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Готові списки джерел за темами / Electric waves Measurement / Статті в журналах

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Статті в журналах з теми "Electric waves Measurement"

Автор: Grafiati

Опубліковано: 10 грудня 2022

Оновлено: 31 липня 2025

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1

Klimchitskaya, Galina L., and Vladimir M. Mostepanenko. "Casimir Effect Invalidates the Drude Model for Transverse Electric Evanescent Waves." Physics 5, no. 4 (2023): 952–67. http://dx.doi.org/10.3390/physics5040062.

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We consider the Casimir pressure between two metallic plates and calculate the four contributions to it determined by the propagating and evanescent waves and by the transverse magnetic and transverse electric polarizations of the electromagnetic field. The range of interplate separations is considered where nearly the whole pressure has its origin in the electromagnetic response of conduction electrons. In the Casimir physics, this response is described either by the dissipative Drude model resulting in contradictions with the measurement data or by the experimentally consistent but dissipati

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2

Lirette, Robert, Tomasz Karpisz, Małgorzata Musiał, et al. "Measurements of nonlinear electric-acoustic interactions in lead zirconium titanate." Journal of the Acoustical Society of America 155, no. 3_Supplement (2024): A204. http://dx.doi.org/10.1121/10.0027311.

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When electric and acoustic waves simultaneously pass through a piezoelectric material, nonlinearities can arise. The electric and acoustic waves can mix, generating a signal consisting of both sum and difference spectral components. Here we present a method of directly measuring the nonlinearly mixed electric-acoustic signal using a vector network analyzer (VNA). In normal VNA operation, sources and receivers operate at the same frequency. In our measurements, we employ a frequency offset mode, where receivers in the VNA can be tuned to a frequency different from the source frequency. Here, we

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3

PLYSHCHENKOV, BORIS D., and ANATOLY A. NIKITIN. "BOREHOLE ACOUSTIC AND ELECTRIC STONELEY WAVES AND PERMEABILITY." Journal of Computational Acoustics 18, no. 02 (2010): 87–115. http://dx.doi.org/10.1142/s0218396x10004085.

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New way for quantitative evaluation of any value of formation permeability based on numerical experiments with Pride's model of electrokinetic phenomena is presented. This approach is based on simultaneous measurement of pressure field and axial component of electric field excited by an acoustic source in fluid-filled borehole with help a set of receivers in borehole. Frequency dependence of ratio of the complex-valued amplitudes of the electric Stoneley wave to the pressure Stoneley wave obtained as a result of plane-wave decomposition of pressure field and mentioned component of electric fie

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4

Ghani, Muhammad Usman, M. Imran Jamil, Afaq Ahmad, and Saad Tariq. "Electron affinity measurement of hydrogen negative ion." Pakistan Journal of Emerging Science and Technologies (PJEST) 4, no. 2 (2023): 1–8. http://dx.doi.org/10.58619/pjest.v4i2.101.

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Photodetachment Microscopy experiment was first carried out in the presence of an electric field by Blondel et al in 1996 for Bromine negative ion. It measures the spatial distribution of ejected electrons on the detector screen which is a direct view of the spatial structure of the wave function of an atomic electron in the form of a ring pattern. From a semi-classical point of view, this ring pattern is formed because of the interference between two electron waves; one is direct while the other is reflected from an electric field. Following Blondel's photodetachment microscopy experiment, a

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5

Maeda, Masataka, Tatsuo Takada, and Masao Ide. "Measurement of Electric Field Distributions in Solid Dielectrics Using Ultrasonic Waves." Japanese Journal of Applied Physics 29, S1 (1990): 203. http://dx.doi.org/10.7567/jjaps.29s1.203.

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6

Sugaya, Toshio, and Yukio Kawano. "Frequency-Tunable Terahertz Plasmonic Structure Based on the Solid Immersed Method for Sensing." Sensors 21, no. 4 (2021): 1419. http://dx.doi.org/10.3390/s21041419.

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Terahertz waves are located in the frequency band between radio waves and light, and they are being considered for various applications as a light source. Generally, the use of light requires focusing; however, when a terahertz wave is irradiated onto a small detector or a small measurement sample, its wavelength, which is much longer than that of visible light, causes problems. The diffraction limit may make it impossible to focus the terahertz light down to the desired range by using common lenses. The Bull’s Eye structure, which is a plasmonic structure, is a promising tool for focusing the

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7

Assaffat, Luqman, Herman Dwi Surjono, and Fatchul Arifin. "Harmonic Detection of Electric Current using Machine Learning: A Literature Review." Journal of Advanced Research Design 132, no. 1 (2025): 140–51. https://doi.org/10.37934/ard.132.1.140151.

