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Articles 1  30 of 87
FullText Articles in Physics
Quantifying Complex Systems Via Computational Fly Swarms, Troy Taylor
Quantifying Complex Systems Via Computational Fly Swarms, Troy Taylor
Senior Theses
Complexity is prevalent both in natural and in humanmade systems, yet is not well understood quantitatively. Qualitatively, complexity describes a phenomena in which a system composed of individual pieces, each having simple interactions with one another, results in interesting bulk properties that would otherwise not exist. One example of a complex biological system is the bird flock, in particular, a starling murmuration. Starlings are known to move in the direction of their neighbors and avoid collisions with fellow starlings, but as a result of these simple movement choices, the flock as a whole tends to exhibit fluidlike movements and form ...
Viscosities, Diffusion Coefficients, And Mixing Times Of Intrinsic Fluorescent Organic Molecules In Brown Limonene Secondary Organic Aerosol And Tests Of The Stokes–Einstein Equation, Dagny A. Ullmann, Mallory L. Hinks, Adrian M. Maclean, Christopher Butenhoff, James W. Grayson, Kelley Barsanti, Jose L. Jimenez, Sergey A. Nizkorodov, Saeid Kamal, Allan K. Bertram
Viscosities, Diffusion Coefficients, And Mixing Times Of Intrinsic Fluorescent Organic Molecules In Brown Limonene Secondary Organic Aerosol And Tests Of The Stokes–Einstein Equation, Dagny A. Ullmann, Mallory L. Hinks, Adrian M. Maclean, Christopher Butenhoff, James W. Grayson, Kelley Barsanti, Jose L. Jimenez, Sergey A. Nizkorodov, Saeid Kamal, Allan K. Bertram
Physics Faculty Publications and Presentations
Viscosities and diffusion rates of organics within secondary organic aerosol (SOA) remain uncertain. Using the beadmobility technique, we measured viscosities as a function of water activity (a_{w}) of SOA generated by the ozonolysis of limonene followed by browning by exposure to NH_{3} (referred to as brown limonene SOA or brown LSOA). These measurements together with viscosity measurements reported in the literature show that the viscosity of brown LSOA increases by 3–5 orders of magnitude as the aw decreases from 0.9 to approximately 0.05. In addition, we measured diffusion coefficients of intrinsic fluorescent organic molecules within ...
Hydrodynamics Of Smectic Liquid Crystal Films, Eric Minor
Hydrodynamics Of Smectic Liquid Crystal Films, Eric Minor
Undergraduate Honors Theses
Smectic A and C liquid crystals are capable of forming incredibly thin films, discretized by the number of molecular layers. This property makes liquid crystal films ideal for studying 2D hydrodynamics, a field of great interest both due to its fundamental importance to physics and because of its applications to biological systems. The phospholipid bilayer which makes up cell membranes is itself an ideal 2D fluid as it consists of only two layers of phospholipids, however cell membranes are incredibly small and difficult to work worth. Liquid crystal films can be several millimeters across and stable for long periods of ...
Pore Diameter Dependence Of Catalytic Activity: PNitrobenzaldehyde Conversion To An Aldol Product In AmineFunctionalized Mesoporous Silica, Andres Garcia, Igor I. Slowing, James W. Evans
Pore Diameter Dependence Of Catalytic Activity: PNitrobenzaldehyde Conversion To An Aldol Product In AmineFunctionalized Mesoporous Silica, Andres Garcia, Igor I. Slowing, James W. Evans
Chemistry Publications
The reaction yield for conversion of pnitrobenzaldehyde (PNB) to an aldol product in aminefunctionalized mesoporous silica nanoparticles (MSN) exhibits a 20fold enhancement for a modest increase in pore diameter, d. This enhanced catalytic activity is shown to reflect a strong increase in the “passing propensity,” 𝒫, of reactant and product species inside the pores. We find that 𝒫 ≈ 0, corresponding to singlefile diffusion, applies for the smallest d which still significantly exceeds the linear dimensions of PNB and the aldol product. However, in this regime of narrow pores, these elongated species must align with each other and with the pore ...
