Open Access. Powered by Scholars. Published by Universities.®

Digital Commons Network™

Open Access. Powered by Scholars. Published by Universities.®

Faculty Publications

Discipline
Institution
Keyword
Publication Year
File Type

Articles 24091 - 24120 of 25073

Full-Text Articles in Entire DC Network

Local Semigroups In Lie Groups And Locally Reachable Sets, Karl H. Hofmann, Jimmie D. Lawson Jan 1990

Local Semigroups In Lie Groups And Locally Reachable Sets, Karl H. Hofmann, Jimmie D. Lawson

Faculty Publications

In this paper the relationship between locally reachable sets for a fixed set of controls in the Lie algebra of a Lie group and the local semigroups generated by the corresponding one-parameter semigroup is considered. It is convenient to carry out the investigation in the Lie algebra itself, and the appropriate machinery for doing this is first developed. It is shown that local semigroups contain locally reachable sets. A general criterion (rerouting) is developed for the converse inclusion, and it is shown that if the set of controls is contained in a proper cone or is a Lie wedge (i.e., …

Go to article

A Characterization Of A Class Of Non-Binary Matroids, James G. Oxley Jan 1990

A Characterization Of A Class Of Non-Binary Matroids, James G. Oxley

Faculty Publications

A well-known result of Tutte is that U2,4, the 4-point line, is the only non-binary matroid M such that, for every element e, both Mβe and M e, the deletion and contraction of e from M, are binary. This paper characterizes those non-binary matroids M such that, for every element e, Mβe or M e is binary. © 1990.

Go to article

The Smallest Rounded Sets Of Binary Matroids, James G. Oxley, Talmage James Reid Jan 1990

The Smallest Rounded Sets Of Binary Matroids, James G. Oxley, Talmage James Reid

Faculty Publications

It was proved by Oxley that U2,4 is the only non-trivial 3-connected matroid N such that, whenever a 3-connected matroid M has an N-minor and x and y are elements of M, there is an N-minor of M using {x, y} . This paper establishes the corresponding result for binary matroids by proving that if M and N above must both be binary, then there are exactly two possibilities for N: the rank-three and rank-four wheels. © 1990, Academic Press Limited. All rights reserved.

Go to article

Comparison Of Ion-Selective Electrode Methods For Determining Potassium Q/I Relationships, Jian Wang, R. E. Farrell, A. D. Scott Jan 1990

Comparison Of Ion-Selective Electrode Methods For Determining Potassium Q/I Relationships, Jian Wang, R. E. Farrell, A. D. Scott

Faculty Publications

Different methods of determining quantity-intensity (Q/I) parameters with ion-selective electrodes (ISEs) were developed and evaluated with suspensions of three Iowa soils and a successive-additions method of varying the added K+. The ISE methods, which were categorized on the basis of the electrochemical cell involved, were tested for their applicability to soil suspensions. Specifically, single-ISE, dual-ISE, and triple-ISE methods were compared to ascertain the best means of determining the ΔK (gain or loss of dissolved K) and CR [concentration ratio: CK/(CCa+Mg)1/2] terms of the Q/I relationships. It was concluded that using the triple-ISE method offers the best means of carrying out …

Go to article

Videomicroscopic Comparison Of Bull Sperm And Leukocyte Chromosome Areas As Related To Gender, J. E. Chandler, V. Tirado, R. W. Adkinson Jan 1990

Videomicroscopic Comparison Of Bull Sperm And Leukocyte Chromosome Areas As Related To Gender, J. E. Chandler, V. Tirado, R. W. Adkinson

Faculty Publications

Chromosomal areas from metaphase spreads of male bovine leukocytes were digitized and sex chromosomes identified using videomicroscopy. Autosomal areas were ranked in descending order within a cell and assigned to two categories based on alternating rank. X and Y chromosome areas were assigned to respective categories. Areas were divided by 4 to make their sum equivalent to sperm DNA content. Data were analyzed before and after inclusion of sex chromosomal areas. Before X and Y inclusion, rank contributed to difference in chromosomal areas. Rank by category interaction and category effects did not contribute to area variation. After X and Y …

Go to article

Probing The Psychological Mystery Of Frankenstein, Paula R. Feldman Jan 1990

Probing The Psychological Mystery Of Frankenstein, Paula R. Feldman

Faculty Publications

No abstract provided.

Go to article

A Critique Of Justice Antonin Scalia's Approach To Fundamental Rights Adjudication, E. Gary Spitko Jan 1990

A Critique Of Justice Antonin Scalia's Approach To Fundamental Rights Adjudication, E. Gary Spitko

Faculty Publications

No abstract provided.

