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Journal articles on the topic 'EMF method'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Wei, Kai Xia. "Numerical Solution for Weight Function of Electromagnetic Flowmeter Using Finite Element Method." Applied Mechanics and Materials 444-445 (October 2013): 1360–63. http://dx.doi.org/10.4028/www.scientific.net/amm.444-445.1360.

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Weight function is related with the sensor structure of electromagnetic flowmeter (EMF). Because of complex boundary conditions, it is difficult to solve the voltage differentiation equation of EMF directly to get weight function. The finite element numerical analysis method is tried to solve the weight function for the point and large-electrode EMF in this paper. The results prove it is feasible and efficient to obtain weight function of EMA by means of finite element numerical analysis.

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Shklyarova, A. N., E. V. Tsukanova, M. N. Starodubtseva, and I. A. Cheshik. "Lymphocyte cytoskeleton reorganization caused by a short-term action of an extremely low frequency electromagnetic field (50 Hz) on the blood in vitro." Health and Ecology Issues, no. 4 (December 28, 2020): 92–98. http://dx.doi.org/10.51523/2708-6011.2020-17-4-13.

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Objective: to detect changes in the parameters of the structure and mechanical properties of the surface layer of lymphocytes in the blood of a rat after a single action (30 min and 2 h) of an extremely low frequency electromagnetic field (ELF EMF) on the rat`s whole blood in vitro.Material and methods. We exposed the whole blood of a Wistar rat (4.5 months) to the effect of ELF EMF (50 Hz, B = 0.79 mT), generated by an experimental setup based on a Helmholtz coil. Lymphocytes were isolated from the blood using the Histopaque-1077 density gradient sedimentation method, then were placed on the

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Tyagushcheva, Anna Anatoiyevna, Grigory Anatolievich Kupin, and Vladimir Nikolaevich Aleshin. "STUDYING THE INFLUENCE OF THE DEGREE OF MATURITY, STORAGE PARAMETERS AND PROCESSING METHOD ON THE TECHNOCHEMICAL INDICATORS OF ZUCCHINS." Fruit growing and viticulture of South Russia 2, no. 86 (2024): 188–203. http://dx.doi.org/10.30679/2219-5335-2024-2-86-188-203.

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The work shows the results of the influence of the degree of maturity, storage parameters and processing method on the techno-chemical parameters of zucchini. Thus, during the organoleptic assessment of zucchini of different degrees of maturity, stored at a temperature of 8 to 10 ºC for 18 days, it was found that ELF EMF treatment allows maintaining organoleptic quality indicators. At the same time, the average expert assessment score for zucchini of the 1st degree of maturity treated with ELF EMF was the maximum. The maximum weight loss was observed in zucchini of the 1st degree of maturity,

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Migault, Lucile, Ronan Garlantezec, Clément Piel, et al. "O1B.6 Maternal cumulative exposure to extremely low frequency electromagnetic fields, prematurity and bith weight: a pooled analysis of two birth cohorts." Occupational and Environmental Medicine 76, Suppl 1 (2019): A6.2—A6. http://dx.doi.org/10.1136/oem-2019-epi.17.

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BackgroundData on the effects of extremely low frequency electromagnetic fields (ELF-EMF) on pregnancy outcomes are inconclusive.ObjectivesTo study the relation between maternal cumulative exposure to ELF-EMF during pregnancy and the risk of prematurity or small for gestational age in a pooled analysis of two French birth cohorts.MethodsElfe and Epipage2 are both population-based birth cohorts initiated in 2011 and included 18 329 and 8400 births respectively. Health data and household, mother and child characteristics were obtained from medical records, by face-to-face interview at maternity,

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Zarrin, Farzaneh, Seyed Mohammad Mahdavi, Amir Modarresi Chahardehi, Zahra Razzaghi, and Nayebali Ahmadi. "The Effect of Time-Dependence of 10 Hz Electromagnetic Field on Spatial Learning and Memory in Rats." Journal of Lasers in Medical Sciences 13 (December 12, 2022): e64. http://dx.doi.org/10.34172/jlms.2022.64.

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Introduction: In everyday life, electrical devices are the primary sources of extremely low-frequency electromagnetic fields (ELF-EMF), and the human body may be a great conductor of these fields. We chose alpha band power, especially at 10 Hz frequency, due to its prior beneficial role in memory. The purpose was to clarify whether there is a relationship between ELF-EMF exposure and cognitive deficits in rats, clinical signs, behavioral analysis, and the impact of ELF-EMF during different times of exposure on neuroplasticity via the expression of BDNF. Methods: Forty adult male rats were sele

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Novaldi Ramdani Reza, Rovino Alghafari, Errisa Zulqa Deswana, Muhammad Rifqi, and Diyajeng Luluk Karlina. "Pemanfaatan Medan Elektromagnetik dalam Teknologi Pengobatan Modern." Mars : Jurnal Teknik Mesin, Industri, Elektro Dan Ilmu Komputer 2, no. 6 (2024): 52–61. http://dx.doi.org/10.61132/mars.v2i6.496.

