In this research, the INDUCTION of high-frequency alternating stresses in steel parts using an alternating MAGNETIC field has been investigated experimentally. This treatment, in addition to the INDUCTION of alternating stresses, can increase the temperature of the part and facilitate the release of residual stresses. Residual stresses caused by the welding process in the area around the weld line are a good example of the applications of this method. This method is very fast, and it can be used for small or large parts without space limitations. Also, the necessary equipment can be prepared easily at low costs.In this study, a small coil with an iron core was used to induce the MAGNETIC field, and a simple and cheap electric board was used to create an oscillating current in the coil. The electric board employs a high-frequency electronic switch in a DC circuit to generate a rectangular waveform voltage. The obtained experimental results show that the steel part can resonate at frequencies close to the first longitudinal natural frequency or its subharmonics, and in this case, normal stresses in the order of 100 MPa are induced in the part. By upgrading the electrical equipment prepared in this research, it is possible to increase the induced stresses several times. Hence, employing appropriate equipment, the high-frequency MAGNETIC INDUCTION method can be used as an alternative method for stress relief of welded joints.

In this paper are present the results of measurements of MAGNETIC INDUCTION at some locations in city Bor (the east Serbia) dating from the household electric devices and transformer stations suited near the residental areas. Stress is on the extremely low frequent electroMAGNETIC radiation from transformer stations and other high voltage instalations in urban areas. Risk of the extremely low frequent electroMAGNETIC radiation of frequency 50 Hz on human health, by measuring the MAGNETIC INDUCTION, is considered. The measured data are compared with the corresponding ones in literature, as well as with the critical values suggested by the Serbian Ministery of Environment, Mining and Spatial Planning. It is shown that some of them produce a very strong electroMAGNETIC field, so that people should stay far from them. The necessity to relocate the transformer stations to the safe distance from residental areas, as well as the regular control of the positions of the household electrical equipments in the residental places, are strongly recommended.

In this investigation we induce mechanical force to a liquid, by MAGNETIC field. The method that we used is similar to linear INDUCTION motor (LIM). The main goal of the present investigation is inducing mechanical force for each element of liquid by induced electrical current to each element of liquid and interaction between induced electric current and external MAGNETIC field. For achieving our purpose we used several chemical liquid (including some acids, bases, agricultural pesticides and chemical fertilizer) against of rotating MAGNETIC field. Result of experimental show that inducing mechanical force to each element of liquid is impossible and the magnitude of INDUCTION force related to electrical conductivity and MAGNETIC permeability of liquid. That induced force can be used as a MAGNETIC pump, which pumped liquids with no moving parts. This is very useful for solving the problem of corrosion, because there isn't any direct contacting with liquid and pump.

Background and Aims: Disc displacement is the most common temporomandibular joint disorder and MAGNETIC resonance imaging (MRI) is the gold standard in its diagnosis. This disorder can lead to changes in signal intensity of MAGNETIC resonance (MR). The purpose of this study was evaluation of correlation between relative signal intensity of MR images of retrodiscal tissue, superior and inferior head of lateral ptrygoid muscle with type of anterior disk displacement and condylar head flattening in patients with temporomandibular disorder (TMD).Materials and Methods: In this retrospective study, 31 MR images of patients who had anterior disc displacement were evaluated. After relative signal intensity measurement for retrodiscal tissue, superior and inferior head of lateral ptrygoid muscle, the correlation between relative signal intensity and type of anterior disc displacement was evaluated with repeated measure ANOVA test. In each of these 3 areas, t-test was used to compare the groups with and without condylar head flattening.Results: The correlation between relative signal intensity of MR images and type of anterior disc displacement in retrodiscal tissue, superior and inferior head of lateral ptrygoid muscle was not significant. There was also no statistically significant correlation between relative signal intensity of MR images and flattening of condylar head in retrodiscal tissue, superior and inferior head of lateral ptrygoid muscle (P>0.05).Conclusion: According to findings of this study, relative signal intensity of MR images in retrodiscal tissue, superior and inferior head of ptrygoid muscle is not a good predictor for type of anterior disc displacement and flattening of condylar head. It seems that this cannot be used as a diagnostic marker for TMD progression.

