Digital Commons Network^™

Molecular Diversity, Structure And Domestication Of Grasses, Edward S. Buckler Iv, Jeffry M. Thornsberry, Stephen Kresovich

Faculty Publications

Over the last 10,000 years, crop domestication has been the single most important human cultural development. Grasses are prominent among these crops, and provide the vast majority of the world's food. Similar traits have been selected during the domestication and breeding of these critically important grasses, and since they share a similar complement of genes, the same set of genes may have been selected. Even though the process of domestication occurred over the same 5000 to 10,000 year period, the domesticated grasses have major differences in genome structure, diversity, and life history. Molecular investigations of grass domestication have succeeded in …

Cooperative Control Of Uav Rendezvous, Timothy W. Mclain, Phillip R. Chandler, Steven Rasmussen, Meir Pachter

Faculty Publications

The cooperative control of timing and synchronization of tasks of multiple unmanned air vehicles (UAVs) represents a valuable capability for a wide range of potential multi-UAV missions. This research addresses the specific problem of cooperative rendezvous in which multiple UAVs are to arrive at their targets simultaneously. The development of a rendezvous manager state machine and a cooperative control decomposition approach are described. Simulation results demonstrating the feasibility of the approach are presented.

Comparative Phylogeography Of Mesoamerican Highland Rodents: Concerted Versus Independent Response To Past Climatic Fluctuations, Duke S. Rogers, Jack Sullivan, Elizabeth Arellano

Faculty Publications

The phylogeography of Sumichrast's harvest mouse (Reithrodontomys sumichrasti) was examined through maximumlikelihood and parsimony analyses of 1,130 bp of mitochondrial Cytochrome b sequence data from 43 individuals. The phylogeography of this Middle American highland forest-dwelling species was compared to that previously published for the codistributed Aztec deer mouse complex (Peromyscus aztecus/Peromyscus hylocetes complex) in order to test competing hypotheses of concerted versus independent responses of codistributed forms to past climatic fluctuations. Qualitatively, there were strong similarities in the phylogeographic patterns of the two groups, yet there were also areas of incongruence. Likelihood-ratio tests (Kishino-Hasegawa-Templeton and parametric bootstrap tests) indicated that …

The Wages Of Affluence: Labor And Management In Postwar Japan, By Andrew Gordon, William Dean Kinzley

Faculty Publications

A review of The Wages of Affluence: Labor and Management in Postwar Japan, by Andrew Gordon

Archaeobotanical Evidence For Pearl Millet (Pennisetum Glaucum) In Sub-Saharan West Africa, A. C. D'Andrea, M. Klee, Joanna Casey

Faculty Publications

Examines the association of domesticated pearl millet recovered at the archaeological site of Birimi in northern Ghana with the Kintampo cultural complex. Description of the Birimi site; Identifications of the Birimi pearl millet specimens; Features of the Birimi pearl millet.

Restoration Of Fish Habitat In The Provo River: A Multispecies Approach, Mark C. Belk

Faculty Publications

Historically, the Provo river, located in Utah and Wasatch Cos., Utah, was a clear-flowing stream with headwaters in the western edge of the Uinta mountains that emptied into Utah Lake near Provo, Utah. The river had a wide flood plain and a braided channel, especially in the Heber valley and Utah valley areas. Diversion of water and construction of water storage facilities began in the late 1800's and intensified in the 1900's. Deer Creek reservoir was built in the 1950's and diking and channelization continued until the construction of Jordanelle reservoir in the late 1980's. The Provo River Restoration Project, …

Parenting Stress In Families With Children With Disabilities, Timothy B. Smith, Matthew N. I. Oliver, Mark S. Innocenti

Faculty Publications

Parenting stress is an important variable to consider in families with children with disabilities. This study evaluated 880 such families, using measures of child and family functioning. Results suggest that factors such as income, time available for interaction with the child, and social support predict parenting stress much better than do aspects of child functioning.