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The utilization of electromagnetic fields (EMF) in modern medical technology has become a significant focus of research. This study aims to explore the therapeutic effects of EMF, especially at low frequencies (ELF) and Pulsed Electromagnetic Fields (PEMF), in enhancing the healing of various medical conditions. The method used is a literature study by analyzing various sources from Google Scholar, Science Direct, and PubMed. The results showed that EMF therapy is effective in relieving pain, accelerating tissue healing, and improving the quality of life of patients with musculoskeletal disord

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Abdimuratov, Zh S., Zh D. Manbetova, M. N. Imankul, K. S. Chezhimbayeva, and A. Zh Sagyndikova. "METHODS FOR PROTECTING THE EQUIPMENT OF CELLULAR (MOBILE) CONNECTION FROM ELECTROMAGNETIC IMPACT." PHYSICO-MATHEMATICAL SERIES 335, no. 1 (2021): 81–89. http://dx.doi.org/10.32014/2021.2224-5294.12.

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Under electromagnetic impact (EMI) of a sufficient level, temporary disruption of functioning, processing, transmission and storage of information in cellular equipment is possible. Possible problems of electromagnetic compatibility (EMC) of a mobile phone and a base station (BS) of cellular connection under the influence of electromagnetic radiation (EMR) from other sources and their negative impact on functioning are considered. The energy of the HF electromagnetic field (EMF) after passing through the protective case can affect the devices of shielded radio electronic equipment (REE), there

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Abdimuratov, Zh S., Zh D. Manbetova, M. N. Imankul, K. S. Chezhimbayeva, and A. Zh Sagyndikova. "METHODS FOR PROTECTING THE EQUIPMENT OF CELLULAR (MOBILE) CONNECTION FROM ELECTROMAGNETIC IMPACT." PHYSICO-MATHEMATICAL SERIES 335, no. 1 (2021): 81–89. http://dx.doi.org/10.32014/2021.2518-1726.12.

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Under electromagnetic impact (EMI) of a sufficient level, temporary disruption of functioning, processing, transmission and storage of information in cellular equipment is possible. Possible problems of electromagnetic compatibility (EMC) of a mobile phone and a base station (BS) of cellular connection under the influence of electromagnetic radiation (EMR) from other sources and their negative impact on functioning are considered. The energy of the HF electromagnetic field (EMF) after passing through the protective case can affect the devices of shielded radio electronic equipment (REE), there

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9

Almarhoon, Ali, Yuan Ren, and Z. Q. Zhu. "Influence of back-EMF and current harmonics on sensorless control performance of single and dual three-phase permanent magnet synchronous machines." COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering 35, no. 2 (2016): 744–63. http://dx.doi.org/10.1108/compel-12-2015-0441.

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Purpose – The purpose of this paper is to investigate the influence of back-EMF and current harmonics on position and speed estimation accuracy for single and dual three-phase (DTP) permanent magnet synchronous machines (PMSMs) with two fundamental-model-based sensorless control strategies which are widely utilized for AC machines, i.e. flux-linkage observer (FO) and simplified extended Kalman filter (EKF). Design/methodology/approach – The effect of distorted back-EMF is studied for sensorless vector control of single three-phase PMSM. For the influence of current harmonics, unlike the existi

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10

Li, Zi Cheng, Zi Yu Ou, and Shan Mei Cheng. "Rotor Position Phase Correction for Sensorless Brushless DC Motor Based on Line Back EMF." Advanced Materials Research 347-353 (October 2011): 607–10. http://dx.doi.org/10.4028/www.scientific.net/amr.347-353.607.

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This paper proposes a novel rotor position estimation method based on line back EMF for brushless DC motor (BLDCM). The relationship between position phase error and the symmetric line back EMF is analyzed. It is noted that line back EMF error can exactly reflect rotor position phase error. If the amplitude of line back EMF at the beginning of commutation is equal to the amplitude of line back EMF at the end of commutation, the waveform of line back EMF should be symmetric. Based on the above analysis, a closed loop control method to correct rotor position phase is presented. Line back EMF err

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Mrs., Babita, and Jitendra Singh Bhadoriya Mr. "A NOVEL APPROACH TO IMPROVE THE CHARACTERISTIC OF A SENSORLESS BLDC MOTOR USING CONTROL STRATEGY." International Journal of Advances in Engineering & Scientific Research, Vol.4,, Issue 2, Feb-Apr-2017, (2017): pp 31–48. https://doi.org/10.5281/zenodo.570108.

