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Articles 1  30 of 222
FullText Articles in Statistical, Nonlinear, and Soft Matter Physics
From Critical Behavior To Catastrophic Runaways: Comparing Sheared Granular Materials With Bulk Metallic Glasses, Alan A. Long, Dmitry Denisov, Peter Schall, Todd C. Hufnagel, Xiaojun Gu, Wendelin J. Wright, Karin A. Dahmen
From Critical Behavior To Catastrophic Runaways: Comparing Sheared Granular Materials With Bulk Metallic Glasses, Alan A. Long, Dmitry Denisov, Peter Schall, Todd C. Hufnagel, Xiaojun Gu, Wendelin J. Wright, Karin A. Dahmen
Faculty Journal Articles
The flow of granular materials and metallic glasses is governed by strongly correlated, avalanchelike deformation. Recent comparisons focused on the scaling regimes of the small avalanches, where strong similarities were found in the two systems. Here, we investigate the regime of large avalanches by computing the temporal profile or “shape” of each one, i.e., the time derivative of the stresstime series during each avalanche. We then compare the experimental statistics and dynamics of these shapes in granular media and bulk metallic glasses. We complement the experiments with a meanfield model that predicts a critical size beyond which avalanches turn ...
Force Oscillations Distort Avalanche Shapes, Louis W. Mcfaul, Wendelin J. Wright, Jordan Sickle, Karin A. Dahmen
Force Oscillations Distort Avalanche Shapes, Louis W. Mcfaul, Wendelin J. Wright, Jordan Sickle, Karin A. Dahmen
Faculty Journal Articles
Contradictory scaling behavior in experiments testing the principle of universality may be due to external oscillations. Thus, the effect of damped oscillatory external forces on slip avalanches in slowly deformed solids is simulated using a meanfield model. Akin to a resonance effect, oscillatory driving forces change the dynamics of avalanches with durations close to the oscillation period. This problem can be avoided by tuning mechanical resonance frequencies away from the range of the inverse avalanche durations. The results provide critical guidance for experimental tests for universality and a quantitative understanding of avalanche dynamics under a wide range of driving conditions.
Stability And Application Of The KCore Dynamical Model To Biological Networks, Francesca Beatrice Arese Lucini
Stability And Application Of The KCore Dynamical Model To Biological Networks, Francesca Beatrice Arese Lucini
All Dissertations, Theses, and Capstone Projects
The objective of the dissertation is to illustrate the importance of the kcore dynamical model, by first presenting the stability analysis of the nonlinear kcore model and compare its solution to the most widely used linear model. Second, I show a real world application of the kcore model to describe properties of neural networks, specifically, the transition from conscious to subliminal perception.
Inference Of Language Functional Network In Healthy, Cancerous And Bilingual Brains By Fmri And Network Modeling, Qiongge Li
All Dissertations, Theses, and Capstone Projects
We study the underlying mechanism by which language processing occurs in the human brain using inference methods on functional magnetic resonance imaging data. The data analyzed stems from several cohorts of subjects; a monolingual group, a bilingual group, a healthy control group and one diseased case. We applied a complex statistical inference pipeline to determine the network structure of brain components involved with language. This healthy network reveals a fully connected triangular relationship between the preSupplementary Motor Area (preSMA), the Broca's Area (BA), and the ventral PreMotor Area (PreMA) in the left hemisphere. This "triangle'' shows consistently in all ...
Development Of A 1Dimensional Data Assimilation To Determine Temperature And Relative Humidity Combining Raman Lidar Backscatter Measurements And A Reanalysis Model, Shayamila N. Mahagammulla Gamage
Development Of A 1Dimensional Data Assimilation To Determine Temperature And Relative Humidity Combining Raman Lidar Backscatter Measurements And A Reanalysis Model, Shayamila N. Mahagammulla Gamage
Electronic Thesis and Dissertation Repository
Water vapor is the most dominant greenhouse gas in Earth's atmosphere. It is highly variable and its variations strongly depend on changes in temperature. Atmospheric water vapor can be expressed as relative humidity (RH), the ratio of the partial pressure of water vapor in the mixture to the equilibrium vapor pressure of water over a flat surface of pure water at a given temperature. Liquid water can exist as supercooled water for temperatures between 0C to 38C. Thus, RH can be measured either relative to water (RHw) or to ice (RHi). RHi measurements are important in the upper tropospheric ...
