Improving Precipitation Hardened Al-Sc-Zr High Temperature Aluminum Alloys With New Element X

By Jeffrey D. Lin   |   Materials Science & Engineering   |   September 14, 2015   |   NURJ Online 2014-15

A new class of precipitation-strengthened aluminum superalloys with part per million additions of scandium and zirconium has been developed as a promising lightweight material for use in high temperature aerospace and automotive structural components1–4. Traditional precipitation-strengthened alloys are unable to be used at elevated temperatures since the second-phase particles that provide resistance against plastic deformation grow too big at temperatures beyond 200ºC to be effective5.

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A Self Assembled Organic/Inorganic Nanostructure for Photovoltaic Applications

By Julian Minuzzo   |   Materials Science and Engineering   |   NURJ 2013-14 ("Best Senior Thesis" issue)

Low-cost, scalable photovoltaics are of particular importance because they may allow for the widespread implementation of solar energy.  Herein, a low-cost self assembly process is used to fabricate ordered heterojunction solar cells in the form of a lamellar structure of alternating organic/inorganic domains.  The domains grow as high-aspect ratio wires on a transparent PEDOT:PSS-coated indium tin oxide (ITO) substrate.

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Functional Inequalities for Gaussian and Log-Concave Probability Measures

By Ewain Gwynne   |   Mathematics   |   NURJ 2013-14 ("Best Senior Thesis" issue)

We give three proofs of a functional inequality for the standard Gaussian measure originally due to William Beckner. The first uses the central limit theorem and a tensorial property of the inequality. The second uses the Ornstein-Uhlenbeck semigroup, and the third uses the heat semigroup. These latter two proofs yield a more general inequality than the one Beckner originally proved.

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Testing the Minimax Theorem in the Field

By Christopher Rowe   |   MMSS   |   NURJ 2013-14 ("Best Senior Thesis" issue)

John von Neumann’s Minimax Theorem is a central result in game theory, but its practical applicability is questionable. While laboratory studies have often rejected its conclusions, recent field studies have achieved more favorable results.  This thesis adds to the growing body of field studies by turning to the game of baseball.  Two models are presented and developed, one based on pitch location and the other based on pitch type.  Hypotheses are formed from assumptions on each model and then tested with data from Major League Baseball, yielding evidence in favor of the Minimax Theorem.

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A Simple Model for BMI Change in a Social Network

By William E. Krinsman   |   Department of Applied Mathematics   |   NURJ Online 2014-15

The obesity epidemic is both highly known and highly visible, yet also little understood. In a landmark paper in the New England Journal of Medicine in 2007, Fowler and Christakis [1] presented evidence suggesting that obesity might spread socially. That is, an essential part of the epidemiology of obesity may involve the social interactions between people and the spread of new behaviors throughout a social network. Although such ideas are not novel for other public health crises, such as smoking or other drug use, given that obesity is dependent on a whole suite of different lifestyle patterns, this result was surprising to many.

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