Relevant bibliographies by topics / EMF method

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'EMF method'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "EMF method"

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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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Migault, Lucile, Ronan Garlantezec, Clément Piel, Laetitia Marchand-Martin, Sébastien Orazio, Marie Cheminat, Cécile Zaros, 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 (April 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, and completed during follow-up. A recently updated job-exposure-matrix (JEM) was used to assess cumulative exposure to ELF-EMF during three periods: 1) until 15, 2) until 28 and 3) until 32 weeks of gestation. Analyses were restricted to single live births in mainland France and to mothers with documented jobs (n=19,894). Differences in selection frame between the two cohorts were controlled using a propensity score weighting method. We used multiple imputation method to deal with missing data. Logistic regression models adjusted for the main potential confounders were used.ResultsAccording to the period studied, 3.2% to 4% of mothers were classified as highly exposed to ELF-EMF. An increased risk of spontaneous prematurity was observed among the most exposed groups in period 2 and period 3. Overall, no consistent association with small for gestational age was found.ConclusionThis study, with substantial statistical power provides evidence of a possible association between cumulative exposure to ELF-EMF during pregnancy and the risk of spontaneous prematurity.
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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 (February 10, 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), therefore, the possible negative consequences of the impact of high-energy EMF on the REE are described. Possible negative consequences under certain conditions from the influence of the skin-effect, the effects of electrostatic discharge and electromagnetic pulses on electronic devices are given. It is shown that the constructional method of protecting REE from the effects of external electromagnetic factors consists in reducing the collected and transmitted EMF energy by improving the design, placement and installation of equipment. Components of some vendors for 5G systems that are resistant to external interference are given, and the possibilities for reducing the radiation level of a cell phone are noted. The necessity of an integrated approach to solving EMC problems is substantiated, which consists in the use of structural, circuitry and structural-functional methods of EMC provision. The new 5G (Fifth Generation) standard will operate at higher operating frequencies compared to previous generations. Due to the workload of the electromagnetic spectrum at frequencies below 6 GHz, 5G networks will be based on wireless radio access systems operating at frequencies of 30–100 GHz, that is, in the lower band of the extremely high frequency range EHF (Extremely High Frequency), 30–300 GHz.
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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 (February 8, 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), therefore, the possible negative consequences of the impact of high-energy EMF on the REE are described. Possible negative consequences under certain conditions from the influence of the skin-effect, the effects of electrostatic discharge and electromagnetic pulses on electronic devices are given. It is shown that the constructional method of protecting REE from the effects of external electromagnetic factors consists in reducing the collected and transmitted EMF energy by improving the design, placement and installation of equipment. Components of some vendors for 5G systems that are resistant to external interference are given, and the possibilities for reducing the radiation level of a cell phone are noted. The necessity of an integrated approach to solving EMC problems is substantiated, which consists in the use of structural, circuitry and structural-functional methods of EMC provision. The new 5G (Fifth Generation) standard will operate at higher operating frequencies compared to previous generations. Due to the workload of the electromagnetic spectrum at frequencies below 6 GHz, 5G networks will be based on wireless radio access systems operating at frequencies of 30–100 GHz, that is, in the lower band of the extremely high frequency range EHF (Extremely High Frequency), 30–300 GHz.
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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 (March 7, 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 existing literature where the current harmonics are deliberately injected, in this paper, sensorless switching-table-based direct torque control (ST-DTC) strategies for DTP-PMSM which inherently suffer from non-sinusoidal stator currents in addition to the distorted back-EMF, are investigated experimentally. Findings – By employing the FO and simplified EKF-based sensorless vector control of single three-phase PMSM, it can be concluded that the rotor position estimation accuracy is less affected by the back-EMF harmonics when the simplified EKF method is utilized since it is less sensitive to such noises. When the influence of non-sinusoidal stator currents together with back-EMF harmonics is investigated for the conventional and modified ST-DTC of DTP-PMSM, it is indicated that the simplified EKF exhibits better position and speed estimation accuracy in both the conventional and modified ST-DTC strategies. In addition, its steady-state performance shows a slight superiority over that based on FO, in terms of flux and torque ripples, and THD of phase currents. For the dynamic performance, the estimated speed of simplified EKF shows less phase lag and fluctuations compared to that of FO. Originality/value – This paper introduces the influence of back-EMF and current harmonics on sensorless control performance for single and DTP PMSMs. Detailed experimental results show that the simplified EKF exhibits better rotor position and speed estimation accuracy compared to that of FO due to its higher noise-rejection ability.
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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 error is employed to keep the waveform of line back EMF symmetrical by PI controller. This paper also develops a sensorless BLDCM driver to implement the proposed method based on DSP and the experimental results prove the validity of the proposed method.
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Thakur, Anant. "Improvement of Back EMF & Minimization of Torque Ripple of BLDC Motor." SMART MOVES JOURNAL IJOSCIENCE 5, no. 8 (August 6, 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 calculating Back emf of the BLDC by creating a virtual neutral point, a complimentary method is used. This method provides a wide range of speed. A pre conditioning circuit is proposed to rectify the back emf at very low speed. The rotor position can be determined even in stand still condition to minimize the torque ripple and designed to overcome the disadvantages from other torque ripple decrease methods.
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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 between weight function for EMF-PF and fullness degree of liquid in the pipe.
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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 graphical method for detecting the change in titanium structure.
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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 (July 2019): 358–76. http://dx.doi.org/10.1590/2179-10742019v18i31511.