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The increased use of nonlinear devices makes distortions in the form of current and voltage waves unavoidable in power grids. As a result, harmonics, sub-harmonics and inter-harmonics often occur in the current and voltage spectrum. Harmonics cause many problems such as overpower loss, overvoltage, imbalance, flicker, relay miss operation, etc. Harmonic distortion of electric current can be measured directly in harmonically contaminated systems. Various standards have already been established in different measurement procedures and many other techniques have been proposed for analysing, charac

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8

Myllys, M., P. Henri, X. Vallières, et al. "Electric field measurements at the plasma frequency around comet 67P by RPC-MIP on board Rosetta." Astronomy & Astrophysics 652 (August 2021): A73. http://dx.doi.org/10.1051/0004-6361/201936633.

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Context. The Mutual Impedance Probe (RPC-MIP) carried by the Rosetta spacecraft monitored both the plasma density and the electric field in the close environment of comet 67P/Churyumov–Gerasimenko (67P), as the instrument was operating alternatively in two main modes: active and passive. The active mode is used primarily to perform plasma density measurements, while the passive mode enables the instrument to work as a wave analyzer. Aims. We are reporting electric field emissions at the plasma frequency near comet 67P observed by RPC-MIP passive mode. The electric field emissions are related t

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9

Kural, Aleksander, Rhys Pullin, C. A. Featherston, et al. "Wireless Power Transmission Using Ultrasonic Guided Waves – Electric Circuit Measurement and Simulation." Key Engineering Materials 518 (July 2012): 445–54. http://dx.doi.org/10.4028/www.scientific.net/kem.518.445.

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A project investigating the possibility to transmit electrical power (several mW) along the structure of an aircraft by using an intermediate medium of ultrasonic Lamb waves is being carried out at Cardiff University in conjunction with Airbus. This power supply method is aimed at wireless, surface-bonded sensor packages, primarily for the aircraft structural health monitoring (SHM) applications. It is expected to replace conventional batteries or energy harvesting devices. This paper presents methods of piezoelectric transducer characterisation, electric power measurement and electric circuit

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10

PLYSHCHENKOV, BORIS D., and ANATOLY A. NIKITIN. "QUANTITATIVE EVALUATION OF FORMATION PERMEABILITY FROM ACOUSTIC AND ELECTRIC STONELEY WAVES." International Journal of Applied Mechanics 02, no. 03 (2010): 585–615. http://dx.doi.org/10.1142/s1758825110000676.

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Numerical experiments based on Pride's model of electrokinetic phenomena have shown that electromagnetic Stoneley waves as well as pressure Stoneley waves are most sensitive to permeability variations. A new way for quantitative evaluation of any value of formation permeability is presented. It is based on simultaneous measurement of pressure field and axial component of electric field excited by an acoustic source in fluid-filled borehole with help from a set of receivers in borehole. Frequency dependence of ratio of the complex-valued amplitudes of the electric Stoneley wave to the pressure

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11

Kozaczka, Eugeniusz, Jacek Domagalski, Grażyna Grelowska, and Ignacy Gloza. "Identification of hydro-acoustic waves emitted from floating units during mooring tests." Polish Maritime Research 14, no. 4 (2007): 40–46. http://dx.doi.org/10.2478/v10012-007-0038-5.

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Identification of hydro-acoustic waves emitted from floating units during mooring tests Measurements of hydro-acoustic noise emitted from vessels are a.o. a subject of the tests carried out in the control measurement ranges of the Navy. The measurements are performed both on anchored and floating vessels. Acoustic field of vessels is changing along with their speed changing and is associated with acoustic activity of wave sources installed in vessel's hull (main engines, electric generating sets, reduction gears, pumps, shaft-lines, piping, ventilating ducts etc) as well as hydro-dynamic sourc

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12

Farid, Arvin, Holly Gunderson, Rakesh Acharya, and Jim Browning. "Electromagnetic Waves’ Impact on Hydraulic Conductivity of Granular Soils." Geotechnics 3, no. 3 (2023): 561–83. http://dx.doi.org/10.3390/geotechnics3030031.

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Electromagnetic (EM) waves, traditionally used for purposes such as geophysical characterization, impact properties to be measured. This paper describes the effects of radio frequency (RF) waves on the hydraulic conductivity of glass beads and natural sand. A series of tests was conducted using a customized, rigid-wall, cylindrical permeameter inside a resonant cavity made of Plexiglas covered with electrically conductive transparent films. Constant-head ASTM-D2434 tests were performed to measure the samples’ hydraulic conductivity. RF stimulation was performed using a magnetically coupled loo

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13

Yu, Hai Bo, Jia Liu, Chun Yu Wang, Li Li, and Rui Ming Tong. "Preliminary Study on the Effect of Operating Conditions on the Measurement Accuracy of Electronic Type Electric Energy Meter." Advanced Materials Research 834-836 (October 2013): 1246–50. http://dx.doi.org/10.4028/www.scientific.net/amr.834-836.1246.

