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Articles 1 - 8 of 8
Full-Text Articles in Physical Sciences and Mathematics
Intramolecular Chemistry Of Ss-Acetoxyethylidene And Photochemical Generation Of Vinylidenes, Jennifer M. Nguyen
Intramolecular Chemistry Of Ss-Acetoxyethylidene And Photochemical Generation Of Vinylidenes, Jennifer M. Nguyen
Honors Theses
The parent carbene ß-acetoxyethylidene has been previously generated by the photolysis of its precursor, acetic acid 1a,9b-dihydro-1H-cyclopropa[l]phenanthren-1-yl methyl ester. Mechanistic studies on ß-acetoxyethylidene have indicated the possibilities of three rearrangement pathways to the formation of vinyl acetate: a proton shift, an acyl shift, and a cyclic rearrangement (see Figure 8). A deuterium labeling study involving the replacement of the hydrogens on the methylene carbon has indicated that the simple 1,2-H shift was the primary manner of rearrangement, with an 82% yield of product. However, a primary kinetic isotope effect may have occurred due to the greater strength of a C-D …
World Bank -Cpa Conflict: The Struggle To Define Human Rights And Development In The Philippines, Adam B. Robbins
World Bank -Cpa Conflict: The Struggle To Define Human Rights And Development In The Philippines, Adam B. Robbins
Honors Theses
This thesis analyzes the interactions between the World Bank (hereafter, the Bank) and the Cordillera Peoples Alliance (CPA), an indigenous and environmental advocacy group based in the Cordillera region of Luzon, in the Philippines. Using data gathered through both text-based and participatory research methods, I analyze the discursive relationship and violent confrontations between the two organizations. Conflicting development and human rights values cause the majority of these conflicts. I focus on how each organization enacts development and human rights, and how this leads to conflict. Ultimately, I intend for this thesis to offer practical guidance for the reader involved in …
Developing A Tool To Assess Human Health Impacts Of Purchasing, Kaitlin C. Himmelmann
Developing A Tool To Assess Human Health Impacts Of Purchasing, Kaitlin C. Himmelmann
Honors Theses
Chemical production impacts the environment and human health. Many common products contain chemicals that can be detrimental to human health and more specifically harmful to the endocrine system. Many individuals and institutions unknowingly buy products containing chemicals that can harm the endocrine system. I developed a score that examines the level of harm that these chemicals pose to the endocrine health of the general population. The implications of Colby’s purchasing practices are discussed.
Detailed Mechanistic And Optimization Of The Photochemical Production Method Of Superoxide, Ta-Chung Ong
Detailed Mechanistic And Optimization Of The Photochemical Production Method Of Superoxide, Ta-Chung Ong
Honors Theses
The highly reactive nature of superoxide anion presents an analytical challenge to prepare stable standards for instrument calibration. McDowell et al. (1983) developed a convenient method of superoxide production based on continuous photolysis of benzophenone and acetone in oxygen saturated, alkaline, 2-propanol solution. In the McDowell reaction, ketones are photolyzed to their triplet state, and then reacted with alcohol to produce ketyl radicals that react with oxygen to produce superoxide. This study investigated the mechanism and rate of these reactions by Laser Flash Photolysis (LFP). Reaction rate constants for the reaction between the benzophenone triplet and ethanol was 5.5 x …
Gauguin : Generating Art Using Genetic Algorithms & User Input Naturally, Thomas E. Cook
Gauguin : Generating Art Using Genetic Algorithms & User Input Naturally, Thomas E. Cook
Honors Theses
This paper outlines an undergraduate research project demonstrating an application of evolutionary computation in the context of computer art. The project, named GAUGUIN, combines the visual impact of modern computer graphics with the computational power of genetic algorithms. GAUGUIN allows the user to become a creator of art, without requiring any technical or artistic training. By using an intuitive and easily comprehensible process like evolution to create the composition, the user simply needs to evaluate a sequence of compositions. Mimicking the biological process of evolution, the system will evolve the works in order to achieve images that are more visually …
Concomitant Polymorphism In 1,2-Bis(9-Anthryl)Acetylene, Rebecca Goldstein
Concomitant Polymorphism In 1,2-Bis(9-Anthryl)Acetylene, Rebecca Goldstein
Honors Theses
This thesis details the serendipitous discovery of the phenomenon of concomitant conformational polymorphism found to exist in 1,2-bis(9-anthryl)acerylene. 1,2-bis(9anthryl)acetylene is a previously published molecule. However, the published crystal structure showed the molecule to be completely planar, and to crystallize in the form of orange needles. While this form of the crystal was indeed found during the synthesis of 1,2-bis(9anthryl)acetylene, a new polymorph, crystallizing as yellow prisms, was also discovered. This yellow polymorph was found by X-ray crystallography to be monoclinic with an angle of 66.7 between the anthracene planes. The planar polymorph 1,2-bis(9-anthryl)acetylene was also found by X-ray crystallography to …
Pov-It: The Pov-Ray Interactive Tutorial, Eleanor O'Rourke
Pov-It: The Pov-Ray Interactive Tutorial, Eleanor O'Rourke
Honors Theses
The Persistence of Vision Ray Tracer, commonly known as POV-Ray, is a computer graphics package that can be used to produce highly sophisticated and photorealistic images and animations. POV-Ray is widely used in the computer graphics community for a diverse variety of applications, including teaching college courses, creating visual music animations, and generating computer art. Although the popularity of POV-Ray is apparent, the teaching materials available for the package are confusing, disorganized, and inaccessible. In this project, I have designed an online system that provides a series of interactive tutorials that teach users how to create images using the POV-Ray …
External Control Of Electron Temperature In Ultra-Cold Plasmas, Roy O. Wilson
External Control Of Electron Temperature In Ultra-Cold Plasmas, Roy O. Wilson
Honors Theses
This thesis discusses progress towards achieving external control of the electron temperature and the Coulomb coupling parameter of ultra-cold plasmas. Using a Littman dye laser, we create the plasma by partially photoionizing a dense, cold sample of rubidium atoms in a magneto-optical trap (MOT). At a controllable time delay, we excite neutral atoms in the plasma to a specific Rydberg state using a narrow bandwidth pulsed dye laser. We have made progress towards optimizing and quantifying the achievable Rydberg atom density by using mm-wave spectroscopy to control the evolution of a cold dense Rydberg sample to plasma and have also …