astronomy

Hu Dujing

Hu Dujing 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 Hu Dujing rather than just read about it. In short: Hu Dujing (Chinese: 胡笃敬; 1913 – 25 October 2019) was a Chinese plant physiologist, agronomist, and educator. He was a long-time professor at Hunan Agricultural University and co-founded the university's Department of Botany in 1951.

Key takeaways

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

Reference excerpt

Hu Dujing (Chinese: 胡笃敬; 1913 – 25 October 2019) was a Chinese plant physiologist, agronomist, and educator. He was a long-time professor at Hunan Agricultural University and co-founded the university's Department of Botany in 1951.

Biography Hu was born in 1913 in Changsha, Hunan, Republic of China, with his ancestral home in Xiangtan. After graduating from Wuhan University, he pursued graduate studies in plant hormone and mineral nutrient at the Institute of Agriculture at National Southwestern Associated University under academician Tang Peisong. His research paper on plant growth hormone was published in the journal Science in April 1940. Hu taught at Guangdong Institute of Arts and Sciences, Sun Yat-sen University, Hubei Agricultural College (now part of Huazhong Agricultural University), Keqiang College (now part of Hunan University), and Hunan Agricultural College (now Hunan Agricultural University). In 1951, Hu Dujiang and Luo Zemin founded the Department of Botany (originally Department of Plant Physiology and Biochemistry) at Hunan Agricultural College. Under his leadership, the department established a number of key laboratories. It was recognized by the government of Hunan as a key department of the province and won a number of national and provincial awards. Hu was awarded the honour of "National Excellent Teacher" by the Chinese government and the HAU Faculty Star by Hunan Agricultural University in 1998. From 1988 to 1993, he served as a member of the Standing Committee of the Political Council of Hunan Province. Hu researched the cultivation of Eucommia ulmoides (duzhong) in Hunan to produce Eucommia ulmoides gum as a substitute for rubber. From 1978 to the 1980s, his group tested more than 70 plants and found 20 high-potassium plants for use as biological potassium fertilizer. On 25 October 2019, Hu died at the Hunan Agricultural University Hospital in Changsha, aged 106 (107 in East Asian age reckoning).

References

Worked examples

Example 1 — a first encounter with Hu Dujing

Start with the simplest possible case. Write down what Hu Dujing 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 Hu Dujing 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 Hu Dujing 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 Hu Dujing

In research: Hu Dujing 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 Hu Dujing 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: Hu Dujing is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1913 births, 2019 deaths, 20th-century Chinese botanists, so understanding it makes those chapters shorter.
In everyday life: Look for Hu Dujing 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 Hu Dujing in 20 minutes

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

Frequently asked questions

What is Hu Dujing in simple terms?

Why does Hu Dujing 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 Hu Dujing?

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 Hu Dujing.