Biogeomorphic model of dunefield activation and stabilization on the northern Great plains
A conceptual model is proposed for the activity of sand dune systems on the northern Great Plains that incorporates vegetation growth theory and geomorphic system theory. Dunefield activity is modeled as a cyclic phenomenon, alternating between
active and stable states, with the latter as the system state attractor. The model is divide into 2 constituents parts : the activation model is qualitative and describes the transition from stable to active dunes as the result of a climatic pertubation
such as drought that decreases vegetation cover; the stabilization model is quantitative and describes the transition from active to stable dunes using a logistic model of vegetation growth.
Moraines and late glacial activity in southern Varmland, southwestern Sweden
On the basis of ice-marginal formations in southern Värmland the dynamics of the Scandinavian inland ice during and after the Younger Dryas event are discussed. It is concluded that the ice sheet was two-centred. The activity from a centre
in the high-mountain area in southern Norway just reached into western Värmland. The activity from a centre over the Bothnian Bay, persisting through the Preboreal, approached the region north of Lake Vänern.
The Tyrnavos Fault is typical of many active normal faults in the Aegean region. This study illustrates how a combination of geological and geomorphological data is important in assessing the magnitude and timing of palaeoearthquake activity along
Active learning in geography and its practical management in schools in Geographical education.
This paper is founded on the conviction that active methods of learning are in most cases superior to didactic methods of teaching. Geography, by its very nature, is particularly well suited to the development of active learning methods
Contributions géographiques à l'étude de la population active du Plateau de Suceava
Années 1966-1977 ; Géographie de l'Europe ; Moldova ; Population active ; Roumanie ; Structure ; Suceava plateau
Analyse détaillée des changements intervenus dans la structure de la population active entre les recensements de 1966 et de 1977, reflétant le processus d'industrialisation et d'urbanisation rapide. (IS).
La population active dans le département des Bouches-du-Rhône
Bouches-du-Rhône ; Emploi ; France ; Géographie de l'Europe ; Population active ; Provence-Alpes-Côte d'Azur ; Secteur économique
Dans les Bouches-du-Rhône, on a recensé 45% des personnes actives résidant dans la région Provence-Alpes-Côte d'Azur. Une analyse plus fine est faite sur les structures d'emploi. (MW).
Population et population active d'ici 1985 et l'an 2000
(1986-2000) ; Belgique ; Géographie de l'Europe ; Population ; Population active ; Prévision
Dans le cadre des évolutions démographiques probables ainsi que de la population active, les AA. soulignent les répercussions que cette évolution peut avoir sur divers problèmes politiques, économiques et sociaux. (MED).
Recreation activities together with working and household activities are some of the most important actual expression for a normal style of living. To perform recreation activities, it is necessary to organize a specific environment. From the point
Measurement and empirical estimate of photosynthetically active radiation
By the result of measurement combined with theoretical analysis climatological estimate formulas for the photosynthetically active radiation energy and photo-quantum flux density of the direct and the global radiation are proposed by the AA.
Relatively low activities of the Hokkaido economy and regional development strategies
Some factors in the relatively low activity of the Hokkaido economy and regional development policies. The improvement of those factors, especially using the strategies for adding higher value to products of primary industry. - (SGA)
Which environmental factors determine recent cryoturbation and solifluction activity in a subarctic landscape? A comparison between active and inactive features
Environmental factors that affect the activity-inactivity variation of periglacial features may differ from those factors that control the distributional patterns of active features. To explore this potential difference, a statistically based
modelling approach and comprehensive data on active and inactive cryoturbation and solifluction features from a subarctic area of Finnish Lapland are investigated at a landscape scale. In the cryoturbation modelling, vegetation abundance is the most
important environmental variable explaining both the activity-inactivity variation and the distribution of active sites. The next most important variables are soil moisture and (micro)climatological conditions in the activity modelling, and slope angle
and ground material in the distribution modelling. For solifluction, the key variables determining the activity-inactivity variation are mean annual air temperature and mean maximum snow depth, whereas vegetation abundance and slope angle control
The impact of climate and weather on the activities of the building and construction industry in South Africa.
This study represents a quantitative survey of the impact of the climate and weather on the activities of the building and construction industry in South Africa. - (AJC)