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Articles 1  30 of 229
FullText Articles in Physics
Mathematical Modelling Of Temperature Effects On The Afd Neuron Of Caenorhabditis Elegans, Zachary Mobille, Rosangela Follmann, Epaminondas Rosa
Mathematical Modelling Of Temperature Effects On The Afd Neuron Of Caenorhabditis Elegans, Zachary Mobille, Rosangela Follmann, Epaminondas Rosa
Annual Symposium on Biomathematics and Ecology Education and Research
No abstract provided.
An Accurate Solution Of The SelfSimilar OrbitAveraged FokkerPlanck Equation For CoreCollapsing Isotropic Globular Clusters: Properties And Application, Yuta Ito
Dissertations, Theses, and Capstone Projects
Hundreds of dense star clusters exist in almost all galaxies. Each cluster is composed of approximately ten thousand through ten million stars. The stars orbit in the clusters due to the clusters' selfgravity. Standard stellar dynamics expects that the clusters behave like collisionless selfgravitating systems on short time scales (~ million years) and the stars travel in smooth continuous orbits. Such clusters temporally settle to dynamically stable states or quasistationary states (QSS). Two fundamental QSS models are the isothermal and polytropic spheres since they have similar structures to the actual core (central part) and halo (outskirt) of the clusters. The two ...
Kinetics Of The CrystalMelt Phase Transformation In Semicrystalline Polymers, Kiran Subramaniam Iyer
Kinetics Of The CrystalMelt Phase Transformation In Semicrystalline Polymers, Kiran Subramaniam Iyer
Doctoral Dissertations
The assembly of longchain polymers into an ordered state is a process that has puzzled polymer scientists for several decades. A process that is largely controlled by the strength of intermolecular attractions in small molecular systems, this crystallization in the case of polymers is controlled by a competition between the aforementioned force of attraction between monomers and the formidable conformational entropy of polymer chains. Any factor that affects this conformational entropy, whether that is an equilibrium thermodynamic factor or a kinetic factor, has the ability to control polymer crystallization. In this thesis, we focus on understanding the underlying kinetic processes ...
Generalized Hydrodynamic Analysis Of Transport Through A Finite Open Nanopore For TwoComponent SingleFile Systems, King C. Lai, Tyler J. Pleasant, Andrés García, James W. Evans
Generalized Hydrodynamic Analysis Of Transport Through A Finite Open Nanopore For TwoComponent SingleFile Systems, King C. Lai, Tyler J. Pleasant, Andrés García, James W. Evans
Ames Laboratory Accepted Manuscripts
Singlefile diffusion (SFD) in finite open nanopores is characterized by nonzero spatially varying tracer diffusion coefficients within a generalized hydrodynamic description. This contrasts with infinite SFD systems where tracer diffusivity vanishes. In standard tracer counterpermeation (TCP) analysis, two reservoirs, each containing a different species, are connected to opposite ends of a finite pore. We implement an extended TCP analysis to allow the two reservoirs to contain slightly different mixtures of the two species. Then, determination of diffusion fluxes through the pore allows extraction of diffusion coefficients for nearconstant partial concentrations of the two species. This analysis is applied for a ...
Emergence, Mechanics, And Development: How Behavior And Geometry Underlie Cowrie Seashell Form, Michael G. Levy, Michael R. Deweese
Emergence, Mechanics, And Development: How Behavior And Geometry Underlie Cowrie Seashell Form, Michael G. Levy, Michael R. Deweese
Biology and Medicine Through Mathematics Conference
No abstract provided.
Physics 516: Electromagnetic Phenomena (Spring 2020), Philip C. Nelson
Physics 516: Electromagnetic Phenomena (Spring 2020), Philip C. Nelson
Department of Physics Papers
These course notes are made publicly available in the hope that they will be useful. All reports of errata will be gratefully received. I will also be glad to hear from anyone who reads them, whether or not you find errors: pcn@upenn.edu.
Target Control Of Networked Systems, Isaac S. Klickstein
Target Control Of Networked Systems, Isaac S. Klickstein
Mechanical Engineering ETDs
The control of complex networks is an emerging field yet it has already garnered interest from across the scientific disciplines, from robotics to sociology. It has quickly been noticed that many of the classical techniques from controls engineering, while applicable, are not as illuminating as they were for single systems of relatively small dimension. Instead, properties borrowed from graph theory provide equivalent but more practical conditions to guarantee controllability, reachability, observability, and other typical properties of interest to the controls engineer when dealing with large networked systems. This manuscript covers three topics investigated in detail by the author: (i) the ...
