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2012

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Articles 11341 - 11370 of 12196

Full-Text Articles in Physical Sciences and Mathematics

Investigations Into The Role Of Natural Organic Matter As An Interface Between Aquatic Organisms And Environmental Pollutants, Caroline Lillian Schneider Jan 2012

Investigations Into The Role Of Natural Organic Matter As An Interface Between Aquatic Organisms And Environmental Pollutants, Caroline Lillian Schneider

LSU Doctoral Dissertations

The impact of the continuous pollution of freshwater environments by multiple pollutants has not been well-studied. The goal of this research was to evaluate the toxicity of several modern pollutants in a model environment. The prokaryotic, unicellular blue-green algae Synechocystis WT6803 and the eukaryotic, multicellular Utterbackia imbecillis mussel larvae were studied along with Suwannee River natural organic matter (NOM). The toxicity response of the blue-green algae Synechocystis sp. was measured through changes in growth rates. The inorganic pollutant silver nanoparticles (0.044 μM) were toxic. Gold nanoparticles did not affect the growth rate. The addition of 15 mg/L NOM partially inhibited …

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Life History And Ecology Of The Freshwater Amphipods Gammarus Pseudolimnaeus And Gammarus Fasciatus In Southeastern Virginia, Lindsey L. Postaski Jan 2012

Life History And Ecology Of The Freshwater Amphipods Gammarus Pseudolimnaeus And Gammarus Fasciatus In Southeastern Virginia, Lindsey L. Postaski

Dissertations, Theses, and Masters Projects

No abstract provided.

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Effects Of Nucleophile Strength On Selectivity In Bibr3 Catalyzed Cyclic Ether Construction, Ajara A. Rahman Jan 2012

Effects Of Nucleophile Strength On Selectivity In Bibr3 Catalyzed Cyclic Ether Construction, Ajara A. Rahman

Dissertations, Theses, and Masters Projects

No abstract provided.

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The Role Of Small Carboxylic Acids During Poly(Amide) 11 Hydrolysis, John-Andrew Samuel Hocker Jan 2012

The Role Of Small Carboxylic Acids During Poly(Amide) 11 Hydrolysis, John-Andrew Samuel Hocker

Dissertations, Theses, and Masters Projects

No abstract provided.

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The Role Of Benthic Nitrogen Fixation As A Source Of New Nitrogen To The New River Estuary, Nc, Meaghan L. Whitehead Jan 2012

The Role Of Benthic Nitrogen Fixation As A Source Of New Nitrogen To The New River Estuary, Nc, Meaghan L. Whitehead

Dissertations, Theses, and Masters Projects

Nitrogen (N) has been shown to limit primary production in many estuarine systems, including the New River Estuary (NRE), NC, a moderately eutrophied system with large areas of photic sediment. The NRE receives major inputs of allochthonous nutrients from agriculture and confined animal feeding operations as well as other sources. Autochthonous sources of N in the NRE include both remineralization and Nfixation. Whereas allochthonous sources are usually most important in winter/spring and during periods of high fresh water discharge, autochthonous sources are likely to become more important in summer. N-fixation, which can be performed by both autotrophic cyanobacteria and heterotrophic …

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A New Model For Simulating Climate Change And Carbon Dynamics In Forested Landscapes, Caren C. Dymond, Robert M. Scheller, Sarah Beukema Jan 2012

A New Model For Simulating Climate Change And Carbon Dynamics In Forested Landscapes, Caren C. Dymond, Robert M. Scheller, Sarah Beukema

Environmental Science and Management Faculty Publications and Presentations

Journal of Ecosystems & Management vol. 13 no. 2 2012 news brief .

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Conformal Cosmology And The Pioneer Anomaly, Gabriele U. Varieschi Jan 2012

Conformal Cosmology And The Pioneer Anomaly, Gabriele U. Varieschi

Physics Faculty Works

No abstract provided.

