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Characterizations Of Antimony Tri‐Sulfide Chemically Deposited With Silicotungstic Acid, O. Savadogo, K. C. Mandal Jan 1992

Characterizations Of Antimony Tri‐Sulfide Chemically Deposited With Silicotungstic Acid, O. Savadogo, K. C. Mandal

Faculty Publications

No abstract provided.

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Parameter Sensitivity And Optimization Predictions Of A Hydrogen/Oxygen Alkaline Fuel Cell Model, Michael C. Kimble, Ralph E. White Jan 1992

Parameter Sensitivity And Optimization Predictions Of A Hydrogen/Oxygen Alkaline Fuel Cell Model, Michael C. Kimble, Ralph E. White

Faculty Publications

A mathematical model is used to predict parameter sensitivities and optimal design parameters for a hydrogen/oxygen alkaline fuel cell. A sensitivity analysis of the various transport and electrode kinetic parameters indicates which parameters have the most influence on the predicted current density and over which range of potentials these parameters affect the fuel-cell performance the most. This information can be used to decide which parameters should be optimized or determined more accurately through further modeling or experimental studies. The effect of various design parameters on the limiting current density are investigated to determine if optimal values exist for the parameters. …

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The Self-Discharge Of The Niooh/Ni(Oh)2 Electrode Constant Potential Study, Z. Mao, Ralph E. White Jan 1992

The Self-Discharge Of The Niooh/Ni(Oh)2 Electrode Constant Potential Study, Z. Mao, Ralph E. White

Faculty Publications

Hydrogen oxidation currents at a NiOOH/Ni(OH)2 electrode were measured directly at constant potentials for various hydrogen pressures and states of charge. It was found that the hydrogen oxidation current is linearly proportional to the hydrogen pressure at all electrode potentials and that the logarithm of the anodic current is a linear function of electrode potential. It was also found that hydrogen oxidation on the nickel substrate material was strongly inhibited by the presence of nickel hydroxide on the substrate surface. By comparing the currents for hydrogen oxidation and oxygen evolution on the NiOOH/Ni(OH)2 electrode and on a nickel …

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Mathematical Modeling Of Cathodic Protection Using The Boundary Element Method With A Nonlinear Polarization Curve, J. F. Fan, S. N. R Pakalapati, T. V. Nguyen, Ralph E. White, R. B. Griffin Jan 1992

Mathematical Modeling Of Cathodic Protection Using The Boundary Element Method With A Nonlinear Polarization Curve, J. F. Fan, S. N. R Pakalapati, T. V. Nguyen, Ralph E. White, R. B. Griffin

Faculty Publications

The distributions of potential and current density around a cathodically protected pipeline in seawater were determined using the boundary element technique. A nonlinear polarization curve for a low carbon steel in artificial sea water was obtained from dc-potentiodynamic measurements and was fitted for use as the boundary condition on the pipe. The program was used to evaluate cases in which one or two aluminum sacrificial anodes are used to protect a low carbon steelpipe in seawater. The results show that the number of anodes, the sizes of the anodes, and the distance between the anodes and the cathode are of …

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Hydrogen Diffusion, Solubility, And Water Uptake In Dow's Short-Side-Chain Perfluorocarbon Membranes, Yu-Min Tsou, M. C. Kimble, Ralph E. White Jan 1992

Hydrogen Diffusion, Solubility, And Water Uptake In Dow's Short-Side-Chain Perfluorocarbon Membranes, Yu-Min Tsou, M. C. Kimble, Ralph E. White

Faculty Publications

Hydrogen gas diffusion coefficients and solubilities as well as water uptake values are reported for Dow's short-side-chain perfluoro-sulfonic and -carboxylic membranes of different equivalent weight (EW). The diffusion coefficients and solubilities were determined with an electrochemical test cell. Hydrogen solubility decreases with increasing EW in the lower EW range and tends to level off at higher EWs for both types of membranes. Both hydrogen solubility and diffusion coefficients of a sulfonic membrane with EW higher than 800 are higher than the corresponding values of a carboxylic membrane of similar EW. An unusual maximum is observed in the diffusion coefficient-EW plot …