Imaging The ThreeDimensional Orientation And Rotational Mobility Of Fluorescent Emitters Using The TriSpot Point Spread Function, Oumeng Zhang, Jin Lu, Tianben Ding, Matthew D. Lew
Imaging The ThreeDimensional Orientation And Rotational Mobility Of Fluorescent Emitters Using The TriSpot Point Spread Function, Oumeng Zhang, Jin Lu, Tianben Ding, Matthew D. Lew
Electrical & Systems Engineering Publications and Presentations
Fluorescence photons emitted by single molecules contain rich information regarding their rotational motions, but adapting singlemolecule localization microscopy (SMLM) to measure their orientations and rotational mobilities with high precision remains a challenge. Inspired by dipole radiation patterns, we design and implement a Trispot point spread function (PSF) that simultaneously measures the threedimensional orientation and the rotational mobility of dipolelike emitters across a large field of view. We show that the orientation measurements done using the Trispot PSF are sufficiently accurate to correct the anisotropybased localization bias, from 30 nm to 7 nm, in SMLM. We further characterize the emission anisotropy ...
Physical Lens On The Cell: Advanced Diffusion And The FokkerPlanck Picture, Daniel M. Zuckerman
Physical Lens On The Cell: Advanced Diffusion And The FokkerPlanck Picture, Daniel M. Zuckerman
Scholar Archive
On the one hand, the basics of diffusion seem easy to understand: random motion, a Gaussian distribution of steps, and linear (in time) meansquared distance behavior. On the other hand, the diffusion equation is a partial differential equation ... and it only describes simple diffusion, whereas observed diffusion in cells is rarely simple and requires still more complicated math. Here you can deepen your understanding of the math and physics underlying diffusive behavior.
The Computational Study Of Fly Swarms & Complexity, Austin Bebee
The Computational Study Of Fly Swarms & Complexity, Austin Bebee
Senior Theses
A system is considered complex if it is composed of individual parts that abide by their own set of rules, while the system, as a whole, will produce nondeterministic properties. This prevents the behavior of such systems from being accurately predicted. The motivation for studying complexity spurs from the fact that it is a fundamental aspect of innumerable systems. Among complex systems, fly swarms are relatively simple, but even so they are still not well understood. In this research, several computational models were developed to assist with the understanding of fly swarms. These models were primarily analyzed by using the ...
The AdvectionDiffusion Equation And The Enhanced Dissipation Effect For Flows Generated By Hamiltonians, Michael Kumaresan
The AdvectionDiffusion Equation And The Enhanced Dissipation Effect For Flows Generated By Hamiltonians, Michael Kumaresan
All Dissertations, Theses, and Capstone Projects
We study the Cauchy problem for the advectiondiffusion equation when the diffusive parameter is vanishingly small. We consider two cases  when the underlying flow is a shear flow, and when the underlying flow is generated by a Hamiltonian. For the former, we examine the problem on a bounded domain in two spatial variables with Dirichlet boundary conditions. After quantizing the system via the Fourier transform in the first spatial variable, we establish the enhanceddissipation effect for each mode. For the latter, we allow for nondegenerate critical points and represent the orbits by points on a Reeb graph, with vertices representing ...
Fractional Brownian Motion With A Reflecting Wall, Alexander H. O. Wada, Thomas Vojta
Fractional Brownian Motion With A Reflecting Wall, Alexander H. O. Wada, Thomas Vojta
Physics Faculty Research & Creative Works
Fractional Brownian motion, a stochastic process with longtime correlations between its increments, is a prototypical model for anomalous diffusion. We analyze fractional Brownian motion in the presence of a reflecting wall by means of Monte Carlo simulations. Whereas the meansquare displacement of the particle shows the expected anomalous diffusion behavior (x^{2}) ~ t^{α}, the interplay between the geometric confinement and the longtime memory leads to a highly nonGaussian probability density function with a powerlaw singularity at the barrier. In the superdiffusive case α > 1, the particles accumulate at the barrier leading to a divergence of the probability density. For ...
