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Articles 1 - 5 of 5
Full-Text Articles in Physical Sciences and Mathematics
Insights Into The Evolution Of The Great Plains Grassland Ecosystem Over The Last 5 Million Years From Paleotemperature And Paleovegetation Records, Anne Fetrow
Honors Program Theses
Over the last 10 million years, the Great Plains transitioned to the modern C4 grass dominated ecosystem. Well-preserved late Miocene to Holocene fossils and paleosols make the Meade Basin in southwest Kansas, USA a unique place to determine how paleoenvironmental conditions changed during C4 grassland evolution. δ18O values of paleosol carbonates (δ18Ocarb) in the Meade Basin decreased from the Miocene to Holocene while δ13C values increased; these trends were interpreted as an increase in temperature and/or in aridity coincident with an increase of C4 grass biomass on the landscape. …
Synthesis Of Pyridone Ligands And Iron Precursors For The Development Of Iron-Based Hydrogenation Catalysts, Becky Hanscam
Synthesis Of Pyridone Ligands And Iron Precursors For The Development Of Iron-Based Hydrogenation Catalysts, Becky Hanscam
Summer Research
Green chemistry is concerned with the development of safer, more efficient, and more environmentally acceptable chemical products and processes. An important aspect of green chemistry is the reduction of chemical waste. Catalysis is essential to achieving such a transformation. Hydrogenation is an example of an industrially important catalytic process. Hydrogenation reactions are common in the pharmaceutical industry as they provide a cost-effective and reliable approach to a wide range of compounds. However common hydrogenation catalysts are composed of expensive and toxic metals. The goal this research is to develop hydrogenation catalysts, based on iron, that will be less expensive and …
Developing Catalysts For Improving Direct Amide Formation, Courtney Carley
Developing Catalysts For Improving Direct Amide Formation, Courtney Carley
Summer Research
The widespread occurrence of the amide functional group in the pharmaceutical industry and its prevalence in biological structures such as proteins illustrate the huge impact that amides have on our daily lives. Current methods of forming amides are expensive and harmful to the environment, so there is a need for the development of greener processes for the formation of amides. The first objective of this research is to synthesize catalysts for the direct formation of amides from carboxylic acids and amines. Previously developed catalysts for this transformation are not active enough, and are thus rarely used. The new catalysts to …
Integral Generalized Binomial Coefficients Of Multiplicative Functions, Imanuel Chen
Integral Generalized Binomial Coefficients Of Multiplicative Functions, Imanuel Chen
Summer Research
The binomial coefficients are interestingly always integral. However, when you generalize the binomial coefficients to any class of function, this is not always the case. Multiplicative functions satisfy the properties: f(ab) = f(a)f(b) when a and b are relatively prime, and f(1) = 1. Tom Edgar of Pacific Lutheran University and Michael Spivey of the University of Puget Sound developed a Corollary that determines which values of n and m will always have integral generalized binomial coefficients for all multiplicative functions. The purpose of this research was to determine as many patterns within this corollary as possible as well as …
Building An Algebraic Representation Of The Aes In Sage, Thomas Gagne
Building An Algebraic Representation Of The Aes In Sage, Thomas Gagne
Summer Research
First developed in 2001, the Advanced Encryption Standard (AES) cipher is now one of the most commonly used encryption algorithms worldwide. However, the algebraically simple description of the AES leads some cryptographers to question whether an algebraic weakness in the cipher exists, which would be fatal to the security of the AES. This summer, I studied the algebraic properties of the AES with the goal of designing a computational tool for researchers and algebraic cryptanalysts of the AES which would allow more rigorous study of the algebraic qualities of the AES. I accomplished this by implementing an algebraic representation of …