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Yamakawa Kenjirō

Yamakawa Kenjirō 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 Yamakawa Kenjirō rather than just read about it. In short: Baron Yamakawa Kenjirō (山川 健次郎; 9 September 1854 – 26 June 1931) was a Japanese samurai, politician, physicist, academic administrator, and author of several histories of the Boshin War. He served as president of Tokyo Imperial University, Kyushu Imperial University, and Kyoto Imperial University.

Yamakawa Kenjirō — main illustration
Yamakawa Kenjirō — illustration

Key takeaways

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

Reference excerpt

Baron Yamakawa Kenjirō (山川 健次郎; 9 September 1854 – 26 June 1931) was a Japanese samurai, politician, physicist, academic administrator, and author of several histories of the Boshin War. He served as president of Tokyo Imperial University, Kyushu Imperial University, and Kyoto Imperial University. He also served as a Privy Councilor and a member of the House of Peers. Though his name is commonly written "Yamakawa," he himself wrote it as "Yamagawa" in English.

Biography Yamakawa was born as the third son to Yamakawa Naoe, a senior samurai of the Aizu Domain (present day Fukushima Prefecture). He became a member of the Byakkotai, a unit of the newly reorganized Aizu domain army composed mostly of boys aged 15 to 17 years, who fought in defense of Aizu during the Boshin War. After the Meiji Restoration, through the mediation of the Zen monk Kawai Zenjun, Yamakawa was placed in the care of Chōshū retainer Okudaira Kensuke. Yamakawa was sent by the new Meiji government to study physics at Sheffield Scientific School, Yale University, where he was the first student from Japan to graduate. On his return to Japan, he was posted to Tokyo Imperial University working as an assistant and interpreter, and became Japan’s first Japanese professor of physics in 1879. (There had already been several foreign professors, such as Thomas Corwin Mendenhall and William Edward Ayrton.) During the Meiji and Taishō periods he helped found the Kyushu Institute of Technology in 1907 and served as president of Tokyo Imperial University (1901–1905 and 1913–1920), Kyushu Imperial University (1911–1913), and Kyoto Imperial University (1914-1915). He was later ennobled with the title of danshaku (baron) under the kazoku peerage system. Later in his life he was also a Privy Councilor (appointed in February 1923) and a member of the House of Peers. He and his brother Yamakawa Hiroshi are known amongst historians of the late Edo period as authors of two monumental texts—Kenjirō's being "Aizu Boshin Senshi," which catalogues the actions of his home domain during the war. He also authored several other history texts, including "Hoshū Aizu Byakkotai Jūkyūshi-den," which he wrote with fellow Aizu native Munekawa Toraji. Yamakawa's sisters, Yamakawa Futaba (1844–1909) and Yamakawa Sutematsu (1860–1919), later Princess Ōyama Sutematsu (大山 捨松), are also well-known. Futaba, who fought in the Battle of Aizu during the Boshin War, later worked at the Tokyo Women's Normal School (東京女子高等師範学校, Tōkyō Joshi Kōtō Shihan Gakkō), the forerunner of Ochanomizu University. Sutematsu was one of five Japanese girls sent to the United States as part of the Iwakura Mission; she was the first Japanese graduate of Vassar University, and later became the wife of Imperial Japanese Army general Ōyama Iwao.

Honours From the Japanese Wikipedia article

Titles Baron (1 December 1915)

Decorations Grand Cordon of the Order of the Sacred Treasure (25 June 1920; Second Class: 27 June 1912; Third Class: 27 December 1899; Fourth Class: 25 December 1896; Fifth Class: 21 June 1895; Sixth Class: 27 June 1891) Grand Cordon of the Order of the Rising Sun (21 April 1928; Second Class: 1 April 1916; Third Class: 1 April 1906) Grand Cordon of the Order of the Paulownia Flowers (26 June 1931, posthumous)

References and further reading Hoshi Ryōichi (2003). Yamakawa Kenjiro Den. Heibonsha. ISBN 4-582-83181-8. Marshall, Byron K. The Tradition of Conflict in the Governance of Japan's Imperial Universities. History of Education Quarterly, Vol. 17, No. 4 (Winter, 1977), pp. 385–406 Yamakawa Kenjiro (1931). Aizu Boshin Senshi. Tokyo: Tokyo Daigaku Shuppankai.

External links Kenjiro Yamakawa and Meisenkai History of Japan-Yale relations Archived 2012-11-03 at the Wayback Machine

Illustrations

Yamakawa Kenjirō illustration

Worked examples

Example 1 — a first encounter with Yamakawa Kenjirō

Start with the simplest possible case. Write down what Yamakawa Kenjirō 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 Yamakawa Kenjirō 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 Yamakawa Kenjirō 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 Yamakawa Kenjirō

In research
Yamakawa Kenjirō 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 Yamakawa Kenjirō 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
Yamakawa Kenjirō is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1854 births, 1931 deaths, 20th-century Japanese historians, so understanding it makes those chapters shorter.
In everyday life
Look for Yamakawa Kenjirō 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 Yamakawa Kenjirō in 20 minutes

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

Frequently asked questions

What is Yamakawa Kenjirō in simple terms?

Baron Yamakawa Kenjirō (山川 健次郎; 9 September 1854 – 26 June 1931) was a Japanese samurai, politician, physicist, academic administrator, and author of several histories of the Boshin War. He served as president of Tokyo Imperial University, Kyushu Imperial University, and Kyoto Imperial University.

Why does Yamakawa Kenjirō 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 Yamakawa Kenjirō?

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 Yamakawa Kenjirō.

Tags

  • 1854 births
  • 1931 deaths
  • 20th-century Japanese historians
  • Academics from Fukushima Prefecture
  • Aizu-Matsudaira retainers
  • Japanese physicists
  • Kazoku
  • Kyushu University
  • Members of the House of Peers (Japan)
  • People of the Meiji Restoration
  • Presidents of Kyoto University
  • Presidents of the University of Tokyo

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