ELECTRICAL PROPERTIES OF MUNG BEANS (Vigna Radiata L.)

This paper contains the results of measuring the electrical properties of mung beans (Vigna radiata L.) set. The conductivity and relative permittivity are the main parameters of dielectric material electrical properties. The electrical properties of mung beans samples had not been sufficiently measured, and the aim of this work was to perform the measurements of these properties. Measurements were performed under variable moisture content and the frequency of electric field from 0.1 kHz till 200 kHz for conductivity and in the range from 1 MHz to 16 MHz for relative permittivity, using RLC meter and Q meter, respectively. It was concluded that relative permittivity, and conductivity increased with increase of moisture content, resistivity, impedance, loss tangent, and relative permittivity decreased as the frequency of electric field increased, respectively.

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Electrical Properties of Sunflower Achenes

Acta Technologica Agriculturae ◽

10.2478/ata-2014-0025 ◽

2014 ◽

Vol 17 (4) ◽

pp. 109-113 ◽

Cited By ~ 1

Author(s):

Ján Novák ◽

Ivan Vitázek

Keyword(s):

Dielectric Constant ◽

Electrical Properties ◽

Moisture Content ◽

Electric Field ◽

Loss Tangent ◽

Dielectric Heating ◽

Electrical Measurements ◽

Engineering Research ◽

Dielectric Constant And Loss ◽

Properties Of Materials

Abstract This work contains the results of measuring the electrical properties of sunflower achenes. The interest in electrical properties of biological materials resulted in engineering research in this field. The results of measurements are used for determining the moisture content, the surface level of liquid and grainy materials, for controlling the presence of pests in grain storage, for the quantitative determination of mechanical damage, in the application of dielectric heating, and in many other areas. Electrical measurements of these materials are of fundamental importance in relation to the analysis of quantity of absorbed water and dielectric heating characteristics. It is a well-known fact that electrical properties of materials, namely dielectric constant and conductivity, are affected by the moisture content of material. This fact is important for the design of many commercial moisturetesting instruments for agricultural products. The knowledge of dielectric properties of materials is necessary for the application of dielectric heating. The aim of this work was to measure conductivity, dielectric constant and loss tangent on samples of sunflower achenes, the electrical properties of which had not been sufficiently measured. Measurements were performed under variable moisture content and the frequency of electric field ranging from 1 MHz to 16 MHz, using a Q meter with coaxial probe. It was concluded that conductivity, dielectric constant and loss tangent increased with increasing moisture content, and dielectric constant and loss tangent decreased as the frequency of electric field increased.

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Electric Properties Measurement of Lentil

Acta Technologica Agriculturae ◽

10.2478/ata-2018-0004 ◽

2018 ◽

Vol 21 (1) ◽

pp. 18-23

Author(s):

Ján Novák

Keyword(s):

Dielectric Constant ◽

Electrical Properties ◽

Moisture Content ◽

Electric Field ◽

Loss Tangent ◽

Electric Properties ◽

Dielectric Heating ◽

Moisture Contents ◽

Dielectric Constant And Loss ◽

Coaxial Probe

AbstractThis paper contains the results of the electric properties measurement of lentil set. Electric measurements with use of these materials are of fundamental importance in relation to the analysis of quantity of absorbed water and dielectric heating characteristics. The aim of this paper was to perform the measurements of conductivity, dielectric constant and loss tangent on samples of lentil, the electrical properties of which had not been sufficiently measured. Measurements were performed under various moisture contents, and the frequency of electric field ranged from 1 MHz to 16 MHz, using a Q meter with coaxial probe. It was concluded that conductivity, relative permittivity and loss tangent increased with an increase in moisture content, and dielectric constant and loss tangent decreased as the frequency of electric field increased.

