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Enigmatic Phylogeny Of Skuas: An Alternative Hypothesis, M. J. Braun, R. T. Brumfield Jun 1998

Enigmatic Phylogeny Of Skuas: An Alternative Hypothesis, M. J. Braun, R. T. Brumfield

Faculty Publications

Last year, Cohen et al. presented molecular data suggesting the surprising result that both currently recognized genera of skuas, Stercorarius and Catharacta (Aves: Stercorariidae), are not monophyletic. However, the most enigmatic conclusion from their analysis, that S. pomarinus is sister to C. skua, rests solely on mtDNA sequence data. When the mtDNA data are analysed in a maximum likelihood framework that accounts for variation in evolutionary rates, Catharacta monophyly cannot be rejected. None of the best trees that can be derived from two nuclear data sets of Cohen et al. support the controversial pomarinus-C. skua node. We propose an alternative …


Mortality Data For Sub-Saharan Africa [10], R. S. Cooper, C. Rotimi, J. Kaufman, T. Lawoyin Jun 1998

Mortality Data For Sub-Saharan Africa [10], R. S. Cooper, C. Rotimi, J. Kaufman, T. Lawoyin

Faculty Publications

No abstract provided.


Parallel Linear Congruential Generators With Prime Moduli, Michael Mascagni Jun 1998

Parallel Linear Congruential Generators With Prime Moduli, Michael Mascagni

Faculty Publications

Linear congruential generators (LCGs) remain the most popular method of pseudorandom number generation on digital computers. Ease of implementation has favored implementing LCGs with power-of-two moduli. However, prime modulus LCGs are superior in quality to power-of-two modulus LCGs, and the use of a Mersenne prime minimizes the computational cost of generation. When implemented for parallel computation, quality becomes an even more compelling issue. We use a full-period exponential sum as the measure of stream independence and present a method for producing provably independent streams of LCGs in parallel by utilizing an explicit parameterization of all of the primitive elements module …


The Effect Of Convection On A Propagating Front With A Liquid Product: Comparison Of Theory And Experiments, B. Mccaughey, John A. Pojman, C. Simmons, V.A. Volpert Jun 1998

The Effect Of Convection On A Propagating Front With A Liquid Product: Comparison Of Theory And Experiments, B. Mccaughey, John A. Pojman, C. Simmons, V.A. Volpert

Faculty Publications

This work is devoted to the investigation of propagating polymerization fronts converting a liquid monomer into a liquid polymer. We consider a simplified mathematical model which consists of the heat equation and equation for the depth of conversion for one-step chemical reaction and of the Navier-Stokes equations under the Boussinesq approximation. We fulfill the linear stability analysis of the stationary propagating front and find conditions of convective and thermal instabilities. We show that convection can occur not only for ascending fronts but also for descending fronts. Though in the latter case the exothermic chemical reaction heats the cold monomer from …


Development And Testing Of A Quantitative Food Frequency Questionnaire For Use In Kerala, India, James R. Hébert, Prakash C. Gupta, Ramesh B. Bhonsle, P. R. Murti, Hemali Mehta, Florence Verghese, Mira Aghi, Kamala Krishnaswamy, Fali S. Mehta Jun 1998

Development And Testing Of A Quantitative Food Frequency Questionnaire For Use In Kerala, India, James R. Hébert, Prakash C. Gupta, Ramesh B. Bhonsle, P. R. Murti, Hemali Mehta, Florence Verghese, Mira Aghi, Kamala Krishnaswamy, Fali S. Mehta

Faculty Publications

Objective: To develop and test a food frequency questionnaire (FFQ) for use in rural areas of Kerala, India. Design: Based on food use and market surveys of the study area, a quantitative 81- item interviewer-administered FFQ was developed. A validation study was conducted consisting of 24-h diet recalls (24HR) administered on 8 days randomly selected over an entire year and two administrations of the FFQ, one at the beginning of the l-year period and the other at the end. FFQ and 24HR-derived nutrient scores were compared using correlation and regression analyses and by examining differences in the nutrient scores. Setting: …