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This Research work represent an improved direct back EMF detection method .It is desirable in any kind of machine to use a method which is less dependable on the sensors and complex circuits, so in this paper a sensor less method is used to commutate and trigger the inverter connected to BLDC motor. A low pass filter arrangement with comparator is used for detection of back EMF with hall effect sensors. Hall effect signals gives the information of the operations in the BLDC motor in this work hall effect signals are used for the gate pulses for the inverter. In this research work rotor positio

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Hu, Yunxin, Shiyu Jiang, Zifan Huang, et al. "Optical characterization sensing method of TFBG sensor for battery electromotive force monitoring." Optics Express 32, no. 16 (2024): 28914. http://dx.doi.org/10.1364/oe.524031.

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In the past few years, fiber optic sensors have demonstrated an amazing ability to detect the state of charge (SOC) and electromotive force (EMF) inside a battery in real-time. However, it remains an enormous challenge to characterize the relationship between the spectral shift of the fiber sensor and the internal EMF change of the battery. Here, we propose a method to monitor the electrolyte during the battery discharge process using the integral spectrum of a tiny tilted fiber Bragg grating (TFBG) sensor. The relationship between the fiber optic transmission spectrum and battery EMF was esta

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Mrs., Babita1, and Jitendra Singh Bhadoriya2 Mr. "A NOVEL APPROACH TO IMPROVE THE CHARACTERISTIC OF A SENSORLESS BLDC MOTOR USING CONTROL STRATEGY." International Journal of Advances in Engineering & Scientific Research 4, no. 2 (2017): 31–48. https://doi.org/10.5281/zenodo.10774888.

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<strong>Abstract</strong><strong>: </strong>                                This Research work represent an improved direct back EMF detection method .It is desirable in any kind of machine to use a method which is less dependable on the sensors and complex circuits, so in this paper a sensor less method is used to commutate and trigger the inverter connected to BLDC motor. A low pass filter arrangement with comparator is used for detection of back EM

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14

Thakur, Anant. "Improvement of Back EMF & Minimization of Torque Ripple of BLDC Motor." SMART MOVES JOURNAL IJOSCIENCE 5, no. 8 (2019): 1–7. http://dx.doi.org/10.24113/ijoscience.v5i8.220.

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In Brushless DC (BLDC) motor minimized the torque ripple with the help of electronically based commutators. When torque ripple is minimizes then copper loss is also minimizes. In this paper, our main aspect to decrease the torque ripples & improved the back emf of brushless dc (BLDC) motor. This paper shows that the torque produced by the BLDC motors with trapezoidal Back EMF is constant under ideal condition. Due to freewheeling torque ripples are produced which is reduced. In this paper rotor position is determined by the Zero Crossing Detection (ZCD) of back emf. Unlike old methods of c

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15

Wei, Kai Xia, Shu Long Gu, and Long Qing He. "Solving Weight Function for the Partially Filled Pipe Electromagnetic Flowmeter by Means of Finite Element Numerical Analysis." Advanced Materials Research 550-553 (July 2012): 3395–99. http://dx.doi.org/10.4028/www.scientific.net/amr.550-553.3395.

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The weight function method that uses a known weight function has been a general tool for the signal analysis of the electromagnetic flowmeter(EMF). However, it is difficult to solve the voltage equation directly by analytical method in order to get weight function for the partially filled pipe electromagnetic flowmeter(EMF-PF). The finite element numerical analysis method is tried to solve the weight function for the EMF-PF in this paper. The results show that weight function for EMF-PF relates to fill height of liquid in partially filled pipes, and there is a nonlinear function relationship b

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Petrova-Burkina, O. A., V. V. Rubanik Jr., and V. V. Rubanik. "Thermokinetic EMF during a reverse phase transition in titanium nickelide as a way of information recording." Proceedings of the National Academy of Sciences of Belarus, Physical-Technical Series 66, no. 3 (2021): 329–34. http://dx.doi.org/10.29235/1561-8358-2021-66-3-329-334.

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The external factors that inﬂuence on the thermokinetic EMF value in the Ti – 50 at.% Ni samples were determined. A method for setting thermokinetic EMF in certain sections of the TiNi wire was developed. The thermokinetic EMF value was measured directly using a digital millivoltmeter MNIPI V7-72. The sections of the Ti – 50 at.% Ni wire samples were subjected to tensile tests on a tensile machine IP 5158-5. On the basis of calorimetric studies, the kinetics of martensitic transformations was investigated. It was found that the direct phase transition affects the thermokinetic EMF value of the

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Stankevych, G., Yu Kovra, and A. Kats. "INFLUENCE OF ELECTROMAGNETIC FIELD OF EXTREMELY LOW FREQUENCIES ON HYGROSCOPIC PROPERTIES OF WHEAT GRAIN MASS." Grain Products and Mixed Fodder’s 21, no. 1 (2021): 9–14. http://dx.doi.org/10.15673/gpmf.v21i1.2088.