Translational And Rotational Mobilities Of Inclusions Near The Boundary Of A Smectic Liquid Crystal Film, Ian Cadenhead
Translational And Rotational Mobilities Of Inclusions Near The Boundary Of A Smectic Liquid Crystal Film, Ian Cadenhead
Undergraduate Honors Theses
In recent times the properties of quasitwodimensional films, similar to biological membranes, have been opened up to experimentation through freelysuspended liquid crystal films. These films, with an extremely thin, quantized thickness, can extend across relatively large distances of up to centimeters, and behave like a fluid in the film plane. The motion of isolated inclusions in these films, described by the inclusion’s mobility, is governed by Brownian motion has been extensively modeled and observed. This thesis will examine the behavior of isotropic inclusions near the boundary of a liquid crystal film. This is done by observing three modes of ...
Investigation Of Iron Oxide Nanocolloidal Suspension Diffusion Using A Direct Imaging Method, Ashley E. Rice, Ana Oprisan
Investigation Of Iron Oxide Nanocolloidal Suspension Diffusion Using A Direct Imaging Method, Ashley E. Rice, Ana Oprisan
Journal of the South Carolina Academy of Science
We performed a set of experiments using a direct imaging method to investigate the diffusion process of iron oxide, Fe_{2}O_{3}, nanoparticles. We studied concentration fluctuations that move against the concentration gradient and induce disturbances in the interface between the iron oxide suspension and water in the sample cell. Using this imaging method in combination with the differential dynamic algorithm for image processing, we are able to extract information about the power, size, and lifetime of the fluctuations. We performed this experiment both in the presence and in the absence of a 4.2 mT magnetic field. We ...
Analysis Of Residence Time In The Measurement Of Radon Activity By Passive Diffusion In An Open Volume: A MicroStatistical Approach, Mark P. Silverman
Analysis Of Residence Time In The Measurement Of Radon Activity By Passive Diffusion In An Open Volume: A MicroStatistical Approach, Mark P. Silverman
Faculty Scholarship
Residence time in a flow measurement of radioactivity is the time spent by a predetermined quantity of radioactive sample in the flow cell. In a recent report of the measurement of indoor radon by passive diffusion in an open volume (i.e. no flow cell or control volume), the concept of residence time was generalized to apply to measurement conditions with random, rather than directed, flow. The generalization, leading to a quantity r ∆t , involved use of a) a phenomenological alphaparticle range function to calculate the effective detection volume, and b) a phenomenological description of diffusion by Fick’s law ...
Application Of The FokkerPlanck Molecular Mixing Model To Turbulent Scalar Mixing Using Moment Methods, Ehsan MadadiKandjani, Rodney O. Fox, Alberto Passalacqua
Application Of The FokkerPlanck Molecular Mixing Model To Turbulent Scalar Mixing Using Moment Methods, Ehsan MadadiKandjani, Rodney O. Fox, Alberto Passalacqua
Chemical and Biological Engineering Publications
An extended quadrature method of moments using the beta kernel density function (betaEQMOM) is used to approximate solutions to the evolution equation for univariate and bivariate composition probability distribution functions (PDFs) of a passive scalar for binary and ternary mixing. The key element of interest is the molecular mixing term, which is described using the FokkerPlanck (FP) molecular mixing model. The direct numerical simulations (DNSs) of Eswaran and Pope ["Direct numerical simulations of the turbulent mixing of a passive scalar,"Phys. Fluids 31, 506 (1988)] and the amplitude mapping closure (AMC) of Pope ["Mapping closures for turbulent mixing and reaction ...
Transition Metals On The (0001) Surface Of Graphite: Fundamental Aspects Of Adsorption, Diffusion, And Morphology, David Victor Appy, Huaping Lei, CaiZhuang Wang, Michael C. Tringides, DaJiang Liu, James W. Evans, Patricia A. Thiel
Transition Metals On The (0001) Surface Of Graphite: Fundamental Aspects Of Adsorption, Diffusion, And Morphology, David Victor Appy, Huaping Lei, CaiZhuang Wang, Michael C. Tringides, DaJiang Liu, James W. Evans, Patricia A. Thiel
Patricia A. Thiel
In this article, we review basic information about the interaction of transition metal atoms with the (0001) surface of graphite, especially fundamental phenomena related to growth. Those phenomena involve adatomsurface bonding, diffusion, morphology of metal clusters, interactions with steps and sputterinduced defects, condensation, and desorption. General traits emerge which have not been summarized previously. Some of these features are rather surprising when compared with metalonmetal adsorption and growth. Opportunities for future work are pointed out.
