astronomy

Jaakko Jalas

Jaakko Jalas 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 Jaakko Jalas rather than just read about it. In short: Arvo Jaakko Juhani Jalas (7 May 1920 – 1 December 1999) was a Finnish botanist. He worked in the University of Helsinki.

Key takeaways

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

Reference excerpt

Arvo Jaakko Juhani Jalas (7 May 1920 – 1 December 1999) was a Finnish botanist. He worked in the University of Helsinki.

Career He began his university studies in 1938, one year before the Russian–Finnish Winter War, where he fought on the front, and again in the Continuation War in 1941 and 1944. In that period, he made botanical expeditions to the disputed territory of Karelia (now the Republic of Karelia). After the war, he completed his PhD in Botany in 1950, with a dissertation entitled Zur Kausalanalyse der Verbreitung einiger nordischen Os- und Sandpflanzen on the distribution, ecology and sociology of the plants of eskers and sandy areas of northern Europe. From 1961, he worked at the University of Helsinki as an Assistant Professor of Botany until 1971 when he was promoted to professor extraordinary (associate professor) and in 1976 to Professor of Plant Systematics, Morpholoy and Phytogeography. In 1978–1983, he was the director of the Department of Botany, the Botanical Garden and the Botanical Museum. He retired in 1984. He did much research work on taxonomy and the geographic distribution of plants. He was regional adviser for Finland to the Flora Europaea project, and became co-chairman of the mapping project for European vascular plants Atlas Florae Europaeae. He was a founding member of OPTIMA (the Organization for the Phyto-Taxonomic Investigation of the Mediterranean Area). He was also interested in the economic botany and flora of the Fennoscandia, and he contributed greatly to the knowledge of Finnish flora. He was also specialised in the study of Caryophyllaceae and the genus Thymus, a matter which occupied a long period of his professional life. His studies on Thymus remain as a work of reference on the subject. He died at his home in Helsinki on 1 December 1999.

Some publications 1949. Tellima grandiflora (Pursh) Dougl. found naturalized in Finland 1948. Eastern forms of Thymus pulegioides L. in the Flora of Fennoscandia.

Atlas Florae Europaeae Jalas, J. & Suominen, J. (ed.) 1972: Atlas Florae Europaeae. 1. Pteridophyta (Psilotaceae to Azollaceae). - 121 pp . Helsinki. Jalas, J. & Suominen, J. (ed.) 1973: Atlas Florae Europaeae. 2. Gymnospermae (Pinaceae to Ephedraceae). - 40 pp. Helsinki. Jalas, J. & Suominen, J. (ed.) 1976: Atlas Florae Europaeae. 3. Salicaceae to Balanophoraceae. - 128 pp. Helsinki. Jalas, J. & Suominen, J. (ed.) 1979: Atlas Florae Europaeae. 4. Polygonaceae. - 71 pp. Helsinki. Jalas, J. & Suominen, J. (ed.) 1980: Atlas Florae Europaeae. 5. Chenopodiaceae to Basellaceae. - 119 pp. Helsinki. Jalas, J. 1983: Atlas Florae Europaeae notes. L. New nomenclatural combinations in Alsinoideae and Paronychioideae (Caryophyllaceae). - Ann. Bot. Fennici 20: 109-111. Jalas, J. & Suominen, J. (ed.) 1983: Atlas Florae Europaeae. 6. Caryophyllaceae (Alsinoideae and Paronychioideae). - 176 pp. Helsinki. Jalas, J. 1985: Atlas Florae Europaeae notes. 5. New nomenclatural combinations in Dianthus and Aconitum. - Ann. Bot. Fennici 22: 219-221. Jalas, J. & Suominen, J. (ed.) 1986: Atlas Florae Europaeae. 7. Caryophyllaceae (Silenoideae). - 229 pp. Helsinki. Jalas, J. 1988: Atlas Florae Europaeae notes. 9-11. Ranunculaceae. - Ann. Bot. Fennici 20: 109-111. Jalas, J. & Suominen, J. (ed.) 1988: Atlas Florae Europaeae. I-III. - Published as a facsimile compendium of Atlas Florae Europaeae 1-7 (1972–86). Cambridge. Jalas, J. & Suominen, J. (ed.) 1989: Atlas Florae Europaeae. 8. Nymphaeaceae to Ranunculaceae. - 261 pp. Helsinki. Jalas, J. & Suominen, J. (ed.) 1991: Atlas Florae Europaeae. 9. Paeoniaceae to Capparaceae. - 110 pp. Helsinki. Jalas, J. & Suominen, J. (ed.) 1994: Atlas Florae Europaeae. 10. Cruciferae (Sisymbrium to Aubrieta). - 224 pp. Helsinki. Jalas, J. 1996: Atlas Florae Europaeae notes. 13. Suggestions on Alyssum and Lepidium (Cruciferae). - Ann. Bot. Fennici 33: 283-284. Jalas, J., Suominen, J. & Lampinen, R. (ed.) 1996: Atlas Florae Europaeae. 11. Cruciferae (Ricotia to Raphanus). - 310 pp. Helsinki. Jalas, J., Suominen, J., Lampinen, R. & Kurtto, A. (ed.) 1999: Atlas Florae Europaeae. 12. Resedaceae to Platanaceae. - 250 pp. Helsinki.

References

Worked examples

Example 1 — a first encounter with Jaakko Jalas

Start with the simplest possible case. Write down what Jaakko Jalas 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 Jaakko Jalas 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 Jaakko Jalas 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 Jaakko Jalas

In research: Jaakko Jalas 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 Jaakko Jalas 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: Jaakko Jalas is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1920 births, 1999 deaths, 20th-century Finnish botanists, so understanding it makes those chapters shorter.
In everyday life: Look for Jaakko Jalas 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 Jaakko Jalas in 20 minutes

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

Frequently asked questions

What is Jaakko Jalas in simple terms?

Arvo Jaakko Juhani Jalas (7 May 1920 – 1 December 1999) was a Finnish botanist. He worked in the University of Helsinki.

Why does Jaakko Jalas 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 Jaakko Jalas?

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 Jaakko Jalas.