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The research results of the influence of electromagnetic field (EMF) of extremely low frequencies (ELF) on hygroscopic properties of Shestopalivka wheat variety of 2019 harvest have been given. Grain processing was performed on the experimental stand that consisted of the polymeric cylindrical container for grain, solenoid coil, generator of electromagnetic waves GZ-112/1 and a power amplifier of low frequency. The output signal of generator was set in the form of sine wave and controlled by oscillograph C1-78. The studies were performed at EMF frequencies of 10, 16, 24 and 30 Hz. Magnetic ind

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Bryukhan, Fedor, and Mariya Amirkhanyan. "Technogenic electromagnetic impact zones of electric grid facilities." MATEC Web of Conferences 193 (2018): 02017. http://dx.doi.org/10.1051/matecconf/201819302017.

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Introduction of technogenic physical fields including electromagnetic fields (EMF) to the environment can have an adverse impact on both humans and environment. Development of safety tools protecting against EMF impact involves studying their intensity and assessing EMF spatial extent. This paper proposes a definition of an EMF technogenic impact zone (TIZ) concept based on the instruments lower sensitivity threshold. The paper gives the results of EMF TIZ width assessment based on the measurements of EMF electric and magnetic components intensity generated by power line communication (PLC) al

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Lider, Andrey M., Vitalii V. Larionov, and Maxim S. Syrtanov. "Hydrogen Concentration Measurements at Titanium Layers by Means of Thermo-EMF." Key Engineering Materials 683 (February 2016): 199–202. http://dx.doi.org/10.4028/www.scientific.net/kem.683.199.

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The thermo-emf and electrical resistivity of hydrogenated titanium were measured. Hydrogen concentration in titanium varies from 0.005 to 0.25%. We have compared the methods regarding their sensitivity to the alteration of thermo-emf and electrical resistivity during titanium hydrogenation. The accuracy of the obtained results was verified by comparing them with the results for palladium. It was demonstrated that the method implementing thermo-emf is sensitive to hydrogen concentration in titanium at different depth of the alloy. On the basis of performed measurements, we have proposed a graph

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Zhao, Ying, and Yong Jun Yang. "Modeling and Simulation of Brushless DC Motor with Nonideal Back EMF." Applied Mechanics and Materials 130-134 (October 2011): 3434–37. http://dx.doi.org/10.4028/www.scientific.net/amm.130-134.3434.

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The back electromotive force (EMF) waveform of brushless dc motor (BLDCM) is trapezoid. But it is not absolutely trapezoid because of motor manufacturing. In this paper, a method of modeling for BLDCM with nonideal back EMF is presented. Eighteen states during an electric angle cycle are obtained after the nonideal back EMF of BLDCM is analyzed. The S-Function of MATLAB is used to generate the nonideal back EMF according to rotor speed and position. The pulse width modulation (PWM) current control of BLDCM is adopted. Simulated results validate the method.

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Turuban, Maxime, Hans Kromhout, Javier Vila, et al. "Occupational exposure to radiofrequency electromagnetic fields and brain tumor risk: Application of the INTEROCC job‐exposure matrix." International Journal of Cancer 156, no. 3 (2024): 538–51. https://doi.org/10.1002/ijc.35182.

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AbstractRadiofrequency electromagnetic fields (RF‐EMF, 100 kHz to 300 GHz) are classified by IARC as possibly carcinogenic to humans (Group 2B). This study evaluates the potential association between occupational RF‐EMF exposure and brain tumor risk, utilizing for the first time, a RF‐EMF job‐exposure matrix (RF‐JEM) developed in the multi‐country INTEROCC case–control study. Cumulative and time‐weighted average (TWA) occupational RF‐EMF exposures were estimated for study participants based on lifetime job histories linked to the RF‐JEM using three different methods: (1) by considering RF‐EMF

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Yildirim, Merve, Hasan Kurum, Damijan Miljavec, and Selma Corovic. "Influence of Material and Geometrical Properties of Permanent Magnets on Cogging Torque of BLDC." Engineering, Technology & Applied Science Research 8, no. 2 (2018): 2656–62. https://doi.org/10.5281/zenodo.1257483.

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Aim of this study is to investigate the influence of both material and geometrical properties of surface mounted permanent magnets (PM) on cogging torque of a brushless DC motor (BLDC) by means of numerical modeling based on finite element method (FEM). To this end, a 2D numerical model of the BLDC motor is built by using the software package Ansys Maxwell. In this study, we analyze the machine properties in no excitation mode (i.e. no stator current is applied) and calculate the distribution of magnetic flux density within the entire motor, the magnetic flux density in the air gap, the coggin

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Nalli, Rajesh, K. Subbarao, M. Ramamoorthy, and M. Kiran Kumar. "A Novel Sensorless Controlling Technique of a 3-Phase Brushless DC Motor for Industrial Application." Journal of Computational and Theoretical Nanoscience 16, no. 12 (2019): 5032–41. http://dx.doi.org/10.1166/jctn.2019.8560.

