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Initial Permeability (initial + permeability)

Distribution by Scientific Domains
Chemistry60%
Polymers and Materials Science40%

Selected Abstracts

Super High Threshold Percolative Ferroelectric/Ferrimagnetic Composite Ceramics with Outstanding Permittivity and Initial Permeability,

ANGEWANDTE CHEMIE, Issue 12 2010
Hui Zheng
No abstract is available for this article. [source]

Super High Threshold Percolative Ferroelectric/Ferrimagnetic Composite Ceramics with Outstanding Permittivity and Initial Permeability,

ANGEWANDTE CHEMIE, Issue 47 2009
Hui Zheng
Hohe Hemmschwelle: Ferroelektrische/ferrimagnetische Verbundkeramiken mit Perkolationsschwellen von 0.85 bis 0.95 wurden durch einen Sol-Gel-Prozess erhalten, der die leitfähigen Ferritpartikel durch eine ferroelektrische Phase wie BaTiO3 ummantelt und voneinander separiert. Eine derart hohe Schwelle führt zu einem steilen Anstieg von Permittivität , und Anfangspermeabilität ,i bei steigendem Ferrit-Anteil (NZFO=Ni0.5Zn0.5Fe2O4). [source]

A Novel Percolative Ferromagnetic,Ferroelectric Composite with Significant Dielectric and Magnetic Properties,

ADVANCED MATERIALS, Issue 3 2007
Q. Huang
A series of BaTiO3,Ni0.55Zn0.45Fe2.03O4composites are synthesized. The composites exhibit excellent dielectric and magnetic properties in the neighborhood of the percolation threshold,a high dielectric constant that is nearly temperature and frequency independent (see figure),and considerable initial permeability with excellent frequency stability, and may be useful as a high-performance multifunction ceramic composite. [source]

Colloid-associated contaminant transport in porous media: 2.

AICHE JOURNAL, Issue 10 2002
Mathematical modeling
A comprehensive mathematical model developed describes the colloid-associated contaminant transport in groundwater flows based on equilibrium adsorption of contaminants, hydrodynamic release, migration, and capture of colloidal fines in groundwater flows. This model is more realistic than the existing models in that the physics of migration of colloidal fines is adequately incorporated. It also accounts for the entrapment and plugging of fine particles and, therefore, predicts both facilitation and retardation of the transport of contaminants depending on the flow and other conditions. The conditions leading to inhibition/retardation of contaminant transport due to plugging are: high release coefficient, low initial porosity, high inlet fines concentration, and high initial permeability. The mobilization and migration of colloidal fines, kaolin and their role on plugging, as well as on Ni2+ contaminant transport through kaolin-sand packed beds, were studied, and the model was tested with published experimental measurements, as well as with our laboratory column results. The plugging-based retardation of contaminant transport can be used to develop a new containment technique. [source]

Enhanced Permeability and Dielectric Constant of NiZn Ferrite Synthesized in Nanocrystalline Form by a Combustion Method

JOURNAL OF THE AMERICAN CERAMIC SOCIETY, Issue 5 2007
Sasanka Deka
The performance parameters of Ni0.5Zn0.5Fe2O4, synthesized in the nanocrystalline form by an autocombustion method, have been investigated. The sample sintered at 1200°C, with Bi2O3 as additive shows a very high value of initial permeability ,,i of >400 at 1 MHz, with low loss. Similarly, a very high dielectric constant is obtained at lower frequencies. The results show that optimum magnetic and electrical properties can be achieved for the NiZn ferrite nanocrystalline powders synthesized by the present autocombustion method and sintered at a relatively lower temperature of 1200°C when compared with a temperature of 1400°C required for the materials synthesized by the conventional ceramic method. [source]