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Wyszukujesz frazę "environmental variables" wg kryterium: Temat


Wyświetlanie 1-2 z 2
Tytuł:
Not so individual after all: An ecological approach to age as an individual difference variable in a classroom
Autorzy:
Pfenninger, Simone E.
Powiązania:
https://bibliotekanauki.pl/articles/780659.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
age factor
context
environmental variables
young learners
individual difference
Opis:
The main goal of this paper is to analyze how the age factor behaves as an alleged individual difference (ID) variable in SLA by focusing on the influence that the learning context exerts on the dynamics of age of onset (AO). The results of several long-term classroom studies on age effects will be presented, in which I have empirically analyzed whether AO works similarly across settings and learners or whether it is influenced by characteristics of the setting and the learner—and if so, whether there are contextual variables that can help us understand why thoseoutcomes are different. Results of multilevel analyses indicate that macro-contextual factors (i.e., the wider school context) turn out to have a mediating effect on the relation between AO and L2 proficiency increase, exerting both positive and negative influences and thus suggesting that AO effects are malleable, which is what one would expect if we are dealing with an ID variable. In contrast, no such phenomenon can be observed in relation to lower contextual levels; learners within classes do not vary with regard to how sensitive they are to AO. Since the broader social environment in which learning takes place seems to be more influential than the cognitive state assumed to be a characteristic of the individual, I suggest that an ID model that assumes that age is a “fixed factor” (Ellis, 1994, p. 35) is not entirely satisfactory.
Źródło:
Studies in Second Language Learning and Teaching; 2017, 7, 1; 19-46
2083-5205
2084-1965
Pojawia się w:
Studies in Second Language Learning and Teaching
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cyanobacteria Dynamics in a Mediterranean Reservoir of the North East of Algeria: Vertical and Seasonal Variability
Autorzy:
Touati, Hassen
Guellati, Fatma Zohra
Arif, Salah
Bensouilah, Mourad
Powiązania:
https://bibliotekanauki.pl/articles/123568.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
cyanobacteria community
Zit-Emba reservoir
environmental variables
dynamics
Algeria
Opis:
Harmful cyanobacterial efflorescence is of growing global concern and its prediction and management require a better understanding of the growth control factors and dominance of cyanobacteria. The Zit-Emba reservoir located in the North-East of Algeria, was constructed to provide drinking water, irrigation, and fishing. The vertical and seasonal distribution variation of cyanobacteria community associated with environmental factors was comprehensively investigated from April 2016 to December 2016 at five depths, based on a seasonal sampling. The cyanobacteria communities of this reservoir are composed of seven genera belonging to five orders. The average proportion of Microcystis to total cyanobacteria population was 43%, followed by Woronichinia 21%, Planktothrix 16%, Dolichospermum 13%, Oscillatoria 5%, and the remainder (Merismopedia, Spirulina) 2%. The average cyanobacterial abundance was 2702 cells/mL, ranging from 360 to 65 795 cells/mL and this abundance exceeds the alert level 1 throughout the year. The most recurrent periods of increase took place from spring to summer and autumn. However, the vertical distributions of cyanobacteria displayed a similar profile each season, and abundances tended to decrease with depth. The results of the statistical analysis suggested that the most abundant of cyanobacterial genera were positively related to chlorophyll-a and water temperature and negatively with the concentrations of NO3-N, NH4-N, and NO2-N. This demonstration of toxigenic cyanobacteria in this drinking water production dam involves regular monitoring of the cyanobacterial communities and cyanotoxins in raw water.
Źródło:
Journal of Ecological Engineering; 2019, 20, 1; 93-107
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
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