Complex Magnetic Permeability of Packed Metal Powders

Compacting of Metal Powders

Applicability study of classical and contemporary models for effective complex permittivity of metal powders.

Microwave thermal processing of metal powders has recently been a topic of a substantial interest; however, experimental data on the physical properties of mixtures involving metal particles are often unavailable. In this paper, we perform a systematic analysis of classical and contemporary models of complex permittivity of mixtures and discuss the use of these models for determining effective ...

Calculating Magnetic Permeability Response of a Conducting Square Ring Structure

In the present work, we investigate the tunability of the magnetic response of a new structure. A lattice of periodically arranged close-packed square conducting rings has been studied for this purpose. Here, instead of enhancing the magnetic activity via resonance, like in split-ring resonators, we concentrate on the analysis of the interactions between these rings. The core idea is to design ...

Permeability of Graft-Polymerized Polyvinylpyrrolidone-Silica Resin in Packed Columns

The effect of solvent power and flow rate on the permeability of a size exclusion chromatography (SEC) column packed with a novel polyvinylpyrrolidone (PVP)-grafted porous silica resin was studied. The PVP-silica resin was prepared from a porous silica size exclusion resin onto which a terminally anchored PVP layer was graft polymerized. The terminally anchored PVP layer was synthesized via a f...

Complex microwave conductivity of Na - DNA powders

We report the complex microwave conductivity, σ = σ 1 − iσ 2 , of Na-DNA powders, which was measured from 80 K to 300 K by using a microwave cavity perturbation technique. We found that the magnitude of σ 1 near room temperature was much larger than the contribution of the surrounding water molecules, and that the decrease of σ 1 with decreasing temperature was sufficiently stronger than that o...