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Search Results: 1 - 10 of 2686 matches for " Meagan Lang "
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Bar Formation from Galaxy Flybys
Meagan Lang,Kelly Holley-Bockelmann,Manodeep Sinha
Physics , 2014, DOI: 10.1088/2041-8205/790/2/L33
Abstract: Recently, both simulations and observations have revealed that flybys - fast, one-time interactions between two galaxy halos - are surprisingly common, nearing/comparable to galaxy mergers. Since these are rapid, transient events with the closest approach well outside the galaxy disk, it is unclear if flybys can transform the galaxy in a lasting way. We conduct collisionless N-body simulations of three co-planer flyby interactions between pure-disk galaxies to take a first look at the effects flybys have on disk structure, with particular focus on stellar bar formation. We find that some flybys are capable of inciting a bar with bars forming in both galaxies during our 1:1 interaction and in the secondary during our 10:1 interaction. The bars formed have ellipticities >0.5, sizes on the order of the host disk's scale length, and persist to the end of our simulations, ~5 Gyr after pericenter. The ability of flybys to incite bar formation implies that many processes associated with secular bar evolution may be more closely tied with interactions than previously though.
Voronoi Tessellation and Non-parametric Halo Concentration
Meagan Lang,Kelly Holley-Bockelmann,Manodeep Sinha
Physics , 2015, DOI: 10.1088/0004-637X/811/2/152
Abstract: We present and test TesseRACt, a non-parametric technique for recovering the concentration of simulated dark matter halos using Voronoi tessellation. TesseRACt is tested on idealized N-body halos that are axisymmetric, triaxial, and contain substructure and compared to traditional least-squares fitting as well as two non-parametric techniques that assume spherical symmetry. TesseRACt recovers halo concentrations within 0.3% of the true value regardless of whether the halo is spherical, axisymmetric, or triaxial. Traditional fitting and non-parametric techniques that assume spherical symmetry can return concentrations that are systematically off by as much as 10% from the true value for non-spherical halos. TesseRACt also performs significantly better when there is substructure present outside $0.5R_{200}$. Given that cosmological halos are rarely spherical and often contain substructure, we discuss implications for studies of halo concentration in cosmological N-body simulations including how choice of technique for measuring concentration might bias scaling relations.
The Value of Color Research in Brand Strategy  [PDF]
Meagan K. Cunningham
Open Journal of Social Sciences (JSS) , 2017, DOI: 10.4236/jss.2017.512014
Abstract:
Is color more than a design? The following research discusses the science of color to consumer perception and the value of that color research to consumer-brand relationships. Specifically, it examines how color influences consumers’ perception and how brands strategically utilize color to distinguish themselves amongst competitors, establish an identity, promote an image, and foster relationships with its consumers. To examine the significance of color to consumer perception and brand imagery, a nonrandom sample of men and women between the ages of 18 and 37 years old participated in a focus group that included color-centric photos and a survey. The results of the nonrandom sample also show that colors used in branding influence consumers’ perception, are used to identify products, and carry meaning that’s evolved into a relationship between the brand and the consumer. These findings were consistent with previous research that found through color, brands effectively establish an identity, communicate a mood, and form a relationship with consumers (Labrecque and Milne, 2011) [1]. The results of the survey also reveal that consumers don’t rely solely on color when recognizing a branding and more can be done to examine how integral color is to manufacturing brand-consumer relationships.
Can a Satellite Galaxy Merger Explain the Active Past of the Galactic Center?
Meagan Lang,Kelly Holley-Bockelmann,Tamara Bogdanovic,Pau Amaro-Seoane,Alberto Sesana,Manodeep Sinha
Physics , 2011,
Abstract: Observations of the Galactic Center (GC) have accumulated a multitude of "forensic" evidence indicating that several million years ago the center of the Milky Way galaxy was teaming with starforming and accretion-powered activity -- this paints a rather different picture from the GC as we understand it today. We examine a possibility that this epoch of activity could have been triggered by the infall of a satellite galaxy into the Milky Way which began at the redshift of 10 and ended few million years ago with a merger of the Galactic supermassive black hole with an intermediate mass black hole brought in by the inspiralling satellite.
Action Research and Music Therapy: Group Music Therapy with Young Refugees in a School Community
Meagan Hunt
Voices: A World Forum for Music Therapy , 2005,
Abstract:
Towards Topological Quantum Computation? - Knotting and Fusing Flux Tubes
Meagan B. Thompson
Physics , 2010,
Abstract: Models for topological quantum computation are based on braiding and fusing anyons (quasiparticles of fractional statistics) in (2+1)-D. The anyons that can exist in a physical theory are determined by the symmetry group of the Hamiltonian. In the case that the Hamiltonian undergoes spontaneous symmetry breaking of the full symmetry group G to a finite residual gauge group H, particles are given by representations of the quantum double $D(H)$ of the subgroup. The quasi-triangular Hopf Algebra D(H) is obtained from Drinfeld's quantum double construction applied to the algebra F(H) of functions on the finite group H. A major new contribution of this work is a program written in MAGMA to compute the particles (and their properties - including spin) that can exist in a system with an arbitrary finite residual gauge group, in addition to the braiding and fusion rules for those particles. We compute explicitly the fusion rules for two non-abelian group doubles suggested for universal quantum computation: $S_3$ and $A_5$, and discover some interesting results, subsystems, and symmetries in the tables. SO(3)_4 (the restriction of Chern-Simons theory $SU(2)_4$) and its mirror image are discovered as 3-particle subsystems in the 8-particle $S_3$ quantum double. The tables demonstrate that both $S_3$ and $A_5$ anyons are all Majorana, but this is not the case for all finite groups. In the appendices, the quantum doubles for the remaining nonabelian subgroups of SO(3) - $S_4$, $A_4$, and $D_4$ (the second in the infinite family $D_n$) - are tabulated and analyzed. In addition, the probabilities of obtaining any given fusion product in quantum computation applications are determined and programmed in MAGMA. Throughout, connections to possible experiments are mentioned.
Identification of Unique Blood and Urine Biomarkers in Influenza Virus and Staphylococcus aureus Co-infection: A Preliminary Study
Meagan A. Prescott,Manoj K. Pastey
Biomarker Insights , 2010,
Abstract:
Phosphorus Mass Balance of the Illinois River Watershed in Arkansas and Oklahoma  [PDF]
Bernard Engel, Meagan Smith, John Berton Fisher, Roger Olsen, Laurent Ahiablame
Journal of Water Resource and Protection (JWARP) , 2013, DOI: 10.4236/jwarp.2013.56060
Abstract:

