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

Digital Commons Network™

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

2012

Discipline
Institution
Keyword
Publication
Publication Type
File Type

Articles 1951 - 1980 of 19388

Full-Text Articles in Entire DC Network

Spite Versus Cheats: Competition Among Social Strategies Shapes Virulence In Pseudomonas Aeruginosa, R. Inglis, Sam Brown, Sam Brown, Angus Buckling Nov 2012

Spite Versus Cheats: Competition Among Social Strategies Shapes Virulence In Pseudomonas Aeruginosa, R. Inglis, Sam Brown, Sam Brown, Angus Buckling

Biology Department Faculty Works

Social interactions have been shown to play an important role in bacterial evolution and virulence. The majority of empirical studies conducted have only considered social traits in isolation, yet numerous social traits, such as the production of spiteful bacteriocins (anticompetitor toxins) and iron-scavenging siderophores (a public good) by the opportunistic pathogen Pseudomonas aeruginosa, are frequently expressed simultaneously. Crucially, both bacteriocin production and siderophore cheating can be favored under the same competitive conditions, and we develop theory and carry out experiments to determine how the success of a bacteriocin-producing genotype is influenced by social cheating of susceptible competitors and the resultant …

Go to article

Characterization Of Dusts In The Food Seasonings Sector, Brigitte Roberge, Simon Aubin, Yves Cloutier Nov 2012

Characterization Of Dusts In The Food Seasonings Sector, Brigitte Roberge, Simon Aubin, Yves Cloutier

Rapports de recherche scientifique

Les épices et les herbes aromatiques contiennent des substances organiques - nommées également substances actives - pouvant causer des irritations ou ayant un potentiel allergène pour la peau et pour le système respiratoire. De 1995 à 2007, la CSST a indemnisé 9 cas d’asthme survenus dans le secteur des autres industries de produits alimentaires qui comprennent notamment la production d’assaisonnements. Les auteurs ont caractérisé les poussières dans l’air d’établissements de fabrication de mélanges d’assaisonnement à base d’épices et d’herbes aromatiques en termes de poussières totales, de fractions inhalable et respirable ainsi que la granulométrie des poussières générées lors de diverses …

Go to article

First-Order Design Of A Reflective Viewfinder For Adaptive Optics Ophthalmoscopy, Alfredo Dubra, Yusufu N. Sulai Nov 2012

First-Order Design Of A Reflective Viewfinder For Adaptive Optics Ophthalmoscopy, Alfredo Dubra, Yusufu N. Sulai

Biomedical Engineering Faculty Research and Publications

Adaptive optics (AO) ophthalmoscopes with small fields of view have limited clinical utility. We propose to address this problem in reflective instruments by incorporating a viewfinder pupil relay designed by considering pupil and image centering and conjugation. Diverting light from an existing pupil optical relay to the viewfinder relay allows switching field of view size. Design methods that meet all four centering and conjugation conditions using either a single concave mirror or with two concave mirrors forming an off-axis afocal telescope are presented. Two different methods for calculating the focal length and orientation of the concave mirrors in the afocal …

Go to article

A Value-Added Study Of A Federal Grant Program In Mathematics For Military Dependent Students, Jay C. Marquand Phd Nov 2012

A Value-Added Study Of A Federal Grant Program In Mathematics For Military Dependent Students, Jay C. Marquand Phd

Dissertations

Closing the achievement gap in public education means all students are expected to be learning at grade level. In response to federal mandates requiring schools to attain specific student achievement benchmarks, many schools are placing greater resources into support programs designed to increase student achievement. Military dependent students experience unique challenges including, ongoing parent absences, extended parental deployments, and frequent moving and relocation. In California Unified School District (CUSD) where 37% of the student population is military connected, these challenges can place military dependent students at risk of failing socially, emotionally and academically. As a result, CUSD implemented an individualized, …

Go to article

The Characterisation And Numerical Modelling Of Viscoelastic Polyurethane Foams For Use In Custom Wheelchair Seating., Conor Briody Nov 2012

The Characterisation And Numerical Modelling Of Viscoelastic Polyurethane Foams For Use In Custom Wheelchair Seating., Conor Briody

Doctoral

Viscoelastic polyurethane foam is widely used in wheelchair cushions as it offers good pressure relieving capabilities. However, the behaviour of this material is largely un-quantified, by comparison with conventional elastomeric materials. Consequently, in many cases, inadequate cushioning is provided to wheelchair users with complex seating requirements. This thesis characterises and numerically models viscoelastic polyurethane foam. Temperature-dependent static compression and simple shear test procedures are conducted on a range of viscoelastic polyurethane foams and selected results are utilised to identify Ogden Hyperfoam material model parameters. Time-dependent creep and stress relaxation test procedures are conducted and test results are used in conjunction …

