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Journal articles on the topic 'Electromagnetic emission'

Author: Grafiati

Published: 4 June 2021

Last updated: 14 March 2023

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1

Zhang, Fan, Wang Wang, Dongrong Zhang, Aixin Chen, and Donglin Su. "Radiation Emitter Classification and Identification Approach Based on Radiation Emission Components." Applied Sciences 12, no. 16 (August 16, 2022): 8193. http://dx.doi.org/10.3390/app12168193.

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An electronic system generates a large number of intended or unintended electromagnetic radiated emissions in its operating state, which can lead to potential electromagnetic compatibility (EMC) problems. To avoid the impact of these electromagnetic radiation emissions on the surrounding electronic equipment or systems, it is necessary to classify and identify these radiation emitters. In this paper, we proposed a systematic approach for radiation emitter classification and identification based on radiation emission components. Inspired by the basic emission waveform theory (BEWT), the radiation emission data of electronic systems are decomposed into three kinds of radiation emission components, and the different groups of radiation emission data can be classified or identified according to the similarity of these radiation emission components. The radiation emission (RE) spectral data of several kinds of electronic equipment, such as laptops and digital cameras, were used to verify the proposed method. The classification and identification accuracy for data corresponding to different kinds of radiation emission spectra was about 99%, which confirmed the effectiveness of this method.

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2

Klyuchkin, V. N., V. A. Novikov, V. I. Okunev, and V. A. Zeigarnik. "Comparative analysis of acoustic and electromagnetic emissions of rocks." IOP Conference Series: Earth and Environmental Science 929, no. 1 (November 1, 2021): 012013. http://dx.doi.org/10.1088/1755-1315/929/1/012013.

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Abstract Comparative analysis of acoustic and electromagnetic emissions recorded during the intact rock samples deformation and dynamic rupture of simulated crustal fault is presented. Specialized machines for uniaxial compression and shear tests of rock samples with identical data acquisition systems for both test cases were employed. Increase of acoustic emission was observed accompanied by significant rise of intensity and amplitude of electromagnetic signals at high stress of the rock samples under the uniaxial compression or dynamic failure in the spring-block model. Such correlation is consistent with the previous conclusions that an increase of electromagnetic emission may be considered as a rock failure precursor. Any specific characteristics of the detected electromagnetic signals to be used for prediction of impending rock failure or the earthquake fault rupture were not found. The similarity of electromagnetic signals and their spectra obtained at the press equipment and the spring-block model suggests that in both cases, the signals observed are generated by the crack formations and shear. The electromagnetic emission appeared only in dry samples. The samples saturated by water with the salinity of over 0.1% demonstrated no electromagnetic emission.

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3

Yuwono, Tito, Mohd Hafiz Baharuddin, Norbahiah Misran, Mahamod Ismail, and Mohd Fais Mansor. "A review of measurement of electromagnetic emission in electronic product: Techniques and challenges." Communications in Science and Technology 7, no. 1 (July 31, 2022): 23–37. http://dx.doi.org/10.21924/cst.7.1.2022.727.

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Nowadays, electronic products are being used extensively in many fields and applications. The dense population of electronic devices in human life has become a challenge for microwave engineers to ensure that their products can meet the Electromagnetic Compatibility (EMC) standards. Complex electronic products with smaller sizes and denser components will be a challenge for compliance with EMC standards. In addition, the occurrence of non-stationary emission at certain operating modes becomes a challenge for analysis. Error in analyzing EM emissions will make the products unable to meet the requirements of EMC standards; hence, they will be prohibited to be marketed. Currently, there are two methods of emission analysis, i.e. by measurement and modeling or computation. There are some problems, however, in the analysis of EM emissions regarding the area of test, complexity, DUT positioning error, installation cost, and time consumption. In this paper, the analysis techniques for EM emissions including Open Area Test Site (OATS), Anechoic chamber, Transverse Electromagnetics TEM Cell, Compact Antenna Test Range (CATR) and near field scanning are reviewed comprehensively. This survey covered EMC standards, principles of EM emission measurement techniques, advantages and disadvantages of EM emission measurement techniques, studies and applications of each technique, recommendations for which technique to be used, and challenges for future research in EM emission measurement. The final section of this paper discusses the challenges for near-field measurements related to the non-stationary emissions phenomenon. This papers also presents the challenges of how to detect and characterize them.

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4

Krafft, C., and P. Savoini. "Fundamental Electromagnetic Emissions by a Weak Electron Beam in Solar Wind Plasmas with Density Fluctuations." Astrophysical Journal Letters 924, no. 2 (January 1, 2022): L24. http://dx.doi.org/10.3847/2041-8213/ac46a7.