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Calorimetric Determination Of The Thermoneutral Potential Of Li/Bcx And Li/Socl2 Cells, E. E. Kalu, Ralph E. White, E. C. Darcy Jan 1992

Calorimetric Determination Of The Thermoneutral Potential Of Li/Bcx And Li/Socl2 Cells, E. E. Kalu, Ralph E. White, E. C. Darcy

Faculty Publications

Through a continuous recording of the cell voltage, heat flow, and current, the effective thermoneutral potential, Eetpof Li/BCX and Li/SOCl2 cells were determined in the temperature range, 0–60°C. The depth of discharge (DOD), temperature (T), and cell type (cell chemistry) affect the effective thermoneutral potential. The effective thermoneutral potential, Eetp differs from the classical thermoneutral potential of a cell because it takes into account the heat flow due to non-faradaic processes. The average effective thermoneutral potential at 25°C (determined by selecting the most constant region of Eetp vs. time of discharge) was 4.0 …

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Comparing Electrochemical Impedance Spectroscopy Methods For Estimating The Degree Of Delamination Of Organic Coatings On Steel, S. A. Mccluney, S. N. Popova, Branko N. Popov, Ralph E. White, R. B. Griffin Jan 1992

Comparing Electrochemical Impedance Spectroscopy Methods For Estimating The Degree Of Delamination Of Organic Coatings On Steel, S. A. Mccluney, S. N. Popova, Branko N. Popov, Ralph E. White, R. B. Griffin

Faculty Publications

Electrochemical impedance spectroscopy (EIS) was used to evaluate the degree of delamination of the epoxy primer Uniprime ED-41 electrocoated on phosphate-treated cold-rolled steel in 3.5% NaCl exposed to air. Specimens with coating thicknesses of 20.3 and 20.8 µm and surface areas of 78.5 cm2 were used. Coating parameters were obtained using a circuit-analog model. The area of delamination was estimated using several EIS parameters, including the pore resistance and the break point frequency. These values were compared to the corroded area determined visually. All methods considered exhibited a strong correlation over some or all of the range of …

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Reduction Of Chromium (Vi) When Solar Selective Black Chromium Is Deposited In The Presence Of Organic Additive, Branko N. Popov, Ralph E. White, D. Slavkov, Z. Koneska Jan 1992

Reduction Of Chromium (Vi) When Solar Selective Black Chromium Is Deposited In The Presence Of Organic Additive, Branko N. Popov, Ralph E. White, D. Slavkov, Z. Koneska

Faculty Publications

Electrochemical dc methods were used to study the reduction of chromium (VI) in the presence of organic additives. It is shown that F–, thiourea, and citric acid are essential to enable deposition of black chrome from concentrated chromic acid solutions. A new formulation of the plating bath is defined. The optimum operating conditions under which spectrally selective surface of black chrome is deposited have been determined.

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Measurements Of The Fundamental Thermodynamic Parameters Of Li/Bcx And Li/Socl2 Cells, E. E. Kalu, Ralph E. White, E. C. Darcy Jan 1992

Measurements Of The Fundamental Thermodynamic Parameters Of Li/Bcx And Li/Socl2 Cells, E. E. Kalu, Ralph E. White, E. C. Darcy

Faculty Publications

The thermodynamic data needed to estimate the heat generation characteristics of Li/BCX and Li/SOCl2 cells were determined using two experimental techniques, equilibrium or reversible cell discharge and measurement of open circuitpotential as a function of temperature. The results obtained showed that the reversible cell potential (Er), the temperature dependence of the reversible cell potential (dEr/dT) and thermoneutral potential (Eh) of the BCX cell were respectively, Er,25oc = 3.74 V, dEr/dT = –0.857 ± 0.198 mV/K and Eh = 3.994 …

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A Mathematical Model Of A Cuo/Cu Vaporvolt Cell, Makoto Kawanami, Trung V. Nguyen, Ralph E. White Jan 1992

A Mathematical Model Of A Cuo/Cu Vaporvolt Cell, Makoto Kawanami, Trung V. Nguyen, Ralph E. White