Application Of The Optimal Estimation Method (Oem) To Retrieve Relative Humidity From Raman Lidar Backscatter Measurements., Shayamila N. Mahagammulla Gamage, Robert Sica, Alexander Haefele
Application Of The Optimal Estimation Method (Oem) To Retrieve Relative Humidity From Raman Lidar Backscatter Measurements., Shayamila N. Mahagammulla Gamage, Robert Sica, Alexander Haefele
Western Research Forum
Accurate measurements of relative humidity (RH) vertical profiles in the atmosphere is important for understanding the earth's weather and the climate system. RH represent the current state of the water vapor in the atmosphere with respect to the ambient air related to saturation. Even minor changes of the RH in the lower atmosphere has a large impact of the global circulation and cloud formation. Due to its high variability RH measurements in the lower atmosphere is significantly challenging. Raman lidar is one of the potential tools that can provide vertical profiles of RH. Typically, temperature and water vapor mixing ...
Emergent Critical Properties In LiquidGas Transition And Single Dislocations In Solid He4, Max Yarmolinsky
Emergent Critical Properties In LiquidGas Transition And Single Dislocations In Solid He4, Max Yarmolinsky
All Dissertations, Theses, and Capstone Projects
My research focuses on the analytical and numerical study of seemingly completely different systems  the classical critical point of the liquidgas transition and a quantum topological defect (dislocation) in solid Helium4. The unifying theme, though, is Emergence  the appearance of unexpected qualities at large distance and time scales in these systems. Our results resolve the long standing controversy about the nature of the liquidgas criticality by showing with high confidence that it is the same as that of Ising ferromagnet. In solid ^{4}He, a quantum superclimbing dislocation, which is expected to be violating spacetime symmetry according to the elementary ...
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 ...
PhotoTunable Compression And Realization Of Colloidal Spin Ice In Skyrmion Arrays In Chiral Nematic Liquid Crystals, Yuhan Wang
Undergraduate Honors Theses
Topological solitons are field configurations that are important to theorists in particle physics and cosmology, but recently have been studied in condensed matter systems with reconfigurable fields, like chiral magnets and liquid crystals. In these communities, there is a strong interest in studying and understanding the dynamic behavior of these solitons, many examples of which I will present in this thesis. This includes exploring the dynamic motion and patterning behavior of large numberdensities of twodimensional topological structures called skyrmions with external stimulation by light. With these techniques we can realize for the first time a colloidal spin ice system in ...
The Solvation Energy Of Ions In A Stockmayer Fluid, Cameron John Shock
The Solvation Energy Of Ions In A Stockmayer Fluid, Cameron John Shock
Dissertations, Master's Theses and Master's Reports
The solvation of ions in polar solvents has been a long studied system since the early twentieth century. A common technique to calculate the energy associated with ion solvation is the Born Solvation energy equation. This equation assumes an ion is placed in an incompressible, homogeneous dielectric, which is not necessarily representative of a real system. In this work the Stockmayer Fluid Model is used in a molecular dynamics simulation through the software LAMMPS to check the quantitative correctness of the Born equation. It is also shown how solvation energies of ions placed in polymerized and nonpolymerized solvents differ. It ...
Practical Chaos: Using Dynamical Systems To Encrypt Audio And Visual Data, Julia Ruiter
Practical Chaos: Using Dynamical Systems To Encrypt Audio And Visual Data, Julia Ruiter
Scripps Senior Theses
Although dynamical systems have a multitude of classical uses in physics and applied mathematics, new research in theoretical computer science shows that dynamical systems can also be used as a highly secure method of encrypting data. Properties of Lorenz and similar systems of equations yield chaotic outputs that are good at masking the underlying data both physically and mathematically. This paper aims to show how Lorenz systems may be used to encrypt text and image data, as well as provide a framework for how physical mechanisms may be built using these properties to transmit encrypted wave signals.