Towards A Prediction Of Landscape Evolution From Chemical Weathering And Soil Production, Eric Alan Jackson
Towards A Prediction Of Landscape Evolution From Chemical Weathering And Soil Production, Eric Alan Jackson
Browse all Theses and Dissertations
The time evolution of a periodic landscape under the influence of chemical weathering and physical erosion is computed. The model used incorporates weathering and soil production as a flux limited reaction controlled by groundwater flow. Scaling of the flow rate is obtained from a percolation theoretic treatment. The erosion of the soil material produced by this process is modeled by the diffusion of elevation, as consistent with downslope soil transport proportional to the tangent of the angle of the topography, and application of the equation of continuity to surface soil transport. Three initial topographies are examined over a periods of ...
Stochastic Modeling Of Catalytic Processes In Nanoporous Materials: Beyond MeanField Approach, Andres Garcia
Stochastic Modeling Of Catalytic Processes In Nanoporous Materials: Beyond MeanField Approach, Andres Garcia
Graduate Theses and Dissertations
Transport and reaction in zeolites and other porous materials, such as mesoporous silica particles, has been a focus of interest in recent years. This is in part due to the possibility of anomalous transport effect (e.g. singlefile diffusion) and its impact in the reaction yield in catalytic processes. Computational simulations are often used to study these complex nonequilibrium systems. Computer simulations using Molecular Dynamics (MD) techniques are prohibitive, so instead coarse grained onedimensional models with the aid of Kinetic Monte Carlo (KMC) simulations are used. Both techniques can be computationally expensive, both time and resource wise. These coarsegrained systems ...
Nanostructure Control: Nucleation And Diffusion Studies For Predictable Ultra Thin Film Morphologies, Matthew Hershberger
Nanostructure Control: Nucleation And Diffusion Studies For Predictable Ultra Thin Film Morphologies, Matthew Hershberger
Graduate Theses and Dissertations
This thesis covers PhD research on two systems with unique and interesting physics. The first system is lead (Pb) deposited on the silicon (111) surface with the 7x7 reconstruction. Pb and Si are mutually bulk insolubility resulting in this system being an ideal case for studying metal and semiconductor interactions. Initial Pb deposition causes an amorphous wetting layer to form across to surface. Continued deposition results in Pb(111) island growth. Classic literature has classified this system as the StranskiKrastanov growth mode although the system is not near equilibrium conditions. Our research shows a growth mode distinctly different than classical ...
Using Underground Radon To Detect Inactive Geological Faults, Germán Rodríguez Ortiz
Using Underground Radon To Detect Inactive Geological Faults, Germán Rodríguez Ortiz
Open Access Theses & Dissertations
This Thesis presents the results of an investigation of the concentration of radon in soil around a fault in the East Franklin Mountains in the El Paso area in West Texas. The connection between underground radon exhalations near active faults has been known for decades, but possible similar increases of underground radon levels around inactive faults have not been studied as thoroughly. Arguing that the dilatancydiffusion model used to explain the phenomenon near active faults does not apply to the case of inactive faults, a hypoThesis is formulated under which increased levels of underground radon must be present near inactive ...
Single Particle Tracking: Analysis Techniques For Live Cell Nanoscopy., Peter K. Relich
Single Particle Tracking: Analysis Techniques For Live Cell Nanoscopy., Peter K. Relich
Physics & Astronomy ETDs
Single molecule experiments are a set of experiments designed specifically to study the properties of individual molecules. It has only been in the last three decades where single molecule experiments have been applied to the life sciences; where they have been successfully implemented in systems biology for probing the behaviors of subcellular mechanisms. The advent and growth of superresolution techniques in single molecule experiments has made the fundamental behaviors of light and the associated nanoprobes a necessary concern among life scientists wishing to advance the state of human knowledge in biology. This dissertation disseminates some of the practices learned in ...
Point Island Models For Nucleation And Growth Of Supported Nanoclusters During Surface Deposition, Yong Han, Émilie Gaudry, Tiago J. Oliveira, James W. Evans
Point Island Models For Nucleation And Growth Of Supported Nanoclusters During Surface Deposition, Yong Han, Émilie Gaudry, Tiago J. Oliveira, James W. Evans
Physics and Astronomy Publications
Point island models (PIMs) are presented for the formation of supported nanoclusters (or islands) during deposition on flat crystalline substrates at lower submonolayer coverages. These models treat islands as occupying a single adsorption site, although carrying a label to track their size (i.e., they suppress island structure). However, they are particularly effective in describing the island size and spatial distributions. In fact, these PIMs provide fundamental insight into the key features for homogeneous nucleation and growth processes on surfaces. PIMs are also versatile being readily adapted to treat both diffusionlimited and attachmentlimited growth and also a variety of other ...