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Abstract The generation of Langmuir wave turbulence by a weak electron beam in a randomly inhomogeneous plasma and its subsequent electromagnetic radiation are studied owing to two-dimensional particle-in-cell simulations in conditions relevant to type III solar radio bursts. The essential impact of random density fluctuations of average levels of a few percents of the background plasma on the characteristics of the electromagnetic radiation at the fundamental plasma frequency ω p is shown. Not only wave nonlinear interactions but also processes of Langmuir waves’ transformations on the density fluctuations contribute to the generation of such emissions. During the beam relaxation, the amount of electromagnetic energy radiated at ω p in a plasma with density fluctuations strongly exceeds that observed when the plasma is homogeneous. The fraction of Langmuir wave energy involved in the generation of electromagnetic emissions at ω p saturates around 10−4, i.e., one order of magnitude above that reached when the plasma is uniform. Moreover, whereas harmonic emission at 2ω p dominates over fundamental emission during the time evolution in a homogeneous plasma, fundamental emission is strongly dominant when the plasma contains density fluctuations, at least during several thousands of plasma periods before being overcome by harmonic emission when the total electromagnetic energy begins to saturate.

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5

Pilipenko, Vyacheslav, Eugeny Fedorov, Nikolay Mazur, and Stanislav Klimov. "Electromagnetic pollution of near-Earth space by power line emission." Solar-Terrestrial Physics 7, no. 3 (September 28, 2021): 105–13. http://dx.doi.org/10.12737/stp-73202107.

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We present an overview, based on satellite observations at low Earth orbits, on electromagnetic radiation from ground power transmission lines at an industrial frequency 50–60 Hz. Particular attention has been given to Chibis-M and DEMETER satellite observations. The electric 40-cm antenna of the micro-satellite often recorded 50–60 Hz radiation (known as Power Line Emission (PLE)) when it flew over industrialized areas of the planet. The PLE spectral amplitude varied from 1.2 to 18 (μV/m)/Hz0.5, which corresponds to the electric field amplitude E~1 μV/m. We report results of numerical calculations of the electromagnetic response of the atmosphere and ionosphere to a large-scale surface emitter at a frequency of 50 Hz. According to simulation results, PLE with an intensity of ~1 μV/m observed on satellites in the nightside ionosphere at midlatitudes can be excited by an unbalanced current 8–10 A in a power transmission line above the earth's crust with conductivity of 10–3 S/m. At middle and low latitudes with an inclined geomagnetic field, the maximum response in the upper ionosphere to the transmission line radiation should be seen shifted equatorward, although this shift is less than that upon guidance by the geomagnetic field. The maximum amplitude of the electromagnetic response of the ionosphere to the power transmission line emission decreases for an inclined geomagnetic field, but insignificantly. To date, the PLE intensity in near-Earth space has turned out to be higher than the intensity of natural radiation in this range (Schumann resonances and ion whistlers), and continues to grow with the technological development of mankind.

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6

Liu, Yang, Cai-Ping Lu, and Heng Zhang. "Mutation effect of acoustic and electromagnetic emissions of hard rock impact failure." International Journal of Distributed Sensor Networks 15, no. 1 (January 2019): 155014771882447. http://dx.doi.org/10.1177/1550147718824473.

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To reveal acoustic emission and electromagnetic emission effects during hard rock impact failure is a crucial issue for monitoring and warning rockburst risk induced by hard roof fracture and fall. The presented research focuses on acoustic emission and electromagnetic emission and microseismic effects detected during laboratory tests and by in situ multi-parameter observations, and the field observations agreed satisfactorily with the experimental evidences. The following main conclusions were drawn: (1) the stress level, frequency of micro-cracks, and impact failure regularity of hard rocks can be revealed with electromagnetic emission and acoustic emission/microseismic parameters, respectively; (2) acoustic emission/microseismic event counts can directly reveal the cracks change in rocks, and the initiation, propagation, and coalescence of micro-cracks can be presented as first increase, followed by decrease in acoustic emission/microseismic event counts; (3) in most cases, only when stress suddenly decreases or the rock final collapses, acoustic emissions show obviously abnormal; and (4) acoustic emission/microseismic can be more effectively applied to warn rockburst danger. The above conclusions may shed light on the effective monitoring and warning methods of rockburst triggered by hard roof fall, and events contribute to some interpretations to originally transient precursors of hard rock fracturing.

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7

Bilki, Burak, Kamuran Dilsiz, Hasan Ogul, Yasar Onel, David Southwick, Emrah Tiras, James Wetzel, and David Roberts Winn. "Secondary Emission Calorimetry." Instruments 6, no. 4 (September 21, 2022): 48. http://dx.doi.org/10.3390/instruments6040048.

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Electromagnetic calorimetry in high-radiation environments, e.g., forward regions of lepton and hadron collider detectors, is quite challenging. Although total absorption crystal calorimeters have superior performance as electromagnetic calorimeters, the availability and the cost of the radiation-hard crystals are the limiting factors as radiation-tolerant implementations. Sampling calorimeters utilizing silicon sensors as the active media are also favorable in terms of performance but are challenged by high-radiation environments. In order to provide a solution for such implementations, we developed a radiation-hard, fast and cost-effective technique, secondary emission calorimetry, and tested prototype secondary emission sensors in test beams. In a secondary emission detector module, secondary emission electrons are generated from a cathode when charged hadron or electromagnetic shower particles penetrate the secondary emission sampling module placed between absorber materials. The generated secondary emission electrons are then multiplied in a similar way as the photoelectrons in photomultiplier tubes. Here, we report on the principles of secondary emission calorimetry and the results from the beam tests performed at Fermilab Test Beam Facility as well as the Monte Carlo simulations of projected, large-scale secondary emission electromagnetic calorimeters.