Go to article

Aliens--Immigration And Nationality Act--Foreign Logging Vessels' Crane Operators Are Not Alien Crewmen Entitled To Enter The United States Without Work Visas International Longshoremen's And Warehousemen's Union V. Meese, 833 F.2d 1443 (9th Cir. 1989), Sandee Magliozzi Jan 1990

Aliens--Immigration And Nationality Act--Foreign Logging Vessels' Crane Operators Are Not Alien Crewmen Entitled To Enter The United States Without Work Visas International Longshoremen's And Warehousemen's Union V. Meese, 833 F.2d 1443 (9th Cir. 1989), Sandee Magliozzi

Faculty Publications

No abstract provided.

Go to article

New Judgment Liens On Personal Property: Does "Efficient" Mean "Better"?, William J. Woodward Jr. Jan 1990

New Judgment Liens On Personal Property: Does "Efficient" Mean "Better"?, William J. Woodward Jr.

Faculty Publications

No abstract provided.

Go to article

Black African Literature In English, 1982-86, By Bernth Lindfors, Patrick G. Scott Jan 1990

Black African Literature In English, 1982-86, By Bernth Lindfors, Patrick G. Scott

Faculty Publications

A review of Bibliography of African Literature in English, 1982-86, compiled by Bernth Lindfors

Go to article

Teaching In A Liberal Arts College: How Foreign Language Courses Contribute To "Writing Across The Curriculum" Programs, Ilona Klein Jan 1990

Teaching In A Liberal Arts College: How Foreign Language Courses Contribute To "Writing Across The Curriculum" Programs, Ilona Klein

Faculty Publications

This essay shares some thoughts about the need for interaction between foreign language instructors and English teachers, both in high schools and at the university level. As a foreign language teacher for the past nine years (the last four in a liberal arts college), I have encountered several problems and difficulties that could be overcome, I believe, if English, Writing, and Foreign Language departments addressed them together. I do not claim to be able to give definite answers, since many pedagogical concepts concerting L2 acquisition/learning and their possible application to writing programs remain misunderstood or are presently debated by teacher …

Go to article

Deposition Of Zinc Selenide By Atomic Layer Epitaxy For Multilayer X-Ray Optics, J.K. Shurtleff, David D. Allred, R. T. Perkins, J. M. Thorne Jan 1990

Deposition Of Zinc Selenide By Atomic Layer Epitaxy For Multilayer X-Ray Optics, J.K. Shurtleff, David D. Allred, R. T. Perkins, J. M. Thorne

Faculty Publications

Thin film deposition techniques currently being used to produce multilayer x-ray optics (MXOs) have difficulty producing smooth, uniform multilayers with d-spacings less than about twelve angstroms. We are investigating atomic layer epitaxy (ALE) as an alternative to these techniques. ALE is a chemical vapor deposition technique which deposits an atomic layer of material during each cycle of the deposition process. The thickness of a film deposited by ALE depends only on the number of cycles. Multilayers deposited by ALE should be smooth and uniform with precise d-spacings which makes ALE an excellent technique for producing multilayer x-ray optics. We have …

Go to article

Photoconductive Characterization Of Znxcd1-Xte (0≤X≤0.25) Single Crystal Alloys, David D. Allred, Elías López-Cruz, Jesus González-Hernández, Worth P. Allred Jan 1990

Photoconductive Characterization Of Znxcd1-Xte (0≤X≤0.25) Single Crystal Alloys, David D. Allred, Elías López-Cruz, Jesus González-Hernández, Worth P. Allred

Faculty Publications

Large grain polycrystalline and single crystals of ZnxCd1-xTe grown by a modified Bridgman method were studied using the photoluminescence and photoconductivity techniques. The temperature dependence of the band gap, as determined by photoluminescence, follows the Varshni equation for measuring temperature in the range of 15-290 K. One of the fitted parameters, the Debye temperature, monotonically decreases with the increase of the atomic zinc concentration. A close correlation between the photoluminescence and photoconductivity measurements is also found. Samples in which the photoluminescence spectra exhibit emission bands associated to cadmium vacancies and other structural defects, show a photoresponse curve which includes, in …

Go to article

Distancing As A Casual Factor In The Development Of /0/ And /X/ In Spanish, David Eddington Jan 1990

Distancing As A Casual Factor In The Development Of /0/ And /X/ In Spanish, David Eddington

Faculty Publications

The evolution of the Spanish sibilant system has been an object of study since the late nineteenth century. Since that time, a myriad of books and articles have been published on the subject whose major focus has been to determine the exact nature of the sibilant changes and the chronology of each change. As is the case in most historical work, the question of why phonological systems evolve usually takes on only secondary importance. Among those theories proposed in order to explain why phonetic changes occur is the functionalist idea that there needs to be an optimal acoustic distance between …

