Digital Commons Network^™

Epistemological Pluralism: Reorganizing Interdisciplinary Research, Thaddeus R. Miller, Timothy D. Baird, Caitlin M. Littlefield, Gary Kofinas, F. Stuart Chapin Iii, Charles L. Redman

Urban Studies and Planning Faculty Publications and Presentations

Despite progress in interdisciplinary research, difficulties remain. In this paper, we argue that scholars, educators, and practitioners need to critically rethink the ways in which interdisciplinary research and training are conducted. We present epistemological pluralism as an approach for conducting innovative, collaborative research and study. Epistemological pluralism recognizes that, in any given research context, there may be several valuable ways of knowing, and that accommodating this plurality can lead to more successful integrated study. This approach is particularly useful in the study and management of social–ecological systems. Through resilience theory's adaptive cycle, we demonstrate how a focus on epistemological pluralism …

First Results From Ideal 2-D Mhd Reconstruction: Magnetopause Reconnection Event Seen By Cluster, W. L. Teh, B. U. O. Sonnerup

Dartmouth Scholarship

We have applied a new reconstruction method (Sonnerup and Teh, 2008), based on the ideal single-fluid MHD equations in a steady-state, two-dimensional geometry, to a reconnection event observed by the Cluster-3 (C3) space- craft on 5 July 2001, 06:23 UT, at the dawn-side Northern- Hemisphere magnetopause. The event has been previously studied by use of Grad-Shafranov (GS) reconstruction, per- formed in the deHoffmann-Teller frame, and using the as- sumption that the flow effects were either negligible or the flow was aligned with the magnetic field. Our new method allows the reconstruction to be performed in the frame of reference moving …

Utilization Of Revoicing Based On Learners‘ Thinking In An Inquiry-Oriented Differential Equations Class, Oh Kwon Nam, Mi Kyung Ju, Chris Rasmussen, Karen A. Marrongelle, Jae Hee Park, Kyoung Hee Cho, Jung Sook Park, Jee Hyun Park

Mathematics and Statistics Faculty Publications and Presentations

Researchers of mathematics education are increasingly interested in a teacher's discursive moves, which refer to deliberate actions taken by a teacher to participate in or influence debate and discussion in the mathematics classroom. This study explored one teacher's discursive moves in an undergraduate inquiry-oriented mathematics class. The data for this study come from four class sessions in which students investigated initial value problems as represented by the phase portrait of a system of differential equations. Through the analysis and a review of the literature, we identified four categories of a teacher's discursive moves: revoicing, questioning/requesting, telling, and managing. This report …

The Effect Of Particles On Creep Rate And Microstructures Of Granular Ice, Min Song, Ian Baker, David M. Cole

Dartmouth Scholarship

The microstructures of particle-free granular freshwater ice and ice containing 1 wt.% of 50 ± 10 mm uniformly distributed particles were investigated before and after compressive creep to ∼10% strain with stresses of 1.45 MPa at −10°C and 0.4 MPa at −5°C. Creep rates of particle-containing ice were always higher than those of particle-free ice. For an initial stress of 1.45 MPa at −10°C, dynamic recrystallization occurred with new grains nucleating and growing along grain boundaries for both sets of specimens, and the ice with particles showed a higher nucleation rate. Under creep with an initial stress of 0.4 MPa …

The Science Of Persuasion In Recent Discourse On T.R. Malthus: An Exercise In The Analysis Of Rhetoric In Economics, Laila Winner

Economics Undergraduate Honors Theses

Of all the dour portraits lining the august halls of Economics, it is that of Thomas Robert Malthus which seems perhaps to scowl the most grimly. Describing an approach or policy as Malthusian in everyday conversation conjures a host of disturbing images, bare fields and squalling babies chief among them. Such allusions provoke even stronger reactions within the discipline Malthus helped to found, ranging from Keynes's fervent championship to the sneering dismissal of Samuelson. Neither the more famous Smith nor Ricardo nor even Marx can claim to have gained in their lives what the comparatively less prolific Reverend did with …

Crossing Borders, Building Bridges, Gayle Y. Thieman

Education Faculty Publications and Presentations

This article is derived from the presidential address delivered at the NCSS Annual Meeting in San Diego on November 30, 2007.