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This paper provides the novel sensorless control technique of a 3-phase BLDC motor. The introduction to the conventional sensorless techniques like Back emf detection, free-wheeling diode detection technique, back emf third harmonic detection techniques are discussed. Conventional sensorless technique has its drawbacks like high frequency noise, having more number of switches in free-wheeling diode detection method causes more switching losses. Wrong estimation rotor position in back emf zero detection technique where the floating phase back emf is consider for commutation estimation. In all t

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Imamaliyeva, S. Z., I. F. Mehdiyeva, D. B. Taghiyev, and M. B. Babanly. "Thermodynamic investigations of the erbium tellurides by EMF method." Physics and Chemistry of Solid State 21, no. 2 (2020): 312–18. http://dx.doi.org/10.15330/pcss.21.2.312-318.

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The work presents the results of a thermodynamic study of the Er-Te system by the method of electromotive forces (EMF) in the temperature range of 300-450 K. From the EMF measurements of the concentration cells relative to the Er and ErTe electrodes, the partial thermodynamic functions of ErTe and Er in the alloys are determined, based on which the standard thermodynamic formation functions and the standard entropies of the intermediate compounds ErTe3, Er2Te3, and ErTe are calculated. A comparative analysis of the obtained data with the literature is carried out.

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Sheng, Guorui, Tiegang Gao, and Shun Zhang. "Detection of Content-Aware Image Resizing for Forensic Applications." International Journal of Digital Crime and Forensics 6, no. 2 (2014): 23–39. http://dx.doi.org/10.4018/ijdcf.2014040102.

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Seam-Carving is widely used for content-Aware image resizing. To cope with the digital image forgery caused by Seam-Carving, a new detecting algorithm based on Expanded Markov Feature (EMF) is presented. The algorithm takes full advantage of Transition Probability Matrix to represent correlation change caused by Seam-Carving operation. Different with traditional Markov features, the EMF not only reflects the change of correlation within the intra-DCT block, it also represents the change of correlation in more extensive range. The EMF is a fusion of traditional and expanded Markov Transition Pr

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Chen, Kelu, Huakun Zhou, Bingbing Lu, et al. "Single-Species Artificial Grasslands Decrease Soil Multifunctionality in a Temperate Steppe on the Qinghai–Tibet Plateau." Agronomy 11, no. 11 (2021): 2092. http://dx.doi.org/10.3390/agronomy11112092.

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Artificial grasslands have been regarded as an effective method to improve grass production and quality, especially on the Qinghai–Tibet Plateau. Soil ecosystem multifunctionality (EMF) plays an important role in sustainable regional development. However, few studies have investigated the impacts of artificial grasslands on soil EMF. Here, we constructed single-species artificial grasslands in a natural temperate steppe and investigated soil microbial communities, abiotic factors (soil moisture and pH), and functions related to biogeochemical cycles to explore (1) how the transformation from t

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Cheng, Bingheng, Hongyan Liu, Juan Bai, and Jinhua Li. "Soil Fungal Composition Drives Ecosystem Multifunctionality after Long-Term Field Nitrogen and Phosphorus Addition in Alpine Meadows on the Tibetan Plateau." Plants 11, no. 21 (2022): 2893. http://dx.doi.org/10.3390/plants11212893.

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An ecosystem can provide multiple functions and services at the same time, i.e., ecosystem multifunctionality (EMF). Above- and belowground biodiversity and abiotic factors have different effects on EMF. Human activities increase atmospheric nitrogen (N) and phosphorus (P) deposition, but the mechanism of how atmospheric N and P deposition affect EMF in alpine meadows on the Tibetan Plateau is still unclear. Here, we measured eleven ecosystem parameters to quantify EMF by averaging method and explored the impact of plant and microbial species diversity and abiotic factors on EMF after long-ter

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Singatulin, Roman S., and Alexandr V. Sapryka. "Experimental studies results of electromagnetic field effect of dielcometer system to increase the yield of greenhouse crops." E3S Web of Conferences 176 (2020): 03011. http://dx.doi.org/10.1051/e3sconf/202017603011.

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The article presents experimental studies of the application of electromagnetic technologies for impact on biological objects. Tomato seeds were chosen as experimental biological objects. For the study, the technological parameters of EMF were obtained using the method of full factor experiment. Laboratory and field studies were carried out. In laboratory studies, the results of EMF effects on chromosomal aberrations of tomato seeds were obtained. Dependencies of chromosomal aberrations in tomato seeds on changes in seeds EMF exposure, EMF frequency, and EMF power flow density were given. In f

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Akay, Ali, and Paul Lefley. "Torque Ripple Reduction Method in a Multiphase PM Machine for No-Fault and Open-Circuit Fault-Tolerant Conditions." Energies 14, no. 9 (2021): 2615. http://dx.doi.org/10.3390/en14092615.

