Honors Projects

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Miniature of DS-PSO: Particle Swarm Optimization with Dynamic and Static Topologies
DS-PSO: Particle Swarm Optimization with Dynamic and Static Topologies

Date: 2017-05-01

Creator: Dominick Sanchez

Access: Open access

Particle Swarm Optimization (PSO) is often used for optimization problems due to its speed and relative simplicity. Unfortunately, like many optimization algorithms, PSO may potentially converge too early on local optima. Using multiple neighborhoods alleviates this problem to a certain extent, although premature convergence is still a concern. Using dynamic topologies, as opposed to static neighborhoods, can encourage exploration of the search space at the cost of exploitation. We propose a new version of PSO, Dynamic-Static PSO (DS-PSO) that assigns multiple neighborhoods to each particle. By using both dynamic and static topologies, DS-PSO encourages exploration, while also exploiting existing knowledge about the search space. While DS-PSO does not outperform other PSO variants on all benchmark functions we tested, its performance on several functions is substantially better than other variants.
Miniature of Functional redundancy of a non-native foundation species (eelgrass, <i>Zostera japonica</i>) across intertidal stress gradients
Functional redundancy of a non-native foundation species (eelgrass, Zostera japonica) across intertidal stress gradients

Date: 2023-01-01

Creator: S. Maria Garcia

Access: Open access

Non-native species foundation species can alter ecosystems in both positive and negative ways. The creation of habitat can be beneficial to native species when they provide a limiting resource or in a stressful environment. Yet this creation of habitat can also be detrimental by replacing native species and/or facilitating the presence of more non-native species. In Willapa Bay, WA, a non-native foundation species, Zostera japonica, co-exists with the native foundation species Zostera marina. Zostera japonica persists at the higher intertidal in monocultures, the two species overlap in the mid intertidal, and Z. marina persists in monocultures in the low intertidal. Epifaunal invertebrates, the organisms that live on eelgrass blades, connect eelgrass to higher trophic levels. Through a series of transplants and removals, I used this zonation pattern to ask if the two species can fulfill a similar functional role in respect to epifaunal invertebrates (functional redundancy), and if this was due to the identity of the foundation species or a response to the stress gradient of the intertidal. My results suggest that the epifaunal invertebrate community is responding more to the physiological stress gradient, and the functional redundancy of the two species depends on the location they are found. Z. japonica is expanding the range of vegetated habitat into to the physiologically stressful high zone, which supports a different community. This experiment highlights that the impacts of non- native species are highly localized and that abiotic and biotic factors are important to trophic interactions.
Miniature of A Practical Study in Conducting Renaissance and Contemporary Choral Music During the COVID-19 Pandemic
A Practical Study in Conducting Renaissance and Contemporary Choral Music During the COVID-19 Pandemic
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      Date: 2021-01-01

      Creator: Emily M. Ha

      Access: Access restricted to the Bowdoin Community

        Miniature of The Politics of Land Rights in the Transition to Democratic South Africa: The Rise and Fall of the Constitutional Property Clause
        The Politics of Land Rights in the Transition to Democratic South Africa: The Rise and Fall of the Constitutional Property Clause

        Date: 2019-05-01

        Creator: Anna Louisa Roosevelt Lennon

        Access: Open access

        Miniature of Personally Relevant Indoor Nature Imagery’s Impact on Students’ Well-Being, Connection to Nature, and Eco-Conscious Behaviors
        Personally Relevant Indoor Nature Imagery’s Impact on Students’ Well-Being, Connection to Nature, and Eco-Conscious Behaviors