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8

Kubiak, Ireneusz, and Artur Przybysz. "Fourier and Chirp-Z Transforms in the Estimation Values Process of Horizontal and Vertical Synchronization Frequencies of Graphic Displays." Applied Sciences 12, no. 10 (May 23, 2022): 5281. http://dx.doi.org/10.3390/app12105281.

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The electromagnetic protection of IT devices includes a number of organizational and technical measures aimed at ensuring control over radiated and conducted revealing emissions. This is of particular importance for ensuring information security in wireless communication and the processing of data presented in graphic form. In each of these cases, the occurring electromagnetic emissions pose the risk of a lack of electromagnetic immunity to the so-called eavesdropping process based on forming revealing emissions. Included in the elements of the security chain preventing electromagnetic eavesdropping on wireless communication and the devices building such systems are activities related to the determination of the Technical Device Security Level (TDSL) or its class. The above is related to the performance of electromagnetic emissions tests and identifying which of them must be treated as revealing emissions, which are only disturbances and do not threaten the security of the processed information. It is intuitively understandable that it is particularly important to ensure the security of interfaces that process video data. The nature of the electromagnetic emission signals generated by these interfaces means that the related information can be intercepted with the use of relatively simple methods, and under favorable circumstances even with the use of a receiving device not very technologically advanced. In the case of the electromagnetic safety assessment of video devices, common practice is therefore activities aimed at reconstructing information related to the video signal. This requires the parameters of the reconstructed image appropriate for the eavesdropped device operation mode and the conditions of recording the revealing emission signals to be determined. The article presents the results of works related to the analysis of the possibility of using spectral analysis methods (Fast Fourier FFT transform and Chirp-Z transform) to automate the process of determining the above-mentioned parameters in the case of reproducing images from emission signals recorded by using the ADC analog-to-digital converter.

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9

Riga, Jeanne, and Rebecca Seviour. "Electromagnetic analogs of quantum mechanical tunneling." Journal of Applied Physics 132, no. 20 (November 28, 2022): 200901. http://dx.doi.org/10.1063/5.0118308.

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In this paper, we introduce the theoretical framework underlying our proposed methodology of verification and validation (V&V) for quantum mechanical emission models using analogous macroscopic electromagnetic systems. We derive the correspondence between quantum mechanics and electromagnetism using the transfer matrix approach and describe the electromagnetic analog that will be used to anchor the atomistic quantum tunneling simulations. Finally, we illustrate this correspondence by comparing the quantum mechanical and electromagnetic systems for some simple, analytically soluble examples and outline future V&V work based on the framework presented here.

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10

Li, Yanchu, Qingqing Ding, Keyue Li, Stanimir Valtchev, Shufang Li, and Liang Yin. "A Survey of Electromagnetic Influence on UAVs from an EHV Power Converter Stations and Possible Countermeasures." Electronics 10, no. 6 (March 17, 2021): 701. http://dx.doi.org/10.3390/electronics10060701.

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It is inevitable that high-intensity, wide-spectrum electromagnetic emissions are generated by the power electronic equipment of the Extra High Voltage (EHV) power converter station. The surveillance flight of Unmanned Aerial Vehicles (UAVs) is thus, situated in a complex electromagnetic environment. The ubiquitous electromagnetic interference demands higher electromagnetic protection requirements from the UAV construction and operation. This article is related to the UAVs patrol inspections of the power line in the vicinity of the EHV converter station. The article analyzes the electromagnetic interference characteristics of the converter station equipment in the surrounding space and the impact of the electromagnetic emission on the communication circuits of the UAV. The anti-electromagnetic interference countermeasures strive to eliminate or reduce the threats of electromagnetic emissions on the UAV’s hardware and its communication network.

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11

Zhao, Fujun, Yu Li, Zhouyuan Ye, Yong Fan, Siping Zhang, Haifan Wang, and Yonghong Liu. "Research on Acoustic Emission and Electromagnetic Emission Characteristics of Rock Fragmentation at Different Loading Rates." Shock and Vibration 2018 (2018): 1–8. http://dx.doi.org/10.1155/2018/4680879.

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The relationships among the generation of acoustic emission, electromagnetic emission, and the fracture stress of rock grain are investigated, which are based on the mechanism of acoustic emission and electromagnetic emission produced in the process of indenting rock. Based on the relationships, the influence of loading rate on the characteristics of acoustic emission and electromagnetic emission of rock fragmentation is further discussed. Experiment on rock braking was carried out with three loading rates of 0.001 mm/s, 0.01 mm/s, and 0.1 mm/s. The results show that the phenomenon of acoustic emission and electromagnetic emission is produced during the process of loading and breaking rock. The wave forms of the two signals and the curve of the cutter indenting load show jumping characteristics. Both curves have good agreement with each other. With the increase of loading rate, the acoustic emission and electromagnetic emission signals are enhanced. Through analysis, it is found that the peak count rate, the energy rate of acoustic emission, the peak intensity, the number of pulses of the electromagnetic emission, and the loading rate have a positive correlation with each other. The experimental results agree with the theoretical analysis. The proposed studies can lead to an in-depth understanding of the rock fragmentation mechanism and help to prevent rock dynamic disasters.