Go to article

Accounting Tutor Platform, Rayman D. Meservy Jan 1990

Accounting Tutor Platform, Rayman D. Meservy

Faculty Publications

Many educational researchers consider computers to be the most important technological development for education since the invention of the printing press or writing itself. They believe that computers will one day transform education, leaving their mark on education as writing and books have done. Even though computer aided instruction (CAI} has been used for many years, results at the college level have been mixed, although generally moderately positive, sometimes reducing instructional time while increasing learning effectiveness. [Kulik, 1990]

Go to article

The Madaba Plains Project: Three Seasons Of Excavation At Tell El-`Umeiri And Vicinity, Jordan, Larry G. Herr, Lawrence T. Geraty, Oystein Labianca, Randall W. Younker Jan 1990

The Madaba Plains Project: Three Seasons Of Excavation At Tell El-`Umeiri And Vicinity, Jordan, Larry G. Herr, Lawrence T. Geraty, Oystein Labianca, Randall W. Younker

Faculty Publications

No abstract provided.

Go to article

The Costs Of Settlement: The Impact Of Scarcity Of Adjudication On Litigating Lawyers, Kevin C. Mcmunigal Jan 1990

The Costs Of Settlement: The Impact Of Scarcity Of Adjudication On Litigating Lawyers, Kevin C. Mcmunigal

Faculty Publications

This Article, by comparison, focuses on the implications of lack of trial experience for litigating lawyers. Does lack of trial experience affect the way lawyers function in litigation? Does it influence their performance as advocates? As negotiators settling cases? Does it affect adherence to existing ethical standards such as those regarding competence and conflict of interest? Can one expect lawyers to understand, respect, and adhere to the values of an ethical and legal system premised, as ours is, upon a process of adjudication lawyers seldom, if ever, experience? Do the answers to these questions yield any insight for guiding reform …

Go to article

The Exclusion Of Evidence In The United States, Paul Marcus Jan 1990

The Exclusion Of Evidence In The United States, Paul Marcus

Faculty Publications

No abstract provided.

Go to article

Time To Abolish Implied Assumption Of A Reasonable Risk In California, Stephanie M. Wildman, John C. Barker Jan 1990

Time To Abolish Implied Assumption Of A Reasonable Risk In California, Stephanie M. Wildman, John C. Barker

Faculty Publications

No abstract provided.

Go to article

Meditations On Being Good, Margalynne J. Armstrong Jan 1990

Meditations On Being Good, Margalynne J. Armstrong

Faculty Publications

No abstract provided.

Go to article

Easing Transfer And Security Interest Transactions In Intellectual Property: An Agenda For Reform, William J. Woodward Jr., Harold R. Weinberg Jan 1990

Easing Transfer And Security Interest Transactions In Intellectual Property: An Agenda For Reform, William J. Woodward Jr., Harold R. Weinberg

Faculty Publications

No abstract provided.

Go to article

One State's Answer To The Ucc Article 9 Trade Name Issue And A Glimpse At The Non-Uniform Amendment Process, William J. Woodward Jr., Alvin C. Harrell Jan 1990

One State's Answer To The Ucc Article 9 Trade Name Issue And A Glimpse At The Non-Uniform Amendment Process, William J. Woodward Jr., Alvin C. Harrell

Faculty Publications

No abstract provided.

Go to article

Congress Shall Make No Law: Oliver Wendell Holmes, The First Amendment, And Judicial Decision Making, Patrick Garry Jan 1990

Congress Shall Make No Law: Oliver Wendell Holmes, The First Amendment, And Judicial Decision Making, Patrick Garry

Faculty Publications

No abstract provided.

Go to article

Rheology Of Aqueous Suspensions Of Polystyrene Latex Stabilized By Grafted Poly(Ethylene Oxide), Harry J. Ploehn, J. W. Goodwin Jan 1990

Rheology Of Aqueous Suspensions Of Polystyrene Latex Stabilized By Grafted Poly(Ethylene Oxide), Harry J. Ploehn, J. W. Goodwin

Faculty Publications

A water-soluble carbodiimide has been used to end-graft aminated poly (ethylene oxide)(PEO) chemically onto colloidal polystyrene particles. Two particle sizes (115 and 347 nm diameter) and two PEO molecular weights (112 000 and 615 000 g mol–1) were combined to give suspensions with four different ratios of polymer layer thickness to particle radius. Electrophoresis demonstrated that the PEO was grafted, not just adsorbed. Dynamic light scattering showed that the adsorbed and grafted layers had similar structures and that non-ionic surfactant perturbed the PEO configurations. Steady shear and oscillatory rheometry indicated that long-ranged polymeric forces between particles governed the …

