astronomy

Timothy A. Cohn

Timothy A. Cohn is a astronomy topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Timothy A. Cohn rather than just read about it. In short: Timothy A. Cohn (1957 – February 20, 2017) was an American hydrologist with the US Geological Survey, USGS Science Advisor for Hazards (1998–2001), and lecturer at Johns Hopkins University (2006 - ).

Key takeaways

Timothy A. Cohn belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Timothy A. Cohn to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Timothy A. Cohn from memory before moving on to harder problems.

Reference excerpt

Timothy A. Cohn (1957 – February 20, 2017) was an American hydrologist with the US Geological Survey, USGS Science Advisor for Hazards (1998–2001), and lecturer at Johns Hopkins University (2006 - ). Cohn served in the office of Senator Bill Bradley (D-NJ) in 1995-97 as a AAAS Congressional Science Fellow, and worked on the unsuccessful Bradley presidential campaign in 2000. After 2005, Cohn was a member of the Governing Board of the American Institute of Physics. Cohn's research focused on flood frequency analysis, estimation of nutrient transport in rivers, and the interpretation of trends in hydroclimatological data. Cohn's most controversial research, which has not been fully embraced by the climate science community, suggests that the significance of climate trends may be greatly overstated because it does not consider the possibility that long-term persistence is a component of climatic variability. Cohn held a B.A. in mathematics from Swarthmore College (1979) and M.A. (1984) and PhD (1986) degrees in water resource systems engineering from Cornell University. Cohn was an avid marathoner and past president of the Reston Runners organization in Reston, Virginia. Cohn was a board member of the Reston Association.

Selected publications "Estimating Contaminant Loads in Rivers: An Application of Adjusted Maximum Likelihood to Type I Censored Data," Water Resources Research 41(8), 13 pp., 2005. "The Uneasy Courtship of Science and Politics," Archived 2008-05-17 at the Wayback Machine Eos, 83(49), 3 December 2002. (Reprinted in Water Resources IMPACT, 5(2), pp. 28–29, March 2003.) "Recent Advances in Statistical Methods for the Estimation of Sediment and Nutrient Transport in Rivers," chapter 21 in Contributions in Hydrology, US National Report to the IUGG, pp. 1117–1124, 1995. Cohn contributed in several areas to the publication of Statistical Methods in Water Resources, particularly to the sections on bias correction in regression, and methods for data below the reporting limit.

References

Worked examples

Example 1 — a first encounter with Timothy A. Cohn

Start with the simplest possible case. Write down what Timothy A. Cohn claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In astronomy, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Timothy A. Cohn before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Timothy A. Cohn ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Timothy A. Cohn

In research: Timothy A. Cohn appears in astronomy research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Timothy A. Cohn in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Timothy A. Cohn is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1957 births, 2017 deaths, American hydrologists, so understanding it makes those chapters shorter.
In everyday life: Look for Timothy A. Cohn outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Timothy A. Cohn in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Timothy A. Cohn means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Timothy A. Cohn out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Timothy A. Cohn in simple terms?

Why does Timothy A. Cohn matter?

Because it connects several astronomy ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Timothy A. Cohn?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Timothy A. Cohn.