Catalytic Conversion In Nanoporous Materials: Concentration Oscillations And Spatial Correlations Due To Inhibited Transport And Intermolecular Interactions, Andrés García, James W. Evans
Catalytic Conversion In Nanoporous Materials: Concentration Oscillations And Spatial Correlations Due To Inhibited Transport And Intermolecular Interactions, Andrés García, James W. Evans
Physics and Astronomy Publications
We show that steadystate catalytic conversion in nanoporous materials can occur in a quasicounterdiffusion mode with the reactant (product) concentration strongly decaying (growing) into the pore, but also with oscillations in the total concentration. These oscillations reflect the response of the fluid to the transition from an extended to a confined environment near the pore opening. We focus on the regime of strongly inhibited transport in narrow pores corresponding to singlefile diffusion. Here, limited penetration of the reactant into the pores and the associated low reaction yield is impacted by strong spatial correlations induced by both reaction (nonequilibrium correlations) and ...
Method To Measure Indoor Radon Concentration In An Open Volume With GeigerMueller Counters: Analysis From First Principles, Mark P. Silverman
Method To Measure Indoor Radon Concentration In An Open Volume With GeigerMueller Counters: Analysis From First Principles, Mark P. Silverman
Faculty Scholarship
A simple method employing a pair of pancakestyle GeigerMueller (GM) counters for quantitative measurement of radon activity concentration (activity per unit volume) is described and demonstrated. The use of two GM counters, together with the basic theory derived in this paper, permit the detection of alpha particles from decay of 222Rn and progeny ( 218 Po , 214 Po ) and the conversion of the alpha count rate into a radon concentration. A unique feature of this method, in comparison with standard methodologies to measure radon concentration, is the absence of a fixed control volume. Advantages afforded by the reported GM method include ...
Method To Measure Indoor Radon Concentration In An Open Volume With GeigerMueller Counters: Analysis From First Principles, Mark P. Silverman
Method To Measure Indoor Radon Concentration In An Open Volume With GeigerMueller Counters: Analysis From First Principles, Mark P. Silverman
Faculty Scholarship
A simple method employing a pair of pancakestyle GeigerMueller (GM) counters for quantitative measurement of radon activity concentration (activity per unit volume) is described and demonstrated. The use of two GM counters, together with the basic theory derived in this paper, permit the detection of alpha particles from decay of 222Rn and progeny ( 218Po , 214 Po ) and the conversion of the alpha count rate into a radon concentration. A unique feature of this method, in comparison with standard methodologies to measure radon concentration, is the absence of a fixed control volume. Advantages afforded by the reported GM method include: 1 ...
AdiabaticNonadiabatic Transition In The Diffusive Hamiltonian Dynamics Of A Classical Holstein Polaron, Alex A. Silvius, Paul Ernest Parris, Stephan De Bièvre
AdiabaticNonadiabatic Transition In The Diffusive Hamiltonian Dynamics Of A Classical Holstein Polaron, Alex A. Silvius, Paul Ernest Parris, Stephan De Bièvre
Paul E. Parris
We study the Hamiltonian dynamics of a free particle injected onto a chain containing a periodic array of harmonic oscillators in thermal equilibrium. The particle interacts locally with each oscillator, with an interaction that is linear in the oscillator coordinate and independent of the particle's position when it is within a finite interaction range. At long times the particle exhibits diffusive motion, with an ensemble averaged meansquared displacement that is linear in time. The diffusion constant at high temperatures follows a power law D~T 5/2 for all parameter values studied. At low temperatures particle transport changes to ...
