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Articles 1  30 of 5388
FullText Articles in Physical Sciences and Mathematics
Numerical Approximations Of Phase Field Equations With Physics Informed Neural Networks, Colby Wight
Numerical Approximations Of Phase Field Equations With Physics Informed Neural Networks, Colby Wight
All Graduate Plan B and other Reports
Designing numerical algorithms for solving partial differential equations (PDEs) is one of the major research branches in applied and computational mathematics. Recently there has been some seminal work on solving PDEs using the deep neural networks. In particular, the Physics Informed Neural Network (PINN) has been shown to be effective in solving some classical partial differential equations. However, we find that this method is not sufficient in solving all types of equations and falls short in solving phasefield equations. In this thesis, we propose various techniques that add to the power of these networks. Mainly, we propose to embrace the ...
"A Comparison Of Variable Selection Methods Using Bootstrap Samples From Environmental Metal Mixture Data", PaulYvann Djamen 4785403, PaulYvann Djamen
"A Comparison Of Variable Selection Methods Using Bootstrap Samples From Environmental Metal Mixture Data", PaulYvann Djamen 4785403, PaulYvann Djamen
Mathematics & Statistics ETDs
In this thesis, I studied a newly developed variable selection method SODA, and three customarily used variable selection methods: LASSO, Elastic net, and Random forest for environmental mixture data. The motivating datasets have neurodevelopmental status as responses and metal measurements and demographic variables as covariates. The challenges for variable selections include (1) many measured metal concentrations are highly correlated, (2) there are many possible ways of modeling interactions among the metals, (3) the relationships between the outcomes and explanatory variables are possibly nonlinear, (4) the signal to noise ratio in the real data may be low. To compare these methods ...
NonEquilibrium Growth Of Metal Clusters On A Layered Material: Cu On Mos2, Dapeng Jing, Ann LiiRosales, King C. Lai, Qiang Li, Jaeyoun Kim, Michael C. Tringides, James W. Evans, Patricia A. Thiel
NonEquilibrium Growth Of Metal Clusters On A Layered Material: Cu On Mos2, Dapeng Jing, Ann LiiRosales, King C. Lai, Qiang Li, Jaeyoun Kim, Michael C. Tringides, James W. Evans, Patricia A. Thiel
Chemistry Publications
We use a variety of experimental techniques to characterize Cu clusters on bulk MoS2 formed via physical vapor deposition of Cu in ultrahigh vacuum, at temperatures ranging from 300 K to 900 K. We find that large facetted clusters grow at elevated temperatures, using high Cu exposures. The cluster size distribution is bimodal, and under some conditions, large clusters are surrounded by a denuded zone. We propose that defectmediated nucleation, and coarsening during deposition, are both operative in this system. At 780 K, a surprising type of facetted cluster emerges, and at 900 K this type predominates: pyramidal clusters with ...
Modeling The Effects Of Fentanyl And Narcan On The Opioid Epidemic In Allegheny County Using Mathematics, Lindsay Moskal, Lauren Sines, Rachael Neilan Ph.D.
Modeling The Effects Of Fentanyl And Narcan On The Opioid Epidemic In Allegheny County Using Mathematics, Lindsay Moskal, Lauren Sines, Rachael Neilan Ph.D.
Undergraduate Research and Scholarship Symposium
Starting in the 1990s, physicians across the United States have increasingly prescribed opioid pain relievers, which has given rise to the current opioid epidemic. As a result, there has been a drastic increase in the number of overdose fatalities. In 2017, the number of opioid overdose deaths peaked and the U.S. declared the crisis as a public health emergency. One state that has contributed significantly to this epidemic is Pennsylvania, which ranks first for the greatest number of overdose deaths and third for the highest death rate. In fact, Allegheny County has witnessed an overdose death rate that is ...
Modeling The Effects Of Fentanyl And Narcan On The Opioid Epidemic In Allegheny County Using Mathematics, Lindsay Moskal, Lauren Sines, Rachael Neilan Ph.D.