Go to article

A Simple Model For A Zinc/Bromine Flow Cell And Associated Storage Tanks, G. D. Simpson, Ralph E. White Jan 1990

A Simple Model For A Zinc/Bromine Flow Cell And Associated Storage Tanks, G. D. Simpson, Ralph E. White

Faculty Publications

A simple model for a parallel plate, zinc/bromine flow cell and associated storage tanks is presented and used to make time-dependent predictions for various quantities in the system. The model is based on a previously published algebraic model of the cell at steady-state and time-dependent, first-order differential equations for the storage tanks. The Butler-Volmer equation is used for the electrochemical reactions, and the homogeneous reaction between bromine and bromide is included. The model predictions indicate that the charging operation of a zinc/bromine battery can be significantly improved by using a storage tank with a larger residence time for the bromine …

Go to article

Mathematical Modeling Of An H2s Removal Electrolyzer, Z. Mao, P. Adanuvor, Ralph E. White Jan 1990

Mathematical Modeling Of An H2s Removal Electrolyzer, Z. Mao, P. Adanuvor, Ralph E. White

Faculty Publications

A mathematical model is presented for a high temperature H2S electrolyzer. It is shown that the maximum current in this type of a cell is determined entirely by the transport rate of sulfide ions through the separator. It is suggested that this model could be used to determine the feasibility of various designs for this electrolyzer.

Go to article

Electrochemical Behavior Of Graphite And Ni-Cr Electrodes In Sodium Polysulfide In The Absence And Presence Of Hydrogen Sulfide, Z. Mao, Ralph E. White, B. Dandapani, A. Anani, S. Srinivasan, A. J. Appleby Jan 1990

Electrochemical Behavior Of Graphite And Ni-Cr Electrodes In Sodium Polysulfide In The Absence And Presence Of Hydrogen Sulfide, Z. Mao, Ralph E. White, B. Dandapani, A. Anani, S. Srinivasan, A. J. Appleby

Faculty Publications

The electrochemical behavior of graphite and Ni-Cr electrodes in sodium tetrasulfide melt has been investigated using voltammetric, chronoamperometric, and chronopotentiometric techniques in the presence and absence of hydrogen sulfide. Two continuous phases, namely, Na2S2 and Na2S, are apparently formed at different potentials during the cathodic polarization. The blocking effect by these layers was much less significant on the Ni-Cr electrode than on graphite. The presence of H2S did not appear to influence the electrode reactions, but it significantly reduced the rate of formation of the continuous phases (Na2S2 or Na …

Go to article

A Computer Simulation Of The Oxygen Reduction Reaction In Carbonate Melts, P. K. Adanuvor, Ralph E. White, A. J. Appleby Jan 1990

A Computer Simulation Of The Oxygen Reduction Reaction In Carbonate Melts, P. K. Adanuvor, Ralph E. White, A. J. Appleby

Faculty Publications

A computer simulation of the oxygen reduction reaction in various carbonate melts has been carried out under steady-state conditions on the basis of a proposed kinetic model which takes into consideration the autocatalytic reaction involving oxygen and other reducible oxygen species in the melt, and the neutralization of oxide ions by dissolved carbon dioxide. A simulation of the presence of (physically) dissolved oxygen, in the diffusion layer region of the melt, corresponding to the possible situation in porous electrodes, causes a significant enhancement in the polarization curves, particularly in the mass-transfer control region. On the other hand, high levels of …

Go to article

Estimation Of The Diffusion Coefficient And Solubility For A Gas Diffusing Through A Membrane, Michael C. Kimble, Ralph E. White, Yu-Min Tsou, R. Neal Beaver Jan 1990

Estimation Of The Diffusion Coefficient And Solubility For A Gas Diffusing Through A Membrane, Michael C. Kimble, Ralph E. White, Yu-Min Tsou, R. Neal Beaver

Faculty Publications

Analysis of the data obtained by the electrochemical monitoring technique for diffusion of a gas through a membrane is considered. It is shown that combining a numerical method with a nonlinear parameter estimation technique provides a means to determine values for the diffusion coefficient and the solubility of the diffusing gas. It is shown that better accuracy can be obtained for the diffusion coefficient and solubility of this gas by using the method presented and all experimental data rather than only part of the data, as has often been done in the past.

Go to article

A New Perspective On The "Depriest Tea" Historiographic Controversy: Mrs. Lou Henry Hoover’S Papers, David Day Jan 1990

A New Perspective On The "Depriest Tea" Historiographic Controversy: Mrs. Lou Henry Hoover’S Papers, David Day

Faculty Publications

No abstract provided.

Go to article

First Prev Next Last