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The verification of electronic type electric energy meter is under strict reference conditions, but some special operating conditions at locale will exceed the standard scopes. In order to improve the calculation accuracy and operating reliability of electric energy meter under operating conditions, it is necessary to study the operating conditions. According to the working principle and the standard verification regulation of electronic type electric energy meter, this paper summarizes these operating conditions: low power factor, harmonic waves, dynamic impulsive load, voltage fluctuation an

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14

He, Penglong, Bo Zhang, and Jinliang He. "Characteristic of acoustic waves generated in dielectrics under divergent electric fields." Journal of Applied Physics 132, no. 24 (2022): 244104. http://dx.doi.org/10.1063/5.0125160.

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Space charge measurement under divergent electric fields can provide crucial insight into various insulating phenomena, and the space charge reconstruction relies on the relation between the measured acoustic wave and the space charge distribution if the pulsed electroacoustic method is used. However, the relation is still unclear. In this work, the characteristic of acoustic waves generated by a divergent electric field is studied. Three components of electrostatic force leading to acoustic waves, which are surface force, internal Coulomb force, and electrostrictive force, are considered. The

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15

Mozer, F. S., O. Agapitov, S. D. Bale, et al. "Origin of the type III radiation observed near the Sun." Astronomy & Astrophysics 690 (October 2024): L6. http://dx.doi.org/10.1051/0004-6361/202451134.

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Aims. We investigate processes associated with the generation of type III radiation using Parker Solar Probe measurements. Methods. We measured the amplitudes and phase velocities of electric and magnetic fields and their associated plasma density fluctuations. Results. 1. There are slow electrostatic waves near the Langmuir frequency and at as many as six harmonics, the number of which increases with the amplitude of the Langmuir wave. Their electrostatic nature is shown by measurements of the plasma density fluctuations. From these density fluctuations and the electric field magnitude, the k

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16

Křivánek, Ivo. "Dielectric properties of materials at microwave frequencies." Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis 56, no. 5 (2008): 125–32. http://dx.doi.org/10.11118/actaun200856050125.

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The paper introduces the review of the present state of art in the measurement of the interaction of electromagnetic waves with different kinds of materials. It is analysis of the possibilities of the measurement of the interaction of high frequencies waves (microwaves) with materials and proposal of the experimental method for the studies mentioned above.The electromagnetic field consists of two components: electric and magnetic field. The influence of these components on materials is different. The influence of the magnetic field is negligible and it has no impact on practical use. The infl

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17

Constantin, Florin Lucian. "Phase-Sensitive Vector Terahertz Electrometry from Precision Spectroscopy of Molecular Ions." Atoms 8, no. 4 (2020): 70. http://dx.doi.org/10.3390/atoms8040070.

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This article proposes a new method for sensing THz waves that can allow electric field measurements traceable to the International System of Units and to the fundamental physical constants by using the comparison between precision measurements with cold trapped HD+ ions and accurate predictions of molecular ion theory. The approach exploits the lightshifts induced on the two-photon rovibrational transition at 55.9 THz by a THz wave around 1.3 THz, which is off-resonantly coupled to the HD+ fundamental rotational transition. First, the direction and the magnitude of the static magnetic field ap

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18

Fujinawa, Yukio, Kozo Takahashi, Yoichi Noda, Hiroshi Iitaka, and Shinobu Yazaki. "Remote Detection of the Electric Field Change Induced at the Seismic Wave Front from the Start of Fault Rupturing." International Journal of Geophysics 2011 (2011): 1–11. http://dx.doi.org/10.1155/2011/752193.

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Seismic waves are generally observed through the measurement of undulating elastic ground motion. We report the remote detection of the Earth's electric field variations almost simultaneously with the start of fault rupturing at about 100 km from the fault region using a special electric measurement. The rare but repeated detection indicates that the phenomenon is real. The characteristic time of diffusion is almost instantaneous, that is, less than 1 second to travel 100 km, more than ten times faster than ordinary seismic P wave propagation. We suggest that the measured electric field change

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19

Pan, Jicheng, Lei Chen, Shuangdi Zhao, and Tianling Zhang. "A 2-D Fully Polarized Van Atta Array Based on Wide-Beam Tri-Polarized Antennas." Micromachines 15, no. 11 (2024): 1400. http://dx.doi.org/10.3390/mi15111400.

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This paper proposes a 2-D fully polarized Van Atta array, which consists of four tri-polarized antenna elements. The tri-polarized antenna element comprises a monopole antenna and a low-profile microstrip antenna that widens the beam by folding four electric walls. This configuration enables the Van Atta arrays to receive and transmit arbitrarily polarized incident waves over a wider range. The measurement results indicate that the proposed Van Atta array exhibits a −5 dB radar cross-section (RCS) greater than 95° when TE-polarized waves are incident and greater than 134° when TM-polarized wav

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20

Elhady, Alaa, and Eihab Abdel-Rahman. "Measurement of the electric permittivity using Bleustein–Gulyaev wave sensor." Journal of Micromechanics and Microengineering 32, no. 3 (2022): 034004. http://dx.doi.org/10.1088/1361-6439/ac4e78.