Photochemical Production And Loss Rates Of Ozone At Sable Island, Nova Scotia During The North Atlantic Regional Experiment (Nare) 1993 Summer Intensive, Katharine A. Duderstadt, M. A. Carroll, S. Sillman, T. Wang, G. M. Albercook, L. Feng, D. D. Parrish, J. S. Holloway, F. C. Fehsenfeld, Donald R. Blake, N. J. Blake, G. Forbes Jun 1998

Photochemical Production And Loss Rates Of Ozone At Sable Island, Nova Scotia During The North Atlantic Regional Experiment (Nare) 1993 Summer Intensive, Katharine A. Duderstadt, M. A. Carroll, S. Sillman, T. Wang, G. M. Albercook, L. Feng, D. D. Parrish, J. S. Holloway, F. C. Fehsenfeld, Donald R. Blake, N. J. Blake, G. Forbes

Faculty Publications

Three weeks of summertime surface‐based chemical and meteorological observations at Sable Island, Nova Scotia during the North Atlantic Regional Experiment (NARE) 1993 summer intensive are used to study instantaneous photochemical production and loss rates of ozone by means of a numerical photochemical model. Results are most sensitive to the averaging scheme of data used to constrain the model and the ambient variability of the measurements. Model simulations driven by a time series of 5 min averaged data, most representative of the chemistry at the site, yield an average net photochemical ozone production of 3.6 ppbv/d. Estimates of net ozone production …


Fuel Equalized Retargeting For Separated Spacecraft Interferometry, Timothy Mclain, Randal W. Beard, Fred Y. Hadaegh Jun 1998

Fuel Equalized Retargeting For Separated Spacecraft Interferometry, Timothy Mclain, Randal W. Beard, Fred Y. Hadaegh

Faculty Publications

Motivated by NASA's proposed Deep Space 3 interferometer mission, the paper considers the problem of reorienting a constellation of spacecraft such that the total fuel distributed across the constellation is both conserved and expended uniformly. The spacecraft constellation is controlled to reorient as if it were a rigid body. Two approaches to fuel equalization are investigated. The first approach picks a point of rotation a priori that optimizes an objective function that trades off minimum-fuel maneuvers and maneuvers that equalize the fuel. Since the point of rotation is selected a priori and is fixed during the rotation, this approach is …


A Practical Algorithm For Designing H∞ Control Laws, Timothy Mclain, Randal W. Beard Jun 1998

A Practical Algorithm For Designing H∞ Control Laws, Timothy Mclain, Randal W. Beard

Faculty Publications

We describe an approximation method for the Hamilton-Jacobi-Isaacs (HJI) equation that results in feedback control. The approximation is accomplished via a two-step successive Galerkin approximation scheme. An application of the technique to the control of the forward motion of an underwater vehicle is described.


Ecosystem Responses To Internal And Watershed Organic Matter Loading: Consequences For Hypoxia In The Eutrophying Neuse River Estuary, North Carolina, Usa, Hans W. Paerl, James L. Pinckney, John M. Fear, Benjamin L. Peierls May 1998

Ecosystem Responses To Internal And Watershed Organic Matter Loading: Consequences For Hypoxia In The Eutrophying Neuse River Estuary, North Carolina, Usa, Hans W. Paerl, James L. Pinckney, John M. Fear, Benjamin L. Peierls

Faculty Publications

The contrasting impacts of externally supplied (runoff) and internally generated (nutrient stimulated phytoplankton blooms) organic matter on oxygen (02) depletion were examined and evaluated in the eutrophic, salinity-stratified Neuse River Estuary, North Carolina, USA. This nitrogen (N)- limited estuary is experiencing increasing anthropogenic N loading from expanding urban, agricultural and industrial development in its watershed. Resultant algal blooms, which provided organic matter loads capable of causing extensive low 02 (hypoxic) and depleted 02 (anoxic) conditions, have induced widespread mortality of resident fin- and shellfish. Phytoplankton blooms followed periods of elevated N loading, except during extremely high …


Search For A New Gauge Boson In Π0 Decays, Nomad Collaboration, J. Altegoer, D. Autiero, A. Baldisseri, M. Baldo-Ceolin, G. Ballocchi, M. Banner, S. Basa, G. Bassompierre, K. Benslama, N. Besson, I. Bird, B. Blumenfeld, F. Bobisut, J. Bouchez, S. Boyd, A. Bueno, S. Bunyatov, L. Camilleri, K. Zuber, Roberto Petti, Et. Al. May 1998

Search For A New Gauge Boson In Π0 Decays, Nomad Collaboration, J. Altegoer, D. Autiero, A. Baldisseri, M. Baldo-Ceolin, G. Ballocchi, M. Banner, S. Basa, G. Bassompierre, K. Benslama, N. Besson, I. Bird, B. Blumenfeld, F. Bobisut, J. Bouchez, S. Boyd, A. Bueno, S. Bunyatov, L. Camilleri, K. Zuber, Roberto Petti, Et. Al.

