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Articles 1  10 of 10
FullText Articles in Computational Engineering
Simulating Optical Processes In NextGeneration Photovoltaics, Devin Michael Rourke
Simulating Optical Processes In NextGeneration Photovoltaics, Devin Michael Rourke
Electrical, Computer & Energy Engineering Graduate Theses & Dissertations
An increased need for cheap renewable energy has led to active research in solar technologies with improved efficiency and decreased production cost. Nextgeneration photovoltaic technologies, which utilize novel materials, processing techniques, and architectures, can improve light absorption and photocurrent generation. Experimental device development suffers from slow troubleshooting timescales, making device simulation a powerful tool for exploration of an everincreasing parameter space. In this report, we develop and apply a finite element combined optical and electrical device model, which predicts the optoelectronic performance of photovoltaic devices. The model is applied to two systems: the nearinfrared absorption enhancement of bulk heterojunction organic ...
Dynamics Of Crowded And Active Biological Systems, Michael W. Stefferson
Dynamics Of Crowded And Active Biological Systems, Michael W. Stefferson
Physics Graduate Theses & Dissertations
Interactions between particles and their environment can alter the dynamics of biological systems. In crowded media like the cell, interactions with obstacles can introduce anomalous subdiffusion. Active matter systems, e.g., bacterial swarms, are nonequilibrium fluids where interparticle interactions and activity cause collective motion and dynamical phases. In this thesis, I discuss my advances in the fields of crowded media and active matter. For crowded media, I studied the effects of soft obstacles and bound mobility on tracer diffusion using a lattice Monte Carlo model. I characterized how bound motion can minimize the effects of hindered anomalous diffusion and obstacle ...
Beyond The Standard Model With Composite Particles: A Lattice Study Based On Su(4), William I. Jay
Beyond The Standard Model With Composite Particles: A Lattice Study Based On Su(4), William I. Jay
Physics Graduate Theses & Dissertations
This thesis is about numerical simulations of a strongly coupled quantum field theory. The quantum field theory is a gauge theory based on the group SU(4) and contains fermionic matter charged under two different representations of the gauge group. The motivation for studying this theory is twofold. First, this theory is closely related to a theory of physics beyond the Standard Model which was recently proposed in the literature. In this model, the Higgs boson is a composite particle, and the top quark is a partially composite particle. Second, theories of this sort represent a new direction in the ...
SpaceTime Extended Finite Element Method With Applications To FluidStructure Interaction Problems, Toshiki Nagai
SpaceTime Extended Finite Element Method With Applications To FluidStructure Interaction Problems, Toshiki Nagai
Aerospace Engineering Sciences Graduate Theses & Dissertations
This thesis presents a spacetime extended finite element method (spacetime XFEM)
based on the Heaviside enrichment for transient problems with moving interfaces, and its applications to the fluidstructure interaction (FSI) analysis. The Heavisideenriched XFEM is a promising method to discretize partial differential equations with discontinuities in space. However, significant approximation errors are introduced by time stepping schemes when the interface geometry changes in time. The proposed spacetime XFEM applies the finite element discretization and the Heaviside enrichment in both space and time with elements forming a spacetime slab. A simple spacetime scheme is introduced to integrate the weak form of ...
Numerical Coupling Of Fracture And Fluid Pressure Using A PhaseField Model With Applications In Geomechanics, David B. Culp
Numerical Coupling Of Fracture And Fluid Pressure Using A PhaseField Model With Applications In Geomechanics, David B. Culp
Civil Engineering Graduate Theses & Dissertations
The application of fracture mechanics is an increasingly important topic in fields including geophysics, geomechanics, materials engineering, structural mechanics and engineering design. The initiation and evolution of fractures in porous media often gives rise to discontinuous fields within computational problems. We compute the crack's aperture, or crack opening, by making use of the gradient of the phasefield in the damaged area. This is useful for determining the material's fluidmechanical properties, such as the estimation of Poiseuilletype flow that occurs within a sufficiently damaged medium. Using this approach, it can be shown that the evolution of such fractures in ...
Unentangling Quantum Algorithms For Mathematicians And Engineers, Jaden K. Pieper
Unentangling Quantum Algorithms For Mathematicians And Engineers, Jaden K. Pieper
Applied Mathematics Graduate Theses & Dissertations
As industry continues to inspire considerable growth in the research and development of quantum computers, it is increasingly worthwhile to familiarize oneself with the computational theory of this new and exciting field.
In this manuscript, we introduce readers to quantum computing by first developing a quantum intuition through the enlightening results of the socalled SternGerlach experiment. After getting a feeling for quantum physics concepts such as superposition and measurement, and the need of linear algebra and probability to describe quantum phenomena, we move to a discussion of quantum computing. We develop a "quantum toolbox,'' the mathematical tools used to explore ...
The Collaborative Learning Framework: Scaffolding For Untrained PeerToPeer Collaboration, Brittany Ann Kos
The Collaborative Learning Framework: Scaffolding For Untrained PeerToPeer Collaboration, Brittany Ann Kos
ATLAS Institute Graduate Contributions
Recently, we've seen huge enrollment increases in computing and technology courses, which make it difficult for instructors to work personally with students and give them individualized instruction. Instructors may encourage students to work together, but we cannot assume that students know how to ask for assistance from their peers or that students will know how to provide meaningful educational support. Our motivation for this study was to create a computer science educational intervention that provided students with a scaffolded framework that helps them work through problems together. Our goal was to create a simple and quickly understood resource for ...
The Unique Hackathon Experience, Brittany Ann Kos
The Unique Hackathon Experience, Brittany Ann Kos
ATLAS Institute Graduate Contributions
In this paper, we give insight into the growing student hackathon movement. Student hackathons are weekend events where students come together to create, build, and share projects of any kind. These events are typically software and hardware focused, but have been expanding to broader disciplines. These events give students opportunities to learn and experience computing in ways that are not seen in a typical computer science classroom.
Out study collected data from 7,800 students participating in over 300 student hackathons, hosted from 20132016. We describe the particular model of student hackathon this data was collected from. Our analysis focuses ...
Improving The Efficiency And Quality Of OmegaRegular Synthesis, Saqib Sohail
Improving The Efficiency And Quality Of OmegaRegular Synthesis, Saqib Sohail
Electrical, Computer & Energy Engineering Graduate Theses & Dissertations
The automatic synthesis of a program from its specification has been an ambitious goal since Alonzo Church asked in 1962 if given a Monadic Second Order (MSO) formula as a logical specification of reactive system with inputs I and outputs O then is it possible to decide where there exists a reactive system that satisfies the specification; and if the specification is realizabile then a reactive system should be generated as a proof. Buechi and Landwaber proved in 1969 that solving the automatic synthesis problem is decidable. While in 1989 Pnueli and Rosner described an automatic synthesis procedure with the ...
Computational Imaging Using Electromagnetic Optics, Anurag Satish Agrawal
Computational Imaging Using Electromagnetic Optics, Anurag Satish Agrawal
Electrical Engineering Graduate Theses & Dissertations
Modern optical imaging systems make extensive use of computational power for analog preprocessing, analog to digital conversion and digital postprocessing. The joint design of these elements can be used to optimize the information throughput of optical imaging systems. This paradigm, termed computational optical imaging, aims at optimizing the output of optical systems in the form of imaging metrics, multidimensional imaging, feature detection, compressive sensing, etc. However, most optical imaging systems rely on the scalar wave theory of light to analyze these modern systems. Light, being an electromagnetic wave is vectorial in nature leading to significant errors in the scalar model ...