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Abstract We present a novel compact electric permittivity sensor that exploits Bleustein–Gulyaev waves propagating along the surface of shear-poled piezoelectrics. We formulate the dynamic nonlinear electromechanical partial differential equations of motion governing wave propagation under electromagnetically quasistatic conditions. The permittivity of the medium-under-test was found to influence the sensor eigenvalues, enabling the implementation of a frequency-shift permittivity sensor. Solution of the equations of motion demonstrates resonance of the first and third modes when excited using

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21

Zen, Hardi, Indra Ranu Kusuma, and Endang Widjiati. "Robust Laboratory Scale Seakeeping Test Wave Measurement Method Use Ultrasonic Sensor." IOP Conference Series: Earth and Environmental Science 1081, no. 1 (2022): 012042. http://dx.doi.org/10.1088/1755-1315/1081/1/012042.

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Abstract The seakeeping test is one of the tests done in the Indonesia Hydrodynamic Laboratory (IHL) test tank on a model ship or floating unit. In the test tank, a wave can be generated by using electric and mechanic wave flaps that are pre-programmed on a certain condition of the wave, i.e. different frequencies and amplitude. To measure waves, produced by a wave generator, a wave measuring instrument is needed that can measure changes in water level in the test tank. The current wave measuring instrument is in the form of a 600 mm twin wire wave probe. This instrument is can be used to meas

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22

Im, Kwang-Hee, Sun-Kyu Kim, Jong-An Jung, Young-Tae Cho, Yong-Deuck Woo, and Chien-Ping Chiou. "NDE Terahertz Wave Techniques for Measurement of Defect Detection on Composite Panels of Honeycomb Sandwiches." Electronics 9, no. 9 (2020): 1360. http://dx.doi.org/10.3390/electronics9091360.

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Terahertz wave (T-ray) technologies have become a popular topic in scientific research over the last two decades, and can be utilized in nondestructive evaluation (NDE) techniques. This study suggests an optimal scanning technique method for honeycomb sandwich composite panels, where skins were utilized with two different skins, namely, carbon fiber-reinforced plastic (CFRP) skin and glass fiber-reinforced plastic (GFRP) skin, as layers of the panel surfaces. Foreign objects were artificially inserted between the skins and honeycomb cells in the honeycomb sandwich composite panels. For this ex

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23

Strizhak, V. A., and A. V. Pryakhin. "Optimization of the Parameters of the Magnetizing Device of the Electromagnetic-Acoustic Transducer." Devices and Methods of Measurements 14, no. 2 (2023): 81–95. http://dx.doi.org/10.21122/2220-9506-2023-14-2-81-95.

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Contactless electromagnetic-acoustic transducers have a set of significant advantages over contact transducers, but at the same time they have significant disadvantages that require the development of effective magnetizing devices. Compared to magnetizing devices that are using permanent magnets, electric current magnetization devices are easily removed from the object of testing and cleaned from contamination by metal particles. Unfortunately, such transducers have significant dimensions and weight.A transducer containing a magnetic circuit magnetized by an electric current coil and two indep

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24

Hraniak, V. "METHOD AND MEANS FOR MEASURING THE TEMPERATURE OF THE POLE WINDINGS OF THE ELECTRIC MACHINE ROTOR." Odes’kyi Politechnichnyi Universytet Pratsi 1, no. 63 (2021): 78–87. http://dx.doi.org/10.15276/opu.1.63.2021.08.

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The temperature of the pole windings is one of the main informative parameters, the deviation of which may indicate the presence of a number of common defects of electrical machines. However, the implementation of high-precision means for measuring the temperature of the pole windings of the electric machine rotor is associated with a number of technical difficulties. The aim is to increase the accuracy of measuring the temperature of the pole windings of the rotor of an electric machine by developing a contactless method and means of measuring the temperature of the pole windings of the rotor

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25

Zhu, Zhenya, M. Nafi Toksöz, and Daniel R. Burns. "Electroseismic and seismoelectric measurements of rock samples in a water tank." GEOPHYSICS 73, no. 5 (2008): E153—E164. http://dx.doi.org/10.1190/1.2952570.

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An electromagnetic (EM) or seismic wave can induce seismic or EM waves because of the electrokinetic conversion based on the electric double layer in a fluid-saturated porous medium. We tested a new method for observing electroseismic and seismoelectric conversions in rock samples. Our method is designed to overcome the shortcoming of previous attempts to separate signals generated by a continuous electric or seismic source in a small container. We first observed acoustic fields around electrodes excited by an electric pulse in a water tank or in a water-saturated porous sample. In our approac

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26

Harshkova, Yuliya S., Sergey V. Maly, Andrei V. Tkachenia, and Igor E. Kheidorov. "Increasing the metrological characteristics of anechoic chambers due to a posteriori analysis based on artificial neural networks." Journal of the Belarusian State University. Physics, no. 3 (October 5, 2022): 93–103. http://dx.doi.org/10.33581/2520-2243-2022-3-93-103.