Faculty Publications

A search was made for a new light gauge boson X which might be produced in π0→γ+X decay from neutral pions generated by 450 GeV protons in the CERN SPS neutrino target. The X's would penetrate the downstream shielding and be observed in the NOMAD detector via the Primakoff effect, in the process of X→π0 conversion in the external Coulomb field of a nucleus. With 1.45×1018 protons on target, 20 candidate events with energy between 8 and 140 GeV were found from the analysis of neutrino data. This number is in …


Major Histocompatibility Complex Class I- And Ii-Deficient Knock-Out Mice Are Resistant To Primary But Susceptible To Secondary Eimeria Papillata Infections, Marco L. Schito, Bill Chobotar, John R. Barta May 1998

Major Histocompatibility Complex Class I- And Ii-Deficient Knock-Out Mice Are Resistant To Primary But Susceptible To Secondary Eimeria Papillata Infections, Marco L. Schito, Bill Chobotar, John R. Barta

Faculty Publications

Two distinct mechanisms seem to function in reducing oocyst output during Eimeria papillata infections in mice. For naive mice, immunity was afforded by a T-cell-independent gamma-interferon (IFN-γ) response mediated by natural killer (NK) cells. On reinfection, resistance was associated with T-cells and, to a lesser extent, perforin. To determine if antigen presentation with major histocompatibility complex (MHC) molecules was required to control oocyst production by NK cells during primary infection or by T-cells during secondary infection, mutant mice that lacked H2-IAβb (Aβb(-/-)) or β2-microglobulin (β2m(-/-)) were used. Since MHC molecules are required for the maturation of αβ T-cells, Aβb(-/-) and …


Quantum Associative Memory With Exponential Capacity, Tony R. Martinez, Dan A. Ventura May 1998

Quantum Associative Memory With Exponential Capacity, Tony R. Martinez, Dan A. Ventura

Faculty Publications

Quantum computation uses microscopic quantum level effects to perrform computational tasks and has produced results that in some cases are exponentially faster than their classical counterparts by taking advantage of quantum parallelism. The unique characteristics of quantum theory may also be used to create a quantum associative memory with a capacity exponential in the number of neurons. This paper covers necessary high-level quantum mechanical ideas and introduces a simple quantum associative memory. Further, it provides discussion, empirical results and directions for future work.


Constructing High Order Perceptrons With Genetic Algorithms, Timothy L. Andersen, Tony R. Martinez May 1998

Constructing High Order Perceptrons With Genetic Algorithms, Timothy L. Andersen, Tony R. Martinez

Faculty Publications

Constructive induction, which is defined to be the process of constructing new and useful features from existing ones, has been extensively studied in the literature. Since the number of possible high order features for any given learning problem is exponential in the number of input attributes (where the order of a feature is defined to be the number of attributes of which it is composed), the main problem faced by constructive induction is in selecting which features to use out of this exponentially large set of potential features. For any feature set chosen the desirable characteristics are minimality and generalization …


Optimal Control Using A Neural/Evolutionary Hybrid System, Tony R. Martinez, Dan A. Ventura May 1998

Optimal Control Using A Neural/Evolutionary Hybrid System, Tony R. Martinez, Dan A. Ventura

Faculty Publications

One of the biggest hurdles to developing neurocontrollers is the difficulty in establishing good training data for the neural network. We propose a hybrid approach to the development of neurocontrollers that employs both evolutionary computation (EC) and neural networks (NN). EC is used to discover appropriate control actions for specific plant states. The survivors of the evolutionary process are used to construct a training set for the NN. The NN leams the training set, is able to generalize to new plant states, and is then used for neurocontrol. Thus the EC/NN approach combines the broad, parallel search of EC with …


