The propagation of torsional WAVES in a prestressed fiber-reinforced half-space under the effect of MAGNETIC field and gravity has been discussed. The problem has been solved analytically using Whittaker function to obtain the exact solution frequency equations. Numerical results for stress, gravity and MAGNETIC field are given and illustrated graphically. Comparisons are made with the results predicted by the boundary value condition for rigid boundary and for traction free boundary in the presence and in the absence of the effect of a MAGNETIC field, gravity and stress. It is found that the reinforcement, gravity and MAGNETIC field have great effects on the distribution.

Although, the hot solar corona was discovered more than sixty years ago, however, the exact dissipation mechanism that heats the corona is still unknown. Resonant absorption and damping of Alfven WAVES appear to be one of the major candidates in this respect. The corona is highly structured and inhomogeneous medium, containing a large number of discrete MAGNETIC loops. In this paper a cylindrical MAGNETIC flux tube with a specified density profile is considered, and the ideal equation of motion in coronal condition is obtained. The problem is reduced to solving a wave equation for the component of MAGNETIC perturbation along the tube axis. The mathematical formalism is identical with that of the propagation of electroMAGNETIC WAVES in optical fibers with a varying index of refraction through the cross section of the fiber. The ideal equations of MAGNETIC and velocity fields in the global modes are singular and are solved numerically, using a modified shooting scheme. Resistive and viscous dissipation rates as an exponential time decay of disturbances are obtained. The results show that the amount of energy produced in the resonant layer inside the tube seems to be responsible for heating the corona.

The effect of MAGNETIC field on torsional WAVES propagating in non-homogeneous viscoelastic cylindrically aeolotropic material is discussed. The elastic constants and non-homogeneity in viscoelastic medium in terms of density and elastic constant is taken. The frequency equations have been derived in the form of a determinant involving Bessel functions. Dispersion equation in each case has been derived and the graphs have been plotted showing the effect of variation of elastic constants and the presence of MAGNETIC field. The obtained dispersion equations are in agreement with the classical result. The numerical calculations have been presented graphically by using MATLAB.

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.

Spiral wave is a particular spatiotemporal pattern, observed in a wide range of complex systems such as neuronal network. Appearance of these WAVES is related to the network structure as well as the dynamics of its blocks. In this paper, we propose a new modified Hindmarsh-Rose neuron model. The proposed model uses a hyperbolic memductance function as the monotonically differentiable MAGNETIC flux. An external electroMAGNETIC excitation is also considered in the model. Firstly, we study the dynamics of the proposed neuron model through bifurcation diagram and Lyapunov spectrum, in two cases of no excitation and periodic excitation. The bifurcation diagram shows the property of antimonotonicity, which has not been observed in the previous models. Then a square network is constructed and we investigate the spatiotemporal pattrens. By varying the parameters values, spiral WAVES are observed in specific ranges. The formation of these WAVES depends on the interaction of all parameters simultaneously.

MAGNETIC induction caused by sea characteristics has recently been the focus of attention of several studies. Since water is an electrically conductive liquid, its movement in the Earth's MAGNETIC field produces a transverse MAGNETIC force at each unit of charge. Therefore, it seems essential to identify the factors affecting the fluctuations of these MAGNETIC fields and the effect of these factors on the marine, navy, and military applications. In this research, the changes of MAGNETIC fields caused by sea WAVES in the Strait of Hormuz have been investigated. For this purpose, we use the WAVES parameters obtained from numerical model of MIKE21, and then, calculate the MAGNETIC field and observe the MAGNETIC field fluctuations in the study region. The results show that the values of MAGNETIC field vary between 0 and 0. 2 nanotesla. Moreover, MAGNETIC field values in Bandar Abbas coast and Iran shoreline within the study region are less than the MAGNETIC field values in the Islands of Qeshm, Hormuz and Larak. In general, it can be said that the MAGNETIC field fluctuations are completely caused by changes in the WAVES parameters so that the trend and pattern of changes of three variables of the WAVES including height, period, and MAGNETIC field within the study region are almost the same. Therefore, due to the low height and low period of the WAVES in the Strait of Hormuz, the MAGNETIC field caused by the WAVES is not considerable, and thus, its effect on MAGNETIC field fluctuations is not also noticeable. As a result, in some maritime applications, like determination of the range of MAGNETIC field fluctuations for the purpose of setting sensors of a torpedo and preventing the torpedo deviation from the goal, the effect of WAVES on the MAGNETIC field fluctuations can be ignored.