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This article considers the possibility of improving the metrological characteristics of an anechoic chamber due to a posteriori processing of measurement results based on a generative adversarial model of an artificial neural network in order to reduce the influence on the distribution of the electromagnetic field in the measuring zone of waves reflected from the outer boundaries of the chamber and the equipment located in it. The training of the neural network was carried out on a data set obtained as part of a computational experiment and including the distribution of the electromagnetic fie

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27

Bury, Peter, Marek Veveričík, František Černobila, Peter Kopčanský, Milan Timko, and Vlasta Závišová. "Study of Structural Changes in Nematic Liquid Crystals Doped with Magnetic Nanoparticles Using Surface Acoustic Waves." Crystals 10, no. 11 (2020): 1023. http://dx.doi.org/10.3390/cryst10111023.

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The surface acoustic waves (SAWs) were used to study the effect of magnetic nanoparticles on nematic liquid crystal (NLC) behavior in weak magnetic and electric fields. The measurement of the attenuation of SAW propagating along the interface between piezoelectric substrate and liquid crystal is showed as an effective tool to study processes of structural changes. The magnetic nanoparticles Fe3O4 of nanorod shape and different low volume concentration were added to the NLC (4-(trans-4′-n-hexylcyclohexyl)-isothiocyanatobenzene (6CHBT)) during its isotropic phase. In contrast to undoped liquid c

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28

Spratt, Kyle S., and Jonathan S. Abel. "Measurement and modeling of an electromechanical spring reverb device." Journal of the Acoustical Society of America 152, no. 4 (2022): A220. http://dx.doi.org/10.1121/10.0016069.

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A spring reverb is an electromechanical device used to artificially reverberate an audio signal, i.e. to impart a sense of spaciousness to the audio signal, as if the sound were being emitted into a reverberant acoustic space. The device consists of a number of helical springs set into motion by electrically driven magnetized beads, with the elastic wave motion along the springs being analogous to acoustic waves propagating along the various dimensions of a room. While originally invented by the Hammond organ company to add a sense of spaciousness to the sound of their electric organs, spring

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29

Zhu, Zhenya, Matthijs W. Haartsen, and M. Nafi Toksöz. "Experimental studies of electrokinetic conversions in fluid‐saturated borehole models." GEOPHYSICS 64, no. 5 (1999): 1349–56. http://dx.doi.org/10.1190/1.1444639.

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Experimental and theoretical studies show that there are electromagnetic (EM) fields generated by seismic waves with two kinds of conversion mechanisms in a fluid‐saturated, porous medium. Within a homogeneous formation, the seismic wave generates a seismoelectric field that exists only in the area disturbed by the seismic wave and whose apparent velocity is that of the seismic wave. At an interface between differing formation properties, the generated seismoelectric wave is a propagating EM wave that can be detected everywhere. An electrode, used as a receiver on the ground surface, can detec

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30

Hidayat, M. Reza, Mohamad Hamzah Zamzam, and Salita Ulitia Prini. "Excitation Analysis of Transverse Electric Mode Rectangular Waveguide." Jurnal Elektronika dan Telekomunikasi 20, no. 1 (2020): 1. http://dx.doi.org/10.14203/jet.v20.1-8.

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A waveguide is a transmission medium in the form of a pipe and is made from a single conductor. A waveguide has the function of delivering electromagnetic waves with a frequency of 300 MHz - 300 GHz and is able to direct the waves in a particular direction. In its development, a waveguide can be used as a filter. A filter consists of several circuits designed to pass signals that are generated at a specific frequency and attenuate undesired signals. One type of filter that can pass a signal in a particular frequency range and block signals that are not included in that frequency range is a ban

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31

Mozer, F. S., O. Agapitov, S. D. Bale, et al. "Density Enhancement Streams in The Solar Wind." Astrophysical Journal Letters 957, no. 2 (2023): L33. http://dx.doi.org/10.3847/2041-8213/ad0721.

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Abstract This Letter describes a new phenomenon on the Parker Solar Probe of recurring plasma density enhancements that have Δn/n ∼ 10% and that occur at a repetition rate of ∼5 Hz. They were observed sporadically for about 5 hr between 14 and 15 solar radii on Parker Solar Probe orbit 12 and they were also seen in the same radial range on both the inbound and outbound orbits 11. Their apparently steady-state existence suggests that their pressure gradient was balanced by the electric field. The X-component of the electric field component produced from this requirement is in good agreement wit

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32

Karbashewski, S., O. V. Agapitov, H. Y. Kim, et al. "Whistler Wave Observations by Parker Solar Probe During Encounter 1: Counter-propagating Whistlers Collocated with Magnetic Field Inhomogeneities and their Application to Electric Field Measurement Calibration." Astrophysical Journal 947, no. 2 (2023): 73. http://dx.doi.org/10.3847/1538-4357/acc527.