Through collaboration and involvement, we can meet the five critical challenges facing social studies educators today.

Invasive Predator, Bythotrephes, Has Varied Effects On Ecosystem Function In Freshwater Lakes, Angela L. Strecker, Shelley E. Arnott

Environmental Science and Management Faculty Publications and Presentations

Bythotrephes longimanus is an invertebrate predator that has invaded the North American Great Lakes and a number of inland lakes, where it preys on crustacean zooplankton. We examined the effect of Bythotrephes on two measures of ecosystem function during a four month observational study of freshwater lakes on the boreal shield. Bythotrephes-invaded lakes had significantly lower epilimnetic zooplankton abundance and production compared to reference lakes. On average, Bythotrephes consumed 34% ofzooplankton production when it was present in lakes. There was some evidence of changes in the timing of zooplankton production, as well as shifts to cooler, less productive habitats, which …

Superior Adaptation To Drought In Rubus Armeniacus (Himalayan Blackberry) In Northwest Oregon, J. Alan Yeakley, Joshua S. Caplan

Environmental Science and Management Faculty Publications and Presentations

Despite the status Rubus armeniacus (Himalayan blackberry) has as one of the most prolific and damaging plant invaders in the Pacific Northwest, we know little about the role of water relations in its success. The information available on invasive blackberry water relations (Fotelli et al. 2001; McDowell and Turner 2002) suggests that an ability to avoid water stress has been critically important to their proliferation in regions with Mediterranean climates (Amor et al. 1998). We had two objectives regarding the role of water relations in the invasive success of R. armeniacus:

Objective 1. Determine if R. armeniacus is better adapted …

Differential Effects Of Understory And Overstory Gaps On Tree Regeneration, Brian Beckage, Brian D. Kloeppel, J. Alan Yeakley, Sharon F. Taylor, David C. Coleman

Environmental Science and Management Faculty Publications and Presentations

Gaps in the forest canopy can increase the diversity of tree regeneration. Understory shrubs also compete with tree seedlings for limited resources and may depress tree recruitment. We compared effects of shrub removal and canopy windthrow gaps on seedling recruitment and understory resource levels. Shrub removal, with the canopy left intact, was associated with increased levels of understory light and soil moisture and coincided with increased species richness and diversity of tree regeneration compared to both control plots and canopy gaps. Canopy windthrow gaps, however, resulted in a more than 500 fold increase in soil nitrate concentrations, and seedling growth …

Engaging Recreational Fishers In Management And Conservation: Global Case Studies, Elise F. Granek, Elizabeth M.P. Madin, M. A. Brown, Will F. Figueira, Darren S. Cameron, Zeb Hogan, Gerry Kristianson, Pierre De Villiers, Jack E. Williams, John R. Post, S. Zahn, R. Arlinghaus

Environmental Science and Management Faculty Publications and Presentations

Globally, the number of recreational fishers is sizeable and increasing in many countries. Associated with this trend is the potential for negative impacts on fish stocks through exploitation or management measures such as stocking and introduction of non-native fishes. Nevertheless, recreational fishers can be instrumental in successful fisheries conservation through active involvement in, or initiation of, conservation projects to reduce both direct and external stressors contributing to fishery declines. Understanding fishers’ concerns for sustained access to the resource and developing methods for their meaningful participation can have positive impacts on conservation efforts. We examined a suite of case studies that …

Rapid Assessment Of 2008-2012 Highway Development Projects In Region 6: Threats And Opportunities To Terrestrial Wildlife Resources, Sandra L. Jacobson, Catherine E. De Rivera, Kathleen Armstrong, Rebecca Aaby, Nadia Jones

Environmental Science and Management Faculty Publications and Presentations

Summaries of Highway Development Projects in Region 6 National Forests.