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12

Luo, Yu, Jingjing Zhang, Lixin Ran, Hongsheng Chen, and Jin Au Kong. "Controlling the Emission of Electromagnetic Source." PIERS Online 4, no. 7 (2008): 795–800. http://dx.doi.org/10.2529/piers071229161355.

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13

Sikula, Josef, J. Majzner, P. Sedlak, and Yasuhiko Mori. "Electromagnetic and Acoustic Emission Fine Spectra." Advanced Materials Research 13-14 (February 2006): 169–74. http://dx.doi.org/10.4028/www.scientific.net/amr.13-14.169.

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A new measuring method for the detection of fine spectra of electromagnetic and acoustic emission (EME and AE) signals from small cracks is described. It requires wide band ultra-low noise amplifiers, analogue filters, the optimization of signal to noise ratio of sensors and the application of noise elimination methods. Analyses of noise sources in sensors and preamplifiers are given. They are thermal noise, polarization noise and low frequency 1/f noise. Measuring set-up background noise suppression involving also the electromagnetic shielding allows us to detect signals in the range of 1 to 100 nV. This measuring set-up was used to observe crack initiation in granite samples. AE and EME signals show different behaviour in the first interval of about 20 μs just after crack initiation. For the first stage of crack initiation the frequency spectrum of EME signal is given by the eigen vibrations of crack walls, by the internal friction and the sample electrical conductivity. We observed that the crack opening and crack wall vibration create the high frequency signal in the frequency band up to 10 MHz. These signals were observed in the first time interval of about 20 μs. After that the frequency spectrum is given by the sample eigen vibration or the sample boundary conditions, and we have observed the spectra in the frequency range 100 kHz to 2 MHz.

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14

Giusti, C., and F. D. Pacati. "Polarization in electromagnetic two-nucleon emission." Nuclear Physics A 699, no. 1-2 (February 2002): 57–64. http://dx.doi.org/10.1016/s0375-9474(01)01470-1.

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15

Sarma, K. K., S. N. Sarma, M. Nambu, and T. Hada. "Electromagnetic emission due to nonlinear forces." Physical Review A 43, no. 10 (May 1, 1991): 5555–59. http://dx.doi.org/10.1103/physreva.43.5555.

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16

Ziebell, L. F., P. H. Yoon, L. T. Petruzzellis, R. Gaelzer, and J. Pavan. "PLASMA EMISSION BY NONLINEAR ELECTROMAGNETIC PROCESSES." Astrophysical Journal 806, no. 2 (June 22, 2015): 237. http://dx.doi.org/10.1088/0004-637x/806/2/237.

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17

Sarma, S. N., K. K. Sarma, M. Nambu, and U. N. Das. "Electromagnetic emission in a magnetized plasma." Radiophysics and Quantum Electronics 37, no. 5 (May 1994): 344–54. http://dx.doi.org/10.1007/bf01045685.

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18

Gao, Feng, Chengkai Ye, Zilong Wang, and Xu Li. "Improvement of Low-Frequency Radiated Emission in Electric Vehicle by Numerical Analysis." Journal of Control Science and Engineering 2018 (October 1, 2018): 1–8. http://dx.doi.org/10.1155/2018/5956973.

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In this paper, a methodology for improving vehicle-level radiated electromagnetic interference (EMI) in electric vehicle (EV) is proposed. This methodology predicts vehicle-level radiated EMI by using the multiport network theory, based on analyzing the contribution from each electronic component to find out the main EMI source. To validate its effectiveness, the proposed methodology is applied in an actual EV for low-frequency radiated emissions. Simulation in a commercially available electromagnetics software and measurement in the EV are combined to predict the vehicle-level emissions, and then the electronic component with the greatest EMI that causes failure to meet the EMC standard is identified. After improving this component, the vehicle-level radiated emission is reduced to comply with the EMC standard, proving that the presented numerical method is effective. The proposed methodology can also be used in other EMC issues, regardless of the amount of interference sources and sensitive equipment.

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19

Treumann, R. A., R. Nakamura, and W. Baumjohann. "A model of so-called "Zebra" emissions in solar flare radio burst continua." Annales Geophysicae 29, no. 9 (September 29, 2011): 1673–82. http://dx.doi.org/10.5194/angeo-29-1673-2011.

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Abstract. A simple mechanism for the generation of electromagnetic "Zebra" pattern emissions is proposed. "Zebra" bursts are regularly spaced narrow-band radio emissions on the otherwise broadband radio continuum emitted by the active solar corona. The mechanism is based on the generation of an ion-ring distribution in a magnetic mirror geometry in the presence of a properly directed field-aligned electric potential field. Such ion-rings or ion-conics are well known from magnetospheric observations. Under coronal conditions they may become weakly relativistic. In this case the ion-cyclotron maser generates a number of electromagnetic ion-cyclotron harmonics which modulate the electron maser emission. The mechanism is capable of switching the emission on and off or amplifying it quasi-periodically which is a main feature of the observations.

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20

Chu, Cheng, and J. L. Sperling. "Electromagnetic fluctuations from energetic particles in plasmas." Journal of Plasma Physics 40, no. 3 (December 1988): 407–17. http://dx.doi.org/10.1017/s0022377800013398.

