We propose a simple model for density fluctuations of aerodynamic grains, embedded in a turbulent, gravitating gas disc. The model combines a calculation for the behaviour of a group of grains encountering a single turbulent eddy, with a hierarchical approximation of the eddy statistics. This makes analytic predictions for a range of quantities including: distributions of grain densities, power...

We have studied the temperature dependence of low-field magnetoresistance and current-voltage characteristics of a low-angle bi-crystal grain boundary junction in perovskite manganite La2/3Sr1/3MnO3 thin film. By gradually trimming the junction we have been able to reveal the non-linear behavior of the latter. With the use of the relation MGB ∝ Mbulk √ MR we have extracted the grain boundary ma...

We study the dynamic electronic polarizability of a single nano-scale spherical metallic grain using a quantum mechanical approach. We introduce the model for interacting electrons bound in the grain allowing us numerically to calculate the frequency dependence of the polarizability of grains of different sizes. We show that within this model the main resonance peak corresponding to the surface...

A two dimensional cellular automata model has been developed to simulate and to study grain growth behavior during solidification and recrystallization processes, including predicting mechanical properties of metallic materials or investigating mechanical defects. Using the algorithm implemented, grain growth in model materials (nickel-based and titanium alloys) has been calculated in different...

Methanol lines observations of a sample of low mass Class 0 protostars are presented. Using a 1D radiative transfer model, I show that several protostars have large abundance jumps in the inner hot and dense region of envelopes, probably because of thermal grain mantle evaporation. These abundances are compared with a grain surface chemistry model.

The extrinsic grain boundary dislocations (EGBD's) in copper have been studied by transmission electron microscopy. It was shown that some EGBD's remain on grain boundaries after recrystallization and annealing at 0.6 T,, but not on those annealed at 0.8 T,. For several grain boundaries the crystallography of the defects was examined in detail and the dynamic theory of diffraction was used for ...

This paper presents an efficient solution for modeling checking graph transformation systems. The approach transforms AGG specifications into Bogor models and supports both attributed typed graphs and layered transformations. Resulting models are suitable for checking interesting properties expressed as combinations of LTL and graph transformation rules. The first experimental results are encou...

Experimental Design The trait of interest in our experiment is the proportion of the granule types. This is estimated from the granule size distribution using the two methods described in the main paper, namely the size threshold measure and mixture measure. The distribution of the granule size is obtained from a multi-phase experiment. Specifically, the experiment involved four phases: grain s...

Grain selection is an important process in single crystal turbine blades manufacturing. Selector structure is a control factor of grain selection, as well as directional solidification (DS). In this study, the grain selection and structure design of the spiral selector were investigated through experimentation and simulation. A heat transfer model and a 3D microstructure growth model were estab...

In order to improve the accuracy of grain production forecasting, this study proposed a new combination forecasting model, the model combined stepwise regression method with RBF neural network by assigning proper weights using inverse variance method. By comparing different criteria, the result indicates that the combination forecasting model is superior to other models. The performance of the ...