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Dissertations / Theses on the topic "EMF method"

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Abdul, Malek Norun F. "3-D antenna array analysis using the induced EMF method." Thesis, Loughborough University, 2013. https://dspace.lboro.ac.uk/2134/13385.

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The effect of mutual coupling between elements plays a crucial role to the performance of the antenna arrays. The radiation patterns of antenna arrays will be altered by the coupling effect from the adjacent elements thus reducing the accuracy and resolution in direction finding application. This research developed and validated the novel 3-D Algorithm to calculate the far-field pattern of dipole arrays arranged in three dimensions and in any configuration (both in straight and slanted position). The effect of mutual coupling has been accounted using the Induced EMF method. The computation is performed on 2x2 parallel dipoles and 12 dipoles arranged at the edge of a cube. The results are validated with other electromagnetic techniques such as Method of Moment (MoM) and Finite Difference Time-Domain (FDTD). Then, a 2x2 dipole array is chosen for beam steering and experiment validation due to its ease of implementation and feeding network. The array optimisation to control the pattern is performed using a genetic algorithm. The far-field pattern computed using the 3-D algorithm might be less accurate than other 3-D electromagnetic techniques but its array optimisation is faster and efficient. The simulation and measurement results are in good agreement with each other confirmed the validity of the 3-D algorithm.
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Shao, Jianwen. "Direct Back EMF Detection Method for Sensorless Brushless DC (BLDC) Motor Drives." Thesis, Virginia Tech, 2003. http://hdl.handle.net/10919/35065.