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Effects Of Visual, Auditory, And Kinesthetic Imagery Interventions On Dancers’ Plié Arabesques, Teresa Heiland, Robert Rovetti Jan 2012

Effects Of Visual, Auditory, And Kinesthetic Imagery Interventions On Dancers’ Plié Arabesques, Teresa Heiland, Robert Rovetti

Mathematics, Statistics and Data Science Faculty Works

The goal of this study was to examine the influence of visual, auditory, and kinesthetic delivery modes of Franklin Method images (anatomical bone rhythms, metaphorical image, and tactile aid, respectively) on the performance of college dancers’ Plié Arabesques by assessing its influence on three measures: plié depth; maintenance of rotation; and simultaneous use of hip, knee, and ankle (Tri-fold). Eighteen participants performed a series of Plié Arabesques during three visits over a period of two months; at each visit, pliés were performed before and after an image intervention, and the change in mean Likert scale rating was calculated for each …

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Spatial Graphs With Local Knots, Erica Flapan, Blake Mellor, Ramin Naimi Jan 2012

Spatial Graphs With Local Knots, Erica Flapan, Blake Mellor, Ramin Naimi

Mathematics, Statistics and Data Science Faculty Works

It is shown that for any locally knotted edge of a 3-connected graph in S3, there is a ball that contains all of the local knots of that edge and is unique up to an isotopy setwise fixing the graph. This result is applied to the study of topological symmetry groups of graphs embedded in S3.

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The Double Cover Of The Real Symplectic Group And A Theme From Feynman’S Quantum Mechanics, Michael Berg Jan 2012

The Double Cover Of The Real Symplectic Group And A Theme From Feynman’S Quantum Mechanics, Michael Berg

Mathematics, Statistics and Data Science Faculty Works

We present a direct connection between the 2-cocycle defining the double cover of the real symplectic group and a Feynman path integral describing the time evolution of a quantum mechanical system.

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A New Topological Perspective On Quantization In Physics, Hooman Rahimizadeh, Stan Sholar, Michael Berg Jan 2012

A New Topological Perspective On Quantization In Physics, Hooman Rahimizadeh, Stan Sholar, Michael Berg

Mathematics, Statistics and Data Science Faculty Works

We propose a new characterization of classical quantization in physics in terms of sheaf cohomology on the site of spacetime as a smooth 4-manifold. The perspective of sheaf cohomology is motivated by a presentation of the Aharonov-Bohm effect in terms of the integration of differential forms.

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Upper Bounds In The Ohtsuki-Riley-Sakuma Partial Order On 2-Bridge Knots, Scott M. Garrabrant, Jim Hoste, Patrick D. Shanahan Jan 2012

Upper Bounds In The Ohtsuki-Riley-Sakuma Partial Order On 2-Bridge Knots, Scott M. Garrabrant, Jim Hoste, Patrick D. Shanahan

Mathematics, Statistics and Data Science Faculty Works

In this paper we use continued fractions to study a partial order on the set of 2-bridge knots derived from the work of Ohtsuki, Riley, and Sakuma. We establish necessary and sufficient conditions for any set of 2-bridge knots to have an upper bound with respect to the partial order. Moreover, given any 2-bridge knot K we characterize all other 2-bridge knots J such that {K, J} has an upper bound. As an application we answer a question of Suzuki, showing that there is no upper bound for the set consisting of the trefoil and figure-eight knots.

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Enhancements Of Rack Counting Invariants Via Dynamical Cocycles, Alissa S. Crans, Sam Nelson, Aparna Sarkar Jan 2012

Enhancements Of Rack Counting Invariants Via Dynamical Cocycles, Alissa S. Crans, Sam Nelson, Aparna Sarkar

Mathematics, Statistics and Data Science Faculty Works

We introduce the notion of N-reduced dynamical cocycles and use these objects to define enhancements of the rack counting invariant for classical and virtual knots and links. We provide examples to show that the new invariants are not determined by the rack counting invariant, the Jones polynomial or the generalized Alexander polynomial.

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On Levi-Civita’S Alternating Symbol, Schouten’S Alternating Unit Tensors, Cpt, And Quantization, Evert Jan Post, Stan Sholar, Hooman Rahimizadeh, Michael Berg Jan 2012

On Levi-Civita’S Alternating Symbol, Schouten’S Alternating Unit Tensors, Cpt, And Quantization, Evert Jan Post, Stan Sholar, Hooman Rahimizadeh, Michael Berg

Mathematics, Statistics and Data Science Faculty Works

The purpose of the present article is to demonstrate that by adopting a unifying differential geometric perspective on certain themes in physics one reaps remarkable new dividends in both microscopic and macroscopic domains. By replacing algebraic objects by tensor-transforming objects and introducing methods from the theory of differentiable manifolds at a very fundamental level we obtain a Kottler-Cartan metric-independent general invariance of the Maxwell field, which in turn makes for a global quantum superstructure for Gauss-Amp`ere and Aharonov-Bohm “quantum integrals.” Beyond this, our approach shows that postulating a Riemannian metric at the quantum level is an unnecessary concept and our …