Modeling The Effects Of Fentanyl And Narcan On The Opioid Epidemic In Allegheny County Using Mathematics, Lindsay Moskal, Lauren Sines, Rachael Neilan Ph.D.
Undergraduate Research and Scholarship Symposium
Starting in the 1990s, physicians across the United States have increasingly prescribed opioid pain relievers, which has given rise to the current opioid epidemic. As a result, there has been a drastic increase in the number of overdose fatalities. In 2017, the number of opioid overdose deaths peaked and the U.S. declared the crisis as a public health emergency. One state that has contributed significantly to this epidemic is Pennsylvania, which ranks first for the greatest number of overdose deaths and third for the highest death rate. In fact, Allegheny County has witnessed an overdose death rate that is ...
The Boundary Element Method For Parabolic Equation And Its Implementation In Bem++, Sihao Wang
The Boundary Element Method For Parabolic Equation And Its Implementation In Bem++, Sihao Wang
Mathematics Theses and Dissertations
The goal of this work is to develop a fast method for solving Galerkin discretizations of boundary integral formulations of the heat equation. The main contribution of this work is to devise a new fast algorithm for evaluating the dense matrices of the discretized integral equations.
Similar to the parabolic FMM, this method is based on a subdivision of the matrices into an appropriate hierarchical block structure. However, instead of an expansion of the kernel in both space and time we interpolate kernel in the temporal variables and use of the adaptive cross approximation (ACA) in the spatial variables.
The ...
Spreading Mechanics And Differentiation Of Astrocytes During Retinal Development, Tracy Stepien, Timothy W. Secomb
Spreading Mechanics And Differentiation Of Astrocytes During Retinal Development, Tracy Stepien, Timothy W. Secomb
Biology and Medicine Through Mathematics Conference
No abstract provided.
The Role Of Diversity Amplification For Personal Protection Control Strategies In VectorBorne Disease Models, Jeffery Demers, Sharon Bewick, Justin M. Calabrese, William F. Fagan
The Role Of Diversity Amplification For Personal Protection Control Strategies In VectorBorne Disease Models, Jeffery Demers, Sharon Bewick, Justin M. Calabrese, William F. Fagan
Biology and Medicine Through Mathematics Conference
No abstract provided.
DensityDependent Development Impacts The Success Of WolbachiaBased Mosquito Control Programs, Alyssa Petroski, Lauren M. Childs, Michael Andrew Robert
DensityDependent Development Impacts The Success Of WolbachiaBased Mosquito Control Programs, Alyssa Petroski, Lauren M. Childs, Michael Andrew Robert
Biology and Medicine Through Mathematics Conference
No abstract provided.
AttractionRepulsion Taxis Mechanisms In A PredatorPrey Model, Evan C. Haskell
AttractionRepulsion Taxis Mechanisms In A PredatorPrey Model, Evan C. Haskell
Biology and Medicine Through Mathematics Conference
No abstract provided.
ParallelInTime Simulation Of Biofluids, Weifan Liu, Minghao Rostami
ParallelInTime Simulation Of Biofluids, Weifan Liu, Minghao Rostami
Biology and Medicine Through Mathematics Conference
No abstract provided.
A ModelBased Investigation Of The Role Of Density Dependence In Juvenile Mosquito Development And Survival, Melody Walker Ms, Lauren M. Childs, Michael A. Robert
A ModelBased Investigation Of The Role Of Density Dependence In Juvenile Mosquito Development And Survival, Melody Walker Ms, Lauren M. Childs, Michael A. Robert
Biology and Medicine Through Mathematics Conference
No abstract provided.
Mathematical Modeling Of Gliding Motility And Its Regulation In Myxococcus Xanthus, Yirui Chen
Mathematical Modeling Of Gliding Motility And Its Regulation In Myxococcus Xanthus, Yirui Chen
Biology and Medicine Through Mathematics Conference
No abstract provided.
A Mathematical Framework To Augment Metrics Of Small Intestinal Health, Cara J. Sulyok, Judy Day, Suzanne Lenhart
A Mathematical Framework To Augment Metrics Of Small Intestinal Health, Cara J. Sulyok, Judy Day, Suzanne Lenhart
Biology and Medicine Through Mathematics Conference
No abstract provided.
