نتایج جستجو برای: permittivity

تعداد نتایج: 5151  

Journal: :the modares journal of electrical engineering 2004
zahra atlasbaf kayvan forooraghi

in this paper two nodes to model isotropic and anisotropic media in transmission line matrix method (tlm) are presented. by using these two nodes, the permeability and permittivity of an anisotropic media can be modeled simultaneously. another application of these nodes is in modeling media with permittivity and permeability less than one. in the conventional 2 dimensional tlm, the stubs repres...

Journal: :Nature materials 2013
Wanbiao Hu Yun Liu Ray L Withers Terry J Frankcombe Lasse Norén Amanda Snashall Melanie Kitchin Paul Smith Bill Gong Hua Chen Jason Schiemer Frank Brink Jennifer Wong-Leung

The immense potential of colossal permittivity (CP) materials for use in modern microelectronics as well as for high-energy-density storage applications has propelled much recent research and development. Despite the discovery of several new classes of CP materials, the development of such materials with the required high performance is still a highly challenging task. Here, we propose a new el...

Journal: :iranian journal of biotechnology 2006
mohammad h. sarrafzadeh fredric bigey jean-marie navarro

recent technological improvements have extended the application range of dielectric permittivity biomass measurements to on-line monitoring of physiological changes during bacterial fermentations. in an industrial fermentation of bacillus thuringiensis, it is important to verify the intactness of bacterial plasmid content in all steps of culture. changes in certain plasmid resident properties o...

2012
G. Villares L. Begon-Lours C. Margo Y. Oussar J. Lucas S. Holé

The estimation of the permittivity distribution within a given volume by Electrical Capacitive Tomography relies on a relationship between the measured signal and the permittivity distribution, known as the sensitivity matrix. We show that relative permittivity variations must be lower than 25% to obtain errors smaller than 10% with the model whereas the permittivity can be scaled by up to 3.6 ...

Fredric Bigey Jean-Marie Navarro Mohammad H. Sarrafzadeh,

Recent technological improvements have extended the application range of dielectric permittivity biomass measurements to on-line monitoring of physiological changes during bacterial fermentations. In an industrial fermentation of Bacillus thuringiensis, it is important to verify the intactness of bacterial plasmid content in all steps of culture. Changes in certain plasmid resident properties o...

2007
Tom G. Mackay Akhlesh Lakhtakia

The electromagnetic properties of classical vacuum (i.e., empty space) are characterized by its permittivity ǫ0 = 8.854 × 10 −12 F m and permeability μ0 = 4π × 10 −7 H m. In contrast, anti–vacuum has permittivity −ǫ0 and permeability −μ0 [1]. The perfect lens, as conceptualized by Pendry [2], consists of a slab of anti–vacuum sandwiched by two slabs of vacuum. While this perfect lens is an idea...

There is a kind of composite materials made up of noble metal nanoparticles (such as gold, silver, copper) and a dielectric material (such as silica) with unique properties. In this paper, using Strong Permittivity Fluctuation Theory (SPFT) method, the coefficient of effective permittivity and the effective susceptibility coefficient are calculated for combining glass with metal nanoparticles, ...

2009
I. Stavrakas C. Anastasiadis

Marble beams were subjected to gradually increasing three-point bending from low loading levels up to levels that significant damage was observed. After each loading step the permittivity was measured at three characteristic locations: the tensional, middle and compressional zone of each sample. The permittivity measurements were conducted in the frequency range from 1kHz to 1MHz. The permittiv...

2004
I. Lebron D. A. Robinson

phases (solid, liquid, and gas) are known, especially if the model is to be used to predict water content or Measurement of soil dielectric properties, ε are widely used to porosity. The permittivity of air and water are well docuestimate water content in soils from remote sensing and from in situ soil sensors such as time domain reflectometry (TDR). The mineral mented (Lide, 1999). However, a ...

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