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This paper presents a method that has been developed to reduce the torque ripples under healthy and open-circuit fault-tolerant (OCFT) conditions for a multiphase permanent magnet (PM) machine. For smooth torque, both the phase current and the back electromotive force (back-EMF) should be purely sinusoidal. To improve the torque in a multiphase machine, higher-order current harmonics are injected, which are related to the harmonics in the back-EMF. For this reason, generally, multiphase machines are designed with higher-order back-EMF harmonics. However, these harmonics produce ripples in the

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Jesus, Luiz Henrique Reis de, Geyverson Teixeira de Paula, and Leonardo da Cunha Brito. "On-load Back-EMF Optimization Based on the Back-EMF MST Method and Parametric Optimization." Journal of Microwaves, Optoelectronics and Electromagnetic Applications 18, no. 3 (2019): 358–76. http://dx.doi.org/10.1590/2179-10742019v18i31511.

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Wang, Li Huo, Wei Yao, and Wei Zhang. "A Fridge Compressor Control System Based on MC56F8013." Advanced Materials Research 383-390 (November 2011): 6019–24. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.6019.

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This paper describes Freescale company’s DSP device MC56F8013 implementation of a fridge compressor control system about BLDC motors without position sensors, which includes motor starting and back EMF running. The motor start-up detects the variation of rotor position according to inductance of stator core. Then when the rotor is accelerated to a certain speed, EMF mode is switched. The EMF mode estimates the rotor position by back EMF zero-crossing detection method. The experiment results prove that the proposed system based on MC56F8013 can work normally and efficiently, and guarantee the d

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Gül, Mehmet, Mehmet Cihan Yavaş, and Serkan Dündar. "Protective effect of Melatonin and Ganoderma lucidum against the negative effects of extremely low frequency electric and magnetic fields in the periodontal tissues." International Dental Research 9, no. 3 (2019): 119–26. http://dx.doi.org/10.5577/intdentres.2019.vol9.no3.5.

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Aim:The purpose of this study was to determine whether extremely low frequency electric and magnetic field (ELF-EMF) had any detrimental effects on periodontal tissue and to investigate, histologically and immunohistochemically whether melatonin (MLT) and Ganoderma lucidum (GL) had a protective role against these detrimental effects. Methodology:A total of 56 adults, male Wistar Albino rats were used in this study. Rats were divided into 7 equal groups and exposed to ELF-EMF, which was produced by a high voltage source, 8 hours / day for 26 days. GL (20 mg / kg / day) and MLT (10 mg / kg

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Abdullayev, A. M., A. I. Zhukov, S. V. Maryokhin, and S. D. Riabchykov. "Engineering Margin in Calculations of Energy Release in VVER-1000 core." Nuclear and Radiation Safety, no. 2(78) (June 7, 2018): 20–26. http://dx.doi.org/10.32918/nrs.2018.2(78).03.

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A method for calculating the engineering margin factor (EMF) in calculations of the energy release in the core of VVER-1000 reactors is proposed in the paper. The analysis of various approaches in the calculation of EMF is carried out and various factors influencing EMF and the ways of their consideration —deterministic and statistical — are determined. The main attention is paid to the influence of gaps between the fuel assemblies on the energy release of fuel rods and the contribution of this factor to the EMF. The limitations and conservatism of two-dimensional small-scale calculations of t

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Orujlu, Elnur N., Ziya S. Aliev, Yasin I. Jafarov, Eldar I. Ahmadov, and Mahammad B. Babanly. "Thermodynamic study of manganese tellurides by the electromotive force method." Kondensirovannye sredy i mezhfaznye granitsy = Condensed Matter and Interphases 23, no. 2 (2021): 273–81. http://dx.doi.org/10.17308/kcmf.2021.23/3438.

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The thermodynamic properties of manganese tellurides were determined using an electromotive force (EMF) method with a liquid electrolyte in a temperature range from 300 to 450 K. EMF measurements were performed using equilibrium samples taken from the two-phase regions, namely MnTe2 + Te and MnTe + MnTe2, of the Mn–Te system. The phase compositions of all samples were controlled with the X-ray diffraction (XRD) method. The partial molar functions of manganese in alloys, as well as the standard thermodynamic functions of the formation and standard entropies of MnTe and MnTe2, were calculated. A

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Gao, Caixia, Yanjie Nie, Jikai Si, Ziyi Fu, and Haichao Feng. "Mode Recognition and Fault Positioning of Permanent Magnet Demagnetization for PMSM." Energies 12, no. 9 (2019): 1644. http://dx.doi.org/10.3390/en12091644.

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This paper proposes a demagnetization fault detection, mode recognition, magnetic pole positioning, and degree evaluation method for permanent magnet synchronous motors. First, the analytical model of the single-coil no-load back electromotive force (EMF) of demagnetization fault for Permanent magnet synchronous motor (PMSM) arbitrary magnetic poles is established. In the analytical model, the single-coil no-load back EMF residual of the health state and the single magnetic pole sequential demagnetization fault are calculated and normalized. Model results are used as the fault sample database.