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Brushlesss dc (BLDC) motors and their drives are penetrating the market of home appliances, HVAC industry, and automotive applications in recent years because of their high efficiency, silent operation, compact form, reliability, and low maintenance. Traditionally, BLDC motors are commutated in six-step pattern with commutation controlled by position sensors. To reduce cost and complexity of the drive system, sensorless drive is preferred. The existing sensorless control scheme with the conventional back EMF sensing based on motor neutral voltage for BLDC has certain drawbacks, which limit its applications. In this thesis, a novel back EMF sensing scheme, direct back EMF detection, for sensorless BLDC drives is presented. For this scheme, the motor neutral voltage is not needed to measure the back EMFs. The true back EMF of the floating motor winding can be detected during off time of PWM because the terminal voltage of the motor is directly proportional to the phase back EMF during this interval. Also, the back EMF voltage is referenced to ground without any common mode noise. Therefore, this back EMF sensing method is immune to switching noise and common mode voltage. As a result, there are no attenuation and filtering necessary for the back EMFs sensing. This unique back EMF sensing method has superior performance to existing methods which rely on neutral voltage information, providing much wider motor speed range at low cost. Based on the fundamental concept of the direct Back EMF detection, improved circuitry for low speed /low voltage and high voltage applications are also proposed in the thesis, which will further expand the applications of the sensorless BLDC motor drives. Starting the motor is critical and sometime difficult for a BLDC sensorless system. A practical start-up tuning procedure for the sensorless system with the help of a dc tachometer is described in the thesis. This procedure has the maximum acceleration performance during the start-up and can be used for all different type applications. An advanced mixed-signal microcontroller is developed so that the EMF sensing scheme is embedded in this low cost 8-bit microcontroller. This device is truly SOC (system-on-chip) product, with high-throughput Micro core, precision-analog circuit, in-system programmable memory and motor control peripherals integrated on a single die. A microcontroller-based sensorless BLDC drive system has been developed as well, which is suitable for various applications, including hard disk drive, fans, pumps, blowers, and home appliances, etc.
Master of Science
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Anguiano, Sanjurjo David. "Investigation of Hybrid Simulation Methods for Evaluation of EMF Exposure in Close Proximity of 5G Millimeter-Wave Base Stations." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-284324.

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With the emergence of Fifth Generation (5G) mobile networks, the employment ofhigher frequencies in the millimeter-wave (mmWave) range and the realization of agreat number of beams in 5G radio base stations (RBS) make the electromagnetic (EM)simulation of RBS products very costly in terms of hardware and time requirements.In order to compute the electromagnetic field (EMF) exposure in close proximity of theRBS, more efficient simulation methods are required.The move to mmWave frequencies enables the use of the so-called high frequencymethods for EM simulation with RBS antennas. In this thesis, conventional fullwavesimulation solvers and different implementations of hybridization of highfrequency methods with conventional methods are used with different commercial EMsimulation tools, and their performance is evaluated for the purpose of EMF exposureassessment in close proximity of 5G mmWave RBS.Among all the investigated methods, the hybrid scheme with Finite IntegrationTechnique (FIT) and Shooting and Bouncing Rays (SBR) methods, e.g., thatimplemented in CST Studio Suite 2020, outperforms in terms of hardwarerequirements and time costs, although the accuracy is compromised on the side andbehind the mmWave RBS. The Multilevel Fast Multipole Method (MLFMM), e.g.,that implemented in Altair FEKO 2019, though not a hybrid method, also has goodperformance but requires very large Random Access Memory (RAM), and it cannothandle very exquisite details of RBS. The Finite Difference Time Domain (FDTD)method implemented in EMPIRE XPU can also handle the investigated problemseffciently, but for extremely large problems, its requirements on RAM may become thebottleneck. In the thesis, many other hybrid implementations are also investigated,but it is found that they are not suitable for the EMF exposure assessment in closeproximity of the mmWave RBS with evaluation on a planar area of 0.42 m × 1 m at 28 GHz due to various reasons.
För den femte generationens (5G) mobilnät kommer användningen av millimetervågoroch det stora antalet lober som en radiobasstation (RBS) kan hantera att betydaett kraftigt ökat behov av hårdvara och större tidsåtgång för att göra beräkningarav exponeringen för elektromagnetiska fält nära utrustningen. Därför behövs mereffektiva simuleringsmetoder.Eftersom systemen opererar på millimetervåg-frekvenser kan högfrekvensmetoderanvändas i simuleringen av simuleringen av en RBS. I den här avhandlingenutvärderas konventionella metoder, samt olika hybridmetoder för beräkningenav EMF-exponeringen av millimetervågor i närheten av en RBS. De utvärderadehybridmetoderna är implementerade i olika mjukvaror och blandar användandet avhögfrekvensmetoder och konventionella metoder.Av alla utvärderade metoder fungerar hybridmetoden implementerad med finitaintegralmetoden (FIT) och ”Shooting and Bouncing Rays”-metoden (SBR) i CST bästi termer av vilken hårdvara som behövs för beräkningarna och för tidsåtgången.Dock är noggrannheten i beräkningarna på sidan av och bakom RBSen mindrebra. Multilevel Fast Multipole Method (MLFMM)”-lösaren i Feko i FEKO använderingen hybridmetod men presterar bra, men den kräver mycket RAM-minne och kaninte ta hänsyn till små detaljer i RBSen. Finita differensmetoden i tidsdomänen(FDTD) i EMPIRE kan också användas men dess RAM-krav blir en flaskhals förstora simuleringar. Ytterligare hybridmetoder är undersökta i avhandlingen men medslutsatsen att de inte är användbara (av olika anledningar) för beräkningen av EMFexponeringenfrån en RBS opererandes på frekvensen 28 GHz och över en yta som är0.42 x 1 m.
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Gambetta, Daniele Morco. "Sensorless technique for BLDC motors." University of Southern Queensland, Faculty of Engineering and Surveying, 2006. http://eprints.usq.edu.au/archive/00001427/.

