Open Access. Powered by Scholars. Published by Universities.®

Computational Engineering Commons

Open Access. Powered by Scholars. Published by Universities.®

University of Colorado, Boulder

Discipline
Keyword
Publication Year
Publication
Publication Type

Articles 1 - 10 of 10

Full-Text Articles in Computational Engineering

Simulating Optical Processes In Next-Generation Photovoltaics, Devin Michael Rourke Apr 2018

Simulating Optical Processes In Next-Generation 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. Next-generation 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 ever-increasing 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 near-infrared absorption enhancement of bulk heterojunction organic ...


Dynamics Of Crowded And Active Biological Systems, Michael W. Stefferson Jan 2018

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 Jan 2018

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 ...


Space-Time Extended Finite Element Method With Applications To Fluid-Structure Interaction Problems, Toshiki Nagai Jan 2018

Space-Time Extended Finite Element Method With Applications To Fluid-Structure Interaction Problems, Toshiki Nagai

Aerospace Engineering Sciences Graduate Theses & Dissertations

This thesis presents a space-time extended finite element method (space-time XFEM)

based on the Heaviside enrichment for transient problems with moving interfaces, and its applications to the fluid-structure interaction (FSI) analysis. The Heaviside-enriched 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 space-time XFEM applies the finite element discretization and the Heaviside enrichment in both space and time with elements forming a space-time slab. A simple space-time scheme is introduced to integrate the weak form of ...


Numerical Coupling Of Fracture And Fluid Pressure Using A Phase-Field Model With Applications In Geomechanics, David B. Culp Jan 2018

Numerical Coupling Of Fracture And Fluid Pressure Using A Phase-Field 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 phase-field in the damaged area. This is useful for determining the material's fluid-mechanical properties, such as the estimation of Poiseuille-type 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 Jan 2017

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 so-called Stern-Gerlach 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 Peer-To-Peer Collaboration, Brittany Ann Kos Jan 2017

The Collaborative Learning Framework: Scaffolding For Untrained Peer-To-Peer 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 Jan 2016

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 2013-2016. We describe the particular model of student hackathon this data was collected from. Our analysis focuses ...


Improving The Efficiency And Quality Of Omega-Regular Synthesis, Saqib Sohail Apr 2014

Improving The Efficiency And Quality Of Omega-Regular 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 Jan 2014

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 pre-processing, analog to digital conversion and digital post-processing. 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 ...