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How Well Do The Nsf Funded Elementary Mathematics Curricula Align With The Gaise Report Recommendations?, Anna E. Bargagliotti Jan 2012

How Well Do The Nsf Funded Elementary Mathematics Curricula Align With The Gaise Report Recommendations?, Anna E. Bargagliotti

Mathematics, Statistics and Data Science Faculty Works

Statistics and probability have become an integral part of mathematics education. Therefore it is important to understand whether curricular materials adequately represent statistical ideas. The Guidelines for Assessment and Instruction in Statistics Education (GAISE) report (Franklin, Kader, Mewborn, Moreno, Peck, Perry, & Scheaffer, 2007), endorsed by the American Statistical Association, provides a two-dimensional (process and level) framework for statistical learning. This paper examines whether the statistics content contained in the NSF funded elementary curricula Investigations in Number, Data, and Space, Math Trailblazers, and Everyday Mathematics aligns with the GAISE recommendations. Results indicate that there are differences in the approaches used …

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Characterization Of Radially Symmetric Finite Time Blowup In Multidimensional Aggregation Equations, Andrea L. Bertozzi, John B. Garnett, Thomas Laurent Jan 2012

Characterization Of Radially Symmetric Finite Time Blowup In Multidimensional Aggregation Equations, Andrea L. Bertozzi, John B. Garnett, Thomas Laurent

Mathematics, Statistics and Data Science Faculty Works

This paper studies the transport of a mass $\mu$ in $\mathbb{R}^d, d \geq 2,$ by a flow field $v= -\nabla K*\mu$. We focus on kernels $K=|x|^\alpha/ \alpha$ for $2-d\leq \alpha<2$ for which the smooth densities are known to develop singularities in finite time. For this range we prove the existence for all time of radially symmetric measure solutions that are monotone decreasing as a function of the radius, thus allowing for continuation of the solution past the blowup time. The monotone constraint on the data is consistent with the typical blowup profiles observed in recent numerical studies of these singularities. We prove monotonicity is preserved for all time, even after blowup, in contrast to the case $\alpha >2$ where radially symmetric solutions are known to lose monotonicity. In the case of the Newtonian potential ($\alpha=2-d$), under the assumption of radial symmetry the equation can be transformed into the inviscid Burgers equation on a half line. This enables us to prove preservation of monotonicity using the classical theory of conservation laws. In the case $2 -d < \alpha < 2$ and at the critical exponent p we exhibit initial data in $L^p$ for which the solution immediately develops a Dirac mass singularity. This extends recent work on the local ill-posedness of solutions at the critical exponent.

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Convergence Of A Steepest Descent Algorithm For Ratio Cut Clustering, Xavier Bresson, Thomas Laurent, David Uminsky, James H. Von Brecht Jan 2012

Convergence Of A Steepest Descent Algorithm For Ratio Cut Clustering, Xavier Bresson, Thomas Laurent, David Uminsky, James H. Von Brecht

Mathematics, Statistics and Data Science Faculty Works

Unsupervised clustering of scattered, noisy and high-dimensional data points is an important and difficult problem. Tight continuous relaxations of balanced cut problems have recently been shown to provide excellent clustering results. In this paper, we present an explicit-implicit gradient flow scheme for the relaxed ratio cut problem, and prove that the algorithm converges to a critical point of the energy. We also show the efficiency of the proposed algorithm on the two moons dataset.

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Metals And Bacteria Partitioning To Various Size Particles In Ballona Creek Storm Water Runoff, John Dorsey, Jeffrey S. Brown, Eric D. Stein, Drew Ackerman, Jessica Lyon, Patrick M. Carter Jan 2012

Metals And Bacteria Partitioning To Various Size Particles In Ballona Creek Storm Water Runoff, John Dorsey, Jeffrey S. Brown, Eric D. Stein, Drew Ackerman, Jessica Lyon, Patrick M. Carter