Background: The widespread use of cell phones has led to an increase in concern about the effect of radiofrequency radiation on the physiology of the human body. This study was conducted to determine the different reaction temperatures of different brain tissue in exposure to mobile radiofrequency WAVES. Method: This was an experimental study. The cowchr('39')s brain tissue was examined in a chamber at three depths of 2, 12 and 22 mm and at a distance of 4 mm and 4 in the cell phone from the tissue for 15 min of the radiofrequency radiation of the mobile phone during exposure and after the exposure was discontinued. . Luteron thermometer was used to measure tissue temperature. Results: During the exposure to the brain tissue at a distance of 4 mm from the mobile phone, the temperature increase at 22 mm depth was more than the depths of 2 and 12 mm, so that the tissue temperature at 2, 12 and 22 mm depths was 29 ° C 0 /, 0. 3 / 0 and 0/37 respectively. Also, the temperature of the brain tissue at 4 cm intervals was greater than the other depths with increasing tissue depth. An increase in tissue temperature was also associated with increased brain tissue depth after exposure to mobile phones. The temperature of the depth of 22 mm of texture increased during exposure to higher temperatures. Conclusion: Mobile radiofrequency WAVES not only increased the temperature of the tissue at all depths of the brain but at higher depths (22 mm), brain tissue was higher than the temperature of mobile radiofrequency WAVES.

Seed priming is a very simple method that ends in better germination and establishment of seedling. One of the priming methods, is biophysical methods. Treating seeds by ultrasound WAVES and MAGNETIC field are among the biophysical methods. With proven the medicinal effects of ajowan (Curum copticum), production and processing of the plant species in the world has a special importance. In order to study the effects of ultrasound WAVES and MAGNETIC field on growth and yield of ajowan in the field conditions, increasing the percentage and speed of seed germination, increasing resistance of seedlings, and increasing resistance to environmental stresses such as drought, cold, heat, and increasing resistance to diseases and pests, the research was carried out at the University of Agriculture and Natural Resources of Ramin during 1388-89. Seeds were two times treated with Ultrasound 22 KHz frequency, 2 and 5 min (U2, U3) and treatment related to the 5000 gauss MAGNETIC field intensity in three different times, 15, 30, 45 (M2, M3& M4) at a temperature of 30oc was applied. Control treatment was also considered. Factorial experiment in Randomized complete blocks design with four replications was carried out. The results showed that, with treatments applied MAGNETIC field and ultrasonic wave, vigure and germination of ajowan seeds improved. It seems that the MAGNETIC field treatment at the time of 30 minutes, and in some cases 45 minutes with ultrasound WAVES treatment of 5 minutes had the greatest impact on the plants. Despite the high sensitivity of both plant diseases and pests, no trace of disease and pest found in field.

In this paper, the standing magnetohydrodynamic slow WAVES in the MAGNETIC flux tubes are investigated under coronal conditions. The temperature and equilibrium plasma density of the tube is assumed to be homogeneous and constant and the compressive viscosity is considered as the damping mechanism. Also, the plasma flow is considered in the flux tube. Assuming that the damping rate to be much smaller than the oscillation frequency of the WAVES, the perturbation method is used to solve the problem. The oscillation frequency and the eigenfunctions are found from the first-order perturbation while the damping rate is determined from the second-order perturbation. To increase the flow speed makes the oscillation frequency decreases and the damping rate increases. Also, increasing each of the flow speed and background temperature of the tube, decreases the ratio of the damping time to the oscillation period. But this ratio increases due to the increasing the length of the tube. The results found here are consistent with the theoretical results obtained earlier. Also, the obtained results can justify some observational cases.

What are electroMAGNETIC WAVES? How are they created and how can they move? How can we widely understand and organize them? What are the different properties of their relationship with electrical and MAGNETIC effects? In this paper, we intend to investigate the effects of electroMAGNETIC WAVES on humans and living organisms by answering these questions. In the beginning, the types of electroMAGNETIC WAVES are classified in terms of frequency range and are investigated in terms of ionization and non-ionization. It then refers to the general principles of protection against radiation. The result of the present study is that if the prescribed standards are met, the radio and microwave radio in the public environment do not pose a threat to humans.