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

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

Cover, Editors\u27 Note and Table of Contents

Cover, editors\u27 note, and table of contents for volume 2 of the Proceedings of the Interdisciplinary STEM Teaching and Learning Conference

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

High-Yield Hydrogen Production from Starch and Water by a Synthetic Enzymatic Pathway

BACKGROUND: The future hydrogen economy offers a compelling energy vision, but there are four main obstacles: hydrogen production, storage, and distribution, as well as fuel cells. Hydrogen production from inexpensive abundant renewable biomass can produce cheaper hydrogen, decrease reliance on fossil fuels, and achieve zero net greenhouse gas emissions, but current chemical and biological means suffer from low hydrogen yields and/or severe reaction conditions. METHODOLOGY/PRINCIPAL FINDINGS: Here we demonstrate a synthetic enzymatic pathway consisting of 13 enzymes for producing hydrogen from starch and water. The stoichiometric reaction is C(6)H(10)O(5) (l)+7 H(2)O (l)→12 H(2) (g)+6 CO(2) (g). The overall process is spontaneous and unidirectional because of a negative Gibbs free energy and separation of the gaseous products with the aqueous reactants. CONCLUSIONS: Enzymatic hydrogen production from starch and water mediated by 13 enzymes occurred at 30°C as expected, and the hydrogen yields were much higher than the theoretical limit (4 H(2)/glucose) of anaerobic fermentations. SIGNIFICANCE: The unique features, such as mild reaction conditions (30°C and atmospheric pressure), high hydrogen yields, likely low production costs ($∼2/kg H(2)), and a high energy-density carrier starch (14.8 H(2)-based mass%), provide great potential for mobile applications. With technology improvements and integration with fuel cells, this technology also solves the challenges associated with hydrogen storage, distribution, and infrastructure in the hydrogen economy