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Abstract Observations of the young solar wind by the Parker Solar Probe (PSP) mission reveal the existence of intense plasma wave bursts with frequencies between 0.05 and 0.20f ce (tens of hertz up to ∼300 Hz) in the spacecraft frame. The wave bursts are often collocated with inhomogeneities in the solar wind magnetic field, such as local dips in magnitude or sudden directional changes. The observed waves are identified as electromagnetic whistler waves that propagate either sunward, anti-sunward, or in counter-propagating configurations during different burst events. Being generated in the so

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Cao, Bing Xia, and Xiao Lin Qiao. "Schumann Resonance Measurement Based on Nonlinear Interaction." Key Engineering Materials 439-440 (June 2010): 1294–99. http://dx.doi.org/10.4028/www.scientific.net/kem.439-440.1294.

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Schumann Resonance relates with global temperature variations, new geophysics phenomena in the low ionosphere and short-term earthquake prediction etc. In this paper based on the nonlinear modulation model of high frequency and extreme-low frequency electromagnetic waves in low ionosphere, the Schumann Resonance observing is researched. Taking the fair weather electric field in account, the cross modulation index was 4.2×10-4. At the first Schumann Resonance observatory of China, the first 4 peaks of Schumann Resonance respectively at 7, 14, 20, 26Hz were obtained in demodulation spectra of th

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Keun, Jongho, Taekyeong Jin, Jeonghee Jin, and Hosung Choo. "Analysis of High-Power Radar Propagation Environments Around the Test Site." Applied Sciences 15, no. 13 (2025): 7305. https://doi.org/10.3390/app15137305.

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In this paper, we propose a novel evaluation method to assess the strength of electromagnetic (EM) waves in a specific area by analyzing the propagation environment at a radar testing site. To analyze the propagation environment of the radar test site, this evaluation method performs precise modeling of actual structures such as buildings and terrain. The calculated received power is then converted into electric field strength to compare with the reference threshold level (61 V/m). The electric field during the radar operation is examined by changing two scenarios: one is when the transmitter

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Tigrine, Z., H.-C. Nataf, N. Schaeffer, P. Cardin, and F. Plunian. "Torsional Alfvén waves in a dipolar magnetic field: experiments and simulations." Geophysical Journal International 219, Supplement_1 (2019): S83—S100. http://dx.doi.org/10.1093/gji/ggz112.

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SUMMARY The discovery of torsional Alfvén waves (geostrophic Alfvén waves) in the Earth’s core (Gillet et al. 2010) calls for a better understanding of their properties. We present the first experimental observations of torsional Alfvén waves, performed in the DTS-Ω set-up. In this set-up, 50 L of liquid sodium are confined between an inner sphere (ri = 74 mm) and an outer shell (ro = 210 mm). The inner sphere houses a permanent magnet, imposing a dipolar magnetic field (Bmax = 345 mT). Both the inner sphere and the outer shell can rotate around the vertical axis. Alfvén waves are triggered by

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Waindok, Andrzej, and Paweł Piekielny. "Transient Analysis of a Railgun with Permanent Magnets Support." Acta Mechanica et Automatica 11, no. 4 (2017): 302–7. http://dx.doi.org/10.1515/ama-2017-0046.

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Abstract The calculation and measurement results of transients for an electrodynamic accelerator with permanent magnet support have been presented in this paper. The calculations have been made using the magnetostatic model in the Maxwell software, as well as using a Matlab/Simulink transient model. The waves of mechanical parameters (projectile velocity and acceleration, force) and electric ones (excitation current and capacitor voltage) have been analyzed for different supply conditions (voltage value, capacitance). The efficiency and projectile energy have been studied as well. The mathemat

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Miftakhudin, Miftakhudin, Dody Wahjudi, and Tri Watiningish. "ANALISIS PENGARUH KUAT MEDAN LISTRIK TERHADAP LINGKUNGAN DIBAWAH TRANSMISI SUTET 500 KV PENGHANTAR PEDAN-KESUGIHAN." Teodolita: Media Komunkasi Ilmiah di Bidang Teknik 23, no. 2 (2023): 56–64. http://dx.doi.org/10.53810/jt.v23i2.456.

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Medan listrik merupakan bagian dari medan elektromagnetik yang timbul karena gelombang yang dihasilkan karena sumber arus dan tegangan. Contoh yang menghasilkan medan listrik adalah saluran transmisi. Pada SUTET memiliki tegangan kerja sebesar 500 kV, yang mana semakin besar tegangan yang dihasilkan, maka semakin besar pula medan listriknya. Untuk dapat menurunkan besarnya nilai medan listrik yang disebabkan oleh adanya SUTET, maka dilakukan penelitian dan pengukuran langsung di bawah transmisi SUTET. Selain dilakukan pengukuran besar medan listrik, dilakukan juga

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Kasaba, Y., J. L. Bougeret, L. G. Blomberg, et al. "The Plasma Wave Investigation (PWI) onboard the BepiColombo/MMO: First measurement of electric fields, electromagnetic waves, and radio waves around Mercury." Planetary and Space Science 58, no. 1-2 (2010): 238–78. http://dx.doi.org/10.1016/j.pss.2008.07.017.