The Journey Of A Single Polymer Chain To A Nanopore, Navid Afrasiabian
The Journey Of A Single Polymer Chain To A Nanopore, Navid Afrasiabian
Electronic Thesis and Dissertation Repository
Single chain translocation has been eagerly studied for more than two decades due to its importance in biological processes and also, providing a better understanding of polymer dynamics. Polymer translocation can be divided into three stages of reaching the pore, entering the pore and passing through it. We study the delivery of the chain from the bulk to the entrance, which is called the capture process, for a single chain driven by hydrodynamic flow. Our molecular dynamicslattice Boltzmann simulations show that the converging flow around the nanopore not only facilitates the process of finding the pore but also deforms the ...
Extended Families Of Critical And Stationary Droplets For Nonequilibrium Phase Transitions In Spatially Discrete Bistable Systems, ChiJen Wang, DaJiang Liu, James W. Evans
Extended Families Of Critical And Stationary Droplets For Nonequilibrium Phase Transitions In Spatially Discrete Bistable Systems, ChiJen Wang, DaJiang Liu, James W. Evans
Ames Laboratory Accepted Manuscripts
Bistable nonequilibrium systems are realized in catalytic reactiondiffusion processes, biological transport and regulation, spatial epidemics, etc. Behavior in spatially continuous formulations, described at the meanfield level by reactiondiffusion type equations (RDEs), often mimics that of classic equilibrium van der Waals type systems. When accounting for noise, similarities include a discontinuous phase transition at some value, peq, of a control parameter, p, with metastability and hysteresis around peq. For each p, there is a unique critical droplet of the more stable phase embedded in the less stable or metastable phase which is stationary (neither shrinking nor growing), and with size diverging ...
Studying Resting State And Stimulus Induced Bold Activity Using The Generalized Ising Model And Independent Component Graph Analysis, Sivayini Kandeepan
Studying Resting State And Stimulus Induced Bold Activity Using The Generalized Ising Model And Independent Component Graph Analysis, Sivayini Kandeepan
Electronic Thesis and Dissertation Repository
Although many technical advancements have been made, neuroscientists still struggle to explain the underlying behaviour of how brain regions communicate with each other to form largescale functional networks. functional Magnetic Resonance Imaging (fMRI) has been commonly used to investigate changes between brain regions over time using the Blood Oxygen Level Dependent (BOLD) signal.
The goal of this thesis is to show the applicability of novel techniques and tools, such as the generalized Ising model (GIM) and the independent component graph analysis (GraphICA), to obtain information on the functional connectivity of populations with altered perception of consciousness. The GIM was used ...
Physical Models Of Living Systems 2nd Ed, New Chapter: Random Walks On An Energy Landscape, Philip C. Nelson
Physical Models Of Living Systems 2nd Ed, New Chapter: Random Walks On An Energy Landscape, Philip C. Nelson
Department of Physics Papers
This chapter extends the first edition of Physical Models of Living Systems (WH Freeman 2015). This preliminary version is made freely available asis in the hope that it will be useful.
The Origins Of Phantom Partials In The Piano, Lauren M. Neldner
The Origins Of Phantom Partials In The Piano, Lauren M. Neldner
Honors Program Theses
Phantom partials are anomalous frequency components identifiable in the sound of the piano and occur at the sum and difference frequencies of two overtones. For several decades they have been identified as crucial components to the sound of the piano and assumed to be generated by the forced longitudinal motion of the string. Recent work has identified that contrary to common belief, most of the power is produced in the nonstring components with the most likely source being the wooden structural components. This work presents experimental results for two plausible theories that could explain the origins of phantom partials in ...
Measuring And Modeling Information Flow On Social Networks, Tyson Charles Pond
Measuring And Modeling Information Flow On Social Networks, Tyson Charles Pond
Graduate College Dissertations and Theses
With the rise of social media, researchers have become increasingly interested in understanding how individuals inform, influence, and interact with others in their social network and how the network mediates the flow of information. Previous research on information flow has primarily used models of contagion to study the adoption of a technology, propagation of purchase recommendations, or virality of online activity. Social (or "complex") contagions spread differently than biological ("simple") contagions. A limitation when researchers validate contagion models is that they neglect much of the massive amounts of data now available through online social networks. Here we model a recently ...