The Uniform Health-Care Decisions Act And Its Progress In The States, David M. English

Faculty Publications

Over the past decade, planning for health care decision making through the making of an advance directive has become a routine part of personal counseling. Public interest in the subject has been fueled by well-publicized cases such as Cruzan v. Director, Missouri Department of Health, 497 U.S. 261 (1990). In response to this interest, most states authorize their citizens to make at least one form of advance directive: all states statutorily authorize powers of attorney for health care, and all but Massachusetts, Michigan and New York authorize living wills. State legislation has been a mixed blessing. Although intended to facilitate …

Interpolating Implicit Surfaces From Scattered Surface Data Using Compactly Supported Radial Basis Functions, Bryan S. Morse, David T. Chen, Penny Rheingans, Kalpathi Subramanian, Terry S. Yoo

Faculty Publications

We describe algebraic methods for creating implicit surfaces using linear combinations of radial basis interpolants to form complex models from scattered surface points. Shapes with arbitrary topology are easily represented without the usual interpolation or aliasing errors arising from discrete sampling. These methods were first applied to implicit surfaces by Savchenko, et al. and later developed independently by Turk and O'Brien as a means of performing shape interpolation. Earlier approaches were limited as a modeling mechanism because of the order of the computational complexity involved. We explore and extend these implicit interpolating methods to make them suitable for systems of …

Effective Bandwidth For Traffic Engineering, Mark J. Clement, Rob Kunz, Seth Nielson, Quinn O. Snell

Faculty Publications

In today’s Internet, demand is increasing for guarantees of speed and efficiency. Current routers are very limited in the type and quantity of observed data they can provide, making it difficult for providers to maximize utilization without the risk of degraded throughput. This research uses statistical data currents provided by router vendors to estimate the impact of changes in network configuration on the probability of link overflow. This allows service providers to calculate in advance, the effect of grooming on a network, eliminating the conservative trial-and-error approach normally used. These predictions are made using Large Deviation Theory, which focuses on …

Annotated Bibliography Of Research In The Teaching Of English, Deborah Brown, Judy Kalman, Ad Stinson, Me Whiting

Faculty Publications

Twice a year, in the May and November issues, RTE publishes a selected bibliography of recent research in the reaching of English. Most of the studies appeared during the six-month period preceding the compilation of the bibliography (June through December, 2000,for the present bibliography), but some studies that appeared earlier are occasionally included. The listing is selective; we make no attempt to include all research and research-related articles that appeared in the period under review. Comments on the bibliography and suggestions about items for inclusion may be directed to the bibliography editors. We encourage you to send your suggestions to …

Image Reconstruction Using Data-Dependent Triangulation, Thomas W. Sederberg, Xiaohua Yu, Bryan S. Morse

Faculty Publications

Image reconstruction based on data-dependent triangulation with new cost functions and optimization can create higher quality images than traditional bilinear or bicubic spline reconstruction. The article presents a novel method for image reconstruction using a piecewise linear intensity surface whose elements don't generally align with the coordinate axes. This method is based on the technique of data-dependent triangulation (DDT) that N. Dyn et al. (1990) introduced and has proven capable of producing more pleasing reconstructions than axis-aligned methods.

Very-Low-Specific-Resistance Pd/Ag/Au/Ti/Au Alloyed Ohmic Contact To P Gan For High-Current Devices, V. Adivarahan, A. Lunev, M. Asif Khan, J. Yang, Grigory Simin, M. S. Shur, R. Gaska

Faculty Publications

We report on Pd/Ag/Au/Ti/Au alloyed metallic contact to pGaN. An 800 °C anneal for 1 min in flowing nitrogen ambient produces an excellent ohmic contact with a specific contact resistivity close to 1×10⁻⁶ Ω cm² and with good stability under high current operation conditions. This high-temperature anneal forms an alloy between Ag,Au, and pGaN resulting in a highly p-doped region at the interface. Using x-ray photoelectron spectroscopy and x-ray diffractionanalysis, we confirm that the contact formation mechanism is the metal intermixing and alloying with the semiconductor.