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Electromagnetic fluctuations, induced by energetic charged particles, are calculated using correlation techniques for a uniform magnetized plasma. Power emission in the ion-cyclotron range of frequencies (ICRF) is calculated for a specific model of velocity distribution function. The emissive spectra are distinct from that of the black-body radiation and have features that are consistent with experimental observation.

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21

Xu, W., and C. Zhang. "Electrical Generation of Spontaneous Optical Emission in Electrically Modulated Two-Dimensional Electron Gases at Low-Temperatures." International Journal of Modern Physics B 12, no. 05 (February 20, 1998): 579–90. http://dx.doi.org/10.1142/s021797929800034x.

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A detailed theoretical study is presented for spontaneous optical emission from a two-dimensional electron gas (2DEG) in the presence of a unidirectional spatially periodic modulation at low temperatures. The momentum- and energy-balance equations for electron–photon interactions in the device system are solved self-consistently using the Boltzmann equation, from which we can obtain the frequency and the intensity of the electromagnetic radiation generated. The results obtained indicate that: (1) in an electrically modulated 2DEG at low temperatures, a strong electromagnetic radiation emission up to W/cm2 can be generated by applying a small d.c. electric field; (2) the radiation emission is generated indirectly in the occupied subbands through electronic transitions around the Fermi level; (3) the frequency of the radiation generated is at about 0.1 THz; (4) in the low frequency regime, spontaneous multiphoton emissions can be observed; and (5) this type of optical emission depends strongly on the sample parameters such as the electron density of the 2DEG and the modulation length.

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22

Balachandran, R., N. Prepagaran, O. Rahmat, A. B. Zulkiflee, and K. S. Hufaida. "Effects of Bluetooth device electromagnetic field on hearing: pilot study." Journal of Laryngology & Otology 126, no. 4 (February 6, 2012): 345–48. http://dx.doi.org/10.1017/s0022215112000047.

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AbstractBackground:The Bluetooth wireless headset has been promoted as a ‘hands-free’ device with a low emission of electromagnetic radiation.Objective:To evaluate potential changes in hearing function as a consequence of using Bluetooth devices, by assessing changes in pure tone audiography and distortion production otoacoustic emissions.Design:Prospective study.Materials and methods:Thirty adult volunteers were exposed to a Bluetooth headset device (1) on ‘standby’ setting for 6 hours and (2) at full power for 10 minutes. Post-exposure hearing was evaluated using pure tone audiography and distortion production otoacoustic emission testing.Results:There were no statistically significant changes in hearing, as measured above, following either exposure type.Conclusion:Exposure to the electromagnetic field emitted by a Bluetooth headset, as described above, did not decrease hearing thresholds or alter distortion product otoacoustic emissions.

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23

Grach, S. M., V. M. Fridman, L. M. Lifshits, T. S. Podstrigach, E. N. Sergeev, and S. D. Snegirev. "<i>Letter to the Editor</i> UHF electromagnetic emission stimulated by HF pumping of the ionosphere." Annales Geophysicae 20, no. 10 (October 31, 2002): 1687–91. http://dx.doi.org/10.5194/angeo-20-1687-2002.

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Abstract. UHF electromagnetic emission (with a frequency near 600 MHz) from the F-region of the ionosphere pumped by an HF powerful radio wave is revealed. Possible mechanisms of the emission excitation, such as plasma mode con-version, scattering or Earth thermal noise emission off the plasma density irregularities, bremsstrahlung and excitation of high Rydberg states of the neutral particles by the accelerated electrons are discussed.Key words. Ionosphere (active experiments; wave-particle interactions) – Solar physics, astrophysics, and astronomy (radio emissions)

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24

Wang, Wen Cai, Hui Zhao, Hong Yu Zhao, and Qing Tian Zhang. "Characters of Electromagnetic Radiation in Coal and its Application in Forecast of Coal and Gas Outburst." Advanced Materials Research 962-965 (June 2014): 1051–55. http://dx.doi.org/10.4028/www.scientific.net/amr.962-965.1051.

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The coal can produce electromagnetic radiation when it is in the loading process. The electromagnetic radiation characteristics testing to the sample in the process of uniaxial compression failure in the lab shows that loading stress and the strength of electromagnetic radiation, the number of electromagnetic radiation pulse, the number of acoustic emission pulse are positively correlated relationship when it is in the loading process. They usually have a good corresponding relationship with each other, but are not completely synchronization. They test the corresponding relationship between the electromagnetic radiation intensity of coal and main parameters gas emission initial speed of traditional prediction of coal and gas outburst borehole and amount of drilling cuttings. The results show that the electromagnetic radiation intensity and gas emission initial speed of borehole and amount of drilling cuttings have a positive correlation, and the linear positive correlation equation is obtained. Thus it can be seen, electromagnetic radiation characteristics can be used for predicting the outburst of coal and gas.

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25

Shcherbakov I.P., Afanaseva E.V., Dunaev A.A., Eronko S.B., Kadomtsev A.G., Narykova M.V., and Chmel A.E. "Variation of the micromechanics of impact fracture of MgAl-=SUB=-2-=/SUB=-O-=SUB=-4-=/SUB=- in response to the applied hot isostatic pressing." Physics of the Solid State 64, no. 10 (2022): 1483. http://dx.doi.org/10.21883/pss.2022.10.54239.377.

