical Mechanism, Steven T. Perry, Thomas H. Fletcher

Faculty Publications

A global free-radical mechanism and an associated rate equation for the evolution of light gas nitrogen during coal devolatilization are presented. The light gas nitrogen rate equation was used to modify an existing nitrogen model so that only a network devolatilization model and coal-specific chemical structural input data are required to adequately predict light gas nitrogen release at a variety of pyrolysis conditions. Model predictions show good agreement with nitrogen release data from pyrolysis of coals of rank from lignite to low volatile bituminous at heating rates from 0.5 to 10⁵ K/s, temperatures as high as 2300 K, and …

Fronting And Palatalization In Two Dialects Of Shoshoni, Dirk Elzinga

Faculty Publications

In Western Shoshoni, a Uto- Aztecan language spoken in northern Nevada, coronal obstruents are found in distributional patterns which depend on the presence or absence of a preceding front vowel ([i] or [e]). In the pattern I refer to as FRONTING, alveolar stops alternate with dental stops - dental stops occur following front vowels (la), while alveolar stops occur elsewhere (lb); this pattern is common to all dialects:

Empirical Implications Of Title I, Michael Ashley Stein

Faculty Publications

No abstract provided.

Book Review Of Private Law And Social Inequality In The Industrial Age, Michael Ashley Stein

Faculty Publications

No abstract provided.

On Children And Dual Nationality: Sabet And The Islamic Republic Of Iran, Nancy Amoury Combs

Faculty Publications

The Iran-United States Claims Tribunal's recent decision in Sabet and The Islamic Republic of Iran sheds new light on difficult issues concerning the dual nationality of minors. In particular, the case was the first in which the Tribunal determined minor dual national claimants to have a dominant and effective nationality different from that of either of their parents. Further, the Tribunal broke new ground in its analysis of 'the caveat,' an equitable doctrine that can bar the claims of dual nationals. This article applauds the Tribunal's advances in its caveat jurisprudence and develops a new approach that would further those …

Antitrust Immunity, The First Amendment & Settlements: Defining The Boundaries Of The Right To Petition, Raymond Shih Ray Ku

Faculty Publications

Specifically, this Article examines whether settlement agreements and consent decrees resulting from what would otherwise be immunized litigation are protected from antitrust scrutiny and liability under Noerr. In order to conduct this analysis, this Article develops a methodology for determining immunity by focusing the immunity examination upon the means used to petition government and the source of the alleged injuries. Ultimately, private conduct is immune from antitrust scrutiny when it represents a valid attempt to persuade an independent governmental decision-maker in an effort to solicit government action, and the alleged injuries result from that persuasive effort. The validity of any …

Two Degrees Of Speech Protection: Free Speech Through The Prism Of Agricultural Disparagement Laws, Howard M. Wasserman

Faculty Publications

In the wake of a 1989 national television broadcast reporting the alleged cancer risk of a chemical applied to apples on trees, many states passed agricultural product disparagement (APD) statutes. These statutes grant civil causes of action to the growers and sellers of perishable food products, against anyone who speaks negatively or disparagingly, without basis in scientific evidence, about the product's safety. In this Article, Howard M Wasserman explores the interplay between the APD statutes and the First Amendment. First, Mr. Wasserman discusses the three categories of restrictions on the freedom of speech, focusing primarily on private civil tort actions …

Studies On The Capacitance Of Nickel Oxide Films: Effect Of Heating Temperature And Electrolyte Concentration, Venkat Srinivasan, John W. Weidner

Faculty Publications

Nickel oxide films were prepared by electrochemically precipitating the hydroxide and heating it in air to form the oxide. The resulting oxide films behave as a capacitor. The capacitance of the oxide depends on the heating temperature, showing a maximum at 300°C. The mechanism of charge storage was studied by measuring the capacitance and surface area as a function of heating temperature, and the capacitance in different electrolytes and potential windows. The charge-storage mechanism is believed to be a surface redox reaction involving adsorbed hydroxyl ions.

Development Of A New Electrodeposition Process For Plating Of Zn-Ni-X (X = Cd, P) Alloys: I. Corrosion Characteristics Of Zn-Ni-Cd Ternary Alloys, Anand Durairajan, Bala S. Haran, Ralph E. White, Branko N. Popov

Faculty Publications

A new Zn-Ni-Cd plating process was developed which offers a unique way of controlling and optimizing the Ni and Cd contents in the final deposit. Zinc-nickel-cadmium alloy was deposited from a 0.5 M NiSO₄ + 0.2 M ZnSO₄ bath in the presence of 0.015 M CdSO₄ and 1 g/L nonyl phenyl polyethylene oxide. Using this process a Zn-Ni-Cd ternary alloy, with a higher nickel content as compared to that obtained from conventional Zn-Ni baths, was synthesized. The Zn-Ni-Cd alloy coatings deposited from an electrolyte containing 0.015 M (0.3%) CdSO₄ has a Zn to Ni ratio of …