Universality Class Of Explosive Percolation In BarabásiAlbert Networks, Habib E. Islam, M. K. Hassan
Universality Class Of Explosive Percolation In BarabásiAlbert Networks, Habib E. Islam, M. K. Hassan
Physics Faculty Publications
In this work, we study explosive percolation (EP) in BarabásiAlbert (BA) network, in which nodes are born with degree k = m, for both product rule (PR) and sum rule (SR) of the Achlioptas process. For m = 1 we find that the critical point t_{c} = 1 which is the maximum possible value of the relative link density t; Hence we cannot have access to the other phase like percolation in one dimension. However, for m > 1 we find that t_{c} decreases with increasing m and the critical exponents ν, α, β and γ for m > 1 are found to ...
Matlab Programs
David D Nolte
Application Of Graphical Models In ProteinProtein Interactions And Dynamics, Amir Vajdi Hoojghan
Application Of Graphical Models In ProteinProtein Interactions And Dynamics, Amir Vajdi Hoojghan
Graduate Doctoral Dissertations
Every organism contains a few hundred to thousands of proteins. A protein is made of a sequence of molecular building blocks named amino acids. Amino acids will be referred to as residues. Every protein performs one or more functions in the cell. In order for a protein to do its job, it requires to bind properly to other partner proteins. Many genetic diseases such as cancer are caused by mutations (changes) of specific residues which cause disturbances in the functions of those proteins.
The problem of prediction of protein binding site is a crucial topic in computational biology. A protein ...
Fatigue Performance And Shear Demand Distributions Of Clustered Shear Connectors In Composite Bridge Girders, Brian David Hillhouse
Fatigue Performance And Shear Demand Distributions Of Clustered Shear Connectors In Composite Bridge Girders, Brian David Hillhouse
Theses and Dissertations
The current American Association of State Highway and Transportation Officials (AASHTO) Bridge Specifications assumes uniform shear flow demands at the steelconcrete interface of composite bridge girders. As stud pitch increases to beyond 24 in or as studs become clustered to account for precast concrete decks, this assumed shear demand distribution may be unrepresentative. Understanding shear transfer and resulting demands on headed studs in composite beams are important for ensuring adequate composite design. This study investigates stud demands in composite bridge girders using largescale fatigue testing and direct pressure measurements for stud force calculations. In this study, two largescale composite beam ...
Conforming Nanoparticle Sheets To Surfaces With Gaussian Curvature, Noah P. Mitchell, Remington L. Carey, Jelani Hannah, Yifan Wang, Sean P. Mcbride, XiaoMin Lin, Heinrich M. Jaeger
Conforming Nanoparticle Sheets To Surfaces With Gaussian Curvature, Noah P. Mitchell, Remington L. Carey, Jelani Hannah, Yifan Wang, Sean P. Mcbride, XiaoMin Lin, Heinrich M. Jaeger
Physics Faculty Research
Nanoparticle monolayer sheets are ultrathin inorganicorganic hybrid materials that combine highly controllable optical and electrical properties with mechanical exibility and remarkable strength. Like other thin sheets, their low bending rigidity allows them to easily roll into or conform to cylindrical geometries. Nanoparticle monolayers not only can bend, but also cope with strain through local particle rearrangement and plastic deformation. This means that, unlike thin sheets such as paper or graphene, nanoparticle sheets can much more easily conform to surfaces with com plex topography characterized by nonzero Gaussian curvature, like spherical caps or saddles. Here, we investigate the limits of nanoparticle ...
Magnetoelectric Memory Cells With DomainWallMediated Switching, Kirill Belashchenko, Oleg Tchernyshyov, Alexey Kovalev, Dmitri Nikonov
Magnetoelectric Memory Cells With DomainWallMediated Switching, Kirill Belashchenko, Oleg Tchernyshyov, Alexey Kovalev, Dmitri Nikonov
Kirill Belashchenko Publications
A magnetoelectric memory cell with domain  wall  mediated switching is implemented using a split gate architecture . The split gate architecture allows a domain wall to be trapped within a magnetoelectric antiferromagnetic ( MEAF ) active layer . An extension of this architecture applies to multiple gate linear arrays that can offer advantages in memory density , programmability , and logic functionality . Applying a small anisotropic in  plane shear strain to the MEAF can block domain wall precession to improve reliability and speed of switching
Reversible Motion In A Contact Line, Audrey Profeta, Esmeralda Orozco, Juan A. Ortiz Salazar, Dani Medina, Nathan C. Keim
Reversible Motion In A Contact Line, Audrey Profeta, Esmeralda Orozco, Juan A. Ortiz Salazar, Dani Medina, Nathan C. Keim
STAR (STEM Teacher and Researcher) Presentations
When a body of liquid sits on a surface, an irregular border between the wet and dry regions of the surface exists, called the contact line. Driving this contact line back and forth repeatedly can change its shape.We use a syringe pump to cyclically infuse and withdraw a predetermined volume of water, and take photos of the contact line after each cycle. Comparing these images to each other determines if the contact line is returning to the same shape. We find that below a critical value of infused volume, after many cycles the contact line reaches a steady state ...