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The MgAl2O4 ceramics produced by the preliminary clinkering of synthesized powder was exposed to the hot isostatic pressing (HIP). Samples were subjected to a pointed impact loading, which excited the acoustical and electromagnetic emissions (AE and EME, respectively). In non-HIP-treated samples, the energy distribution in time series of AE and EME pulses followed an exponential law, while after an application of the hot isostatic pressing procedure, the emissions of both types exhibited the power law energy distributions in time sweeps. A variation of the specificity of the impact-induced AE/EME energy release was explained by a transition from the nucleation/decay of microcracks in non-HIP-treated ceramics to the self-organized dislocation folding directed to grain boundaries in the material characterized by the density that was close to that of a MgAl2O4 single crystal. Keywords: MgAl2O4 ceramics, hot isostatic pressing, impact loading, acoustic emission, electromagnetic emission.

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Mastrogiannis, D., V. Hadjicontis, and C. Mavromatou. "Experimental evidence of the compatibility of the cumulative electromagnetic energy release data, with the hierarchical models for the catastrophic fracturing process." Natural Hazards and Earth System Sciences 11, no. 6 (June 6, 2011): 1605–8. http://dx.doi.org/10.5194/nhess-11-1605-2011.

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Abstract. In this paper, we performed experiments of uniaxial compression of granite samples and recorded time series of electromagnetic pulses during the evolution of the catastrophic fracturing process. The cumulative energy release of the electromagnetic emission (EME) up to the critical point at the moment of rupture was then calculated. It was shown, that the validity of the proposed hierarchy models for the catastrophic fracturing process of composite materials, in analogy to critical phenomena, can be experimentally established not only via acoustic emission data, but via electromagnetic emission data as well. The above conclusion could be a useful tool for the improvement of the earthquake prediction method, based on precursory electromagnetic signals.

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Peng, He Meng, Quan Di Wang, and Yong Ming Yang. "Electromagnetic Radiation Emission Model of Motor Drive System." Applied Mechanics and Materials 764-765 (May 2015): 501–5. http://dx.doi.org/10.4028/www.scientific.net/amm.764-765.501.

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The electromagnetic radiation emission model of motor drive System for electric vehicles (EVs) is presented in this paper. First, the radiation electromagnetic interference (EMI) mechanism of the motor drive system is analyzed and investigated by experiment. The radiation EMI mainly comes from the common mode current flowing along the three phase cable between the inverter and the motor. Secondly, the feasibility of the finite element method (FEM) is verified by calculating the wire electromagnetic field around and the radiation EMI model of the motor drive system is established using the FEM. The simulation and experimental results show that the proposed model is feasible.

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Луковенкова, О. О., Е. И. Малкин, М. А. Мищенко, and А. А. Солодчук. "Anomalies in electromagnetic and geoacoustic emission signals." Вестник КРАУНЦ. Физико-математические науки, no. 1 (April 24, 2021): 137–49. http://dx.doi.org/10.26117/2079-6641-2021-34-1-137-149.

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В работе рассматриваются предсейсмические аномалии сигналов электромагнитного излучения в диапазоне очень низких частот (ОНЧ) и геоакустической эмиссии, зарегистрированных на Камчатке в 2013 году. Выявлены признаки возникновения аномальных возмущений в исследуемых сигналах и особенности их проявления. Проведен совместный анализ предсейсмических аномалий в сигналах электромагнитного ОНЧ-излучения и геоакустической эмиссии методом наложения эпох. Представлены оценки вероятности возникновения таких аномалий в рассматриваемых геофизических сигналах. The paper considers pre-seismic anomalies in the signals of electromagnetic radia-tion in a very low frequency range and geoacoustic emission recorded in Kamchatka in 2013. Signs of anomaly occurrence in the studied signals and peculiarities of their manifestation were revealed. Using the epoch folding method, joint analysis of the detected pre-seismic electro-magnetic and geoacoustic anomalies was carried out. The estimates of occurrence probability for such amomalies of the considered geophysical fields are presented.

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FUKUI, Katsunori, Seisuke OKUBO, and Takafumi TERASHIMA. "Electromagnetic Wave Emission in Uniaxial Compression Testing." Shigen-to-Sozai 117, no. 9 (2001): 703–10. http://dx.doi.org/10.2473/shigentosozai.117.703.

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Misicu, S., M. Rizea, and W. Greiner. "Emission of electromagnetic radiation in α-decay." Journal of Physics G: Nuclear and Particle Physics 27, no. 5 (March 28, 2001): 993–1003. http://dx.doi.org/10.1088/0954-3899/27/5/304.

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Rueda, J. A., R. Ruffini, Y. Wang, C. L. Bianco, J. M. Blanco-Iglesias, M. Karlica, P. Lorén-Aguilar, R. Moradi, and N. Sahakyan. "Electromagnetic emission of white dwarf binary mergers." Journal of Cosmology and Astroparticle Physics 2019, no. 03 (March 29, 2019): 044. http://dx.doi.org/10.1088/1475-7516/2019/03/044.