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Commutation is a fundamental feature of all DC machines. In conventional DC machines the commutation function is performed by the commutator and brushes. These act as both position sensors and switches. The mechanical commutator has obvious disadvantages. Overcoming those disadvantages has been a major reason behind the development of brushless DC (BLDC) machines. In brushless DC machines commutation is performed by power electronic devices forming part of an inverter bridge. However, switching of the power electronic devices has to be synchronised with rotor position. Position sensing is therefore an essential requirement. This can be done by using sensors such as Hall Effect devices or a sensorless approach may be adopted. Advantages of sensorless techniques include reduced cost and wiring. The most common sensorless method is based on detection of the zero crossing of back EMF signals. But this technique works only above a certain speed since back EMF is directly proportional to speed. As a result BLDC systems which rely solely on back EMF signals for commutation suffer from relatively poor starting performance characterised by back rotation of up to one hundred and eigthty electrical degrees and large fluctuations in electromagnetic torque resulting from non-ideal commutation instants. This may not be acceptable for some applications and many researchers have attempted to overcome those problems. The aim of this project has been to investigate the possibility of a sensorless technique which does not cost more than the back EMF method but with a performance at start-up comparable with that obtained when Hall sensors are used. Initial investigations led to a saliency based method. Detailed theoretical analysis is presented which shows that the method is insensitive to variations in operational parameters such as load current and circuit parameters such as power device voltage drops and winding resistances. There is a close parallel between it and the back EMF method and this makes it easy to swap to the latter method at high speed if necessary. A starting strategy, relying on saliency related measurements, is proposed which offers starting performance much better than the back EMF method and almost as good as Hall sensor based techniques. Experimental evidence is provided to confirm that commutation instants determined by the proposed method are practically coincident with those obtained when Hall sensors are used.
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Paula, Geyverson Teixeira de. "Cálculo da força contra eletromotriz em máquinas síncronas com ímãs na superfície do rotor." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/18/18153/tde-14062016-113636/.

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O presente trabalho trata do cálculo da força contra eletromotriz em carga de uma máquina síncrona com ímãs na superfície do rotor (cuja forma de onda de força contra eletromotriz é não senoidal) sendo esta alimentada por correntes de fase cujas forma de onda são quadradas. Para conduzir esta investigação e calcular a força contra eletromotriz da máquina em estudo, faz-se uma revisão sobre o Método da Permeabilidade Fixa, método este que permite a linearização do ponto de operação da máquina. Dessa forma, as simulações são conduzidas por meio do método dos elementos finitos e do Método da Permeabilidade Fixa, levando-se em conta a forma de onda da corrente de alimentação. Atenção especial é dada ao modo que se analisa o fluxo concatenado e a forma de obtenção da força contra eletromotriz uma vez que as formas de onda do fluxo concatenado sofrem variações abruptas a cada 60º elétricos. Além destes parâmetros, analisa-se também cada uma das parcelas do torque eletromagnético, i.e., torque mútuo, torque de relutância e torque de borda, sendo realizado ao final do trabalho, uma comparação entre a soma da estimativa de cada parâmetro com o valor do torque eletromagnético obtido por meio de uma simulação não linear.
This work deals with the assessment of a surface mounted magnet synchronous machine\'s parameters (whose back-EMF is approximately trapezoidal) and that is fed by an ideal square current waveform. In order to investigate and describe each machine\'s parameter, a review on Frozen Permeability Method is presented. Some simulation by means of finite element method with the aid of Frozen Permeability Method are carried out taking into account that the machine is fed by an ideal square current waveform. The results for flux-linkage wave-form and back-EMF waveform are shown and analyzed. A special attention is given to back-EMF calculation since the linkage flux of each phase has an abrupt change every sixty electrical degrees due to the phase commutation. In addition, an attention is given to each torque component on load condition, i.e., mutual torque, reluctance torque, cogging torque and a comparison between the electromagnetic torque and the summation of these components.
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Wiid, P. Gideon. "Investigating cost-effective EMC methods." Thesis, Stellenbosch : University of Stellenbosch, 2005. http://hdl.handle.net/10019.1/1520.