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Cao, Xiangang, Yu Ye, Yong Duan, Yuze Wu, and Xin Yang. "Sensorless control of permanent magnet synchronous motor based on adaptive back-EMF observer." Advances in Mechanical Engineering 15, no. 2 (2023): 168781322311516. http://dx.doi.org/10.1177/16878132231151622.

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Aiming at the problem that the change of motor parameters in actual operation will significantly reduce the control accuracy of the motor, this paper proposes a sensorless control method of permanent magnet synchronous motor based on an adaptive back-EMF observer. Firstly, in the sensorless vector control algorithm, the mathematical model of the permanent magnet synchronous motor based on the coordinate axis transformation is established, online identification of permanent magnet synchronous motor flux linkage, and the adaptive back EMF observer is constructed. The parameters update the motor

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Marinkovic, Branko, Miroslav Grujic, Dusko Marinkovic, et al. "Use of biophysical methods to improve yields and quality of agricultural products." Journal of Agricultural Sciences, Belgrade 53, no. 3 (2008): 235–42. http://dx.doi.org/10.2298/jas0803235m.

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Until as recently as a century ago, the exposure of biological systems to radiation was limited only to the natural sources. Today, however, a broad range of radiation types and doses have found a wide variety of uses and applications, so much so that it would be difficult to make a list of all the areas of human activity in which radiation is used for one purpose or another. The study of radiation effects on individuals and populations as a whole has become important only with the development of methods and sources of man-made radiation. Given that what is present in this case are physical ef

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Abba, Faiza, and M’hemed Rachek. "Time-Stepping FEM-Based Multi-Level Coupling of Magnetic Field–Electric Circuit and Mechanical Structural Deformation Models Dedicated to the Analysis of Electromagnetic Actuators." Actuators 8, no. 1 (2019): 22. http://dx.doi.org/10.3390/act8010022.

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The present paper introduced a framework for multi-level coupling transient electromagnetic fields (EMF) and mechanical structural dynamics based on the finite element method (FEM). This framework was dedicated to predicting, with better accuracy, the wave magnetic force density for obtaining the mechanical deformation occurring in electromagnetic actuators (EMAs). The first-level EMF transient model coupling is related to the magnetic field equations that are strongly coupled with the electric circuit input voltage equations. This is done by considering the magnetic saturation through the New

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Zhang, Hua Qiang, Xin Sheng Wang, and Fei Fei Wang. "An Improved Estimation Method of Permanent Magnet Synchronous Motor without Position Sensor." Advanced Materials Research 159 (December 2010): 616–21. http://dx.doi.org/10.4028/www.scientific.net/amr.159.616.

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On the basis of interior electromagnetism relationship and vector control principle, the vector control system of Permanent Magnet Synchronous Motor (PMSM) without position sensor is designed. There are two main identification methods are introduced to estimate the position and speed of PMSM. One scheme is based on the back Electromotive Force (EMF) and the other is Model Reference Adaptive Standard (MRAS). The former method achieves fast dynamic-state response while the later method obtains better steady-state performance. According to both of them advantages, an improved estimate method whic

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Qi, Zhao, Shen Xing-Quan, Yu Da-Guo, and Yuan Bin. "The Research of EMF Zero-crossing Detection Method." Procedia Engineering 15 (2011): 2474–78. http://dx.doi.org/10.1016/j.proeng.2011.08.465.

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Ottøy, Magnar, Tormod Førland, Signe Kjelstrup Ratkje, and Steffen Møller-Holst. "Membrane transference numbers from a new emf method." Journal of Membrane Science 74, no. 1-2 (1992): 1–8. http://dx.doi.org/10.1016/0376-7388(92)87067-8.

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Otobe, H., M. Akabori, and Y. Arai. "Oxygen potential measurements of Cm0.09Pu0.91O2−xby EMF method." IOP Conference Series: Materials Science and Engineering 9 (March 1, 2010): 012015. http://dx.doi.org/10.1088/1757-899x/9/1/012015.

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Pankajavalli, R., and O. M. Sreedharan. "Thermodynamic stability of HfMo2O8 by the emf method." Journal of Nuclear Materials 175, no. 3 (1990): 194–96. http://dx.doi.org/10.1016/0022-3115(90)90206-3.

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Yu, Linxin, and Dazhi Wang. "A Hybrid Filtering Stage-Based Rotor Position Estimation Method of PMSM with Adaptive Parameter." Sensors 21, no. 14 (2021): 4667. http://dx.doi.org/10.3390/s21144667.

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The performance of sensorless control in a permanent magnet synchronous machine (PMSM) highly depends on the accuracy of rotor position estimation. Owing to its strong robustness, phase-locked loop (PLL) is widely used in rotor position estimation. However, due to the influence of harmonics existing in back electromotive force (EMF), estimation error occurs by using PLL. In this paper, a hybrid filtering stage-based PLL is proposed to improve the rotor position estimation. Adaptive notch filters and moving average filters are integrated together to eliminate harmonic EMF. To make the method ef

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Sun, Chuanhui, and Yufa Xu. "Multiobjective Optimization Design of a Brushless Excitation Synchronous Motor Based on the Taguchi Method." Journal of Physics: Conference Series 2644, no. 1 (2023): 012001. http://dx.doi.org/10.1088/1742-6596/2644/1/012001.