Inelastic Yielding And Forebulge Shape Across A Modern Foreland Basin: North West Shelf Of Australia, Timor Sea, Juan M. Lorenzo, Geoffrey W. O'Brien, Jonathan Stewart, Kush Tandon May 1998

Inelastic Yielding And Forebulge Shape Across A Modern Foreland Basin: North West Shelf Of Australia, Timor Sea, Juan M. Lorenzo, Geoffrey W. O'Brien, Jonathan Stewart, Kush Tandon

Faculty Publications

The Timor Trough is a modern `underfilled' foreland and basin created by partial subduction of the outer north west continental shelf of Australia beneath Timor Island in the Outer Banda Arc of eastern Indonesia during the Cenozoic. A change of the effective elastic thickness (EET) of the continental foreland lithosphere from approximately 80±20 km to approximately 25 km over a distance of approximately 300 km explains (1) the high curvature (approximately 10-7 m-1) on the outer Trough wall, (2) the low shelf forebulge (approximately 200 m) as measured along a reference base Pliocene unconformity, and (3) observed gravity. An inelastically …


Regulation Of The Phonotactic Threshold Of The Female Cricket, Acheta Domesticus: Juvenile Hormone Iii, Allatectomy, L1 Auditory Neuron Thresholds And Environmental Factors, John Stout, Jing Hao, P. Kim, David Mbungu, M. Bronsert, S. Slikkers, J. Maier, D. Kim, K. Bacchus, Gordon Atkins May 1998

Regulation Of The Phonotactic Threshold Of The Female Cricket, Acheta Domesticus: Juvenile Hormone Iii, Allatectomy, L1 Auditory Neuron Thresholds And Environmental Factors, John Stout, Jing Hao, P. Kim, David Mbungu, M. Bronsert, S. Slikkers, J. Maier, D. Kim, K. Bacchus, Gordon Atkins

Faculty Publications

Juvenile hormone III (JHIII), when applied to the abdomen of 1-day-old female Acheta domesticus (in quantities that would create JHIII titers in the hemolymph that were within the range measured in females of this species) caused a significant decrease in phonotactic thresholds (Fig. 1). Removal of the corpora allata from 5-day-old females with low phonotactic thresholds caused significantly increased phonotactic thresholds 2-5 days later. After a temporary increase (24 h) of, on average, about 25 dB, the phonotactic thresholds drop to about 10 dB above preallatectomy levels (Fig. 2), but remain significantly higher than controls. Application of JHIII to allatectomized …


English Loanwords In Chicano Spanish: Characterization And Rationale, Robert N. Smead May 1998

English Loanwords In Chicano Spanish: Characterization And Rationale, Robert N. Smead

Faculty Publications

One highly visible, often stigmatized feature of Chicano Spanish is lexical innovation due to intimate contact with English and the mainstream culture. As noted in table 1, these Anglicisms are the result of varying degrees of host language adaptation and integration and include at least three distinct types of innovations: the lexical switch, the loanword, and the calque.


Discrete-To-Continuum Simulation Approach To Polymer Chain Systems: Subdiffusion, Segregation, And Chain Folding, Grace M. Foo, Ras B. Pandey May 1998

Discrete-To-Continuum Simulation Approach To Polymer Chain Systems: Subdiffusion, Segregation, And Chain Folding, Grace M. Foo, Ras B. Pandey

Faculty Publications

A discrete-to-continuum approach is introduced to study the static and dynamic properties of polymer chain systems with a bead-spring chain model in two dimensions. A finitely extensible nonlinear elastic potential is used for the bond between the consecutive beads with the Lennard-Jones (LJ) potential with smaller (Rc=21/6σ=0.95) and larger (Rc=2.5σ=2.1) values of the upper cutoff for the nonbonding interaction among the neighboring beads. We find that chains segregate at temperature T =1.0 with Rc=2.1 and remain desegregated with Rc=0.95. At low temperature (T=0.2), chains become folded, …


Annotated Bibliography Of Research In The Teaching Of English, Deborah Brown, Richard L. Larson, Melissa E. Whiting May 1998

Annotated Bibliography Of Research In The Teaching Of English, Deborah Brown, Richard L. Larson, Melissa E. Whiting

