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He County

He County is a science 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 He County rather than just read about it. In short: He County or Hexian (simplified Chinese: 和县; traditional Chinese: 和縣; pinyin: Hé Xiàn) is a county in the east of Anhui Province, China, under the jurisdiction of Ma'anshan. It has a population of 650,000 and an area of 1,412 square kilometres (545 mi2).

He County — main illustration
He County — illustration

Key takeaways

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

Reference excerpt

He County or Hexian (simplified Chinese: 和县; traditional Chinese: 和縣; pinyin: Hé Xiàn) is a county in the east of Anhui Province, China, under the jurisdiction of Ma'anshan. It has a population of 650,000 and an area of 1,412 square kilometres (545 mi2). The government of He County is located in Liyang Town.

History From 1965 to 2011, He County was under the jurisdiction of Chaohu. On August 22, 2011, the Anhui provincial government reorganized the province and split Chaohu into three parts that were absorbed by neighboring prefecture-level cities.

Geography He County is located on the northern bank of the Yangtze River. He County borders Chuzhou to the northwest, Nanjing to the northeast, the three urban districts of Ma'anshan to the east, Wuhu to the south, and Hanshan County to the west. He County has a total area of 1318.6 square kilometers (509 sq mi), of which 48% is arable land. He County is situated on the Yangtze Plain and has relatively flat terrain in the southeast, with ponds dotting the alluvial plains, with the northwest of the county consisting of rolling hills.

Climate

Administrative divisions He County has jurisdiction to 9 towns. Its 1 former town and 4 former townships were merged to other towns.

9 Towns

Archaeology

The human remains discovered at Hexian includes a vault, cranial fragments, mandibular, and dental elements catalogued as PA830-PA835 and PA840-PA845. The site containing hominin material was excavated in 1980 and May through June 1981 by IVPP teams alongside many other transitional mammalian fossils in layer 4 of Longtan Cave. Cui and Wu (2015) suggest that although the site is around 400 ka, better dating will be required. It was once called Homo erectus hexianensis, but other studies suggest that the differences in the specimen are not differentiating on the subspecies-level.

Cranium The skull (PA830) was discovered in several fragments lacking most of the basicranium. In 1982, the endocast was reconstructed and the cranial capacity was measured to be 1025. The frontal and temporal lobes are almost complete, while the parietal and occipital lobes are complete. Otherwise, the exterior specimen is very well preserved. During the 1981 excavations, a right supraorbital torus and parietal were reported. The thickness, profile, brow, and distinct nuchal-occipital boundary are alike Chinese Homo erectus. However, a lack of postorbital constriction, increased width, a curved sagittal profile, a long parietal, and a high temporal are unlike these groups. Aside from the vault, two parietals, PA840 and PA841, are known.

Mandible The dental-mandibular remains were discovered in 1980 alongside the vault in excavation pit 3C. The mandible is PA831, and four isolated teeth are PA832, PA833, PA834-1, and PA834-2; PA835 is another tooth. 831 is a mandible with M2 and M3 in place, with a P3-P4 septum remaining in place. The mandible is thought to belong to a young adult individual, but sex estimation is not possible. The mandibular body was robust, and a well-differentiated mylohyoid line and a posteriorly-positioned lateral prominence are derived traits. Overall, the mandible has no Neanderthal traits, but quite similar to Homo antecessor. The teeth are characteristic of Homo erectus.

Classification Liu et al. (2017) suggest that the Hexian hominins either belong to the same robust-jawed paleodeme as the Penghu hominin, or a robust morph of mainland Homo erectus. Overall, the morph displays primitive traits that is roughly contemporaneous with the hominins at Zhoukoudian. Wu et al. (2006) suggest that the differences are on account of local variation rather than subspecies-level differences, and that the Zhoukoudian sample is not representative of the taxon's full diversity. In comparison with Zhoukoudian, the Hexian crania are derived in the frontal and posterior regions, but derived towards Indonesian populations in the lateral region. Cui and Wu (2015) suggest that these are either retentions or gene flow between regions.

Notable people Zhang Ji, Tang dynasty poet and author Jackie Chan, actor and martial artist (ancestry) Xu Haifeng, first Chinese gold Olympic medal winner Shou-Wu Zhang, mathematician

References

Illustrations

He County illustration
He County illustration
He County illustration

Worked examples

Example 1 — a first encounter with He County

Start with the simplest possible case. Write down what He County claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, 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 He County 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 He County 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 He County

In research
He County appears in science 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 He County 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
He County is common in secondary-school and first-year university syllabi. It links to neighbouring topics County-level divisions of Anhui, Ma'anshan, Paleoanthropological sites, so understanding it makes those chapters shorter.
In everyday life
Look for He County 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 He County in 20 minutes

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

Frequently asked questions

What is He County in simple terms?

He County or Hexian (simplified Chinese: 和县; traditional Chinese: 和縣; pinyin: Hé Xiàn) is a county in the east of Anhui Province, China, under the jurisdiction of Ma'anshan. It has a population of 650,000 and an area of 1,412 square kilometres (545 mi2).

Why does He County matter?

Because it connects several science 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 He County?

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 He County.

Tags

  • County-level divisions of Anhui
  • Ma'anshan
  • Paleoanthropological sites

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