Go to article

G-Strands, Darryl Holm, Rossen Ivanov, James Percival Nov 2012

G-Strands, Darryl Holm, Rossen Ivanov, James Percival

Articles

A G-strand is a map g(t,s): RxR --> G for a Lie group G that follows from Hamilton's principle for a certain class of G-invariant Lagrangians. The SO(3)-strand is the G-strand version of the rigid body equation and it may be regarded physically as a continuous spin chain. Here, SO(3)K-strand dynamics for ellipsoidal rotations is derived as an Euler-Poincar'e system for a certain class of variations and recast as a Lie-Poisson system for coadjoint flow with the same Hamiltonian structure as for a perfect complex fluid. For a special Hamiltonian, the SO(3) …

Go to article

Facial Feature Point Fitting With Combined Color And Depth Information For Interactive Displays, Colin Bellmore Nov 2012

Facial Feature Point Fitting With Combined Color And Depth Information For Interactive Displays, Colin Bellmore

Theses

Interactive displays are driven by natural interaction with the user, necessitating a computer system that recognizes body gestures and facial expressions. User inputs are not easily or reliably recognized for a satisfying user experience, as the complexities of human communication are difficult to interpret in real-time. Recognizing facial expressions in particular is a problem that requires high-accuracy and efficiency for stable interaction environments. The recent availability of the Kinect, a low cost, low resolution sensor that supplies simultaneous color and depth images, provides a breakthrough opportunity to enhance the interactive capabilities of displays and overall user experience. This new RGBD …

Go to article

Collecting To The Core — Psychology Handbooks, Donald J. Polzella, Anne Doherty Nov 2012

Collecting To The Core — Psychology Handbooks, Donald J. Polzella, Anne Doherty

Psychology Faculty Publications

The American Psychological Association (APA), which publishes several specialized handbooks, describes them as “one-stop shop[s] for both overviews and in-depth analyses of a variety of sub-fields within psychology.” In general, upper-level undergraduates, graduate students, and faculty scholars consult handbooks for different reasons. Upper-level undergraduate and graduate students sometimes read handbook chapters for a course or seminar. (In my experience, most lower-level undergraduates find the style and content of handbook chapters bewildering.) Undergraduate honors students and, especially, graduate students may consult handbook chapters when they begin to work on their theses or dissertations, because the chapters provide authoritative reviews of relevant …

Go to article

Gendered Socialization With An Embodied Agent: Creating A Social And Affable Mathematics Learning Environment For Middle-Grade Females, Yanghee Kim, Jae Hoon Lim Nov 2012

Gendered Socialization With An Embodied Agent: Creating A Social And Affable Mathematics Learning Environment For Middle-Grade Females, Yanghee Kim, Jae Hoon Lim

Instructional Technology and Learning Sciences Faculty Publications

This study examined whether or not embodied-agent-based learning would help middle-grade females have more positive mathematics learning experiences. The study used an explanatory mixed-methods research design. First, a classroom-based experiment was conducted with one hundred and twenty 9th-graders learning introductory algebra (53% male and 47% female; 51% Caucasian and 49% Latino). The results revealed that learner gender was a significant factor in the learners’ evaluations of their agent (η2 = .07), the learners’ task-specific attitudes (η2 = .05), and their task-specific self-efficacy (η2 = .06). In-depth interviews were then conducted with 22 students selected from the experiment participants. The interviews …

Go to article

Admission Criteria To Saudi Medical Schools. Which Is The Best Predictor For Successful Achievement?, Jamal A. Albishri, Syed M. Aly, Yasir Alnemary Nov 2012

Admission Criteria To Saudi Medical Schools. Which Is The Best Predictor For Successful Achievement?, Jamal A. Albishri, Syed M. Aly, Yasir Alnemary

Saudi Medical Journal

OBJECTIVE: To assess the relationship between current pre-admission criteria and medical student9s grade point average (GPA) at the end of year 6 in 3 medical schools in the Kingdom of Saudi Arabia. METHODS: We conducted this observational analytical study at 3 government medical schools in the Kingdom of Saudi Arabia between January 2011 and February 2012. High school grades, achievement test (Tahsili test) scores, aptitude test (Qudraat tests) scores, Mathematics, and English grades in the high school were used to predict medical student9s GPA at the end of year 6. The criterion variable was student9s cumulative GPA at the end …