Civil and Environmental Engineering Faculty Works

Many storm water best management practice (BMP) devices function primarily by capturing particulate matter to take advantage of the well-documented association between storm water particles and pollutants. The hydrodynamic separation or settling methods used by most BMP devices are most effective at capturing medium to large particles; however, these may not be the most predominant particles associated with urban runoff. The present study examined particle size distribution in storm water runoff from an urban watershed in southern California and investigated the pollutant-particle associations of metals (Cu, Pb, Ni, and Zn) and bacteria (enterococci and Escherichia coli). During small storm events …

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Linear Rank Tests Of Uniformity: Understanding Inconsistent Outcomes And The Construction Of New Tests, Anna E. Bargagliotti Jan 2012

Linear Rank Tests Of Uniformity: Understanding Inconsistent Outcomes And The Construction Of New Tests, Anna E. Bargagliotti

Mathematics, Statistics and Data Science Faculty Works

Several nonparametric tests exist to test for differences among alternatives when using ranked data. Testing for differences among alternatives amounts to testing for uniformity over the set of possible permutations of the alternatives. Well-known tests of uniformity, such as the Friedman test or the Anderson test, are based on the impact of the usual limiting theorems (e.g. central limit theorem) and the results of different summary statistics (e.g. mean ranks, marginals, and pairwise ranks). Inconsistencies can occur among statistical tests' outcomes - different statistical tests can yield different outcomes when applied to the same ranked data. In this paper, we …

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Congrats You’Re Abd! Now What?, Alissa Crans Jan 2012

Congrats You’Re Abd! Now What?, Alissa Crans

Mathematics, Statistics and Data Science Faculty Works

No abstract provided.

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Hypotheses Generation As Supervised Link Discovery With Automated Class Labeling On Large-Scale Biomedical Concept Networks, Jayasimha R. Katukuri, Ying Xie, Vijay Raghavan, Ashish Gupta Jan 2012

Hypotheses Generation As Supervised Link Discovery With Automated Class Labeling On Large-Scale Biomedical Concept Networks, Jayasimha R. Katukuri, Ying Xie, Vijay Raghavan, Ashish Gupta

Faculty Articles

Computational approaches to generate hypotheses from biomedical literature have been studied intensively in recent years. Nevertheless, it still remains a challenge to automatically discover novel, cross-silo biomedical hypotheses from large-scale literature repositories. In order to address this challenge, we first model a biomedical literature repository as a comprehensive network of biomedical concepts and formulate hypotheses generation as a process of link discovery on the concept network. We extract the relevant information from the biomedical literature corpus and generate a concept network and concept-author map on a cluster using Map-Reduce framework. We extract a set of heterogeneous features such as random …

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Why Care About The Past?, Michael L. Nelson, Michele C. Weigle Jan 2012

Why Care About The Past?, Michael L. Nelson, Michele C. Weigle

Computer Science Presentations

A set of slides used in various presentations by the authors to show that replaying an experience via archived web pages is more compelling than reading a summary of the event. Also available on Slideshare.

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Deglacial Variability Of Antarctic Intermediate Water Penetration Into The North Atlantic From Authigenic Neodymium Isotope Ratios, Ruifang C. Xie, Franco Marcantonio, Matthew W. Schmidt Jan 2012

Deglacial Variability Of Antarctic Intermediate Water Penetration Into The North Atlantic From Authigenic Neodymium Isotope Ratios, Ruifang C. Xie, Franco Marcantonio, Matthew W. Schmidt

OES Faculty Publications

Understanding intermediate water circulation across the last deglacial is critical in assessing the role of oceanic heat transport associated with Atlantic Meridional Overturning Circulation variability across abrupt climate events. However, the links between intermediate water circulation and abrupt climate events such as the Younger Dryas (YD) and Heinrich Event 1 (H1) are still poorly constrained. Here, we reconstruct changes in Antarctic Intermediate Water (AAIW) circulation in the subtropical North Atlantic over the past 25 kyr by measuring authigenic neodymium isotope ratios in sediments from two sites in the Florida Straits. Our authigenic Nd isotope records suggest that there was little …

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The Weathering Of Oil After The Deepwater Horizon Oil Spill: Insights From The Chemical Composition Of The Oil From The Sea Surface, Salt Marshes And Sediments, Zhanfei Liu, Jiqing Liu, Qingzhi Zhu, Wei Wu Jan 2012

The Weathering Of Oil After The Deepwater Horizon Oil Spill: Insights From The Chemical Composition Of The Oil From The Sea Surface, Salt Marshes And Sediments, Zhanfei Liu, Jiqing Liu, Qingzhi Zhu, Wei Wu

