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Faculty Publications

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1983

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Prediction Of The Current Density At An Electrode At Which Multiple Electrode Reactions Occur Under Potentiostatic Control, Ralph E. White, S. E. Lorimer, R. Darby Jan 1983

Prediction Of The Current Density At An Electrode At Which Multiple Electrode Reactions Occur Under Potentiostatic Control, Ralph E. White, S. E. Lorimer, R. Darby

Faculty Publications

It is often desirable to be able to predict the total current density at an electrode when multiple electrochemical reactions occur there under potentiostatic control. It is also sometimes desirable to include the effect of ionic migration within the diffusion layer upon the predicted total (1) and partial current densities (2). A procedure for doing this can be illustrated by considering the rotating disk electrode (RDE) system and the associated potential distribution near the RDE as shown in Fig. 1 and 2.


An Analysis Of A Back Fed Porous Electrode For The Br2/Br Reaction, John Van Zee, Ralph E. White Jan 1983

An Analysis Of A Back Fed Porous Electrode For The Br2/Br Reaction, John Van Zee, Ralph E. White

Faculty Publications

An experimental analysis of the Br2/Br redox reaction in a porous back fed ruthenium-coated titanium electrode is described. A mathematical model of the steady-state process is presented. Nonlinear regression of the model against the experimental data gives physically meaningful parameter estimates; these parameters and the model provide a design equation for the porous electrode current as a function of specific surface area, bulk Br2 concentration, average total overpotential, and the Reynolds number. The design equation shows that the back fed electrode could reduce the loss of Br2 across the separator and the ohmic loss in …


Variability Of Sediment Removal In A Semi-Arid Watershed, William L. Graf Jan 1983

Variability Of Sediment Removal In A Semi-Arid Watershed, William L. Graf

Faculty Publications

Field and documentary data from Walnut Gulch Watershed, an instrumented semiarid drainage basin of approximately 150 km2 (57 mi2) in southeastern Arizona, show that 83% of the alluvium removed from the basin during a 15‐year erosion episode beginning about 1930 was excavated from the highest‐order stream. The amount of alluvium removed in the erosion episode would have been equal to a covering of about 4 cm (1.6 in) over the entire basin. The rate of sediment removal during the erosion episode was 18 times greater than the rate of present channel sediment transport. Production of sediment from slopes and channel …


Library Use Patterns Among Full- And Part-Time Faculty And Students, Jo Bell Whitlatch Jan 1983

Library Use Patterns Among Full- And Part-Time Faculty And Students, Jo Bell Whitlatch

Faculty Publications

Trends in higher education are toward part-time students and majors in professional fields which are associated with low library use. Research findings at San Jose State University, California and other academic libraries, demonstrate that declining library use may be a future trend. Declining use will further erode administrative support for library budgets. Libraries must become effective in identifying and meeting the information needs of new nontraditional students. User surveys establishing service priorities can be an effective tool in planning library service for future student and faculty populations.


The Pronunciation Of Women: Some Spanish Evidence, Lynn Williams Jan 1983

The Pronunciation Of Women: Some Spanish Evidence, Lynn Williams

Faculty Publications

The material for this article bas been drawn from a larger sociolinguistic survey of various aspects of tbe phonology of 18-26 yr olds in Valladolid carried out between October 1976 and April 1977. The methodology used is basically the same as that developed by William Labov for his New York survey and has become one of the most established methods of enquiry into the social differentiation of the phonology of urban speech-communities. Informants were selected from the Valladolid census records in a semi-random manner and assigned to their socio-economic class according to the criteria of Spanish sociologists. Each informant was …


The Distribution Of Economic Rents When Irrigated Farmland Is Leased, Ray G. Huffaker, B. Gardner Delworth Jan 1983

The Distribution Of Economic Rents When Irrigated Farmland Is Leased, Ray G. Huffaker, B. Gardner Delworth

Faculty Publications

Irrigation water supplied by federal reclamation projects has often been priced below its supply cost (Bureau of Reclamation, 1980, p. F-4). Pricing water below cost has been deliberate policy to stimulate irrigation development in the west. One effect of this underpricing is to add to the economic rents captured by federal water users.


Computing As A Part Of A P.H.D Students Education: A Position Paper, Andrew D. Bailey, Rayman D. Meservy Jan 1983

Computing As A Part Of A P.H.D Students Education: A Position Paper, Andrew D. Bailey, Rayman D. Meservy

Faculty Publications

The skills and abilities associated with computer literacy are becoming required tools for accounting Ph.D. students. Not only are new doctoral students entering Ph.D. programs with better skills, they are also applying these skills more on a day to day basis. This paper presents a brief discussion of a number of issues associated with computer use and computer literacy in general. The paper also presents several aspects of the Ph.D. program at the University of Minnesota and how computers are affecting the program.


Modal Control Of An Unstable Periodic Orbit, William Wiesel, William Shelton Jan 1983

Modal Control Of An Unstable Periodic Orbit, William Wiesel, William Shelton

Faculty Publications

We apply Floquet theory to the problem of designing a control system for a satellite in an unstable periodic orbit. Expansion about a periodic orbit produces a time periodic linear system, which is augmented by a time periodic control term. We show that this can be done such that a) the application of control produces only inertial accelerations, b) positive real Poincare exponents are shifted into the left half-plane, and c) the shift of the exponent is linear with control gain. We apply these developments to an unstable orbit near the Earth-Moon L3 point perturbed by the Sun. Finally, …