Alternating electromagnetic field

MWs are a form of non-ionizing radiation with a typically standard frequency of 2.45 GHz, a wavelength of 12.2 cm and photon energy of 10 5 electron volts. When dipolar molecules such as water or the polar side chains of proteins are exposed to the rapidly alternating electromagnetic fields, they oscillate through 180° at the rate of 2.45 billion cycles... 

Size effects in optics of M nanocrystals are caused by influence of a crystal surface on movement of conductivity electrons in alternating electromagnetic field. Under action of a field with frequency co oscillations of conductivity electrons, which unlike valent electrons are not bonded to cations of M crystal, are determined by the Eq. (3) [14]... 

At resonance, energy absorption from the alternating electromagnetic field would come quickly to an end due to equalization of N and A i if the upper spins did not have an independent means of falling back. This comes about by the same... 

Each of them expresses the same fact, that is, that magnetic charges do not exist. Equations 1.109 have been derived by algebraic manipulation of Biot Savart law for direct currents, but they actually remain valid for alternating electromagnetic fields, and are in effect the fourth of Maxwell s equations. 

An alternating electromagnetic field in which the current flow is tangential to interfaces between media of different conductivity so that the normal component of the electric field is zero and that charges do not arise. This happens for example when an induction probe is located on the axis of a borehole and the medium possesses cylindrical symmetry in this case, the electric field has a pure inductive character. 

Loss angle (S) - For a dielectric material in an alternating electromagnetic field, 5 is the phase difference between the current and the potential difference. The function tan 5 is a measure of the ratio of the power dissipated in the dielectric to the power stored. 

The experiment is composed of four steps, namely gas pumping, lower pressure gas adsorption, high pressure gas adsorption and gas emission measurement. Experiments are conducted when alternative electromagnetic field is exerted on coal containing gas in the last three steps to study gas adsorptive constant alb. The gas used is methane, and coal samples are anthracite and bituminous coal. 

The alternative electromagnetic field is exerted on coal particles in the last three steps with fixed parameters which are voltage of 500 to 1200 V, and frequency of 0.54 to 1.58 MHz. When alternative electromagnetic field is exerted in the second step or the third step, it is exerted all the time. When it is applied in adsorptive experiment, the operation are as following First, the coal samples is pumped to vacuum, then let one atmosphere methane absorb into coal samples until it reach to adsorptive balance, meanwhile record adsorptive amount changing with time. When the measurement of high... 

When alternative electromagnetic field is exerted in adsorptive step, typical experimental result is shown in Figure 2, Figure 3, Figure 4 and Figure 5 in which y axis represent gas adsorptive quantity calculated indirectly from every ton of coal adsorptive quantity and x axis represent adsorptive balance pressure. Figure 2 and Figure 3 show the adsorptive results which the volt of alternative... 

The electromagnetic induction is based on Lenz s law and the principles found by Michael Faraday [2]. The heating phenomena of ferromagnetic and conductive materials, which appear when such materials are exposed to an alternating electromagnetic field, are based on eddy currents and magnetic polarization effects (hysteresis). 

For microwave welding, it is also possible to preferentially heat the interface by placing a susceptor at the joint interface, where the susceptor may include conductive polymer, carbon particles, ferromagnetic ceramic particles or other materials that heat in an alternating electromagnetic field. 

A. Matsumine, K. Kusuzaki, T. Matsubara, K. Shintani, H. Satonaka, T. Wakabayashi, S. Miyazaki, K. Morita, K. Takegami, A. Uchida, Novel hyperthermia for metastatic bone tumors with magnetic materials by generating an alternating electromagnetic field. Clin. Exp. Metastasis 24 191-200, 2007. 

The purpose of the constant magnetic field is to split the single level in two due to the nuclear Zeeman effect. The alternative electromagnetic field 5(co) facilitates transitions between sublevels. The third coil is to measure absorption. The principle difference between NMR and FRS is as follows on account of its enormous resolution, y resonance allows one to define the superfine structure investigating the transition between different nuclei states (levels) with different /, whereas NMR allows one to measure the transition... 

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