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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 …

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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.

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A Mathematical Contraction And Automated Analysis Of Internal Controls, Andrew D. Bailey Jr, Gordon Leon Duke, James Gerlach, Chen-En Ko, Rayman D. Meservy, Andrew B. Whinton Nov 1982

A Mathematical Contraction And Automated Analysis Of Internal Controls, Andrew D. Bailey Jr, Gordon Leon Duke, James Gerlach, Chen-En Ko, Rayman D. Meservy, Andrew B. Whinton

Faculty Publications

This paper presents a precedent oriented computer assisted method of designing, analyzing and evaluating systems of internal controls. The ..!..nternal Control _!iodel, TICOM III, is fundamentally a design and analysis tool useful in the context of Automated Office Information Systems (AOIS's). Traditional analysis and evaluation tools, such as flowcharting, written narratives and questionnaires, are inefficient, if not insufficient, to support the design and control analysis of these new systems. The advantages of TICOM III over traditional methods such as narrative description, questionnaires and flowcharts are: (1) the evaluation can be more rigorous and exhaustive because of the speed, accuracy and …

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The Fallacy Of Weighting Asset Value And Earnings Value In The Appraisal Of Corporate Stock, Elmer J. Schaefer Jul 1982

The Fallacy Of Weighting Asset Value And Earnings Value In The Appraisal Of Corporate Stock, Elmer J. Schaefer

Faculty Publications

No abstract provided.

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High-Temperature Battery Calorimeter, L. D. Hansen, R. H. Hart, D. M. Chen, H. F. Gibbard Apr 1982

High-Temperature Battery Calorimeter, L. D. Hansen, R. H. Hart, D. M. Chen, H. F. Gibbard

Faculty Publications

A battery calorimeter was built for the measurement of thermal energy generation of high-temperature lithium–aluminum/iron sulfide battery cells, which are under development for electric vehicle propulsion and other energy storage applications. The calorimeter was designed with a temperature range of 400˚–500˚C, a detection limit of 1 mW, and an upper limit of heat flow of 50 W. The results of measurements on 200-Ah LiAl/FeS cells were in excellent agreement with the predictions of thermodynamic calculations based on precise measurements of the total cell polarization and the temperature coefficient of the emf. Details of the construction and operation principles of this …

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A Hidden-Line Algorithm For Hyperspace, Robert P. Burton, David R. Smith Feb 1982

A Hidden-Line Algorithm For Hyperspace, Robert P. Burton, David R. Smith

Faculty Publications

An object-space hidden-line algorithm for higher-dimensional scenes has been designed and implemented. Scenes consist of convex hulls of any dimension, each of which is compared against the edges of all convex hulls not eliminated by a hyperdimensional clipper, a depth test after sorting and a minimax text. Hidden and visible elements are determined in accordance with the dimensionality of the selected viewing hyperspace. When shape alone is the attribute of interest, hidden-line elimination need be performed only in that hyperspace. The algorithm is of value in the production of shadows of hyperdimensional models, including but not limited to four-dimensional space-time …

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Conductance In Restricted-Dimensionality Accumulation Layers, A. B. Fowler, A. Hartstein, Richard A. Webb Jan 1982

Conductance In Restricted-Dimensionality Accumulation Layers, A. B. Fowler, A. Hartstein, Richard A. Webb

Faculty Publications

Conductance has been studied in metal-oxide-silicon field-effect transistor accumulation-layer samples in which it is possible to constrict the channel to small dimensions both perpendicular to the surface and perpendicular to the channel. A temperature-dependent conductance σ=σ0exp[-(T0/T)n] is observed, where n=1/2 for small channel widths and n=1/3 for larger channel widths. It is believed that this behavior arises from a transition from one-dimensional to two-dimensional variable-range hopping in the sample.

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Classroom Demonstration Of Sunspots, Thomas O. Callaway, Harry D. Downing, Glen T. Clayton Jan 1982

Classroom Demonstration Of Sunspots, Thomas O. Callaway, Harry D. Downing, Glen T. Clayton

Faculty Publications

No abstract provided.