EcoEvolutionary Dynamics Of Microbial Communities, Lihong Zhao
EcoEvolutionary Dynamics Of Microbial Communities, Lihong Zhao
Biology and Medicine Through Mathematics Conference
No abstract provided.
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.
Mathematical Modeling Of The Car TCell Therapy, Emek Kose, Elizabeth Zollinger, Samantha Elliott
Mathematical Modeling Of The Car TCell Therapy, Emek Kose, Elizabeth Zollinger, Samantha Elliott
Biology and Medicine Through Mathematics Conference
No abstract provided.
Tympanal Asymmetry In A Parasitoid Fly: Small Asymmetries Produce Big Gains, Max MikelStites, Anne E. Staples
Tympanal Asymmetry In A Parasitoid Fly: Small Asymmetries Produce Big Gains, Max MikelStites, Anne E. Staples
Biology and Medicine Through Mathematics Conference
No abstract provided.
A Mathematical Model To Study The Crime Dynamics Spread Within Minority Communities, Maila BrucalHallare, Beatriz Cuartas, Anne Fernando, Ana VivasBarber
A Mathematical Model To Study The Crime Dynamics Spread Within Minority Communities, Maila BrucalHallare, Beatriz Cuartas, Anne Fernando, Ana VivasBarber
Biology and Medicine Through Mathematics Conference
No abstract provided.
Parameter Estimation For Tear Film Thinning, Rayanne Luke
Parameter Estimation For Tear Film Thinning, Rayanne Luke
Biology and Medicine Through Mathematics Conference
No abstract provided.
The Role Of Variation In Mate Choice And Wolbachia Infection On Aedes Aegypti Population Dynamics, Bernardo Ameneyro
The Role Of Variation In Mate Choice And Wolbachia Infection On Aedes Aegypti Population Dynamics, Bernardo Ameneyro
Biology and Medicine Through Mathematics Conference
No abstract provided.
Using Network Modeling To Understand The Relationship Between SarsCov1 And SarsCov2, Elizabeth Brooke Haywood, Nicole A. Bruce
Using Network Modeling To Understand The Relationship Between SarsCov1 And SarsCov2, Elizabeth Brooke Haywood, Nicole A. Bruce
Biology and Medicine Through Mathematics Conference
No abstract provided.
Exploring The Effect Of The Nestling Recruitment Curve On Enzootic West Nile Virus Transmission, Emily B. Horton
Exploring The Effect Of The Nestling Recruitment Curve On Enzootic West Nile Virus Transmission, Emily B. Horton
Biology and Medicine Through Mathematics Conference
No abstract provided.
Decision Tree For Predicting The Party Of Legislators, Afsana Mimi
Decision Tree For Predicting The Party Of Legislators, Afsana Mimi
Publications and Research
The motivation of the project is to identify the legislators who voted frequently against their party in terms of their roll call votes using Office of Clerk U.S. House of Representatives Data Sets collected in 2018 and 2019. We construct a model to predict the parties of legislators based on their votes. The method we used is Decision Tree from Data Mining. Python was used to collect raw data from internet, SAS was used to clean data, and all other calculations and graphical presentations are performed using the R software.
Hadamard WellPosedness For Two Nonlinear Structure Acoustic Models, Andrew Becklin
Hadamard WellPosedness For Two Nonlinear Structure Acoustic Models, Andrew Becklin
Dissertations, Theses, and Student Research Papers in Mathematics
This dissertation focuses on the Hadamard wellposedness of two nonlinear structure acoustic models, each consisting of a semilinear wave equation defined on a smooth bounded domain $\Omega\subset\mathbb{R}^3$ strongly coupled with a Berger plate equation acting only on a flat portion of the boundary of $\Omega$. In each case, the PDE is of the following form: \begin{align*} \begin{cases} u_{tt}\Delta u +g_1(u_t)=f(u) &\text{ in } \Omega \times (0,T),\\[1mm] w_{tt}+\Delta^2w+g_2(w_t)+u_t_{\Gamma}=h(w)&\text{ in }\Gamma\times(0,T),\\[1mm] u=0&\text{ on ...
