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GEO 911 Lecture Notes - Pyrethrum, American Civil War, World War I

56 views18 pages
sangriabadger141
16 May 2012
School
Ryerson University
Department
Geography
Course
GEO 911
Professor
Hersch Jacobs

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Document Summary

Life expectancy at birth: 81. 29 yrs (total population) 2003 2010 : life expectancy has gone up. Relevant to us, puts a burden on us. Over 80/85 surviving has gone up. (retired people don"t contribute to the economy, not working, they consume a lot of health care) Significant difference of life expectancy between males and females. Catch22- book: character said he was going to live forever, or die in the attempt. Over 99. 9% of organisms that have lived will become extinct (at some point the sun will too) We don"t understand what risk means, the chance and probability. Us congressman, someone proposed a bill to fund medical research, the congressman voted against the bill. He felt there was no sense in spending money, because he felt if you found a cure for a disease a new one would kill you. We as young ppl aren"t pre occupied with death as much as the elderly.

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A stent is a small, tubular device implanted into arteries orsome other hollow organ in order to provide structural supportagainst collapse. Some modern stents can even provide gradual drugdelivery. Clinical failures are some of the most serious reasonsfor continual R&D into stent improvement. Models are anindispensable part of further research as experimental testing isoften expensive and time-consuming. For example, a stent with a10-year life expectancy corresponds to approximately 400 millioncyclic loadings from heartbeats!

A common design for a stent is a hollow woven mesh of helicalwire, as shown in the above figure. Much like Chinese finger traps,a change in length is accompanied by a corresponding change inradius of the stent. The goal of this problem is to examine howthis deformations are coupled.

(a) Let’s start out by looking at a single helix of wire.Convince yourself that we can parametrize the curve of the wireby:

x(θ) =rcosθ

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