The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The relative complex dielectric function epsiv*(omega)=epsiv' - jepsiv" of pulverized samples of different grade limestone (cement grade, chemical grade, steel melting soap (SMS) grade and dolomite), coal (lignite) and limestone-coal mixtures (65 wt% + 35 wt%) were measured at 10.1 GHz over a range of bulk densities from loosely to tightly packed. It is found that for these powdered samples,...
The science of microwaves owes its origin to the development of radar. Microwaves are part of electromagnetic spectrum. This field became vitally important as man reached out to space. Frequency range of these waves are from 3 GHz to 30 GHz. Microwaves have unique capabilities in remote sensing. The field of microwaves remote sensing has come to a stage of rapid growth. Microwaves can penetrate clouds...
A cavity perturbation technique is presented for measurement of dielectric constant and dielectric loss of the dielectric materials at X-band microwave frequency. A tunable rectangular cavity to operate in TE103 mode was designed and fabricated. Tunable cavity is calibrated to read its resonance frequency directly from the micrometer screw arrangement attached with the cavity. Shift in resonance frequency...
Dielectric study of allyl bromide, formamide and their binary mixtures have been carried out over the frequency range from 10 MHz to 20 GHz at temperatures 288 K, 298 K, 308 K and 318 K using Time Domain Reflectometry (TDR) for 11 different concentrations. Static dielectric constant, relaxation time, Kirkwood correlation factor, Excess parameters were estimated information regarding the molecular...
The importance of measuring the dielectric constant of a liquid lies in the fact that it provides valuable information about intermolecular interaction and dynamics of molecules at molecular levels. In Nitrobenzene (NB) and Chlorobenzene (CB) molecules the charge distribution is shielded and H-bonds do not appear where as in 2-Ethoxyethanol (2-EE) molecules the charge distribution is exposed. In pure...
The proposed nondestructive method is used for the accurate detection of complex permittivity and adulteration in petroleum liquid. The microstrip straight resonator is used to record the resonant frequency shift and Quality factor change for different percentages of ethanol in gasoline. The instrument prototype with the necessary GPIB interface and the network analyzer is used for the efficient and...
In this paper measurement of real part of permittivity and loss tangent of Zn1-x Mgx TiO3 (ZMT) ceramics in S-band of microwave frequencies is presented and the associated accuracy estimated. This approach is based on the measurement of transmitted power from the cavity at and off resonance. Details of the design and fabrication of the rectangular cavity and the input and output coupling are given...
The complex permittivity spectra of mixtures of methanol with 1-hexanol have been measured in the frequency range 10 MHz to 20 GHz using time domain reflectometry at different temperatures 288 K,298 K,308 K and 318 K respectively. The dielectric parameters such as static dielectric constant, relaxation time were obtained using the calibration method based on nonlinear least squares fit method. Using...
Complex permittivity spectra of mixtures of 1-heptanol and phenol over a range of concentration are obtained in the frequency range 30 MHz to 3.0 GHz using Vector Network Analyzer (VNA). Obtained complex permittivity data points at different frequencies were fitted into Debye model to evaluate dielectric relaxation parameters like, a relaxation time (tau), static permittivity (isin0) and permittivity...
Complex permittivity of 1-butanol and its mixtures with fluorobenzene over a range of concentration were obtained in the radio and lower microwave frequency range at constant temperature. Vector network analyzer (VNA) operating in the frequency range 0.03 MHz to 3.0 GHz was used to obtain complex permittivity spectra. Complex permittivity data points at different frequencies were fitted into Debye...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.