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Abstract Considering the issue of significant total harmonic distortion in the no-load back electromotive force (EMF) and torque ripple of a brushless excitation synchronous motor (BESM) used in a compressor, a multiobjective optimization design method of a BESM based on the Taguchi method was proposed. By selecting the polar arc coefficient, stator slot width, damping winding pitch, and air gap length as the optimization parameters, the maximum no-load back EMF, minimum back EMF total harmonic distortion rate, and minimum torque ripple are selected as the optimization objectives. Then, the Ta

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Xiao, Dianxun, Kun Hu, and Chengrui Li. "Transmission Line Modeling-Based Position Sensorless Control for Permanent Magnet Synchronous Machines." Electronics 14, no. 2 (2025): 271. https://doi.org/10.3390/electronics14020271.

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Position sensorless control has been widely used in permanent magnet synchronous motor (PMSM) drives in low-cost applications or in the fault-tolerance control of position sensors. Conventional sensorless control methods often adopt a back electromagnetic force (EMF)-based position observer, which results in bandwidth reduction in signal processing and lower estimation accuracy. This paper introduces a numerical solution based on transmission line modeling (TLM) to obtain the back EMF. The TLM method is used for the numerical calculation of electromagnetics due to the clear algorithm structure

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Pokhodzey, L. V., Yu P. Paltsev, and E. A. Rudneva. "ELECTROMAGNETIC CONDITIONS HYGIENIC ASSESSMENT AT WORKPLACES WITH PERSONAL COMPUTERS: HISTORY AND PRESENT STATUS." Hygiene and sanitation 98, no. 11 (2019): 1196–200. http://dx.doi.org/10.18821/0016-9900-2019-98-11-1196-1200.

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Introduction. Currently, in force hygienic normative-methodical documents (SanPiN 2.2.2/2.4.1340-03, SanPiN 2.2.2/2.4.2620-10, SanPiN 2.2.4.3359-16) do not allow to objectively estimating EMF on modern workplaces of personal computers (PCs) users by and other means of information and communication technologies (ICT). Aim of the study is scientific substantiation of improvement of normative-methodical documentation on hygienic regulation and evaluation of EMF in computerized workplaces using modern ICT. Material and methods. The analytical method of evaluation of modern normative-methodical doc

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Wang, Song Lin, and Shun Yi Xie. "Adaptive Sliding Mode Observer for Back-EMF in Direct Torque Control of Brushless DC Motor." Advanced Materials Research 850-851 (December 2013): 572–75. http://dx.doi.org/10.4028/www.scientific.net/amr.850-851.572.

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The key issue of feedback torque calculation in BLDCM-DTC system is how to get the accurate estimation of back-emf. The influences form the deviation of resistance and inductance on traditional back-emf sliding mode observer (SMO) and relevant torque observation results are analyzed. To advance the accuracy of the torque estimation, an adaptive sliding mode observer is designed to estimate the back-emf of the BLDCM and then get torque estimation from the back-emf estimation. The proposed sliding mode observer can also implement the online identification of the stator resistance and inductance

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Penteado de Almeida, Juliano, Zachary Stoll, and Pei Xu. "An Alternating, Current-Induced Electromagnetic Field for Membrane Fouling and Scaling Control during Desalination of Secondary Effluent from Municipal Wastewater." Water 15, no. 12 (2023): 2234. http://dx.doi.org/10.3390/w15122234.

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Membrane treatment of secondary effluent for reuse applications is a promising approach to expand water supplies and provide flexibility to water resources management. However, effective control of membrane fouling and scaling is crucial for cost-effective treatment and system resilience. This study compared the performance of antiscalants to an alternating, current-induced electromagnetic field (EMF) as an alternative pretreatment method to reverse osmosis. Compared to the no-EMF control experiments, the EMF device resulted in 13% higher water recovery and 366% lower flux decline at 60% of wa

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Szemerszky, Renáta, Zsuzsanna Dömötör, and Ferenc Köteles. "One Single Question Is not Sufficient to Identify Individuals With Electromagnetic Hypersensitivity." Clinical Psychology in Europe 1, no. (4) (2019): e35668. https://doi.org/10.32872/cpe.v1i4.35668.

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<b>Background</b>: Idiopathic Environmental Intolerance attributed to Electromagnetic Fields (IEI-EMF) is a self-reported condition where non-specific symptoms are attributed to weak non-ionizing electromagnetic fields. Despite its expanding prevalence, there is no generally accepted diagnostic procedure or definition to identify patients with this condition, thus studies usually apply only one question as inclusion criterion. The aim of our study was to demonstrate the heterogeneity of a self-reported IEI-EMF group and to identify further self-report questions that could be applied as inclusi

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