Faculty Publications

A new battery named "Vaporvolt"b cell is in the early stage of its development. A mathematical model of a CuO/CuVaporvolt cell is presented that can be used to predict the potential and the transport behavior of the cell during discharge.A sensitivity analysis of the various transport and electrokinetic parameters indicates which parameters have the mostinfluence on the predicted energy and power density of the Vaporvolt cell. This information can be used to decide whichparameters should be optimized or determined more accurately through further modeling or experimental studies. Theoptimal thicknesses of electrodes and separator, the concentration of the electrolyte, and …

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The Medieval Librarian: Information Management In The Southwest German Empire At The Close Of The Middle Ages, Albert Winkler Jan 1992

The Medieval Librarian: Information Management In The Southwest German Empire At The Close Of The Middle Ages, Albert Winkler

Faculty Publications

The direct precursor of the modern librarian or archivist was the medieval scribe or notary. This person was responsible for the production or identification, storage, and retrieval of information and was the first information manager since antiquity to use vernacular languages in documents and books. The medieval information manager was highly educated and was often a prestigious and powerful official in whom important information and state secrets were entrusted. The civic secular scribes borrowed much from church practices but also worked out their own methods of source composition, verification, arrangement, and preservation. These procedures developed into many of the practices …

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When Is A Corporate Executive "Substantially Unfit To Serve"?, Jayne W. Barnard Jan 1992

When Is A Corporate Executive "Substantially Unfit To Serve"?, Jayne W. Barnard

Faculty Publications

The recently enacted Securities Enforcement Remedies and Penny Stock Reform Act of 1990 provides that, in an SEC enforcement action, a federal court may enjoin or "disbar" the defendant from serving in the future as an officer or director of a public company. A court may enter such an order if it finds that the defendant is "substantially unfit" to serve as a corporate executive; the Act, however, does not define "substantial unfitness." In this Article Professor Jayne Barnard provides a framework for defining this term and identifying the defendants to which the Remedies Act should apply. Professor Barnard begins …

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Legal Education And The Theatre Of The Absurd: "Can't Anybody Play This Here Game?", Paul A. Lebel Jan 1992

Legal Education And The Theatre Of The Absurd: "Can't Anybody Play This Here Game?", Paul A. Lebel

Faculty Publications

No abstract provided.

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Laurence G. Thompson: Biographical And Bibliographical Footnotes, Christian Jochim, Rodney Taylor Jan 1992

Laurence G. Thompson: Biographical And Bibliographical Footnotes, Christian Jochim, Rodney Taylor

Faculty Publications

No abstract provided.

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Confucius And Capitalism: Views Of Confucianism In Works On Confucian Ethics And Economic Development, Christian Jochim Jan 1992

Confucius And Capitalism: Views Of Confucianism In Works On Confucian Ethics And Economic Development, Christian Jochim

Faculty Publications

No abstract provided.

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What Is The Relationship Between Workplace Literacy And Content-Based Instruction?, Rosemary C. Henze, Anne Katz Jan 1992

What Is The Relationship Between Workplace Literacy And Content-Based Instruction?, Rosemary C. Henze, Anne Katz

Faculty Publications

No abstract provided.

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The Impropriety Of Expert Witness Testimony On The Law, Thomas E. Baker Jan 1992

The Impropriety Of Expert Witness Testimony On The Law, Thomas E. Baker

Faculty Publications

Professor Baker weighs in on a new trend of allowing expert opinion on the status of the law. He begins with a brief history of lay and expert opinion testimony and continues with an analysis of Rule 702 of the Federal Rules of Evidence before concluding that expert opinion on the law simply has no place in federal practice.

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Chemical Structure Of Char In The Transition From Devolatilization To Combustion, Thomas H. Fletcher, Mark S. Solum, David M. Grant, Ronald J. Pugmire Jan 1992

Chemical Structure Of Char In The Transition From Devolatilization To Combustion, Thomas H. Fletcher, Mark S. Solum, David M. Grant, Ronald J. Pugmire

Faculty Publications

Coal devolatilization experiments are generally conducted separately from char oxidation experiments, and the relationship between the chars generated in the two types of research is often ignored. However, char is one of the most important products of coal devolatilization and must be characterized as a function of temperature and heating rate in a manner similar to that for gaseous devolatilization products. The chemical structure of the parent coal directly affects devolatilization behavior. In this work, the chemical structure of chars from five coals of different rank are examined, and implications on char reactivity are discussed. Chars were obtained as a …

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“Names, Hypocoristic,” In Anchor Bible Dictionary, Dana M. Pike Jan 1992

“Names, Hypocoristic,” In Anchor Bible Dictionary, Dana M. Pike

Faculty Publications

A hypocoristicon is generally a single-element name resulting from the shortening of an originally longer one. Hebrew names and Semitic names in general, were often composed of two elements (or, as was often the case in Akkadian names and sometimes the case with West Semitic ones, three elements) which formed a nominal or verbal sentence.

