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College of Saint Benedict and Saint John's University

2018

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Articles 1 - 14 of 14

Full-Text Articles in Physical Sciences and Mathematics

Transient Transmission Oscillations In Doped And Undoped Lithium Niobate Induced By Near-Infrared Femtosecond Pulses, Bryan J. Crossman, Gregory J. Taft Dec 2018

Transient Transmission Oscillations In Doped And Undoped Lithium Niobate Induced By Near-Infrared Femtosecond Pulses, Bryan J. Crossman, Gregory J. Taft

Physics Faculty Publications

Transient transmission oscillations in X-cut and Z-cut congruent, iron-doped, and magnesium-doped lithium niobate samples were measured using 50 fs, 800 nm, 0.5 nJ pulses from a self-mode-locked Ti:sapphire laser in an optical pump–probe system. Several Raman-active oscillation modes excited by these pulses were observed as changes in the transmitted probe intensity versus time delay between the pump and probe pulses. The samples were rotated to determine how the incident polarization of the pump pulses affects the mode excitations. The observed Raman-active oscillations correspond to previously reported symmetry modes measured with traditional, continuous-wave, Raman spectroscopy using the same scattering …

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Ai-Human Collaboration Via Eeg, Adam Noack May 2018

Ai-Human Collaboration Via Eeg, Adam Noack

All College Thesis Program, 2016-2019

As AI becomes ever more competent and integrated into our lives, the issue of AI-human goal misalignment looms larger. This is partially because there is often a rift between what humans explicitly command and what they actually mean. Most contemporary AI systems cannot bridge this gap. In this study we attempted to reconcile the goals of human and machine by using EEG signals from a human to help a simulated agent complete a task.

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Seeing An Exoplanet, Leo Moraczewski Apr 2018

Seeing An Exoplanet, Leo Moraczewski

Celebrating Scholarship and Creativity Day (2018-)

In my experiment, I used the telescopes at the Saint John’s Observatory to measure the brightness of three stars that were expected to have exoplanets orbiting them. I was unable to take enough data on two of the stars, but was able to confirm the existence of an exoplanet around the third, HD189733.

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Modeling Solitary Waves In The Earth’S Magnetosphere, Jessica Thwaites Apr 2018

Modeling Solitary Waves In The Earth’S Magnetosphere, Jessica Thwaites

Celebrating Scholarship and Creativity Day (2018-)

Solitary waves occur in many mediums, both on Earth and in space. These waves are a single isolated wavelength or half wavelength of a full wave. This research focuses on observing these waves at the Earth’s magnetopause, the region around Earth where the Earth’s magnetic field controls the motion of particles. This research applies a Gaussian function to model solitary waves in Mathematica, utilizing electric potential data gathered by NASA’s Polar spacecraft. The code is able to loop through the data set, finding fit parameters for the function for each wave. It can also loop through the entirety of our …

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Ring Opening Polymerization, Zoua Pa Vang Apr 2018

Ring Opening Polymerization, Zoua Pa Vang

Celebrating Scholarship and Creativity Day (2018-)

The goal of the research discussed in this paper is to demonstrate that N-heterocyclic carbenes can be bonded to a transition metal center resulting in a complex that is able to effectively catalyze the ring opening polymerization of caprolactone. While N-Heterocyclic carbene ligands have been documented as effective catalysts for the ring opening polymerization (ROP) of lactones and lactides, less is known about the catalytic abilities of these ligands when bound to a labile metal center. This article focuses on examining the synthesis and reactivity of different transition metal complexes containing tin, zinc, aluminium and titanium metal centers. In addition …

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Farnsworth-Hirsch Fusor, Michael Nelson Apr 2018

Farnsworth-Hirsch Fusor, Michael Nelson

Celebrating Scholarship and Creativity Day (2018-)

We built a Farnsworth-Hirsch fusor in order to study neutron emission from nuclear fusion. Its construction involved a mechanical roughing pump, an oil diffusion pump, a vacuum chamber, a high negative-polarity power source, and a bubble dosimeter neutron detector. To determine the efficiency of the fusor we look at the neutron emission flux and the power input. We then compare those results to obtain a ratio of power input versus the power output by the fusor.

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Synthesis And Characterization Of A Model Multi-Copper Oxidase, Joshua Gavin Apr 2018

Synthesis And Characterization Of A Model Multi-Copper Oxidase, Joshua Gavin

Celebrating Scholarship and Creativity Day (2018-)

Multi-copper oxidases possess an unusual triangular copper complex; ceruloplasmin is an example. Ceruloplasmin oxidizes iron from the ferrous state to the ferric state, assisting in iron transport. This oxidn. is coupled with the redn. of dioxygen to water, the mechanism of which is unclear. In order to elucidate more the mechanism of redn., this study focuses on the synthesis and characterization of a novel copper (I) complex with a new tapma-based ligand. This tapma ligand is modeled after the tris (2-pyridylmethyl) amine-based (tpma) ligand family where nitrogen based donors are employed. This tapma ligand is synthesized from 1,3,5-tris(azidomethyl)-2,4,6-triethylbenzene in a …

