Static and Dynamic Pressure Distributions in a Short Labyrinth Seal

As part of a study into turbine blade tip destabilizing forces, a seals test rig was built in which spin rate, circular whirl rate, direction and amplitude of inlet swirl angle, and eccentricity can all be controlled over wide ranges, and measurements can be made at gap Reynolds numbers up to about 2 x 10(exp 4). This facility is described and preliminary data is presented for a one cavity labyrinth seal with a flat, stator mounted land. The impact of different flow coefficients for the first and second knives on the rotordynamic coefficients was found. While this effect is dominant for the direct forces, it should also be incorporated into calculations of cross forces where it has an impact under many conditions

Heat transfer in a plane incompressible laminar jet

Partial differential equation for heat transfer in plane incompressible laminar jet is reduced by similarity transformation to ordinary differential equatio

Trend Breaks and Seasonality in the Yugoslav Black Market for Dollars, 1974-1987

We estimate a model of the black market premium for dollars in Yugoslavia from 1974-1987. Unlike previous applications of the model, our analysis addresses nonstationarity in the underlying data by allowing for trend breaks. Endogenous structural break tests indicate the presence of breaks closely associated with the death of Tito and changes in laws affecting the operation of the black market. After accounting for these breaks, we find strong support for the underlying model. In addition, we find evidence consistent with the era of increased government involvement in the black market leading to greater volatility of the premium following regime change.

Deposition of platinum particles on surface-modified carbon ultramicroelectrodes

Nanoparticles are used as electrocatalysts due to their large surface area-to-volume ratios. Most studies of nanoparticle electrocatalysis are performed on collections of particles on a support, which represent ensemble average behavior influenced by spatial distribution of the nanoparticles. Therefore, recent emphasis has been placed on analyzing electrocatalytic behavior of single particles. The focus here is to develop carbon ultramicro- and nanoelectrode platforms for studying the electrocatalytic properties of single metal nanoparticles. Ultramicroelectrodes were prepared using chemical vapor deposition of carbon in pulled quartz capillaries. Electrode diameters were determined by cyclic voltammetry. Electrodes were modified using a soft nitriding technique to enable immobilization of platinum nanoparticles through reduction of H2PtCl6 using NaBH4. Cyclic voltammetry was used to determine the presence of platinum particles through characteristic peaks associated with Pt oxide formation and reduction. Ultimately, these electrodes could be used to analyze single uncapped nanoparticles to understand the electrochemical properties of single nanoparticles

Plurinationalism, Interculturalism, and Rights of Nature: A look at Ecuador’s Indigenous Activism

Senior Project submitted to The Division of Social Studies of Bard College

An Exploration of Climate Change in the K-12 Classroom

Have you ever wondered how climate change is being taught and portrayed in the school age classroom? How current science is being translated and used to teach the next generation? This work explores the studies of climate change education occurring in North America. It is seeking to understand the educational methods and content foci being suggested as reliable practices in climate change education through the use of a qualitative analysis of academic literature on teaching climate change. Findings summarize how climate change is being taught, what recommendations are being made, and identifies opportunities for growth, and other possible concerns

A Comparison of Rabelais\u27s Ideas on Intellectual, Religious, and Social Freedom with those of Montaigne, Calvin, and Marguerite de Navarre

(From the Introduction) The characteristic intellectual manifestation of the Renaissance in France was the spirit of free inquiry, of revolt against traditional authority. In other words, it was the assertion of the freedom of man and of the rights of the individual. For this reason the sixteenth century marks a great change in all the provinces of the intellectual life. Here can be seen the full advent of the Italian Renaissance with its spirit of intense liberty and originality

An Introduction to Using Geographic Information Systems (GIS) in the Classroom

This interactive session will focus on examples of using GIS in multiple K-12 classroom setting, including but not limited to teaching climate change, history, natural hazards, and literature. Geographic information systems, or GIS, is an online mapping tool, used globally in a variety of professions (e.g., emergency management, city planning, engineering, scientific labs) – that is accessible and beneficial to use in the K-12 classroom! GIS helps us visualize, question, analyze, and interpret real data to understand relationships, patterns, and trends. Participants will not only walk through a demonstration of GIS’ use and potential, they will partake in and practice using GIS with hands on activities. Come join us – and bring your device