Effective medium theories for irregular fluffy structures: aggregation of small particles

Effective medium theories for irregular fluffy structures: aggregation of small particles.

The extinction efficiencies as well as the scattering properties of particles of different porosity are studied. Calculations are performed for porous pseudospheres with small size (Rayleigh) inclusions using the discrete dipole approximation. Five refractive indices of materials covering the range from 1.20+0.00i to 1.75+0.58i were selected. They correspond to biological particles, dirty ice, ...

Preferred structures in small particles

Morphological transformations of Au particles supported on SiO were observed by real-time high-resolution electron microscopy, and the data were analysed quantitatively to extract the relative probabilities of the different morphologies and compared with a probability model to understand the role of the different parameters that affect the transformations. The experimental data and probability ...

investigating the feasibility of a proposed model for geometric design of deployable arch structures

deployable scissor type structures are composed of the so-called scissor-like elements (sles), which are connected to each other at an intermediate point through a pivotal connection and allow them to be folded into a compact bundle for storage or transport. several sles are connected to each other in order to form units with regular polygonal plan views. the sides and radii of the polygons are...

Effective Medium Theories and Symmetry Properties of Elastic Metamaterials

Infinitely Definable Structures in Small Theories

We observe simple links between preorders, semi-groups, rings and categories (and between equivalence relations, groups, elds and groupoids), which are in nitely de nable in an arbitrary structure, and apply these observations to small structures. Recall that a structure is small if it has countably many pure n-types for each integer n. A category de ned by a pure n-type in a small structure is...