A Network Theoretical Approach To RealWorld Problems: Application Of The KCore Algorithm To Various Systems, Kate BurlesonLesser
A Network Theoretical Approach To RealWorld Problems: Application Of The KCore Algorithm To Various Systems, Kate BurlesonLesser
All Dissertations, Theses, and Capstone Projects
The study of complex networks is, at its core, an exploration of the mechanisms that control the world in which we live at every scale, from particles no bigger than a grain of sand and amino acids that comprise proteins, to social networks, ecosystems, and even countries. Indeed, we find that, regardless of the physical size of the network's components, we may apply principles of complex network theory, thermodynamics, and statistical mechanics to not only better understand these specific networks, but to formulate theories which may be applied to problems on a more general level. This thesis explores several ...
VibratingWire Rheometry, Cameron C. Hopkins
VibratingWire Rheometry, Cameron C. Hopkins
Electronic Thesis and Dissertation Repository
This thesis consists of two projects on the behaviour of a novel vibratingwire rheometer and a third project studying the gelation dynamics of aqueous solutions of Pluronic F127. In the first study, we use COMSOL to perform twodimensional simulations of the oscillations of a wire in Newtonian and shearthinning fluids. Our results show that the resonant behaviour of the wire agrees well with the theory of a wire vibrating in Newtonian fluids. In shearthinning fluids, we find resonant behaviour similar to that in Newtonian fluids. In addition, we find that the shearrate and viscosity in the fluid vary significantly in ...
NonHermitian MatterWave Mixing In BoseEinstein Condensates: DissipationInduced Amplification, S. Wuster, Ramy ElGanainy
NonHermitian MatterWave Mixing In BoseEinstein Condensates: DissipationInduced Amplification, S. Wuster, Ramy ElGanainy
Ramy ElGanainy
We investigate the nonlinear scattering dynamics in interacting atomic BoseEinstein condensates under nonHermitian dissipative conditions. We show that, by carefully engineering a momentumdependent atomic loss profile, one can achieve matterwave amplification through fourwave mixing in a quasionedimensional nearlyfreespace setup—a process that is forbidden in the counterpart Hermitian systems due to energy mismatch. Additionally, we show that similar effects lead to rich nonlinear dynamics in higher dimensions. Finally, we propose a physical realization for selectively tailoring the momentumdependent atomic dissipation. Our strategy is based on a twostep process: (i) exciting atoms to narrow Rydberg or metastable excited states, and (ii ...
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 ...
Dynamics Of A Vertically Vibrated Doubly Tethered Granular Chain, Lorenzo P. Joquiño
Dynamics Of A Vertically Vibrated Doubly Tethered Granular Chain, Lorenzo P. Joquiño
The International Student Science Fair 2018
Polymer physics studies the structure and dynamics of polymers and polymeric systems. Results from polymer physics have been used in various fields such as biology, polymer processing, and electronics. Mechanical analogs like granular chain have been utilized in studying polymer dynamics as they are able to demonstrate coarsedgrained behavior of polymer motion while still being accurate about a polymer's properties at a larger length scale. In this study, vibrated granular chain of beads was used as an analog system to represent the polymer motion in a solution. The granular chain was confined to a circular container. Its both ends ...
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.
