Q-Polynomial Association schemes with Irrational Eigenvalues

We work towards classifying the feasible parameter sets of irrational Q-polynomial association schemes with three classes. We aimed to provide a synopsis of the subject as well as provide some theorems and conjectures to understand these combinatorial objects

Managing Costa Rica\u27s Waste

In May 2010, Costa Rica passed the Law for the Integrated Management of Residues, which stated that lawmakers would pass specific decrees to improve solid waste management. We worked with GTZ and CYMA to provide recommendations for these decrees. We researched international programs and conducted a focus group and interviews with key stakeholders in order to determine feasible Market-Based Instruments to improve waste management. To this end, we recommend that Costa Rica gradually implement Eco-labeling, Pay-As-You-Throw, and Deposit-Refund