Faculty Publications

Twice a year, in the May and December issues, RTE publishes a selected bibliography of recent research in the teaching of English. Most of the studies listed appeared during the six-month period preceding the compilation of the bibliography (July through December, 1997, for the present bibliography), but some studies that appeared earlier are occasionally included. The listing is selective; it makes no attempt to include all research and research-related articles that appeared in the period tinder review. Comments on the bibliography and suggestions about items for inclusion may be directed to the bibliography editors. We encourage you to send your …


Resources For Undergraduate User Interface Implementation Courses, Charles J. Welty Ms Apr 1998

Resources For Undergraduate User Interface Implementation Courses, Charles J. Welty Ms

Faculty Publications

It has been estimated that 48% of the code and 50% of the implementation time required in new applications are directly related to the user interface (Myers and Rosson, 1992). Our research shows that most undergraduate courses that consider graphical user interfaces (GUIs) have no implementation component. Most undergraduate programs (85%) that include GUI implementation are offered at the Doctoral II Carnegie classification or above. Appropriate Web and print references and other materials given in this paper will help faculty at smaller institutions offer such courses.


A Spin Network Generalization Of The Jones Polynomial And Vassiliev Invariants, Rodolfo Gambini, Jorge Griego, Jorge Pullin Apr 1998

A Spin Network Generalization Of The Jones Polynomial And Vassiliev Invariants, Rodolfo Gambini, Jorge Griego, Jorge Pullin

Faculty Publications

We apply the ideas of Alvarez and Labastida to the invariant of spin networks defined by Witten and Martin based on Chern-Simons theory. We show that it is possible to define ambient invariants of spin networks that (for the case of SU(2)) can be considered as extensions to spin networks of the Jones polynomial. Expansions of the coefficients of the polynomial yield primitive Vassiliev invariants. The resulting invariants are candidates for solutions of the Wheeler-DeWitt equations in the spin network representation of quantum gravity.© 1998 Elsevier Science B.V. All rights reserved.


Mortality And Optimal Body Mass Index In A Sample Of The Us Population, Ramón A. Durazo-Arvizu, Daniel L. Mcgee, Richard S. Cooper, Youlian Liao, Amy Luke Apr 1998

Mortality And Optimal Body Mass Index In A Sample Of The Us Population, Ramón A. Durazo-Arvizu, Daniel L. Mcgee, Richard S. Cooper, Youlian Liao, Amy Luke

Faculty Publications

In this paper, the authors model the nonmonotonic relation between body mass index (BMI) (weight (kg)/height2 (m2)) and mortality in 13,242 black and white participants in the NHANES I Epidemiologic Follow-up Study in order to estimate the BMI at which minimum mortality occurs. The BMI of minimum mortality was 27.1 for black men (95% confidence interval (CI) 24.8-29.4), 26.8 for black women (95% CI 24.7-28.9) 24.8 for white men (95% CI 23.8- 25.9), and 24.3 for white women (95% CI 23.3-25.4). Each confidence interval included the group average. Analyses conducted by smoking status and after exclusion of persons with baseline …


Mapping Monthly Precipitation, Temperature, And Solar Radiation For Ireland With Polynomial Regression And A Digital Elevation Model, Christine L. Goodale, John D. Aber, Scott V. Ollinger Apr 1998

Mapping Monthly Precipitation, Temperature, And Solar Radiation For Ireland With Polynomial Regression And A Digital Elevation Model, Christine L. Goodale, John D. Aber, Scott V. Ollinger

Faculty Publications

A 1 km2 resolution digital elevation model (DEM) of Ireland was constructed and used as the basis for generating digital maps of the climate parameters required to run a model of ecosystem carbon and water cycling. The DEM had mean absolute errors of 30 m or less for most of Ireland. The ecosystem model requires inputs of monthly precipitation, monthly averaged maximum and minimum daily temperature, and monthly averaged daily solar radiation. Long-term (1951 to 1980) averaged monthly data were obtained from sites measuring precipitation (618 sites), temperature (62 sites), and the number of hours of bright sunshine per day …