Hydrodynamic Instability Simulations Using FrontTracking With HigherOrder Splitting Methods, Dillon Trinh
Hydrodynamic Instability Simulations Using FrontTracking With HigherOrder Splitting Methods, Dillon Trinh
Mathematical Sciences Undergraduate Honors Theses
The RayleighTaylor Instability (RTI) is an instability that occurs at the interface of a lighter density fluid pushing onto a higher density fluid in constant or timedependent accelerations. The RichtmyerMeshkov Instability (RMI) occurs when two fluids of different densities are separated by a perturbed interface that is accelerated impulsively, usually by a shock wave. When the shock wave is applied, the less dense fluid will penetrate the denser fluid, forming a characteristic bubble feature in the displacement of the fluid. The displacement will initially obey a linear growth model, but as time progresses, a nonlinear model is required. Numerical studies ...
NonLinear Modifications Of BlackScholes Pricing Model With Diminishing Marginal Transaction Cost, Kaidi Wang
NonLinear Modifications Of BlackScholes Pricing Model With Diminishing Marginal Transaction Cost, Kaidi Wang
Undergraduate Honors Theses
In the field of quantitative financial analysis, the BlackScholes Model has exerted significant influence on the booming of options trading strategies. Publishing in their Nobel Prize Work in 1973, the model was generated by Black and Scholes. Using Ito’s Lemma and portfolio management methodology, they employed partial differential equation to provide a theoretical estimate of the price of Europeanstyle options.
This paper is interested in deriving nonlinear modifications of the BlackScholes model with diminishing marginal transaction cost.
Stochastic Modeling Of Zoonotic Disease, Sausan Odatalla
Stochastic Modeling Of Zoonotic Disease, Sausan Odatalla
Theses, Dissertations and Culminating Projects
We provide an overview of the mathematical modeling of deterministic and stochastic infectious disease models. These models enable one to understand the outbreak, spread, and extinction of disease. We then focus on stochastic models with a disease reservoir to understand outbreak vulnerability for zoonotic diseases such as Ebola Virus Disease (EVD). Numerical results from a more complicated EVD model are compared with the theoretical results of a simplified stochastic SISk model. We also demonstrate the effect that vaccine has on outbreak vulnerability in a population that is connected to a disease reservoir.
StageStructured Blue Crab Population Model With Fishing, Predation And Cannibalism, Fangming Xu
StageStructured Blue Crab Population Model With Fishing, Predation And Cannibalism, Fangming Xu
Undergraduate Honors Theses
Blue crab is a species of crab commonly found in the waters of the western Atlantic Ocean. It is one of the most important shellfish in the Chesapeake Bay. The blue crab fishing industry has a notable impact on the local economy, and blue crabs form a key link in the Chesapeake Bay food web. Between the mid1990s and 2004, the blue crab population dropped by two thirds. Factors such as habitat loss, harvest pressure and climate change may have contributed to the decline. However, there hasn’t been enough research on the long term dynamic equilibrium, making it difficult ...
Dynamics Of Sensory Integration Of Olfactory And Mechanical Stimuli Within The Response Patterns Of Moth Antennal Lobe Neurons, Harrison Tuckman
Dynamics Of Sensory Integration Of Olfactory And Mechanical Stimuli Within The Response Patterns Of Moth Antennal Lobe Neurons, Harrison Tuckman
Undergraduate Honors Theses
Odors emanating from a biologically relevant source are rapidly embedded within a windy, turbulent medium that folds and spins filaments into fragmented strands of varying sizes. Environmental odor plumes therefore exhibit complex spatiotemporal dynamics, and rarely yield an easily discernible concentration gradient marking an unambiguous trail to an odor source. Thus, sensory integration of chemical input, encoding odor identity or concentration, and mechanosensory input, encoding wind speed, is a critical task that animals face in resolving the complex dynamics of odor plumes and tracking an odor source. In insects, who employ olfactory navigation as their primary means of foraging for ...