نتایج جستجو برای: relative permittivity

تعداد نتایج: 393013  

2000
Kailash P. Thakur

A three dimensional vector finite element method (FEM) has been used to model the permittivity of rice using the scattered far field radiation. Scattering of incident plane wave radiation is analysed to extract the permittivity of granular material. Some reduced parameters obtained from the scattered electric field show a very good correlation with the permittivity of materials (both dielectric...

2015
D H Gadani A D Vyas

A dielectric mixing model has been developed to calculate the complex permittivity of wet soils at 5.65 GHz (C-band) and 9.5 GHz (X-band) microwave frequencies. The model considers the complex permittivity of dry soil as initial parameter. The complex permittivity of wet soil has been estimated in terms of the complex permittivity of dry soil, the complex permittivity of water at a given microw...

2015
Congwei Xie Artem R. Oganov Dong Dong Ning Liu Duan Li Tekalign Terfa Debela

Techniques for rapid design of dielectric materials with appropriate permittivity for many important technological applications are urgently needed. It is found that functional structure blocks (FSBs) are helpful in rational design of inorganic dielectrics with expected permittivity. To achieve this, coordination polyhedra are parameterized as FSBs and a simple empirical model to evaluate permi...

2009
Peter Scharff Andrea Schneider Christian Weigel Helge Drumm S. V. Drobot

A technique of determination of complex permittivity and permeability of ferrimagnetic nanopowders using S-parameter measurements in rectangular waveguide and results of its study are presented in this paper. The permittivity and permeability of the ferrimagnetic nanopowders are determined by the novel technique in which magnitudes of S-parameters are used only. Use of the technique allows to s...

Journal: :Optics letters 2008
Ranjan Singh Abul K Azad John F O'Hara Antoinette J Taylor Weili Zhang

We investigate the effect of metal permittivity on resonant transmission of metamaterials by terahertz time-domain spectroscopy. Our experimental results on double split-ring resonators made from different metals confirm the recent numerical simulations [Phys. Rev. E 65, 036622 (2002)] that metamaterials exhibit permittivity-dependent resonant properties. In the terahertz regime, the measured i...

Journal: :polyolefins journal 0
alireza nikfarjam department of mems&nems, faculty of new sciences and technologies, university of tehran, p.o.box:14395-1561, tehran, iran roham rafiee composites research laboratory, faculty of new sciences and technologies, university of tehran, tehran 1439955941 iran mostafa taheri composites research laboratory, faculty of new sciences and technologies, university of tehran, tehran 1439955941 iran

isolated carbon nanotubes (cnts), cnt films and cnt-polymer nanocomposites are a new generation of materials with outstanding mechanical, thermal, electrical and electromagnetic properties. the main objective of this article is to provide a comprehensive review on the investigations performed in the field of characterizing electrical and electromagnetic properties of isolated cnts and cnt-reinf...

2013
Hanita Daud Hasnah Mohd Zaid Muhammad Kashif Nadeem Nasir

This is our initial response towards fabricating a magnetic filled polymer composite samples potentially used as electromagnetic waves detector. Samples of lanthanum yttrium iron garnet Y3.0-XLaXFe5O12 (where x = 0, 0.5 ,1.0, 1.5 , 2.0, 2.5, 3.0 ) were synthesized by conventional solid state technique. We used simple casting technique to fabricate the Y3.0XLaXFe5O12-PVA composite. The samples w...

Journal: :Journal of pharmaceutical sciences 2011
Pei-Fang Sung Yi-Ling Hsieh Kristen Angonese Don Dunn Ray J King Rachel Machbitz Andrew Christianson William J Chappell Lynne S Taylor Michael T Harris

The real (ε') and imaginary (ε″) components of the complex permittivity of anhydrous lactose and microcrystalline cellulose (MCC) under different bulk densities, moisture contents (MCs), and times of hydration (for anhydrous lactose) were measured nondestructively using a microwave resonator sensor operating in the range of 700-800 MHz. Measurements of sensor resonant frequency and conductance ...

2016
Brian Edwards Andrea Alù M. G. Silveirinha Nader Engheta B. Edwards A. Alù N. Engheta

Following our recent theoretical and experimental results that show how zero-permittivity metamaterials may provide anomalous tunneling and energy squeezing through ultranarrow waveguide channels, here we report an experimental investigation of the bending features relative to this counterintuitive resonant effect. We generate the required effectively zero permittivity using a waveguide operati...

2001
C. León P. Lunkenheimer K. L. Ngai

Electrical relaxation data of crystalline yttria-stabilized zirconia are used to analyze the permittivity change observed in the spectra of the real part of the permittivity in ionic conducting materials. It is found that this permittivity change is independent of both temperature and mobile-ion concentration, and it is determined solely by the degree of interaction among ions in the relaxation...

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