astronomy

Johannes Falnes

Johannes Falnes 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 Johannes Falnes rather than just read about it. In short: Johannes Falnes (1931–2024) was a Professor Emeritus of Experimental Physics at the Department of Physics of the Norwegian University of Science and Technology noted for his contributions to wave energy research. He was one of the pioneers of modern wave energy research.

Key takeaways

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

Reference excerpt

Johannes Falnes (1931–2024) was a Professor Emeritus of Experimental Physics at the Department of Physics of the Norwegian University of Science and Technology noted for his contributions to wave energy research. He was one of the pioneers of modern wave energy research.

Education Falnes received his master's and doctoral degrees both from the Norwegian Institute of Technology.

Career Falnes spent his career at the Norwegian Institute of Technology (1956–1959), CERN (1959–1961), the University of Bergen (1961–1964), the Norwegian Institute of Technology/Norwegian University of Science and Technology (1965–2001), and SINTEF (1966–1972), before retiring in 2002. Falnes' main research interest has been ocean wave energy and its utilisation. Together with Kjell Budal, he initiated wave energy research in Norway in the 1970s. Falnes and Budal discovered the so-called antenna effect, where a floating point absorber could theoretically absorb far more wave energy from the sea than that which is directly incident upon its geometry, analogous to a radio antenna's ability to absorb radio waves. They also developed the latching control strategy to maximize energy extraction. In December 2006, a seminar titled Challenges for Wave Energy Technology was dedicated in tribute to Falnes on his 75th anniversary. The seminar was held in Trondheim, Norway. Wave energy experts such as Stephen Salter (University of Edinburgh), António Falcão (Instituto Superior Técnico), Alain Clément (École centrale de Nantes), and Richard Yemm (Ocean Power Delivery) addressed various topics in the seminar. Falnes is a member of The Royal Norwegian Society of Sciences and Letters and the Norwegian Academy of Technological Sciences.

Personal life Among his pastimes are hiking and cross-country skiing.

Selected publications Budal, K. & Falnes, J. (1975), "A resonant point absorber of ocean-wave power", Nature, 256 (5517): 478–479, Bibcode:1975Natur.256..478B, doi:10.1038/256478a0, S2CID 4253462 Falnes, Johannes (2002). "Optimum Control of Oscillation of Wave-Energy Converters". International Journal of Offshore and Polar Engineering. 12 (4): 147–155. Johannes Falnes (2002). Ocean Waves and Oscillating Systems. Cambridge University Press. ISBN 0-521-78211-2. Falnes, Johannes (2007). "A review of wave-energy extraction". Marine Structures. 20 (4): 185–201. Bibcode:2007MaStr..20..185F. doi:10.1016/j.marstruc.2007.09.001.

References

External links Official website

Worked examples

Example 1 — a first encounter with Johannes Falnes

Start with the simplest possible case. Write down what Johannes Falnes 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 Johannes Falnes 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 Johannes Falnes 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 Johannes Falnes

In research: Johannes Falnes 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 Johannes Falnes 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: Johannes Falnes is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1931 births, Academic staff of the Norwegian Institute of Technology, Academic staff of the Norwegian University of Science and Technology, so understanding it makes those chapters shorter.
In everyday life: Look for Johannes Falnes 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 Johannes Falnes in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Johannes Falnes 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 Johannes Falnes out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Johannes Falnes in simple terms?

Why does Johannes Falnes 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 Johannes Falnes?

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 Johannes Falnes.