scholarly journals The research of Korean traditional elementary textbooks - Focusing on the analysis of character species -

2016 ◽  
Vol 67 (null) ◽  
pp. 25-47
Author(s):  
Jeong Yon Sil
Keyword(s):  
Character Species ◽  
Elementary Textbooks

Vegetation of the southern part of Bolshevik Island (Severnaya Zemlya Archipelago)

2006 ◽  
pp. 3-87 ◽  
Author(s):  
N. V. Matveyeva
Keyword(s):  
Coastal Plain ◽  
Great Majority ◽  
Wide Distribution ◽  
Tundra Zone ◽  
Polar Desert ◽  
Character Species ◽  
Severnaya Zemlya ◽  
Severnaya Zemlya Archipelago ◽  
Desert Zone ◽  
Ecological Range

Bolshevik Isl. is the one of the largest islands within the Severnaya Zemlya archipelago. It is situated in the southern part of the polar desert zone. In the course of three field work trips in 1997, 1998 and 2000 years 252 relevees were made in its southern part on three geomorphologic surfaces: coastal plain, inner upland close to glacier and ancient high river terraces. As the result 27 syntaxonomical units of different rank (15 associations, 2 subassociations, 2 variants, and 8 community types) were described using Braun-Blanquet approach. All syntaxa, except one, are new and mostly similar to communities described on Franz Josef Land. The problems were to put new syntaxa into the higher level units (including class) within the syntaxonomical hierarchy. The main bulk of syntaxa, both zonal and intrazonal ones, has to be preliminary placed into Salicetea herbaceae class although there is a lot of reasons to consider zonal syntaxa as a new class that is specific for the polar desert zone. In any case, there are no one syntaxon that can be referred to Loiseleurio-Vaccinietea class that combines zonal vegetation in the tundra zone. The wide ecological range of great majority of species as well as the changes of their intralandscape distribution compare to the tundra zone made additional difficulties in finding character and differential species. 340 species (vascular plants — 52, mosses — 97, liverworts — 41, lichens — 150), that compiles 73 % of the whole island flora and 84 % of its southern part, were recorded within the all relevees. Almost half of these (182) are very rare on the island and 127 species were met 1—2 times. There are 70 species with wide ecological range throughout all landscape types with such commonly distributed herbs as Saxifraga cernua, S. hyperborea and Stellaria ed­ward­sii, mosses Polytrichastrum alpinum and Sanionia uncinata and lichen Stereocaulon rivulorum among these. Phippsia algida, the character species for snow bed communities, occurs in about 70 % of syntaxa. Useful for differentiation of syntaxa have been appeared 87 species. Few species with wide distribution within a landscape demonstrate their preference to a certain syntaxon by higher abundance (preferential character species). These are mostly bryophytes: mosses Bryum cryophilum and Grimmia torquata, and liver­worts Gymnomitrion corallioides, Marsupella arctica and Scapania crassiretis. Cryptogam species predo­minate in the whole flora as well as in each syntaxon. The number of species varies from 12 to 70 per sample plots 5÷5 m and from 20 to 195 in different syntaxa. The richest in species (70 per community and about 190 for association) are zonal plant communities on the accumulative coastal plain in the region of Sol­nechnaya Bay, the poorest one, with 10 and 20 species consequently, is ass. Hygrohypno polari—Saxifragetosum hyperboreae that was described on the upland, close to glacier in the inner part of island.

scholarly journals XX.—On Dimethyl-Thetine and its Derivatives

1878 ◽  
Vol 28 (2) ◽  
pp. 571-582 ◽  
Author(s):  
Crum Brown ◽  
E. A. Letts
Keyword(s):  
Low Temperature ◽  
The Other ◽  
Similar Relation ◽  
The One ◽  
Elementary Textbooks

The analogies existing between elements belonging to one “family,” such, for instance, as the nitrogen family or the sulphur family, have long been recognised, and are pointed out and insisted upon even in elementary textbooks; but the very important analogies existing between substances of different quantivalence are apt to be forgotten or overlooked. For illustrations of such analogies we may point to boron and silicon, elements closely resembling one another in themselves and also in their compounds,—differing, indeed, in little else but that the one is triad and the other tetrad. A similar relation exists between gold and platinum.The elementary substances, sulphur and phosphorus, have many points of similarity: both fuse at a comparatively low temperature, both are transformed by heat into amorphous insoluble modifications, and both have anomalous vapour densities.

Evaluation of Elementary Textbooks

1971 ◽  
Vol 78 (2) ◽  
pp. 189-191
Author(s):  
C. B. Allendoerfer
Keyword(s):  
Elementary Textbooks

Generating patterns from transformations

1977 ◽  
Vol 24 (3) ◽  
pp. 191-195
Author(s):  
Martin L. Johnson
Keyword(s):  
Classroom Teachers ◽  
Curriculum Guides ◽  
Teachers And Students ◽  
Elementary Textbooks ◽  
Transformational Geometry

Many current elementary textbooks and curriculum guides are placing increasing emphasis on the teaching of transformational geometry. This topic, however, is still relatively unfamiliar to many classroom teachers, and ways of helping teachers and students acquire a “feel” for simple, basic transformations are needed.

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