What Determines The Emission Peak Energy Of The Blue Luminescence In Highly Mg-Doped P-Gan?, John S. Colton, P. Y. Yu

Faculty Publications

We report a study of the 2.8 eV blue luminescence (BL) in heaviliy Mg-doped p-GaN via resonant excitation with a tunable blue dye laser. The dependence of the BL on the excitation photon energy (Eex) is unlike that of the yellow luminescence found in n-type GaN. An Urbach-type band tail, with Urbach parameter of 33 meV is observed in the vicinity of the BL energy. We propose that the peak energy of the BL marks the transition from localized states to delocalized states within this band tail.

Formation Of Rydberg Atoms In An Expanding Ultracold Neutral Plasma, Scott D. Bergeson, T. C. Killian, M. J. Lim, S. Kulin, R. Dumke, S. L. Rolston

Faculty Publications

We study the formation of Rydberg atoms in expanding plasmas at temperatures of 1–1000 K and densities from 10^5–10^10 cm^-3. Up to 20% of the initially free charges recombine in about 100 us, and the binding energy of the Rydberg atoms approximately equals the increase in the kinetic energy of the remaining free electrons. Three-body recombination is expected to dominate in this regime, yet most of our results are inconsistent with this mechanism.

Blowup In A Mass-Conserving Convection-Diffusion Equation With Superquadratic Nonlinearity, Todd L. Fisher, Christopher P. Grant

Faculty Publications

A nonlinear convection-diffusion equation with boundary conditions that conserve the spatial integral of the solution is considered. Previous results on nite-time blowup of solutions and on decay of solutions to the corresponding Cauchy problem were based on the assumption that the nonlinearity obeyed a power law. In this paper, it is shown that assumptions on the growth rate of the nonlinearity, which take the form of weak superquadraticity and strong superlinearity criteria, are suffcient to imply that a large class of nonnegative solutions blow up in nite time.

Mechanism Of Radio-Frequency Current Collapse In Gan-Algan Field-Effect Transistors, A. Tarakji, Grigory Simin, N. Ilinskaya, X. Hu, A. Kumar, A. Koudymov, J. Yang, M. Asif Khan, M. S. Shur, R. Gaska

Faculty Publications

The mechanism of radio-frequency current collapse in GaN–AlGaN heterojunctionfield-effect transistors(HFETs) was investigated using a comparative study of HFET and metal–oxide–semiconductor HFET current–voltage (I–V) and transfer characteristics under dc and short-pulsed voltage biasing. Significant current collapse occurs when the gate voltage is pulsed, whereas under drain pulsing the I–V curves are close to those in steady-state conditions. Contrary to previous reports, we conclude that the transverse electric field across the wide-band-gap barrier layer separating the gate and the channel rather than the gate or surface leakage currents or high-field effects in the gate–drain spacing is responsible for the current collapse. We …

Determination Of An Ethane Intermolecular Potential Model For Use In Molecular Simulations From Ab Initio Calculations, Richard L. Rowley, Tapani A. Pakkanen, Yan Yang

Faculty Publications

Counterpoise-corrected, supermolecule, ab initio energies obtained at the MP2/6-311+G(3df, 2pd) level were computed for 22 different relative orientations of two ethane molecules as a function of the separation distance between the molecular centers. These energies were used to regress the parameters in several simple, analytical, interatomic or site-site models that can be used for implementation in molecular simulations. Sensitivity analysis indicated that the inter molecular potential surface is insensitive to the C-C interactions and that the parameters in the C-C model are coupled and unobtainable from the dimer energies. Representation of the potential surface can be made in terms of …

Crumbs For Oliver Twist: Resolving The Conflict Between Tax And Support Claims In Bankruptcy, Michelle A. Cecil

Faculty Publications

This article is premised on the assumption that the congressional goal of preferring support claims over federal income tax claims is indeed a laudable one, based on three interrelated policy justifications. First, support claimants are unable to spread their risk of loss like the government is able to do by raising tax rates or increasing tax revenue from other sources. As three prominent bankruptcy scholars noted in their recent study of consumer bankruptcy entitled The Fragile Middle Class: Americans in Debt:

Relationships Among The Non-Byzantine Manuscripts Of 2 Peter, Terry Dwain Robertson

Faculty Publications

One of the ongoing discussions in NT text-critical studies involves the methodology for classifying manuscripts into families and text-types.' This study focuses on the text of 2 Peter, following a three-step method. First, all the manuscripts in the study were compared and tentatively grouped through hierarchical cluster analysis. Next, based on these tentative groupings, profiles of non-majority text readings were created. Then, working with and refining these profiles, the groupings were finalized. A short profile of test readings is also provided for each group to aid in the quick identification of other manuscripts. With the groupings in hand, the next …

History And Interpretation Of The Great Case Of Johnson V. M'Intosh, Eric Kades

Faculty Publications

No abstract provided.