Classical Transport In Disordered Systems, Antonios Papaioannou
Classical Transport In Disordered Systems, Antonios Papaioannou
All Dissertations, Theses, and Capstone Projects
This thesis reports on the manifestation of structural disorder on molecular transport and it consists of two parts. Part I discusses the relations between classical transport and the underlying structural complexity of the system. Both types of molecular diffusion, namely Gaussian and nonGaussian are presented and the relevant time regimes are discussed. In addition the concept of structural universality is introduced and connected with the diffusion metrics. One of the most robust techniques for measuring molecular mean square displacements is magnetic resonance. This method requires encoding and subsequently reading out after an experimentally controlled time, a phase ϕ to the ...
Tunable Controlled Release Of Molecular Species From Halloysite Nanotubes, Divya Narayan Elumalai
Tunable Controlled Release Of Molecular Species From Halloysite Nanotubes, Divya Narayan Elumalai
Doctoral Dissertations
Encouraged by potential applications in rust coatings, selfhealing composites, selective delivery of drugs, and catalysis, the transport of molecular species through Halloysite nanotubes (HNTs), specifically the storage and controlled release of these molecules, has attracted strong interest in recent years. HNTs are a naturally occurring biocompatible nanomaterial that are abundantly and readily available. They are alumosilicate based tubular clay nanotubes with an inner lumen of 15 nm and a length of 600900 nm. The size of the inner lumen of HNTs may be adjusted by etching. The lumen can be loaded with functional agents like antioxidants, anticorrosion agents, flameretardant agents ...
Excitonic Processes, Energy Transport, And Excited States In Organic Materials, Vincent Sean Zoutenbier
Excitonic Processes, Energy Transport, And Excited States In Organic Materials, Vincent Sean Zoutenbier
Theses and Dissertations
This dissertation has roots in the distinctly human endeavor to harness energy. We study singlet exciton fission, which has the remarkable ability to double the number of energy carriers (excitons) through singlet fission, and its reverse process triplet fusion, which can combine triplet excitons. Understanding the fundamental mechanisms that enable singlet fission may allow for it to be engineered for use with other materials for solar cell applications.We experimentally investigate the creation of singlet and triplet excitons in rubrene single crystals, how one species can convert into the other by excitonic fission and fusion processes, and how triplet excitons ...
Understanding Electrical Conduction In Lithium Ion Batteries Through MultiScale Modeling, Jie Pan
Understanding Electrical Conduction In Lithium Ion Batteries Through MultiScale Modeling, Jie Pan
Theses and DissertationsChemical and Materials Engineering
Silicon (Si) has been considered as a promising negative electrode material for lithium ion batteries (LIBs) because of its high theoretical capacity, low discharge voltage, and low cost. However, the utilization of Si electrode has been hampered by problems such as slow ionic transport, large stress/strain generation, and unstable solid electrolyte interphase (SEI). These problems severely influence the performance and cycle life of Si electrodes. In general, ionic conduction determines the rate performance of the electrode, while electron leakage through the SEI causes electrolyte decomposition and, thus, causes capacity loss. The goal of this thesis research is to design ...
Hydrodynamic Analogues Of Hamiltonian Systems, Francisco J. Jauffred
Hydrodynamic Analogues Of Hamiltonian Systems, Francisco J. Jauffred
Graduate Masters Theses
A onedimensional Hamiltonian system can be modeled and understood as a twodimensional incompressible fluid in phase space. In this sense, the chaotic behavior of onedimensional time dependent Hamiltonians corresponds to the mixing of twodimensional fluids. Amey (2012) studied the characteristic values of one such system and found a scaling law governing them. We explain this scaling law as a diffusion process occurring in an elliptical region with very low eccentricity. We prove that for such a scaling law to occur, it is necessary for a vorticity field to be present. Furthermore, we show that a conformal mapping of an incompressible ...
Gelatin Diffusion Experiment, Jennifer Welborn
Gelatin Diffusion Experiment, Jennifer Welborn
Nanotechnology Teacher Summer Institutes
In this activity, nanotech participants will:
 See how food dyes and gelatin are used to model the delivery of nanoscale medicines to cells in the human body  Measure diffusion distances of 3 different colors of food dye by: Eye, photo image on a computer, ADI software (Analyzing Digital Images) Some useful websites:
 http://www.echalk.co.uk/Science/biologyContent.htm Life Processes and Cells
 http://workbench.concord.org/database/activities/321.html Molecular Workbench Database. Diffusion, osmosis, ...