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Chng, Tat Loon, David Z. Pai, Olivier Guaitella, Svetlana M. Starikovskaia, and Anne Bourdon. "Effect of the electric field profile on the accuracy of E-FISH measurements in ionization waves." Plasma Sources Science and Technology 31, no. 1 (2022): 015010. http://dx.doi.org/10.1088/1361-6595/ac4592.

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Abstract Electric field induced second harmonic (E-FISH) generation has emerged as a versatile tool for measuring absolute electric field strengths in time-varying, non-equilibrium plasmas and gas discharges. Yet recent work has demonstrated that the E-FISH signal, when produced with tightly focused laser beams, exhibits a strong dependence on both the length and shape of the applied electric field profile (along the axis of laser beam propagation). In this paper, we examine the effect of this dependence more meaningfully, by predicting what an E-FISH experiment would measure in a plasma, usin

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Sener, Ummu S., and Sebahattin Eker. "Nondestructive Approach for Complex-Shaped Cracks in Concrete Structures by Electromagnetic Waves with FDTD Technique." Mathematical Problems in Engineering 2021 (June 1, 2021): 1–14. http://dx.doi.org/10.1155/2021/6624982.

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Concrete cracks have no specific shape and do not show linearity. Since the natural occurrences of concrete cracks make simulation identification difficult, rectangular step function and a dynamic geometry are used to define a concrete surface crack in the natural process. A novel interior crack expression is obtained by accepting the area between two curves as a crack filled by air in concrete and modeling this area like a Riemann integral domain. Taking the partition of this integral domain, the most realistic definition of the crack is made. Electromagnetic (EM) waves are utilized for numer

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Rehman, Ali, Zeeshan Najam Khan, Muhammad Siddique, Muhammad Shahzad, Makhdoom Muhammad Naeem, and Majid Hussain. "An Artificial Intelligence Based Current Measurement Technique in High Voltage Power Transmission and Distribution Lines using Pyro-Sensors." Pakistan Journal of Engineering and Technology 4, no. 2 (2021): 94–99. http://dx.doi.org/10.51846/vol4iss2pp94-99.

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High voltage transmission lines are the fundamental element in order to transfer electricity from the power plant/grid to consumers. The frequency, current and voltage are the key figures to sustain the absolute quality of the power transmission, and maintaining such high performance requires smart solutions and equipment like Current Transformer (CT) & Potential Transformer (PT). This proposed work enlightens an inception to monitor current in the high voltage transmission lines by using pyro-sensors, machine learning (ML) techniques and artificial intelligence (AI). Using pyro-sensors ar

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Lüling, Martin G. "The paradox of anisotropy in electric logging: A simple proof and extensions to other physics domains." GEOPHYSICS 78, no. 1 (2013): W1—W8. http://dx.doi.org/10.1190/geo2012-0123.1.

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Resistivity measurements in vertical wells through horizontally laminated formations suffer the paradox of anisotropy. In a borehole with negligible diameter, the measurement will only read the horizontal resistivity parallel to the laminae: It will be completely blind to the vertical resistivity perpendicular to the laminae, even though the source and sensor electrodes are vertically aligned. Coulomb’s law in anisotropic media explains this counterintuitive phenomenon. The anisotropy changes the Pythagorean distance to a new, anisotropic distance, which includes the inverse conductivity tenso

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Jayadipraja, Erwin Azizi. "ANALYSES OF RADIATION OF ELECTROMAGNETIC WAVES IN THE HIGH-VOLTAGE AIR DUCT (150 kV) CONSTRUCTION ON HEALTH." Public Health of Indonesia 3, no. 4 (2017): 152–59. http://dx.doi.org/10.36685/phi.v3i4.143.

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Background: High-voltage air ducts is the government program to supply electricity needs. However, in practice, obstacles have been identified in the form of rejection from the community due to the outstanding issues that high-voltage air ducts have an impact on health.Aim: This research aims to analysis the magnitude of electromagnetic wave radiation of high-voltage air ducts construction on health.Methods: The study was conducted by measuring electromagnetic wave radiation prior to high-voltage air ducts (150 kV) construction and predicting the amount of radiation generated after this operat

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Tsuburaya, Tomonori, Zhiqi Meng, and Takashi Takenaka. "Inverse Scattering Analysis from Measurement Data of Total Electric and Magnetic Fields by Means of Cylindrical-Wave Expansion." Electronics 8, no. 4 (2019): 417. http://dx.doi.org/10.3390/electronics8040417.