        Date: 2019-05-01

        Creator: Sarena Sabine

        Access: Open access

        Previous research has shown that experiences in nature are predictive of increased connection to nature, well-being, and pro-environmental behavior. The current study investigated whether daily exposure to indoor nature imagery would also improve well-being and eco-conscious behaviors, and whether personally relevant images would enhance this hypothesized effect. Participants completed a test assessing baseline connection to nature and well-being, specifically satisfaction with life, positive and negative emotions, and stress. In the 2 (Nature vs. Built) X 2 (Familiar vs. Unfamiliar) study design, 125 participants either received a poster from a photo that they submitted (a personally-relevant nature scene or personally-relevant built scene) or a poster of an unfamiliar natural or built scene. After four weeks of daily exposure to this new poster in their home, participants completed a post-test which included the same measures of well-being and connection to nature, along with a novel eco-conscious behaviors measure involving environmental petitions. The nature intervention significantly improved participants’ satisfaction with life. The personal relevancy of images did not enhance well-being, either alone nor in interaction with image content. The finding that daily exposure could lead to improved well-being has implications for addressing mental health concerns.
        Miniature of "We are your wives, sisters, daughters, mothers and friends:" United States' Women's Stories from the Public to the Archive
        "We are your wives, sisters, daughters, mothers and friends:" United States' Women's Stories from the Public to the Archive
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            Date: 2019-01-01

            Creator: Sadie LoGerfo-Olsen

            Access: Access restricted to the Bowdoin Community

              Miniature of Urban Modernity and Turbulent Water: Toward a Transnational History of Expansion in Northern Japan, 1866-1882
              Urban Modernity and Turbulent Water: Toward a Transnational History of Expansion in Northern Japan, 1866-1882
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                  Date: 2018-05-01

                  Creator: Ethan Barkalow

                  Access: Access restricted to the Bowdoin Community

                    Miniature of N,N’-Dimethyimidazolium-2-Carboxylate as a Ligand Precursor for the Accession of a Constrained Olefin Dimerization Catalyst
                    N,N’-Dimethyimidazolium-2-Carboxylate as a Ligand Precursor for the Accession of a Constrained Olefin Dimerization Catalyst

                    Date: 2020-01-01

                    Creator: Michael Harris

                    Access: Open access

                    A significant market share of modern plastics is held by long-chain hydrocarbon polymers, such as polyethylene and polypropylene, properties of which can be dramatically changed by addition of linear α-olefins. Production of linear α-olefins involves the creation of many unwanted byproducts, representing significant quantities of both economic and ecological waste. While catalysts have been designed to selectively produce industrially useful olefins, these catalysts often encounter challenges such as synthesis of other unwanted byproducts, slow reaction times, and difficulty of synthesis. Based on one such prior catalyst, we report here synthetic work towards a cobalt catalyst with a constrained N-heterocyclic carbene supporting ligand predicted to allow for more favorable product distributions. Synthesis of two precursors to a sterically unhindered N-heterocyclic carbene, as well as development of a synthetic protocol for the coordination of N,N’- dimethylimidazolium-2-carboxylate to Cp*Co(ethene)2 was completed. Activation of the precatalyst and preliminary catalytic experiments were performed, though abbreviated research periods made complete analysis impossible. Finally, we report evidence of the formation of a novel cobalt-NHC dimer as a temperature controlled byproduct of the desired catalyst synthesis.
                    Miniature of “One of Folly’s Failures”: <i>Plessy v. Ferguson</i> (1896) and the Decline of the Thirteenth Amendment
                    “One of Folly’s Failures”: Plessy v. Ferguson (1896) and the Decline of the Thirteenth Amendment
                    This record is embargoed.
                      • Embargo End Date: 2025-05-14

                      Date: 2020-01-01

                      Creator: Grace Ann Fenwick

                      Access: Embargoed

                        Miniature of Mechanisms underlying variable responses to the neuropeptide C-type allatostatin (AST-C) across isoforms and among individuals in the American lobster, <i>Homarus americanus</i>
                        Mechanisms underlying variable responses to the neuropeptide C-type allatostatin (AST-C) across isoforms and among individuals in the American lobster, Homarus americanus