Go to article

"Tuning Hole Mobility In Inp Nanowires", Mariama Rebello Sousa Dias, A. Picinin, V. Lopez-Richard, S. E. Ulloa, L. K. Castelano, J. P. Rino, G. E. Marques Nov 2012

"Tuning Hole Mobility In Inp Nanowires", Mariama Rebello Sousa Dias, A. Picinin, V. Lopez-Richard, S. E. Ulloa, L. K. Castelano, J. P. Rino, G. E. Marques

Physics Faculty Publications

Transport properties of holes in InP nanowires (NWs) were calculated considering electron-phonon interaction via deformation potentials, the effect of temperature, and strain fields. Using molecular dynamics, we simulate NW structures, the longitudinal optical phonon (LO-phonon) energy renormalization, and lifetime. The valence band ground state changes between light- and heavy-hole character, as the strain fields and the NW size vary. Drastic changes in the mobility arise with the onset of resonance between the LO-phonons and the separation between valence subbands.

Go to article

Search For Electroweak Production Of Charginos And Neutralinos Using Leptonic Final States In Pp Collisions At S√=7 Tev, The Cms Collaboration, S. Chatrchyan, V. Khachatryan, Marc M. Baarmand, B. Dorney, Marcus Hohlmann, Himali Kalakhety, Igor B. Vodopiyanov Nov 2012

Search For Electroweak Production Of Charginos And Neutralinos Using Leptonic Final States In Pp Collisions At S√=7 Tev, The Cms Collaboration, S. Chatrchyan, V. Khachatryan, Marc M. Baarmand, B. Dorney, Marcus Hohlmann, Himali Kalakhety, Igor B. Vodopiyanov

Aerospace, Physics, and Space Science Faculty Publications

The 2011 dataset of the CMS experiment, consisting of an integrated luminosity of 4.98 fb−1 of pp collisions at s=7" role="presentation" style="box-sizing: inherit; display: inline; line-height: normal; word-spacing: normal; overflow-wrap: normal; text-wrap: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; padding: 0px; margin: 0px; position: relative;">s√=7�=7 TeV, enables expanded searches for direct electroweak pair production of charginos and neutralinos in supersymmetric models as well as their analogs in other models of new physics. Searches sensitive to such processes, with decays to final states that contain two or more leptons, are presented. …

Go to article

Determination Of A Predictive Model For The Fundamentals Of Engineering Examination, Edward W. Wheeler Nov 2012

Determination Of A Predictive Model For The Fundamentals Of Engineering Examination, Edward W. Wheeler

Electronic Theses and Dissertations Archive

In early 1995, the University of Tennessee at Martin (UTM) sought permission to terminate three existing engineering technology degree programs and replace them with a single Bachelor of Science in Engineering (BSE) degree. As part of the requirements to proceed with the implementation of an engineering program, the University of Tennessee system mandated the program be unique and different from any other engineering program in the state. In compliance with these guidelines, the curriculum was built with no separable majors. In addition, passing the Engineer-in-Training (now the Fundamentals of Engineering (FE)) examination was incorporated as a degree requirement. This examination …

Go to article

Modeling And Simulation Of Pressure Waves Generated By Nano-Thermite Reactions, Karen S. Martirosyan, Maxim Zyskin, Charles M. Jenkins, Yasuyuki Horie Nov 2012

Modeling And Simulation Of Pressure Waves Generated By Nano-Thermite Reactions, Karen S. Martirosyan, Maxim Zyskin, Charles M. Jenkins, Yasuyuki Horie

Physics & Astronomy Faculty Publications

This paper reports the modeling of pressure waves from the explosive reaction of nano-thermites consisting of mixtures of nanosized aluminum and oxidizer granules. Such nanostructured thermites have higher energy density (up to 26 kJ/cm3) and can generate a transient pressure pulse four times larger than that from trinitrotoluene (TNT) based on volume equivalence. A plausible explanation for the high pressure generation is that the reaction times are much shorter than the time for a shock wave to propagate away from the reagents region so that all the reaction energy is dumped into the gaseous products almost instantaneously and thereby a …

Go to article

From Mekteb-I-Nuwwab To The Faculty Of Islamic Studies: A Short History Of Bosnia's Leading Islamic Educational Institution, Harun Karèiæ Nov 2012

From Mekteb-I-Nuwwab To The Faculty Of Islamic Studies: A Short History Of Bosnia's Leading Islamic Educational Institution, Harun Karèiæ

Occasional Papers on Religion in Eastern Europe

No abstract provided.