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Physical Science Workshop Course For Elementary Teachers, Glen T. Clayton, Harry D. Downing, Thomas O. Callaway Jan 1982

Physical Science Workshop Course For Elementary Teachers, Glen T. Clayton, Harry D. Downing, Thomas O. Callaway

Faculty Publications

Science for elementary school grades K-6 varies somewhat in content from one textbook series to another, but it is fairly common that 40-60% of the material covered is directly related to physics. These texts suggest that certain learning activities such as experiments, demonstrations, and observations be carried out by the teacher and the class. Often the apparatus for a learning activity is to be constructed from simple, readily available materials. The typical elementary school teacher has had little experience in performing experiments and is often frustrated in his/her attempts at carrying out the suggested learning activity. To meet this need …

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Bond Hybrids And The Structures Of The Lanthanide Metals [Abstract], Richard H. Langley Jan 1982

Bond Hybrids And The Structures Of The Lanthanide Metals [Abstract], Richard H. Langley

Faculty Publications

The ideas developed by Altmann, Coulson, and Hume-Rothery to relate bond hybrids to metal structures are extended to include treatment of the f orbitals. A discussion of the possible hybrids along with their application to the lanthanide metals will be considered.

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On Admissible Shifts Of Generalized White Noises, Hui Hsiung Kuo, W. Smolenski Jan 1982

On Admissible Shifts Of Generalized White Noises, Hui Hsiung Kuo, W. Smolenski

Faculty Publications

Let S be the Schwartz space of rapidly decreasing real functions. The dual space S* consists of the tempered distributions and the relation S ⊂ L2(R) ⊂ S* holds. Let γ be the Gaussian white noise on S* with the characteristic functional γ(ξ) = exp{-∥ξ∥2/2}, ξ ∈ S, where ∥·∥ is the L2(R)-norm. Let ν be the Poisson white noise on S* with the characteristic functional ν(ξ) = expΥ{hooked}R∫R {[exp(iξ(t)u)] - 1 - (1 + u2)-1(iξ(t)u)} dη(u)dt), ξ ∈ S, where the Lévy measure is assumed to satisfy the condition ∫Ru2dη(u) < ∞. It is proved that γ*ν has the same dichotomy property for shifts as the Gaussian white noise, i.e., for any ω ∈ S*, the shift (γ*ν)ω of γ*ν by ω and γ*ν are either equivalent or orthogonal. They are equivalent if and only if when ω ∈ L2(R) and the Radon-Nikodym derivative is derived. It is also proved that for the Poisson white noice νω is orthogonal to ν for any non-zero ω in S*. © 1982.

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Matroids Whose Ground Sets Are Domains Of Functions, James Oxley Jan 1982

Matroids Whose Ground Sets Are Domains Of Functions, James Oxley

Faculty Publications

From an integer-valued function f we obtain, in a natural way, a matroid Mf on the domain of f. We show that the class of matroids so obtained is closed under restriction, contraction, duality, truncation and elongation, but not under direct sum. We give an excluded-minor characterization of and show that consists precisely of those transversal matroids with a presentation in which the sets in the presentation are nested. Finally, we show that on an n-set there are exactly 2”. © 1982, Australian Mathematical Society. All rights reserved.

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Asymptotic Properties Of Random Subsets Of Projective Spaces, Douglas G. Kelly, James G. Oxley Jan 1982

Asymptotic Properties Of Random Subsets Of Projective Spaces, Douglas G. Kelly, James G. Oxley

Faculty Publications

A random graph on n vertices is a random subgraph of the complete graph on n vertices. By analogy with this, the present paper studies the asymptotic properties of a random submatroid ωr of the projective geometry PG(r— 1, q). The main result concerns Kr, the rank of the largest projective geometry occurring as a submatroid of ωr. We show that with probability one, for sufficiently large r, Krtakes one of at most two values depending on r. This theorem is analogous to a result of Bollobás and Erdös on the clique number of a random graph. However, whereas from …

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On Some Extremal Connectivity Results For Graphs And Matroids, James G. Oxley Jan 1982

On Some Extremal Connectivity Results For Graphs And Matroids, James G. Oxley

Faculty Publications

Dirac and Halin have shown for n = 2 and n = 3 respectively that a minimally n-connected graph G has at least ((n-1)|V(G)|-2n)/(2n-1) vertices of degree n. This paper determines the graphs which are extremal with respect to these two results and, in addition, establishes a similar extremal result for minimally connected matroids. © 1982.

