science

Johannes Hendrikus Kern

Johannes Hendrikus Kern 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 Johannes Hendrikus Kern rather than just read about it. In short: Johannes Hendrikus Kern (1903–1974) was a Dutch botanist, with an international reputation as an expert on the Cyperaceae (the sedge family). Kern graduated from a secondary school in Nijmegen in 1922 with a diploma qualifying him as a teacher.

Key takeaways

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

Reference excerpt

Johannes Hendrikus Kern (1903–1974) was a Dutch botanist, with an international reputation as an expert on the Cyperaceae (the sedge family). Kern graduated from a secondary school in Nijmegen in 1922 with a diploma qualifying him as a teacher. He received further diplomas: in 1927 for head-teacher, in 1928 for French, and in 1933 for German. He was an elementary school teacher from 1922 to 1927 at Mill, and from 1927 to 1940 at Vlaardingen. He was a head-teacher from 1940 to 1942 at Dedemsvaart, from 1942 to 1946 at Gorinchem, and from 1946 to 1949 at Nijmegen. From his youth he studied botany and, in particular, the flora of the Netherlands. In 1924 he published a paper on Netherlands plants belonging to the genus Carex. Impressed by Kern's presentations at meetings of the Royal Botanical Society of the Netherlands, van Stennis in 1949 offered Kern employment at the Bogor Botanical Gardens. Kern eagerly accepted and first worked on a revision of the Viburnum Malesia part of the multi-volume Flora Malesiana and then worked on a revision of the sedge family part of Flora Malesiana. He returned from Bogor to the Netherlands in November 1952 to join the staff of the Flora Malesiana Foundation, located in Leiden's Rijksherbarium. In June 1957 he became a staff member of the Rijksherbarium, where he worked on the Cyperaceae of Malesia and nearby regions. In August 1961 he gave a lecture New Look at Cyperaceae at the Norwich Meeting of the British Association for the Advancement of Science. In January 1969 Kern officially retired from the Rijksherbarium and was appointed an honorary collaborator there. In 1970 the University of Nijmegen appointed him doctor honoris causa.

Selected publications "The genus Viburnum in Malaysia". Reinwardtia. 1: 107–170. 1951. "Viburnum". Flora Malesiana. series I. 4: 175–194. 1951. "A neglected Indian species of Cyperus". Reinwardtia. 1: 463–466. 1952. "Some new Cyperaceae". Blumea. 12: 23–30. 1963. "A new Hawaiian Gahnia (Cyperaceae)". Blumea. 12: 349–351. 1964.

References

External links Data related to Johannes Hendrikus Kern at Wikispecies

Worked examples

Example 1 — a first encounter with Johannes Hendrikus Kern

Start with the simplest possible case. Write down what Johannes Hendrikus Kern 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 Johannes Hendrikus Kern 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 Johannes Hendrikus Kern 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 Johannes Hendrikus Kern

In research: Johannes Hendrikus Kern 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 Johannes Hendrikus Kern 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: Johannes Hendrikus Kern is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1903 births, 1974 deaths, 20th-century Dutch botanists, so understanding it makes those chapters shorter.
In everyday life: Look for Johannes Hendrikus Kern 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 Johannes Hendrikus Kern in 20 minutes

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

Frequently asked questions

What is Johannes Hendrikus Kern in simple terms?

Why does Johannes Hendrikus Kern 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 Johannes Hendrikus Kern?

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 Johannes Hendrikus Kern.