This paper presents a general view of the nature of grain demand and utilization in the USSR and provides assessment of Soviet resources in terms of the prospects of resolving the grain problem. Special attention is given to the assessment
of climatic and technological resources and their impact on grain production increase. Based on these considerations, long-term and short-term projections of grain production are made, and the prospects of satisfying the need for grain are estimated
. The analysis indicates that exporting energy goods and importing grain is a more efficient way to balance grain supply and demand than to further increase investments in agriculture. (Ed.).
Chinese per capita grain output has been constantly higher than that of India, a fact which the author attributes to the greater natural resource endowment of China, the recycling of wastes and the higher processing factor for grain. (INRA).
Mesures de la taille des grains à partir d'échantillonnage du terrain. Signature de la texture des séries de dimensions des grains. Relation entre dimension des grains et texture des images. Cartographie des dimensions des grains.
Collisions of quartz grains with a sand bed : the influence of incident angle
This study supports a view of moving grain interaction with the bed in which saltation provides the power to mobilize grains but ripple growth is associated with reptation and particularly with a pattern of impact which develops with the bed relief
. Creep in more active on upwind facing slopes than at the crest, which therefore is a zone of net creep grain deposition.
A stochastic model for initial movement of sand grains by wind
A stochastic model for entrainment of sand grains by wind is presented through analysis of the forces exerted on a single spherical grain, coupled with fluctuations of wind velocity and the change in grain position on the surface, in order
to understand the probability of initial movement of sand grains by wind.
This study investigates how dust deposition samplers affect the grain size characteristics of the sediment they catch. Some particle fractions are collected more efficiency than others, resulting in a modification of the original grain size
distribution of the sediment. This paper presents wind tunnel results for 5 dust deposition samplers and 5 wind velocities. The catcher's effect on the grain size was apparent in all experiences.
Surface textures of intrafault quartz grains as an indicator of fault movement
Etude au microscope électronique de grains de quartz provenant des gouges qui accompagnent les failles. Ces grains de quartz sont formés à partir de cassures du quartz dans la roche-mère dues au mouvement tectonique, avec la corrosion par l'eau du
sol sur la surface des grains après le mouvement. La texture de surface des grains et leur morphologie peut être un bon indicateur du mode et du temps de fracture.
Aeolian deposition of dust over hills : the effect of dust grain size on the deposition pattern
Aeolian dust ; Aeolian features ; Aeolian transport ; Belgium ; Experimentation ; Flemish Brabant ; Grain size distribution ; Impact ; Leuven ; Topography
Wind tunnel experiments were conducted to investigate the effects of topography on the grain size characteristics of aeolian dust deposits. Experiments were performed on 3 isolated hills having various size and aspect ratios. The longitudinal
profile of the median grain diameter was investigated for each hill. The wind tunnel experiments show that the grain size characteristics of aeolian dust deposits are affected by topography.
Structural shifts in the world grain economy : 1962-1982. Production, trade, consumption
contribution yield or area increases have to grain production in the world's regions. Finally, perspectives of the future international grain trade will be evaluated.
Le trafic international des céréales en grains de l'Union Economique Belgo-Luxembourgeoise.
Renseignements concernant les différentes sortes de grains trafiquées. Le trafic et les grains sont principalement limités à la CEE. Une même étude a paru en néerlandais : Het internationaal verkeer van graangewassen in korrelvorm in de Belgisch
This paper focuses on the features of grain composition, based on data from various samples of debris flows in different regions and gullies, and their potential actions on debris flows. Samples are collected from gullies in Beijing, Gansu, Sichuan
The aims of this paper are therefore to 1) provide a review of the characteristics of the bed configuration in coarse-grained channels| 2) to distinguish between scales of bed roughness from velocity profile characteristics| and 3) to determine
Grain-size analysis by laser diffractometry : comparison with the sieve-pipette method
Clay mineral ; Grain size distribution ; Methodology ; Soil ; Soil properties ; Soil science ; X-ray diffraction analysis
Results of a traditional sedimentation technique for grain-size analysis (the sieve-pipette method) were compared with those of a laser diffraction grain-size analyser, the Coulter LS-100. Milled quartz samples and silty soil samples were used