Go to article

From Reflecting To Making: Psychology In A World Of Change, Kenneth J. Gergen Nov 2012

From Reflecting To Making: Psychology In A World Of Change, Kenneth J. Gergen

Psychology Faculty Works

No abstract provided.

Go to article

Comparison Of College/Career Readiness Outcomes Between The Advancement Via Individual Determination (Avid) Program And The Traditional High School Academic Program, Sandra K. Day Nov 2012

Comparison Of College/Career Readiness Outcomes Between The Advancement Via Individual Determination (Avid) Program And The Traditional High School Academic Program, Sandra K. Day

Student Work

This study compared selected college/career readiness outcomes for students attending an urban high school who voluntarily participated in an academic support program, Advancement Via Individual Determination (AVID), to demographically similar/same school peers who completed the traditional academic program (TAP) of study. Grade point average, rigorous curriculum, and ACT scores are universally accepted predictors of college and career readiness and were the yardsticks used in this study.

Go to article

What Studios Do, Eliot Bates Nov 2012

What Studios Do, Eliot Bates

Publications and Research

This essay is focused around a seemingly simple question – what do recording studios do? First, a clarification. I am not primarily asking “what are studios” or “what do people do in studios,” two comparatively straightforward questions that are tangentially addressed in academic and trade writing. Rather, I wish to consider some of the ways in which the studio itself shapes the kinds of social and musical performances and interactions that transpire within. I contend that studios must be understood simultaneously as acoustic environments, as meeting places, as container technologies, as a system of constraints on vision, sound and mobility, …

Go to article

Operator Monotone Functions And Löwner Functions Of Several Variables, Jim Agler, John E. Mccarthy, N J. Young Nov 2012

Operator Monotone Functions And Löwner Functions Of Several Variables, Jim Agler, John E. Mccarthy, N J. Young

Mathematics Faculty Research

We prove generalizations of Loewner's results on matrix monotone functions to several variables. We give a characterization of when a function of d variables is locally monotone on d-tuples of commuting self-adjoint n-by-n matrices. We prove a generalization to several variables of Nevanlinna's theorem describing analytic functions that map the upper half-plane to itself and satisfy a growth condition. We use this to characterize all rational functions of two variables that are operator monotone.

Go to article

Markets As A Moral Foundation For Contract Law, Nathan B. Oman Nov 2012

Markets As A Moral Foundation For Contract Law, Nathan B. Oman

Faculty Publications

No abstract provided.

Go to article

What Is The Pcor Partnership?, University Of North Dakota. Energy And Environmental Research Center Nov 2012

What Is The Pcor Partnership?, University Of North Dakota. Energy And Environmental Research Center

EERC Brochures and Fact Sheets

Fact sheet describing the Plains CO2 Reduction (PCOR) Partnership. Outlines the phases of U.S. Department of Energy National Energy Technology Laboratory’s Regional Carbon Sequestration Partnership program. [This item is an outdated or superseded version and retained for historical purposes only. It may no longer reflect current information, policies, or practices.]

Go to article

Toward A Theory Of Extended Contact: The Incentives And Opportunities For Bridging Across Network Communities, Maxim Sytch, Adam Tatarynowicz, Ranjay Gulati Nov 2012

Toward A Theory Of Extended Contact: The Incentives And Opportunities For Bridging Across Network Communities, Maxim Sytch, Adam Tatarynowicz, Ranjay Gulati

Research Collection Lee Kong Chian School Of Business

This study investigates the determinants of bridging ties within networks of interconnected firms. Bridging ties are defined as nonredundant connections between firms located in different network communities. We highlight how firms can enter into these relationships because of the incentives and opportunities for action that are embedded in the existing network structure. Specifically, we propose that the dynamics of proximate network structures, which reflect firms' and their partners' direct connections, affect the formation of bridging ties by shaping the value-creation and value-distribution incentives for bridging. We also argue that the evolving global network structure affects firms' propensity to form bridging …

Go to article

Key Mechanics Of The U.S. Tri-Party Repo Market, Adam Copeland, Darrell Duffie, Antoine Martin, Susan Mclaughlin Nov 2012

Key Mechanics Of The U.S. Tri-Party Repo Market, Adam Copeland, Darrell Duffie, Antoine Martin, Susan Mclaughlin

Documents

No abstract provided.