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Distributional Boundary Values Of Harmonic And Analytic Functions, R. Estrada, R. P. Kanwal Jan 1982

Distributional Boundary Values Of Harmonic And Analytic Functions, R. Estrada, R. P. Kanwal

Faculty Publications

A theory for distributional boundary values of harmonic and analytic functions is presented. In this analysis there arise several indicators that measure the growth of these functions near the boundaries. An extension of the Phragmén-Lindelöf maximum principle is derived. Furthermore, the algebraic properties of the space of real periodic distributions are studied. By introducing a new product, the harmonic product, the boundary conditions involving harmonic functions are transformed into ordinary differential equations. © 1982.

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Extensions Of L-Homomorphisms, Eleanor R. Aron, Anthony W. Hager, James J. Madden Jan 1982

Extensions Of L-Homomorphisms, Eleanor R. Aron, Anthony W. Hager, James J. Madden

Faculty Publications

It is shown that, in abelian l-groups, each morphism to a complete vector lattice extends over any majorizing embedding. This extends a result of the first author for Archimedean f-algebras with identity, and the recent Luxemburg-Schep theorem for vector lattices, and solves a problem of Conrad and McAlister. The proof presented here differs substantially from the Luxem- burg-Schep proof. Ours uses the Yosida representation and Gleason’s theorem on topological projectivity—this is novel, and seems relatively economical and transparent. The l-group theorem is shown to imply, and with some modestly categorical machinery, to be implied by, certain similar statements in subcategories …

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Some Comments On The Erdos-Renyl Law And A Theorem Of Shepp, James Lynch Jan 1982

Some Comments On The Erdos-Renyl Law And A Theorem Of Shepp, James Lynch

Faculty Publications

We show that the finiteness of the moment generating function is necessary for the finiteness of the lim sup of the moving averages considered by Shepp (1964). This also implies that the same must be true for the Erdos-Renyi law of large numbers.

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Library Skills And Resources For Business Research., Stanley P. Lyle, Donald L. Ashbaugh Jan 1982

Library Skills And Resources For Business Research., Stanley P. Lyle, Donald L. Ashbaugh

Faculty Publications

This independent study module is intended to introduce business administration students and managers to business information available in books; periodicals; and other library sources; and to teach library search strategies for the acquisition of needed information with a minimum expenditure of time. The module consists of six parts. The first three begin with specific objectives and end with exercises on locating books on business topics using (1) the card catalog; (2) indexes and abstracts; and (3) general business reference works. Exercises at the end of part three are intended to illustrate the types of questions such sources can answer and …

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The Role Of Economic Analysis In Public Range Management, B. Delworth Gardner Jan 1982

The Role Of Economic Analysis In Public Range Management, B. Delworth Gardner

Faculty Publications

Economic analysis has a vital, if not indispensable, role to play in the management decisions of the Bureau of Land Management (BLM} if the national welfare is to be served effectively. This rather sweeping conclusion is justified by the nature of the management problems faced by the BLM and by the unique view of the world provided by the field of economics.

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Metrizability And The Frechet-Urysohn Property In Topological Groups, Peter J. Nyikos Dec 1981

Metrizability And The Frechet-Urysohn Property In Topological Groups, Peter J. Nyikos

Faculty Publications

A question of Arhangel'skii, whether weakly first countable topological groups are metrizable, is answered in two ways: if the Hausdorff axiom is assumed, the answer is yes, but in general a weakly first countable topological group need not be pseudometrizable. The former result is obtained as a corollary of a more general sufficient condition for a sequential group to be Fr&chet-Urysohn. A general necessary and sufficient condition for a sequential group to be Frechet-Urysohn is given, and a number of questions are raised. Examples are given to show in what respect the theorems of the paper are the "best possible".