                        Date: 2020-01-01

                        Creator: Audrey J. Muscato

                        Access: Open access

                        Central pattern generators (CPGs) produce patterned outputs independent of sensory input. The cardiac neuromuscular system of the American lobster (Homarus americanus) is driven by a CPG called the cardiac ganglion (CG), which is composed of nine neurons, making it a model system of study. Modulation of CPGs allows for functional flexibility. One neuropeptide family that modulates the CG is C-type allatostatin (AST-C I-III). Previous research has shown variation in the responses of the CG across the three isoforms and among individuals. First, we investigated why AST-C I and III elicit responses that are more similar to each other than they are to the responses elicited by AST-C II. We hypothesized that an amino acid difference in the conserved sequence was responsible for the observed variation in responses. We synthesized isoforms of AST-C that replaced the endogenous amino acid and recorded responses to these isoforms. The identity of one particular amino acid in the conserved sequence seems to be responsible for variations in responses in frequency. Next, we focused on variation among individuals in their responses to AST-C I and III. We hypothesized that the mechanism behind this individual variation is differential expression of AST-C receptors and/or their downstream targets. We recorded physiological responses of the cardiac system to AST-C and then sequenced CG RNA from the same lobsters. Differential expression of one of the AST-C receptors and a number of downstream factors is correlated with physiological response. These findings inspire further experimentation investigating molt cycle as the underlying cause.
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                        Biochemistry Neuroscience and Neurobiology Molecular and Cellular Neuroscience Arts and Humanities Biology American Politics Life Sciences Marine Biology Molecular Biology Comparative Politics Genetics Homarus americanus Social and Cultural Anthropology Artificial Intelligence and Robotics International Relations Plant Biology Political History United States History Creative Writing Fiction Cell Biology Feminist, Gender, and Sexuality Studies Gulf of Maine Social and Behavioral Sciences Systems Neuroscience Arabidopsis Behavioral Neurobiology Bioinformatics Molecular Genetics Cellular and Molecular Physiology Climate English Language and Literature Physical Chemistry Political Theory cardiac ganglion Analytical Chemistry Behavioral Economics Ecology and Evolutionary Biology Environmental Chemistry Genetics and Genomics Maine Organic Chemistry Physical Sciences and Mathematics central pattern generator Asian American Studies Cultural History European History Finance Gender and Sexuality Helicobacter pylori Inorganic Chemistry Machine Learning Nonfiction Oceanography Place and Environment Political Science Race, Ethnicity, and Post-Colonial Studies Social History Theory and Algorithms United States Urban Studies and Planning gender identity lobster neuromodulation Asian History Biogeochemistry Candida albicans Chemistry Cognitive Psychology Development Developmental Biology Developmental Neuroscience Drosophila Ethnic Studies Film and Media Studies Literature in English, North America, Ethnic and Cultural Minority Ordinary Differential Equations and Applied Dynamics Other Neuroscience and Neurobiology Poetry Public Policy Race and Ethnicity African Studies Applied Mathematics Cognitive Neuroscience Community-Based Research Cosmology, Relativity, and Gravity Dynamic Systems Econometrics Educational Sociology Geochemistry Geology Gryllus bimaculatus History Inequality and Stratification Laboratory and Basic Science Research Latin American 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and Public Administration Quantitative, Qualitative, Comparative, and Historical Methodologies Religion Social Justice Sociology of Culture Terrestrial and Aquatic Ecology WAK Zostera marina anxiety central pattern generators education eelgrass