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Thesis (MScEng (Electrical and Electronic Engineering))--University of Stellenbosch, 2005.
Due to the expensive nature of high frequency measurements in the EMC (Electromagnetic Compatability) field, more affordable methods of measurement instrumentation and environments are investigated. Different calibration methods for an Automatic Network Analyser (ANA) are evaluated against each other to determine the most cost-effective method of calibration. The mathematics for all the calibration methods are used in MATLAB programs which perform the error-calculation and correction which is usually done by the ANA software. These programs can be used to develop a simplified homebuilt ANA at reduced cost. The MATLAB program calibrations are compared to actual ANA calibrations to determine accuracy. Different measurement environments are considered as well to decide on a best compromise between cost and accuracy. To achieve this a reverberation chamber was built in which measurements were done and compared to measurements done on an Open Area Test Site. The Device Under Test was a standard radiator constructed specifically for such measurements. The development of both the radiator and the reverberation chamber are discussed and all the measurement results are considered in this thesis.
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Klauda, Zbyněk. "Návrh sběrnice LVDS s vysokou odolností EMC." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2008. http://www.nusl.cz/ntk/nusl-217695.

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My thesis deals with project of LVDS busbar with high resistivity with regard to disturbance from surroundings and radiation undesirable electromagnetic waves into its environment. Project of LVDS busbar was elaborated by numeric methods and it was suggested optimal solution of the shape and material of multiply technology DPS. The project was realized on desired driving-point impenance of busbar Z=100 ohm with frequency f1=100 MHz of the first harmonic component rectangular signal of defind modality, entering and diagonal edge.
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Baccherini, Simona. "Pattern recognition methods for EMG prosthetic control." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amslaurea.unibo.it/12033/.

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In this work we focus on pattern recognition methods related to EMG upper-limb prosthetic control. After giving a detailed review of the most widely used classification methods, we propose a new classification approach. It comes as a result of comparison in the Fourier analysis between able-bodied and trans-radial amputee subjects. We thus suggest a different classification method which considers each surface electrodes contribute separately, together with five time domain features, obtaining an average classification accuracy equals to 75% on a sample of trans-radial amputees. We propose an automatic feature selection procedure as a minimization problem in order to improve the method and its robustness.
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Balling, Stefan. "Numerische Berechnung elektromagnetischer Felder - Erweiterung einer Hybridmethode aus Momentenmethode und Einheitlicher Geometrischer Beugungstheorie um die Verallgemeinerte Multipoltechnik." Doctoral thesis, Göttingen Sierke, 2007. http://d-nb.info/987235559/04.

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Karlsson, Lisa, and Elin Stuhr. "Biomekanisk mätmetod och ergonomisk analys av träningsmaskiner." Thesis, Halmstad University, School of Business and Engineering (SET), 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-1620.

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To get the maximal output of your exercise in gym machines, there are different factors

to be considered. For example the strength of the muscle varies dependent on the position

of the muscles. To get the best results of the exercise the load has to reduce and increase

at specific positions.