Numerical And Analytical Bounds On Threshold Error Rates For HypergraphProduct Codes, Alexey Kovalev, Sanjay Prabhakar, Ilya Dumer, Leonid P. Pryadko
Numerical And Analytical Bounds On Threshold Error Rates For HypergraphProduct Codes, Alexey Kovalev, Sanjay Prabhakar, Ilya Dumer, Leonid P. Pryadko
Faculty Publications, Department of Physics and Astronomy
We study analytically and numerically decoding properties of finiterate hypergraphproduct quantum low density paritycheck codes obtained from random (3,4)regular Gallager codes, with a simple model of independent X and Z errors. Several nontrivial lower and upper bounds for the decodable region are constructed analytically by analyzing the properties of the homological difference, equal minus the logarithm of the maximumlikelihood decoding probability for a given syndrome. Numerical results include an upper bound for the decodable region from specific heat calculations in associated Ising models and a minimumweight decoding threshold of approximately 7%.
Inference And Control In Regulatory Genomics, Siddharth Sharma
Inference And Control In Regulatory Genomics, Siddharth Sharma
Biology and Medicine Through Mathematics Conference
No abstract provided.
Lattice Scales From Gradient Flow And Chiral Analysis On The Milc Collaboration's Hisq Ensembles, Nathan Joseph Brown
Lattice Scales From Gradient Flow And Chiral Analysis On The Milc Collaboration's Hisq Ensembles, Nathan Joseph Brown
Arts & Sciences Electronic Theses and Dissertations
The interactions of quarks and gluons form most of the visible matter around us. Yet, extracting precise predictions from the field theory describing them, Quantum Chromodynamics (QCD), is notoriously difficult. By simulating the QCD interaction on a Euclidean space time lattice, the field theory can be regularized nonperturbatively and familiar statistical techniques from classical statistical mechanics can be applied. Then, by systematically improving each component of the process, high precision results can be obtained. Some of the possible components to be improved include the discretization of the continuum action, the determination of the lattice scale(s), the generation of gauge ...
Vibrational Relaxation Theory For Systems Embedded In Microscopically Specified Reservoirs, Anastasia Aemilia Ierides
Vibrational Relaxation Theory For Systems Embedded In Microscopically Specified Reservoirs, Anastasia Aemilia Ierides
Physics & Astronomy ETDs
This dissertation is a study of the theoretical framework of the practical as well as fundamental problem of the process of relaxation to equilibrium of quantum mechanical systems. The fundamental aspect is concerned with the simultaneous occurrence of decoherence and population equilibration. The practical aspect deals with experimental observations of vibrational relaxation of molecules embedded in liquids or solids. The systems include, but are not limited to, the nondegenerate dimer and harmonic oscillator, in one case weak and in the other strong, interaction with a thermal bath. The time dependence of the energy and the temperature dependence of the relaxation ...
Standard And Anomalous Wave Transport Inside Random Media, Xujun Ma
Standard And Anomalous Wave Transport Inside Random Media, Xujun Ma
All Dissertations, Theses, and Capstone Projects
This thesis is a study of wave transport inside random media using random matrix theory. Anderson localization plays a central role in wave transport in random media. As a consequence of destructive interference in multiple scattering, the wave function decays exponentially inside random systems. Anderson localization is a wave effect that applies to both classical waves and quantum waves. Random matrix theory has been successfully applied to study the statistical properties of transport and localization of waves. Particularly, the solution of the DorokhovMelloPereyraKumar (DMPK) equation gives the distribution of transmission.
For wave transport in standard one dimensional random systems in ...
Physical Applications Of The Geometric Minimum Action Method, George L. Poppe Jr.
Physical Applications Of The Geometric Minimum Action Method, George L. Poppe Jr.
All Dissertations, Theses, and Capstone Projects
This thesis extends the landscape of rare events problems solved on stochastic systems by means of the \textit{geometric minimum action method} (gMAM). These include partial differential equations (PDEs) such as the real GinzburgLandau equation (RGLE), the linear Schroedinger equation, along with various forms of the nonlinear Schroedinger equation (NLSE) including an application towards an ultrashort pulse modelocked laser system (MLL).
Additionally we develop analytical tools that can be used alongside numerics to validate those solutions. This includes the use of instanton methods in deriving state transitions for the linear Schroedinger equation and the cubic diffusive NLSE.
These analytical solutions ...