astronomy

Zhang Hanxin

Zhang Hanxin 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 Zhang Hanxin rather than just read about it. In short: Zhang Hanxin (1 January 1936 – 1 October 2021) was a Chinese scientist specializing in fluid mechanics, and an academician of the Chinese Academy of Sciences. He was chairman of Chinese Aerodynamics Research Society.

Key takeaways

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

Reference excerpt

Zhang Hanxin (1 January 1936 – 1 October 2021) was a Chinese scientist specializing in fluid mechanics, and an academician of the Chinese Academy of Sciences. He was chairman of Chinese Aerodynamics Research Society.

Biography Zhang was born in Pei County, Jiangsu, on 1 January 1936, during the Republic of China. He secondary studied at Xuzhou No. 2 High School. In 1954, he enrolled at Tsinghua University, majoring in the Department of Hydraulic Engineering. In 1963, he did his postgraduate work at the Institute of Mechanics, Chinese Academy of Sciences under the supervision of Guo Yonghuai. At the same time, he taught at Tsinghua University. In 1972, he was despatched to the China Aerodynamics Research and Development Center as a researcher. On 1 October 2021, he died from an illness in Beijing, aged 85.

Honours and awards 1991 Member of the Chinese Academy of Sciences

References

Worked examples

Example 1 — a first encounter with Zhang Hanxin

Start with the simplest possible case. Write down what Zhang Hanxin 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 Zhang Hanxin 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 Zhang Hanxin 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 Zhang Hanxin

In research: Zhang Hanxin 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 Zhang Hanxin 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: Zhang Hanxin is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1936 births, 2021 deaths, Academic staff of Tsinghua University, so understanding it makes those chapters shorter.
In everyday life: Look for Zhang Hanxin 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 Zhang Hanxin in 20 minutes

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

Frequently asked questions

What is Zhang Hanxin in simple terms?

Why does Zhang Hanxin 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 Zhang Hanxin?

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 Zhang Hanxin.