Writing In The Legal Academy: A Dangerous Supplement, Lisa A. Eichhorn Apr 1998

Writing In The Legal Academy: A Dangerous Supplement, Lisa A. Eichhorn

Faculty Publications

This article explores the relationship of writing and speech in the legal academy through the lens of an ancient, embedded hierarchy that favors speech over writing. The article borrows the philosophical notion of the "dangerous supplement" to describe the role of writing in this hierarchy and argues that law schools have long seen only one aspect of this role, viewing writing as a "dangerous" curricular supplement, but failing to see why it is necessary to the existence of the remainder of the curriculum. This article examines the lurking distrust that surrounds writing in the legal academy. Part I of this …


Adoption Of Children In Missouri, Mary M. Beck Apr 1998

Adoption Of Children In Missouri, Mary M. Beck

Faculty Publications

The purpose of this Article is to investigate the effect of Missouri law on adoption and to determine whether its provisions adequately protect the parties to adoption and whether its degree of clarity properly forestalls litigation.


Coping With "Loss": A Re-Examination Of Sentencing Federal Economic Crimes Under The Guidelines, Frank O. Bowman Iii Apr 1998

Coping With "Loss": A Re-Examination Of Sentencing Federal Economic Crimes Under The Guidelines, Frank O. Bowman Iii

Faculty Publications

This Article has three objectives. First, it attempts to rethink the sentencing of federal economic criminals in light of the basic purposes of sentencing and of the Guidelines' particular structure and objectives. Second, it examines the deficiencies in the current sentencing guidelines regarding theft, fraud, and other economic crimes, and the problem areas in the case law construing those guidelines. Third, it proposes and analyzes a consolidated guideline, together with accompanying application notes, for sentencing virtually all theft and fraud cases (a draft of which follows the text of this Article as Appendix A).


Failing Faith In Litigation? A Survey Of Business Lawyers' And Executives' Opinions, John M. Lande Apr 1998

Failing Faith In Litigation? A Survey Of Business Lawyers' And Executives' Opinions, John M. Lande

Faculty Publications

To provide a more systematic assessment of contemporary faith in litigation, this article looks at a particular context-- business litigation--and analyzes the opinions of three groups of respondents: lawyers in private law firms who do commercial litigation (“outside counsel”), lawyers employed in business firms who do some litigation (“inside counsel”), and nonlawyer executives in business firms (“executives”). These groups have the greatest exposure to litigation in the corporate setting; furthermore, because they play powerful roles in our political, economic, and social life as well as the legal system, their opinions influence public opinion more generally.


The Impact Of Obesity And Body Fat Distribution On Ambulatory Blood Pressure In Children And Adolescents, Empar Lurbe, Vicente Alvarez, Youlian Liao, Jose Tacons, Richard Cooper, Beatriz Cremades, Isabel Torro, Josep Redón Apr 1998

The Impact Of Obesity And Body Fat Distribution On Ambulatory Blood Pressure In Children And Adolescents, Empar Lurbe, Vicente Alvarez, Youlian Liao, Jose Tacons, Richard Cooper, Beatriz Cremades, Isabel Torro, Josep Redón

Faculty Publications

To assess the relationship between obesity, body fat distribution, and blood pressure in children and adolescents, various measures of obesity and the waist-to-hip circumference ratio were related to casual and ambulatory blood pressure as measured using a SpaceLabs 90207 monitor during a regular school day. Seventy obese and 70 nonobese children aged 6 to 16 years were included in the study. Regardless of the time period analyzed (24 h, daytime, or nighttime), ambulatory blood pressure and casual blood pressure were significantly higher among the obese children. The differences in systolic blood pressure observed between the groups were attributable to the …


Political Culture In The Nineteenth Century South: Mississippi, 1830-1900, By Bradley G. Bond, Lacy K. Ford, Jr. Apr 1998

Political Culture In The Nineteenth Century South: Mississippi, 1830-1900, By Bradley G. Bond, Lacy K. Ford, Jr.

Faculty Publications

A review of Political Culture in the Nineteenth Century South: Mississippi, 1830-1900, by Bradley G. Bond


Authority And Sexuality In Early Modern Burgundy (1550-1730), Kathryn A. Edwards Apr 1998

Authority And Sexuality In Early Modern Burgundy (1550-1730), Kathryn A. Edwards

Faculty Publications

No abstract provided.