A methodological approach to evaluating horizontal and vertical integration in agriculture in Eastern Europe and the Soviet Union with an application to Bulgaria
Agriculture ; Agro-industrie ; Bulgarie ; Concentration d'entreprises ; Concentration verticale ; Europe ; Europe de l'Est ; Evaluation ; Géographie de l'Europe ; Rendement agricole ; URSS
Vertical distribution of human and animal populations in north-central Ethiopia
The great concentration of human population between 2 600-2 800 m above sea level in this part of Ethiopia suggests the availability of flat and ondulating topography at that altitude. Cattle are also found more at these elevations; lower altitudes
Vertical dispersion of dust particles in a turbulent boundary layer
is the main mechanism for ejection of dust particles. Vertical mean dust concentrations for pure dust and 2 mixtures of dust and saltating glass particles were determined and analysed. Presentation and discussion of the results.
The flow of glass dust particles in air was investigated experimentally over a flat bed in a wind tunnel. Particle concentrations were measured by light scattering diffusion (LSD) and digital image processing. It was verified that saltation
Industry description and trends in structure. Concentration in food processing. Increasing diversification, conglomeration and vertical integration. Impacts of changing structure of the industry. Policies regarding structure of the industry. (INRA).
A series of vertical alluvial profiles from the upper River Severn floodplain at Welshpool ranging in age from Late Pleistocene to the present have been examined for their Ni, Cu, Zn, Cd, Ba and Pb concentrations. These profiles have been variably
polluted by metalliferous mining activity in the 19th century. The data are used to establish whether vertical increases in concentrations can be used to indicate a youging-upwards of the sediments. The data show that grain size and organic content do
Rates of erosion and topographic evolution of the Sierra Nevada, California, inferred from cosmogenic Al 26 and Be 10 concentrations
California ; Datation isotopique ; Erosion fluviatile ; Etats-Unis ; Evolution du relief ; Géomorphologie ; Montagne ; Mouvement vertical ; Paléogéomorphologie ; Sierra Nevada ; Tectonique ; Topographie ; Variation climatique
California ; Climatic variation ; Fluvial erosion ; Geomorphology ; Isotope dating ; Landform evolution ; Mountain ; Palaeogeomorphology ; Sierra Nevada ; Tectonics ; Topography ; United States of America ; Vertical movement
The AA. dated caves in canyon walls, Sierra Nevada, using Al 26/Be 10 dating to document rates of river incision into bedrock, a primary means by which landscapes respond to tectonic forcing. They also measured nuclide concentrations in bare bedrock
A vertical exchange model for coarse bedload movement : numerical considerations in Geomorphological models. Theoretical and empirical aspects.
The system described is dependent on the relative concentration of the coarse tracer particles in the surface and subsurface layers of the channel bed, the depth of scour, and the rates of exposure and burial. The concepts involved agree well
L'accent est mis sur la relation entre la concentration spatiale de la production et l'intégration verticale, basée sur l'hypothèse que l'agglomération spatiale des entreprises dans une même branche facilite l'approvisionnement en facteurs de
in groundwater, in areas contaminated by tailings deposits. Vertical trends in concentrations of metals show that they are distributed based on apportionment of metal phases between reducing oxidizing environments and pH fluctuations.
Sites were established where sediments and water throughout the stratigraphic section were collected and analyzed. Chemical analyses indicate enriched concentrations of cadmium, copper, manganese, and zinc in sediments and porewater, and arsenic
The vertical and horizontal expansions of China's city system
L'A. montre que les facteurs institutionnels ont joué un rôle clé dans la formation du système urbain chinois, caractérisé par une baisse de la concentration de la population parmi les villes, et par d'importantes expansions verticales (croissance
Afghanistan ; Asie ; Cours d'eau ; Cénozoïque ; Fluviatile ; Géomorphodynamique ; Himalaya ; Mouvement vertical ; Profil longitudinal ; Réseau de drainage ; Tectonique de plaques ; Tibet
Afghanistan ; Asia ; Cenozoic ; Drainage network ; Earth surface processes ; Fluvial processes ; Himalaya ; Longitudinal section ; Plate tectonics ; Stream ; Tibet ; Vertical movement
This paper describes the southward-draining systems of Afghanistan, of Tibet and southeast Asia, and of the Himalaya and southern Tibet, and concentrates on base levels of erosion, recent river gradients and the response to tectonic, climatic
De nombreuses méthodes utilisées pour prévoir la concentration des effluents à partir d'une source ponctuelle font appel aux paramètres de diffusion y et z. Plusieurs techniques permettent de les déterminer. De longues séries d'observations et de
de l'atmosphère sur le plan vertical. (J.P. Besancenot).
The concentration of cosmogenic nuclides in rocks exposed at the Earth's surface is proportional to the total duration of their exposure. This is the basis for bedrock surface exposure dating and has been used to constrain valley lowering rates
Dispersion atmosphérique, concentrations polliniques et prévention des allergies
La quantité de pollen présente chaque jour dans l'air respiré dépend des qualités dispersives de l'atmosphère (vent, brassage vertical...). Sur l'exemple de la région parisienne, les AA. proposent un indice de dispersion atmosphérique, dont les
valeurs élevées sont bien associées à de fortes concentrations polliniques pour les taxons testés. Ces résultats pourraient déboucher sur des prévisions biométéorologiques. - (JPB)
This study concerns sand deposition within a regular array of vertical cylinders placed in the path of a sand-laden wind. 12 wind tunnel experiments using 3 preselected shear velocities, with associated rates of sand feed, and 4 roughness element
concentrations were carried out to evaluate the factors that affect sand deposition and sand flux in the presence of immobile rough elements. The sand deposition and sand flux along an array consisting of regularly distributed, non erodible elements were shown
The A. investigates the applicability of granulometric indices for the reconstruction of past environments. This paper concentrates primarily on the study of variation in the vertical profile of deposits. Along with other indices, fineness grade
The AA. concentrate upon recognition of individual reef units within the late Pleistocene Makatea limestones, and dating of corals from them by U-series disequilibrium dating. They demonstrate variability in the elevation of contemporaneous reefs
Acier ; Concentration d'entreprise ; Division internationale du travail ; Entreprise multinationale ; Fer ; Géographie humaine ; Industrie ; Industrie extractive ; Mine ; Ressources minières ; Restructuration industrielle ; Sidérurgie
In the post 1950 period there was a significant regional restructuring of the international iron ore industry. Major steel firms moved to capture regions either in vertically integrated corporate structures or through long-term contract and pricing