MAGNETIC INDUCTION tomography (MIT) is one of the new imaging techniques, and due to its characteristic such as non-intrusive and non-destructive, it has potential for use in many industries, including biological industries, multiphase flows, medical imaging, agriculture and food industries. Main parts of the MIT system are transmitter and receiver sensors, data acquisition system and image reconstruction algorithm. In this research, performance comparison of four image reconstruction algorithms in applied current MAGNETIC INDUCTION tomography (AC-MIT) system was investigated. This system has two innovative annular electrodes as transmitter sensors and 648 coils as a receiver sensor. In order to evaluate the system performance, 12 combinations of target objects were used and image reconstruction was performed using linear back projection algorithm, Landweber iterative algorithm, Tikhonov regularization method and iterative Gauss-Newton algorithm. Size error (SE) and Relative image error (IE) parameters were used to evaluate the quality of the reconstructed images. The results showed that in all combinations of target objects, the IE values of iterative Gauss-Newton algorithm are lower than other algorithms. The results of size error parameter showed that in all four image reconstruction algorithms; increasing number of target objects increases SE parameter. As a general conclusion, it can be stated that iterative Gauss-Newton algorithm has a better performance compared to other algorithms.

Single-phase squirrel cage and three-phase INDUCTION electromotors are the most popular electromotors used in industry from long ago. When an INDUCTION motor starts with direct connection method, it takes a lot of current from the power supply (several times the nominal current), so, several methods have been devised to start such electromotors. These methods either reduce the voltage of the stator or increase the value of rotor resistance. In this paper a new method is presented that reduces the value of the MAGNETIC flux in stator core resulting in reduction of INDUCTION voltage in the rotor bars culminating in reduction of rotor and stator currents. This system reduces the electromotor loss and smartly protects itself against damages due to overload. Process functions are analyzed, the uses of the system are discussed and the operation of the electromotor is simulated in Matlab version 7.11.0.584 (R2010b) and Maxwell 16.0.

Although conventional high-speed gas turbines and electric motors equipped with mechanical gearboxes are practical solutions, they face significant environmental constraints and suffer from the inefficiencies associated with mechanical converters. As a result, high-speed electric motors, especially those designed to overcome these limitations, have become increasingly favorable. Bearing-less INDUCTION motors (BLIMs) offer notable advantages, including the elimination of friction losses, minimization of wear, reduced maintenance requirements, and the inclusion of an internal monitoring system. However, due to their unique structure and the complex interaction between torque and force winding fields, BLIMs are not well-suited for high-power applications. This research investigates the analytical design of a high-speed BLIM, aiming to enhance performance, efficiency, and torque density. To achieve this, a multi-objective optimization process of the derived dimensions is employed. Furthermore, a finite element analysis of the motor is conducted, and the results are compared with those of a BLIM optimized using a genetic algorithm.

In this paper a modified MAGNETIC equivalent circuit approach is presented for the steady state and transient analysis of squirrel cage INDUCTION motor. The effects of all spatial harmonics, stator and rotor tooth reluctances, saturation effects, rotor skewing, air gap permeances and leakage permeance of slots, and type of winging connection are taken into account. Since there is no restriction on stator winding, rotor bar and air gap length symmetry this approach is able to model the INDUCTION motor under both healthy and faulty conditions. In the proposed model, by considering the actual dimensions of stator and rotor laminations, some simplifications have been considered. Hence, the number of variables in the system of algebraic of the system of algebraic equations improves and this leads to better convergence of numerical solution.

There is always a difference between the numerical, theoretical and experimental values of a physical quantity which is due to measurement errors. ElectroMAGNETIC hyperthermia using micro/nano particles is not an exceptional case. This deviation could affect the temperature distribution of domain. In this paper, the deviation of any effective parameter on temperature distribution, including concentration, injection area and radius of micro/nano particles, power and frequency of electroMAGNETIC field are studied and uncertainty analysis is performed. The study was based on the INDUCTION heating by micro/nano particles in an electroMAGNETIC field hyperthermia. The finite difference method was used to solve the equations numerically. Results show that the measurement of parameters such as electroMAGNETIC field power, radius of micro/nano injection region should be done accurately.