نتایج جستجو برای: terrace
تعداد نتایج: 1785 فیلتر نتایج به سال:
Introduction: Flank terraces are topographically subtle, laterally extensive structures on the flanks of several large Martian volcanoes [1]. The origin of terraces has been ascribed to several mechanisms, including elastic self-loading [2], lithospheric flexure [3], gravitational spreading [4], magma chamber tumes-cence [5], and shallow slumping [6]. Here we summa-rise the results of our work ...
This paper applies statistical and geostatistical procedures to a soil chronosequence on the Ž . terraces of the Henares River NE Madrid to analyse the spatial distribution of several soil properties and use the contribution of geostatistics to establishing a landscape evolution model of the area. Particle-size distribution, pH, calcium carbonate and organic carbon were analysed. Statistical pr...
Effect of an anisotropic detachment on a heteroepitaxial island shape is studied by means of a kinetic Monte Carlo simulation of a square lattice gas model. Only with molecular deposition followed by surface diffusion, islands grow in a ramified dendritic shape, similar to DLA. Introduction of molecular detachment from edges makes islands compact. To understand an anisotropic island shape obser...
We study a minimal stochastic model of step bunching during growth on a one-dimensional vicinal surface. The formation of bunches is controlled by the preferential attachment of atoms to descending steps (inverse Ehrlich-Schwoebel effect) and the ratio d of the attachment rate to the terrace diffusion coefficient. For generic parameters (d>0) the model exhibits a very slow crossover to a nontri...
Using an STMJHREELS system, we have investigated the relationship between the surface morphology and vibrational modes of C60 adsorbed on Cu(l11). At 300K, CGO is mobile on the Cu(ll1) terrace, but is more strongly bound at the step edge. Therefore, any C60 which adsorbs on the terrace will migrate to the step edge where it is immobilized. Thus for very low coverages, the ChO preferentially ads...
Terraces are traditional engineered ecosystems that affect the hydro-geological equilibrium, slope stability, and local communities. The aims of this paper are (i) identifying environmental factors that affect terrace stability in the Amalfi Coast, (ii) defining agriculturalists' observations on environmental changes within that system and (iii) exploring potentiality of these observations to b...
We calculate an analytical expression for the terrace-width distribution P(s) for an interacting step system with nearest- and next-nearest-neighbor interactions. Our model is derived by mapping the step system onto a statistically equivalent one-dimensional system of classical particles. The validity of the model is tested with several numerical simulations and experimental results. We explore...
Fallow management is a common practice of traditional shifting cultivation in Southeast Asia and it survives throughout the region for many centuries (Spencer 1966). The systems are often found among the ethnic minorities in the region but governments, on the other hand, see the system as a primitive form of agricultural production, destruction to the forests and watersheds, wasteful and unprod...
Pyramid-like Si structures have been observed on large (5 μm) atomically flat terraces of the step bunched Si (111)-(7×7) surface during Si deposition at T = 600°–760°C in the ultrahighvacuum reflection electron microscope (UHV REM). Such structures are the result of sequential twodimensional island nucleation and growth (2DNG) accompanied by reducing a terrace width after each monolayer format...
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