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Macroscopic Quantum Tunneling In 1-Μm Nb Josephson Junctions, Richard F. Voss, Richard A. Webb Jul 1981

Macroscopic Quantum Tunneling In 1-Μm Nb Josephson Junctions, Richard F. Voss, Richard A. Webb

Faculty Publications

The probability distributions for switching out of the superconducting state of low-cur-rent-density 1-μm Nb Josephson junctions with capacitance ≈ 0.1 pF have been measured as a function of temperature T down to 3 mK. Below 100 mK the distribution widths become independent of T. The results are in excellent agreement with predictions for the quantum tunneling of the (macroscopic) junction phase that include the reduction of tunneling rates due to dissipation.

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Effect Of Backup Roll Length And Roll Neck Length On Profile For 4-H Mills, T. Ohto, Guna S. Selvaduray Mar 1981

Effect Of Backup Roll Length And Roll Neck Length On Profile For 4-H Mills, T. Ohto, Guna S. Selvaduray

Faculty Publications

No abstract provided.

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Landau Free Energy Form At The F Point Of The Roverline3 Structure, Dorian M. Hatch, Daniel L. Decker Feb 1981

Landau Free Energy Form At The F Point Of The Roverline3 Structure, Dorian M. Hatch, Daniel L. Decker

Faculty Publications

A free energy form compatible with the F point of the trigonal D63d(Roverline3c) symmetry is constructed. It is a function of the order parameter, elastic strain, and the stress. The resulting free energy exhibits a close formalistic analogy to the stressed cubic perovskite structures and their associated multicriticality.

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Classical Demonstrations Performed To A New Beat, John T. Moore Jan 1981

Classical Demonstrations Performed To A New Beat, John T. Moore

Faculty Publications

Music can help fill the gaps in time during demonstrations and make demonstrations more exciting.

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Wave Demonstration Device, Glen T. Clayton, Harry D. Downing, Thomas O. Callaway Jan 1981

Wave Demonstration Device, Glen T. Clayton, Harry D. Downing, Thomas O. Callaway

Faculty Publications

Students often have difficulty gaining an understanding of wave motion without effective demonstrations being performed in the lecture. Many excellent approaches utilizing ripple tanks, waves on a spring, chain, rope, etc., are customarily employed. Perhaps the most well-known device for demonstrating many of the effects of wave motion is the shive or bell wave motion machine.1 The purpose of the present note is to describe a simple, inexpensive device which can be easily constructed by a teacher or student and can be used to demonstrate many of the properties of wave motion.

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Monetary Approaches To Devaluation: Comment, Yeung-Nan Shieh Jan 1981

Monetary Approaches To Devaluation: Comment, Yeung-Nan Shieh

Faculty Publications

No abstract provided.

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A Rolling Laboratory Platform For The Mobility Handicapped, John T. Moore Jan 1981

A Rolling Laboratory Platform For The Mobility Handicapped, John T. Moore

Faculty Publications

Portable laboratory stations designed for use by the mobility handicapped are available, but the expense of these precludes their use by many institutions. These authors share a more affordable solution.

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A White Ammonia Fountain, John T. Moore Jan 1981

A White Ammonia Fountain, John T. Moore

Faculty Publications

Red, white, and blue ammonia fountains are a stunning addition to chemistry magic shows.

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Generalized Continuous And Hypercontinuous Lattices, G. Gierz, J. D. Lawson Jan 1981

Generalized Continuous And Hypercontinuous Lattices, G. Gierz, J. D. Lawson

Faculty Publications

No abstract provided.

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The Decline And Fall Of Taxable Income, Glenn E. Coven Jan 1981

The Decline And Fall Of Taxable Income, Glenn E. Coven

Faculty Publications

No abstract provided.

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