This study was made in cooperation with Caretaker Scandinavia AB, a company for

sales, marketing and development in health care. They are general agent for Nordic Gym

who works with manufacturing of equipment and machines for gym and fitness.

The aim of this study was to generate a method of measurement to evaluate and control

the biomechanics of Nordic Gym´s workout equipment. A protocol for an ergonomic

analysis on the equipment has also been elaborated.

One of the methods to measure the biomechanics was to measure the torque through the

whole movement. The other method was electromyography (EMG). The EMGequipment

registers electric signals that are generated in a working muscle, and makes it

possible to see when the maximum muscle activity achieves. The results of those

measurements will be compared to the muscles strengthprofile which describes how the

muscle generates power in different positions throughout the movement.

To measure the ergonomics an ergonomic protocol where produced, which was based on

ergonomics aspect, adapted to gym machines.

The method of measurement where tested on Nordic Gym´s training machine 101SE leg

extension and Free Motion´s machine Leg Extension GZF18013 and this machines where

controlled and evaluated. Two test persons tried out the machines and the machines

where analysed in an ergonomic and a biomechanical perspective. The result shows that

the biomechanics of Nordic Gym´s machine where a bit better than the biomechanics of

FreeMotion´s machine. But in the both case the difference between the values of torque is

marginal, to improve the biomechanics insistence a bigger different should be necessary

to use. The ergonomic analyse of the machines showed that the ergonomics where good

and well planed. Both machines had some small ergonomic lacks, which can be

improved.

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Books on the topic "EMF method"

1

Tesche, Frederick M. EMC analysis methods and computational models. New York: John Wiley & Sons, Inc., 1997.

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Papp, Gábor, Tamás G. Weiszburg, Anton Beran, and Eugen Libowitzky, eds. Spectroscopic methods in mineralogy. Germany: Mineralogical Society of Great Britain and Ireland, 2004. http://dx.doi.org/10.1180/emu-notes.6.

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Emg secrets. Philadelphia, Pa: Hanley & Belfus, 2003.

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Ivo, Doležel, and Karban Pavel 1979-, eds. Integral methods in low-frequency electromagnetics. Hoboken, N.J: Wiley, 2009.

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Porter, Warren J. Preplanning for EMS. Sudbury, Mass: Jones and Bartlett Publishers, 2010.

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R, Stapleton Edward, and Edgerly Dennis, eds. EMT prehospitalcare. 4th ed. St. Louis: Mosby, 2010.

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Ricard, Sarff, ed. EMS for secure facilities. Australia: Delmar Cengage Learning, 2012.

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Chapleau, Will. EMT basic exam. 2nd ed. Hauppauge, N.Y: Barron's Educational Series, 2008.

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T, Dickinson Edward, ed. EMR complete: A worktext. Boston: Brady, 2011.

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Limmer, Daniel. EMR complete: A worktext. Edited by Dickinson Edward T. Boston: Brady, 2011.

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Book chapters on the topic "EMF method"

1

Bai, Kun, and Kok-Meng Lee. "A Back-EMF Method for Multi-DOF Motion Detection." In Permanent Magnet Spherical Motors, 109–22. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-7962-7_6.

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Tikhonova, Z., D. Kraynev, and E. Frolov. "Thermo-Emf as Method for Testing Properties of Replaceable Contact Pairs." In Lecture Notes in Mechanical Engineering, 1097–105. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-22063-1_117.

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Lei, Pan, Wang Beibei, and Gong Wei. "A Novel Method for BLDCM Control Based on Phase Back-EMF Observation." In Informatics in Control, Automation and Robotics, 93–101. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-25899-2_13.

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Moroz, Mykola, Fiseha Tesfaye, Pavlo Demchenko, Myroslava Prokhorenko, Daniel Lindberg, Oleksandr Reshetnyak, and Leena Hupa. "Thermodynamic Properties of Magnetic Semiconductors Ag2FeSn3S8 and Ag2FeSnS4 Determined by the EMF Method." In The Minerals, Metals & Materials Series, 87–98. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-72131-6_8.