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Dynamic Reflectivity And Transmissivity Measurements Of Black Phosphorus Flakes, Matthew Stiller Apr 2018

Dynamic Reflectivity And Transmissivity Measurements Of Black Phosphorus Flakes, Matthew Stiller

Celebrating Scholarship and Creativity Day (2018-)

We studied the dynamic reflectivity and transmissivity of black phosphorus flakes using a pump/probe laser system. The flakes were excited with femtosecond laser pulses, ~60fs, in order to observe how the optical constants changed with respect to time delay. The relaxation time period of the excited charge carriers was calculated to be ~200-300fs during transmission measurements. Reflectivity measurements had shown longer time periods but could not be calculated due to limitations of the experimental setup. Future improvements to the system’s temporal range will be able to provide more detailed information about the longer lifetimes.

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Marginalized Populations And Climate Change, Olayemi Fadahunsi Apr 2018

Marginalized Populations And Climate Change, Olayemi Fadahunsi

Sociology Student Work

This study investigates the impact of climate change on marginalized populations , and seeks to understand the strategies of climate activists from so-called Least Developed Countries, particularly small island nations, for influencing climate policy on the global stage. I conducted participant observation and interviews at the UNFCCC’s COP 21 in Paris, in order to understand how marginalized populations anticipate the future, solutions they have to mitigate the harmful effects of climate change, and how they saw themselves being represented at the conference.

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Sigma Gamma Epsilon Student Research Poster Session, Geological Society Of America Meeting 2017, Seattle, Washington, Usa, Paula Even Apr 2018

Sigma Gamma Epsilon Student Research Poster Session, Geological Society Of America Meeting 2017, Seattle, Washington, Usa, Paula Even

The Compass: Earth Science Journal of Sigma Gamma Epsilon

The Sigma Gamma Epsilon, an academic honor society for students of the Earth Sciences, is an important tradition at GSA annual meetings. Sigma Gamma Epsilon's goal in sponsoring this session is to provide a student-friendly forum for young researchers to present on undergraduate research; this session has seen increasing interest and participation over the years. The session is open to students (regardless of membership in Sigma Gamma Epsilon) and faculty co-authors working in any area of the geosciences. Those posters authored by student members in good standing of active chapters of Sigma Gamma Epsilon will be judged for two (2) …

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Sigma Gamma Epsilon - News And Information, Tyler Kee, Erin P. Argyilan, James Berglund Apr 2018

Sigma Gamma Epsilon - News And Information, Tyler Kee, Erin P. Argyilan, James Berglund

The Compass: Earth Science Journal of Sigma Gamma Epsilon

No abstract provided.

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The Algorithmic Composition Of Classical Music Through Data Mining, Tom Donald Richmond, Imad Rahal Apr 2018

The Algorithmic Composition Of Classical Music Through Data Mining, Tom Donald Richmond, Imad Rahal

All College Thesis Program, 2016-2019

The desire to teach a computer how to algorithmically compose music has been a topic in the world of computer science since the 1950’s, with roots of computer-less algorithmic composition dating back to Mozart himself. One limitation of algorithmically composing music has been the difficulty of eliminating the human intervention required to achieve a musically homogeneous composition. We attempt to remedy this issue by teaching a computer how the rules of composition differ between the six distinct eras of classical music by having it examine a dataset of musical scores, rather than explicitly telling the computer the formal rules of …

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Making Scientific Applications Portable: Software Containers And Package Managers, Curtis Noecker Apr 2018

Making Scientific Applications Portable: Software Containers And Package Managers, Curtis Noecker

All College Thesis Program, 2016-2019

Scientific workflows for high-performance computing (HPC) are becoming increasingly complex. Developing a way to simplify these workflows could save many hours for both HPC users and developers, potentially eliminating any time spent managing software dependencies and experiment set-up. To accomplish this, we propose using two programs together: Docker and Spack. Docker is a container platform and Spack is a package manager designed specifically for HPC. In this paper, we show how Docker and Spack can be used to containerize the extreme-scale Scientific Software Development Kit (xSDK). Doing this makes the xSDK far more accessible to non-computer scientists and lowers time …

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This Will Change Everything: Teaching The Climate Crisis, John Foran, Summer Gray, Corrie Grosse, Theo Lequesne Jan 2018

This Will Change Everything: Teaching The Climate Crisis, John Foran, Summer Gray, Corrie Grosse, Theo Lequesne

Environmental Studies Faculty Publications

We argue that U.S. sociologists have been woefully remiss in incorporating the climate crisis into our research agendas and even more, into our teaching. After laying out the gravity of the situation we issue a call for sociologists to consider whether they wish to continue this striking denial of responsibility to our students and to knowledge production. We then present four ways that we have infused our understanding of climate change, climate crisis, and climate justice into courses on global issues, social movements, inequality, and much more. We believe that “climate justice” – the key concept that drives our concern …

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