feminism locomotion maternal separation modulation numerical relativity parvalbumin photosynthesis politics race religion stories zebrafish ATAC-seq Adhesion American Art and Architecture American Popular Culture Artificial Intelligence British Isles Civic and Community Engagement Comparative and Evolutionary Physiology Composition Computer Sciences Condensed Matter Physics Continental Philosophy Criminal Procedure DFT Defense and Security Studies Diplomatic History Dramatic Literature, Criticism and Theory EEG Economic History Economic Policy Economics Education Education Policy El Salvador Elections Environmental Monitoring Environmental Studies Ethics Excited State Proton Transfer French and Francophone Literature Fresh Water Studies German Language and Literature H. pylori Hydrology Immunology and Infectious Disease Italy Japan Jewish Studies Kent Island Latina/o Studies Law Lesbian, Gay, Bisexual, and Transgender Studies Linguistic Anthropology Locomotion Medicine and Health Medieval Studies Metaphysics Microbiology Military History Minimization Modern Art and Architecture Nationalism Near and Middle Eastern Studies Neoliberalism Neuropeptide New York City Numerical Analysis and Computation Other Feminist, Gender, and Sexuality Studies Other Film and Media Studies Other Physics Parvalbumin Peptoids Photocatalysis Physiology Public Affairs Public Economics Public Health RNA-binding protein Regional Sociology Rousseau Russia Saccharomyces cerevisiae Sociology of Religion Spain Systems and Integrative Physiology Theatre and Performance Studies Theory and Criticism Toll Urban Studies Urban, Community, and Regional Planning algorithms bacteria behavior bioinformatics black holes cardiac diaspora electrophysiology enhancers eyes absent greenwashing immigration lipopolysaccharide literature morality myosuppressin narrative nation neuromuscular junction oral history parenting pectin phenotypic plasticity plasticizer prefrontal cortex queer representation sex differences stomatogastric nervous system whiteness women 8-amino-2-naphthol AMPs Abortion African American Studies African National Congress Africana Studies Agriculture Aluminosilicates American Literature American Studies Analysis Ancient History, Greek and Roman through Late Antiquity Architectural History and Criticism Arctic Art Asian American literature Asian Studies Asterias forbesi Astrophysics and Astronomy Attention Bacteria Bacterial Infections and Mycoses Basins of Attraction Behavior Behavior and Ethology Biblical Studies Biodiversity Cancer borealis Caribbean Languages and Societies Catalysis Catholicism Cell Wall Central Pattern Generator Central pattern generators Child Psychology Chile Christian Denominations and Sects Chromatin Civil Rights and Discrimination Classical Literature and Philology Climate Change Clinical Psychology Clustering Cold War Compensatory plasticity Computational Biology Computational Chemistry Counterinsurgency Cricket Criminal Law Critical and Cultural Studies Cuba Curriculum and Social Inquiry DNA methylation Dance Democracy Development Studies Developmental Psychology Disability Studies Drosophila melanogaster EJP ESPT Early Life Adversity Educational Methods Eelgrass Election Law Empowerment Enhancers Entomology Environmental Health Environmental Law Epistemology Ethnomusicology Experimental Analysis of Behavior Family Family, Life Course, and Society Fgf Folklore Food Studies Forest Biology GIS Genomics Geometry and Topology Geomorphology Germany Glaciology Harmonic Analysis and Representation Harpswell Sound Health Economics Heterocyclic Amines Higher Education History of Christianity Holocaust and Genocide Studies Honduras Human Rights Law IOR Identity Immigration Law Imperialism 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Political Science Other Psychology PRE Particle Swarm Optimization Personality and Social Contexts Philosophy of Science Photoacid Physical and Environmental Geography Plant Breeding and Genetics Plant Pathology Plasticity Polarization Policy History, Theory, and Methods Political Economy Politics Posthumanism Protestantism Queer Queer Theory RNA transport