Optical Potts Machine Through Networks Of ThreePhoton DownConversion Oscillators, Mostafa HonariLatifpour, MohammadAli Miri
Optical Potts Machine Through Networks Of ThreePhoton DownConversion Oscillators, Mostafa HonariLatifpour, MohammadAli Miri
Publications and Research
In recent years there has been a growing interest in optical simulation of lattice spin models for applications in classical computing. Here, we propose optical implementation of a threestate Potts spin model by using networks of coupled parametric oscillators with phase tristability. We first show that the cubic nonlinear process of spontaneous threephoton downconversion is accompanied by a tristability in the phase of the subharmonic signal between three states with 2��/3 phase contrast. The phase of such a parametric oscillator behaves like a threestate spin system. Next, we show that a network of dissipatively coupled threephoton downconversion oscillators emulates ...
Interpretations Of Bicoherence In Space & Lab Plasma Dynamics, Gregory Allen Riggs
Interpretations Of Bicoherence In Space & Lab Plasma Dynamics, Gregory Allen Riggs
Graduate Theses, Dissertations, and Problem Reports
The application of bicoherence analysis to plasma research, particularly in nonlinear, coupledwave regimes, has thus far been significantly belied by poor resolution in time, and/or outright destruction of frequency information. Though the typical power spectrum cloaks the phasecoherency between frequencies, Fourier transforms of higherorder convolutions provide an ndimensional spectrum which is adept at elucidating nwave phase coherence. As such, this investigation focuses on the utility of the normalized bispectrum for detection of wavewave coupling in general, with emphasis on distinct implications within the scope of nonlinear plasma physics. Interpretations of bicoherent features are given for time series ...
Dimension Reduction Techniques For High Dimensional And UltraHigh Dimensional Data, Subha Datta
Dimension Reduction Techniques For High Dimensional And UltraHigh Dimensional Data, Subha Datta
Dissertations
This dissertation introduces two statistical techniques to tackle highdimensional data, which is very commonplace nowadays. It consists of two topics which are interrelated by a common link, dimension reduction.
The first topic is a recently introduced classification technique, the weighted principal support vector machine (WPSVM), which is incorporated into a spatial point process framework. The WPSVM possesses an additional parameter, a weight parameter, besides the regularization parameter. Most statistical techniques, including WPSVM, have an inherent assumption of independence, which means the data points are not connected with each other in any manner. But spatial data violates this assumption. Correlation between ...
Effects Of Impurities On Calcium Oxalate Crystallization As Measured By Atomic Force Microscopy, Himasha Wijesekara
Effects Of Impurities On Calcium Oxalate Crystallization As Measured By Atomic Force Microscopy, Himasha Wijesekara
Electronic Thesis and Dissertation Repository
Calcium oxalate crystals are found in kidney stones as either calcium oxalate monohydrate (COM) or calcium oxalate dihydrate (COD). COM crystals are the most abundant form as they are thermodynamically more stable than COD crystals under physiological conditions. Certain aspartic acidrich molecules such as osteopontin (OPN) are known to affect stone formation by inhibiting COM and COD growth. We have studied COM {010} and COD {100} faces in the presence of OPN, polyaspartic acid (polyASP) and synthetic peptides derived from OPN to investigate the inhibitor mechanism.
We observed that polyASP preferentially inhibits one particular direction of {010} faces on COM ...
An Application Of The Ising Model, Juliano A. Everett
An Application Of The Ising Model, Juliano A. Everett
Publications and Research
Understanding how the Ising model works,what it represents, and how it can be applied to neurology. Given that an Ising model is an Entropy model that could be representative of the firing of neurons, some assumptions of the system are made and then the process is simulated through Monte Carlo methods.
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 ...