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Error Patterns In Research Papers By Pacific Kim Students, Chris Crowe Jan 1992

Error Patterns In Research Papers By Pacific Kim Students, Chris Crowe

Faculty Publications

By looking for patterns of errors in the research papers of Asian students, educators can uncover pedagogical strategies to help students avoid repeating such errors. While a good deal of research has identified a number of sentence-level problems which are typical of Asian students writing in English, little attempt has been made to consider the specific problems which a long research paper presents. Of these problems, Asian students have the most difficulty integrating sources from research and developing transition, unity, and cohesion. These problems stem not necessarily from different thought patterns or primary language interference, but from the challenge of …

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X-Ray Diode Using A Silicon Field Emission Photocathode, W. I. Karian, Larry V. Knight, David D. Allred, A. Reyes-Mena Jan 1992

X-Ray Diode Using A Silicon Field Emission Photocathode, W. I. Karian, Larry V. Knight, David D. Allred, A. Reyes-Mena

Faculty Publications

We have produced arrays of 10,000 sharp p-type silicon points using an etch plus oxidation method. The points were used as electron emitters. No high vacuum cesiation or high temperature cleaning was needed to observe the electron emission. These are seen to be photosensitive sources of electrons at 200 K and 300 K. They were also used to produce AlKα x-rays. This constitutes the first use of etched, point arrays for generating electrons for x-ray sources.

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Craft Specialization And Exchange Among The Virgin Anasazi, James R. Allison Jan 1992

Craft Specialization And Exchange Among The Virgin Anasazi, James R. Allison

Faculty Publications

A large proportion of the culinary ceramics found on 11th century Anasazi sites in the Moapa Valley of Nevada were manufactured more that fifty miles to the east, in northwestern Arizona. This paper uses analyses of ceramics from sites in southeastern Nevada, northwestern Arizona, and southwestern Utah to more precisely define the regional distribution of these ceramics and to assess their degree of standardization in form and technology. Questions relating to the development of community specialization and interaction in egalitarian societies are--examined in light of these analyses.

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Chemical Percolation Model For Devolatilization: Ii. Temperature And Heating Rate Effects On Product Yields, Thomas H. Fletcher, Alan R. Kerstein, Ronald J. Pugmire, David M. Grant Jan 1992

Chemical Percolation Model For Devolatilization: Ii. Temperature And Heating Rate Effects On Product Yields, Thomas H. Fletcher, Alan R. Kerstein, Ronald J. Pugmire, David M. Grant

Faculty Publications

The chemical percolation devolatilization (CPD) model describes the devolatilization behavior of rapidly heated coal based on the chemical structure of the parent coal. Percolation lattice statistics are employed to describe the generation of tar precursors of finite size based on the number of cleaved labile bonds in the infinite lattice. The chemical percolation devolatilization model described here includes treatment of vapor-liquid equilibrium and a cross-linking mechanism. The cross-linking mechanism permits reattachment of metaplast to the infinite char matrix. A generalized vapor pressure correlation for high molecular weight hydrocarbons, such as coal tar, is proposed based on data from coal liquids. …

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An Approach To The Evaluation Of Elt Preparation Programs, Stephen J. Gaies Jan 1992

An Approach To The Evaluation Of Elt Preparation Programs, Stephen J. Gaies

Faculty Publications

Discussion of the evaluation of training programs for teachers of English as a Second Language consists of: (1) characterization of general approaches; (2) review of reasons for interest in program evaluation; and (3) description of a University of Northern Iowa (UNI) evaluation project that uses a portfolio approach extending 3 years beyond program completion. At UNI; assessment of teacher trainees occurs at four points in the trainee's career: at declaration of undergraduate ESL major; at approximately the second semester of the junior year; during the last undergraduate semester; and 1-3 years after graduation. The principal method used is evaluation of …