Water quality degradation in the Illinois River Watershed (IRW) has been linked to excess nutrients, primarily phosphorus (P). A mass balance study was performed on the IRW in Oklahoma and Arkansas to quantify the magnitude of P entering the watershed between the closure of Lake Tenkiller’s dam in 1954 to 2006. Results showed that a substantial mass of P was, and is, being imported into the watershed relative to the mass of P leaving the watershed. The study demonstrated that poultry production has been the major contributor of P imported to the watershed since 1964, and is currently responsible for more than 76% of the net annual P additions to the IRW. Between 1949 and 2002, more than 200,000 tonnes of P was added to the IRW. A P delivery ratio for the IRW was computed from the mass balance results and observed loads indicating that 4% of annual P applied to the IRW landscape reached Lake Tenkiller between 1999 and 2006. Allocation of P loads from 1949 to 2002 to Lake Tenkiller computed with the delivery ratio showed that wastewater treatment plant (WWTP) discharges were responsible for more than 50% of P reaching Lake Tenkiller in 1949, followed by dairy cattle (32% of loads). Poultry contribution to P reaching Lake Tenkiller was 5% in 1949 but increased rapidly to become the largest source in 1969 at approximately 49%, and in 2002 at 54%. Both dairy and WWTP portions of the loads declined from 1949 levels with less than 4% attributable to dairy and less than 34% assigned to WWTP in 2002.

The Study of Multi-Expression Classification Algorithm Based on Adaboost and Mutual Independent Feature  [PDF]
Liying Lang, Zuntao Hu
Journal of Signal and Information Processing (JSIP) , 2011, DOI: 10.4236/jsip.2011.24038
Abstract: In the paper conventional Adaboost algorithm is improved and local features of face such as eyes and mouth are separated as mutual independent elements for facial feature extraction and classification. The multi-expression classification algorithm which is based on Adaboost and mutual independent feature is proposed. In order to effectively and quickly train threshold values of weak classifiers of features, Sample of training is carried out simple improvement. We obtain a good classification results through experiments.
The Initial Boundary Value Problem for Modified Zakharov System  [PDF]
Lang Li, Shaomei Fang
Advances in Pure Mathematics (APM) , 2015, DOI: 10.4236/apm.2015.55028
Abstract:

In this paper, we consider the initial boudary value problem for modified Zakharov system in 3 dimensions with small initial condition. By using the continuity lemma and the linear interpolation theory, together with the properties of Sobolev spaces and the Galerkin method, we obtain the existence and uniqueness of the global solution.

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