ROG1 Race, Ethnicity and Post-Colonial Studies Reading and Language Remote Sensing Renaissance Renaissance Studies Rural Sociology SED SGRN Segregation Sensitivity Analysis Sexuality She3 Short Stories Signaling Social Control, Law, Crime, and Deviance Social Movements Social Psychology Social Statistics Social Welfare Social and Philosophical Foundations of Education Soil Sorption South Africa Soviet Union Soviet and Post-Soviet Studies Spaetzle Sri Lanka Statistics and Probability Surrealism Sustainability Swarm Intelligence Syria Tectonics and Structure Theatre History Tocqueville Toll receptors Tradition Transcription Tributyl phosphate (TBP) Turkey Twitter U.S. Congress Visual Studies Volcanology WAKs Whiteness accessibility adhesion aesthetics antibiotics art authoritarianism autoethnography bioacoustics bioorthogonal chemistry cardiac muscle cardiac neuromuscular system censorship chemical biology chromatin climate cold-deactivation community community ecology cosmology crab creative writing culture decision-making depression disability drosophila ecology enhancer episodic memory estrogen evolution extraction eya family feedback fiction fictive locomotion filamentation game theory glycan glycans glycoprotein glycosylation government herbivore horizon hydrogen activation in situ hybridization intersectionality ion channels journalism ketamine labor machine learning maternal health mathematics memoir memorialization metabolic oligosaccharide engineering migration motor neuron neuromodulator neuropeptide neuropeptides neutron star nitric oxide odontogenesis organic oxygen oxygen isotopes paleoceanography phosphorylation photoacids photography plasticity poetry policy political psychology postcolonial literature president prison promoter punishment receptors remote sensing salinity short stories short story signaling social reproduction sociology steroid stigma stretch stretch feedback terrorism thermal tolerance total viewshed translation transnational trifluoromethylation video games viewshed virtual reality visibility water (U-Th)/He 1-level density 1850s 1930s 1951 Refugee Convention 1967 National Language Act 19th century literature 2-naphthol 2-picolinic acid 2-picolylamine 2022 midterm elections 20th century literature 2666 5-mC 5-methylcytosine A-type potassium current A. islandica AGN AGO AI AMD ATAC-Seq AVGSEFLamide Abnormal Psychology Abolition Above-ground biomass Above-ground woody increment (AGWI) Absurdity Acadia Acoustic Acoustics, Dynamics, and Controls Active Active Force Activity testing Adaptation Additives Administrative Law Adolescence Adolescent Adoptee Adrienne Monnier Affect Studies Affordable Housing Afghanistan Africa African African Languages and Societies African descended Colombians Afro-Colombians Afterload Agent Based Modeling Aging Agricultural and Resource Economics Aid Aid Allocation Akaroa Volcanic Complex Alaska Albert Camus Alexander Alexandrian Judaism Algebra Algeria Algerian Literature Algerian War Ali Smith Alkylpyridines Alleghanian Orogeny Amalgamated Cooperative Amazon American Art American Culture American History American Medical Association American Religion American lobster American lobster (Homarus americanus) Amidation Analytic continuation Ancient, Medieval, Renaissance and Baroque Art and Architecture Aniline Aniline Blue Animal Structures Anita Hill Anthropogenic Warming Anthropological Linguistics and Sociolinguistics Anthropological Methodology Anthropomorphism in AI Antillanité Antisemitism Antitrust Aoraki/Mount Cook Aotearoa New Zealand Apatite Apiculture Appalachian Mountains Appalachians Apple Applied Ethics Approximation Theory Aquaculture Aquaculture and Fisheries Arab Arab Spring Arab-American Arabic Studies Arceuthobium Pusillum Archaeological Anthropology Architecture Aristocracy Arm Regeneration Art Practice Art and Design Arthur Rimbaud Ascending Neurons Asclepias syriaca Ash1 Ashcan School Asian America Asian American Asian American affect Asian Art Astrangia poculata Athens Atmospheric Sciences Atomic Atwood Auditory Auditory System Austrian Literature Authenticity Autonomy Azide B fragilis B. fragilis BDNF