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Morphological and Physical Characteristics of Soils Developed on a Toposequence Derived from Coarse-grained Pegmatites in a Tropical Region, Delta State, Nigeria

Egbuchua, C. N. - In: Asian Journal of Agriculture and rural Development 4 (2014) 5, pp. 313-323

A study was conducted to evaluate the morphological and physical characteristics of a soil devel-oped on a toposequence using fire slope positions. Modal profile pits were dug in each of the slope positions and characterized. Soil samples were collected from each of the pedogenetic horizons and...

Persistent link: https://www.econbiz.de/10011071001

Morphological and Physical Characteristics of Soils Developed on a Toposequence Derived from Coarse-grained Pegmatites in a Tropical Region, Delta State, Nigeria

Egbuchua, C.N. - In: Asian Journal of Agriculture and Rural Development 04 (2014) 05

Persistent link: https://www.econbiz.de/10011200703

Effective boundary forces for several geometries in dissipative particle dynamics

Colmenares, Pedro J.; Rousse, Roberto - In: Physica A: Statistical Mechanics and its Applications 367 (2006) C, pp. 93-105

This paper derives the effective force between particles in the framework of dissipative particle dynamics (DPD) by using the formalism discussed by Revenga et al. [Int. J. Mod. Phys. C 9 (1998) 1319]. In order to mimic realistic systems, we obtained explicit expressions for the effective...

Persistent link: https://www.econbiz.de/10010590491

A stochastic Trotter integration scheme for dissipative particle dynamics

Serrano, M.; De Fabritiis, G.; Español, P.; Coveney, P.V. - In: Mathematics and Computers in Simulation (MATCOM) 72 (2006) 2, pp. 190-194

In this article we show in detail the derivation of an integration scheme for the dissipative particle dynamic model (DPD) using the stochastic Trotter formula [G. De Fabritiis, M. Serrano, P. Español, P.V. Coveney, Phys. A 361 (2006) 429]. We explain some subtleties due to the stochastic...

Persistent link: https://www.econbiz.de/10011051081

Efficient numerical integrators for stochastic models

De Fabritiis, G.; Serrano, M.; Español, P.; Coveney, P.V. - In: Physica A: Statistical Mechanics and its Applications 361 (2006) 2, pp. 429-440

The efficient simulation of models defined in terms of stochastic differential equations (SDEs) depends critically on an efficient integration scheme. In this article, we investigate under which conditions the integration schemes for general SDEs can be derived using the Trotter expansion. It...

Persistent link: https://www.econbiz.de/10011061635

Modeling viscoelastic flow with discrete methods

Somfai, Ellák; Morozov, Alexander N.; van Saarloos, Wim - In: Physica A: Statistical Mechanics and its Applications 362 (2006) 1, pp. 93-97

The hydrodynamics of viscoelastic materials (for example, polymer melts and solutions) presents interesting and complex phenomena, for example, instabilities and turbulent flow at very low Reynolds numbers due to normal stress effects and the existence of a finite stress relaxation time. This...

Persistent link: https://www.econbiz.de/10011062743

Tumbling, stretching and cross-stream migration of polymers in rectilinear shear flow from dissipative particle dynamics simulations

Danioko, Sidy; Laradji, Mohamed - In: Physica A: Statistical Mechanics and its Applications 391 (2012) 12, pp. 3379-3391

Solutions of flexible polymer chains with harmonic bonds undergoing rectilinear flow in slit pores are investigated via dissipative particle dynamics (DPD) simulations. We found that when DPD with low Schmidt number (Sc∼1) is used, the polymer chains tend to migrate across the streamlines...

Persistent link: https://www.econbiz.de/10011064383