This document contains a summary of higher complexity projects selected for their interest to line officers and resource managers. These projects represent not only the current Statewide Transportation Improvement Plan (STIP) projects but also a sample of the types of projects that will be on future STIPs. Thus, readers are urged to glance at the tracking tools and narratives for all forests to gain a quick glimpse of the types of projects potentially facing each forest. The summary has extracted brief information on project locations and types, the program year …

Nutrient Uptake By Intact And Disturbed Roots Of Loblolly Pine Seedlings, Melissa S. Lucash, Ruth D. Yanai, J. Devereux Joslin

Environmental Science and Management Faculty Publications and Presentations

Most measurements of nutrient uptake use either hydroponic systems or soil-grown roots that have been disturbed by excavation. The first objective of this study was to test how root excavation affects nitrate uptake. Rates of NO3− uptake by mycorrhizal loblolly pine (Pinus taeda L.) seedlings were measured in intact sand-filled columns, hydroponics, and disturbed sand-filled columns. Total nitrate uptake in intact sand-filled columns was higher than in disturbed columns, indicating that disturbance lowers uptake. Transferring plants from the sand-filled columns to hydroponics had little effect on NO3− uptake beyond delaying uptake for an hour. The second objective of this study …

Refactoring Tools: Fitness For Purpose, Emerson Murphy-Hill, Andrew P. Black

Computer Science Faculty Publications and Presentations

Refactoring tools can improve the speed and accuracy with which we create and maintain software -- but only if they are used. In practice, tools are not used as much as they could be: this seems to be because sometimes they do not align with the refactoring tactic preferred by the majority of programmers, a tactic we call floss refactoring. We propose five principles that characterize successful floss refactoring tools -- principles that can help programmers to choose the most appropriate refactoring tools and also help toolsmiths to design tools that fit the programmer's purpose.

The Impact Of The Caernarvon Diversion On Above- And Belowground Marsh Biomass In The Breton Sound Estuary After Hurricane Katrina, Matthew Korbel Moerschbaecher

LSU Master's Theses

The purpose of this project was to monitor the recovery of marsh vegetation following Hurricane Katrina in the Breton Sound estuary, which is directly influenced by the Caernarvon freshwater diversion. From March 2006 until October 2007, we measured above- and belowground biomass, soil porewater nutrients (NOx, NH4, and PO4), porewater salinity, porewater sulfide concentrations, and soil redox potential bimonthly at duplicate Near (N), Intermediate (M), and Far (F) sites (with respect to the diversion), as well as at a Reference (C) site. End of season live (EOSL) below and above ground biomass was measured at 26 separate stations where vegetation …

Monte Carlo Modeling Of Spatial Coherence: Free-Space Diffraction, Donald D. Duncan, David G. Fischer, Scott A. Prahl

Electrical and Computer Engineering Faculty Publications and Presentations

We present a Monte Carlo method for propagating partially coherent fields through complex deterministic optical systems. A Gaussian copula is used to synthesize a random source with an arbitrary spatial coherence function. Physical optics and Monte Carlo predictions of the first- and second-order statistics of the field are shown for coherent and partially coherent sources for free-space propagation, imaging using a binary Fresnel zone plate, and propagation through a limiting aperture. Excellent agreement between the physical optics and Monte Carlo predictions is demonstrated in all cases. Convergence criteria are presented for judging the quality of the Monte Carlo predictions.

The Viability Of A Thermoelectric Fuel Conditioning System For A Diesel Engine Utilizing Biodiesel, Timothy Schriefer

Theses

Certain internal combustion engines, which run on hydrocarbon fuels, experience difficulty upon engine start-up in extreme cold weather. As ambient temperature decreases below the fuel cloud point and beyond, paraffin form in the fuel and eventually clog the fuel filter causing the engine to fail to start. This problem becomes more pronounced when the engine in question is a Diesel and the fuel utilized is biodiesel. As an alternative fuel source, biodiesel has many advantages; however, its cold weather performance is worse than even conventional diesel fuel. As biodiesel becomes more integrated into the world’s energy usage scenario, one of …

The Transcendental Dimension Of Phenomenology, Sebastian Luft

Philosophy Faculty Research and Publications

This short text to follow is an attempt at philosophizing "free-style"; an attempt, that is, which does not concern itself with much recourse to primary or secondary literature. Hence, references to texts by the philosophers mentioned here are kept to a minimum. The purpose of this text, instead, is to initiate a "fundamental reflection", as one could call it, on the nature of phenomenology. May the reader indulge me in this free-styling activity, and I would welcome equally unburdened responses.

Curriculum And Standards : Theatre Education In California Public High Schools, Shauna Honey Yelnick

Master's Theses

No abstract provided.