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Electrical Prope Rties of Popcorn Grains

Acta Technologica Agriculturae ◽

10.2478/ata-2013-0011 ◽

2013 ◽

Vol 16 (2) ◽

pp. 43-46

Author(s):

Ján Novák

Keyword(s):

Dielectric Constant ◽

Electrical Properties ◽

Moisture Content ◽

Electric Field ◽

Loss Tangent ◽

Dielectric Heating ◽

Electrical Measurements ◽

Engineering Research ◽

Dielectric Constant And Loss ◽

Properties Of Materials

Abstract This work contains the results of measuring the electrical properties of popcorn grains. Interest in electrical properties of biological materials resulted in engineering research in this field. The results of measurements are used for determining the moisture content, the surface level of liquid and grainy materials, for controlling the presence of pests in grain storage, for a quantitative determination of mechanical damage, in applications of dielectric heating, and in many other cases. Electrical measurements on these materials are of fundamental importance in relation to the analysis of quantity of absorbed water and dielectric heating characteristics. It is a well-known fact that electrical properties of materials, namely dielectric constant and conductivity, are affected by the moisture content of material. This fact is important for the design of many commercial moisture-testing instruments for agricultural products. The knowledge of dielectric properties of materials is necessary for the application of dielectric heating. The aim of this work was to perform the measurements of conductivity, dielectric constant and loss tangent on samples of popcorn grains, the electrical properties of which had not been sufficiently measured. Measurements were performed under variable moisture content and the frequency of electric field in the range from 1 MHz to 16 MHz, using a Q meter with a coaxial probe. It was concluded that conductivity, dielectric constant and loss tangent increased with increase of moisture content, and dielectric constant and loss factor decreased as the frequency of electric field increased.

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Mechanical and electrical properties of the solid sapropel

Environment Technology Resources Proceedings of the International Scientific and Practical Conference ◽

10.17770/etr2015vol1.622 ◽

2015 ◽

Vol 1 ◽

pp. 139

Author(s):

Andris Martinovs ◽

Josef Timmerberg ◽

Rasma Tretjakova ◽

Paul Beckmann ◽

Valentina Popa ◽

...

Keyword(s):

Electrical Properties ◽

Electric Field ◽

Compression Strength ◽

Electrical Resistance ◽

Relative Permittivity ◽

Ultimate Strain ◽

Drying Process ◽

Field Frequency ◽

Mechanical And Electrical Properties ◽

Electric Field Frequency

In this paper are explored the mechanical (ultimate compression strength, ultimate strain, Young’s modulus, hardness) and the electrical (relative permittivity, specific electrical resistance, quality factor, their dependence on the electric field frequency in the range till 1MHz) properties of the solid sapropel. For the researches are used samples from the solid, monolith sapropel (obtained in the drying process) and samples from the sapropel powder that are pressed with a different force; before the measurements, a part of these samples were heated. There is explored the dependence of the relative permittivity on temperature. Are explored the methods for the forming of the products from the solid sapropel powder.

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Wideband and high gain dielectric resonator antenna for 5G applications

Bulletin of Electrical Engineering and Informatics ◽

10.11591/eei.v8i3.1592 ◽

2019 ◽

Vol 8 (3) ◽

pp. 1047-1052

Author(s):

Irfan Ali ◽

Mohd Haizal Jamaluddin ◽

M. R. Kamarudin ◽

Abinash Gaya ◽

R. Selvaraju

Keyword(s):

Loss Tangent ◽

Relative Permittivity ◽

Dielectric Resonator ◽

Dielectric Material ◽

High Gain ◽

Impedance Bandwidth ◽

Antenna Gain ◽

Dielectric Resonator Antenna ◽

Full Wave ◽

Slot Aperture

In this paper, wideband high gain dielectric resonator antenna for 5G applications is presented. Higher order mode is exploited to enhance the antenna gain, while the array of symmetrical cylindrical shaped holes drilled in the DRA to improves the bandwidth by reducing the quality factor. The proposed DRA is designed using dielectric material with relative permittivity of 10 and loss tangent of 0. 002.The Rogers RT/Droid 5880 has been selected as substrate with relative permittivity of 2.2, loss tangent of 0.0009- and 0.254-mm thickness. The simulated results show that, the proposed geometry has achieved a wide impedance bandwidth of 17.3% (23.8-28.3GHz=4.5 GHz) for S11-10 dB, and a maximum gain of about 9.3 dBi with radiation efficiency of 96% at design frequency of 26 GHz. The DRA is feed by microstrip transmission line with slot aperture. The reflection coefficient, the radiation pattern, and the antenna gain are studied by full-wave EM simulator CST Microwave Studio. The proposed antenna can be used for the 5G communication applications such as device to device communication (D2D).

