astronomy

Kenzō Yagi

Kenzō Yagi 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 Kenzō Yagi rather than just read about it. In short: Kenzō Yagi (八木健三, Yagi Kenzō; 5 September 1914 – 18 July 2008) was a Japanese mineralogist and petrologist who specialized in experimental mineralogy and petrology. Yagiite, a new mineral found in the Colomera meteorite, was named after him for its contribution to the petrology.

Key takeaways

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

Reference excerpt

Kenzō Yagi (八木健三, Yagi Kenzō; 5 September 1914 – 18 July 2008) was a Japanese mineralogist and petrologist who specialized in experimental mineralogy and petrology. Yagiite, a new mineral found in the Colomera meteorite, was named after him for its contribution to the petrology.

Life Born in Nagano on 5 September 1914, Yagi graduated from the Institute of Mineralogy, Petrology and Economic Geology, Tohoku Imperial University in 1938, where he became assistant professor in 1941. During this period he studied the alkaline rocks of the Morotu District, Sakhalin and Nemuro Peninsula, Hokkaido. He obtained his PhD in 1949, entitled "Research on special rock differentiation phenomena in Karafuto and Hokkaido". After obtaining his PhD, he received a research grant from the Fulbright Fellowship to conduct post-doctoral research in the United States. After working one year at the Colorado School of Mines, he joined the Geophysical Laboratory as a visiting scientist where he studied of the system FeO-AI2O3-SiO2 under the supervision of Norman Levi Bowen. He specialised on experimental petrology and studied alkali pyroxenes. After returning from the United States, he became professor in 1951 at the Tohoku University. He joined the Hokkaido University in 1962 until his retirement in 1978. He became member of the Japan Science Council in 1971. He focused his research mainly the experimental study of pyroxene-bearing systems, such as acmite, Titanium-bearing pyroxene, and fassaite, in order to understand the genesis of nephelinitic magma. He also devoted time to study of volcanoes in northeast Honshu and meteorites such as the Yamato meteorites found in Antarctica. After his retirement, Yagi taught at Hokusei Gakuen University from 1978 to 1988. He also became the chairman of the Hokkaido Nature Conservation Society and worked on conservation on Shiretoko National Park. In 1996, he filed a lawsuit to stop the construction of the Shihoro Kogen Road in Daisetsuzan National Park Tatsuya Hori, Hokkaido governor at the time. Construction was finally canceled with the support of the former Environment Agency director Takeichi Oishi. At the 1998 Nagano Winter Olympics, he opposed extending the men's downhill course to protect the environment. Yagi Ridge, a mountain ridge in Mount Edziza Provincial Park of British Columbia, Canada, is named after him. Yagi had been to this area in 1966.

References

Worked examples

Example 1 — a first encounter with Kenzō Yagi

Start with the simplest possible case. Write down what Kenzō Yagi 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 Kenzō Yagi 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 Kenzō Yagi 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 Kenzō Yagi

In research: Kenzō Yagi 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 Kenzō Yagi 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: Kenzō Yagi is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1914 births, 2008 deaths, Academic staff of Hokkaido University, so understanding it makes those chapters shorter.
In everyday life: Look for Kenzō Yagi 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 Kenzō Yagi in 20 minutes

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

Frequently asked questions

What is Kenzō Yagi in simple terms?

Why does Kenzō Yagi 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 Kenzō Yagi?

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 Kenzō Yagi.