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32

Thompson, Christopher. "Impulsive Electromagnetic Emission near a Black Hole." Astrophysical Journal 874, no. 1 (March 21, 2019): 48. http://dx.doi.org/10.3847/1538-4357/aafda3.

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Ahmed, Mosabbah Mushir, David Hely, Nicolas Barbot, Romain Siragusa, Etienne Perret, Maxime Bernier, and Fredric Garet. "Radiated Electromagnetic Emission for Integrated Circuit Authentication." IEEE Microwave and Wireless Components Letters 27, no. 11 (November 2017): 1028–30. http://dx.doi.org/10.1109/lmwc.2017.2750078.

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Shukla, P. K., L. Stenflo, and D. P. Resendes. "Enhanced electromagnetic emission from a dusty plasma." Physics of Plasmas 9, no. 3 (March 2002): 1043–45. http://dx.doi.org/10.1063/1.1446878.

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Sovey, James S., Lynnette M. Carney, and Steven C. Knowles. "Electromagnetic emission experiences using electric propulsion systems." Journal of Propulsion and Power 5, no. 5 (September 1989): 534–47. http://dx.doi.org/10.2514/3.23187.

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Sol, H. "Non-Electromagnetic Emission of Active Galactic Nuclei." EAS Publications Series 1 (2001): 27–32. http://dx.doi.org/10.1051/eas:2001006.

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Tirsky, V. V., and V. G. Ledenev. "Electromagnetic emission polarization of turbulent magnetized plasma." Physica Scripta 75, no. 3 (January 25, 2007): 245–49. http://dx.doi.org/10.1088/0031-8949/75/3/002.

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Koktavy, P., J. Pavelka, and J. Sikula. "Characterization of acoustic and electromagnetic emission sources." Measurement Science and Technology 15, no. 5 (April 21, 2004): 973–77. http://dx.doi.org/10.1088/0957-0233/15/5/028.

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Grach, S. M., M. M. Shvarts, E. N. Sergeev, and V. L. Frolov. "Broad continuum feature of stimulated electromagnetic emission." Journal of Atmospheric and Solar-Terrestrial Physics 60, no. 12 (January 1998): 1233–46. http://dx.doi.org/10.1016/s1364-6826(98)00051-0.

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Steele, James, Hidenaga Yamagishi, and Ismail Zahed. "Electromagnetic emission rates and spectral sum rules." Nuclear Physics A 638, no. 1-2 (August 1998): 495c—498c. http://dx.doi.org/10.1016/s0375-9474(98)00339-x.

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Mackersie, J., R. Hill, and A. Cowking. "Models for acoustic and electromagnetic Barkhausen emission." NDT & E International 24, no. 1 (February 1991): 42. http://dx.doi.org/10.1016/0963-8695(91)90725-i.

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Salnikov, V., V. Popov, and D. Terre. "Electromagnetic emission in mineral and rock dehydration." IOP Conference Series: Earth and Environmental Science 33 (March 2016): 012052. http://dx.doi.org/10.1088/1755-1315/33/1/012052.

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Abdullaev, F. Kh, and A. A. Abdumalikov. "Emission of Electromagnetic Waves by a Ereather." physica status solidi (b) 145, no. 2 (February 1, 1988): K131—K134. http://dx.doi.org/10.1002/pssb.2221450252.

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44

Bazhenova, E. A., N. A. Beloglazova, and A. G. Vdovin. "Determination Of Lunar-Solar Deformation Processes In The Geomedium Volume In The Conditions Of Megapolis." IOP Conference Series: Earth and Environmental Science 929, no. 1 (November 1, 2021): 012012. http://dx.doi.org/10.1088/1755-1315/929/1/012012.

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Abstract The paper describes a new borehole hardware-software complex designed for synchronous registration of geoacoustic emission signals, electromagnetic radiation, temperature and borehole device rotation angle. The results of regime measurements with the new equipment in megapolis conditions are shown. The analysis of the obtained data is performed. The spectral-time analysis of regime measurements of geoacoustic emission and electromagnetic radiation signals registered in the borehole at a depth of 274 m was carried out. In the spectra of signals of electromagnetic radiation and geoacoustic emission the main diurnal and semidiurnal deformation tidal processes of known physical nature were identified.

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Karlický, Marian, and Miroslav Bárta. "Electromagnetic emission by subsequent processes L→L'+S and L+L'→T." Proceedings of the International Astronomical Union 6, S274 (September 2010): 252–54. http://dx.doi.org/10.1017/s174392131100706x.

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AbstractUsing a 2.5-D electromagnetic particle-in-cell (PIC) model, very early stages of a generation of the electromagnetic emission produced by a monochromatic Langmuir wave are studied. It is found that the electromagnetic emission, which is dominant on the harmonic of the plasma frequency, starts to be generated in a very small region of k-vectors. Later on the k-vectors of this emission are scattered around a ‘circle’ (in our 2-D case), given by the relations for the L+L'→T process. Analytical analysis of two subsequent processes L→L'+S a L+L'→T confirms these results.

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Sharma, Sumeet Kumar, Vishal S. Chauhan, and Michael Sinapius. "A review on deformation-induced electromagnetic radiation detection: history and current status of the technique." Journal of Materials Science 56, no. 7 (November 19, 2020): 4500–4551. http://dx.doi.org/10.1007/s10853-020-05538-x.