Evolutionary History And Hybridization In Passerina Buntings, Matthew D. Carling

LSU Doctoral Dissertations

Understanding the genetic basis of speciation is of fundamental importance to evolutionary biology and hybrid zones offer unique natural laboratories in which to investigate the ecological and evolutionary processes important in creating and maintaining biological diversity. By comparing introgression patterns of different loci, researchers can begin to identify genetic regions that contribute to reproductive isolation between hybridizing taxa. In taxa, like birds, with heterogametic females, Haldane’s rule predicts that mtDNA and z-linked loci will introgress less than autosomal loci. I tested this prediction using the hybrid zone between Passerina cyanea (Indigo Bunting) and Passerina amoena (Lazuli Bunting), two species that …

Land Alive!, Or Metamorphosis In The Sportsman's Paradise, Adam Tourek

LSU Master's Theses

"Land Alive!" is best described a multimedia work. The produce of travels to the area of the Mississippi River delta, along with text-based research, formed the materials from which two evenings of participative performance were crafted. Personal narratives were used alongside evaluations of administrative programs, and the space in the Backyard Gallery was transformed using shovels, buckets, and teamwork. Found chairs, rope, and other objects, through ritualized interaction, became an aesthetic formation; everyone present worked together in the assembly of a boat, which contained the results of these interactions between myself, six volunteers, and an audience turned participants. The evenings …

Magnetic Field Effects On Diffusion Flames, Diego F. Gonzalez

LSU Master's Theses

Magnetic field effects in combustion is an area of study that has previously been overlooked. The influence of magnetic fields on flames has only recently been explored and is of interest both from a scientific and a practical standpoint. This study provides theoretical, numerical and experimental evidence that combustion can be affected with the use of suitable magnetic fields. This thesis focuses on four different types of magnetic field: homogeneous, gradient, oscillating and pre-combustion. For the homogeneous field case, the Gibbs Free Energy method was used to determine the mole fraction of product species. It was found that homogeneous fields …

Evaluating Ecological Equivalence In Created Marshes, Christopher Bromley Llewellyn

LSU Master's Theses

The overall goal of coastal wetland restoration is to achieve ecological equivalence through the reproduction of structural and functional characteristics. This study sought to examine ecological equivalence using a chronosequence of temporal replicates of created marshes using traditional structural measures of equivalence and tested the use of stable isotopes as a measure of functional equivalence. The objectives of this study were to: (1) compare measures of structural equivalence at created and reference marshes; (2) use stable isotope analysis of blue crab muscle and hepatopancreas tissues to compare functional equivalence at created and reference marshes; and (3) determine if there is …

Designing Surface Chemistries For In Situ Afm Investigations Of Biomolecular Reactions With Proteins At The Nanoscale, Johnpeter Ndiangui Ngunjiri

LSU Doctoral Dissertations

In situ atomic force microscopy (AFM) characterizations and lithography can be applied to investigate the orientation, reactivity and stability of protein molecules adsorbed on nanostructures of self-assembled monolayers at near-physiological conditions. Automated nanografting was used to fabricate regular arrays of nanopatterns of ù-functionalized n-alkanethiols with designated terminal chemistries. After writing nanopatterns, protein binding occurs selectively on carboxylate-terminated nanopatterns via covalent bonds that are formed using N-ethyl-N'(dimethylaminoporpyl)-carbodiimide and N-hydroxysuccinimide activation. The amine groups of lysine residues of proteins bond covalently to nanopatterns of carboxylate-terminated alkanethiol self-assembled monolayers, to form a robust surface attachment for sustained contact-mode AFM imaging during biochemical reactions. …

Inventory And Mapping Of Aquatic Plants At Lake Roosevelt National Recreation Area, Mark D. Sytsma, Rich Miller

Center for Lakes and Reservoirs Publications and Presentations

Lake Roosevelt is a large reservoir in northeast Washington State formed by the Grand Coulee Dam. The reservoir, which inundates portions of the Columbia River, the Spokane River, and other rivers and streams, is the focus of the Lake Roosevelt National Recreation Area (LARO) that is managed by the National Park Service. LARO encompasses 100,390 acres (40,625 ha) and includes significant cultural and recreational resources. The surface area, volume, and shoreline length of Lake Roosevelt at full pool is 82,691 acres (33,490 ha), 9.41 × 10¹⁰ acre-ft (1.16 × 10¹⁰ m³) (Nigro et. al. 1981), and …