Faculty Publications

The oil released during the Deepwater Horizon (DWH) oil spill may have both short- and long-time impacts on the northern Gulf of Mexico ecosystems. An understanding of how the composition and concentration of the oil are altered by weathering, including chemical, physical and biological processes, is needed to evaluate the oil toxicity and impact on the ecosystem in the northern Gulf of Mexico. This study examined petroleum hydrocarbons in oil mousse collected from the sea surface and salt marshes, and in oil deposited in sediments adjacent to the wellhead after the DWH oil spill. Oil mousses were collected …

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A Game Theoretic Framework For Communication Decisions In Multi Agent Systems, Tummalapalli Sudhamsh Reddy Jan 2012

A Game Theoretic Framework For Communication Decisions In Multi Agent Systems, Tummalapalli Sudhamsh Reddy

Computer Science and Engineering Dissertations

Communication is the process of transferring information between multiple entities. We study the communication process between different entities that are modeled as multiple agents. To study the interactions between these entities we use Game theory, which is a mathematical tool that is used to model the interactions and decision process of these multiple players/agents. In the presence of multiple players their interactions are generally modelled as a stochastic game.Here we assume that the communication medium, protocols and language are already present in this multiagent system. We address the question of information selection in the communication process.In this thesis, we develop …

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Similarity Measures And Indexing Methods For Time Series And Multiclass Recognition, Alexandra Stefan Jan 2012

Similarity Measures And Indexing Methods For Time Series And Multiclass Recognition, Alexandra Stefan

Computer Science and Engineering Dissertations

This thesis investigates the problem of similarity search in multimedia databases. A key application domain of the proposed work is pattern classification, with emphasis on classification of gestures, handshapes, faces, and time series. A secondary application of the proposed work is efficient similarity search in large biological databases of protein sequences.More specifically, the thesis makes contributions both by defining novel similarity measures, that are used to identify the best database matches, and by proposing methods to improve efficiency. On the topic of similarity measures, the thesis contributes a method for measuring similarity in a database of videos from American Sign …

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From Phenotype To Genotype: A Structured Sparse Learning Framework For Imaging Genetics Studies, Hua Wang Jan 2012

From Phenotype To Genotype: A Structured Sparse Learning Framework For Imaging Genetics Studies, Hua Wang

Computer Science and Engineering Dissertations

Sparsity is one of the intrinsic properties of real-world data, thus sparse representation based learning models have been widely used to simplify data modeling and discover predictive patterns. By enforcing properly designed structured sparsity, one can unify specific data structures with the learning model. We proposed several novel structured sparsity learning models for multi-modal data fusion, heterogeneous tasks integration, and group structured feature selection. We applied our new structured sparse learning methods to the emerging imaging genetics studies by integrating phenotypes and genotypes to discover new biomarkers which are able to characterize neurodegenerative process in the progression of Alzheimer's disease …

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Multi Person Tracking And Querying With Heterogeneous Sensors, Shahina Ferdous Jan 2012

Multi Person Tracking And Querying With Heterogeneous Sensors, Shahina Ferdous

Computer Science and Engineering Dissertations

Tracking the location of a user is considered to be the most fundamental step for creating a context aware application, such as activity monitoring in an assistive environment. This problem becomes very challenging if there are multiple people involved in this scenario. The reason is that any multi-person environment, such as a hospital, demands simultaneous identification and localization mechanisms, thus making the system very complex. In this dissertation, we present a novel, less-intrusive system that uses RFIDs and sensors deployed at various locations of an assistive apartment to continuously track and identify every person in a multi-person assistive environment. Our …

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Independent Dominating Sets In Triangle-Free Graphs, Wayne Goddard, Jeremy Lyle Jan 2012

Independent Dominating Sets In Triangle-Free Graphs, Wayne Goddard, Jeremy Lyle

Faculty Publications

The independent domination number of a graph is the smallest cardinality of an independent set that dominates the graph. In this paper we consider the independent domination number of triangle-free graphs. We improve several of the known bounds as a function of the order and minimum degree, thereby answering conjectures of Haviland.

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2012-2013 Nova Southeastern University Undergraduate Student Catalog, Nova Southeastern University Jan 2012

2012-2013 Nova Southeastern University Undergraduate Student Catalog, Nova Southeastern University

Undergraduate Programs Course Catalogs

No abstract provided.

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