Go to article

P3ht:Pcpdtbt:Pcbm Multi- Polymer Single Layer Solar Cells, Ted Andreas Nov 2012

P3ht:Pcpdtbt:Pcbm Multi- Polymer Single Layer Solar Cells, Ted Andreas

Physics

OPV efficiencies are limited by their narrow absorption; rather than using tandem architecture to overcome this obstacle, our group combined P3HT and PCPDTBT into a single layer BHJ solar cell that achieved 2.0% PCE. This is 33% higher than the pure P3HT control from this group, proving that multi-polymer solar cells have the potential to outperform their single-polymer components.

Go to article

Using Governmental Incentives To Finance Solar Renewable Energy Projects: Alternative Investments For High-Net-Worth Individuals, Michael Cole Nov 2012

Using Governmental Incentives To Finance Solar Renewable Energy Projects: Alternative Investments For High-Net-Worth Individuals, Michael Cole

LSU Journal of Energy Law and Resources

No abstract provided.

Go to article

Truths We Must Tell Ourselves To Manage Climate Change, Robert H. Socolow Nov 2012

Truths We Must Tell Ourselves To Manage Climate Change, Robert H. Socolow

Vanderbilt Law Review

In 1958, Charles David Keeling began measuring the concentration of carbon dioxide (C02) in the atmosphere, at a site 11,000 feet above sea level near the top of Mauna Loa on the "big island" of Hawaii. The time series of monthly averages, the "Keeling Curve," is the iconic figure of climate change (see Figure 1). The curve oscillates and rises. The annual oscillations (whose details are seen in the Figure's inset) are the consequences of the seasonal breathing of the northern-hemisphere forests, which remove C02 from the atmosphere during their growing season and return C02 to the atmosphere as their …

Go to article

The Soulless Machine, Nathan Lomas Nov 2012

The Soulless Machine, Nathan Lomas

Theses

Since their creation, we have grown increasingly reliant on machines to aid us in our understanding and perceptions of the world - the camera is no exception. As an extension of the human eye, it allows us the opportunity to examine our environments from new perspectives, offering up views that we may not be able to witness on our own. Though in truth, the structure of the machine is ingrained in everything we know: from the natural world to our social patterns, actions are prescribed, parts move with united purpose, yet there is a certain comfort in the surrender of …

Go to article

Beyond Adaptive Capacity Checklists: Examining The Construction Of Capacity In Mexico City And Santiago, Patricia Romero-Lankao, Sara Hughes, Angélica Rosas-Huerta, Roxana Borquéz, Melissa Haeffner Nov 2012

Beyond Adaptive Capacity Checklists: Examining The Construction Of Capacity In Mexico City And Santiago, Patricia Romero-Lankao, Sara Hughes, Angélica Rosas-Huerta, Roxana Borquéz, Melissa Haeffner

Environmental Science and Management Faculty Publications and Presentations

Cities are vulnerable to a range of environmental hazards that are likely to be exacerbated by climate change: floods, droughts, poor air quality, and heat islands are a few examples. Assessments of this vulnerability often include an evaluation of a city’s adaptive capacity, or its potential to respond to changes in the frequency or severity of environmental hazards as well as its ability to take advantage of or mitigate these changes. For example, at the city (e.g., institutional) level, a common metric of adaptive capacity is the availability and effective use of information. In many cases, a city would receive …

Go to article

Trajectories And Distribution Of Interstellar Dust Grains In The Heliosphere, Jonathan D. Slavin, Priscilla C. Frisch, Hans-Reinhard Müller, Jacob Heerikhuisen Nov 2012

Trajectories And Distribution Of Interstellar Dust Grains In The Heliosphere, Jonathan D. Slavin, Priscilla C. Frisch, Hans-Reinhard Müller, Jacob Heerikhuisen

Dartmouth Scholarship

The solar wind carves a bubble in the surrounding interstellar medium (ISM) known as the heliosphere. Charged interstellar dust grains (ISDG) encountering the heliosphere may be diverted around the heliopause or penetrate it depending on their charge-to-mass ratio. We present new calculations of trajectories of ISDG in the heliosphere, and the dust density distributions that result. We include up-to-date grain charging calculations using a realistic UV radiation field and full three-dimensional magnetohydrodynamic fluid + kinetic models for the heliosphere. Models with two different (constant) polarities for the solar wind magnetic field (SWMF) are used, with the grain trajectory calculations done …

Go to article

Problematique, David A. Westbrook Nov 2012

Problematique, David A. Westbrook

Other Scholarship

No abstract provided.

Go to article

First Prev Next Last