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AbstractDevelopment of the deformation monitoring techniques for the infrastructures so as to avoid catastrophic failure and resulting economic/human loss has remained a key interest of scientists and engineers. Among various deformation monitoring techniques utilized and explored by groups of researchers, electromagnetic radiation detection is one of the intriguing techniques which has remained popular in researchers’ community till today. Almost every type of material is being explored and studied by researchers for the electromagnetic emissions when subjected to external loading and/or failure. Experimental and theoretical investigations are demonstrating these emissions to be a suitable candidate for the deformation monitoring, as a failure predictor and to know about the complex phenomenon of fracture. This article presents extensive literature review and a rigorous discussion on the work done in the past several decades regarding the exploration of electromagnetic emissions from a wide variety of materials and the underlying physical mechanisms. Thus, this review is an attempt to highlight main findings, proposed physical mechanisms, prospective applications, future scope and challenges of the electromagnetic emission detection technique.

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Khorsov, Petr, Nikolay Khorsov, and Vladimir Surzhikov. "Control of Defects on the Parameters of the Electromagnetic Response under Pulsed Mechanical Excitation of the Sample." Advanced Materials Research 1085 (February 2015): 316–18. http://dx.doi.org/10.4028/www.scientific.net/amr.1085.316.

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The paper assessed the possibility of using acoustic emission from the dielectric sample during stepwise loading. The electromagnetic signal from the sample was detected by using an apparatus of mechanical repeatedly pulsed excitation of the sample at each stage of loading. It was found that the response consists of a deterministic component (due to the excitation pulse) and random components noise and acoustic emission. It were allocated random components, calculated their standard deviations. The influence of the electromagnetic emission on standard deviation of the random component of response under step load on the specimen was evaluated. It has been shown that the component of the electromagnetic emission can be an informative parameter to evaluate defectiveness of the object of a dielectric material under load.

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48

Juhl, B., and R. A. Treumann. "VLF emission stimulated by parallel electric fields." Journal of Plasma Physics 34, no. 1 (August 1985): 47–66. http://dx.doi.org/10.1017/s0022377800002671.

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We study the influence of a weak quasi-static parallel electric field on the stability of electromagnetic plasma waves. Using an operator calculus to solve the Boltzmann-Maxwell equations we derive a dispersion relation for the electromagnetic waves. Assuming that the electrons have a loss-cone distribution, the real frequency of waves in the whistler band is not changed by the presence of the electric field. Resonant interaction damps the HF waves for propagation parallel to the electric field. In the case of opposite propagation, a new HF excitation is found at frequencies ω ≲ ωce The width of the excitation region depends on the width of the loss cone, field strength and collision frequency. This result is applied to observations of the splitting of VLF emissions under natural conditions in the magnetosphere. It is found that the observed splitting could have been caused by the presence of the weak parallel electric field of a kinetic (shear) Alfvén wave in the emission region, which is quasi-stationary compared with the growth of the observed VLF emission.

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Kachakhidze, M. K., Z. A. Kereselidze, N. K. Kachakhidze, G. T. Ramishvili, and V. J. Kukhianidze. "In connection with identification of VLF emissions before L'Aquila earthquake." Natural Hazards and Earth System Sciences 12, no. 4 (April 16, 2012): 1009–15. http://dx.doi.org/10.5194/nhess-12-1009-2012.

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Abstract. The present paper deals with an attempt to check the theoretical model of self-generated seismo-electromagnetic oscillations of LAI system on the basis of retrospective data. Application of the offered simple model enables one to explain qualitatively the mechanism of VLF electromagnetic emission initiated in the process of an earthquake preparation. Besides, the model enables us to associate telluric character geoelectric and geomagnetic perturbations incited by rock polarization and self-generated electromagnetic oscillations of lithosphere-atmosphere system. L'Aquila earthquake taken as an example to isolate reliably the Earth VLF emission from the magnetospheric electromagnetic emission of the same frequency range, MHD criterion is offered together with geomagnetic activity indexes. On the basis of the considered three earthquakes, according to the opinion of authors the model of self-generated seismo-electromagnetic oscillations of the LAI system will enable us to approach the problem of resolution of earthquake prediction with certain accuracy.

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Щербаков, И. П., А. A. Дунаев, and А. Е. Чмель. "Эмиссионная активность при ударном разрушении керамик A-=SUB=-2-=/SUB=-B-=SUB=-6-=/SUB=-." Письма в журнал технической физики 44, no. 15 (2018): 58. http://dx.doi.org/10.21883/pjtf.2018.15.46441.16971.

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AbstractIn this paper, we present results of a study of the generation of electromagnetic emission during impact loading of ZnS and ZnSe ceramics prepared by various techniques. The choice of the type of mechanical action is associated with the typical applications of these ceramics. Separate contributions to emission activity from the dislocations movement and the microcracks development depending on the crystallite size in the ceramics are shown. The electromagnetic emission is compared with parallel time series of pulses of mechanoluminescence and acoustic emission. In all three cases, emission activity was recorded with a time resolution of 10 ns.

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