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GGR100H1 Lecture 14: Lecture 14 notes

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yellowmouse866
29 Jan 2011
School
UTSG
Department
Geography
Course
GGR100H1
Professor
Joseph Leydon

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Document Summary

Ggr323 - aids epidemic & treatment of females. Tend to link to process of sexuality - missing huge portion of picture. As society, tend not to deal with it - especially in developing countries epidemic. Taken attention away from h iv/aids and transmission process. In developing world countries, infection rates highest among young females - huge social costs (family and society, cohesion of society, etc) Taking away centre of population and what"s left behind is young and elderly group. Increasing number of orphans because parents are dying - social destruction. Losing leadership and future potential of society. Cost to health care & implication for health care. More attention given to drugs for h iv/aids rather than other parts of health care. Diseases such as malaria are not being funded because of aids. Most people die because their immune system is affected. Drug companies have no interest into doing research to cure disease.

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Related Questions

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http://harvardmagazine.com/2006/11/the-ethanol-illusion.html
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Situations arise in engineering when we want to control the flow rate of a solution. This solution could be pumped into a holding tank, distillation column, heat exchanger, reactor, etc. This means that the flow rate becomes a function of time. When we turn on a pump, the flow rate is (for the most part) constant. The problem is that we may want the flow rate to be very fast at first, and then very slow towards the end of the process. This is especially true in certain chemical reactors where the concentration of reactants is always important. Control systems that could handle this type of situation are very expensive. Pumps (relatively speaking) are cheap. So, having a bank of pumps will usually solve the problem. The pumps are simply turned on or off to regulate the flow. Mathematically, this amounts to taking the volumetric flow rate function and finding a piecewise-linear approximation. Suppose that, because of the application we are running, we need a flow rate given by the function ,where t is in hours and v(t) is in 100 cubic feet per hour (e.g., v(0)=1 which means that at time t=0, we need a flow rate of 1*100=100 cubic feet per hour). Find a linear approximation and a piecewise-linear approximation using first two lines and then three lines. Think about what using more lines would do to the approximation. You will need to find suitable values of t to be able to find your approximation. As a further exercise, try to find values of t for your approximation that keeps the error (i.e., the difference between the approximation and the real function v(t) ) less than 0.1.Hint: to help with this, ask yourself this question: where would more lines be useful - where the function changes a lot or where the function changes a little?]