Court Administration As A Tool For Judicial Reform, Christie S. Warren

Faculty Publications

This paper focuses on court administration as a component of judicial branch reform in the United States and other countries.

Over the past fifty years, state and federal court systems in the United States have undergone a process of significant change. At the beginning of the twentieth century, courts were largely dependent upon the executive branch of government for administrative support and were for the most part externally dominated, disorganized, and poorly managed. By the end of the century, they had undergone a process of administrative innovation and improvement that changed the way they were managed. In other countries, judicial …

Craftcambro-Latin Compositions: Their Competence And Craftsmanship, Scott Gwara

Faculty Publications

No abstract provided.

The Copyrightability Of New Works Of Authorship: 'Xml Schemas' As An Example, I. Trotter Hardy

Faculty Publications

No abstract provided.

Duty Rules, David G. Owen

Faculty Publications

No abstract provided.

Social Influence On Paranormal Beliefs, Barry N. Markovsky, Shane R. Thye

Faculty Publications

In spite of strong public expressions of skepticism from the scientific community, polls show that more than nine out of ten American adults profess belief in paranormal phenomena. Some scientists view this as a social problem, directing much blame (but little research) at a variety of sources including lack of critical thinking skills, fads, need for transcendent experiences, failure of the educational system, and cultural cycles. Social impact theory provides an alternative focus: it views paranormal beliefs as a natural consequence of social influence processes in interpersonal settings. In this study, subjects in a laboratory experiment were informed that some …

Public Trust & Distrust: Theoretical Implications Of The Public Trust Doctrine For Natural Resource Management, Erin Ryan

Faculty Publications

This Comment reviews the theoretical underpinnings of the public trust, a doctrine originating in Roman common law and now constitutionalized by many states, and explores its contentious reception by green legal theorists. Since Professor Joseph Sax's revival of the doctrine as a vehicle for environmental legal advocacy in the early 1970s, it has been haJled by many. as the most powerful tool available for protecting natural resource commons and attacked by others who argue that use of the property rights-based doctrine will reify an ownership approach to natural resources and obstruct the development of more stewardship-oriented legal theories of natural …

Appraising Industrial Special-Purpose Properties, Robert G. Crawford, Barrett A. Slade

Faculty Publications

This article proposes a new technique, based on utilization rates, for estimating economic obsolescence in the appraisal of industrial special-purpose properties. A utilization-based measure, which explicitly considers the operating leverage of the facility, allows for proper calculation of the obsolescence. Theoretically correct valuation principles underlie the proposed utilization methodology. The technique uses inputs that are reasonably available to an appraiser, thus providing a practical application of the proposed methodology.

Simultaneous Capture And Mineralization Of Coal Combustion Flue Gas Carbon Dioxide (Co2), Morris D. Argyle, Katta J. Reddy, Sanil John, Hollis Weber, Pradip Bhattacharyya, David T. Taylor, Mikol Christensen, Thomas Foulke, Paul Fahlsing

Faculty Publications

The mineral carbonation, a process of converting CO2 into stable minerals (mineralization), has been studied extensively to capture and store CO2. However, most of the mineral carbonation studies have been largely investigated at lab scale. Preliminary and pilot scale studies for accelerated mineral carbonation (AMC) were conducted at one of the largest coal-fired power plants (2120 MW) in the USA by reacting flue gas with fly ash particles in a fluidized bed reactor. In the preliminary experiments, flue gas CO2 and SO2 concentrations decreased from 13.0 to 9.6% and from 107.8 to 15.1 ppmv, respectively during the first 2 min. …

War, Society, And Disability: Some Thoughts On Applying Under-Utilized Methodologies, Michael Ashley Stein

Faculty Publications

No abstract provided.