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How Do I Boil an Egg?. Recipe #1 Put the egg into a pan of boiling water, (cook for three minutes), then plunge into cold water. Alternatively, put the.

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Presentation on theme: "How Do I Boil an Egg?. Recipe #1 Put the egg into a pan of boiling water, (cook for three minutes), then plunge into cold water. Alternatively, put the."— Presentation transcript:

1 How Do I Boil an Egg?

2 Recipe #1 Put the egg into a pan of boiling water, (cook for three minutes), then plunge into cold water. Alternatively, put the eggs into a pan of cold water and it bring to the boil, then remove the heat and let the pan stand with its lid on for about seventeen minutes, finally cool the eggs with cold water. http://newton.ex.ac.uk/teaching/CDHW/egg/#hard

3 Recipe #2 To obtain a simple formula the problem must be idealised somewhat, so the egg will be treated as a spherical homogeneous object of mass M and initial temperature T egg. If the egg is placed straight into a pan of boiling water at T water, it will be ready when the temperature of the yolk T yolk, at a point midway between the shell and the centre of the egg, has risen to ~63°C. With these assumptions, the cooking time t can be deduced by solving a heat diffusion equation. http://newton.ex.ac.uk/teaching/CDHW/egg/#hard

4 Compare Recipe #1 Put the egg into a pan of boiling water, (cook for three minutes), then plunge into cold water. Alternatively, put the eggs into a pan of cold water and it bring to the boil, then remove the heat and let the pan stand with its lid on for about seventeen minutes, finally cool the eggs with cold water. Recipe #2 To obtain a simple formula the problem must be idealised somewhat, so the egg will be treated as a spherical homogeneous object of mass M and initial temperature T egg. If the egg is placed straight into a pan of boiling water at T water, it will be ready when the temperature of the yolk T yolk, at a point midway between the shell and the centre of the egg,…

5 Whats a Peer-Reviewed Article?

6 Article #1 CosmoGirl!, May 2004 v6 i4 p162(1) No place called home: homelessness in the United States is on the rise--and many of the people forced out of their homes are under 25. Why is this happening? (Issues) Liz Welch.

7 Article #2 Journal of Urban Affairs, Summer 2003 v25 i3 p335(21) Determinants of homelessness in metropolitan areas. (Author Abstract) Barrett A. Lee; Townsand Price- Spratlen; James W. Kanan. Author's Abstract: COPYRIGHT 2003 Blackwell Publishers Ltd. Why do rates of homelessness differ across metropolitan contexts? Only tentative answers to this question are provided by previous investigations due to their reliance on a limited range of settings and independent variables. In an effort to be more comprehensive, we use 1990 Census S-Night data for 335 metropolitan areas to test explanations that stress the local housing market, economic conditions, demographic composition, the safety net, climate, and community transience as potential determinants of homelessness. Our analysis uncovers support for each explanation. However, median rent level has the dominant effect (+) on metro homelessness rates, followed by the percentage of single-person households (+). The robustness of these findings is demonstrated and their theoretical, methodological, and policy implications are considered.

8 Compare Article #1 CosmoGirl!, May 2004 v6 i4 p162(1) No place called home: homelessness in the United States is on the rise--and many of the people forced out of their homes are under 25. Why is this happening? (Issues) Liz Welch. Article #2 Journal of Urban Affairs, Summer 2003 v25 i3 p335(21) Determinants of homelessness in metropolitan areas. (Author Abstract) Barrett A. Lee; Townsand Price-Spratlen; James W. Kanan. Author's Abstract: COPYRIGHT 2003 Blackwell Publishers Ltd. Why do rates of homelessness differ across metropolitan contexts? Only tentative answers to this question are provided by previous investigations due to their reliance on a limited range of settings and independent variables. In an effort to be more comprehensive, we

9 How do I select one or the other?


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