Characterization Of The Anomalous Ph Of Aqueous Nanoemulsions, Kieran P. Ramos
Characterization Of The Anomalous Ph Of Aqueous Nanoemulsions, Kieran P. Ramos
Doctoral Dissertations
Aqueous waterinoil nanoemulsions have emerged as a versatile tool for use in microfluidics, drug delivery, singlemolecule measurements, and other research. Nanoemulsions are often prepared with perfluorocarbons which are remarkably biocompatbile due to their stability, low surface tension, lipophobicity, and hydrophobicity. Therefore it is often assumed that droplet contents are unperturbed by the perfluorinated surface. However, in microemulsions, which are similar to nanoemulsions, it is known that either the pH of the aqueous phase or the ionization constants of encapsulated molecules are different from bulk solution. There is also recent evidence of low pH in perfluorinated aqueous nanoemulsions. The current underlying ...
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.
Inference Of Language Functional Network In Healthy, Cancerous And Bilingual Brains By Fmri And Network Modeling, Qiongge Li
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 ...
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
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.
Morphological Study Of Voids In UltraLarge Models Of Amorphous Silicon, Durga Prasad Paudel
Morphological Study Of Voids In UltraLarge Models Of Amorphous Silicon, Durga Prasad Paudel
Dissertations
The microstructure of voids in pure and hydrogenrich amorphous silicon (a:Si) network was studied in ultralarge models of amorphous silicon, using classical and quantum mechanical simulations, on the nanometer length scale. The nanostructure, particularly voids of device grade ultralarge models of a:Si was studied, in which observed threedimensional realistic voids were extended using geometrical approach within the experimental limit of voidvolume fractions. In devicegrade simulated models, the effect of void morphology; size, shape, number density, and distribution on simulated scattering intensities in small angle region were investigated. The evolution of voids on annealing below the crystallization temperature (≤ 800 ...
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 ...
Reactive And StimuliResponsive SulfoniumBased Polymer Zwitterions, Cristiam Santa Chalarca
Reactive And StimuliResponsive SulfoniumBased Polymer Zwitterions, Cristiam Santa Chalarca
Doctoral Dissertations
This dissertation describes the synthesis and characterization of novel monomers and (co)polymer zwitterions that incorporate trialkylsulfonium cations. The novel materials presented herein constitute a unique type of polymer zwitterions that exhibit salt and temperaturedependent water solubility as well as inherent reactivity. The behavior of these polymers in aqueous solutions, as nanostructures, and at liquidliquid interfaces was studied; in all cases, the inherent reactivity of the polymers was harnessed towards the fabrication of novel polymers and soft materials.
Following an introductory chapter, Chapter 2 describes the synthesis of sulfonium sulfonate monomers and polymer zwitterions. Both styrenic and methacrylic monomers were ...
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 ...
Calculating The Dimensionality Of The Brain, And Other Applications Of An Optimized Generalized Ising Model In Predicting Brain's Spontaneous Functions, Pubuditha M. Abeyasinghe
Calculating The Dimensionality Of The Brain, And Other Applications Of An Optimized Generalized Ising Model In Predicting Brain's Spontaneous Functions, Pubuditha M. Abeyasinghe
Electronic Thesis and Dissertation Repository
Understanding a system as complex as the human brain is a very demanding task. Directly working with structural and functional neuroimaging data has led to most of the understanding we have gained about the human brain. However, performing only the direct statistical comparisons on the empirical function and the structure does not fully explain the observed longrange functional correlations. Therefore, implementations of mathematical models to gain further understanding of the relationship between the structure and function of the brain is critical. Additionally, spontaneous functions of the brain can only be predicted using computer simulated models; which will be pivotal for ...
Characterization Of The Motion Of Cellulose Synthase Protein Complexes In The Plant Cell Membrane, Nina Zehfroosh
Characterization Of The Motion Of Cellulose Synthase Protein Complexes In The Plant Cell Membrane, Nina Zehfroosh
Doctoral Dissertations
The polysaccharide cellulose is the main component of plant cell walls, so it is the most abundant polymer on Earth. While it is widely used in industry due to its remarkable properties, such as renewability and biodegradability, its biosynthesis is still not well understood. The large transmembrane protein Cellulose Synthase Complex (CSC) is responsible for synthesizing cellulose by polymerizing UDP glucose into the constituent glucan chains of cellulose.
In this project, I used variable angle epifluorescence microscopy (VAEM) in combination with singleparticle tracking to characterize the motion of GFP labeled CSCs in the hypocotyl of Arabidopsis thaliana (A. thaliana) seedlings ...
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
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 ...