Ni-Composite Microencapsulated Graphite As The Negative Electrode In Lithium-Ion Batteries Ii: Electrochemical Impedance And Self-Discharge Studies, P. Yu, James A. Ritter, Ralph E. White, Branko N. Popov

Faculty Publications

Electrochemical impedance and self-discharge studies were carried out to investigate lithium intercalation into bare and Ni-coated KS10 graphite. Values of the charge-transfer resistances, exchange current densities, surface film resistances, and lithium-ion diffusion coefficients as functions of the state of charge (SOC) all favored the 10 wt % Ni composite KS10 graphite over bare KS10 graphite when these materials were used as the negative electrode in a Li-ion cell with mixed organic electrolyte. The charge-transfer resistances were always lower and gave rise to between 26 and 27% larger exchange current densities, which increased from 137 to 614 mA/g as the SOC …

Cardiovascular Disease Prevention By Sports: Myth Or Reality?, Maria João C. A. Almeida, Steven N. Blair

Faculty Publications

Low levels of physical activity and fitness substantially increase risk of several chronic diseases, reduce longevity, and lead to loss of function. The strength and relation of inactivity to health problems and the high prevalence of sedentary habits in most countries of the world make lack of exercise a major public health problem. Fortunately, there is now good consensus regarding public health recommendations for physical activity from many important medical, scientific, and public health organizations. Recent research on physical activity interventions provides additional approaches to helping sedentary adults become more physically active.

A Semianalytical Method For Predicting Primary And Secondary Current Density Distributions: Linear And Nonlinear Boundary Conditions, Dhanwa Thirumalai, Ralph E. White

Faculty Publications

No abstract provided.

Development Of A New Electrodeposition Process For Plating Of Zn‐Ni‐X (X = Cd, P) Alloys: I. Corrosion Characteristics Of Zn‐Ni‐Cd Ternary Alloys, Anand Durairajan, Bala S. Haran, Ralph E. White, Branko Popov

Faculty Publications

No abstract provided.

Computational Fluid Dynamics Modeling Of A Lithium/Thionyl Chloride Battery With Electrolyte Flow, W. B. Gu, C. Y. Wang, John W. Weidner, Rudolph G. Jungst, Ganesan Nagasubramanian

Faculty Publications

A two-dimensional model is developed to simulate discharge of a lithium/thionyl chloride primary battery. As in earlier one-dimensional models, the model accounts for transport of species and charge, and electrode porosity variations and electrolyte flow induced by the volume reduction caused by electrochemical reactions. Numerical simulations are performed using a finite volume method of computational fluid dynamics. The predicted discharge curves for various temperatures show good agreement with published experimental data, and are essentially identical to results published for one-dimensional models. The detailed two-dimensional flow simulations show that the electrolyte is replenished from the cell head space predominantly through the …

Development Of A New Electrodeposition Process For Plating Of Zn-Ni-X (X = Cd, P) Alloys: Permeation Characteristics Of Zn-Ni-Cd Ternary Alloys, A. Durairajan, B. S. Haran, Ralph E. White, Branko N. Popov

Faculty Publications

It is shown that an electrodeposited Zn-Ni-Cd alloy coating produced from sulfate electrolyte inhibits the discharge of hydrogen on carbon steel. The newly developed ternary alloys have approximately ten times higher corrosion resistance when compared to a Zn-Ni alloy. Hydrogen permeation characteristics of Zn-Ni-Cd alloy coatings were studied and compared with those of a bare and a Zn-Ni alloy coated steel. The transfer coefficient, a, exchange current density, io, thickness dependent adsorption-absorption rate constant, k0, recombination rate constant, k3, surface hydrogen coverage, θH, were obtained by applying a mathematical model to experimental results. Alloys obtained from baths containing higher concentration …

Modeling Lithium Intercalation Of A Single Spinel Particle Under Potentiodynamic Control, Dong Zhang, Branko N. Popov, Ralph E. White

Faculty Publications

A mathematical model is presented for the lithium intercalation of a single spinel particle as a microelectrode under the stimulus of a cyclic linear potential sweep. The model includes both lithium diffusion within the particle and kinetics at the particle/electrolyte interface. The model is used to predict that peak current densities depend linearly on the scan rate to a certain power with a constant term, which is different from the predicted peak current density for a conventional redox system.

Shrinking Core Model For The Discharge Of A Metal Hydride Electrode, Venkat R. Subramanian, Harry J. Ploehn, Ralph E. White

Faculty Publications

A shrinking core model is presented for the galvanostatic discharge of a metal hydride particle. A quantitative criterion for when the shrinking core can be completely neglected or approximated by a pseudosteady-state solution is presented. The effect of shrinking of the core on the discharge behavior of a metal hydride particle is also studied.