Honors Projects
Showing 131 - 140 of 662 Items
Properties of Slicing Conditions for Charged Black Holes
Date: 2023-01-01
Creator: Sean E. Li
Access: Open access
- We consider an earlier analysis by Baumgarte and de Oliveira (2022) of static Bona-Massó slices of stationary, nonrotating, uncharged black holes, represented by Schwarzschild spacetimes, and generalize that approach to Reissner-Nordström (RN) spacetimes, representing stationary, nonrotating black holes that carry a nonzero charge. This charge is parametrized by the charge-to-mass ratio λ ≡ Q/M, where M is the black-hole mass and the charge Q may represent electrical charge or act as a placeholder for extensions of general relativity. We use a height-function approach to construct time-independent, spherically symmetric slices that satisfy a so-called Bona-Massó slicing condition. We compute quantities such as critical points and profiles of geometric quantities for several different versions of the Bona-Massó slicing condition. In some cases we do this analytically, while in others we use numerical root-finding to solve quartic equations. We conclude that in the extremal limit as λ → 1, all slices that we consider approach a unique slice that is independent of the chosen Bona-Massó condition. We then study dynamical, i.e. time-dependent, Bona-Massó slices by analytically predicting the qualitative behavior of the central lapse, i.e. the lapse at the black-hole puncture, for a particular slice that Alcubierre (1997) proposed to mitigate gauge shocks. These shock-avoiding slices are a viable alternative to the very common so-called 1 + log slices but exhibit different behavior in dynamical simulations. We use a perturbation of the radial coordinate at the location of the puncture to recover approximately harmonic late-time oscillations of the central lapse that Baumgarte and Hilditch (2022) observed in numerical simulations.

Structural and methodological factors influencing the sorption of alkylpyridiniums to aluminosilicates Access to this record is restricted to members of the Bowdoin community. Log in here to view.
Date: 2023-01-01
Creator: Seamus Frey
Access: Access restricted to the Bowdoin Community

The Influence of Polymers on the Solubility of Flufenamic Acid and Mefenamic Acid Cocrystals This record is embargoed.
- Embargo End Date: 2027-05-16
Date: 2024-01-01
Creator: Morgan Adams
Access: Embargoed
The French Official Mistress: Fashioning Female Political Power in the Ancien Régime
Date: 2024-01-01
Creator: Samantha Brown
Access: Open access
- This thesis focuses on the French official mistress as a position of unofficial female political power under the French monarchy from the 16th to the 18th century. Centering on three case studies – Diane de Poitiers, Madame de Maintenon, and Madame de Pompadour – this thesis argues that the role of the official mistress extended beyond sexual companion to advisor, negotiator, diplomat, artistic patron, and cultural trendsetter. By taking a deep look at the epistolary and artistic record of these three official mistresses from across France’s modern history, the extent of their autonomy and political maneuvering becomes clear in the tactics they used to project and solidify their power. Diane de Poitiers, Madame de Maintenon, and Madame de Pompadour all existed in unique contexts of the French court and constructed their own methods of fulfilling the role of the official mistress, revealing both changes in the monarchy and their impacts upon it. Notably, the ways in which they projected identity through self-fashioning resulted in a reflection of this image back onto the monarch, expanding the extent of their impact on the monarchy. In striving to understand the political reality of women in France under Salic law and today, the position of maîtresse-en-titre is a crucial framework to recognize the significance of female power structures at court and in the monarchy, and the degree to which women were able to shape these structures themselves.

Examining the Effect of Aromatic Substituents in Peptoid Catalysts of Stereoselective Trifluoromethylation Access to this record is restricted to members of the Bowdoin community. Log in here to view.
Date: 2024-01-01
Creator: Daniel Chi
Access: Access restricted to the Bowdoin Community

The Evangelical Ethic and the Spirit of Conspiracy Access to this record is restricted to members of the Bowdoin community. Log in here to view.
Date: 2023-01-01
Creator: Jackson David Lakowsky Hansen
Access: Access restricted to the Bowdoin Community
Una Comprensione Computazionale della Psiche Emotiva e Ordine nelle Ballate del Decameron: Stilometria e Elaborazione del Linguaggio Naturale
Date: 2023-01-01
Creator: Nothando Khumalo
Access: Open access
- The present thesis, written in Italian, explores the emotional psyche and narrative order embedded within the ballads of the Decameron, a renowned literary masterpiece by Giovanni Boccaccio. Leveraging the advancements in stylometry and natural language processing techniques, this research aims to convince medieval Italian literature scholars to produce more on scholarship of the ballads and uncover the intricate patterns of human emotions and narrative organization in the ballads. The study begins by establishing a comprehensive corpus of ballads from the Decameron, utilizing digital libraries and text repositories. Subsequently, using stylometric analysis, the research examines the linguistic and stylistic features that distinguish the brigata’s ballads, focusing on elements such as vocabulary, syntax, and rhyme scheme. These analyses enable the identification of authorial patterns, shedding light on the emotional expressions and narrative techniques employed by Boccaccio. A natural language processing model was used to predict authorship of the ballads using each of the brigata’s novelle as training data. The findings of this research contribute to a deeper understanding of the emotional and narrative purpose of the Decameron's ballads. Results of stylometric analysis allowed for new characterization of Panfilo’s ballad as sad and revealed how similarity in the emotional psyches of the brigata transcends gender. These novel perspectives allowed for unique literary analysis of the ballads. Accurate prediction of ballad authorship demonstrates that ballads fit into the narrative structure of the Decameron and restore order in each of the ten days.

Design, Fabrication, and Evaluation of Surface Acoustic Wave Resonators on ST-X Quartz Access to this record is restricted to members of the Bowdoin community. Log in here to view.
Date: 2023-01-01
Creator: Angela McKenzie
Access: Access restricted to the Bowdoin Community

Development of a Schiff base Synthetic Platform for 8-phenyliminonaphthol Photoacids Access to this record is restricted to members of the Bowdoin community. Log in here to view.
Date: 2023-01-01
Creator: Ibrahim G. Saleh
Access: Access restricted to the Bowdoin Community
Synthesis of N-Heterocyclic Carbene Complexes of Coinage Metals and Their Application in the Activation of Hydrogen
Date: 2024-01-01
Creator: Maryam Akramova
Access: Open access
- The main cause of the ongoing global climate crisis is the emission of greenhouse gases, and current climate reports emphasize the need to transition to low-emission renewable energy sources. Urgently needed are methods for storing renewable energy, such as synthetic fuels like hydrogen (H2) gas; however, a challenge to the widespread implementation of hydrogen fuel is its low volumetric energy density. This thesis describes an effort to synthesize a catalyst that takes advantage of hard-soft acid-base (HSAB) mismatches to activate H2 and facilitate its reaction with CO2 to form hydrocarbon fuels, thereby providing a sustainable means of storing renewable energy in high-density carbon-neutral fuels. The catalyst design features an exceptionally bulky N-heterocyclic carbene (NHC) ligand known as IPr** (3-Bis[2,6-bis[bis(4-tert-butylphenyl)methyl]-4-methylphenyl]-1H-imidazol-3-ium chloride), a coinage metal acting as a soft acid, and a hard base such as an alkoxide ion. Herein is reported a modified synthetic route of IPr**, along with its metalation with silver, and preliminary results of the addition of an alkoxide base. The ligand and its complex with silver are structurally characterized by nuclear magnetic resonance (NMR) spectroscopy. Further work is needed to complete the characterization of IPr**-supported HSAB mismatch complexes and investigate their potential to activate H2.