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Math Student Teachers: How Well Prepared Are They?, Richard G. Stahlhut Jan 1992

Math Student Teachers: How Well Prepared Are They?, Richard G. Stahlhut

Faculty Publications

This study was conducted to find out how well mathematics majors at the University of Northern Iowa were prepared in the foundations of effective teaching practices and how well they performed during the student teaching experience. Data were gathered from mathematics student teachers (N=22) who were observed; interviewed; and asked to keep daily journals. Results suggest that mathematics teacher education students: (1) be required to create practical problems for pupils for every mathematics course in grades 7-12; (2) be required to take a course that deals with writing across the curriculum so they can better incorporate English into their classroom …

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Justice In The Black Hawk War: The Trial Of Thomas Jose, Albert Winkler Jan 1992

Justice In The Black Hawk War: The Trial Of Thomas Jose, Albert Winkler

Faculty Publications

During Utah’s Black Hawk War 1865-1868 there were some instances of whites murdering Indians, and these people were never brought to trial. In 1866, Thomas Jose was brought to trial for killing an Indian, and he was convicted for murder. Even though his punishment was relatively mild, the justice system was made to work in defense of the Indians.

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The Ute Mode Of War In The Conflict Of 1865-1868, Albert Winkler Jan 1992

The Ute Mode Of War In The Conflict Of 1865-1868, Albert Winkler

Faculty Publications

The Ute Indians of Utah rebelled in 1865 which led to war for the next three years. Throughout the conflict, small numbers of Utah warriors showed great skill in raiding white settlements of central Utah and in keeping their enemies at bay.

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Creating Informal Play Opportunities: Are Parents' And Preschoolers' Initiations Related To Children's Competence With Peers?, Gary W. Ladd, Craig H. Hart Jan 1992

Creating Informal Play Opportunities: Are Parents' And Preschoolers' Initiations Related To Children's Competence With Peers?, Gary W. Ladd, Craig H. Hart

Faculty Publications

Preschoolers' social competence may depend on the frequency with which informal play activities are initiated by parents', children, and playmates. In this study, measures ofchildren's peer relations in informal and school contexts and the frequency of parents', children's, and peers' play initiations were obtained with 83 preschool children and their families on 2 occasions. Frequent parent initiations were associated with higher levels of prosocial behavior, lower levels of nonsocial behavior and, among boys, greater peer acceptance in preschool. Children who were more initiating of informal peer contacts displayed less anxious behavior in school and were better liked by their classmates. …

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Manufacturing Of Atomically Sharp Silicon Tips And Their Use As Photocathodes, W. I. Karian, Larry V. Knight, David D. Allred, A. Reyes-Mena Jan 1992

Manufacturing Of Atomically Sharp Silicon Tips And Their Use As Photocathodes, W. I. Karian, Larry V. Knight, David D. Allred, A. Reyes-Mena

Faculty Publications

The discovery and understanding of the photoelectric effect led to the study of photoemissive materials fall into two major categories: classical photoemitters and negative-electron-affinity (NEA) materials. Classical photoemitters usually involve an alkali metal, a group-V element such as phosphorus, silver, and/or oxygen. An example is the Ag-O-Cs (S1) photoemitter. NEA photocathodes consist of a photoconductive single crystal semiconductor covered with a thin layer of cesium and oxygen. This layer lowers the work function of the photocathode. A dipole layer is formed at the surface, and band bending occurs. This lowers the effective work function. An example is the GaAs(CsO) photocathode …

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Resource Integration Using A Large Knowledge Base In Carnot, Christine Collet, Michael N. Huhns, Wei-Min Shen Dec 1991

Resource Integration Using A Large Knowledge Base In Carnot, Christine Collet, Michael N. Huhns, Wei-Min Shen

Faculty Publications

A method for integrating separately developed information resources that overcomes incompatibilities in syntax and semantics and permits the resources to be accessed and modified coherently is described. The method provides logical connectivity among the information resources via a semantic service layer that automates the maintenance of data integrity and provides an approximation of global data integration across systems. This layer is a fundamental part of the Carnot architecture, which provides tools for interoperability across global enterprises.

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