Showing papers by "University of Patras published in 1969"

Représentations des enfants de 10 ans sur le concept de lumière: perspectives piagétiennes

Abstract: Les enfants construisent de representations des concepts et des phenomenes physiques et ces representations jouent un role decisif a l’enseignement. Pour le physicien, la lumiere est une entite distincte dans l’espace, independante des sources qui la produisent et des effets qu’elle provoque pendant sa propagation. Dans plusieurs recherches centrees sur les representations de la lumiere que se font les enfants de 5 a 15 ans on trouve que ces representations sont souvent incompatibles au modele scientifique. Cent trente-deux enfants (66 filles et 66 garcons) ont participe a cette recherche ou on etudie les representations des enfants de dix ans sur la lumiere dans une perspective piagetienne. Comme technique de la recherche on a choisi l’entretien individuel directif. Les resultats de la recherche montrent que les enfants des dix ans, utilisent differentes categories des representations pour la lumiere, dominees pour la majorite par la pensee preoperatoire dans une perspective piagetienne.

Studies on the flora and vegetation of the Ormos Archangelou in Rhodos Island

Abstract: Ormos Archangelou or Tsambica Bay is located at about 28 km southwest of the town Rhodos. There can be distinguished two types of Vegetation: a. the evergreen sclerophyll shrubby formation of “Macchia” with its typical Association Erica verticillata-Arbutus unedo, and b. the xeromorphous low shrubby formation of “Phrygana” with its corresponding Association Poterium spinosum-Coridothymus capitatus. The first type of Vegetation, which occupies a small part of the area, can be considered as an anthropogeneous undergrowth in the shrubby degradation stage of the forests which covered Rhodos Island in older times. The many solitary old trees of Pinus brutia, Cupressus sempervirens f. horizontalis, Quercus aegilops, Quercus coccifera, and others, which are growing on open areas of the island, may be considered as most characteristic indications of this hypothesis. Sociological data concerning this type of Vegetation are given in Tables I–II. The second type of Vegetation is the most xeromorphic plant formation of the Aegean Island, consisting mainly of low xeromorphic shrubs, 0.50–0.70 m high. This is physiognomically the most distinctive vegetation type of calcareous rocky lands of the Aegean Islands. It covers most of the area and extends particularly on slippery rocky slopes, on very dry hills, on soils composed mainly of pebbles and cobbles, along the borders of Macchia Vegetation, and to a great extent in large patches among xerophilous Macchia. Sociological data concerning this type of Vegetation are given in Table III.