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Effects of Moisture Absorption on the Dielectric Properties of Nanoclay-Reinforced Epoxy for Radome Applications

Volume 9: Mechanics of Solids, Structures and Fluids ◽

10.1115/imece2014-38815 ◽

2014 ◽

Author(s):

Carla Garcia ◽

Christine Chesley ◽

Joshua L. Cohn ◽

Landon Grace

Keyword(s):

Dielectric Properties ◽

Moisture Content ◽

Loss Tangent ◽

Relative Permittivity ◽

Moisture Absorption ◽

Chemical Interaction ◽

Polymer Materials ◽

Moisture Barrier ◽

Diffusion Behavior ◽

Physical And Chemical

The relative permittivity and loss tangent at 10 GHz of a nanoclay-reinforced epoxy is investigated as a function of nanoclay loading percentage and moisture content. The energy dissipation associated with frictional and inertial losses during the reorientation of absorbed dipole water molecules exposed to an oscillating electromagnetic field has a significant impact on the relative permittivity and loss tangent of moisture-contaminated polymer materials. This can damage the performance of polymer-based radar-protecting structures (radomes) designed to protect sensitive radar equipment. Thus, prevention or minimization of water absorption in these materials is critical to mitigating this effect. The moisture barrier properties of nanoclay reinforcement are well known, and are targeted in this study as a potential method to reduce the moisture absorption rate and therefore improve the performance of polymer-based radomes exposed to precipitation and humid air. The ability of a water molecule to rotate freely in the presence of an EM field is dependent on its physical and chemical state; whether it be bound and unable to rotate, or unbound and able to dissipate energy through unrestricted rotation. Therefore, any potential dielectric property changes associated with the physical and chemical interaction of water and nanoclay must be quantified prior to exploiting prospective moisture-barrier benefits. In this study, the relative permittivity and loss tangent of an epoxy system reinforced with nanoclay up to 5% content by weight are assessed using a resonant cavity technique at 10 GHz during moisture uptake due to immersion in distilled water at 25°C. Variations in moisture diffusion behavior are observed due to the nanoclay loading percentage. Although deviations in the dielectric properties due solely to nanoclay loading percentage are minimal, effects due to moisture absorption are much more prominent. In the most extreme case, a nearly 15% increase in relative permittivity is observed at 5% moisture content by weight, with a direct correlation between diffusion behavior and degradation of relative permittivity observed for all samples. Likewise, an increase in the loss tangent of approximately 220% is observed at 5% moisture content by weight.

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Mathematical model to predict the characteristics of polarization in dielectric materials: The concept of piezoelectrcity and electrostriction

10.31221/osf.io/39572 ◽

2019 ◽

Author(s):

Chem Int

Keyword(s):

Mathematical Model ◽

Electric Field ◽

Lead Zirconate Titanate ◽

Dielectric Material ◽

Strain Curve ◽

Dielectric Materials ◽

Lead Zirconate ◽

Simulation Software ◽

Constitutive Law ◽

Basic Material

Model was developed for the prediction of polarization characteristics in a dielectric material exhibiting piezoelectricity and electrostriction based on mathematical equations and MATLAB computer simulation software. The model was developed based on equations of polarization and piezoelectric constitutive law and the functional coefficient of Lead Zirconate Titanate (PZT) crystal material used was 2.3×10-6 m (thickness), the model further allows the input of basic material and calculation of parameters of applied voltage levels, applied stress, pressure, dielectric material properties and so on, to generate the polarization curve, strain curve and the expected deformation change in the material length charts. The mathematical model revealed that an application of 5 volts across the terminals of a 2.3×10-6 m thick dielectric material (PZT) predicted a 1.95×10-9 m change in length of the material, which indicates piezoelectric properties. Both polarization and electric field curve as well as strain and voltage curve were also generated and the result revealed a linear proportionality of the compared parameters, indicating a resultant increase in the electric field yields higher polarization of the dielectric materials atmosphere.

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