Mathematical Skill Acquisition: Transfer Effects Of A Computer Game Based On The Components Theory Of Skill Acquisition, Jenny Kessell

Theses : Honours

Research within the field of mathematical learning has often focused on the extent to which knowledge of particular mathematical skills can facilitate the learning of new and unpracticed mathematical skills. Additionally, it has examined the influence of context on learning and the amount of practice necessary for complex skill acquisition to result. This paper provides a review of the research examining mathematical learning, skill acquisition and transfer of skills in a mathematical context. Pertinent theories in the field of cognitive skill acquisition are examined for their ability to explain transfer of skill. The review focuses on factors that influence the …

Enabling Wind Turbine Generators To Participate In Power Grid Frequency Regulation For Enhanced Stability, Hongtao Ma

Doctoral Dissertations

"This dissertation focuses on wind farm frequency regulation capability to maintain the grid frequency stability. Wind plant power controllers are designed and tested for participation in grid frequency restoration. The small signal stability on sub-optimal operating points is analyzed and a de-loaded operating point is proposed.

In the first paper, a new frequency regulation scheme is developed for the wind turbine/generator/converter trio that will provide the capability to participate in restoring frequency in a way similar to the droop response of conventional generators. Output active power adjustment can be realized by both converter and pitch angle control in addition to …

Development And Evaluation Of Passive Sampling And Lc-Ms Based Techniques For The Detection And Monitoring Of Lipophilic Marine Toxins In Mesocosm And Field Studies, Elie Fux

Doctoral

The consumption of shellfish that accumulate marine biotoxins produced by harmful Algae can result in severe gastrointestinal or neurotoxic illnesses depending on the nature of the toxin. Therefore, it is essential that suitable monitoring programs are implemented in order to protect public health. This PhD study focused on aspects of the characteristics and monitoring of azaspiracids and toxins from Dinophysis spp. Passive samplers were used in this study in parallel with both indigenous and transplanted mussels that did not contain toxins to investigate the accumulation of toxins on the West coast of Ireland during 2005. This approach allowed for a …

Novel Photoelectrochemical Cell For The Remediation Of Organic Compounds In Water, Patrick Enright

Doctoral

Titanium dioxide (TiO2) suspensions have widely been used as photocatalysts, either alone or in a doped form to degrade organic compounds and kill bacteria. Because of its relatively large band gap, UV light has been the most efficient radiation used to allow this catalysis to occur. TiO2 has also been immobilised on electrodes in order to separate the ‘reduction’ and ‘oxidation’ reactions. Typical systems involve the oxidation of a ‘fuel’ at a TiO2 coated anode and the reduction of oxygen at a separate cathode, where the passage of current can be monitored, and this work utilises such a system. In …

Digital Close Range Photogrammetry In Motor Vehicle Accident Reconstruction, Fiona Coyle

Doctoral

Road traffic accidents are consistently in the top ten causes of death world-wide. In order to reduce the number of fatalities caused by traffic collision, better knowledge and understanding of the sequence of events prior to and during a traffic accident, i.e. Accident Reconstruction, is required, so it is important to obtain detailed quantitative information about the damage sustained by the crashed vehicle(s). The research reported here was aimed at developing a fast and accurate method of measuring the damage. Digital Close Range Photogrammetry is the technique chosen for obtaining vehicle profiles from which accurate measurements of crust damage could …

Staying Within The Margins: The Educational Stories Of First-Generation, Low-Income College Students, Diane Lyn Cole

Dissertations and Theses

his research addressed educational persistence among first-generation, low-income college students. The educational paths of 22 first-generation, low-income undergraduate students attending a large, urban university in the Northwest region of the United States were examined through a narrative framework. Half of the participants had persisted from year one to year two, and the other half left the university after their first year. Analytic procedures consisted of thematic qualitative coding, an analysis of student trajectories over educational histories, and the reconstruction of narrative stories. Data were used to examine: (1) How first-generation, low-income students understood and described their journey through their first …