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Microwave tomography is an effective technique to estimate material distribution, where inverse scattering analysis is performed on the assumption that accurate information on the incident field is known for a measurement curve as well as in the target region. In reality, however, the information may often be unobtainable due to multiple scattering between the transmitting antenna and the target object, or existence of unwanted waves and obstacles. In this paper, a method to extract information on incident fields from measured total field data is proposed. The validity of the proposed method i

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45

Kato, Yushi, Shuhei Harisaki, Wataru Kubo, Kouki Iwahara, and Yushi Fujimura. "Initial Experimental Results of Producing Multicharged Ions Efficiently by Lower Hybrid Resonance Heating with Exciting Helicon Waves on Electron Cyclotron Resonance Ion Source." Journal of Physics: Conference Series 2743, no. 1 (2024): 012004. http://dx.doi.org/10.1088/1742-6596/2743/1/012004.

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Abstract Based on experimental results, we considered the accessibility conditions for wave propagation in the magnetized plasma in an electron cyclotron resonance (ECR) ion source (ECRIS), and proposed introducing electromagnetic waves with frequencies lower than those of ECR. We generate the lower hybrid resonance (LHR) in the ECRIS by the electric field of the extra-ordinary mode (X-mode) on the helicon wave which additionally heat the electrons, and then it was conducted to improve the efficiency of multicharged ion generation successfully in over density condition. The electron energy dis

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He, Penglong, Yuxin Liu, Bo Zhang, and Jinliang He. "Evaluation of space charge distribution under a divergent electric field by combining experiment and simulation." Journal of Applied Physics 133, no. 13 (2023): 134101. http://dx.doi.org/10.1063/5.0139008.

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Under divergent electric fields, space charge is locally accumulated and controls the initiation and evolution of insulation degradation phenomena, such as electrical trees and partial discharge. The space charge profiles provide crucial information for evaluating the insulation performance. However, the existing space charge measurement methods are not directly applicable under divergent electric fields. In this paper, a method combining experiment and simulation is proposed to evaluate the space charge distribution around a needle electrode. An experimental system is established, and the aco

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Estrada, J. H., E. A. Cano-Plata, C. Younes-Velosa, and C. L. Cortés. "Entropy and coefficient of variation (CV) as tools for assessing power quality." Ingeniería e Investigación 31, no. 2SUP (2011): 45–50. http://dx.doi.org/10.15446/ing.investig.v31n2sup.25210.

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This paper presents several concepts and techniques for quantifying electric signal entropy and variability for assessing power quality, showing their irregularities, such as the electrical sine wave which delivers power to industry and homes. The paper will review these concepts and show some magnetic radiated waves measurements taken below 115 KV electricity line circuits in the city of Manizales (Colombia) through non-invasive and indirect measurement of the complexity of the current transported by the supply. Entropy, as an accepted indicator of physical complexity, is proportional to the

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Liu, Xiaowen, Lin Li, and Andrew J. Mason. "High-throughput impedance spectroscopy biosensor array chip." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 372, no. 2012 (2014): 20130107. http://dx.doi.org/10.1098/rsta.2013.0107.

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Impedance spectroscopy is a powerful tool for characterizing materials that exhibit a frequency dependent behaviour to an applied electric field. This paper introduces a fully integrated multi-channel impedance extraction circuit that can both generate AC stimulus signals over a broad frequency range and also measure and digitize the real and imaginary components of the impedance response. The circuit was fabricated in a 0.5 μm complementary metal-oxide semiconductor. Tailored for cellular membrane interface characterization, the signal generator produces sinusoidal waves from 10 mHz to 10 kHz

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Pottelette, Raymond, and Matthieu Berthomier. "Nonlinear radiation generation processes in the auroral acceleration region." Annales Geophysicae 35, no. 6 (2017): 1241–48. http://dx.doi.org/10.5194/angeo-35-1241-2017.

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Abstract. It is known from laboratory plasma experiments that double layers (DLs) radiate in the electromagnetic spectrum; but this is only known qualitatively. In these experiments, it was shown that the electron beam created on the high-potential side of a DL generates nonlinear structures which couple to electromagnetic waves and act as a sender antenna. In the Earth auroral region, observations performed by auroral spacecraft have shown that DLs occur naturally in the source region of intense radio emissions called auroral kilometric radiation (AKR). Very high time-, spatial-, and temporal

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Mordasov, M. M., A. P. Savenkov, and K. E. Chechetov. "Non-contact methods for measuring the surface tension of liquids (review)." Industrial laboratory. Diagnostics of materials 86, no. 4 (2020): 29–38. http://dx.doi.org/10.26896/1028-6861-2020-86-4-29-38.

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A review of non-contact methods for determining the surface tension of liquids along with analysis of the physical effects underlying them is presented. A review of non-contact methods for determining the surface tension of liquids along with analysis of the physical effects underlying them is presented. The advantages, disadvantages, possible ranges of measurements and scope of non-contact methods are discussed. Passive methods do not require any stimulation of the measurement object whereas active methods, when implemented, affect the liquid under study. Electrical, electromagnetic, acoustic

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