Backtest Overfitting Bacterial monosaccharides Bacteriology Bacteroides fragilis Baffin Island Bangalore Baroreceptor Bashar al-Assad Basins of Attrac- tion Basque Country Bats Baudrillard Bayesian reasoning Bayesian statistics Bayside Bayside Trail Beauvoir Berlin Beta-blockers BiOCl Big Tech Bioactivity directed approach Biochemistry, Biophysics, and Structural Biology Biological Naturalism Biological Psychology Biological fitness Biomechanics Biomedicalization Bioorthogonal Chemistry Biophysical Interaction Biopolitics Biostatistics Bismuth oxychloride Black Black Panther Party Blame Allocation Blending Block Holder Blockholder Bobby Murray Boccaccio Bombay Bona-Masso Bondi accretion Bootstrap Boreal Bowdoin Bradysia coprophila Brett Kavanaugh Britain British Informal Empire Broadway Brownian motion Brutalism Bubble Buenos Aires Bureaucratic Politics Burkina Faso Business Buwei Yang By Night in Chile C-Type Allatostatin C-type allatostatin C. jejuni C. maenas CEQ CNS CO2 capture COMSOL Multiphysics COVID-19 CPGs Calcification Calcium dynamics Calvinism Camp Theory Campaign Finance Campaign ads Camus Canada Canadian History Candidiasis Canon formation Canvassing Capital Punishment Capitalism Carassius auratus Carbon dioxide Carceral Carcinus maenus Cardiac Ganglion Cardiac Output Cardiac muscle cell Care Career Choice Caribbean Caribbean cinema Carl von Clausewitz Carolyn Chute Cartels Casco Bay Caspian Gates Catalonia Cathodoluminescence Catholic Catholic Studies Cation Exchange Cationic Amines Cell Adhesion Cell Elongation & Growth Celtic Studies Central America Central American Studies Central High School; Little Rock; Orval Faubus; 1957; Brown v. Board of Education; Racism; Civil Rights Movement; Southern; Virgil Blossom; The Mothers League; desegregation Central Nervous System Central Pattern Generators Central Pattern Generators (CPGs) Central pattern generator Change Chaos-Monde Charity Charles Taylor Chemicals and Drugs Chess Chester Himes Chevron Chicana/o Studies Childhood Narratives Children's and Young Adult Literature Chinatown Chinese Diaspora Fiction Chinese Exclusion Act Chinese Immigration Chinese Room Argument Chinese Studies Chinese-American identity Chisholm v. The Board of Education Chlorophyll fluorescence Choir Choral Conducting Choreopoem Christian Christine Blasey Ford Chromosome Dynamics Cinema Studies Citizenship Civil Law Civil Procedure Clarence Thomas Classical Classics Click chemistry Climate migrants Coalitions Cobalt Catalyst Cobalt Hydroxide Carbonate Cocrystals Solubility Cold Stress Colin Powell Collective Land Titles Colonial India Colonialism. German Colonialism Colorado Colorado beetle Comic Studies Communication Communication Technology and New Media Communism Community Engagement Community Psychology Community-Based Learning Comparative Methodologies and Theories Comparative and Historical Linguistics Compensatory Compensatory Plasticity Complex Interdependence Computational Finance Computational Game Theory Computational game theory Computer Vision Concave Concentrated Poverty Concept Detection Condensin II Conducting Conducting Music Conducting Technique Conflict Conflict Negotiation Confucianism Congress Congressional Conifer Conifers Conscientious Objectors Conservation Conspiracy Constitutional Law Constitutional Tools Contemporary Contemporary Art Context specificity Conversion Therapy Cooperation Cooperative Housing Coral Reefs Corporate Control Corporate Governance Costa Rica Courts Covering Spaces Covid-19 Crassostrea virginica Criminology Critical Habitat Cross-Validation Crustacean Crustose Coralline Algae Crypto-Jews Crystallization Créolité Cultural Memory Cultural Preservation Current Support Theorem Cyberdeterrence Cyclic Voltammetry D1R agonist DDR DMC DNA repair DRG DSM Danaus plexippus Danio rerio Dante Data Mining Data Protection Data Science Databases and Information Systems David Foster Wallace Deafferentation Death Decameron Decision Deep Ecology Deep Learning DeepLabCut Degeneration Democracy Promotion Democratic Alliance Demography Demography, Population, and Ecology Dendrite Dendritic sprouting Density Functional Theory