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Nesterenko, Mikhail V., Victor A. Katrich, Yuriy M. Penkin, Victor M. Dakhov, and Sergey L. Berdnik. "Generalized Method of Induced EMF for Investigation of the Characteristics of Impedance Vibrators." In Lecture Notes in Electrical Engineering, 113–54. New York, NY: Springer New York, 2010. http://dx.doi.org/10.1007/978-1-4419-7850-9_5.

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Katayama, Iwao, Toshihiro Tanaka, Shin-ichi Akai, Kisao Yamazaki, and Takamichi Iida. "Activity Measurement of Liquid Sn-Ag-Bi Alloys by Fused Salt EMF Method." In Materials Science Forum, 129–38. Stafa: Trans Tech Publications Ltd., 2005. http://dx.doi.org/10.4028/0-87849-980-6.129.

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Katayama, Iwao, Yusuke Sendai, Dragana Zivkovic, Dragan Manasijević, Zivan Zivkovic, and Hiromi Yamashita. "Experimental Determination fo Ga Activity in Liquid Ga-Sb-Tl Alloys by EMF Method." In Solid State Phenomena, 71–76. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/3-908451-33-7.71.

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Hamuyuni, Joseph, Dmitry Sukhomlinov, Mari Lundström, and Pekka Taskinen. "Thermodynamic Stability of Condensed Phases in the Ternary System CaO–Cu–O by the EMF Method." In The Minerals, Metals & Materials Series, 79–86. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-52192-3_8.

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Moroz, Mykola, Fiseha Tesfaye, Pavlo Demchenko, Myroslava Prokhorenko, Bohdan Rudyk, Lyudmyla Soliak, Daniel Lindberg, Oleksandr Reshetnyak, and Leena Hupa. "Thermodynamic Examination of Quaternary Compounds in the Ag–Fe–(Ge, Sn)–Se Systems by the Solid-State EMF Method." In The Minerals, Metals & Materials Series, 271–83. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-65253-1_24.

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Archambeault, Bruce, Colin Brench, and Omar M. Ramahi. "Method of Moments." In EMI/EMC Computational Modeling Handbook, 71–86. Boston, MA: Springer US, 2001. http://dx.doi.org/10.1007/978-1-4615-1557-9_4.

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Conference papers on the topic "EMF method"

1

Willmann, Benjamin, Hanno Rabe, Christoph Leugers, Oussama Sassi, Christian Waldera, and Ralf Vick. "Current-based EMF-assessment method for vehicles." In 2019 International Symposium on Electromagnetic Compatibility - EMC EUROPE. IEEE, 2019. http://dx.doi.org/10.1109/emceurope.2019.8871776.

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Pan, Haili, Bangjian An, Yu-bao Chen, and Elsayed Orady. "Thermal EMF method for monitoring drilling tool wear." In Measurement Technology and Intelligent Instruments, edited by Li Zhu. SPIE, 1993. http://dx.doi.org/10.1117/12.156418.

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Sandrolini, Leonardo, Ugo Reggiani, and Marco Landini. "Prediction of near field EMI interference in power converters via the induced EMF method." In 2014 International Symposium on Electromagnetic Compatibility - EMC EUROPE. IEEE, 2014. http://dx.doi.org/10.1109/emceurope.2014.6930912.

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Mizouri, Zied, Khalil El Khamlichi Drissi, Lenaic Monconduit, Christophe Pasquier, Benoit Sion, and Francois Gabrielli. "Efficiency of Matrix Pencil Method in Stimulus Artifact Removal." In 2018 EMF-Med 1st World Conference on Biomedical Applications of Electromagnetic Fields (EMF-Med). IEEE, 2018. http://dx.doi.org/10.23919/emf-med.2018.8526065.

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Liu, Yuxin, Wenfa Qi, and Zongming Guo. "An Information Hiding Method Based on EMF Files Carrier." In 2015 International Conference on Intelligent Information Hiding and Multimedia Signal Processing (IIH-MSP). IEEE, 2015. http://dx.doi.org/10.1109/iih-msp.2015.77.

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Mostak, Ivan, Domagoj Prebeg, and Mario Cifrek. "Modelling of therapeutic cold plasma generator using finite element method." In 2018 EMF-Med 1st World Conference on Biomedical Applications of Electromagnetic Fields (EMF-Med). IEEE, 2018. http://dx.doi.org/10.23919/emf-med.2018.8526045.

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Hong, Jinseok, Sungyoon Jung, and Kwanghee Nam. "An incorporation method of sensorless algorithms: Signal injection and back EMF based methods." In 2010 International Power Electronics Conference (IPEC - Sapporo). IEEE, 2010. http://dx.doi.org/10.1109/ipec.2010.5543188.

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Ajay, Pranav Venugopal, Chaithanya S, Lekshmi R. Chandran, and V. Dheeraj Krishna. "Sensor less Speed Control Method for Brushless DC Motors Using Back EMF Method." In 2018 3rd IEEE International Conference on Recent Trends in Electronics, Information & Communication Technology (RTEICT). IEEE, 2018. http://dx.doi.org/10.1109/rteict42901.2018.9012317.

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Junfei Huang and Yunzhan Gong. "An EMF activity tree based BPEL defect pattern testing method." In 2010 2nd International Conference on Computer Engineering and Technology. IEEE, 2010. http://dx.doi.org/10.1109/iccet.2010.5485536.

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Subramani, Saikiran, Suhashine Sukumar, Zuber Ahmed, Vishaal Venkat, V. Sriram, and B. Geethanjali. "Analysing the Performance of Blood Pressure Parameters Using EMF Method." In 2020 4th International Conference on Trends in Electronics and Informatics (ICOEI). IEEE, 2020. http://dx.doi.org/10.1109/icoei48184.2020.9142931.

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Reports on the topic "EMF method"

1

Best, M. E. Electromagnetic (EM) methods. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2012. http://dx.doi.org/10.4095/291770.

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Knight, Kathleen S., Robert P. Karrfalt, and Mary E. Mason. Methods for collecting ash (Fraxinus spp.) seeds. Newtown Square, PA: U.S. Department of Agriculture, Forest Service, Northern Research Station, 2010. http://dx.doi.org/10.2737/nrs-gtr-55.

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Tanner, David J. Energy Calibration of the BaBar EMC Using the Pi0 Invariant Mass Method. Office of Scientific and Technical Information (OSTI), April 2007. http://dx.doi.org/10.2172/901853.

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Barrios, Amalia E., and Richard Sprague. EM Propagation (METOC Impacts). Fort Belvoir, VA: Defense Technical Information Center, September 2006. http://dx.doi.org/10.21236/ada612398.

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Barrios, Amalia E., and Richard Sprague. EM Propagation (METOC Impacts). Fort Belvoir, VA: Defense Technical Information Center, September 2007. http://dx.doi.org/10.21236/ada541740.

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Pointon, T. D. A method for handling slanted conducting surfaces in EM PIC codes. Office of Scientific and Technical Information (OSTI), June 1988. http://dx.doi.org/10.2172/6998279.

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Newman, E. H., and M. Kragalott. Moment Method Analysis of the Electric Shielding Factor of a Conducting TM Shield at ELF. Fort Belvoir, VA: Defense Technical Information Center, April 1995. http://dx.doi.org/10.21236/ada309645.

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Constable, Steven. Gas Hydrate Characterization in the GoM using Marine EM Methods. Office of Scientific and Technical Information (OSTI), March 2012. http://dx.doi.org/10.2172/1049493.

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Kurnik, Charles W., and Jeff Romberger. Chapter 19: HVAC Controls (DDC/EMS/BAS) Evaluation Protocol. The Uniform Methods Project: Methods for Determining Energy Efficiency Savings for Specific Measures. Office of Scientific and Technical Information (OSTI), October 2017. http://dx.doi.org/10.2172/1399361.

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Wilt, M. Reservoir characterization and process monitoring with EM methods. 1994 Annual report. Office of Scientific and Technical Information (OSTI), May 1995. http://dx.doi.org/10.2172/71302.

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